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 "config_components.h"
  23
  24 #include "libavutil/avstring.h"
  25 #include "libavutil/channel_layout.h"
  26 #include "libavutil/mem.h"
  27 #include "avformat.h"
  28 #include "demux.h"
  29 #include "internal.h"
  30 #include "pcm.h"
  31 #include "libavutil/log.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/avassert.h"
  34
  35 typedef struct PCMAudioDemuxerContext {
  36     AVClass *class;
  37     int sample_rate;
  38     AVChannelLayout ch_layout;
  39 } PCMAudioDemuxerContext;
  40
  41 static int pcm_read_header(AVFormatContext *s)
  42 {
  43     PCMAudioDemuxerContext *s1 = s->priv_data;
  44     AVCodecParameters *par;
  45     AVStream *st;
  46     uint8_t *mime_type = NULL;
  47     int ret;
  48
  49     st = avformat_new_stream(s, NULL);
  50     if (!st)
  51         return AVERROR(ENOMEM);
  52     par = st->codecpar;
  53
  54     par->codec_type  = AVMEDIA_TYPE_AUDIO;
  55     par->codec_id    = ffifmt(s->iformat)->raw_codec_id;
  56     par->sample_rate = s1->sample_rate;
  57     ret = av_channel_layout_copy(&par->ch_layout, &s1->ch_layout);
  58     if (ret < 0)
  59         return ret;
  60
  61     av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
  62     if (mime_type && s->iformat->mime_type) {
  63         int rate = 0, channels = 0, little_endian = 0;
  64         const char *options;
  65         if (av_stristart(mime_type, s->iformat->mime_type, &options)) { /* audio/L16 */
  66             while (options = strchr(options, ';')) {
  67                 options++;
  68                 if (!rate)
  69                     sscanf(options, " rate=%d",     &rate);
  70                 if (!channels)
  71                     sscanf(options, " channels=%d", &channels);
  72                 if (!little_endian) {
  73                      char val[sizeof("little-endian")];
  74                      if (sscanf(options, " endianness=%13s", val) == 1) {
  75                          little_endian = strcmp(val, "little-endian") == 0;
  76                      }
  77                 }
  78             }
  79             if (rate <= 0) {
  80                 av_log(s, AV_LOG_ERROR,
  81                        "Invalid sample_rate found in mime_type \"%s\"\n",
  82                        mime_type);
  83                 av_freep(&mime_type);
  84                 return AVERROR_INVALIDDATA;
  85             }
  86             par->sample_rate = rate;
  87             if (channels > 0) {
  88                 av_channel_layout_uninit(&par->ch_layout);
  89                 par->ch_layout.nb_channels = channels;
  90             }
  91             if (little_endian)
  92                 par->codec_id = AV_CODEC_ID_PCM_S16LE;
  93         }
  94     }
  95     av_freep(&mime_type);
  96
  97     par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
  98
  99     av_assert0(par->bits_per_coded_sample > 0);
 100
 101     par->block_align = par->bits_per_coded_sample * par->ch_layout.nb_channels / 8;
 102
 103     avpriv_set_pts_info(st, 64, 1, par->sample_rate);
 104     return 0;
 105 }
 106
 107 static const AVOption pcm_options[] = {
 108     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 109     { "ch_layout",   "", offsetof(PCMAudioDemuxerContext, ch_layout),   AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
 110     { NULL },
 111 };
 112 static const AVClass pcm_demuxer_class = {
 113     .class_name = "pcm demuxer",
 114     .item_name  = av_default_item_name,
 115     .option     = pcm_options,
 116     .version    = LIBAVUTIL_VERSION_INT,
 117 };
 118
 119 #define PCMDEF_0(name_, long_name_, ext, codec, ...)
 120 #define PCMDEF_1(name_, long_name_, ext, codec, ...)        \
 121 const FFInputFormat ff_pcm_ ## name_ ## _demuxer = {        \
 122     .p.name         = #name_,                               \
 123     .p.long_name    = NULL_IF_CONFIG_SMALL(long_name_),     \
 124     .p.flags        = AVFMT_GENERIC_INDEX,                  \
 125     .p.extensions   = ext,                                  \
 126     .p.priv_class   = &pcm_demuxer_class,                   \
 127     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
 128     .read_header    = pcm_read_header,                      \
 129     .read_packet    = ff_pcm_read_packet,                   \
 130     .read_seek      = ff_pcm_read_seek,                     \
 131     .raw_codec_id   = codec,                                \
 132     __VA_ARGS__                                             \
 133 };
 134 #define PCMDEF_2(name, long_name, ext, codec, enabled, ...) \
 135     PCMDEF_ ## enabled(name, long_name, ext, codec, __VA_ARGS__)
 136 #define PCMDEF_3(name, long_name, ext, codec, config, ...)  \
 137     PCMDEF_2(name, long_name, ext, codec, config,   __VA_ARGS__)
 138 #define PCMDEF_EXT(name, long_name, ext, uppercase, ...)    \
 139     PCMDEF_3(name, long_name, ext, AV_CODEC_ID_PCM_ ## uppercase, \
 140              CONFIG_PCM_ ## uppercase ## _DEMUXER,  __VA_ARGS__)
 141 #define PCMDEF(name, long_name, ext, uppercase)             \
 142     PCMDEF_EXT(name, long_name, ext, uppercase, )
 143
 144 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",           NULL, F64BE)
 145 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",        NULL, F64LE)
 146 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",           NULL, F32BE)
 147 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",        NULL, F32LE)
 148 PCMDEF(s32be, "PCM signed 32-bit big-endian",                   NULL, S32BE)
 149 PCMDEF(s32le, "PCM signed 32-bit little-endian",                NULL, S32LE)
 150 PCMDEF(s24be, "PCM signed 24-bit big-endian",                   NULL, S24BE)
 151 PCMDEF(s24le, "PCM signed 24-bit little-endian",                NULL, S24LE)
 152 PCMDEF_EXT(s16be, "PCM signed 16-bit big-endian",
 153            AV_NE("sw", NULL), S16BE, .p.mime_type = "audio/L16")
 154 PCMDEF(s16le, "PCM signed 16-bit little-endian",   AV_NE(NULL, "sw"), S16LE)
 155 PCMDEF(s8,    "PCM signed 8-bit",                               "sb",    S8)
 156 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",                 NULL, U32BE)
 157 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",              NULL, U32LE)
 158 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",                 NULL, U24BE)
 159 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",              NULL, U24LE)
 160 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",    AV_NE("uw", NULL), U16BE)
 161 PCMDEF(u16le, "PCM unsigned 16-bit little-endian", AV_NE(NULL, "uw"), U16LE)
 162 PCMDEF(u8,    "PCM unsigned 8-bit",                             "ub",    U8)
 163 PCMDEF(alaw,  "PCM A-law",                                      "al",  ALAW)
 164 PCMDEF(mulaw, "PCM mu-law",                                     "ul", MULAW)
 165 PCMDEF(vidc,  "PCM Archimedes VIDC",                            NULL,  VIDC)
 166
 167 #if CONFIG_SLN_DEMUXER
 168 static const AVOption sln_options[] = {
 169     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
 170     { "ch_layout",   "", offsetof(PCMAudioDemuxerContext, ch_layout),   AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
 171     { NULL },
 172 };
 173
 174 static const AVClass sln_demuxer_class = {
 175     .class_name = "sln demuxer",
 176     .item_name  = av_default_item_name,
 177     .option     = sln_options,
 178     .version    = LIBAVUTIL_VERSION_INT,
 179 };
 180
 181 const FFInputFormat ff_sln_demuxer = {
 182     .p.name         = "sln",
 183     .p.long_name    = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
 184     .p.flags        = AVFMT_GENERIC_INDEX,
 185     .p.extensions   = "sln",
 186     .p.priv_class   = &sln_demuxer_class,
 187     .priv_data_size = sizeof(PCMAudioDemuxerContext),
 188     .read_header    = pcm_read_header,
 189     .read_packet    = ff_pcm_read_packet,
 190     .read_seek      = ff_pcm_read_seek,
 191     .raw_codec_id   = AV_CODEC_ID_PCM_S16LE,
 192 };
 193 #endif