Libav
ffmdec.c
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1 /*
2  * FFM (avserver live feed) demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdint.h>
23 
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "ffm.h"
29 
31 {
32  FFMContext *ffm = s->priv_data;
33  int64_t pos, avail_size;
34  int len;
35 
36  len = ffm->packet_end - ffm->packet_ptr;
37  if (size <= len)
38  return 1;
39  pos = avio_tell(s->pb);
40  if (!ffm->write_index) {
41  if (pos == ffm->file_size)
42  return AVERROR_EOF;
43  avail_size = ffm->file_size - pos;
44  } else {
45  if (pos == ffm->write_index) {
46  /* exactly at the end of stream */
47  return AVERROR(EAGAIN);
48  } else if (pos < ffm->write_index) {
49  avail_size = ffm->write_index - pos;
50  } else {
51  avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
52  }
53  }
54  avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
55  if (size <= avail_size)
56  return 1;
57  else
58  return AVERROR(EAGAIN);
59 }
60 
61 static int ffm_resync(AVFormatContext *s, int state)
62 {
63  av_log(s, AV_LOG_ERROR, "resyncing\n");
64  while (state != PACKET_ID) {
65  if (s->pb->eof_reached) {
66  av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
67  return -1;
68  }
69  state = (state << 8) | avio_r8(s->pb);
70  }
71  return 0;
72 }
73 
74 /* first is true if we read the frame header */
76  uint8_t *buf, int size, int header)
77 {
78  FFMContext *ffm = s->priv_data;
79  AVIOContext *pb = s->pb;
80  int len, fill_size, size1, frame_offset, id;
81 
82  size1 = size;
83  while (size > 0) {
84  redo:
85  len = ffm->packet_end - ffm->packet_ptr;
86  if (len < 0)
87  return -1;
88  if (len > size)
89  len = size;
90  if (len == 0) {
91  if (avio_tell(pb) == ffm->file_size)
92  avio_seek(pb, ffm->packet_size, SEEK_SET);
93  retry_read:
94  id = avio_rb16(pb); /* PACKET_ID */
95  if (id != PACKET_ID)
96  if (ffm_resync(s, id) < 0)
97  return -1;
98  fill_size = avio_rb16(pb);
99  ffm->dts = avio_rb64(pb);
100  frame_offset = avio_rb16(pb);
101  avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
102  ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
103  if (ffm->packet_end < ffm->packet || frame_offset < 0)
104  return -1;
105  /* if first packet or resynchronization packet, we must
106  handle it specifically */
107  if (ffm->first_packet || (frame_offset & 0x8000)) {
108  if (!frame_offset) {
109  /* This packet has no frame headers in it */
110  if (avio_tell(pb) >= ffm->packet_size * 3) {
111  avio_seek(pb, -ffm->packet_size * 2, SEEK_CUR);
112  goto retry_read;
113  }
114  /* This is bad, we cannot find a valid frame header */
115  return 0;
116  }
117  ffm->first_packet = 0;
118  if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
119  return -1;
120  ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
121  if (!header)
122  break;
123  } else {
124  ffm->packet_ptr = ffm->packet;
125  }
126  goto redo;
127  }
128  memcpy(buf, ffm->packet_ptr, len);
129  buf += len;
130  ffm->packet_ptr += len;
131  size -= len;
132  header = 0;
133  }
134  return size1 - size;
135 }
136 
137 /* ensure that acutal seeking happens between FFM_PACKET_SIZE
138  and file_size - FFM_PACKET_SIZE */
139 static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
140 {
141  FFMContext *ffm = s->priv_data;
142  AVIOContext *pb = s->pb;
143  int64_t pos;
144 
145  pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
146  pos = FFMAX(pos, FFM_PACKET_SIZE);
147  av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
148  return avio_seek(pb, pos, SEEK_SET);
149 }
150 
151 static int64_t get_dts(AVFormatContext *s, int64_t pos)
152 {
153  AVIOContext *pb = s->pb;
154  int64_t dts;
155 
156  ffm_seek1(s, pos);
157  avio_skip(pb, 4);
158  dts = avio_rb64(pb);
159  av_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
160  return dts;
161 }
162 
164 {
165  FFMContext *ffm = s->priv_data;
166  AVIOContext *pb = s->pb;
167  int64_t pts;
168  //int64_t orig_write_index = ffm->write_index;
169  int64_t pos_min, pos_max;
170  int64_t pts_start;
171  int64_t ptr = avio_tell(pb);
172 
173 
174  pos_min = 0;
175  pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
176 
177  pts_start = get_dts(s, pos_min);
178 
179  pts = get_dts(s, pos_max);
180 
181  if (pts - 100000 > pts_start)
182  goto end;
183 
185 
186  pts_start = get_dts(s, pos_min);
187 
188  pts = get_dts(s, pos_max);
189 
190  if (pts - 100000 <= pts_start) {
191  while (1) {
192  int64_t newpos;
193  int64_t newpts;
194 
195  newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
196 
197  if (newpos == pos_min)
198  break;
199 
200  newpts = get_dts(s, newpos);
201 
202  if (newpts - 100000 <= pts) {
203  pos_max = newpos;
204  pts = newpts;
205  } else {
206  pos_min = newpos;
207  }
208  }
209  ffm->write_index += pos_max;
210  }
211 
212  end:
213  avio_seek(pb, ptr, SEEK_SET);
214 }
215 
216 
218 {
219  int i;
220 
221  for (i = 0; i < s->nb_streams; i++)
222  av_freep(&s->streams[i]->codec->rc_eq);
223 
224  return 0;
225 }
226 
227 
229 {
230  FFMContext *ffm = s->priv_data;
231  AVStream *st;
232  AVIOContext *pb = s->pb;
233  AVCodecContext *codec;
234  int i, nb_streams;
235  uint32_t tag;
236 
237  /* header */
238  tag = avio_rl32(pb);
239  if (tag != MKTAG('F', 'F', 'M', '1'))
240  goto fail;
241  ffm->packet_size = avio_rb32(pb);
242  if (ffm->packet_size != FFM_PACKET_SIZE)
243  goto fail;
244  ffm->write_index = avio_rb64(pb);
245  /* get also filesize */
246  if (pb->seekable) {
247  ffm->file_size = avio_size(pb);
248  if (ffm->write_index)
250  } else {
251  ffm->file_size = (UINT64_C(1) << 63) - 1;
252  }
253 
254  nb_streams = avio_rb32(pb);
255  avio_rb32(pb); /* total bitrate */
256  /* read each stream */
257  for(i=0;i<nb_streams;i++) {
258  char rc_eq_buf[128];
259 
260  st = avformat_new_stream(s, NULL);
261  if (!st)
262  goto fail;
263 
264  avpriv_set_pts_info(st, 64, 1, 1000000);
265 
266  codec = st->codec;
267  /* generic info */
268  codec->codec_id = avio_rb32(pb);
269  codec->codec_type = avio_r8(pb); /* codec_type */
270  codec->bit_rate = avio_rb32(pb);
271  codec->flags = avio_rb32(pb);
272  codec->flags2 = avio_rb32(pb);
273  codec->debug = avio_rb32(pb);
274  /* specific info */
275  switch(codec->codec_type) {
276  case AVMEDIA_TYPE_VIDEO:
277  codec->time_base.num = avio_rb32(pb);
278  codec->time_base.den = avio_rb32(pb);
279  codec->width = avio_rb16(pb);
280  codec->height = avio_rb16(pb);
281  codec->gop_size = avio_rb16(pb);
282  codec->pix_fmt = avio_rb32(pb);
283  codec->qmin = avio_r8(pb);
284  codec->qmax = avio_r8(pb);
285  codec->max_qdiff = avio_r8(pb);
286  codec->qcompress = avio_rb16(pb) / 10000.0;
287  codec->qblur = avio_rb16(pb) / 10000.0;
288  codec->bit_rate_tolerance = avio_rb32(pb);
289  avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
290  codec->rc_eq = av_strdup(rc_eq_buf);
291  codec->rc_max_rate = avio_rb32(pb);
292  codec->rc_min_rate = avio_rb32(pb);
293  codec->rc_buffer_size = avio_rb32(pb);
294  codec->i_quant_factor = av_int2double(avio_rb64(pb));
295  codec->b_quant_factor = av_int2double(avio_rb64(pb));
296  codec->i_quant_offset = av_int2double(avio_rb64(pb));
297  codec->b_quant_offset = av_int2double(avio_rb64(pb));
298  codec->dct_algo = avio_rb32(pb);
299  codec->strict_std_compliance = avio_rb32(pb);
300  codec->max_b_frames = avio_rb32(pb);
301  codec->mpeg_quant = avio_rb32(pb);
302  codec->intra_dc_precision = avio_rb32(pb);
303  codec->me_method = avio_rb32(pb);
304  codec->mb_decision = avio_rb32(pb);
305  codec->nsse_weight = avio_rb32(pb);
306  codec->frame_skip_cmp = avio_rb32(pb);
308  codec->codec_tag = avio_rb32(pb);
309  codec->thread_count = avio_r8(pb);
310  codec->coder_type = avio_rb32(pb);
311  codec->me_cmp = avio_rb32(pb);
312  codec->me_subpel_quality = avio_rb32(pb);
313  codec->me_range = avio_rb32(pb);
314  codec->keyint_min = avio_rb32(pb);
315  codec->scenechange_threshold = avio_rb32(pb);
316  codec->b_frame_strategy = avio_rb32(pb);
317  codec->qcompress = av_int2double(avio_rb64(pb));
318  codec->qblur = av_int2double(avio_rb64(pb));
319  codec->max_qdiff = avio_rb32(pb);
320  codec->refs = avio_rb32(pb);
321  break;
322  case AVMEDIA_TYPE_AUDIO:
323  codec->sample_rate = avio_rb32(pb);
324  codec->channels = avio_rl16(pb);
325  codec->frame_size = avio_rl16(pb);
326  break;
327  default:
328  goto fail;
329  }
330  if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
331  codec->extradata_size = avio_rb32(pb);
332  codec->extradata = av_malloc(codec->extradata_size);
333  if (!codec->extradata)
334  return AVERROR(ENOMEM);
335  avio_read(pb, codec->extradata, codec->extradata_size);
336  }
337  }
338 
339  /* get until end of block reached */
340  while ((avio_tell(pb) % ffm->packet_size) != 0)
341  avio_r8(pb);
342 
343  /* init packet demux */
344  ffm->packet_ptr = ffm->packet;
345  ffm->packet_end = ffm->packet;
346  ffm->frame_offset = 0;
347  ffm->dts = 0;
348  ffm->read_state = READ_HEADER;
349  ffm->first_packet = 1;
350  return 0;
351  fail:
352  ffm_close(s);
353  return -1;
354 }
355 
356 /* return < 0 if eof */
358 {
359  int size;
360  FFMContext *ffm = s->priv_data;
361  int duration, ret;
362 
363  switch(ffm->read_state) {
364  case READ_HEADER:
365  if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
366  return ret;
367 
368  av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
369  avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
370  if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
372  return -1;
373  if (ffm->header[1] & FLAG_DTS)
374  if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
375  return -1;
376  ffm->read_state = READ_DATA;
377  /* fall thru */
378  case READ_DATA:
379  size = AV_RB24(ffm->header + 2);
380  if ((ret = ffm_is_avail_data(s, size)) < 0)
381  return ret;
382 
383  duration = AV_RB24(ffm->header + 5);
384 
385  av_new_packet(pkt, size);
386  pkt->stream_index = ffm->header[0];
387  if ((unsigned)pkt->stream_index >= s->nb_streams) {
388  av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
389  av_free_packet(pkt);
390  ffm->read_state = READ_HEADER;
391  return -1;
392  }
393  pkt->pos = avio_tell(s->pb);
394  if (ffm->header[1] & FLAG_KEY_FRAME)
395  pkt->flags |= AV_PKT_FLAG_KEY;
396 
397  ffm->read_state = READ_HEADER;
398  if (ffm_read_data(s, pkt->data, size, 0) != size) {
399  /* bad case: desynchronized packet. we cancel all the packet loading */
400  av_free_packet(pkt);
401  return -1;
402  }
403  pkt->pts = AV_RB64(ffm->header+8);
404  if (ffm->header[1] & FLAG_DTS)
405  pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
406  else
407  pkt->dts = pkt->pts;
408  pkt->duration = duration;
409  break;
410  }
411  return 0;
412 }
413 
414 /* seek to a given time in the file. The file read pointer is
415  positioned at or before pts. XXX: the following code is quite
416  approximative */
417 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
418 {
419  FFMContext *ffm = s->priv_data;
420  int64_t pos_min, pos_max, pos;
421  int64_t pts_min, pts_max, pts;
422  double pos1;
423 
424  av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
425  /* find the position using linear interpolation (better than
426  dichotomy in typical cases) */
427  pos_min = FFM_PACKET_SIZE;
428  pos_max = ffm->file_size - FFM_PACKET_SIZE;
429  while (pos_min <= pos_max) {
430  pts_min = get_dts(s, pos_min);
431  pts_max = get_dts(s, pos_max);
432  /* linear interpolation */
433  pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
434  (double)(pts_max - pts_min);
435  pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
436  if (pos <= pos_min)
437  pos = pos_min;
438  else if (pos >= pos_max)
439  pos = pos_max;
440  pts = get_dts(s, pos);
441  /* check if we are lucky */
442  if (pts == wanted_pts) {
443  goto found;
444  } else if (pts > wanted_pts) {
445  pos_max = pos - FFM_PACKET_SIZE;
446  } else {
447  pos_min = pos + FFM_PACKET_SIZE;
448  }
449  }
450  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
451 
452  found:
453  if (ffm_seek1(s, pos) < 0)
454  return -1;
455 
456  /* reset read state */
457  ffm->read_state = READ_HEADER;
458  ffm->packet_ptr = ffm->packet;
459  ffm->packet_end = ffm->packet;
460  ffm->first_packet = 1;
461 
462  return 0;
463 }
464 
465 static int ffm_probe(AVProbeData *p)
466 {
467  if (
468  p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
469  p->buf[3] == '1')
470  return AVPROBE_SCORE_MAX + 1;
471  return 0;
472 }
473 
475  .name = "ffm",
476  .long_name = NULL_IF_CONFIG_SMALL("FFM (AVserver live feed)"),
477  .priv_data_size = sizeof(FFMContext),
482  .read_seek = ffm_seek,
483 };
#define FRAME_HEADER_SIZE
Definition: asfdec.c:99
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:1518
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
Definition: ffm.h:41
Bytestream IO Context.
Definition: avio.h:68
#define PACKET_ID
Definition: ffm.h:32
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:241
int64_t dts
Definition: ffm.h:54
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:242
int mpeg_quant
0-> h263 quant 1-> mpeg quant
Definition: avcodec.h:1339
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:2443
enum AVCodecID id
Definition: mxfenc.c:84
int frame_offset
Definition: ffm.h:53
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2054
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1002
#define AV_RB64
Definition: intreadwrite.h:164
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:3208
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:1302
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
int num
numerator
Definition: rational.h:44
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
#define AV_RB24
Definition: intreadwrite.h:64
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
#define FLAG_DTS
Definition: ffm.h:37
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:574
int frame_skip_cmp
frame skip comparison function
Definition: avcodec.h:2213
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ffmdec.c:357
static int ffm_read_data(AVFormatContext *s, uint8_t *buf, int size, int header)
Definition: ffmdec.c:75
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1355
static int64_t duration
Definition: avplay.c:246
int scenechange_threshold
scene change detection threshold 0 is default, larger means fewer detected scene changes.
Definition: avcodec.h:1596
#define FFM_HEADER_SIZE
Definition: ffm.h:30
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1173
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
static int ffm_resync(AVFormatContext *s, int state)
Definition: ffmdec.c:61
Format I/O context.
Definition: avformat.h:871
int64_t file_size
Definition: ffm.h:46
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1120
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
static int64_t get_dts(AVFormatContext *s, int64_t pos)
Definition: ffmdec.c:151
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:1529
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:589
#define CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
Definition: avcodec.h:684
#define AV_RB32
Definition: intreadwrite.h:130
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:1311
uint8_t * packet_end
Definition: ffm.h:55
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1162
int me_cmp
motion estimation comparison function
Definition: avcodec.h:1429
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:935
static int ffm_is_avail_data(AVFormatContext *s, int size)
Definition: ffmdec.c:30
int coder_type
coder type
Definition: avcodec.h:2164
uint8_t * data
Definition: avcodec.h:973
static int flags
Definition: log.c:44
uint32_t tag
Definition: movenc.c:822
#define AVERROR_EOF
End of file.
Definition: error.h:51
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:654
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:995
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:446
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1023
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:80
uint8_t * packet_ptr
Definition: ffm.h:55
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
static void adjust_write_index(AVFormatContext *s)
Definition: ffmdec.c:163
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:558
#define AVERROR(e)
Definition: error.h:43
int qmax
maximum quantizer
Definition: avcodec.h:2068
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1142
int rc_max_rate
maximum bitrate
Definition: avcodec.h:2115
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2662
float i_quant_factor
qscale factor between P and I-frames If > 0 then the last p frame quantizer will be used (q= lastp_q*...
Definition: avcodec.h:1348
const char * rc_eq
rate control equation
Definition: avcodec.h:2108
static int ffm_probe(AVProbeData *p)
Definition: ffmdec.c:465
#define FFMAX(a, b)
Definition: common.h:55
int first_packet
Definition: ffm.h:51
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:979
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:437
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:702
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2093
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:1626
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:390
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:923
int refs
number of reference frames
Definition: avcodec.h:1697
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:117
int bit_rate
the average bitrate
Definition: avcodec.h:1112
#define FFMIN(a, b)
Definition: common.h:57
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1217
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
int b_frame_strategy
Definition: avcodec.h:1317
uint8_t header[FRAME_HEADER_SIZE+4]
Definition: ffm.h:48
int mb_decision
macroblock decision mode
Definition: avcodec.h:1571
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2075
int packet_size
Definition: ffm.h:52
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:2514
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:536
Stream structure.
Definition: avformat.h:683
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1799
NULL
Definition: eval.c:55
static int ffm_close(AVFormatContext *s)
Definition: ffmdec.c:217
enum AVMediaType codec_type
Definition: avcodec.h:1062
enum AVCodecID codec_id
Definition: avcodec.h:1065
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:213
int sample_rate
samples per second
Definition: avcodec.h:1779
AVIOContext * pb
I/O context.
Definition: avformat.h:913
int debug
debug
Definition: avcodec.h:2348
Definition: ffm.h:44
main external API structure.
Definition: avcodec.h:1054
int qmin
minimum quantizer
Definition: avcodec.h:2061
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1080
int extradata_size
Definition: avcodec.h:1163
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
float rc_buffer_aggressivity
Definition: avcodec.h:2124
static int ffm_read_header(AVFormatContext *s)
Definition: ffmdec.c:228
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1324
This structure contains the data a format has to probe a file.
Definition: avformat.h:388
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2053
static uint32_t state
Definition: trasher.c:27
AVInputFormat ff_ffm_demuxer
Definition: ffmdec.c:474
static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
Definition: ffmdec.c:139
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1238
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:395
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:542
Main libavformat public API header.
uint8_t packet[FFM_PACKET_SIZE]
Definition: ffm.h:56
int nsse_weight
noise vs.
Definition: avcodec.h:2589
int64_t pos
position in the file of the current buffer
Definition: avio.h:94
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
Definition: ffmdec.c:417
int den
denominator
Definition: rational.h:45
int eof_reached
true if eof reached
Definition: avio.h:96
int len
int channels
number of audio channels
Definition: avcodec.h:1780
void * priv_data
Format private data.
Definition: avformat.h:899
int read_state
Definition: ffm.h:47
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:1149
int64_t write_index
Definition: ffm.h:46
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:972
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:516
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:612
int me_method
Motion estimation algorithm used for video coding.
Definition: avcodec.h:1256
int stream_index
Definition: avcodec.h:975
int rc_min_rate
minimum bitrate
Definition: avcodec.h:2122
#define MKTAG(a, b, c, d)
Definition: common.h:238
This structure stores compressed data.
Definition: avcodec.h:950
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:1503
#define FLAG_KEY_FRAME
Definition: ffm.h:36
int strict_std_compliance
strictly follow the standard (MPEG4, ...).
Definition: avcodec.h:2327
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966
#define FFM_PACKET_SIZE
Definition: ffm.h:31
int keyint_min
minimum GOP size
Definition: avcodec.h:1690