mirror of https://git.ffmpeg.org/ffmpeg.git
162 lines
6.6 KiB
C
162 lines
6.6 KiB
C
/*
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* Float MPEG Audio decoder
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* Copyright (c) 2010 Michael Niedermayer
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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 "config_components.h"
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#include "libavutil/samplefmt.h"
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#define USE_FLOATS 1
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#include "codec_internal.h"
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#include "mpegaudio.h"
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#define SHR(a,b) ((a)*(1.0f/(1<<(b))))
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#define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5))
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#define FIXR(x) ((float)(x))
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#define FIXHR(x) ((float)(x))
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#define MULH3(x, y, s) ((s)*(y)*(x))
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#define MULLx(x, y, s) ((y)*(x))
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#define RENAME(a) a ## _float
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#define OUT_FMT AV_SAMPLE_FMT_FLT
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#define OUT_FMT_P AV_SAMPLE_FMT_FLTP
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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 float is_table[2][16] = {
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{ 0.000000000000000000e+00, 2.113248705863952637e-01, 3.660253882408142090e-01,
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5.000000000000000000e-01, 6.339746117591857910e-01, 7.886751294136047363e-01,
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1.000000000000000000e+00 },
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{ 1.000000000000000000e+00, 7.886751294136047363e-01, 6.339746117591857910e-01,
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5.000000000000000000e-01, 3.660253882408142090e-01, 2.113248705863952637e-01,
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0.000000000000000000e+00 }
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};
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/* Antialiasing table. See commit 6f1ec38ce2193d3d4cacd87edb452c6d7ba751ec
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* (mpegaudio: clean up compute_antialias() definition) for how they were
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* created. */
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static const float csa_table[8][4] = {
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{ 8.574929237365722656e-01, -5.144957900047302246e-01,
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3.429971337318420410e-01, -1.371988654136657715e+00 },
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{ 8.817420005798339844e-01, -4.717319905757904053e-01,
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4.100100100040435791e-01, -1.353474020957946777e+00 },
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{ 9.496286511421203613e-01, -3.133774697780609131e-01,
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6.362511515617370605e-01, -1.263006091117858887e+00 },
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{ 9.833145737648010254e-01, -1.819131970405578613e-01,
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8.014013767242431641e-01, -1.165227770805358887e+00 },
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{ 9.955177903175354004e-01, -9.457419067621231079e-02,
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9.009436368942260742e-01, -1.090092062950134277e+00 },
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{ 9.991605877876281738e-01, -4.096558317542076111e-02,
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9.581949710845947266e-01, -1.040126085281372070e+00 },
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{ 9.998992085456848145e-01, -1.419856864959001541e-02,
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9.857006072998046875e-01, -1.014097809791564941e+00 },
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{ 9.999931454658508301e-01, -3.699974622577428818e-03,
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9.962931871414184570e-01, -1.003693103790283203e+00 }
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};
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#include "mpegaudiodec_template.c"
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#if CONFIG_MP1FLOAT_DECODER
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const FFCodec ff_mp1float_decoder = {
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.p.name = "mp1float",
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CODEC_LONG_NAME("MP1 (MPEG audio layer 1)"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
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AV_CODEC_CAP_DR1,
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.flush = flush,
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_FLT,
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AV_SAMPLE_FMT_NONE },
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};
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#endif
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#if CONFIG_MP2FLOAT_DECODER
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const FFCodec ff_mp2float_decoder = {
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.p.name = "mp2float",
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CODEC_LONG_NAME("MP2 (MPEG audio layer 2)"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
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AV_CODEC_CAP_DR1,
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.flush = flush,
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_FLT,
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AV_SAMPLE_FMT_NONE },
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};
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#endif
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#if CONFIG_MP3FLOAT_DECODER
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const FFCodec ff_mp3float_decoder = {
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.p.name = "mp3float",
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CODEC_LONG_NAME("MP3 (MPEG audio layer 3)"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
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AV_CODEC_CAP_DR1,
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.flush = flush,
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_FLT,
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AV_SAMPLE_FMT_NONE },
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};
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#endif
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#if CONFIG_MP3ADUFLOAT_DECODER
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const FFCodec ff_mp3adufloat_decoder = {
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.p.name = "mp3adufloat",
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CODEC_LONG_NAME("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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FF_CODEC_DECODE_CB(decode_frame_adu),
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.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
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AV_CODEC_CAP_DR1,
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.flush = flush,
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_FLT,
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AV_SAMPLE_FMT_NONE },
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};
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#endif
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#if CONFIG_MP3ON4FLOAT_DECODER
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const FFCodec ff_mp3on4float_decoder = {
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.p.name = "mp3on4float",
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CODEC_LONG_NAME("MP3onMP4"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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FF_CODEC_DECODE_CB(decode_frame_mp3on4),
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.p.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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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_NONE },
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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};
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#endif
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