git.sesse.net Git - ffmpeg/blob - libavcodec/mpegaudiodec_fixed.c

   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_CHANNEL_CONF |
  51                       AV_CODEC_CAP_DR1,
  52     .flush          = flush,
  53     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
  54                                                       AV_SAMPLE_FMT_S16,
  55                                                       AV_SAMPLE_FMT_NONE },
  56     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
  57 };
  58 #endif
  59 #if CONFIG_MP2_DECODER
  60 AVCodec ff_mp2_decoder = {
  61     .name           = "mp2",
  62     .long_name      = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
  63     .type           = AVMEDIA_TYPE_AUDIO,
  64     .id             = AV_CODEC_ID_MP2,
  65     .priv_data_size = sizeof(MPADecodeContext),
  66     .init           = decode_init,
  67     .decode         = decode_frame,
  68     .capabilities   = AV_CODEC_CAP_CHANNEL_CONF |
  69                       AV_CODEC_CAP_DR1,
  70     .flush          = flush,
  71     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
  72                                                       AV_SAMPLE_FMT_S16,
  73                                                       AV_SAMPLE_FMT_NONE },
  74     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
  75 };
  76 #endif
  77 #if CONFIG_MP3_DECODER
  78 AVCodec ff_mp3_decoder = {
  79     .name           = "mp3",
  80     .long_name      = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
  81     .type           = AVMEDIA_TYPE_AUDIO,
  82     .id             = AV_CODEC_ID_MP3,
  83     .priv_data_size = sizeof(MPADecodeContext),
  84     .init           = decode_init,
  85     .decode         = decode_frame,
  86     .capabilities   = AV_CODEC_CAP_CHANNEL_CONF |
  87                       AV_CODEC_CAP_DR1,
  88     .flush          = flush,
  89     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
  90                                                       AV_SAMPLE_FMT_S16,
  91                                                       AV_SAMPLE_FMT_NONE },
  92     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
  93 };
  94 #endif
  95 #if CONFIG_MP3ADU_DECODER
  96 AVCodec ff_mp3adu_decoder = {
  97     .name           = "mp3adu",
  98     .long_name      = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
  99     .type           = AVMEDIA_TYPE_AUDIO,
 100     .id             = AV_CODEC_ID_MP3ADU,
 101     .priv_data_size = sizeof(MPADecodeContext),
 102     .init           = decode_init,
 103     .decode         = decode_frame_adu,
 104     .capabilities   = AV_CODEC_CAP_CHANNEL_CONF |
 105                       AV_CODEC_CAP_DR1,
 106     .flush          = flush,
 107     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
 108                                                       AV_SAMPLE_FMT_S16,
 109                                                       AV_SAMPLE_FMT_NONE },
 110     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 111 };
 112 #endif
 113 #if CONFIG_MP3ON4_DECODER
 114 AVCodec ff_mp3on4_decoder = {
 115     .name           = "mp3on4",
 116     .long_name      = NULL_IF_CONFIG_SMALL("MP3onMP4"),
 117     .type           = AVMEDIA_TYPE_AUDIO,
 118     .id             = AV_CODEC_ID_MP3ON4,
 119     .priv_data_size = sizeof(MP3On4DecodeContext),
 120     .init           = decode_init_mp3on4,
 121     .close          = decode_close_mp3on4,
 122     .decode         = decode_frame_mp3on4,
 123     .capabilities   = AV_CODEC_CAP_CHANNEL_CONF |
 124                       AV_CODEC_CAP_DR1,
 125     .flush          = flush_mp3on4,
 126     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
 127                                                       AV_SAMPLE_FMT_NONE },
 128     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 129 };
 130 #endif