FFmpeg
vivo.c
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1 /*
2  * Vivo stream demuxer
3  * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * @brief Vivo stream demuxer
25  * @author Daniel Verkamp <daniel at drv.nu>
26  * @sa http://wiki.multimedia.cx/index.php?title=Vivo
27  */
28 
29 #include "libavutil/avstring.h"
30 #include "libavutil/parseutils.h"
31 #include "avformat.h"
32 #include "internal.h"
33 
34 typedef struct VivoContext {
35  int version;
36 
37  int type;
38  int sequence;
39  int length;
40  int duration;
41 
42  uint8_t text[1024 + 1];
43 } VivoContext;
44 
45 static int vivo_probe(const AVProbeData *p)
46 {
47  const unsigned char *buf = p->buf;
48  unsigned c, length = 0;
49 
50  // stream must start with packet of type 0 and sequence number 0
51  if (*buf++ != 0)
52  return 0;
53 
54  // read at most 2 bytes of coded length
55  c = *buf++;
56  length = c & 0x7F;
57  if (c & 0x80) {
58  c = *buf++;
59  length = (length << 7) | (c & 0x7F);
60  }
61  if (c & 0x80 || length > 1024 || length < 21)
62  return 0;
63 
64  buf += 2;
65  if (memcmp(buf, "Version:Vivo/", 13))
66  return 0;
67  buf += 13;
68 
69  if (*buf < '0' || *buf > '2')
70  return 0;
71 
72  return AVPROBE_SCORE_MAX;
73 }
74 
76 {
77  VivoContext *vivo = s->priv_data;
78  AVIOContext *pb = s->pb;
79  unsigned c, get_length = 0;
80 
81  if (avio_feof(pb))
82  return AVERROR_EOF;
83 
84  c = avio_r8(pb);
85  if (c == 0x82) {
86  get_length = 1;
87  c = avio_r8(pb);
88  }
89 
90  vivo->type = c >> 4;
91  vivo->sequence = c & 0xF;
92 
93  switch (vivo->type) {
94  case 0: get_length = 1; break;
95  case 1: vivo->length = 128; break;
96  case 2: get_length = 1; break;
97  case 3: vivo->length = 40; break;
98  case 4: vivo->length = 24; break;
99  default:
100  av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
101  return AVERROR_INVALIDDATA;
102  }
103 
104  if (get_length) {
105  c = avio_r8(pb);
106  vivo->length = c & 0x7F;
107  if (c & 0x80) {
108  c = avio_r8(pb);
109  vivo->length = (vivo->length << 7) | (c & 0x7F);
110 
111  if (c & 0x80) {
112  av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
113  return AVERROR_INVALIDDATA;
114  }
115  }
116  }
117 
118  return 0;
119 }
120 
122 {
123  VivoContext *vivo = s->priv_data;
124  AVRational fps = { 0 };
125  AVStream *ast, *vst;
126  unsigned char *line, *line_end, *key, *value;
127  long value_int;
128  int ret, value_used;
129  int64_t duration = 0;
130  char *end_value;
131 
132  vst = avformat_new_stream(s, NULL);
133  ast = avformat_new_stream(s, NULL);
134  if (!ast || !vst)
135  return AVERROR(ENOMEM);
136 
137  ast->codecpar->sample_rate = 8000;
138 
139  while (1) {
140  if ((ret = vivo_get_packet_header(s)) < 0)
141  return ret;
142 
143  // done reading all text header packets?
144  if (vivo->sequence || vivo->type)
145  break;
146 
147  if (vivo->length <= 1024) {
148  avio_read(s->pb, vivo->text, vivo->length);
149  vivo->text[vivo->length] = 0;
150  } else {
151  av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
152  avio_skip(s->pb, vivo->length);
153  continue;
154  }
155 
156  line = vivo->text;
157  while (*line) {
158  line_end = strstr(line, "\r\n");
159  if (!line_end)
160  break;
161 
162  *line_end = 0;
163  key = line;
164  line = line_end + 2; // skip \r\n
165 
166  if (line_end == key) // skip blank lines
167  continue;
168 
169  value = strchr(key, ':');
170  if (!value) {
171  av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
172  key);
173  continue;
174  }
175 
176  *value++ = 0;
177 
178  av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
179 
180  value_int = strtol(value, &end_value, 10);
181  value_used = 0;
182  if (*end_value == 0) { // valid integer
183  av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
184  value_used = 1;
185  if (!strcmp(key, "Duration")) {
186  duration = value_int;
187  } else if (!strcmp(key, "Width")) {
188  vst->codecpar->width = value_int;
189  } else if (!strcmp(key, "Height")) {
190  vst->codecpar->height = value_int;
191  } else if (!strcmp(key, "TimeUnitNumerator")) {
192  fps.num = value_int / 1000;
193  } else if (!strcmp(key, "TimeUnitDenominator")) {
194  fps.den = value_int;
195  } else if (!strcmp(key, "SamplingFrequency")) {
196  ast->codecpar->sample_rate = value_int;
197  } else if (!strcmp(key, "NominalBitrate")) {
198  } else if (!strcmp(key, "Length")) {
199  // size of file
200  } else {
201  value_used = 0;
202  }
203  }
204 
205  if (!strcmp(key, "Version")) {
206  if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
207  return AVERROR_INVALIDDATA;
208  value_used = 1;
209  } else if (!strcmp(key, "FPS")) {
210  double d;
211  if (av_sscanf(value, "%f", &d) != 1)
212  return AVERROR_INVALIDDATA;
213 
214  value_used = 1;
215  if (!fps.num && !fps.den)
216  fps = av_inv_q(av_d2q(d, 10000));
217  }
218 
219  if (!value_used)
220  av_dict_set(&s->metadata, key, value, 0);
221  }
222  }
223  if (!fps.num || !fps.den)
224  fps = (AVRational){ 1, 25 };
225 
226  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
227  avpriv_set_pts_info(vst, 64, fps.num, fps.den);
228  if (duration)
229  s->duration = av_rescale(duration, 1000, 1);
230 
231  vst->start_time = 0;
232  vst->codecpar->codec_tag = 0;
234 
235  if (vivo->version == 1) {
239  ast->codecpar->block_align = 24;
240  ast->codecpar->bit_rate = 6400;
241  } else {
243  ast->codecpar->bits_per_coded_sample = 16;
244  ast->codecpar->block_align = 40;
245  ast->codecpar->bit_rate = 6400;
246  vivo->duration = 320;
247  }
248 
249  ast->start_time = 0;
250  ast->codecpar->codec_tag = 0;
252  ast->codecpar->ch_layout.nb_channels = 1;
253 
254  return 0;
255 }
256 
258 {
259  VivoContext *vivo = s->priv_data;
260  AVIOContext *pb = s->pb;
261  unsigned old_sequence = vivo->sequence, old_type = vivo->type;
262  int stream_index, duration, ret = 0;
263 
264 restart:
265 
266  if (avio_feof(pb))
267  return AVERROR_EOF;
268 
269  switch (vivo->type) {
270  case 0:
271  avio_skip(pb, vivo->length);
272  if ((ret = vivo_get_packet_header(s)) < 0)
273  return ret;
274  goto restart;
275  case 1:
276  case 2: // video
277  stream_index = 0;
278  duration = 1;
279  break;
280  case 3:
281  case 4: // audio
282  stream_index = 1;
283  duration = vivo->duration;
284  break;
285  default:
286  av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
287  return AVERROR_INVALIDDATA;
288  }
289 
290  if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
291  return ret;
292 
293  // get next packet header
294  if ((ret = vivo_get_packet_header(s)) < 0)
295  return ret;
296 
297  while (vivo->sequence == old_sequence &&
298  (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
299  if (avio_feof(pb)) {
300  return AVERROR_EOF;
301  }
302 
303  if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
304  return ret;
305 
306  // get next packet header
307  if ((ret = vivo_get_packet_header(s)) < 0)
308  return ret;
309  }
310 
311  pkt->stream_index = stream_index;
312  pkt->duration = duration;
313 
314  return ret;
315 }
316 
318  .name = "vivo",
319  .long_name = NULL_IF_CONFIG_SMALL("Vivo"),
320  .priv_data_size = sizeof(VivoContext),
324  .extensions = "viv",
325 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
VivoContext
Definition: vivo.c:34
AV_CODEC_ID_SIREN
@ AV_CODEC_ID_SIREN
Definition: codec_id.h:527
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:237
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:58
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:392
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:66
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
VivoContext::duration
int duration
Definition: vivo.c:40
VivoContext::version
int version
Definition: vivo.c:35
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
vivo_get_packet_header
static int vivo_get_packet_header(AVFormatContext *s)
Definition: vivo.c:75
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:763
VivoContext::type
int type
Definition: vivo.c:37
AVRational::num
int num
Numerator.
Definition: rational.h:59
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:656
duration
int64_t duration
Definition: movenc.c:64
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:128
vivo_probe
static int vivo_probe(const AVProbeData *p)
Definition: vivo.c:45
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
vivo_read_packet
static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vivo.c:257
key
const char * key
Definition: hwcontext_opencl.c:174
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
vivo_read_header
static int vivo_read_header(AVFormatContext *s)
Definition: vivo.c:121
av_sscanf
int av_sscanf(const char *string, const char *format,...)
See libc sscanf manual for more information.
Definition: avsscanf.c:962
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:540
VivoContext::length
int length
Definition: vivo.c:39
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_CODEC_ID_G723_1
@ AV_CODEC_ID_G723_1
Definition: codec_id.h:487
parseutils.h
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:213
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:178
VivoContext::text
uint8_t text[1024+1]
Definition: vivo.c:42
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:115
AV_CODEC_ID_H263
@ AV_CODEC_ID_H263
Definition: codec_id.h:56
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:634
line
Definition: graph2dot.c:48
AVCodecParameters::height
int height
Definition: codec_par.h:129
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:185
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
av_rescale
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
av_get_packet
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:102
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:948
av_append_packet
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
Read data and append it to the current content of the AVPacket.
Definition: utils.c:118
avformat.h
AVRational::den
int den
Denominator.
Definition: rational.h:60
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:643
AVPacket::stream_index
int stream_index
Definition: packet.h:376
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:349
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:104
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:62
AVPacket
This structure stores compressed data.
Definition: packet.h:351
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:86
ff_vivo_demuxer
const AVInputFormat ff_vivo_demuxer
Definition: vivo.c:317
d
d
Definition: ffmpeg_filter.c:156
VivoContext::sequence
int sequence
Definition: vivo.c:38
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:91
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:988
avstring.h
line
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
Definition: swscale.txt:40
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:377