1 /* 2 * Fixed-point MPEG audio decoder 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #include "config.h" 22 #include "libavutil/samplefmt.h" 23 24 #define USE_FLOATS 0 25 26 #include "mpegaudio.h" 27 28 #define SHR(a,b) (((int)(a))>>(b)) 29 /* WARNING: only correct for positive numbers */ 30 #define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) 31 #define FIXR(a) ((int)((a) * FRAC_ONE + 0.5)) 32 #define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5)) 33 #define MULH3(x, y, s) MULH((s)*(x), y) 34 #define MULLx(x, y, s) MULL((int)(x),(y),s) 35 #define RENAME(a) a ## _fixed 36 #define OUT_FMT AV_SAMPLE_FMT_S16 37 #define OUT_FMT_P AV_SAMPLE_FMT_S16P 38 39 /* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274 40 * (float based mp1/mp2/mp3 decoders.) for how they were created. */ 41 static const int32_t is_table[2][16] = { 42 { 0x000000, 0x1B0CB1, 0x2ED9EC, 0x400000, 0x512614, 0x64F34F, 0x800000 }, 43 { 0x800000, 0x64F34F, 0x512614, 0x400000, 0x2ED9EC, 0x1B0CB1, 0x000000 } 44 }; 45 46 /* Antialiasing table. See commit ce4a29c066cddfc180979ed86396812f24337985 47 * (optimize antialias) for how they were created. */ 48 static const int32_t csa_table[8][4] = { 49 { 0x36E129F8, 0xDF128056, 0x15F3AA4E, 0xA831565E }, 50 { 0x386E75F2, 0xE1CF24A5, 0x1A3D9A97, 0xA960AEB3 }, 51 { 0x3CC6B73A, 0xEBF19FA6, 0x28B856E0, 0xAF2AE86C }, 52 { 0x3EEEA054, 0xF45B88BC, 0x334A2910, 0xB56CE868 }, 53 { 0x3FB6905C, 0xF9F27F18, 0x39A90F74, 0xBA3BEEBC }, 54 { 0x3FF23F20, 0xFD60D1E4, 0x3D531104, 0xBD6E92C4 }, 55 { 0x3FFE5932, 0xFF175EE4, 0x3F15B816, 0xBF1905B2 }, 56 { 0x3FFFE34A, 0xFFC3612F, 0x3FC34479, 0xBFC37DE5 } 57 }; 58 59 #include "mpegaudiodec_template.c" 60 61 #if CONFIG_MP1_DECODER 62 AVCodec ff_mp1_decoder = { 63 .name = "mp1", 64 .long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), 65 .type = AVMEDIA_TYPE_AUDIO, 66 .id = AV_CODEC_ID_MP1, 67 .priv_data_size = sizeof(MPADecodeContext), 68 .init = decode_init, 69 .decode = decode_frame, 70 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 71 AV_CODEC_CAP_DR1, 72 .flush = flush, 73 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 74 AV_SAMPLE_FMT_S16, 75 AV_SAMPLE_FMT_NONE }, 76 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 77 }; 78 #endif 79 #if CONFIG_MP2_DECODER 80 AVCodec ff_mp2_decoder = { 81 .name = "mp2", 82 .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), 83 .type = AVMEDIA_TYPE_AUDIO, 84 .id = AV_CODEC_ID_MP2, 85 .priv_data_size = sizeof(MPADecodeContext), 86 .init = decode_init, 87 .decode = decode_frame, 88 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 89 AV_CODEC_CAP_DR1, 90 .flush = flush, 91 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 92 AV_SAMPLE_FMT_S16, 93 AV_SAMPLE_FMT_NONE }, 94 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 95 }; 96 #endif 97 #if CONFIG_MP3_DECODER 98 AVCodec ff_mp3_decoder = { 99 .name = "mp3", 100 .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), 101 .type = AVMEDIA_TYPE_AUDIO, 102 .id = AV_CODEC_ID_MP3, 103 .priv_data_size = sizeof(MPADecodeContext), 104 .init = decode_init, 105 .decode = decode_frame, 106 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 107 AV_CODEC_CAP_DR1, 108 .flush = flush, 109 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 110 AV_SAMPLE_FMT_S16, 111 AV_SAMPLE_FMT_NONE }, 112 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 113 }; 114 #endif 115 #if CONFIG_MP3ADU_DECODER 116 AVCodec ff_mp3adu_decoder = { 117 .name = "mp3adu", 118 .long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), 119 .type = AVMEDIA_TYPE_AUDIO, 120 .id = AV_CODEC_ID_MP3ADU, 121 .priv_data_size = sizeof(MPADecodeContext), 122 .init = decode_init, 123 .decode = decode_frame_adu, 124 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 125 AV_CODEC_CAP_DR1, 126 .flush = flush, 127 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 128 AV_SAMPLE_FMT_S16, 129 AV_SAMPLE_FMT_NONE }, 130 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 131 }; 132 #endif 133 #if CONFIG_MP3ON4_DECODER 134 AVCodec ff_mp3on4_decoder = { 135 .name = "mp3on4", 136 .long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"), 137 .type = AVMEDIA_TYPE_AUDIO, 138 .id = AV_CODEC_ID_MP3ON4, 139 .priv_data_size = sizeof(MP3On4DecodeContext), 140 .init = decode_init_mp3on4, 141 .close = decode_close_mp3on4, 142 .decode = decode_frame_mp3on4, 143 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 144 AV_CODEC_CAP_DR1, 145 .flush = flush_mp3on4, 146 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 147 AV_SAMPLE_FMT_NONE }, 148 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 149 }; 150 #endif 151