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 "libavutil/samplefmt.h" 24 25 #define USE_FLOATS 1 26 27 #include "mpegaudio.h" 28 29 #define SHR(a,b) ((a)*(1.0f/(1<<(b)))) 30 #define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) 31 #define FIXR(x) ((float)(x)) 32 #define FIXHR(x) ((float)(x)) 33 #define MULH3(x, y, s) ((s)*(y)*(x)) 34 #define MULLx(x, y, s) ((y)*(x)) 35 #define RENAME(a) a ## _float 36 #define OUT_FMT AV_SAMPLE_FMT_FLT 37 #define OUT_FMT_P AV_SAMPLE_FMT_FLTP 38 39 /* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274 40 * (float based mp1/mp2/mp3 decoders.) for how they were created. */ 41 static const float is_table[2][16] = { 42 { 0.000000000000000000e+00, 2.113248705863952637e-01, 3.660253882408142090e-01, 43 5.000000000000000000e-01, 6.339746117591857910e-01, 7.886751294136047363e-01, 44 1.000000000000000000e+00 }, 45 { 1.000000000000000000e+00, 7.886751294136047363e-01, 6.339746117591857910e-01, 46 5.000000000000000000e-01, 3.660253882408142090e-01, 2.113248705863952637e-01, 47 0.000000000000000000e+00 } 48 }; 49 50 /* Antialiasing table. See commit 6f1ec38ce2193d3d4cacd87edb452c6d7ba751ec 51 * (mpegaudio: clean up compute_antialias() definition) for how they were 52 * created. */ 53 static const float csa_table[8][4] = { 54 { 8.574929237365722656e-01, -5.144957900047302246e-01, 55 3.429971337318420410e-01, -1.371988654136657715e+00 }, 56 { 8.817420005798339844e-01, -4.717319905757904053e-01, 57 4.100100100040435791e-01, -1.353474020957946777e+00 }, 58 { 9.496286511421203613e-01, -3.133774697780609131e-01, 59 6.362511515617370605e-01, -1.263006091117858887e+00 }, 60 { 9.833145737648010254e-01, -1.819131970405578613e-01, 61 8.014013767242431641e-01, -1.165227770805358887e+00 }, 62 { 9.955177903175354004e-01, -9.457419067621231079e-02, 63 9.009436368942260742e-01, -1.090092062950134277e+00 }, 64 { 9.991605877876281738e-01, -4.096558317542076111e-02, 65 9.581949710845947266e-01, -1.040126085281372070e+00 }, 66 { 9.998992085456848145e-01, -1.419856864959001541e-02, 67 9.857006072998046875e-01, -1.014097809791564941e+00 }, 68 { 9.999931454658508301e-01, -3.699974622577428818e-03, 69 9.962931871414184570e-01, -1.003693103790283203e+00 } 70 }; 71 72 #include "mpegaudiodec_template.c" 73 74 #if CONFIG_MP1FLOAT_DECODER 75 AVCodec ff_mp1float_decoder = { 76 .name = "mp1float", 77 .long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), 78 .type = AVMEDIA_TYPE_AUDIO, 79 .id = AV_CODEC_ID_MP1, 80 .priv_data_size = sizeof(MPADecodeContext), 81 .init = decode_init, 82 .decode = decode_frame, 83 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 84 AV_CODEC_CAP_DR1, 85 .flush = flush, 86 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 87 AV_SAMPLE_FMT_FLT, 88 AV_SAMPLE_FMT_NONE }, 89 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 90 }; 91 #endif 92 #if CONFIG_MP2FLOAT_DECODER 93 AVCodec ff_mp2float_decoder = { 94 .name = "mp2float", 95 .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), 96 .type = AVMEDIA_TYPE_AUDIO, 97 .id = AV_CODEC_ID_MP2, 98 .priv_data_size = sizeof(MPADecodeContext), 99 .init = decode_init, 100 .decode = decode_frame, 101 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 102 AV_CODEC_CAP_DR1, 103 .flush = flush, 104 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 105 AV_SAMPLE_FMT_FLT, 106 AV_SAMPLE_FMT_NONE }, 107 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 108 }; 109 #endif 110 #if CONFIG_MP3FLOAT_DECODER 111 AVCodec ff_mp3float_decoder = { 112 .name = "mp3float", 113 .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), 114 .type = AVMEDIA_TYPE_AUDIO, 115 .id = AV_CODEC_ID_MP3, 116 .priv_data_size = sizeof(MPADecodeContext), 117 .init = decode_init, 118 .decode = decode_frame, 119 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 120 AV_CODEC_CAP_DR1, 121 .flush = flush, 122 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 123 AV_SAMPLE_FMT_FLT, 124 AV_SAMPLE_FMT_NONE }, 125 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 126 }; 127 #endif 128 #if CONFIG_MP3ADUFLOAT_DECODER 129 AVCodec ff_mp3adufloat_decoder = { 130 .name = "mp3adufloat", 131 .long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), 132 .type = AVMEDIA_TYPE_AUDIO, 133 .id = AV_CODEC_ID_MP3ADU, 134 .priv_data_size = sizeof(MPADecodeContext), 135 .init = decode_init, 136 .decode = decode_frame_adu, 137 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 138 AV_CODEC_CAP_DR1, 139 .flush = flush, 140 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 141 AV_SAMPLE_FMT_FLT, 142 AV_SAMPLE_FMT_NONE }, 143 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 144 }; 145 #endif 146 #if CONFIG_MP3ON4FLOAT_DECODER 147 AVCodec ff_mp3on4float_decoder = { 148 .name = "mp3on4float", 149 .long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"), 150 .type = AVMEDIA_TYPE_AUDIO, 151 .id = AV_CODEC_ID_MP3ON4, 152 .priv_data_size = sizeof(MP3On4DecodeContext), 153 .init = decode_init_mp3on4, 154 .close = decode_close_mp3on4, 155 .decode = decode_frame_mp3on4, 156 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 157 AV_CODEC_CAP_DR1, 158 .flush = flush_mp3on4, 159 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 160 AV_SAMPLE_FMT_NONE }, 161 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 162 }; 163 #endif 164