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177 lines
8.7 KiB
177 lines
8.7 KiB
/* |
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* MPEG-4 Audio common header |
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* Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_MPEG4AUDIO_H |
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#define AVCODEC_MPEG4AUDIO_H |
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#include <stdint.h> |
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#include "libavutil/attributes.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "put_bits.h" |
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typedef struct MPEG4AudioConfig { |
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int object_type; |
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int sampling_index; |
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int sample_rate; |
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int chan_config; |
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int sbr; ///< -1 implicit, 1 presence |
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int ext_object_type; |
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int ext_sampling_index; |
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int ext_sample_rate; |
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int ext_chan_config; |
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int channels; |
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int ps; ///< -1 implicit, 1 presence |
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int frame_length_short; |
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} MPEG4AudioConfig; |
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extern av_export_avcodec const int avpriv_mpeg4audio_sample_rates[16]; |
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extern const uint8_t ff_mpeg4audio_channels[14]; |
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/** |
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* Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration. |
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* @param[in] c MPEG4AudioConfig structure to fill. |
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* @param[in] gb Extradata from container. |
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* @param[in] sync_extension look for a sync extension after config if true. |
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* @param[in] logctx opaque struct starting with an AVClass element, used for logging. |
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* @return negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata. |
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*/ |
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int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb, |
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int sync_extension, void *logctx); |
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#if LIBAVCODEC_VERSION_MAJOR < 59 |
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/** |
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* Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. |
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* @param[in] c MPEG4AudioConfig structure to fill. |
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* @param[in] buf Extradata from container. |
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* @param[in] bit_size Extradata size in bits. |
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* @param[in] sync_extension look for a sync extension after config if true. |
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* @return negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata. |
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*/ |
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int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, |
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int bit_size, int sync_extension); |
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#endif |
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/** |
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* Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. |
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* @param[in] c MPEG4AudioConfig structure to fill. |
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* @param[in] buf Extradata from container. |
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* @param[in] size Extradata size in bytes. |
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* @param[in] sync_extension look for a sync extension after config if true. |
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* @param[in] logctx opaque struct starting with an AVClass element, used for logging. |
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* @return negative AVERROR code on error, AudioSpecificConfig bit index in extradata on success. |
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*/ |
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int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf, |
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int size, int sync_extension, void *logctx); |
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enum AudioObjectType { |
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AOT_NULL, |
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// Support? Name |
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AOT_AAC_MAIN, ///< Y Main |
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AOT_AAC_LC, ///< Y Low Complexity |
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AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate |
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AOT_AAC_LTP, ///< Y Long Term Prediction |
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AOT_SBR, ///< Y Spectral Band Replication |
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AOT_AAC_SCALABLE, ///< N Scalable |
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AOT_TWINVQ, ///< N Twin Vector Quantizer |
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AOT_CELP, ///< N Code Excited Linear Prediction |
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AOT_HVXC, ///< N Harmonic Vector eXcitation Coding |
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AOT_TTSI = 12, ///< N Text-To-Speech Interface |
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AOT_MAINSYNTH, ///< N Main Synthesis |
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AOT_WAVESYNTH, ///< N Wavetable Synthesis |
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AOT_MIDI, ///< N General MIDI |
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AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects |
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AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity |
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AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction |
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AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable |
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AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer |
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AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding |
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AOT_ER_AAC_LD, ///< N Error Resilient Low Delay |
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AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction |
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AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding |
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AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise |
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AOT_ER_PARAM, ///< N Error Resilient Parametric |
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AOT_SSC, ///< N SinuSoidal Coding |
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AOT_PS, ///< N Parametric Stereo |
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AOT_SURROUND, ///< N MPEG Surround |
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AOT_ESCAPE, ///< Y Escape Value |
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AOT_L1, ///< Y Layer 1 |
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AOT_L2, ///< Y Layer 2 |
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AOT_L3, ///< Y Layer 3 |
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AOT_DST, ///< N Direct Stream Transfer |
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AOT_ALS, ///< Y Audio LosslesS |
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AOT_SLS, ///< N Scalable LosslesS |
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AOT_SLS_NON_CORE, ///< N Scalable LosslesS (non core) |
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AOT_ER_AAC_ELD, ///< N Error Resilient Enhanced Low Delay |
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AOT_SMR_SIMPLE, ///< N Symbolic Music Representation Simple |
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AOT_SMR_MAIN, ///< N Symbolic Music Representation Main |
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AOT_USAC_NOSBR, ///< N Unified Speech and Audio Coding (no SBR) |
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AOT_SAOC, ///< N Spatial Audio Object Coding |
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AOT_LD_SURROUND, ///< N Low Delay MPEG Surround |
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AOT_USAC, ///< N Unified Speech and Audio Coding |
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}; |
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#define MAX_PCE_SIZE 320 ///<Maximum size of a PCE including the 3-bit ID_PCE |
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///<marker and the comment |
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static av_always_inline unsigned int ff_pce_copy_bits(PutBitContext *pb, |
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GetBitContext *gb, |
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int bits) |
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{ |
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unsigned int el = get_bits(gb, bits); |
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put_bits(pb, bits, el); |
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return el; |
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} |
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static inline int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb) |
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{ |
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int five_bit_ch, four_bit_ch, comment_size, bits; |
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int offset = put_bits_count(pb); |
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ff_pce_copy_bits(pb, gb, 10); // Tag, Object Type, Frequency |
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five_bit_ch = ff_pce_copy_bits(pb, gb, 4); // Front |
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five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Side |
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five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Back |
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four_bit_ch = ff_pce_copy_bits(pb, gb, 2); // LFE |
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four_bit_ch += ff_pce_copy_bits(pb, gb, 3); // Data |
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five_bit_ch += ff_pce_copy_bits(pb, gb, 4); // Coupling |
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if (ff_pce_copy_bits(pb, gb, 1)) // Mono Mixdown |
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ff_pce_copy_bits(pb, gb, 4); |
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if (ff_pce_copy_bits(pb, gb, 1)) // Stereo Mixdown |
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ff_pce_copy_bits(pb, gb, 4); |
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if (ff_pce_copy_bits(pb, gb, 1)) // Matrix Mixdown |
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ff_pce_copy_bits(pb, gb, 3); |
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for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16) |
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ff_pce_copy_bits(pb, gb, 16); |
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if (bits) |
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ff_pce_copy_bits(pb, gb, bits); |
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align_put_bits(pb); |
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align_get_bits(gb); |
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comment_size = ff_pce_copy_bits(pb, gb, 8); |
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for (; comment_size > 0; comment_size--) |
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ff_pce_copy_bits(pb, gb, 8); |
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return put_bits_count(pb) - offset; |
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} |
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#endif /* AVCODEC_MPEG4AUDIO_H */
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