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 typedef struct PCMAudioDemuxerContext {
  30     AVClass *class;
  31     int sample_rate;
  32     int channels;
  33 } PCMAudioDemuxerContext;
  34
  35 static int pcm_read_header(AVFormatContext *s)
  36 {
  37     PCMAudioDemuxerContext *s1 = s->priv_data;
  38     AVStream *st;
  39     uint8_t *mime_type = NULL;
  40
  41     st = avformat_new_stream(s, NULL);
  42     if (!st)
  43         return AVERROR(ENOMEM);
  44
  45
  46     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
  47     st->codecpar->codec_id    = s->iformat->raw_codec_id;
  48     st->codecpar->sample_rate = s1->sample_rate;
  49     st->codecpar->channels    = s1->channels;
  50
  51     av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
  52     if (mime_type && s->iformat->mime_type) {
  53         int rate = 0, channels = 0;
  54         size_t len = strlen(s->iformat->mime_type);
  55         if (!strncmp(s->iformat->mime_type, mime_type, len)) {
  56             uint8_t *options = mime_type + len;
  57             len = strlen(mime_type);
  58             while (options < mime_type + len) {
  59                 options = strstr(options, ";");
  60                 if (!options++)
  61                     break;
  62                 if (!rate)
  63                     sscanf(options, " rate=%d",     &rate);
  64                 if (!channels)
  65                     sscanf(options, " channels=%d", &channels);
  66             }
  67             if (rate <= 0) {
  68                 av_log(s, AV_LOG_ERROR,
  69                        "Invalid sample_rate found in mime_type \"%s\"\n",
  70                        mime_type);
  71                 return AVERROR_INVALIDDATA;
  72             }
  73             st->codecpar->sample_rate = rate;
  74             if (channels > 0)
  75                 st->codecpar->channels = channels;
  76         }
  77     }
  78
  79     st->codecpar->bits_per_coded_sample =
  80         av_get_bits_per_sample(st->codecpar->codec_id);
  81
  82     av_assert0(st->codecpar->bits_per_coded_sample > 0);
  83
  84     st->codecpar->block_align =
  85         st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
  86
  87     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
  88     return 0;
  89 }
  90
  91 static const AVOption pcm_options[] = {
  92     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  93     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  94     { NULL },
  95 };
  96
  97 #define PCMDEF(name_, long_name_, ext, codec, ...)          \
  98 static const AVClass name_ ## _demuxer_class = {            \
  99     .class_name = #name_ " demuxer",                        \
 100     .item_name  = av_default_item_name,                     \
 101     .option     = pcm_options,                              \
 102     .version    = LIBAVUTIL_VERSION_INT,                    \
 103 };                                                          \
 104 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
 105     .name           = #name_,                               \
 106     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
 107     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
 108     .read_header    = pcm_read_header,                      \
 109     .read_packet    = ff_pcm_read_packet,                   \
 110     .read_seek      = ff_pcm_read_seek,                     \
 111     .flags          = AVFMT_GENERIC_INDEX,                  \
 112     .extensions     = ext,                                  \
 113     .raw_codec_id   = codec,                                \
 114     .priv_class     = &name_ ## _demuxer_class,             \
 115     __VA_ARGS__                                             \
 116 };
 117
 118 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
 119        NULL, AV_CODEC_ID_PCM_F64BE)
 120
 121 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
 122        NULL, AV_CODEC_ID_PCM_F64LE)
 123
 124 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
 125        NULL, AV_CODEC_ID_PCM_F32BE)
 126
 127 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
 128        NULL, AV_CODEC_ID_PCM_F32LE)
 129
 130 PCMDEF(s32be, "PCM signed 32-bit big-endian",
 131        NULL, AV_CODEC_ID_PCM_S32BE)
 132
 133 PCMDEF(s32le, "PCM signed 32-bit little-endian",
 134        NULL, AV_CODEC_ID_PCM_S32LE)
 135
 136 PCMDEF(s24be, "PCM signed 24-bit big-endian",
 137        NULL, AV_CODEC_ID_PCM_S24BE)
 138
 139 PCMDEF(s24le, "PCM signed 24-bit little-endian",
 140        NULL, AV_CODEC_ID_PCM_S24LE)
 141
 142 PCMDEF(s16be, "PCM signed 16-bit big-endian",
 143        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
 144
 145 PCMDEF(s16le, "PCM signed 16-bit little-endian",
 146        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE, .mime_type = "audio/L16",)
 147
 148 PCMDEF(s8, "PCM signed 8-bit",
 149        "sb", AV_CODEC_ID_PCM_S8)
 150
 151 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
 152        NULL, AV_CODEC_ID_PCM_U32BE)
 153
 154 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
 155        NULL, AV_CODEC_ID_PCM_U32LE)
 156
 157 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
 158        NULL, AV_CODEC_ID_PCM_U24BE)
 159
 160 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
 161        NULL, AV_CODEC_ID_PCM_U24LE)
 162
 163 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
 164        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
 165
 166 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
 167        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
 168
 169 PCMDEF(u8, "PCM unsigned 8-bit",
 170        "ub", AV_CODEC_ID_PCM_U8)
 171
 172 PCMDEF(alaw, "PCM A-law",
 173        "al", AV_CODEC_ID_PCM_ALAW)
 174
 175 PCMDEF(mulaw, "PCM mu-law",
 176        "ul", AV_CODEC_ID_PCM_MULAW)
 177
 178 static const AVOption sln_options[] = {
 179     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 180     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 181     { NULL },
 182 };
 183
 184 static const AVClass sln_demuxer_class = {
 185     .class_name = "sln demuxer",
 186     .item_name  = av_default_item_name,
 187     .option     = sln_options,
 188     .version    = LIBAVUTIL_VERSION_INT,
 189 };
 190
 191 AVInputFormat ff_sln_demuxer = {
 192     .name           = "sln",
 193     .long_name      = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
 194     .priv_data_size = sizeof(PCMAudioDemuxerContext),
 195     .read_header    = pcm_read_header,
 196     .read_packet    = ff_pcm_read_packet,
 197     .read_seek      = ff_pcm_read_seek,
 198     .flags          = AVFMT_GENERIC_INDEX,
 199     .extensions     = "sln",
 200     .raw_codec_id   = AV_CODEC_ID_PCM_S16LE,
 201     .priv_class     = &sln_demuxer_class,
 202 };