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 
40  uint8_t text[1024 + 1];
41 } VivoContext;
42 
43 static int vivo_probe(const AVProbeData *p)
44 {
45  const unsigned char *buf = p->buf;
46  unsigned c, length = 0;
47 
48  // stream must start with packet of type 0 and sequence number 0
49  if (*buf++ != 0)
50  return 0;
51 
52  // read at most 2 bytes of coded length
53  c = *buf++;
54  length = c & 0x7F;
55  if (c & 0x80) {
56  c = *buf++;
57  length = (length << 7) | (c & 0x7F);
58  }
59  if (c & 0x80 || length > 1024 || length < 21)
60  return 0;
61 
62  if (memcmp(buf, "\r\nVersion:Vivo/", 15))
63  return 0;
64  buf += 15;
65 
66  if (*buf < '0' || *buf > '2')
67  return 0;
68 
69  return AVPROBE_SCORE_MAX;
70 }
71 
73 {
74  VivoContext *vivo = s->priv_data;
75  AVIOContext *pb = s->pb;
76  unsigned c, get_length = 0;
77 
78  if (avio_feof(pb))
79  return AVERROR_EOF;
80 
81  c = avio_r8(pb);
82  if (c == 0x82) {
83  get_length = 1;
84  c = avio_r8(pb);
85  }
86 
87  vivo->type = c >> 4;
88  vivo->sequence = c & 0xF;
89 
90  switch (vivo->type) {
91  case 0: get_length = 1; break;
92  case 1: vivo->length = 128; break;
93  case 2: get_length = 1; break;
94  case 3: vivo->length = 40; break;
95  case 4: vivo->length = 24; break;
96  default:
97  av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
98  return AVERROR_INVALIDDATA;
99  }
100 
101  if (get_length) {
102  c = avio_r8(pb);
103  vivo->length = c & 0x7F;
104  if (c & 0x80) {
105  c = avio_r8(pb);
106  vivo->length = (vivo->length << 7) | (c & 0x7F);
107 
108  if (c & 0x80) {
109  av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
110  return AVERROR_INVALIDDATA;
111  }
112  }
113  }
114 
115  return 0;
116 }
117 
119 {
120  VivoContext *vivo = s->priv_data;
121  AVRational fps = { 1, 25};
122  AVStream *ast, *vst;
123  unsigned char *line, *line_end, *key, *value;
124  long value_int;
125  int ret, value_used;
126  int64_t duration = 0;
127  char *end_value;
128 
129  vst = avformat_new_stream(s, NULL);
130  ast = avformat_new_stream(s, NULL);
131  if (!ast || !vst)
132  return AVERROR(ENOMEM);
133 
134  ast->codecpar->sample_rate = 8000;
135 
136  while (1) {
137  if ((ret = vivo_get_packet_header(s)) < 0)
138  return ret;
139 
140  // done reading all text header packets?
141  if (vivo->sequence || vivo->type)
142  break;
143 
144  if (vivo->length <= 1024) {
145  avio_read(s->pb, vivo->text, vivo->length);
146  vivo->text[vivo->length] = 0;
147  } else {
148  av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
149  avio_skip(s->pb, vivo->length);
150  continue;
151  }
152 
153  line = vivo->text;
154  while (*line) {
155  line_end = strstr(line, "\r\n");
156  if (!line_end)
157  break;
158 
159  *line_end = 0;
160  key = line;
161  line = line_end + 2; // skip \r\n
162 
163  if (line_end == key) // skip blank lines
164  continue;
165 
166  value = strchr(key, ':');
167  if (!value) {
168  av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
169  key);
170  continue;
171  }
172 
173  *value++ = 0;
174 
175  av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
176 
177  value_int = strtol(value, &end_value, 10);
178  value_used = 0;
179  if (*end_value == 0) { // valid integer
180  av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
181  value_used = 1;
182  if (!strcmp(key, "Duration")) {
183  duration = value_int;
184  } else if (!strcmp(key, "Width")) {
185  vst->codecpar->width = value_int;
186  } else if (!strcmp(key, "Height")) {
187  vst->codecpar->height = value_int;
188  } else if (!strcmp(key, "TimeUnitNumerator")) {
189  fps.num = value_int / 1000;
190  } else if (!strcmp(key, "TimeUnitDenominator")) {
191  fps.den = value_int;
192  } else if (!strcmp(key, "SamplingFrequency")) {
193  ast->codecpar->sample_rate = value_int;
194  } else if (!strcmp(key, "NominalBitrate")) {
195  } else if (!strcmp(key, "Length")) {
196  // size of file
197  } else {
198  value_used = 0;
199  }
200  }
201 
202  if (!strcmp(key, "Version")) {
203  if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
204  return AVERROR_INVALIDDATA;
205  value_used = 1;
206  } else if (!strcmp(key, "FPS")) {
207  AVRational tmp;
208 
209  value_used = 1;
210  if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s))
211  fps = av_inv_q(tmp);
212  }
213 
214  if (!value_used)
215  av_dict_set(&s->metadata, key, value, 0);
216  }
217  }
218 
219  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
220  avpriv_set_pts_info(vst, 64, fps.num, fps.den);
221  if (duration)
222  s->duration = av_rescale(duration, 1000, 1);
223 
224  vst->start_time = 0;
225  vst->codecpar->codec_tag = 0;
227 
228  if (vivo->version == 1) {
232  ast->codecpar->block_align = 24;
233  ast->codecpar->bit_rate = 6400;
234  }
235 
236  ast->start_time = 0;
237  ast->codecpar->codec_tag = 0;
239  ast->codecpar->channels = 1;
240 
241  return 0;
242 }
243 
245 {
246  VivoContext *vivo = s->priv_data;
247  AVIOContext *pb = s->pb;
248  unsigned old_sequence = vivo->sequence, old_type = vivo->type;
249  int stream_index, ret = 0;
250 
251 restart:
252 
253  if (avio_feof(pb))
254  return AVERROR_EOF;
255 
256  switch (vivo->type) {
257  case 0:
258  avio_skip(pb, vivo->length);
259  if ((ret = vivo_get_packet_header(s)) < 0)
260  return ret;
261  goto restart;
262  case 1:
263  case 2: // video
264  stream_index = 0;
265  break;
266  case 3:
267  case 4: // audio
268  stream_index = 1;
269  break;
270  default:
271  av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
272  return AVERROR_INVALIDDATA;
273  }
274 
275  if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
276  goto fail;
277 
278  // get next packet header
279  if ((ret = vivo_get_packet_header(s)) < 0)
280  goto fail;
281 
282  while (vivo->sequence == old_sequence &&
283  (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
284  if (avio_feof(pb)) {
285  ret = AVERROR_EOF;
286  break;
287  }
288 
289  if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
290  break;
291 
292  // get next packet header
293  if ((ret = vivo_get_packet_header(s)) < 0)
294  break;
295  }
296 
297  pkt->stream_index = stream_index;
298 
299 fail:
300  if (ret < 0)
301  av_packet_unref(pkt);
302  return ret;
303 }
304 
306  .name = "vivo",
307  .long_name = NULL_IF_CONFIG_SMALL("Vivo"),
308  .priv_data_size = sizeof(VivoContext),
312  .extensions = "viv",
313 };
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:4929
int length
Definition: vivo.c:38
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
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:334
const char * key
static AVPacket pkt
static int vivo_read_header(AVFormatContext *s)
Definition: vivo.c:118
Format I/O context.
Definition: avformat.h:1358
uint8_t
int width
Video only.
Definition: avcodec.h:4034
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:4502
int64_t duration
Definition: movenc.c:63
AVInputFormat ff_vivo_demuxer
Definition: vivo.c:305
#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:310
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
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:320
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3997
#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:1598
#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:3964
GLsizei GLsizei * length
Definition: opengl_enc.c:114
#define fail()
Definition: checkasm.h:122
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:641
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
static int vivo_get_packet_header(AVFormatContext *s)
Definition: vivo.c:72
int block_align
Audio only.
Definition: avcodec.h:4085
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:40
static int vivo_probe(const AVProbeData *p)
Definition: vivo.c:43
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
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:244
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
void * buf
Definition: avisynth_c.h:766
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:446
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:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
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:920
int den
Denominator.
Definition: rational.h:60
int type
Definition: vivo.c:36
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1473
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
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:1457
static uint8_t tmp[11]
Definition: aes_ctr.c:26