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 /* 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 const 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 const 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 const 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 const 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 const 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