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