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  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 "libavutil/channel_layout.h"
  29. #include "libavcodec/get_bits.h"
  30. #include "libavcodec/bytestream.h"
  31. #include "avformat.h"
  32. #include "internal.h"
  33. #include "oggdec.h"
  34.  
  35. struct speex_params {
  36.     int packet_size;
  37.     int final_packet_duration;
  38.     int seq;
  39. };
  40.  
  41. static int speex_header(AVFormatContext *s, int idx) {
  42.     struct ogg *ogg = s->priv_data;
  43.     struct ogg_stream *os = ogg->streams + idx;
  44.     struct speex_params *spxp = os->private;
  45.     AVStream *st = s->streams[idx];
  46.     uint8_t *p = os->buf + os->pstart;
  47.  
  48.     if (!spxp) {
  49.         spxp = av_mallocz(sizeof(*spxp));
  50.         os->private = spxp;
  51.     }
  52.  
  53.     if (spxp->seq > 1)
  54.         return 0;
  55.  
  56.     if (spxp->seq == 0) {
  57.         int frames_per_packet;
  58.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  59.         st->codec->codec_id = AV_CODEC_ID_SPEEX;
  60.  
  61.         if (os->psize < 68) {
  62.             av_log(s, AV_LOG_ERROR, "speex packet too small\n");
  63.             return AVERROR_INVALIDDATA;
  64.         }
  65.  
  66.         st->codec->sample_rate = AV_RL32(p + 36);
  67.         st->codec->channels = AV_RL32(p + 48);
  68.         if (st->codec->channels < 1 || st->codec->channels > 2) {
  69.             av_log(s, AV_LOG_ERROR, "invalid channel count. Speex must be mono or stereo.\n");
  70.             return AVERROR_INVALIDDATA;
  71.         }
  72.         st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO :
  73.                                                                AV_CH_LAYOUT_STEREO;
  74.  
  75.         spxp->packet_size  = AV_RL32(p + 56);
  76.         frames_per_packet  = AV_RL32(p + 64);
  77.         if (frames_per_packet)
  78.             spxp->packet_size *= frames_per_packet;
  79.  
  80.         if (ff_alloc_extradata(st->codec, os->psize) < 0)
  81.             return AVERROR(ENOMEM);
  82.         memcpy(st->codec->extradata, p, st->codec->extradata_size);
  83.  
  84.         avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  85.     } else
  86.         ff_vorbis_comment(s, &st->metadata, p, os->psize);
  87.  
  88.     spxp->seq++;
  89.     return 1;
  90. }
  91.  
  92. static int ogg_page_packets(struct ogg_stream *os)
  93. {
  94.     int i;
  95.     int packets = 0;
  96.     for (i = 0; i < os->nsegs; i++)
  97.         if (os->segments[i] < 255)
  98.             packets++;
  99.     return packets;
  100. }
  101.  
  102. static int speex_packet(AVFormatContext *s, int idx)
  103. {
  104.     struct ogg *ogg = s->priv_data;
  105.     struct ogg_stream *os = ogg->streams + idx;
  106.     struct speex_params *spxp = os->private;
  107.     int packet_size = spxp->packet_size;
  108.  
  109.     if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
  110.         os->granule > 0) {
  111.         /* first packet of final page. we have to calculate the final packet
  112.            duration here because it is the only place we know the next-to-last
  113.            granule position. */
  114.         spxp->final_packet_duration = os->granule - os->lastpts -
  115.                                       packet_size * (ogg_page_packets(os) - 1);
  116.     }
  117.  
  118.     if (!os->lastpts && os->granule > 0)
  119.         /* first packet */
  120.         os->lastpts = os->lastdts = os->granule - packet_size *
  121.                                     ogg_page_packets(os);
  122.     if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
  123.         spxp->final_packet_duration)
  124.         /* final packet */
  125.         os->pduration = spxp->final_packet_duration;
  126.     else
  127.         os->pduration = packet_size;
  128.  
  129.     return 0;
  130. }
  131.  
  132. const struct ogg_codec ff_speex_codec = {
  133.     .magic = "Speex   ",
  134.     .magicsize = 8,
  135.     .header = speex_header,
  136.     .packet = speex_packet,
  137.     .nb_header = 2,
  138. };
  139.