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/parseutils.h"
30 #include "avformat.h"
31 #include "internal.h"
32 
33 typedef struct VivoContext {
34  int version;
35 
36  int type;
37  int sequence;
38  int length;
39  int duration;
40 
41  uint8_t text[1024 + 1];
42 } VivoContext;
43 
44 static int vivo_probe(const AVProbeData *p)
45 {
46  const unsigned char *buf = p->buf;
47  unsigned c, length = 0;
48 
49  // stream must start with packet of type 0 and sequence number 0
50  if (*buf++ != 0)
51  return 0;
52 
53  // read at most 2 bytes of coded length
54  c = *buf++;
55  length = c & 0x7F;
56  if (c & 0x80) {
57  c = *buf++;
58  length = (length << 7) | (c & 0x7F);
59  }
60  if (c & 0x80 || length > 1024 || length < 21)
61  return 0;
62 
63  buf += 2;
64  if (memcmp(buf, "Version:Vivo/", 13))
65  return 0;
66  buf += 13;
67 
68  if (*buf < '0' || *buf > '2')
69  return 0;
70 
71  return AVPROBE_SCORE_MAX;
72 }
73 
75 {
76  VivoContext *vivo = s->priv_data;
77  AVIOContext *pb = s->pb;
78  unsigned c, get_length = 0;
79 
80  if (avio_feof(pb))
81  return AVERROR_EOF;
82 
83  c = avio_r8(pb);
84  if (c == 0x82) {
85  get_length = 1;
86  c = avio_r8(pb);
87  }
88 
89  vivo->type = c >> 4;
90  vivo->sequence = c & 0xF;
91 
92  switch (vivo->type) {
93  case 0: get_length = 1; break;
94  case 1: vivo->length = 128; break;
95  case 2: get_length = 1; break;
96  case 3: vivo->length = 40; break;
97  case 4: vivo->length = 24; break;
98  default:
99  av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
100  return AVERROR_INVALIDDATA;
101  }
102 
103  if (get_length) {
104  c = avio_r8(pb);
105  vivo->length = c & 0x7F;
106  if (c & 0x80) {
107  c = avio_r8(pb);
108  vivo->length = (vivo->length << 7) | (c & 0x7F);
109 
110  if (c & 0x80) {
111  av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
112  return AVERROR_INVALIDDATA;
113  }
114  }
115  }
116 
117  return 0;
118 }
119 
121 {
122  VivoContext *vivo = s->priv_data;
123  AVRational fps = { 1, 25};
124  AVStream *ast, *vst;
125  unsigned char *line, *line_end, *key, *value;
126  long value_int;
127  int ret, value_used;
128  int64_t duration = 0;
129  char *end_value;
130 
131  vst = avformat_new_stream(s, NULL);
132  ast = avformat_new_stream(s, NULL);
133  if (!ast || !vst)
134  return AVERROR(ENOMEM);
135 
136  ast->codecpar->sample_rate = 8000;
137 
138  while (1) {
139  if ((ret = vivo_get_packet_header(s)) < 0)
140  return ret;
141 
142  // done reading all text header packets?
143  if (vivo->sequence || vivo->type)
144  break;
145 
146  if (vivo->length <= 1024) {
147  avio_read(s->pb, vivo->text, vivo->length);
148  vivo->text[vivo->length] = 0;
149  } else {
150  av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
151  avio_skip(s->pb, vivo->length);
152  continue;
153  }
154 
155  line = vivo->text;
156  while (*line) {
157  line_end = strstr(line, "\r\n");
158  if (!line_end)
159  break;
160 
161  *line_end = 0;
162  key = line;
163  line = line_end + 2; // skip \r\n
164 
165  if (line_end == key) // skip blank lines
166  continue;
167 
168  value = strchr(key, ':');
169  if (!value) {
170  av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
171  key);
172  continue;
173  }
174 
175  *value++ = 0;
176 
177  av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
178 
179  value_int = strtol(value, &end_value, 10);
180  value_used = 0;
181  if (*end_value == 0) { // valid integer
182  av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
183  value_used = 1;
184  if (!strcmp(key, "Duration")) {
185  duration = value_int;
186  } else if (!strcmp(key, "Width")) {
187  vst->codecpar->width = value_int;
188  } else if (!strcmp(key, "Height")) {
189  vst->codecpar->height = value_int;
190  } else if (!strcmp(key, "TimeUnitNumerator")) {
191  fps.num = value_int / 1000;
192  } else if (!strcmp(key, "TimeUnitDenominator")) {
193  fps.den = value_int;
194  } else if (!strcmp(key, "SamplingFrequency")) {
195  ast->codecpar->sample_rate = value_int;
196  } else if (!strcmp(key, "NominalBitrate")) {
197  } else if (!strcmp(key, "Length")) {
198  // size of file
199  } else {
200  value_used = 0;
201  }
202  }
203 
204  if (!strcmp(key, "Version")) {
205  if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
206  return AVERROR_INVALIDDATA;
207  value_used = 1;
208  } else if (!strcmp(key, "FPS")) {
209  AVRational tmp;
210 
211  value_used = 1;
212  if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s))
213  fps = av_inv_q(tmp);
214  }
215 
216  if (!value_used)
217  av_dict_set(&s->metadata, key, value, 0);
218  }
219  }
220 
221  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
222  avpriv_set_pts_info(vst, 64, fps.num, fps.den);
223  if (duration)
224  s->duration = av_rescale(duration, 1000, 1);
225 
226  vst->start_time = 0;
227  vst->codecpar->codec_tag = 0;
229 
230  if (vivo->version == 1) {
234  ast->codecpar->block_align = 24;
235  ast->codecpar->bit_rate = 6400;
236  } else {
238  ast->codecpar->bits_per_coded_sample = 16;
239  ast->codecpar->block_align = 40;
240  ast->codecpar->bit_rate = 6400;
241  vivo->duration = 320;
242  }
243 
244  ast->start_time = 0;
245  ast->codecpar->codec_tag = 0;
247  ast->codecpar->channels = 1;
248 
249  return 0;
250 }
251 
253 {
254  VivoContext *vivo = s->priv_data;
255  AVIOContext *pb = s->pb;
256  unsigned old_sequence = vivo->sequence, old_type = vivo->type;
257  int stream_index, duration, ret = 0;
258 
259 restart:
260 
261  if (avio_feof(pb))
262  return AVERROR_EOF;
263 
264  switch (vivo->type) {
265  case 0:
266  avio_skip(pb, vivo->length);
267  if ((ret = vivo_get_packet_header(s)) < 0)
268  return ret;
269  goto restart;
270  case 1:
271  case 2: // video
272  stream_index = 0;
273  duration = 1;
274  break;
275  case 3:
276  case 4: // audio
277  stream_index = 1;
278  duration = vivo->duration;
279  break;
280  default:
281  av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
282  return AVERROR_INVALIDDATA;
283  }
284 
285  if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
286  return ret;
287 
288  // get next packet header
289  if ((ret = vivo_get_packet_header(s)) < 0)
290  return ret;
291 
292  while (vivo->sequence == old_sequence &&
293  (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
294  if (avio_feof(pb)) {
295  return AVERROR_EOF;
296  }
297 
298  if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
299  return ret;
300 
301  // get next packet header
302  if ((ret = vivo_get_packet_header(s)) < 0)
303  return ret;
304  }
305 
306  pkt->stream_index = stream_index;
307  pkt->duration = duration;
308 
309  return ret;
310 }
311 
313  .name = "vivo",
314  .long_name = NULL_IF_CONFIG_SMALL("Vivo"),
315  .priv_data_size = sizeof(VivoContext),
319  .extensions = "viv",
320 };
int av_parse_ratio(AVRational *q, const char *str, int max, int log_offset, void *log_ctx)
Parse str and store the parsed ratio in q.
Definition: parseutils.c:45
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int sequence
Definition: vivo.c:37
#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:4943
int length
Definition: vivo.c:38
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4036
int num
Numerator.
Definition: rational.h:59
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
const char * key
static AVPacket pkt
static int vivo_read_header(AVFormatContext *s)
Definition: vivo.c:120
Format I/O context.
Definition: avformat.h:1353
uint8_t
int width
Video only.
Definition: avcodec.h:4102
int duration
Definition: vivo.c:39
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1551
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
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4524
AVInputFormat ff_vivo_demuxer
Definition: vivo.c:312
#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:308
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:645
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:318
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:4065
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1593
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4032
GLsizei GLsizei * length
Definition: opengl_enc.c:114
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:636
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
static int vivo_get_packet_header(AVFormatContext *s)
Definition: vivo.c:74
int block_align
Audio only.
Definition: avcodec.h:4153
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
uint8_t text[1024+1]
Definition: vivo.c:41
static int vivo_probe(const AVProbeData *p)
Definition: vivo.c:44
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vivo.c:252
AVIOContext * pb
I/O context.
Definition: avformat.h:1395
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:70
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int version
Definition: vivo.c:34
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
misc parsing utilities
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int sample_rate
Audio only.
Definition: avcodec.h:4146
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
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:33
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:915
int den
Denominator.
Definition: rational.h:60
int type
Definition: vivo.c:36
void * priv_data
Format private data.
Definition: avformat.h:1381
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4078
int channels
Audio only.
Definition: avcodec.h:4142
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1468
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4040
int stream_index
Definition: avcodec.h:1535
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
This structure stores compressed data.
Definition: avcodec.h:1510
static uint8_t tmp[11]
Definition: aes_ctr.c:26