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 "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         st->codec->sample_rate = AV_RL32(p + 36);
  62         st->codec->channels = AV_RL32(p + 48);
  63         if (st->codec->channels < 1 || st->codec->channels > 2) {
  64             av_log(s, AV_LOG_ERROR, "invalid channel count. Speex must be mono or stereo.\n");
  65             return AVERROR_INVALIDDATA;
  66         }
  67         st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO :
  68                                                                AV_CH_LAYOUT_STEREO;
  69
  70         spxp->packet_size  = AV_RL32(p + 56);
  71         frames_per_packet  = AV_RL32(p + 64);
  72         if (frames_per_packet)
  73             spxp->packet_size *= frames_per_packet;
  74
  75         st->codec->extradata_size = os->psize;
  76         st->codec->extradata = av_malloc(st->codec->extradata_size
  77                                          + FF_INPUT_BUFFER_PADDING_SIZE);
  78         memcpy(st->codec->extradata, p, st->codec->extradata_size);
  79
  80         avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  81     } else
  82         ff_vorbis_comment(s, &st->metadata, p, os->psize);
  83
  84     spxp->seq++;
  85     return 1;
  86 }
  87
  88 static int ogg_page_packets(struct ogg_stream *os)
  89 {
  90     int i;
  91     int packets = 0;
  92     for (i = 0; i < os->nsegs; i++)
  93         if (os->segments[i] < 255)
  94             packets++;
  95     return packets;
  96 }
  97
  98 static int speex_packet(AVFormatContext *s, int idx)
  99 {
 100     struct ogg *ogg = s->priv_data;
 101     struct ogg_stream *os = ogg->streams + idx;
 102     struct speex_params *spxp = os->private;
 103     int packet_size = spxp->packet_size;
 104
 105     if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
 106         os->granule > 0) {
 107         /* first packet of final page. we have to calculate the final packet
 108            duration here because it is the only place we know the next-to-last
 109            granule position. */
 110         spxp->final_packet_duration = os->granule - os->lastpts -
 111                                       packet_size * (ogg_page_packets(os) - 1);
 112     }
 113
 114     if (!os->lastpts && os->granule > 0)
 115         /* first packet */
 116         os->lastpts = os->lastdts = os->granule - packet_size *
 117                                     ogg_page_packets(os);
 118     if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
 119         spxp->final_packet_duration)
 120         /* final packet */
 121         os->pduration = spxp->final_packet_duration;
 122     else
 123         os->pduration = packet_size;
 124
 125     return 0;
 126 }
 127
 128 const struct ogg_codec ff_speex_codec = {
 129     .magic = "Speex   ",
 130     .magicsize = 8,
 131     .header = speex_header,
 132     .packet = speex_packet,
 133     .nb_header = 2,
 134 };