FFmpeg  4.3
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:4938
int length
Definition: vivo.c:38
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
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:1351
uint8_t
int width
Video only.
Definition: codec_par.h:126
int duration
Definition: vivo.c:39
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4519
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:304
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
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:314
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
#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:1591
#define AVERROR(e)
Definition: error.h:43
#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: codec_par.h:56
Definition: graph2dot.c:48
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
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: codec_par.h:177
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:1393
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
double value
Definition: eval.c:98
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: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:915
static double c[64]
int den
Denominator.
Definition: rational.h:60
int type
Definition: vivo.c:36
void * priv_data
Format private data.
Definition: avformat.h:1379
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 duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1466
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: codec_par.h:64
int stream_index
Definition: packet.h:357
This structure stores compressed data.
Definition: packet.h:332
static uint8_t tmp[11]
Definition: aes_ctr.c:26