libavformat/oggparsespeex.c

   1 /*
   2       Copyright (C) 2008  Reimar Döffinger
   3
   4       Permission is hereby granted, free of charge, to any person
   5       obtaining a copy of this software and associated documentation
   6       files (the "Software"), to deal in the Software without
   7       restriction, including without limitation the rights to use, copy,
   8       modify, merge, publish, distribute, sublicense, and/or sell copies
   9       of the Software, and to permit persons to whom the Software is
  10       furnished to do so, subject to the following conditions:
  11
  12       The above copyright notice and this permission notice shall be
  13       included in all copies or substantial portions of the Software.
  14
  15       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16       EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18       NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19       HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20       WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21       OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22       DEALINGS IN THE SOFTWARE.
  23 **/
  24
  25 #include <stdlib.h>
  26 #include "libavutil/bswap.h"
  27 #include "libavutil/avstring.h"
  28 #include "libavcodec/get_bits.h"
  29 #include "libavcodec/bytestream.h"
  30 #include "avformat.h"
  31 #include "oggdec.h"
  32
  33 static int speex_header(AVFormatContext *s, int idx) {
  34     struct ogg *ogg = s->priv_data;
  35     struct ogg_stream *os = ogg->streams + idx;
  36     AVStream *st = s->streams[idx];
  37     uint8_t *p = os->buf + os->pstart;
  38
  39     if (os->seq > 1)
  40         return 0;
  41
  42     if (os->seq == 0) {
  43         int frames_per_packet;
  44         st->codec->codec_type = CODEC_TYPE_AUDIO;
  45         st->codec->codec_id = CODEC_ID_SPEEX;
  46
  47         st->codec->sample_rate = AV_RL32(p + 36);
  48         st->codec->channels = AV_RL32(p + 48);
  49
  50         /* We treat the whole Speex packet as a single frame everywhere Speex
  51            is handled in FFmpeg.  This avoids the complexities of splitting
  52            and joining individual Speex frames, which are not always
  53            byte-aligned. */
  54         st->codec->frame_size = AV_RL32(p + 56);
  55         frames_per_packet     = AV_RL32(p + 64);
  56         if (frames_per_packet)
  57             st->codec->frame_size *= frames_per_packet;
  58
  59         st->codec->extradata_size = os->psize;
  60         st->codec->extradata = av_malloc(st->codec->extradata_size
  61                                          + FF_INPUT_BUFFER_PADDING_SIZE);
  62         memcpy(st->codec->extradata, p, st->codec->extradata_size);
  63
  64         st->time_base.num = 1;
  65         st->time_base.den = st->codec->sample_rate;
  66     } else
  67         vorbis_comment(s, p, os->psize);
  68
  69     return 1;
  70 }
  71
  72 const struct ogg_codec ff_speex_codec = {
  73     .magic = "Speex   ",
  74     .magicsize = 8,
  75     .header = speex_header
  76 };