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 #include "mpegaudiodec_template.c" 40 41 #if CONFIG_MP1_DECODER 42 AVCodec ff_mp1_decoder = { 43 .name = "mp1", 44 .long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), 45 .type = AVMEDIA_TYPE_AUDIO, 46 .id = AV_CODEC_ID_MP1, 47 .priv_data_size = sizeof(MPADecodeContext), 48 .init = decode_init, 49 .decode = decode_frame, 50 .capabilities = AV_CODEC_CAP_DR1, 51 .flush = flush, 52 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 53 AV_SAMPLE_FMT_S16, 54 AV_SAMPLE_FMT_NONE }, 55 }; 56 #endif 57 #if CONFIG_MP2_DECODER 58 AVCodec ff_mp2_decoder = { 59 .name = "mp2", 60 .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), 61 .type = AVMEDIA_TYPE_AUDIO, 62 .id = AV_CODEC_ID_MP2, 63 .priv_data_size = sizeof(MPADecodeContext), 64 .init = decode_init, 65 .decode = decode_frame, 66 .capabilities = AV_CODEC_CAP_DR1, 67 .flush = flush, 68 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 69 AV_SAMPLE_FMT_S16, 70 AV_SAMPLE_FMT_NONE }, 71 }; 72 #endif 73 #if CONFIG_MP3_DECODER 74 AVCodec ff_mp3_decoder = { 75 .name = "mp3", 76 .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), 77 .type = AVMEDIA_TYPE_AUDIO, 78 .id = AV_CODEC_ID_MP3, 79 .priv_data_size = sizeof(MPADecodeContext), 80 .init = decode_init, 81 .decode = decode_frame, 82 .capabilities = AV_CODEC_CAP_DR1, 83 .flush = flush, 84 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 85 AV_SAMPLE_FMT_S16, 86 AV_SAMPLE_FMT_NONE }, 87 }; 88 #endif 89 #if CONFIG_MP3ADU_DECODER 90 AVCodec ff_mp3adu_decoder = { 91 .name = "mp3adu", 92 .long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), 93 .type = AVMEDIA_TYPE_AUDIO, 94 .id = AV_CODEC_ID_MP3ADU, 95 .priv_data_size = sizeof(MPADecodeContext), 96 .init = decode_init, 97 .decode = decode_frame_adu, 98 .capabilities = AV_CODEC_CAP_DR1, 99 .flush = flush, 100 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 101 AV_SAMPLE_FMT_S16, 102 AV_SAMPLE_FMT_NONE }, 103 }; 104 #endif 105 #if CONFIG_MP3ON4_DECODER 106 AVCodec ff_mp3on4_decoder = { 107 .name = "mp3on4", 108 .long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"), 109 .type = AVMEDIA_TYPE_AUDIO, 110 .id = AV_CODEC_ID_MP3ON4, 111 .priv_data_size = sizeof(MP3On4DecodeContext), 112 .init = decode_init_mp3on4, 113 .close = decode_close_mp3on4, 114 .decode = decode_frame_mp3on4, 115 .capabilities = AV_CODEC_CAP_DR1, 116 .flush = flush_mp3on4, 117 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, 118 AV_SAMPLE_FMT_NONE }, 119 }; 120 #endif 121