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1 /* |
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2 * Copyright (c) 2010 Ixonos Plc. |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - Initial contribution |
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11 * |
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12 * Contributors: |
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13 * Ixonos Plc |
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14 * |
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15 * Description: |
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16 * |
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17 */ |
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18 |
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19 |
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20 #ifndef MP3_DEF_H_ |
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21 #define MP3_DEF_H_ |
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22 |
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23 /*- Project Headers. --*/ |
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24 #include "defines.h" |
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25 |
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26 /************************************************************************** |
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27 External Objects Provided |
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28 *************************************************************************/ |
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29 |
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30 /*-- General MPx Definitions. --*/ |
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31 #ifndef PI |
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32 #define PI (3.14159265358979) |
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33 #endif |
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34 #define MPEG_AUDIO_ID (1) |
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35 #define MPEG_PHASE2_LSF (0) |
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36 #define SBLIMIT (32) |
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37 #define SSLIMIT (18) |
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38 #define MAX_MONO_SAMPLES (SBLIMIT * SSLIMIT) |
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39 #define HAN_SIZE (512) |
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40 #define NUM_SUBWIN (16) |
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41 #define SCALE (32768L) |
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42 #define SYNC_WORD ((long) 0x7ff) |
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43 #define SYNC_WORD_LENGTH (11) |
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44 #define HEADER_BITS (20) |
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45 #define MAX_LONG_SFB_BANDS (22) |
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46 #define MAX_SHORT_SFB_BANDS (13) |
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47 #define MIN_MP3FRAMELEN (1440) |
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48 #define MAX_BITRESER_SIZE (512) |
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49 #define CRC_MAX_PAYLOAD (34) |
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50 |
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51 /*-- MPEG Header Definitions - Mode Values --*/ |
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52 #define MPG_MD_STEREO (0) |
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53 #define MPG_MD_JOINT_STEREO (1) |
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54 #define MPG_MD_DUAL_CHANNEL (2) |
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55 #define MPG_MD_MONO (3) |
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56 |
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57 /*-- Some Useful Macros. --*/ |
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58 #ifdef MIN |
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59 #undef MIN |
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60 #endif |
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61 #define MIN(A, B) ((A) < (B) ? (A) : (B)) |
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62 |
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63 #ifdef MAX |
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64 #undef MAX |
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65 #endif |
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66 #define MAX(A, B) ((A) > (B) ? (A) : (B)) |
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67 |
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68 /*-- Channel definitions. --*/ |
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69 #define MONO_CHAN (0) |
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70 //#define MAX_CHANNELS (2) |
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71 #define LEFT_CHANNEL (MONO_CHAN) |
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72 #define RIGHT_CHANNEL (MONO_CHAN + 1) |
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73 |
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74 /* |
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75 Purpose: Masks those bit fields from the header to zero that |
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76 do not remain fixed from frame to frame. |
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77 Explanation: Following fields are assumed to be fixed : |
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78 * 12th bit from the sync word |
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79 * version |
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80 * layer description |
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81 * sampling rate |
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82 * channel mode (layer 3 only) |
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83 * copyright bit |
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84 * original bit |
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85 * de-emphasis |
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86 |
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87 Following fields can vary from frame to frame : |
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88 * protection bit |
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89 * bit rate |
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90 * padding bit |
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91 * private bit |
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92 * channel mode extension |
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93 */ |
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94 #define HEADER_MASK(header) ((uint32)header & 0x001E0CCF) |
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95 |
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96 /* |
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97 Purpose: Macro to extract layer description. |
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98 Explanation: This is the bit value, use MP_Header::layer_number method |
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99 to interpret this value. */ |
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100 #define LAYER_MASK(header) (((uint32)header >> 17) & 3) |
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101 |
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102 /* |
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103 Purpose: Layer III flags. |
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104 Explanation: - */ |
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105 typedef enum LayerIIIFlags |
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106 { |
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107 WINDOW_SWITCHING_FLAG = 4, |
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108 MIXED_BLOCK_FLAG = 8, |
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109 PRE_FLAG = 16, |
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110 SCALEFAC_SCALE = 32, |
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111 COUNT_1_TABLE_SELECT = 64 |
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112 |
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113 } Layer_III_Flags; |
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114 |
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115 /* |
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116 Purpose: Stereo modes for layer III. |
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117 Explanation: - */ |
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118 typedef enum StereoMode |
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119 { |
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120 ONLY_MONO, |
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121 ONLY_STEREO, |
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122 MS_STEREO, |
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123 IS_STEREO, |
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124 LSF_IS_STEREO |
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125 |
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126 } StereoMode; |
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127 |
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128 /* |
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129 Purpose: Block types for layer III. |
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130 Explanation: The first four describe the actual block type for each subband, |
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131 the rest of the declarations describe the block type for the |
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132 whole frame. */ |
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133 |
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134 typedef enum MP3_WINDOW_TYPE |
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135 { |
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136 ONLY_LONG_WINDOW, |
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137 LONG_SHORT_WINDOW, |
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138 ONLY_SHORT_WINDOW, |
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139 SHORT_LONG_WINDOW, |
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140 MIXED_BLOCK_MODE, |
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141 SHORT_BLOCK_MODE, |
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142 LONG_BLOCK_MODE |
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143 |
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144 } MP3_WINDOW_TYPE, MP3WindowType; |
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145 |
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146 /* |
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147 Purpose: Structure to hold scalefactor band parameters. |
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148 Explanation: - */ |
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149 typedef struct SFBAND_DATA_STR |
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150 { |
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151 int16 l[23]; /* long block. */ |
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152 int16 s[14]; /* short block. */ |
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153 |
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154 } SFBAND_DATA; |
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155 |
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156 /* |
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157 Purpose: Number of bits reserved for decoding each group |
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158 of scalefactors. |
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159 Explanation: - */ |
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160 typedef struct SFBITS_DATA_STR |
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161 { |
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162 int16 l[5]; |
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163 int16 s[3]; |
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164 |
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165 } SFBITS_DATA; |
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166 |
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167 /* |
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168 Purpose: Sync seek code. |
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169 Explanation: - */ |
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170 typedef enum MIX_SYNC_STATUS |
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171 { |
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172 LAYER1_STREAM_MIX, |
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173 LAYER2_STREAM_MIX, |
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174 LAYER3_STREAM_MIX, |
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175 FIRST_FRAME_WITH_LAYER1, |
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176 FIRST_FRAME_WITH_LAYER2, |
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177 FIRST_FRAME_WITH_LAYER3 |
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178 |
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179 } MIX_SYNC_STATUS; |
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180 |
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181 #endif /* MP3_DEF_H_ */ |