1/* 2 * Float MPEG Audio decoder 3 * Copyright (c) 2010 Michael Niedermayer 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "config.h" 23#include "config_components.h" 24#include "libavutil/samplefmt.h" 25 26#define USE_FLOATS 1 27 28#include "codec_internal.h" 29#include "mpegaudio.h" 30 31#define SHR(a,b) ((a)*(1.0f/(1<<(b)))) 32#define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) 33#define FIXR(x) ((float)(x)) 34#define FIXHR(x) ((float)(x)) 35#define MULH3(x, y, s) ((s)*(y)*(x)) 36#define MULLx(x, y, s) ((y)*(x)) 37#define RENAME(a) a ## _float 38#define OUT_FMT AV_SAMPLE_FMT_FLT 39#define OUT_FMT_P AV_SAMPLE_FMT_FLTP 40 41/* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274 42 * (float based mp1/mp2/mp3 decoders.) for how they were created. */ 43static const float is_table[2][16] = { 44 { 0.000000000000000000e+00, 2.113248705863952637e-01, 3.660253882408142090e-01, 45 5.000000000000000000e-01, 6.339746117591857910e-01, 7.886751294136047363e-01, 46 1.000000000000000000e+00 }, 47 { 1.000000000000000000e+00, 7.886751294136047363e-01, 6.339746117591857910e-01, 48 5.000000000000000000e-01, 3.660253882408142090e-01, 2.113248705863952637e-01, 49 0.000000000000000000e+00 } 50}; 51 52/* Antialiasing table. See commit 6f1ec38ce2193d3d4cacd87edb452c6d7ba751ec 53 * (mpegaudio: clean up compute_antialias() definition) for how they were 54 * created. */ 55static const float csa_table[8][4] = { 56 { 8.574929237365722656e-01, -5.144957900047302246e-01, 57 3.429971337318420410e-01, -1.371988654136657715e+00 }, 58 { 8.817420005798339844e-01, -4.717319905757904053e-01, 59 4.100100100040435791e-01, -1.353474020957946777e+00 }, 60 { 9.496286511421203613e-01, -3.133774697780609131e-01, 61 6.362511515617370605e-01, -1.263006091117858887e+00 }, 62 { 9.833145737648010254e-01, -1.819131970405578613e-01, 63 8.014013767242431641e-01, -1.165227770805358887e+00 }, 64 { 9.955177903175354004e-01, -9.457419067621231079e-02, 65 9.009436368942260742e-01, -1.090092062950134277e+00 }, 66 { 9.991605877876281738e-01, -4.096558317542076111e-02, 67 9.581949710845947266e-01, -1.040126085281372070e+00 }, 68 { 9.998992085456848145e-01, -1.419856864959001541e-02, 69 9.857006072998046875e-01, -1.014097809791564941e+00 }, 70 { 9.999931454658508301e-01, -3.699974622577428818e-03, 71 9.962931871414184570e-01, -1.003693103790283203e+00 } 72}; 73 74#include "mpegaudiodec_template.c" 75 76#if CONFIG_MP1FLOAT_DECODER 77const FFCodec ff_mp1float_decoder = { 78 .p.name = "mp1float", 79 .p.long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), 80 .p.type = AVMEDIA_TYPE_AUDIO, 81 .p.id = AV_CODEC_ID_MP1, 82 .priv_data_size = sizeof(MPADecodeContext), 83 .init = decode_init, 84 FF_CODEC_DECODE_CB(decode_frame), 85 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 86 AV_CODEC_CAP_DR1, 87 .flush = flush, 88 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 89 AV_SAMPLE_FMT_FLT, 90 AV_SAMPLE_FMT_NONE }, 91 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 92}; 93#endif 94#if CONFIG_MP2FLOAT_DECODER 95const FFCodec ff_mp2float_decoder = { 96 .p.name = "mp2float", 97 .p.long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), 98 .p.type = AVMEDIA_TYPE_AUDIO, 99 .p.id = AV_CODEC_ID_MP2, 100 .priv_data_size = sizeof(MPADecodeContext), 101 .init = decode_init, 102 FF_CODEC_DECODE_CB(decode_frame), 103 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 104 AV_CODEC_CAP_DR1, 105 .flush = flush, 106 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 107 AV_SAMPLE_FMT_FLT, 108 AV_SAMPLE_FMT_NONE }, 109 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 110}; 111#endif 112#if CONFIG_MP3FLOAT_DECODER 113const FFCodec ff_mp3float_decoder = { 114 .p.name = "mp3float", 115 .p.long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), 116 .p.type = AVMEDIA_TYPE_AUDIO, 117 .p.id = AV_CODEC_ID_MP3, 118 .priv_data_size = sizeof(MPADecodeContext), 119 .init = decode_init, 120 FF_CODEC_DECODE_CB(decode_frame), 121 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 122 AV_CODEC_CAP_DR1, 123 .flush = flush, 124 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 125 AV_SAMPLE_FMT_FLT, 126 AV_SAMPLE_FMT_NONE }, 127 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 128}; 129#endif 130#if CONFIG_MP3ADUFLOAT_DECODER 131const FFCodec ff_mp3adufloat_decoder = { 132 .p.name = "mp3adufloat", 133 .p.long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), 134 .p.type = AVMEDIA_TYPE_AUDIO, 135 .p.id = AV_CODEC_ID_MP3ADU, 136 .priv_data_size = sizeof(MPADecodeContext), 137 .init = decode_init, 138 FF_CODEC_DECODE_CB(decode_frame_adu), 139 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 140 AV_CODEC_CAP_DR1, 141 .flush = flush, 142 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 143 AV_SAMPLE_FMT_FLT, 144 AV_SAMPLE_FMT_NONE }, 145 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 146}; 147#endif 148#if CONFIG_MP3ON4FLOAT_DECODER 149const FFCodec ff_mp3on4float_decoder = { 150 .p.name = "mp3on4float", 151 .p.long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"), 152 .p.type = AVMEDIA_TYPE_AUDIO, 153 .p.id = AV_CODEC_ID_MP3ON4, 154 .priv_data_size = sizeof(MP3On4DecodeContext), 155 .init = decode_init_mp3on4, 156 .close = decode_close_mp3on4, 157 FF_CODEC_DECODE_CB(decode_frame_mp3on4), 158 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 159 AV_CODEC_CAP_DR1, 160 .flush = flush_mp3on4, 161 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 162 AV_SAMPLE_FMT_NONE }, 163 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 164}; 165#endif 166