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, little_endian = 0;
  54         size_t len = strlen(s->iformat->mime_type);
  55         if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) { /* audio/L16 */
  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                 if (!little_endian) {
  67                      char val[14]; /* sizeof("little-endian") == 14 */
  68                      if (sscanf(options, " endianness=%13s", val) == 1) {
  69                          little_endian = strcmp(val, "little-endian") == 0;
  70                      }
  71                 }
  72             }
  73             if (rate <= 0) {
  74                 av_log(s, AV_LOG_ERROR,
  75                        "Invalid sample_rate found in mime_type \"%s\"\n",
  76                        mime_type);
  77                 av_freep(&mime_type);
  78                 return AVERROR_INVALIDDATA;
  79             }
  80             st->codecpar->sample_rate = rate;
  81             if (channels > 0)
  82                 st->codecpar->channels = channels;
  83             if (little_endian)
  84                 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
  85         }
  86     }
  87     av_freep(&mime_type);
  88
  89     st->codecpar->bits_per_coded_sample =
  90         av_get_bits_per_sample(st->codecpar->codec_id);
  91
  92     av_assert0(st->codecpar->bits_per_coded_sample > 0);
  93
  94     st->codecpar->block_align =
  95         st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
  96
  97     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
  98     return 0;
  99 }
 100
 101 static const AVOption pcm_options[] = {
 102     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 103     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 104     { NULL },
 105 };
 106
 107 #define PCMDEF(name_, long_name_, ext, codec, ...)          \
 108 static const AVClass name_ ## _demuxer_class = {            \
 109     .class_name = #name_ " demuxer",                        \
 110     .item_name  = av_default_item_name,                     \
 111     .option     = pcm_options,                              \
 112     .version    = LIBAVUTIL_VERSION_INT,                    \
 113 };                                                          \
 114 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
 115     .name           = #name_,                               \
 116     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
 117     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
 118     .read_header    = pcm_read_header,                      \
 119     .read_packet    = ff_pcm_read_packet,                   \
 120     .read_seek      = ff_pcm_read_seek,                     \
 121     .flags          = AVFMT_GENERIC_INDEX,                  \
 122     .extensions     = ext,                                  \
 123     .raw_codec_id   = codec,                                \
 124     .priv_class     = &name_ ## _demuxer_class,             \
 125     __VA_ARGS__                                             \
 126 };
 127
 128 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
 129        NULL, AV_CODEC_ID_PCM_F64BE)
 130
 131 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
 132        NULL, AV_CODEC_ID_PCM_F64LE)
 133
 134 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
 135        NULL, AV_CODEC_ID_PCM_F32BE)
 136
 137 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
 138        NULL, AV_CODEC_ID_PCM_F32LE)
 139
 140 PCMDEF(s32be, "PCM signed 32-bit big-endian",
 141        NULL, AV_CODEC_ID_PCM_S32BE)
 142
 143 PCMDEF(s32le, "PCM signed 32-bit little-endian",
 144        NULL, AV_CODEC_ID_PCM_S32LE)
 145
 146 PCMDEF(s24be, "PCM signed 24-bit big-endian",
 147        NULL, AV_CODEC_ID_PCM_S24BE)
 148
 149 PCMDEF(s24le, "PCM signed 24-bit little-endian",
 150        NULL, AV_CODEC_ID_PCM_S24LE)
 151
 152 PCMDEF(s16be, "PCM signed 16-bit big-endian",
 153        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE, .mime_type = "audio/L16")
 154
 155 PCMDEF(s16le, "PCM signed 16-bit little-endian",
 156        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
 157
 158 PCMDEF(s8, "PCM signed 8-bit",
 159        "sb", AV_CODEC_ID_PCM_S8)
 160
 161 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
 162        NULL, AV_CODEC_ID_PCM_U32BE)
 163
 164 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
 165        NULL, AV_CODEC_ID_PCM_U32LE)
 166
 167 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
 168        NULL, AV_CODEC_ID_PCM_U24BE)
 169
 170 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
 171        NULL, AV_CODEC_ID_PCM_U24LE)
 172
 173 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
 174        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
 175
 176 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
 177        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
 178
 179 PCMDEF(u8, "PCM unsigned 8-bit",
 180        "ub", AV_CODEC_ID_PCM_U8)
 181
 182 PCMDEF(alaw, "PCM A-law",
 183        "al", AV_CODEC_ID_PCM_ALAW)
 184
 185 PCMDEF(mulaw, "PCM mu-law",
 186        "ul", AV_CODEC_ID_PCM_MULAW)
 187
 188 PCMDEF(vidc, "PCM Archimedes VIDC",
 189        NULL, AV_CODEC_ID_PCM_VIDC)
 190
 191 static const AVOption sln_options[] = {
 192     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 193     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 194     { NULL },
 195 };
 196
 197 static const AVClass sln_demuxer_class = {
 198     .class_name = "sln demuxer",
 199     .item_name  = av_default_item_name,
 200     .option     = sln_options,
 201     .version    = LIBAVUTIL_VERSION_INT,
 202 };
 203
 204 AVInputFormat ff_sln_demuxer = {
 205     .name           = "sln",
 206     .long_name      = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
 207     .priv_data_size = sizeof(PCMAudioDemuxerContext),
 208     .read_header    = pcm_read_header,
 209     .read_packet    = ff_pcm_read_packet,
 210     .read_seek      = ff_pcm_read_seek,
 211     .flags          = AVFMT_GENERIC_INDEX,
 212     .extensions     = "sln",
 213     .raw_codec_id   = AV_CODEC_ID_PCM_S16LE,
 214     .priv_class     = &sln_demuxer_class,
 215 };