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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"
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 {
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;
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  }
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  st->codec->extradata_size = os->psize;
83  memcpy(st->codec->extradata, p, st->codec->extradata_size);
84 
85  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
86  } else
87  ff_vorbis_comment(s, &st->metadata, p, os->psize);
88 
89  spxp->seq++;
90  return 1;
91 }
92 
93 static int ogg_page_packets(struct ogg_stream *os)
94 {
95  int i;
96  int packets = 0;
97  for (i = 0; i < os->nsegs; i++)
98  if (os->segments[i] < 255)
99  packets++;
100  return packets;
101 }
102 
103 static int speex_packet(AVFormatContext *s, int idx)
104 {
105  struct ogg *ogg = s->priv_data;
106  struct ogg_stream *os = ogg->streams + idx;
107  struct speex_params *spxp = os->private;
108  int packet_size = spxp->packet_size;
109 
110  if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
111  os->granule > 0) {
112  /* first packet of final page. we have to calculate the final packet
113  duration here because it is the only place we know the next-to-last
114  granule position. */
115  spxp->final_packet_duration = os->granule - os->lastpts -
116  packet_size * (ogg_page_packets(os) - 1);
117  }
118 
119  if (!os->lastpts && os->granule > 0)
120  /* first packet */
121  os->lastpts = os->lastdts = os->granule - packet_size *
122  ogg_page_packets(os);
123  if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
124  spxp->final_packet_duration)
125  /* final packet */
126  os->pduration = spxp->final_packet_duration;
127  else
128  os->pduration = packet_size;
129 
130  return 0;
131 }
132 
133 const struct ogg_codec ff_speex_codec = {
134  .magic = "Speex ",
135  .magicsize = 8,
136  .header = speex_header,
137  .packet = speex_packet,
138  .nb_header = 2,
139 };