/* * Float MPEG Audio decoder * Copyright (c) 2010 Michael Niedermayer * * 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 */ #include "config.h" #include "config_components.h" #include "libavutil/samplefmt.h" #define USE_FLOATS 1 #include "codec_internal.h" #include "mpegaudio.h" #define SHR(a,b) ((a)*(1.0f/(1<<(b)))) #define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) #define FIXR(x) ((float)(x)) #define FIXHR(x) ((float)(x)) #define MULH3(x, y, s) ((s)*(y)*(x)) #define MULLx(x, y, s) ((y)*(x)) #define RENAME(a) a ## _float #define OUT_FMT AV_SAMPLE_FMT_FLT #define OUT_FMT_P AV_SAMPLE_FMT_FLTP /* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274 * (float based mp1/mp2/mp3 decoders.) for how they were created. */ static const float is_table[2][16] = { { 0.000000000000000000e+00, 2.113248705863952637e-01, 3.660253882408142090e-01, 5.000000000000000000e-01, 6.339746117591857910e-01, 7.886751294136047363e-01, 1.000000000000000000e+00 }, { 1.000000000000000000e+00, 7.886751294136047363e-01, 6.339746117591857910e-01, 5.000000000000000000e-01, 3.660253882408142090e-01, 2.113248705863952637e-01, 0.000000000000000000e+00 } }; /* Antialiasing table. See commit 6f1ec38ce2193d3d4cacd87edb452c6d7ba751ec * (mpegaudio: clean up compute_antialias() definition) for how they were * created. */ static const float csa_table[8][4] = { { 8.574929237365722656e-01, -5.144957900047302246e-01, 3.429971337318420410e-01, -1.371988654136657715e+00 }, { 8.817420005798339844e-01, -4.717319905757904053e-01, 4.100100100040435791e-01, -1.353474020957946777e+00 }, { 9.496286511421203613e-01, -3.133774697780609131e-01, 6.362511515617370605e-01, -1.263006091117858887e+00 }, { 9.833145737648010254e-01, -1.819131970405578613e-01, 8.014013767242431641e-01, -1.165227770805358887e+00 }, { 9.955177903175354004e-01, -9.457419067621231079e-02, 9.009436368942260742e-01, -1.090092062950134277e+00 }, { 9.991605877876281738e-01, -4.096558317542076111e-02, 9.581949710845947266e-01, -1.040126085281372070e+00 }, { 9.998992085456848145e-01, -1.419856864959001541e-02, 9.857006072998046875e-01, -1.014097809791564941e+00 }, { 9.999931454658508301e-01, -3.699974622577428818e-03, 9.962931871414184570e-01, -1.003693103790283203e+00 } }; #include "mpegaudiodec_template.c" #if CONFIG_MP1FLOAT_DECODER const FFCodec ff_mp1float_decoder = { .p.name = "mp1float", CODEC_LONG_NAME("MP1 (MPEG audio layer 1)"), .p.type = AVMEDIA_TYPE_AUDIO, .p.id = AV_CODEC_ID_MP1, .priv_data_size = sizeof(MPADecodeContext), .init = decode_init, FF_CODEC_DECODE_CB(decode_frame), .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1, .flush = flush, .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE }, }; #endif #if CONFIG_MP2FLOAT_DECODER const FFCodec ff_mp2float_decoder = { .p.name = "mp2float", CODEC_LONG_NAME("MP2 (MPEG audio layer 2)"), .p.type = AVMEDIA_TYPE_AUDIO, .p.id = AV_CODEC_ID_MP2, .priv_data_size = sizeof(MPADecodeContext), .init = decode_init, FF_CODEC_DECODE_CB(decode_frame), .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1, .flush = flush, .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE }, }; #endif #if CONFIG_MP3FLOAT_DECODER const FFCodec ff_mp3float_decoder = { .p.name = "mp3float", CODEC_LONG_NAME("MP3 (MPEG audio layer 3)"), .p.type = AVMEDIA_TYPE_AUDIO, .p.id = AV_CODEC_ID_MP3, .priv_data_size = sizeof(MPADecodeContext), .init = decode_init, FF_CODEC_DECODE_CB(decode_frame), .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1, .flush = flush, .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE }, }; #endif #if CONFIG_MP3ADUFLOAT_DECODER const FFCodec ff_mp3adufloat_decoder = { .p.name = "mp3adufloat", CODEC_LONG_NAME("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), .p.type = AVMEDIA_TYPE_AUDIO, .p.id = AV_CODEC_ID_MP3ADU, .priv_data_size = sizeof(MPADecodeContext), .init = decode_init, FF_CODEC_DECODE_CB(decode_frame_adu), .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1, .flush = flush, .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE }, }; #endif #if CONFIG_MP3ON4FLOAT_DECODER const FFCodec ff_mp3on4float_decoder = { .p.name = "mp3on4float", CODEC_LONG_NAME("MP3onMP4"), .p.type = AVMEDIA_TYPE_AUDIO, .p.id = AV_CODEC_ID_MP3ON4, .priv_data_size = sizeof(MP3On4DecodeContext), .init = decode_init_mp3on4, .close = decode_close_mp3on4, FF_CODEC_DECODE_CB(decode_frame_mp3on4), .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1, .flush = flush_mp3on4, .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }, .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, }; #endif