git.sesse.net Git - ffmpeg/blob - libavformat/pcmdec.c

   1 /*
   2  * RAW PCM demuxers
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23 #include "rawdec.h"
  24 #include "pcm.h"
  25 #include "libavutil/log.h"
  26 #include "libavutil/opt.h"
  27 #include "libavutil/avassert.h"
  28
  29 #define RAW_SAMPLES     1024
  30
  31 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
  32 {
  33     int ret, size, bps;
  34     //    AVStream *st = s->streams[0];
  35
  36     size= RAW_SAMPLES*s->streams[0]->codec->block_align;
  37
  38     ret= av_get_packet(s->pb, pkt, size);
  39
  40     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
  41     pkt->stream_index = 0;
  42     if (ret < 0)
  43         return ret;
  44
  45     bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
  46     av_assert1(bps); // if false there IS a bug elsewhere (NOT in this function)
  47     pkt->dts=
  48     pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
  49
  50     return ret;
  51 }
  52
  53 static const AVOption pcm_options[] = {
  54     { "sample_rate", "", offsetof(RawAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  55     { "channels",    "", offsetof(RawAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  56     { NULL },
  57 };
  58
  59 #define PCMDEF(name_, long_name_, ext, codec)               \
  60 static const AVClass name_ ## _demuxer_class = {            \
  61     .class_name = #name_ " demuxer",                        \
  62     .item_name  = av_default_item_name,                     \
  63     .option     = pcm_options,                              \
  64     .version    = LIBAVUTIL_VERSION_INT,                    \
  65 };                                                          \
  66 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
  67     .name           = #name_,                               \
  68     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
  69     .priv_data_size = sizeof(RawAudioDemuxerContext),       \
  70     .read_header    = ff_raw_read_header,                   \
  71     .read_packet    = raw_read_packet,                      \
  72     .read_seek      = ff_pcm_read_seek,                     \
  73     .flags          = AVFMT_GENERIC_INDEX,                  \
  74     .extensions     = ext,                                  \
  75     .raw_codec_id   = codec,                                \
  76     .priv_class     = &name_ ## _demuxer_class,             \
  77 };
  78
  79 PCMDEF(f64be, "PCM 64 bit floating-point big-endian format",
  80        NULL, CODEC_ID_PCM_F64BE)
  81
  82 PCMDEF(f64le, "PCM 64 bit floating-point little-endian format",
  83        NULL, CODEC_ID_PCM_F64LE)
  84
  85 PCMDEF(f32be, "PCM 32 bit floating-point big-endian format",
  86        NULL, CODEC_ID_PCM_F32BE)
  87
  88 PCMDEF(f32le, "PCM 32 bit floating-point little-endian format",
  89        NULL, CODEC_ID_PCM_F32LE)
  90
  91 PCMDEF(s32be, "PCM signed 32 bit big-endian format",
  92        NULL, CODEC_ID_PCM_S32BE)
  93
  94 PCMDEF(s32le, "PCM signed 32 bit little-endian format",
  95        NULL, CODEC_ID_PCM_S32LE)
  96
  97 PCMDEF(s24be, "PCM signed 24 bit big-endian format",
  98        NULL, CODEC_ID_PCM_S24BE)
  99
 100 PCMDEF(s24le, "PCM signed 24 bit little-endian format",
 101        NULL, CODEC_ID_PCM_S24LE)
 102
 103 PCMDEF(s16be, "PCM signed 16 bit big-endian format",
 104        AV_NE("sw", NULL), CODEC_ID_PCM_S16BE)
 105
 106 PCMDEF(s16le, "PCM signed 16 bit little-endian format",
 107        AV_NE(NULL, "sw"), CODEC_ID_PCM_S16LE)
 108
 109 PCMDEF(s8, "PCM signed 8 bit format",
 110        "sb", CODEC_ID_PCM_S8)
 111
 112 PCMDEF(u32be, "PCM unsigned 32 bit big-endian format",
 113        NULL, CODEC_ID_PCM_U32BE)
 114
 115 PCMDEF(u32le, "PCM unsigned 32 bit little-endian format",
 116        NULL, CODEC_ID_PCM_U32LE)
 117
 118 PCMDEF(u24be, "PCM unsigned 24 bit big-endian format",
 119        NULL, CODEC_ID_PCM_U24BE)
 120
 121 PCMDEF(u24le, "PCM unsigned 24 bit little-endian format",
 122        NULL, CODEC_ID_PCM_U24LE)
 123
 124 PCMDEF(u16be, "PCM unsigned 16 bit big-endian format",
 125        AV_NE("uw", NULL), CODEC_ID_PCM_U16BE)
 126
 127 PCMDEF(u16le, "PCM unsigned 16 bit little-endian format",
 128        AV_NE(NULL, "uw"), CODEC_ID_PCM_U16LE)
 129
 130 PCMDEF(u8, "PCM unsigned 8 bit format",
 131        "ub", CODEC_ID_PCM_U8)
 132
 133 PCMDEF(alaw, "PCM A-law format",
 134        "al", CODEC_ID_PCM_ALAW)
 135
 136 PCMDEF(mulaw, "PCM mu-law format",
 137        "ul", CODEC_ID_PCM_MULAW)