author | Mikael Laine <mikael.laine@ixonos.com> |
Fri, 29 Jan 2010 14:08:33 +0200 | |
changeset 0 | 951a5db380a0 |
permissions | -rw-r--r-- |
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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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* 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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* 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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* Initial Contributors: |
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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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* 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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* H.263 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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*/ |
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#include "h263dConfig.h" |
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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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#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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/* {{-output"sncCheckSync.txt"}} */ |
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Committing the Video Editor package under the Eclipse Public License
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/* |
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* sncCheckSync |
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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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Committing the Video Editor package under the Eclipse Public License
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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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* numStuffBits the number of stuffing bits |
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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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* Function: |
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Committing the Video Editor package under the Eclipse Public License
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* This function checks if the Picture Start Code (PSC), |
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* the End Of Sequence code (EOS) or the GOB synchronization code (GBSC) |
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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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* Stuffing (PSTUF, ESTUF or GSTUF) is allowed before the code and |
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* the number of stuffing bits is returned in numStuffBits parameter. |
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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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* SNC_PSC if PSC is found |
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* SNC_GBSC if GBSC is found |
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* SNC_EOS if EOS is found |
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* SNC_STUFFING if there are less than 8 zeros starting from |
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Committing the Video Editor package under the Eclipse Public License
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* the current position and after |
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* them the buffer ends |
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* |
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* Error codes: |
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* Error codes returned by bibFlushBits/bibGetBits/bibShowBits. |
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* |
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*/ |
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int sncCheckSync(bibBuffer_t *buffer, int *numStuffBits, int16 *error) |
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/* {{-output"sncCheckSync.txt"}} */ |
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{ |
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u_int32 result; |
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int numBitsGot, i; |
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int16 newError = 0; |
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int bitErrorIndication = 0; |
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|
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for(i = 0; i < 8; i++) { |
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bitErrorIndication = 0; |
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result = bibShowBits(i + 22, buffer, &numBitsGot, &bitErrorIndication, |
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&newError); |
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if (result == 32) { |
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/* PSC */ |
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*numStuffBits = i; |
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return SNC_PSC; |
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} |
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|
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else if (result == 63) { |
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/* EOS */ |
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*numStuffBits = i; |
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return SNC_EOS; |
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} |
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|
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else if (result > 32 && result < 63) { |
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/* GBSC */ |
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/* Notice that the allowed Group Numbers are listed in section 5.2.3 |
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of the H.263 recommendation. They are not checked here but rather |
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they are assumed to be checked in the corresponding header reading |
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function, e.g. vdxGetGOBHeader. */ |
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*numStuffBits = i; |
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return SNC_GBSC; |
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} |
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|
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else if (result >= 64) { |
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return SNC_NO_SYNC; |
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} |
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else if ( buffer->error ) |
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{ |
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// out of bits |
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*error = (int16)buffer->error; |
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return SNC_NO_SYNC; |
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} |
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} |
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return SNC_NO_SYNC; |
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} |
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/* {{-output"sncRewindAndSeekNewSync.txt"}} */ |
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/* |
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* sncRewindAndSeekNewSync |
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* |
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* |
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* Parameters: |
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* earliestBitPos location of previously found sync code |
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* so no sense to rewind over it |
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* buffer a pointer to a bit buffer structure |
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* error error code |
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* |
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* Function: |
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* This function is intended to be called after GOB header is corrupted. |
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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 Picture Start Code (PSC), |
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* End Of Sequence code (EOS) or Group of Blocks Start Code (GBSC) |
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* The function discards the bits before the synchronization code |
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* but does not remove the found code from the buffer. |
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* |
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* Returns: |
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* SNC_NO_SYNC if no PSC, EOS either GBSC was found and |
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* no more bits are available |
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* SNC_PSC if PSC is found |
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* SNC_GBSC if GBSC is found |
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* SNC_EOS if EOS is found |
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* |
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* Error codes: |
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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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int sncRewindAndSeekNewSync(u_int32 earliestBitPos, bibBuffer_t *buffer, |
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int16 *error) |
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/* {{-output"sncRewindAndSeekNewSync.txt"}} */ |
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{ |
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int sncCode; /* found sync code */ |
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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 numBitsToRewind; /* number of bits to rewind before seeking the sync code */ |
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|
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*error = 0; |
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|
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bitPosBeforeRewinding = bibNumberOfFlushedBits(buffer); |
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|
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if ( bitPosBeforeRewinding > earliestBitPos+17 ) { |
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numBitsToRewind = bitPosBeforeRewinding - earliestBitPos - 17; |
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/* 17 is the sync code length, and one sync code exists in earliestBitPos => do not read it again */ |
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} |
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else if ( bitPosBeforeRewinding > earliestBitPos ) { |
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/* This might be possible in slice mode */ |
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numBitsToRewind = bitPosBeforeRewinding - earliestBitPos; |
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} |
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else { |
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/* Bit counter overrun? */ |
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numBitsToRewind = bitPosBeforeRewinding + (0xffffffff - earliestBitPos) - 17; |
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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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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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/* Seek the next synchronization code */ |
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sncCode = sncSeekSync(buffer, error); |
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if (*error) |
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return sncCode; |
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|
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return sncCode; |
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} |
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|
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|
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/* {{-output"sncSeekFrameSync.txt"}} */ |
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/* |
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Committing the Video Editor package under the Eclipse Public License
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* sncSeekFrameSync |
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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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* Parameters: |
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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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201 |
* This function finds the next Picture Start Code (PSC) or |
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Committing the Video Editor package under the Eclipse Public License
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* End Of Sequence code (EOS) from the bit buffer. The function skips |
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* any other codes. It discards the bits before the found synchronization |
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Committing the Video Editor package under the Eclipse Public License
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* code 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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* |
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Committing the Video Editor package under the Eclipse Public License
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* Returns: |
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Committing the Video Editor package under the Eclipse Public License
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207 |
* SNC_NO_SYNC if no PSC or EOS was found and |
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* no more bits are available |
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209 |
* SNC_PSC if PSC is found |
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* SNC_EOS if EOS is found |
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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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212 |
* 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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Committing the Video Editor package under the Eclipse Public License
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|
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int sncSeekFrameSync(bibBuffer_t *buffer, int16 *error) |
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/* {{-output"sncSeekFrameSync.txt"}} */ |
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{ |
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int numBitsGot, syncCode, bitErrorIndication = 0; |
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int16 newError = 0; |
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|
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223 |
for (;;) { |
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syncCode = sncSeekSync(buffer, &newError); |
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225 |
|
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226 |
if (newError) { |
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*error = newError; |
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return SNC_NO_SYNC; |
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229 |
} |
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Committing the Video Editor package under the Eclipse Public License
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|
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231 |
if (syncCode == SNC_GBSC) { |
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bibFlushBits(17, buffer, &numBitsGot, &bitErrorIndication, &newError); |
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} |
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|
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else |
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return syncCode; |
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} |
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} |
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|
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|
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/* {{-output"sncSeekSync.txt"}} */ |
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/* |
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* sncSeekSync |
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* |
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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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* error error code |
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* |
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* Function: |
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* This function finds the next Picture Start Code (PSC), |
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* End Of Sequence code (EOS) or Group of Blocks Start Code (GBSC) |
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* from the bit buffer. It discards the bits before the synchronization |
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* code but does not remove the found code from the buffer. |
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* |
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* Returns: |
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* SNC_NO_SYNC if no PSC, EOS either GBSC was found and |
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* no more bits are available |
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* SNC_PSC if PSC is found |
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* SNC_GBSC if GBSC is found |
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* SNC_EOS if EOS is found |
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* |
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* Error codes: |
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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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int sncSeekSync(bibBuffer_t *buffer, int16 *error) |
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/* {{-output"sncSeekSync.txt"}} */ |
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{ |
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u_int32 result; |
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int numBitsGot; |
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int16 newError = 0; |
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int bitErrorIndication = 0; |
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|
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for (;;) { |
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bitErrorIndication = 0; |
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result = bibShowBits(22, buffer, &numBitsGot, &bitErrorIndication, |
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&newError); |
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|
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|
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if (result == 32) { |
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/* PSC */ |
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return SNC_PSC; |
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} |
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|
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else if (result == 63) { |
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/* EOS */ |
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return SNC_EOS; |
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} |
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|
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else if (result > 32 && result < 63) { |
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/* GBSC */ |
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/* Notice that the allowed Group Numbers are listed in section 5.2.3 |
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of the H.263 recommendation. They are not checked here but rather |
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they are assumed to be checked in the corresponding header reading |
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function, e.g. vdxGetGOBHeader. */ |
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return SNC_GBSC; |
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} |
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else if ( buffer->error ) |
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{ |
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// out of bits |
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*error = (int16)buffer->error; |
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return SNC_NO_SYNC; |
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} |
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|
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bibFlushBits(1, buffer, &numBitsGot, &bitErrorIndication, error); |
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} |
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} |
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|
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// End of file |