FFmpeg  4.3.9
voc_packet.c
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1 /*
2  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/intreadwrite.h"
22 #include "avformat.h"
23 #include "internal.h"
24 #include "voc.h"
25 
26 int
28 {
29  VocDecContext *voc = s->priv_data;
30  AVCodecParameters *par = st->codecpar;
31  AVIOContext *pb = s->pb;
32  VocType type;
33  int size, tmp_codec=-1;
34  int sample_rate = 0;
35  int channels = 1;
37  int ret;
38 
40  avio_tell(pb),
41  voc->pts,
42  voc->remaining_size,
43  0,
45 
46  while (!voc->remaining_size) {
47  if (max_size < 4)
48  max_size = 0;
49  type = avio_r8(pb);
50  if (type == VOC_TYPE_EOF)
51  return AVERROR_EOF;
52  voc->remaining_size = avio_rl24(pb);
53  if (!voc->remaining_size) {
54  int64_t filesize;
55  if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
56  return AVERROR(EIO);
57  filesize = avio_size(pb);
58  if (filesize - avio_tell(pb) > INT_MAX)
59  return AVERROR_INVALIDDATA;
60  voc->remaining_size = filesize - avio_tell(pb);
61  }
62  max_size -= 4;
63 
64  switch (type) {
66  if (voc->remaining_size < 2) {
67  voc->remaining_size = 0;
68  return AVERROR_INVALIDDATA;
69  }
70  if (!par->sample_rate) {
71  par->sample_rate = 1000000 / (256 - avio_r8(pb));
72  if (sample_rate)
73  par->sample_rate = sample_rate;
74  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
75  par->channels = channels;
77  } else
78  avio_skip(pb, 1);
79  tmp_codec = avio_r8(pb);
80  voc->remaining_size -= 2;
81  max_size -= 2;
82  channels = 1;
83  break;
84 
86  break;
87 
88  case VOC_TYPE_EXTENDED:
89  sample_rate = avio_rl16(pb);
90  avio_r8(pb);
91  channels = avio_r8(pb) + 1;
92  sample_rate = 256000000 / (channels * (65536 - sample_rate));
93  voc->remaining_size = 0;
94  max_size -= 4;
95  break;
96 
98  if (voc->remaining_size < 12) {
99  voc->remaining_size = 0;
100  return AVERROR_INVALIDDATA;
101  }
102  if (!par->sample_rate) {
103  par->sample_rate = avio_rl32(pb);
104  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
105  par->bits_per_coded_sample = avio_r8(pb);
106  par->channels = avio_r8(pb);
107  } else
108  avio_skip(pb, 6);
109  tmp_codec = avio_rl16(pb);
110  avio_skip(pb, 4);
111  voc->remaining_size -= 12;
112  max_size -= 12;
113  break;
114 
115  default:
116  avio_skip(pb, voc->remaining_size);
117  max_size -= voc->remaining_size;
118  voc->remaining_size = 0;
119  break;
120  }
121  }
122 
123  if (par->sample_rate <= 0) {
124  av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", par->sample_rate);
125  return AVERROR_INVALIDDATA;
126  }
127 
128  if (tmp_codec >= 0) {
129  tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
130  if (par->codec_id == AV_CODEC_ID_NONE)
131  par->codec_id = tmp_codec;
132  else if (par->codec_id != tmp_codec)
133  av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
134  if (par->codec_id == AV_CODEC_ID_NONE) {
135  if (s->audio_codec_id == AV_CODEC_ID_NONE) {
136  av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
137  return AVERROR(EINVAL);
138  }
139  av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
140  }
141  }
142 
143  par->bit_rate = (int64_t)par->sample_rate * par->channels * par->bits_per_coded_sample;
144 
145  if (max_size <= 0)
146  max_size = 2048;
147  size = FFMIN(voc->remaining_size, max_size);
148  voc->remaining_size -= size;
149 
150  ret = av_get_packet(pb, pkt, size);
151  pkt->dts = pkt->pts = voc->pts;
152 
153  duration = av_get_audio_frame_duration2(st->codecpar, size);
154  if (duration > 0 && voc->pts != AV_NOPTS_VALUE)
155  voc->pts += duration;
156  else
157  voc->pts = AV_NOPTS_VALUE;
158 
159  return ret;
160 }
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:334
int size
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2052
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3165
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:4948
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1351
int64_t duration
Definition: movenc.c:63
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:307
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
channels
Definition: aptx.h:33
#define av_log(a,...)
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
#define AVINDEX_KEYFRAME
Definition: avformat.h:812
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1583
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
#define AVERROR(e)
Definition: error.h:43
VocType
Definition: voc.h:33
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1818
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
#define FFMIN(a, b)
Definition: common.h:96
enum AVCodecID audio_codec_id
Forced audio codec_id.
Definition: avformat.h:1543
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:876
int ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
Definition: voc_packet.c:27
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
sample_rate
const AVCodecTag ff_voc_codec_tags[]
Definition: voc.c:27
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
int64_t pts
Definition: voc.h:30
long long int64_t
Definition: coverity.c:34
cl_device_type type
int sample_rate
Audio only.
Definition: codec_par.h:170
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:731
Main libavformat public API header.
if(ret< 0)
Definition: vf_mcdeint.c:279
void * priv_data
Format private data.
Definition: avformat.h:1379
int64_t remaining_size
Definition: voc.h:29
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:354
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:739
This structure stores compressed data.
Definition: packet.h:332
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248