libavcodec/mpeg4audio.h

   1 /*
   2  * MPEG-4 Audio common header
   3  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef AVCODEC_MPEG4AUDIO_H
  23 #define AVCODEC_MPEG4AUDIO_H
  24
  25 #include <stdint.h>
  26
  27 #include "libavutil/attributes.h"
  28
  29 #include "get_bits.h"
  30 #include "internal.h"
  31 #include "put_bits.h"
  32
  33 typedef struct MPEG4AudioConfig {
  34     int object_type;
  35     int sampling_index;
  36     int sample_rate;
  37     int chan_config;
  38     int sbr; ///< -1 implicit, 1 presence
  39     int ext_object_type;
  40     int ext_sampling_index;
  41     int ext_sample_rate;
  42     int ext_chan_config;
  43     int channels;
  44     int ps;  ///< -1 implicit, 1 presence
  45     int frame_length_short;
  46 } MPEG4AudioConfig;
  47
  48 extern av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16];
  49 extern const uint8_t ff_mpeg4audio_channels[8];
  50
  51 /**
  52  * Parse MPEG-4 systems extradata to retrieve audio configuration.
  53  * @param[in] c        MPEG4AudioConfig structure to fill.
  54  * @param[in] buf      Extradata from container.
  55  * @param[in] bit_size Extradata size in bits.
  56  * @param[in] sync_extension look for a sync extension after config if true.
  57  * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
  58  */
  59 int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
  60                                  int bit_size, int sync_extension);
  61
  62 enum AudioObjectType {
  63     AOT_NULL,
  64                                // Support?                Name
  65     AOT_AAC_MAIN,              ///< Y                       Main
  66     AOT_AAC_LC,                ///< Y                       Low Complexity
  67     AOT_AAC_SSR,               ///< N (code in SoC repo)    Scalable Sample Rate
  68     AOT_AAC_LTP,               ///< Y                       Long Term Prediction
  69     AOT_SBR,                   ///< Y                       Spectral Band Replication
  70     AOT_AAC_SCALABLE,          ///< N                       Scalable
  71     AOT_TWINVQ,                ///< N                       Twin Vector Quantizer
  72     AOT_CELP,                  ///< N                       Code Excited Linear Prediction
  73     AOT_HVXC,                  ///< N                       Harmonic Vector eXcitation Coding
  74     AOT_TTSI             = 12, ///< N                       Text-To-Speech Interface
  75     AOT_MAINSYNTH,             ///< N                       Main Synthesis
  76     AOT_WAVESYNTH,             ///< N                       Wavetable Synthesis
  77     AOT_MIDI,                  ///< N                       General MIDI
  78     AOT_SAFX,                  ///< N                       Algorithmic Synthesis and Audio Effects
  79     AOT_ER_AAC_LC,             ///< N                       Error Resilient Low Complexity
  80     AOT_ER_AAC_LTP       = 19, ///< N                       Error Resilient Long Term Prediction
  81     AOT_ER_AAC_SCALABLE,       ///< N                       Error Resilient Scalable
  82     AOT_ER_TWINVQ,             ///< N                       Error Resilient Twin Vector Quantizer
  83     AOT_ER_BSAC,               ///< N                       Error Resilient Bit-Sliced Arithmetic Coding
  84     AOT_ER_AAC_LD,             ///< N                       Error Resilient Low Delay
  85     AOT_ER_CELP,               ///< N                       Error Resilient Code Excited Linear Prediction
  86     AOT_ER_HVXC,               ///< N                       Error Resilient Harmonic Vector eXcitation Coding
  87     AOT_ER_HILN,               ///< N                       Error Resilient Harmonic and Individual Lines plus Noise
  88     AOT_ER_PARAM,              ///< N                       Error Resilient Parametric
  89     AOT_SSC,                   ///< N                       SinuSoidal Coding
  90     AOT_PS,                    ///< N                       Parametric Stereo
  91     AOT_SURROUND,              ///< N                       MPEG Surround
  92     AOT_ESCAPE,                ///< Y                       Escape Value
  93     AOT_L1,                    ///< Y                       Layer 1
  94     AOT_L2,                    ///< Y                       Layer 2
  95     AOT_L3,                    ///< Y                       Layer 3
  96     AOT_DST,                   ///< N                       Direct Stream Transfer
  97     AOT_ALS,                   ///< Y                       Audio LosslesS
  98     AOT_SLS,                   ///< N                       Scalable LosslesS
  99     AOT_SLS_NON_CORE,          ///< N                       Scalable LosslesS (non core)
 100     AOT_ER_AAC_ELD,            ///< N                       Error Resilient Enhanced Low Delay
 101     AOT_SMR_SIMPLE,            ///< N                       Symbolic Music Representation Simple
 102     AOT_SMR_MAIN,              ///< N                       Symbolic Music Representation Main
 103     AOT_USAC_NOSBR,            ///< N                       Unified Speech and Audio Coding (no SBR)
 104     AOT_SAOC,                  ///< N                       Spatial Audio Object Coding
 105     AOT_LD_SURROUND,           ///< N                       Low Delay MPEG Surround
 106     AOT_USAC,                  ///< N                       Unified Speech and Audio Coding
 107 };
 108
 109 #define MAX_PCE_SIZE 304 ///<Maximum size of a PCE including the 3-bit ID_PCE
 110                          ///<marker and the comment
 111
 112 static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb,
 113                                                       GetBitContext *gb,
 114                                                       int bits)
 115 {
 116     unsigned int el = get_bits(gb, bits);
 117     put_bits(pb, bits, el);
 118     return el;
 119 }
 120
 121 static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
 122 {
 123     int five_bit_ch, four_bit_ch, comment_size, bits;
 124     int offset = put_bits_count(pb);
 125
 126     ff_pce_copy_bits(pb, gb, 10);               // Tag, Object Type, Frequency
 127     five_bit_ch  = ff_pce_copy_bits(pb, gb, 4); // Front
 128     five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side
 129     five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back
 130     four_bit_ch  = ff_pce_copy_bits(pb, gb, 2); // LFE
 131     four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data
 132     five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling
 133     if (ff_pce_copy_bits(pb, gb, 1))            // Mono Mixdown
 134         ff_pce_copy_bits(pb, gb, 4);
 135     if (ff_pce_copy_bits(pb, gb, 1))            // Stereo Mixdown
 136         ff_pce_copy_bits(pb, gb, 4);
 137     if (ff_pce_copy_bits(pb, gb, 1))            // Matrix Mixdown
 138         ff_pce_copy_bits(pb, gb, 3);
 139     for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
 140         ff_pce_copy_bits(pb, gb, 16);
 141     if (bits)
 142         ff_pce_copy_bits(pb, gb, bits);
 143     avpriv_align_put_bits(pb);
 144     align_get_bits(gb);
 145     comment_size = ff_pce_copy_bits(pb, gb, 8);
 146     for (; comment_size > 0; comment_size--)
 147         ff_pce_copy_bits(pb, gb, 8);
 148
 149     return put_bits_count(pb) - offset;
 150 }
 151
 152 #endif /* AVCODEC_MPEG4AUDIO_H */