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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  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_stream_comment(s, st, 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 };