mpegaudiodec_fixed.c (5931B)
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 "config_components.h" 23 #include "libavutil/samplefmt.h" 24 25 #define USE_FLOATS 0 26 27 #include "codec_internal.h" 28 #include "mpegaudio.h" 29 30 #define SHR(a,b) (((int)(a))>>(b)) 31 /* WARNING: only correct for positive numbers */ 32 #define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) 33 #define FIXR(a) ((int)((a) * FRAC_ONE + 0.5)) 34 #define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5)) 35 #define MULH3(x, y, s) MULH((s)*(x), y) 36 #define MULLx(x, y, s) MULL((int)(x),(y),s) 37 #define RENAME(a) a ## _fixed 38 #define OUT_FMT AV_SAMPLE_FMT_S16 39 #define OUT_FMT_P AV_SAMPLE_FMT_S16P 40 41 /* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274 42 * (float based mp1/mp2/mp3 decoders.) for how they were created. */ 43 static const int32_t is_table[2][16] = { 44 { 0x000000, 0x1B0CB1, 0x2ED9EC, 0x400000, 0x512614, 0x64F34F, 0x800000 }, 45 { 0x800000, 0x64F34F, 0x512614, 0x400000, 0x2ED9EC, 0x1B0CB1, 0x000000 } 46 }; 47 48 /* Antialiasing table. See commit ce4a29c066cddfc180979ed86396812f24337985 49 * (optimize antialias) for how they were created. */ 50 static const int32_t csa_table[8][4] = { 51 { 0x36E129F8, 0xDF128056, 0x15F3AA4E, 0xA831565E }, 52 { 0x386E75F2, 0xE1CF24A5, 0x1A3D9A97, 0xA960AEB3 }, 53 { 0x3CC6B73A, 0xEBF19FA6, 0x28B856E0, 0xAF2AE86C }, 54 { 0x3EEEA054, 0xF45B88BC, 0x334A2910, 0xB56CE868 }, 55 { 0x3FB6905C, 0xF9F27F18, 0x39A90F74, 0xBA3BEEBC }, 56 { 0x3FF23F20, 0xFD60D1E4, 0x3D531104, 0xBD6E92C4 }, 57 { 0x3FFE5932, 0xFF175EE4, 0x3F15B816, 0xBF1905B2 }, 58 { 0x3FFFE34A, 0xFFC3612F, 0x3FC34479, 0xBFC37DE5 } 59 }; 60 61 #include "mpegaudiodec_template.c" 62 63 #if CONFIG_MP1_DECODER 64 const FFCodec ff_mp1_decoder = { 65 .p.name = "mp1", 66 CODEC_LONG_NAME("MP1 (MPEG audio layer 1)"), 67 .p.type = AVMEDIA_TYPE_AUDIO, 68 .p.id = AV_CODEC_ID_MP1, 69 .priv_data_size = sizeof(MPADecodeContext), 70 .init = decode_init, 71 FF_CODEC_DECODE_CB(decode_frame), 72 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 73 AV_CODEC_CAP_DR1, 74 .flush = flush, 75 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 76 AV_SAMPLE_FMT_S16, 77 AV_SAMPLE_FMT_NONE }, 78 }; 79 #endif 80 #if CONFIG_MP2_DECODER 81 const FFCodec ff_mp2_decoder = { 82 .p.name = "mp2", 83 CODEC_LONG_NAME("MP2 (MPEG audio layer 2)"), 84 .p.type = AVMEDIA_TYPE_AUDIO, 85 .p.id = AV_CODEC_ID_MP2, 86 .priv_data_size = sizeof(MPADecodeContext), 87 .init = decode_init, 88 FF_CODEC_DECODE_CB(decode_frame), 89 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 90 AV_CODEC_CAP_DR1, 91 .flush = flush, 92 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 93 AV_SAMPLE_FMT_S16, 94 AV_SAMPLE_FMT_NONE }, 95 }; 96 #endif 97 #if CONFIG_MP3_DECODER 98 const FFCodec ff_mp3_decoder = { 99 .p.name = "mp3", 100 CODEC_LONG_NAME("MP3 (MPEG audio layer 3)"), 101 .p.type = AVMEDIA_TYPE_AUDIO, 102 .p.id = AV_CODEC_ID_MP3, 103 .priv_data_size = sizeof(MPADecodeContext), 104 .init = decode_init, 105 FF_CODEC_DECODE_CB(decode_frame), 106 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 107 AV_CODEC_CAP_DR1, 108 .flush = flush, 109 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 110 AV_SAMPLE_FMT_S16, 111 AV_SAMPLE_FMT_NONE }, 112 }; 113 #endif 114 #if CONFIG_MP3ADU_DECODER 115 const FFCodec ff_mp3adu_decoder = { 116 .p.name = "mp3adu", 117 CODEC_LONG_NAME("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), 118 .p.type = AVMEDIA_TYPE_AUDIO, 119 .p.id = AV_CODEC_ID_MP3ADU, 120 .priv_data_size = sizeof(MPADecodeContext), 121 .init = decode_init, 122 FF_CODEC_DECODE_CB(decode_frame_adu), 123 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 124 AV_CODEC_CAP_DR1, 125 .flush = flush, 126 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 127 AV_SAMPLE_FMT_S16, 128 AV_SAMPLE_FMT_NONE }, 129 }; 130 #endif 131 #if CONFIG_MP3ON4_DECODER 132 const FFCodec ff_mp3on4_decoder = { 133 .p.name = "mp3on4", 134 CODEC_LONG_NAME("MP3onMP4"), 135 .p.type = AVMEDIA_TYPE_AUDIO, 136 .p.id = AV_CODEC_ID_MP3ON4, 137 .priv_data_size = sizeof(MP3On4DecodeContext), 138 .init = decode_init_mp3on4, 139 .close = decode_close_mp3on4, 140 FF_CODEC_DECODE_CB(decode_frame_mp3on4), 141 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 142 AV_CODEC_CAP_DR1, 143 .flush = flush_mp3on4, 144 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 145 AV_SAMPLE_FMT_NONE }, 146 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, 147 }; 148 #endif