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 };
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:154
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:31
static int ogg_page_packets(struct ogg_stream *os)
Definition: oggparsespeex.c:81
const struct ogg_codec ff_speex_codec
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the pts for a given stream.
Definition: utils.c:3828
int flags
Definition: oggdec.h:75
int64_t lastpts
Definition: oggdec.h:71
Format I/O context.
Definition: avformat.h:863
unsigned int psize
Definition: oggdec.h:66
int final_packet_duration
Definition: oggparsespeex.c:36
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1387
AVStream ** streams
Definition: avformat.h:908
bitstream reader API header.
int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m, const uint8_t *buf, int size)
AV_RL32
Definition: bytestream.h:89
#define OGG_FLAG_EOS
Definition: oggdec.h:104
uint8_t segments[255]
Definition: oggdec.h:79
AVCodecContext * codec
codec context
Definition: avformat.h:623
uint64_t granule
Definition: oggdec.h:70
unsigned int pstart
Definition: oggdec.h:65
struct ogg_stream * streams
Definition: oggdec.h:95
int segp
Definition: oggdec.h:78
AVDictionary * metadata
Definition: avformat.h:718
Stream structure.
Definition: avformat.h:620
enum AVMediaType codec_type
Definition: avcodec.h:1574
unsigned int pduration
Definition: oggdec.h:68
int nsegs
Definition: oggdec.h:78
int sample_rate
samples per second
Definition: avcodec.h:1456
static int speex_packet(AVFormatContext *s, int idx)
Definition: oggparsespeex.c:91
static int speex_header(AVFormatContext *s, int idx)
Definition: oggparsespeex.c:40
int extradata_size
Definition: avcodec.h:1388
void * private
Definition: oggdec.h:83
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:64
byte swapping routines
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:497
int64_t lastdts
Definition: oggdec.h:72
const int8_t * magic
Definition: oggdec.h:32
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
Definition: oggdec.h:94
int channels
number of audio channels
Definition: avcodec.h:1457
void * priv_data
Format private data.
Definition: avformat.h:883
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:271
enum CodecID codec_id
Definition: avcodec.h:1575