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  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)       ((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
  121.