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150 lines
6.0 KiB
150 lines
6.0 KiB
/* |
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* Fixed-point MPEG audio decoder |
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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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#include "config.h" |
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#include "libavutil/samplefmt.h" |
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#define USE_FLOATS 0 |
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#include "mpegaudio.h" |
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#define SHR(a,b) (((int)(a))>>(b)) |
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/* WARNING: only correct for positive numbers */ |
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#define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) |
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#define FIXR(a) ((int)((a) * FRAC_ONE + 0.5)) |
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#define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5)) |
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#define MULH3(x, y, s) MULH((s)*(x), y) |
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#define MULLx(x, y, s) MULL((int)(x),(y),s) |
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#define RENAME(a) a ## _fixed |
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#define OUT_FMT AV_SAMPLE_FMT_S16 |
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#define OUT_FMT_P AV_SAMPLE_FMT_S16P |
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/* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274 |
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* (float based mp1/mp2/mp3 decoders.) for how they were created. */ |
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static const int32_t is_table[2][16] = { |
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{ 0x000000, 0x1B0CB1, 0x2ED9EC, 0x400000, 0x512614, 0x64F34F, 0x800000 }, |
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{ 0x800000, 0x64F34F, 0x512614, 0x400000, 0x2ED9EC, 0x1B0CB1, 0x000000 } |
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}; |
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/* Antialiasing table. See commit ce4a29c066cddfc180979ed86396812f24337985 |
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* (optimize antialias) for how they were created. */ |
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static const int32_t csa_table[8][4] = { |
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{ 0x36E129F8, 0xDF128056, 0x15F3AA4E, 0xA831565E }, |
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{ 0x386E75F2, 0xE1CF24A5, 0x1A3D9A97, 0xA960AEB3 }, |
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{ 0x3CC6B73A, 0xEBF19FA6, 0x28B856E0, 0xAF2AE86C }, |
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{ 0x3EEEA054, 0xF45B88BC, 0x334A2910, 0xB56CE868 }, |
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{ 0x3FB6905C, 0xF9F27F18, 0x39A90F74, 0xBA3BEEBC }, |
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{ 0x3FF23F20, 0xFD60D1E4, 0x3D531104, 0xBD6E92C4 }, |
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{ 0x3FFE5932, 0xFF175EE4, 0x3F15B816, 0xBF1905B2 }, |
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{ 0x3FFFE34A, 0xFFC3612F, 0x3FC34479, 0xBFC37DE5 } |
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}; |
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#include "mpegaudiodec_template.c" |
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#if CONFIG_MP1_DECODER |
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AVCodec ff_mp1_decoder = { |
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.name = "mp1", |
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.long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_MP1, |
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.priv_data_size = sizeof(MPADecodeContext), |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_CHANNEL_CONF | |
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AV_CODEC_CAP_DR1, |
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.flush = flush, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |
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#endif |
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#if CONFIG_MP2_DECODER |
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AVCodec ff_mp2_decoder = { |
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.name = "mp2", |
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.long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_MP2, |
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.priv_data_size = sizeof(MPADecodeContext), |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_CHANNEL_CONF | |
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AV_CODEC_CAP_DR1, |
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.flush = flush, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |
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#endif |
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#if CONFIG_MP3_DECODER |
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AVCodec ff_mp3_decoder = { |
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.name = "mp3", |
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.long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_MP3, |
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.priv_data_size = sizeof(MPADecodeContext), |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_CHANNEL_CONF | |
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AV_CODEC_CAP_DR1, |
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.flush = flush, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |
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#endif |
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#if CONFIG_MP3ADU_DECODER |
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AVCodec ff_mp3adu_decoder = { |
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.name = "mp3adu", |
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.long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_MP3ADU, |
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.priv_data_size = sizeof(MPADecodeContext), |
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.init = decode_init, |
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.decode = decode_frame_adu, |
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.capabilities = AV_CODEC_CAP_CHANNEL_CONF | |
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AV_CODEC_CAP_DR1, |
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.flush = flush, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |
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#endif |
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#if CONFIG_MP3ON4_DECODER |
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AVCodec ff_mp3on4_decoder = { |
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.name = "mp3on4", |
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.long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_MP3ON4, |
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.priv_data_size = sizeof(MP3On4DecodeContext), |
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.init = decode_init_mp3on4, |
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.close = decode_close_mp3on4, |
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.decode = decode_frame_mp3on4, |
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.capabilities = AV_CODEC_CAP_CHANNEL_CONF | |
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AV_CODEC_CAP_DR1, |
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.flush = flush_mp3on4, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, |
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}; |
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#endif
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