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