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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 
27 #include "libavutil/bswap.h"
28 #include "libavutil/avstring.h"
30 
31 #include "libavcodec/bytestream.h"
32 
33 #include "avformat.h"
34 #include "internal.h"
35 #include "oggdec.h"
36 
37 struct speex_params {
40  int seq;
41 };
42 
43 static int speex_header(AVFormatContext *s, int idx) {
44  struct ogg *ogg = s->priv_data;
45  struct ogg_stream *os = ogg->streams + idx;
46  struct speex_params *spxp = os->private;
47  AVStream *st = s->streams[idx];
48  uint8_t *p = os->buf + os->pstart;
49 
50  if (!spxp) {
51  spxp = av_mallocz(sizeof(*spxp));
52  if (!spxp)
53  return AVERROR(ENOMEM);
54  os->private = spxp;
55  }
56 
57  if (spxp->seq > 1)
58  return 0;
59 
60  if (spxp->seq == 0) {
61  int frames_per_packet;
64 
65  if (os->psize < 68) {
66  av_log(s, AV_LOG_ERROR, "speex packet too small\n");
67  return AVERROR_INVALIDDATA;
68  }
69 
70  st->codecpar->sample_rate = AV_RL32(p + 36);
71  st->codecpar->channels = AV_RL32(p + 48);
72  if (st->codecpar->channels < 1 || st->codecpar->channels > 2) {
73  av_log(s, AV_LOG_ERROR, "invalid channel count. Speex must be mono or stereo.\n");
74  return AVERROR_INVALIDDATA;
75  }
78 
79  spxp->packet_size = AV_RL32(p + 56);
80  frames_per_packet = AV_RL32(p + 64);
81  if (frames_per_packet)
82  spxp->packet_size *= frames_per_packet;
83 
84  if (ff_alloc_extradata(st->codecpar, os->psize) < 0)
85  return AVERROR(ENOMEM);
86  memcpy(st->codecpar->extradata, p, st->codecpar->extradata_size);
87 
88  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
89  } else
90  ff_vorbis_stream_comment(s, st, p, os->psize);
91 
92  spxp->seq++;
93  return 1;
94 }
95 
96 static int ogg_page_packets(struct ogg_stream *os)
97 {
98  int i;
99  int packets = 0;
100  for (i = 0; i < os->nsegs; i++)
101  if (os->segments[i] < 255)
102  packets++;
103  return packets;
104 }
105 
106 static int speex_packet(AVFormatContext *s, int idx)
107 {
108  struct ogg *ogg = s->priv_data;
109  struct ogg_stream *os = ogg->streams + idx;
110  struct speex_params *spxp = os->private;
111  int packet_size = spxp->packet_size;
112 
113  if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
114  os->granule > 0) {
115  /* first packet of final page. we have to calculate the final packet
116  duration here because it is the only place we know the next-to-last
117  granule position. */
118  spxp->final_packet_duration = os->granule - os->lastpts -
119  packet_size * (ogg_page_packets(os) - 1);
120  }
121 
122  if (!os->lastpts && os->granule > 0)
123  /* first packet */
124  os->lastpts = os->lastdts = os->granule - packet_size *
125  ogg_page_packets(os);
126  if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
127  spxp->final_packet_duration)
128  /* final packet */
129  os->pduration = spxp->final_packet_duration;
130  else
131  os->pduration = packet_size;
132 
133  return 0;
134 }
135 
136 const struct ogg_codec ff_speex_codec = {
137  .magic = "Speex ",
138  .magicsize = 8,
139  .header = speex_header,
140  .packet = speex_packet,
141  .nb_header = 2,
142 };
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:31
static int ogg_page_packets(struct ogg_stream *os)
Definition: oggparsespeex.c:96
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 time base and wrapping info for a given stream.
Definition: utils.c:4507
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
int flags
Definition: oggdec.h:76
#define AV_CH_LAYOUT_STEREO
int64_t lastpts
Definition: oggdec.h:72
Format I/O context.
Definition: avformat.h:1327
unsigned int psize
Definition: oggdec.h:66
uint8_t
int final_packet_duration
Definition: oggparsespeex.c:39
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1395
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4055
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st, const uint8_t *buf, int size)
#define OGG_FLAG_EOS
Definition: oggdec.h:112
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
uint8_t segments[255]
Definition: oggdec.h:80
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3971
audio channel layout utility functions
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3125
uint64_t granule
Definition: oggdec.h:70
unsigned int pstart
Definition: oggdec.h:65
struct ogg_stream * streams
Definition: oggdec.h:102
int segp
Definition: oggdec.h:79
Stream structure.
Definition: avformat.h:878
unsigned int pduration
Definition: oggdec.h:68
int nsegs
Definition: oggdec.h:79
static int speex_packet(AVFormatContext *s, int idx)
static int speex_header(AVFormatContext *s, int idx)
Definition: oggparsespeex.c:43
void * private
Definition: oggdec.h:90
byte swapping routines
int64_t lastdts
Definition: oggdec.h:73
const int8_t * magic
Definition: oggdec.h:32
int sample_rate
Audio only.
Definition: avcodec.h:4063
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
Definition: oggdec.h:101
void * priv_data
Format private data.
Definition: avformat.h:1355
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3967
int channels
Audio only.
Definition: avcodec.h:4059
AVCodecParameters * codecpar
Definition: avformat.h:1230
#define AV_CH_LAYOUT_MONO
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242