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- /*
- * MPEG-4 Audio common header
- * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
- *
- * This file is part of Libav.
- *
- * Libav 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.
- *
- * Libav 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 Libav; 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 "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 const int avpriv_mpeg4audio_sample_rates[16];
- extern const uint8_t ff_mpeg4audio_channels[8];
-
- /**
- * Parse MPEG-4 systems extradata 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 304 ///<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 */
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