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 "libavutil/intreadwrite.h"
23 #include "libavutil/intfloat.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "ffm.h"
27 #if CONFIG_AVSERVER
28 #include <unistd.h>
29 
30 int64_t ffm_read_write_index(int fd)
31 {
32  uint8_t buf[8];
33 
34  lseek(fd, 8, SEEK_SET);
35  if (read(fd, buf, 8) != 8)
36  return AVERROR(EIO);
37  return AV_RB64(buf);
38 }
39 
40 int ffm_write_write_index(int fd, int64_t pos)
41 {
42  uint8_t buf[8];
43  int i;
44 
45  for(i=0;i<8;i++)
46  buf[i] = (pos >> (56 - i * 8)) & 0xff;
47  lseek(fd, 8, SEEK_SET);
48  if (write(fd, buf, 8) != 8)
49  return AVERROR(EIO);
50  return 8;
51 }
52 
53 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size)
54 {
55  FFMContext *ffm = s->priv_data;
56  ffm->write_index = pos;
57  ffm->file_size = file_size;
58 }
59 #endif // CONFIG_AVSERVER
60 
62 {
63  FFMContext *ffm = s->priv_data;
64  int64_t pos, avail_size;
65  int len;
66 
67  len = ffm->packet_end - ffm->packet_ptr;
68  if (size <= len)
69  return 1;
70  pos = avio_tell(s->pb);
71  if (!ffm->write_index) {
72  if (pos == ffm->file_size)
73  return AVERROR_EOF;
74  avail_size = ffm->file_size - pos;
75  } else {
76  if (pos == ffm->write_index) {
77  /* exactly at the end of stream */
78  return AVERROR(EAGAIN);
79  } else if (pos < ffm->write_index) {
80  avail_size = ffm->write_index - pos;
81  } else {
82  avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
83  }
84  }
85  avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
86  if (size <= avail_size)
87  return 1;
88  else
89  return AVERROR(EAGAIN);
90 }
91 
92 static int ffm_resync(AVFormatContext *s, int state)
93 {
94  av_log(s, AV_LOG_ERROR, "resyncing\n");
95  while (state != PACKET_ID) {
96  if (s->pb->eof_reached) {
97  av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
98  return -1;
99  }
100  state = (state << 8) | avio_r8(s->pb);
101  }
102  return 0;
103 }
104 
105 /* first is true if we read the frame header */
107  uint8_t *buf, int size, int header)
108 {
109  FFMContext *ffm = s->priv_data;
110  AVIOContext *pb = s->pb;
111  int len, fill_size, size1, frame_offset, id;
112 
113  size1 = size;
114  while (size > 0) {
115  redo:
116  len = ffm->packet_end - ffm->packet_ptr;
117  if (len < 0)
118  return -1;
119  if (len > size)
120  len = size;
121  if (len == 0) {
122  if (avio_tell(pb) == ffm->file_size)
123  avio_seek(pb, ffm->packet_size, SEEK_SET);
124  retry_read:
125  id = avio_rb16(pb); /* PACKET_ID */
126  if (id != PACKET_ID)
127  if (ffm_resync(s, id) < 0)
128  return -1;
129  fill_size = avio_rb16(pb);
130  ffm->dts = avio_rb64(pb);
131  frame_offset = avio_rb16(pb);
132  avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
133  ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
134  if (ffm->packet_end < ffm->packet || frame_offset < 0)
135  return -1;
136  /* if first packet or resynchronization packet, we must
137  handle it specifically */
138  if (ffm->first_packet || (frame_offset & 0x8000)) {
139  if (!frame_offset) {
140  /* This packet has no frame headers in it */
141  if (avio_tell(pb) >= ffm->packet_size * 3) {
142  avio_seek(pb, -ffm->packet_size * 2, SEEK_CUR);
143  goto retry_read;
144  }
145  /* This is bad, we cannot find a valid frame header */
146  return 0;
147  }
148  ffm->first_packet = 0;
149  if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
150  return -1;
151  ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
152  if (!header)
153  break;
154  } else {
155  ffm->packet_ptr = ffm->packet;
156  }
157  goto redo;
158  }
159  memcpy(buf, ffm->packet_ptr, len);
160  buf += len;
161  ffm->packet_ptr += len;
162  size -= len;
163  header = 0;
164  }
165  return size1 - size;
166 }
167 
168 /* ensure that acutal seeking happens between FFM_PACKET_SIZE
169  and file_size - FFM_PACKET_SIZE */
170 static void ffm_seek1(AVFormatContext *s, int64_t pos1)
171 {
172  FFMContext *ffm = s->priv_data;
173  AVIOContext *pb = s->pb;
174  int64_t pos;
175 
176  pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
177  pos = FFMAX(pos, FFM_PACKET_SIZE);
178  av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
179  avio_seek(pb, pos, SEEK_SET);
180 }
181 
182 static int64_t get_dts(AVFormatContext *s, int64_t pos)
183 {
184  AVIOContext *pb = s->pb;
185  int64_t dts;
186 
187  ffm_seek1(s, pos);
188  avio_skip(pb, 4);
189  dts = avio_rb64(pb);
190  av_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
191  return dts;
192 }
193 
195 {
196  FFMContext *ffm = s->priv_data;
197  AVIOContext *pb = s->pb;
198  int64_t pts;
199  //int64_t orig_write_index = ffm->write_index;
200  int64_t pos_min, pos_max;
201  int64_t pts_start;
202  int64_t ptr = avio_tell(pb);
203 
204 
205  pos_min = 0;
206  pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
207 
208  pts_start = get_dts(s, pos_min);
209 
210  pts = get_dts(s, pos_max);
211 
212  if (pts - 100000 > pts_start)
213  goto end;
214 
216 
217  pts_start = get_dts(s, pos_min);
218 
219  pts = get_dts(s, pos_max);
220 
221  if (pts - 100000 <= pts_start) {
222  while (1) {
223  int64_t newpos;
224  int64_t newpts;
225 
226  newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
227 
228  if (newpos == pos_min)
229  break;
230 
231  newpts = get_dts(s, newpos);
232 
233  if (newpts - 100000 <= pts) {
234  pos_max = newpos;
235  pts = newpts;
236  } else {
237  pos_min = newpos;
238  }
239  }
240  ffm->write_index += pos_max;
241  }
242 
243  //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
244  //printf("pts range %0.6f - %0.6f\n", get_dts(s, 0) / 1000000. , get_dts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
245 
246  end:
247  avio_seek(pb, ptr, SEEK_SET);
248 }
249 
250 
252 {
253  int i;
254 
255  for (i = 0; i < s->nb_streams; i++)
256  av_freep(&s->streams[i]->codec->rc_eq);
257 
258  return 0;
259 }
260 
261 
263 {
264  FFMContext *ffm = s->priv_data;
265  AVStream *st;
266  AVIOContext *pb = s->pb;
267  AVCodecContext *codec;
268  int i, nb_streams;
269  uint32_t tag;
270 
271  /* header */
272  tag = avio_rl32(pb);
273  if (tag != MKTAG('F', 'F', 'M', '1'))
274  goto fail;
275  ffm->packet_size = avio_rb32(pb);
276  if (ffm->packet_size != FFM_PACKET_SIZE)
277  goto fail;
278  ffm->write_index = avio_rb64(pb);
279  /* get also filesize */
280  if (pb->seekable) {
281  ffm->file_size = avio_size(pb);
282  if (ffm->write_index)
284  } else {
285  ffm->file_size = (UINT64_C(1) << 63) - 1;
286  }
287 
288  nb_streams = avio_rb32(pb);
289  avio_rb32(pb); /* total bitrate */
290  /* read each stream */
291  for(i=0;i<nb_streams;i++) {
292  char rc_eq_buf[128];
293 
294  st = avformat_new_stream(s, NULL);
295  if (!st)
296  goto fail;
297 
298  avpriv_set_pts_info(st, 64, 1, 1000000);
299 
300  codec = st->codec;
301  /* generic info */
302  codec->codec_id = avio_rb32(pb);
303  codec->codec_type = avio_r8(pb); /* codec_type */
304  codec->bit_rate = avio_rb32(pb);
305  codec->flags = avio_rb32(pb);
306  codec->flags2 = avio_rb32(pb);
307  codec->debug = avio_rb32(pb);
308  /* specific info */
309  switch(codec->codec_type) {
310  case AVMEDIA_TYPE_VIDEO:
311  codec->time_base.num = avio_rb32(pb);
312  codec->time_base.den = avio_rb32(pb);
313  codec->width = avio_rb16(pb);
314  codec->height = avio_rb16(pb);
315  codec->gop_size = avio_rb16(pb);
316  codec->pix_fmt = avio_rb32(pb);
317  codec->qmin = avio_r8(pb);
318  codec->qmax = avio_r8(pb);
319  codec->max_qdiff = avio_r8(pb);
320  codec->qcompress = avio_rb16(pb) / 10000.0;
321  codec->qblur = avio_rb16(pb) / 10000.0;
322  codec->bit_rate_tolerance = avio_rb32(pb);
323  avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
324  codec->rc_eq = av_strdup(rc_eq_buf);
325  codec->rc_max_rate = avio_rb32(pb);
326  codec->rc_min_rate = avio_rb32(pb);
327  codec->rc_buffer_size = avio_rb32(pb);
328  codec->i_quant_factor = av_int2double(avio_rb64(pb));
329  codec->b_quant_factor = av_int2double(avio_rb64(pb));
330  codec->i_quant_offset = av_int2double(avio_rb64(pb));
331  codec->b_quant_offset = av_int2double(avio_rb64(pb));
332  codec->dct_algo = avio_rb32(pb);
333  codec->strict_std_compliance = avio_rb32(pb);
334  codec->max_b_frames = avio_rb32(pb);
335  codec->luma_elim_threshold = avio_rb32(pb);
336  codec->chroma_elim_threshold = avio_rb32(pb);
337  codec->mpeg_quant = avio_rb32(pb);
338  codec->intra_dc_precision = avio_rb32(pb);
339  codec->me_method = avio_rb32(pb);
340  codec->mb_decision = avio_rb32(pb);
341  codec->nsse_weight = avio_rb32(pb);
342  codec->frame_skip_cmp = avio_rb32(pb);
344  codec->codec_tag = avio_rb32(pb);
345  codec->thread_count = avio_r8(pb);
346  codec->coder_type = avio_rb32(pb);
347  codec->me_cmp = avio_rb32(pb);
348  codec->me_subpel_quality = avio_rb32(pb);
349  codec->me_range = avio_rb32(pb);
350  codec->keyint_min = avio_rb32(pb);
351  codec->scenechange_threshold = avio_rb32(pb);
352  codec->b_frame_strategy = avio_rb32(pb);
353  codec->qcompress = av_int2double(avio_rb64(pb));
354  codec->qblur = av_int2double(avio_rb64(pb));
355  codec->max_qdiff = avio_rb32(pb);
356  codec->refs = avio_rb32(pb);
357  break;
358  case AVMEDIA_TYPE_AUDIO:
359  codec->sample_rate = avio_rb32(pb);
360  codec->channels = avio_rl16(pb);
361  codec->frame_size = avio_rl16(pb);
362  codec->sample_fmt = (int16_t) avio_rl16(pb);
363  break;
364  default:
365  goto fail;
366  }
367  if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
368  codec->extradata_size = avio_rb32(pb);
369  codec->extradata = av_malloc(codec->extradata_size);
370  if (!codec->extradata)
371  return AVERROR(ENOMEM);
372  avio_read(pb, codec->extradata, codec->extradata_size);
373  }
374  }
375 
376  /* get until end of block reached */
377  while ((avio_tell(pb) % ffm->packet_size) != 0)
378  avio_r8(pb);
379 
380  /* init packet demux */
381  ffm->packet_ptr = ffm->packet;
382  ffm->packet_end = ffm->packet;
383  ffm->frame_offset = 0;
384  ffm->dts = 0;
385  ffm->read_state = READ_HEADER;
386  ffm->first_packet = 1;
387  return 0;
388  fail:
389  ffm_close(s);
390  return -1;
391 }
392 
393 /* return < 0 if eof */
395 {
396  int size;
397  FFMContext *ffm = s->priv_data;
398  int duration, ret;
399 
400  switch(ffm->read_state) {
401  case READ_HEADER:
402  if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
403  return ret;
404 
405  av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
406  avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
407  if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
409  return -1;
410  if (ffm->header[1] & FLAG_DTS)
411  if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
412  return -1;
413  ffm->read_state = READ_DATA;
414  /* fall thru */
415  case READ_DATA:
416  size = AV_RB24(ffm->header + 2);
417  if ((ret = ffm_is_avail_data(s, size)) < 0)
418  return ret;
419 
420  duration = AV_RB24(ffm->header + 5);
421 
422  av_new_packet(pkt, size);
423  pkt->stream_index = ffm->header[0];
424  if ((unsigned)pkt->stream_index >= s->nb_streams) {
425  av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
426  av_free_packet(pkt);
427  ffm->read_state = READ_HEADER;
428  return -1;
429  }
430  pkt->pos = avio_tell(s->pb);
431  if (ffm->header[1] & FLAG_KEY_FRAME)
432  pkt->flags |= AV_PKT_FLAG_KEY;
433 
434  ffm->read_state = READ_HEADER;
435  if (ffm_read_data(s, pkt->data, size, 0) != size) {
436  /* bad case: desynchronized packet. we cancel all the packet loading */
437  av_free_packet(pkt);
438  return -1;
439  }
440  pkt->pts = AV_RB64(ffm->header+8);
441  if (ffm->header[1] & FLAG_DTS)
442  pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
443  else
444  pkt->dts = pkt->pts;
445  pkt->duration = duration;
446  break;
447  }
448  return 0;
449 }
450 
451 /* seek to a given time in the file. The file read pointer is
452  positioned at or before pts. XXX: the following code is quite
453  approximative */
454 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
455 {
456  FFMContext *ffm = s->priv_data;
457  int64_t pos_min, pos_max, pos;
458  int64_t pts_min, pts_max, pts;
459  double pos1;
460 
461  av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
462  /* find the position using linear interpolation (better than
463  dichotomy in typical cases) */
464  pos_min = FFM_PACKET_SIZE;
465  pos_max = ffm->file_size - FFM_PACKET_SIZE;
466  while (pos_min <= pos_max) {
467  pts_min = get_dts(s, pos_min);
468  pts_max = get_dts(s, pos_max);
469  /* linear interpolation */
470  pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
471  (double)(pts_max - pts_min);
472  pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
473  if (pos <= pos_min)
474  pos = pos_min;
475  else if (pos >= pos_max)
476  pos = pos_max;
477  pts = get_dts(s, pos);
478  /* check if we are lucky */
479  if (pts == wanted_pts) {
480  goto found;
481  } else if (pts > wanted_pts) {
482  pos_max = pos - FFM_PACKET_SIZE;
483  } else {
484  pos_min = pos + FFM_PACKET_SIZE;
485  }
486  }
487  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
488 
489  found:
490  ffm_seek1(s, pos);
491 
492  /* reset read state */
493  ffm->read_state = READ_HEADER;
494  ffm->packet_ptr = ffm->packet;
495  ffm->packet_end = ffm->packet;
496  ffm->first_packet = 1;
497 
498  return 0;
499 }
500 
501 static int ffm_probe(AVProbeData *p)
502 {
503  if (
504  p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
505  p->buf[3] == '1')
506  return AVPROBE_SCORE_MAX + 1;
507  return 0;
508 }
509 
511  .name = "ffm",
512  .long_name = NULL_IF_CONFIG_SMALL("FFM (AVserver live feed) format"),
513  .priv_data_size = sizeof(FFMContext),
518  .read_seek = ffm_seek,
519 };
#define FRAME_HEADER_SIZE
Definition: asfdec.c:82
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:1618
enum PixelFormat pix_fmt
Pixel format, see PIX_FMT_xxx.
Definition: avcodec.h:1426
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:281
struct FFMContext FFMContext
int64_t dts
Definition: ffm.h:54
int size
int mpeg_quant
0-> h263 quant 1-> mpeg quant
Definition: avcodec.h:1768
AV_WL32 AV_WL24 AV_WL16 AV_RB32
Definition: bytestream.h:89
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:1861
int frame_offset
Definition: ffm.h:53
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:1483
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:933
#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 pts for a given stream.
Definition: utils.c:3828
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:60
int chroma_elim_threshold
chroma single coeff elimination threshold
Definition: avcodec.h:1628
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:1512
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:148
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:211
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:954
#define FLAG_DTS
Definition: ffm.h:37
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:754
int frame_skip_cmp
frame skip comparison function
Definition: avcodec.h:2571
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ffmdec.c:394
static int ffm_read_data(AVFormatContext *s, uint8_t *buf, int size, int header)
Definition: ffmdec.c:106
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1847
static int64_t duration
Definition: avplay.c:241
int scenechange_threshold
scene change detection threshold 0 is default, larger means fewer detected scene changes.
Definition: avcodec.h:2292
#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:1398
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:147
static int ffm_resync(AVFormatContext *s, int state)
Definition: ffmdec.c:92
Format I/O context.
Definition: avformat.h:863
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:1348
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1464
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:58
static int64_t get_dts(AVFormatContext *s, int64_t pos)
Definition: ffmdec.c:182
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:2161
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:769
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:1521
uint8_t * packet_end
Definition: ffm.h:55
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1387
int me_cmp
motion estimation comparison function
Definition: avcodec.h:2048
AVStream ** streams
Definition: avformat.h:908
static int read_header(FFV1Context *f)
Definition: ffv1.c:1513
static int ffm_is_avail_data(AVFormatContext *s, int size)
Definition: ffmdec.c:61
int coder_type
coder type
Definition: avcodec.h:2220
uint8_t * data
Definition: avcodec.h:908
static int flags
Definition: log.c:34
uint32_t tag
Definition: movenc.c:670
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:151
#define AVERROR_EOF
End of file.
Definition: error.h:51
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:140
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:842
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:492
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:930
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:652
uint8_t * packet_ptr
Definition: ffm.h:55
static void adjust_write_index(AVFormatContext *s)
Definition: ffmdec.c:194
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:738
#define AVERROR(e)
Definition: error.h:43
int qmax
maximum quantizer
Definition: avcodec.h:1497
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
Definition: ffmdec.c:262
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1355
int rc_max_rate
maximum bitrate
Definition: avcodec.h:1816
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2776
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:1840
const char * rc_eq
rate control equation
Definition: avcodec.h:1809
static int ffm_probe(AVProbeData *p)
Definition: ffmdec.c:501
int ffm_write_write_index(int fd, int64_t pos)
#define FFMAX(a, b)
Definition: common.h:53
int first_packet
Definition: ffm.h:51
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:914
Definition: ffm.h:41
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
AVCodecContext * codec
codec context
Definition: avformat.h:623
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:1830
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:2434
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:341
unsigned int nb_streams
A list of all streams in the file.
Definition: avformat.h:907
int refs
number of reference frames
Definition: avcodec.h:2667
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:122
int bit_rate
the average bitrate
Definition: avcodec.h:1340
#define FFMIN(a, b)
Definition: common.h:55
int width
picture width / height.
Definition: avcodec.h:1408
int64_t ffm_read_write_index(int fd)
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:483
int b_frame_strategy
Definition: avcodec.h:1527
static int read_probe(AVProbeData *p)
Definition: img2.c:185
uint8_t header[FRAME_HEADER_SIZE+4]
Definition: ffm.h:48
int mb_decision
macroblock decision mode
Definition: avcodec.h:2259
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:1504
int packet_size
Definition: ffm.h:52
#define av_dlog(pctx,...)
av_dlog macros Useful to print debug messages that shouldn't get compiled in normally.
Definition: log.h:158
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:2392
Stream structure.
Definition: avformat.h:620
int frame_size
Samples per packet, initialized when calling 'init'.
Definition: avcodec.h:1470
NULL
Definition: eval.c:50
static int ffm_close(AVFormatContext *s)
Definition: ffmdec.c:251
enum AVMediaType codec_type
Definition: avcodec.h:1574
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:162
int sample_rate
samples per second
Definition: avcodec.h:1456
AVIOContext * pb
Definition: avformat.h:896
int debug
debug
Definition: avcodec.h:2007
Definition: ffm.h:44
main external API structure.
Definition: avcodec.h:1329
int qmin
minimum quantizer
Definition: avcodec.h:1490
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1590
int extradata_size
Definition: avcodec.h:1388
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:109
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:64
#define CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
Definition: avcodec.h:648
float rc_buffer_aggressivity
Definition: avcodec.h:1831
static void ffm_seek1(AVFormatContext *s, int64_t pos1)
Definition: ffmdec.c:170
enum CodecID id
Definition: mxfenc.c:85
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1654
This structure contains the data a format has to probe a file.
Definition: avformat.h:339
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:1482
static uint32_t state
Definition: trasher.c:25
AVInputFormat ff_ffm_demuxer
Definition: ffmdec.c:510
AV_WL32 AV_WL24 AV_WL16 AV_WB32 AV_RB24
Definition: bytestream.h:89
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1417
#define AVPROBE_SCORE_MAX
maximum score, half of that is used for file-extension-based detection
Definition: avformat.h:345
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:722
Main libavformat public API header.
uint8_t packet[FFM_PACKET_SIZE]
Definition: ffm.h:56
int nsse_weight
noise vs.
Definition: avcodec.h:2441
int64_t pos
position in the file of the current buffer
Definition: avio.h:96
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
Definition: ffmdec.c:454
int den
denominator
Definition: rational.h:45
int eof_reached
true if eof reached
Definition: avio.h:98
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size)
int len
int channels
number of audio channels
Definition: avcodec.h:1457
void * priv_data
Format private data.
Definition: avformat.h:883
int read_state
Definition: ffm.h:47
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:2357
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:907
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:460
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:800
int me_method
Motion estimation algorithm used for video coding.
Definition: avcodec.h:1374
int stream_index
Definition: avcodec.h:910
int rc_min_rate
minimum bitrate
Definition: avcodec.h:1823
#define MKTAG(a, b, c, d)
Definition: common.h:231
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:2124
#define FLAG_KEY_FRAME
Definition: ffm.h:36
int strict_std_compliance
strictly follow the standard (MPEG4, ...).
Definition: avcodec.h:1642
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:901
#define FFM_PACKET_SIZE
Definition: ffm.h:31
int luma_elim_threshold
luma single coefficient elimination threshold
Definition: avcodec.h:1621
enum CodecID codec_id
Definition: avcodec.h:1575
int keyint_min
minimum GOP size
Definition: avcodec.h:2660