author | Mikael Laine <mikael.laine@ixonos.com> |
Fri, 29 Jan 2010 14:08:33 +0200 | |
changeset 0 | 951a5db380a0 |
permissions | -rw-r--r-- |
0
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Committing the Video Editor package under the Eclipse Public License
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/* |
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Committing the Video Editor package under the Eclipse Public License
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* Copyright (c) 2010 Ixonos Plc. |
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* All rights reserved. |
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Committing the Video Editor package under the Eclipse Public License
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* This component and the accompanying materials are made available |
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* under the terms of the "Eclipse Public License v1.0" |
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Committing the Video Editor package under the Eclipse Public License
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* which accompanies this distribution, and is available |
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Committing the Video Editor package under the Eclipse Public License
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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Committing the Video Editor package under the Eclipse Public License
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* Initial Contributors: |
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Committing the Video Editor package under the Eclipse Public License
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* Nokia Corporation - Initial contribution |
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Committing the Video Editor package under the Eclipse Public License
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* |
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* Contributors: |
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Committing the Video Editor package under the Eclipse Public License
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* Ixonos Plc |
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Committing the Video Editor package under the Eclipse Public License
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* |
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* Description: |
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Committing the Video Editor package under the Eclipse Public License
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* MPEG-4 sync code functions. |
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Committing the Video Editor package under the Eclipse Public License
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* |
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Committing the Video Editor package under the Eclipse Public License
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*/ |
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#include "h263dConfig.h" |
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|
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#include "sync.h" |
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#include "errcodes.h" |
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#include "debug.h" |
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Committing the Video Editor package under the Eclipse Public License
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#include "mpegcons.h" |
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#include "biblin.h" |
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/* |
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* Global functions |
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Committing the Video Editor package under the Eclipse Public License
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*/ |
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|
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/* {{-output"sncCheckMpegVOP.txt"}} */ |
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Committing the Video Editor package under the Eclipse Public License
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/* |
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Committing the Video Editor package under the Eclipse Public License
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* |
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Committing the Video Editor package under the Eclipse Public License
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* sncCheckMpegVOP |
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Committing the Video Editor package under the Eclipse Public License
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* |
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* Parameters: |
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Committing the Video Editor package under the Eclipse Public License
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* buffer a pointer to a bit buffer structure |
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Committing the Video Editor package under the Eclipse Public License
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* error error code |
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Committing the Video Editor package under the Eclipse Public License
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* |
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Committing the Video Editor package under the Eclipse Public License
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* Function: |
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Committing the Video Editor package under the Eclipse Public License
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* This function checks if the GOV, VOP start codes |
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Committing the Video Editor package under the Eclipse Public License
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* are the next codes in the bit buffer. |
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Committing the Video Editor package under the Eclipse Public License
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* NO stuffing is allowed before the code, the routine checks from the |
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Committing the Video Editor package under the Eclipse Public License
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* current position in the buffer- |
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Committing the Video Editor package under the Eclipse Public License
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* The code is not flushed from the buffer. |
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Committing the Video Editor package under the Eclipse Public License
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* |
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* Returns: |
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Committing the Video Editor package under the Eclipse Public License
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* SNC_NO_SYNC if no sync code is found |
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Committing the Video Editor package under the Eclipse Public License
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* SNC_PSC if GOV or VOP start code is found |
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Committing the Video Editor package under the Eclipse Public License
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* |
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* Error codes: |
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Committing the Video Editor package under the Eclipse Public License
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* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
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* |
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* |
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* |
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*/ |
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int sncCheckMpegVOP(bibBuffer_t *buffer, int16 *error) |
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/* {{-output"sncCheckMpegVOP.txt"}} */ |
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{ |
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u_int32 bits; |
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int16 newError = 0; |
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int numBitsGot, bitErrorIndication = 0; |
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|
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bits = bibShowBits(32, buffer, &numBitsGot, &bitErrorIndication, &newError); |
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|
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if ((newError == ERR_BIB_NOT_ENOUGH_DATA) && (numBitsGot > 0 )) { |
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/* Still bits in the buffer */ |
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deb("sncCheckSync: bibShowReturned not enough data but there are " |
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"still bits in the buffer --> error cleared.\n"); |
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return SNC_NO_SYNC; |
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} else if (newError) { |
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*error = newError; |
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return SNC_NO_SYNC; |
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} |
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if (bits == MP4_GROUP_START_CODE || bits == MP4_VOP_START_CODE || bits == MP4_EOB_CODE) |
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return SNC_PSC; |
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else |
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return SNC_NO_SYNC; |
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Committing the Video Editor package under the Eclipse Public License
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} |
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/* {{-output"sncCheckMpegSync.txt"}} */ |
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Committing the Video Editor package under the Eclipse Public License
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/* |
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* |
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* sncCheckMpegSync |
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* |
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* Parameters: |
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* buffer a pointer to a bit buffer structure |
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* f_code f_code of the last P-vop |
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* error error code |
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* |
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* Function: |
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* This function checks if the GOV, VOP or Video Pcaket start codes |
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* are the next codes in the bit buffer. |
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* Stuffing is needed before the code and the number of stuffing bits |
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* is returned in numStuffBits parameter. |
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* The code is not flushed from the buffer. |
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* |
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* Returns: |
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* SNC_NO_SYNC if no sync code is found |
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* SNC_GOV if GOV start code is found |
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* SNC_VOP if VOP start code is found |
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* SNC_VOS if VOS start code is found |
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* SNC_VIDPACK if Video Packet start code is found |
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* SNC_STUFFING if there is a bit with the value zero |
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* followed by less than 7 bits with the |
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* value one starting from the current position |
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* and after them the buffer (picture segment) ends |
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* |
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* Error codes: |
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* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
951a5db380a0
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* |
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* |
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* |
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* |
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120 |
* |
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* |
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122 |
*/ |
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123 |
|
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int sncCheckMpegSync(bibBuffer_t *buffer, int f_code, int16 *error) |
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/* {{-output"sncCheckMpegSync.txt"}} */ |
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126 |
{ |
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127 |
u_int32 result, bits, start_code_val; |
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128 |
int numBitsGot, i, shift_bits; |
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129 |
int16 newError = 0; |
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int bitErrorIndication = 0; |
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131 |
|
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132 |
shift_bits = 32-(16+f_code); |
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133 |
|
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134 |
bits = bibShowBits(32, buffer, &numBitsGot, &bitErrorIndication, &newError); |
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135 |
|
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136 |
if ( buffer->error ) |
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137 |
{ |
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138 |
// out of bits |
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139 |
*error = (int16)buffer->error; |
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140 |
return SNC_NO_SYNC; |
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141 |
} |
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142 |
|
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143 |
|
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144 |
for(i = 0; i <= 8; i++) { |
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145 |
|
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146 |
/* if stuffing is correct */ |
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147 |
if ( (i==0) || ((bits >> (32-i)) == (u_int32) ((1 << (i-1))-1)) ) { |
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148 |
|
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149 |
result = bits << i; |
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150 |
|
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151 |
if ((result >> 8) == 1) { |
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152 |
|
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153 |
/* Stuff start code */ |
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154 |
if (i != 0) { |
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155 |
bibFlushBits(i, buffer, &numBitsGot, &bitErrorIndication, &newError); |
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156 |
if (newError) { |
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157 |
*error = newError; |
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158 |
return SNC_NO_SYNC; |
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159 |
} |
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160 |
} |
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161 |
|
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162 |
/* Check start code */ |
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163 |
start_code_val = |
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164 |
bibShowBits(32, buffer, &numBitsGot, &bitErrorIndication, &newError); |
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165 |
if ((newError == ERR_BIB_NOT_ENOUGH_DATA) && (numBitsGot > 0 )) { |
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166 |
/* Still bits in the buffer */ |
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167 |
deb("sncCheckSync: bibShowReturned not enough data but there are " |
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168 |
"still bits in the buffer --> error cleared.\n"); |
951a5db380a0
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169 |
if (i) bibRewindBits(i, buffer, &newError); |
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170 |
return SNC_NO_SYNC; |
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Committing the Video Editor package under the Eclipse Public License
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171 |
} else if (newError) { |
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172 |
*error = newError; |
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Committing the Video Editor package under the Eclipse Public License
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173 |
if (i) bibRewindBits(i, buffer, &newError); |
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Committing the Video Editor package under the Eclipse Public License
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174 |
return SNC_NO_SYNC; |
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Committing the Video Editor package under the Eclipse Public License
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175 |
} |
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176 |
|
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177 |
if (start_code_val == MP4_VOP_START_CODE) { |
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Committing the Video Editor package under the Eclipse Public License
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178 |
return SNC_VOP; |
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Committing the Video Editor package under the Eclipse Public License
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179 |
} else if (start_code_val == MP4_VOS_START_CODE) { |
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180 |
return SNC_VOS; |
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Committing the Video Editor package under the Eclipse Public License
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181 |
} else if (start_code_val == MP4_GROUP_START_CODE) { |
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Committing the Video Editor package under the Eclipse Public License
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182 |
return SNC_GOV; |
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Committing the Video Editor package under the Eclipse Public License
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183 |
} else if (start_code_val == MP4_USER_DATA_START_CODE) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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184 |
return SNC_USERDATA; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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185 |
} else if (start_code_val == MP4_EOB_CODE) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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186 |
return SNC_EOB; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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187 |
} else if (((start_code_val >> (32-MP4_VID_START_CODE_LENGTH)) == MP4_VID_START_CODE) || |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
188 |
((start_code_val >> (32-MP4_VOL_START_CODE_LENGTH)) == MP4_VOL_START_CODE)) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
189 |
return SNC_VID; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
190 |
} else { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
191 |
if (i) bibRewindBits(i, buffer, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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192 |
continue; |
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Committing the Video Editor package under the Eclipse Public License
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|
193 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
194 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
195 |
} else if (f_code && ((result >> shift_bits) == 1)) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
196 |
if (i != 0) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
197 |
/* Stuff start code */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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198 |
bibFlushBits(i, buffer, &numBitsGot, &bitErrorIndication, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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199 |
if (newError) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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200 |
*error = newError; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
201 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
202 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
203 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
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|
204 |
return SNC_VIDPACK; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
205 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
206 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
207 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
208 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
209 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
210 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
211 |
|
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Committing the Video Editor package under the Eclipse Public License
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|
212 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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213 |
/* {{-output"sncRewindAndSeekNewMPEGSync.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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214 |
/* |
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Committing the Video Editor package under the Eclipse Public License
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|
215 |
* sncRewindAndSeekNewMPEGSync |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
216 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
217 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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218 |
* Parameters: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
219 |
* numBitsToRewind the number of bits to rewind before seeking |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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220 |
* the synchronization code, |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
221 |
* if negative, a default number of bits is |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
222 |
* rewinded. It is recommended to use |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
223 |
* the SNC_DEFAULT_REWIND definition to represent |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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parents:
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|
224 |
* negative values in order to increase code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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parents:
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|
225 |
* readability. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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parents:
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|
226 |
* buffer a pointer to a bit buffer structure |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
227 |
* f_code f_code of the last P-vop |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
228 |
* error error code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
229 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
230 |
* Function: |
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* This function is intended to be called after bit error detection. |
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* It rewinds some (already read) bits in order not to miss any sync code. |
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* Then, this function finds the next GOV, VOP or Video Packet start code |
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* which is not within the rewinded bits. The function discards the bits |
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* before the synchronization code but does not remove the found code from |
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* the buffer. |
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* |
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* |
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* Returns: |
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* SNC_NO_SYNC if no sync code was found and |
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* no more bits are available |
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* SNC_GOV if GOV start code is found |
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* SNC_VOP if VOP start code is found |
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* SNC_VIDPACK if Video Packet start code is found |
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* |
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* Error codes: |
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247 |
* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
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* |
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* |
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* |
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*/ |
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|
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int sncRewindAndSeekNewMPEGSync(int numBitsToRewind, bibBuffer_t *buffer, |
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int f_code, int16 *error) |
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/* {{-output"sncRewindAndSeekNewMPEGSync.txt"}} */ |
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{ |
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int sncCode; /* found sync code */ |
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258 |
u_int32 numRewindableBits; /* number of bits which can be rewinded */ |
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u_int32 bitPosBeforeRewinding; /* initial buffer bit index */ |
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u_int32 syncStartBitPos; /* 1st bit index in found sync code */ |
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u_int32 syncEndBitPos; |
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int nb = 0; |
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int bei = 0; |
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|
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*error = 0; |
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|
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/* If default number of rewinded bits requested */ |
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if (numBitsToRewind < 0) |
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/* 32 bits is considered to be enough */ |
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numBitsToRewind = 32; |
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|
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numRewindableBits = bibNumberOfRewBits(buffer); |
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|
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if (numRewindableBits < (u_int32) numBitsToRewind) |
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numBitsToRewind = (int) numRewindableBits; |
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|
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bitPosBeforeRewinding = bibNumberOfFlushedBits(buffer); |
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|
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if (numBitsToRewind) bibRewindBits(numBitsToRewind, buffer, error); |
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if (*error) |
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return SNC_NO_SYNC; |
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|
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/* Loop */ |
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do { |
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|
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/* Seek the next synchronization code */ |
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sncCode = sncSeekMPEGStartCode (buffer, f_code, 0 /* this method used with DP and VP => VP resync is relevant */, 0, error); |
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if (*error) |
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return sncCode; |
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|
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syncStartBitPos = bibNumberOfFlushedBits(buffer); |
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|
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syncEndBitPos = syncStartBitPos + |
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(u_int32) ((sncCode == SNC_VIDPACK) ? (16 + f_code) : 32); |
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|
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if (syncEndBitPos <= bitPosBeforeRewinding) |
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bibFlushBits( 1, buffer, &nb, &bei, error ); |
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|
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/* While the found sync code has been previously read */ |
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} while (syncEndBitPos <= bitPosBeforeRewinding); |
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|
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302 |
return sncCode; |
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Committing the Video Editor package under the Eclipse Public License
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} |
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Committing the Video Editor package under the Eclipse Public License
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|
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Committing the Video Editor package under the Eclipse Public License
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/* {{-output"sncSeekMPEGSync.txt"}} */ |
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Committing the Video Editor package under the Eclipse Public License
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/* |
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Committing the Video Editor package under the Eclipse Public License
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307 |
* sncSeekMPEGSync |
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Committing the Video Editor package under the Eclipse Public License
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* |
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Committing the Video Editor package under the Eclipse Public License
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309 |
* |
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310 |
* Parameters: |
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Committing the Video Editor package under the Eclipse Public License
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311 |
* buffer a pointer to a bit buffer structure |
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Committing the Video Editor package under the Eclipse Public License
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312 |
* f_code f_code of the last P-vop |
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Committing the Video Editor package under the Eclipse Public License
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313 |
* error error code |
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Committing the Video Editor package under the Eclipse Public License
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* |
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Committing the Video Editor package under the Eclipse Public License
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315 |
* Function: |
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Committing the Video Editor package under the Eclipse Public License
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316 |
* Then, this function finds the next GOV, VOP or Video Packet start code |
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Committing the Video Editor package under the Eclipse Public License
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317 |
* from the buffer. The function discards the bits before the sync code |
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Committing the Video Editor package under the Eclipse Public License
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318 |
* but does not remove the found code from the buffer. |
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Committing the Video Editor package under the Eclipse Public License
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319 |
* |
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Committing the Video Editor package under the Eclipse Public License
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320 |
* Returns: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
321 |
* SNC_NO_SYNC if no sync code was found and |
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Committing the Video Editor package under the Eclipse Public License
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322 |
* no more bits are available |
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323 |
* SNC_GOV if GOV start code is found |
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Committing the Video Editor package under the Eclipse Public License
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324 |
* SNC_VOP if VOP start code is found |
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Committing the Video Editor package under the Eclipse Public License
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325 |
* SNC_VOS if VOS start code is found |
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Committing the Video Editor package under the Eclipse Public License
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326 |
* SNC_VIDPACK if Video Packet start code is found |
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Committing the Video Editor package under the Eclipse Public License
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327 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
328 |
* Error codes: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
329 |
* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
330 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
331 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
332 |
*/ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
333 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
334 |
int sncSeekMPEGSync(bibBuffer_t *buffer, int f_code, int16 *error) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
335 |
/* {{-output"sncSeekMPEGSync.txt"}} */ |
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Committing the Video Editor package under the Eclipse Public License
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336 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
337 |
u_int32 result; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
338 |
int numBitsGot, shift_bits; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
339 |
int16 newError = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
340 |
int bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
341 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
342 |
shift_bits = 32-(16+f_code); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
343 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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|
344 |
for (;;) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
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changeset
|
345 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
346 |
bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
347 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
348 |
result = bibShowBits(32, buffer, &numBitsGot, &bitErrorIndication, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
349 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
350 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
351 |
if (newError == ERR_BIB_NOT_ENOUGH_DATA && numBitsGot) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
352 |
/* Use the available bits */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
353 |
result <<= (32 - numBitsGot); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
354 |
newError = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
355 |
} else if (newError) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
356 |
deb("sncSeekSync: ERROR - bibShowBits failed.\n"); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
357 |
*error = newError; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
358 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
359 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
360 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
361 |
if (result == MP4_GROUP_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
362 |
return SNC_GOV; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
363 |
else if (result == MP4_VOP_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
364 |
return SNC_VOP; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
365 |
else if (result == MP4_VOS_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
366 |
return SNC_VOS; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
367 |
else if (result == MP4_EOB_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
368 |
return SNC_EOB; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
369 |
else if (f_code && ((result >> shift_bits) == 1)) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
370 |
return SNC_VIDPACK; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
371 |
else if ( buffer->error ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
372 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
373 |
// out of bits |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
374 |
*error = (int16)buffer->error; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
375 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
376 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
377 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
378 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
379 |
bibFlushBits(1, buffer, &numBitsGot, &bitErrorIndication, error); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
380 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
381 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
382 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
383 |
/* {{-output"sncSeekMPEGStartCode.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
384 |
/* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
385 |
* sncSeekMPEGStartCode |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
386 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
387 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
388 |
* Parameters: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
389 |
* buffer a pointer to a bit buffer structure |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
390 |
* f_code f_code of the last P-vop |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
391 |
* skipVPSync nonzero if Video Packet sync codes can be skipped |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
392 |
* error error code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
393 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
394 |
* Function: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
395 |
* This function finds the next GOV, VOP or Video Packet start code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
396 |
* from the buffer in byte-aligned positions. The function discards the bits before the sync code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
397 |
* but does not remove the found code from the buffer. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
398 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
399 |
* Returns: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
400 |
* SNC_NO_SYNC if no sync code was found and |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
401 |
* no more bits are available |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
402 |
* SNC_GOV if GOV start code is found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
403 |
* SNC_VOP if VOP start code is found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
404 |
* SNC_VOS if VOS start code is found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
405 |
* SNC_VIDPACK if Video Packet start code is found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
406 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
407 |
* Error codes: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
408 |
* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
409 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
410 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
411 |
*/ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
412 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
413 |
int sncSeekMPEGStartCode(bibBuffer_t *buffer, int f_code, int skipVPSync, int checkUD, int16 *error) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
414 |
/* {{-output"sncSeekMPEGSync.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
415 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
416 |
u_int32 result; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
417 |
int numBitsGot, shift_bits; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
418 |
int16 newError = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
419 |
int bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
420 |
int flush = 8; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
421 |
const u_int32 MAX_MPEG4_START_CODE = 0x000001ff; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
422 |
shift_bits = 32-(16+f_code); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
423 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
424 |
/* start codes are always byte aligned */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
425 |
/* move to the next byte aligned position, if not already there */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
426 |
if (buffer->bitIndex != 7) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
427 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
428 |
bibForwardBits(buffer->bitIndex + 1, buffer); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
429 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
430 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
431 |
for (;;) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
432 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
433 |
bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
434 |
result = bibShowBits(32, buffer, &numBitsGot, &bitErrorIndication, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
435 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
436 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
437 |
if ( buffer->error ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
438 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
439 |
// out of bits |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
440 |
*error = (int16)buffer->error; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
441 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
442 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
443 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
444 |
/* don't check all start codes, if it is not one of them */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
445 |
if (result <= MAX_MPEG4_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
446 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
447 |
if (result == MP4_GROUP_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
448 |
return SNC_GOV; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
449 |
else if (result == MP4_VOP_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
450 |
return SNC_VOP; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
451 |
else if (result == MP4_VOS_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
452 |
return SNC_VOS; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
453 |
else if (result == MP4_EOB_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
454 |
return SNC_EOB; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
455 |
else if ( checkUD && (result == MP4_USER_DATA_START_CODE) ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
456 |
return SNC_USERDATA; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
457 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
458 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
459 |
else if (!skipVPSync && f_code && ((result >> shift_bits) == 1)) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
460 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
461 |
return SNC_VIDPACK; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
462 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
463 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
464 |
// we continue here after either if all the if-else's inside the if above are false or if the last else-if is false |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
465 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
466 |
// Note! the following optimization is based on MPEG-4 sync code prefix 0x000001. It doesn't work with any other prefixes. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
467 |
if ( !skipVPSync ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
468 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
469 |
flush = 8; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
470 |
// a small optimization could be reached also with video packet sync markers, but is probably not worth the effort since |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
471 |
// it seems that it could be used to shift at most 16 bits at least in cases with typical f_code values |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
472 |
// idea: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
473 |
// at least if fcode == 15, possible vp resync markers are in the form |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
474 |
// 00008xxx, 00009xxx, 0000axxx, 0000bxxx, 0000cxxx, 0000dxxx, 0000exxx, 0000fxxx |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
475 |
// the shifting above already removes the 15 lowest bits => 16th bit must be 1 and 16 highest bits |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
476 |
// should be 0 |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
477 |
// in the old way, the sync code from 00008xxx is found in the following steps |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
478 |
// 8xxxyyyy, 008xxxyy, => match |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
479 |
// hence we can skip 16 bits (or f-code dependent nr of bits) if |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
480 |
// a) 32nd bit is 1 |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
481 |
// If 32nd bit is 0, we can skip the 16-(nr of successive 0-MSB bits) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
482 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
483 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
484 |
// then check for the other sync codes |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
485 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
486 |
// the 1st check here is needed to optimize the checking: in hopeless cases only a single check is needed |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
487 |
else if ( (result & 0x000000ff) <= 1 ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
488 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
489 |
// the 1st check is needed to optimize the checking: in hopeless cases only a single check is needed |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
490 |
if ( ((result & 0x000000ff ) == 1) && ((result & 0x00ffff00 ) > 0)) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
491 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
492 |
// yyxxxx01, where one of the x != 0 => hopeless |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
493 |
flush = 32; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
494 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
495 |
else if ( (result & 0x0000ffff ) == 0 ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
496 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
497 |
// xxxx0000 => could be the 1st 2 bytes of sync code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
498 |
flush = 16; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
499 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
500 |
else if ( (result & 0x000000ff) == 0 ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
501 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
502 |
// yyyyxx00, where xx != 00 (checked above), could be the 1st byte of sync code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
503 |
flush = 24; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
504 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
505 |
else if ( (result & 0x00ffffff) == 1 ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
506 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
507 |
// xx000001 => shift 1 byte |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
508 |
flush = 8; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
509 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
510 |
else |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
511 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
512 |
// this looks duplicate to the 1st one, but is kept here for simplicity. The 1st one is there since it is the most probable and |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
513 |
// hence most cases fall under it. If it was not there, then in most cases all the if's were evaluated and that means extra processing |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
514 |
flush = 32; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
515 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
516 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
517 |
else |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
518 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
519 |
// hopeless |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
520 |
flush = 32; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
521 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
522 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
523 |
// flush bits |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
524 |
bibFlushBits(flush, buffer, &numBitsGot, &bitErrorIndication, error); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
525 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
526 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
527 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
528 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
529 |
/* {{-output"sncSeekBitPattern.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
530 |
/* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
531 |
* sncSeekBitPattern |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
532 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
533 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
534 |
* Parameters: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
535 |
* buffer a pointer to a bit buffer structure |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
536 |
* error error code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
537 |
* BitPattern to bit pattern to be found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
538 |
* BitPatternLength length of the bit pattern to be found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
539 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
540 |
* Function: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
541 |
* This function finds the next occurance of the given BitPattern |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
542 |
* from the buffer. The function discards the bits before the BitPattern |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
543 |
* but does not remove the found code from the buffer. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
544 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
545 |
* Returns: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
546 |
* SNC_NO_SYNC if the bit pattern was not found and |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
547 |
* no more bits are available |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
548 |
* SNC_PATTERN if the BitPattern is found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
549 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
550 |
* Error codes: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
551 |
* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
552 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
553 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
554 |
*/ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
555 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
556 |
int sncSeekBitPattern(bibBuffer_t *buffer, u_int32 BitPattern, int BitPatternLength, int16 *error) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
557 |
/* {{-output"sncSeekBitPattern.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
558 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
559 |
u_int32 result; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
560 |
int numBitsGot; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
561 |
int16 newError = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
562 |
int bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
563 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
564 |
for (;;) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
565 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
566 |
bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
567 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
568 |
result = bibShowBits(32, buffer, &numBitsGot, &bitErrorIndication, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
569 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
570 |
if (newError == ERR_BIB_NOT_ENOUGH_DATA && numBitsGot >= BitPatternLength) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
571 |
/* Use the available bits */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
572 |
result <<= (32 - numBitsGot); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
573 |
newError = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
574 |
} else if (newError) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
575 |
deb("sncSeekBitPattern: ERROR - bibShowBits failed.\n"); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
576 |
*error = newError; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
577 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
578 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
579 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
580 |
if ((result >> (32 - BitPatternLength)) == BitPattern) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
581 |
return SNC_PATTERN; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
582 |
else if (result == MP4_GROUP_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
583 |
return SNC_GOV; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
584 |
else if (result == MP4_VOP_START_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
585 |
return SNC_VOP; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
586 |
else if (result == MP4_EOB_CODE) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
587 |
return SNC_EOB; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
588 |
else if ( buffer->error ) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
589 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
590 |
// out of bits |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
591 |
*error = (int16)buffer->error; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
592 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
593 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
594 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
595 |
bibFlushBits(1, buffer, &numBitsGot, &bitErrorIndication, error); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
596 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
597 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
598 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
599 |
/* {{-output"sncRewindStuffing.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
600 |
/* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
601 |
* sncRewindStuffing |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
602 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
603 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
604 |
* Parameters: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
605 |
* buffer a pointer to a bit buffer structure |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
606 |
* error error code |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
607 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
608 |
* Function: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
609 |
* This function recognizes and rewinds the stuffing bits (1..8) from |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
610 |
* the current position of the buffer. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
611 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
612 |
* Returns: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
613 |
* SNC_NO_SYNC if the stuffing was not found |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
614 |
* SNC_PATTERN if the stuffing has been rewinded successfully |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
615 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
616 |
* Error codes: |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
617 |
* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
618 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
619 |
* |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
620 |
*/ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
621 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
622 |
int sncRewindStuffing(bibBuffer_t *buffer, int16 *error) |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
623 |
/* {{-output"sncRewindStuffing.txt"}} */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
624 |
{ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
625 |
u_int32 result; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
626 |
int numBitsGot, i; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
627 |
int16 newError = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
628 |
int bitErrorIndication = 0; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
629 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
630 |
bibRewindBits(8, buffer, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
631 |
result = bibGetBits(8, buffer, &numBitsGot, &bitErrorIndication, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
632 |
if (newError) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
633 |
deb("sncRewindStuffing: ERROR - bibShowBits failed.\n"); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
634 |
*error = newError; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
635 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
636 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
637 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
638 |
for(i = 1; i <= 8; i++) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
639 |
/* if stuffing is correct */ |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
640 |
if ((result & (1 << (i-1))) == 0) { |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
641 |
bibRewindBits(i, buffer, &newError); |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
642 |
return SNC_PATTERN; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
643 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
644 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
645 |
|
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
646 |
return SNC_NO_SYNC; |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
647 |
} |
951a5db380a0
Committing the Video Editor package under the Eclipse Public License
Mikael Laine <mikael.laine@ixonos.com>
parents:
diff
changeset
|
648 |
// End of File |