libavcodec/mpegaudiodec_fixed.c

   1 /*
   2  * Fixed-point MPEG audio decoder
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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 CONFIG_FLOAT 0
  25
  26 #include "mpegaudio.h"
  27
  28 #define SHR(a,b)       ((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(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