libavformat/pcmdec.c

   1 /*
   2  * RAW PCM demuxers
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 "internal.h"
  24 #include "pcm.h"
  25 #include "libavutil/log.h"
  26 #include "libavutil/opt.h"
  27
  28 #define RAW_SAMPLES     1024
  29
  30 typedef struct PCMAudioDemuxerContext {
  31     AVClass *class;
  32     int sample_rate;
  33     int channels;
  34 } PCMAudioDemuxerContext;
  35
  36 static int pcm_read_header(AVFormatContext *s)
  37 {
  38     PCMAudioDemuxerContext *s1 = s->priv_data;
  39     AVStream *st;
  40
  41     st = avformat_new_stream(s, NULL);
  42     if (!st)
  43         return AVERROR(ENOMEM);
  44
  45
  46     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  47     st->codec->codec_id    = s->iformat->raw_codec_id;
  48     st->codec->sample_rate = s1->sample_rate;
  49     st->codec->channels    = s1->channels;
  50
  51     st->codec->bits_per_coded_sample =
  52         av_get_bits_per_sample(st->codec->codec_id);
  53
  54     assert(st->codec->bits_per_coded_sample > 0);
  55
  56     st->codec->block_align =
  57         st->codec->bits_per_coded_sample * st->codec->channels / 8;
  58
  59     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  60     return 0;
  61 }
  62
  63 static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
  64 {
  65     int ret, size, bps;
  66     //    AVStream *st = s->streams[0];
  67
  68     size= RAW_SAMPLES*s->streams[0]->codec->block_align;
  69
  70     ret= av_get_packet(s->pb, pkt, size);
  71
  72     pkt->stream_index = 0;
  73     if (ret < 0)
  74         return ret;
  75
  76     bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
  77     assert(bps); // if false there IS a bug elsewhere (NOT in this function)
  78     pkt->dts=
  79     pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
  80
  81     return ret;
  82 }
  83
  84 static const AVOption pcm_options[] = {
  85     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  86     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  87     { NULL },
  88 };
  89
  90 #define PCMDEF(name_, long_name_, ext, codec)               \
  91 static const AVClass name_ ## _demuxer_class = {            \
  92     .class_name = #name_ " demuxer",                        \
  93     .item_name  = av_default_item_name,                     \
  94     .option     = pcm_options,                              \
  95     .version    = LIBAVUTIL_VERSION_INT,                    \
  96 };                                                          \
  97 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
  98     .name           = #name_,                               \
  99     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
 100     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
 101     .read_header    = pcm_read_header,                      \
 102     .read_packet    = pcm_read_packet,                      \
 103     .read_seek      = ff_pcm_read_seek,                     \
 104     .flags          = AVFMT_GENERIC_INDEX,                  \
 105     .extensions     = ext,                                  \
 106     .raw_codec_id   = codec,                                \
 107     .priv_class     = &name_ ## _demuxer_class,             \
 108 };
 109
 110 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
 111        NULL, AV_CODEC_ID_PCM_F64BE)
 112
 113 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
 114        NULL, AV_CODEC_ID_PCM_F64LE)
 115
 116 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
 117        NULL, AV_CODEC_ID_PCM_F32BE)
 118
 119 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
 120        NULL, AV_CODEC_ID_PCM_F32LE)
 121
 122 PCMDEF(s32be, "PCM signed 32-bit big-endian",
 123        NULL, AV_CODEC_ID_PCM_S32BE)
 124
 125 PCMDEF(s32le, "PCM signed 32-bit little-endian",
 126        NULL, AV_CODEC_ID_PCM_S32LE)
 127
 128 PCMDEF(s24be, "PCM signed 24-bit big-endian",
 129        NULL, AV_CODEC_ID_PCM_S24BE)
 130
 131 PCMDEF(s24le, "PCM signed 24-bit little-endian",
 132        NULL, AV_CODEC_ID_PCM_S24LE)
 133
 134 PCMDEF(s16be, "PCM signed 16-bit big-endian",
 135        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
 136
 137 PCMDEF(s16le, "PCM signed 16-bit little-endian",
 138        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
 139
 140 PCMDEF(s8, "PCM signed 8-bit",
 141        "sb", AV_CODEC_ID_PCM_S8)
 142
 143 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
 144        NULL, AV_CODEC_ID_PCM_U32BE)
 145
 146 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
 147        NULL, AV_CODEC_ID_PCM_U32LE)
 148
 149 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
 150        NULL, AV_CODEC_ID_PCM_U24BE)
 151
 152 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
 153        NULL, AV_CODEC_ID_PCM_U24LE)
 154
 155 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
 156        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
 157
 158 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
 159        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
 160
 161 PCMDEF(u8, "PCM unsigned 8-bit",
 162        "ub", AV_CODEC_ID_PCM_U8)
 163
 164 PCMDEF(alaw, "PCM A-law",
 165        "al", AV_CODEC_ID_PCM_ALAW)
 166
 167 PCMDEF(mulaw, "PCM mu-law",
 168        "ul", AV_CODEC_ID_PCM_MULAW)