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 "internal.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 typedef struct PCMAudioDemuxerContext {
  32     AVClass *class;
  33     int sample_rate;
  34     int channels;
  35 } PCMAudioDemuxerContext;
  36
  37 static int pcm_read_header(AVFormatContext *s)
  38 {
  39     PCMAudioDemuxerContext *s1 = s->priv_data;
  40     AVStream *st;
  41
  42     st = avformat_new_stream(s, NULL);
  43     if (!st)
  44         return AVERROR(ENOMEM);
  45
  46
  47     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  48     st->codec->codec_id    = s->iformat->raw_codec_id;
  49     st->codec->sample_rate = s1->sample_rate;
  50     st->codec->channels    = s1->channels;
  51
  52     st->codec->bits_per_coded_sample =
  53         av_get_bits_per_sample(st->codec->codec_id);
  54
  55     av_assert0(st->codec->bits_per_coded_sample > 0);
  56
  57     st->codec->block_align =
  58         st->codec->bits_per_coded_sample * st->codec->channels / 8;
  59
  60     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  61     return 0;
  62 }
  63
  64 static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
  65 {
  66     int ret, size, bps;
  67     //    AVStream *st = s->streams[0];
  68
  69     size= RAW_SAMPLES*s->streams[0]->codec->block_align;
  70
  71     ret= av_get_packet(s->pb, pkt, size);
  72
  73     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
  74     pkt->stream_index = 0;
  75     if (ret < 0)
  76         return ret;
  77
  78     bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
  79     av_assert1(bps); // if false there IS a bug elsewhere (NOT in this function)
  80     pkt->dts=
  81     pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
  82
  83     return ret;
  84 }
  85
  86 static const AVOption pcm_options[] = {
  87     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  88     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  89     { NULL },
  90 };
  91
  92 #define PCMDEF(name_, long_name_, ext, codec)               \
  93 static const AVClass name_ ## _demuxer_class = {            \
  94     .class_name = #name_ " demuxer",                        \
  95     .item_name  = av_default_item_name,                     \
  96     .option     = pcm_options,                              \
  97     .version    = LIBAVUTIL_VERSION_INT,                    \
  98 };                                                          \
  99 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
 100     .name           = #name_,                               \
 101     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
 102     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
 103     .read_header    = pcm_read_header,                      \
 104     .read_packet    = pcm_read_packet,                      \
 105     .read_seek      = ff_pcm_read_seek,                     \
 106     .flags          = AVFMT_GENERIC_INDEX,                  \
 107     .extensions     = ext,                                  \
 108     .raw_codec_id   = codec,                                \
 109     .priv_class     = &name_ ## _demuxer_class,             \
 110 };
 111
 112 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
 113        NULL, AV_CODEC_ID_PCM_F64BE)
 114
 115 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
 116        NULL, AV_CODEC_ID_PCM_F64LE)
 117
 118 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
 119        NULL, AV_CODEC_ID_PCM_F32BE)
 120
 121 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
 122        NULL, AV_CODEC_ID_PCM_F32LE)
 123
 124 PCMDEF(s32be, "PCM signed 32-bit big-endian",
 125        NULL, AV_CODEC_ID_PCM_S32BE)
 126
 127 PCMDEF(s32le, "PCM signed 32-bit little-endian",
 128        NULL, AV_CODEC_ID_PCM_S32LE)
 129
 130 PCMDEF(s24be, "PCM signed 24-bit big-endian",
 131        NULL, AV_CODEC_ID_PCM_S24BE)
 132
 133 PCMDEF(s24le, "PCM signed 24-bit little-endian",
 134        NULL, AV_CODEC_ID_PCM_S24LE)
 135
 136 PCMDEF(s16be, "PCM signed 16-bit big-endian",
 137        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
 138
 139 PCMDEF(s16le, "PCM signed 16-bit little-endian",
 140        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
 141
 142 PCMDEF(s8, "PCM signed 8-bit",
 143        "sb", AV_CODEC_ID_PCM_S8)
 144
 145 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
 146        NULL, AV_CODEC_ID_PCM_U32BE)
 147
 148 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
 149        NULL, AV_CODEC_ID_PCM_U32LE)
 150
 151 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
 152        NULL, AV_CODEC_ID_PCM_U24BE)
 153
 154 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
 155        NULL, AV_CODEC_ID_PCM_U24LE)
 156
 157 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
 158        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
 159
 160 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
 161        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
 162
 163 PCMDEF(u8, "PCM unsigned 8-bit",
 164        "ub", AV_CODEC_ID_PCM_U8)
 165
 166 PCMDEF(alaw, "PCM A-law",
 167        "al", AV_CODEC_ID_PCM_ALAW)
 168
 169 PCMDEF(mulaw, "PCM mu-law",
 170        "ul", AV_CODEC_ID_PCM_MULAW)