FFmpeg
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ffmdec.c
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1 /*
2  * FFM (ffserver live feed) demuxer
3  * Copyright (c) 2001 Fabrice Bellard
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 #include <stdint.h>
23 
24 #include "libavutil/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/intfloat.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/pixdesc.h"
31 #include "avformat.h"
32 #include "internal.h"
33 #include "ffm.h"
34 #include "avio_internal.h"
35 
37 {
38  FFMContext *ffm = s->priv_data;
39  int64_t pos, avail_size;
40  ptrdiff_t len;
41 
42  len = ffm->packet_end - ffm->packet_ptr;
43  if (size <= len)
44  return 1;
45  pos = avio_tell(s->pb);
46  if (!ffm->write_index) {
47  if (pos == ffm->file_size)
48  return AVERROR_EOF;
49  avail_size = ffm->file_size - pos;
50  } else {
51  if (pos == ffm->write_index) {
52  /* exactly at the end of stream */
53  if (ffm->server_attached)
54  return AVERROR(EAGAIN);
55  else
56  return AVERROR_INVALIDDATA;
57  } else if (pos < ffm->write_index) {
58  avail_size = ffm->write_index - pos;
59  } else {
60  avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
61  }
62  }
63  avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
64  if (size <= avail_size)
65  return 1;
66  else if (ffm->server_attached)
67  return AVERROR(EAGAIN);
68  else
69  return AVERROR_INVALIDDATA;
70 }
71 
72 static int ffm_resync(AVFormatContext *s, uint32_t state)
73 {
74  av_log(s, AV_LOG_ERROR, "resyncing\n");
75  while (state != PACKET_ID) {
76  if (avio_feof(s->pb)) {
77  av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
78  return -1;
79  }
80  state = (state << 8) | avio_r8(s->pb);
81  }
82  return 0;
83 }
84 
85 /* first is true if we read the frame header */
87  uint8_t *buf, int size, int header)
88 {
89  FFMContext *ffm = s->priv_data;
90  AVIOContext *pb = s->pb;
91  int fill_size, size1, frame_offset;
92  uint32_t id;
93  ptrdiff_t len;
94  int64_t last_pos = -1;
95 
96  size1 = size;
97  while (size > 0) {
98  redo:
99  len = ffm->packet_end - ffm->packet_ptr;
100  if (len < 0)
101  return -1;
102  if (len > size)
103  len = size;
104  if (len == 0) {
105  if (avio_tell(pb) == ffm->file_size) {
106  if (ffm->server_attached) {
107  avio_seek(pb, ffm->packet_size, SEEK_SET);
108  } else
109  return AVERROR_EOF;
110  }
111  retry_read:
112  if (pb->buffer_size != ffm->packet_size) {
113  int64_t tell = avio_tell(pb);
114  int ret = ffio_set_buf_size(pb, ffm->packet_size);
115  if (ret < 0)
116  return ret;
117  avio_seek(pb, tell, SEEK_SET);
118  }
119  id = avio_rb16(pb); /* PACKET_ID */
120  if (id != PACKET_ID) {
121  if (ffm_resync(s, id) < 0)
122  return -1;
123  last_pos = avio_tell(pb);
124  }
125  fill_size = avio_rb16(pb);
126  ffm->dts = avio_rb64(pb);
127  frame_offset = avio_rb16(pb);
128  avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
129  if (ffm->packet_size < FFM_HEADER_SIZE + fill_size || frame_offset < 0) {
130  return -1;
131  }
132  ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
133  /* if first packet or resynchronization packet, we must
134  handle it specifically */
135  if (ffm->first_packet || (frame_offset & 0x8000)) {
136  if (!frame_offset) {
137  /* This packet has no frame headers in it */
138  if (avio_tell(pb) >= ffm->packet_size * 3LL) {
139  int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos);
140  seekback = FFMAX(seekback, 0);
141  avio_seek(pb, -seekback, SEEK_CUR);
142  goto retry_read;
143  }
144  /* This is bad, we cannot find a valid frame header */
145  return 0;
146  }
147  ffm->first_packet = 0;
148  if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) {
149  ffm->packet_end = ffm->packet_ptr;
150  return -1;
151  }
152  ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
153  if (!header)
154  break;
155  } else {
156  ffm->packet_ptr = ffm->packet;
157  }
158  goto redo;
159  }
160  memcpy(buf, ffm->packet_ptr, len);
161  buf += len;
162  ffm->packet_ptr += len;
163  size -= len;
164  header = 0;
165  }
166  return size1 - size;
167 }
168 
169 /* ensure that actual seeking happens between FFM_PACKET_SIZE
170  and file_size - FFM_PACKET_SIZE */
171 static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
172 {
173  FFMContext *ffm = s->priv_data;
174  AVIOContext *pb = s->pb;
175  int64_t pos;
176 
177  pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
178  pos = FFMAX(pos, FFM_PACKET_SIZE);
179  ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
180  return avio_seek(pb, pos, SEEK_SET);
181 }
182 
183 static int64_t get_dts(AVFormatContext *s, int64_t pos)
184 {
185  AVIOContext *pb = s->pb;
186  int64_t dts;
187 
188  ffm_seek1(s, pos);
189  avio_skip(pb, 4);
190  dts = avio_rb64(pb);
191  ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
192  return dts;
193 }
194 
196 {
197  FFMContext *ffm = s->priv_data;
198  AVIOContext *pb = s->pb;
199  int64_t pts;
200  //int64_t orig_write_index = ffm->write_index;
201  int64_t pos_min, pos_max;
202  int64_t pts_start;
203  int64_t ptr = avio_tell(pb);
204 
205 
206  pos_min = 0;
207  pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
208 
209  pts_start = get_dts(s, pos_min);
210 
211  pts = get_dts(s, pos_max);
212 
213  if (pts - 100000 > pts_start)
214  goto end;
215 
217 
218  pts_start = get_dts(s, pos_min);
219 
220  pts = get_dts(s, pos_max);
221 
222  if (pts - 100000 <= pts_start) {
223  while (1) {
224  int64_t newpos;
225  int64_t newpts;
226 
227  newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
228 
229  if (newpos == pos_min)
230  break;
231 
232  newpts = get_dts(s, newpos);
233 
234  if (newpts - 100000 <= pts) {
235  pos_max = newpos;
236  pts = newpts;
237  } else {
238  pos_min = newpos;
239  }
240  }
241  ffm->write_index += pos_max;
242  }
243 
244  end:
245  avio_seek(pb, ptr, SEEK_SET);
246 }
247 
248 
250 {
251  int i;
252 
253  for (i = 0; i < s->nb_streams; i++)
254  av_freep(&s->streams[i]->codec->rc_eq);
255 
256  return 0;
257 }
258 
259 static int ffm_append_recommended_configuration(AVStream *st, char **conf)
260 {
261  int ret;
262  size_t newsize;
263  av_assert0(conf && st);
264  if (!*conf)
265  return 0;
268  *conf = 0;
269  return 0;
270  }
271  newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;
272  if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)
273  return ret;
275  av_strlcat(st->recommended_encoder_configuration, *conf, newsize);
276  av_freep(conf);
277  return 0;
278 }
279 
281 {
282  FFMContext *ffm = s->priv_data;
283  AVStream *st;
284  AVIOContext *pb = s->pb;
285  AVCodecContext *codec;
286  const AVCodecDescriptor *codec_desc;
287  int ret, i;
288  int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1;
289  AVCodec *enc;
290  char *buffer;
291 
292  ffm->packet_size = avio_rb32(pb);
293  if (ffm->packet_size != FFM_PACKET_SIZE) {
294  av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
296  ret = AVERROR_INVALIDDATA;
297  goto fail;
298  }
299 
300  ffm->write_index = avio_rb64(pb);
301  /* get also filesize */
302  if (pb->seekable) {
303  ffm->file_size = avio_size(pb);
304  if (ffm->write_index && 0)
306  } else {
307  ffm->file_size = (UINT64_C(1) << 63) - 1;
308  }
309 
310  while(!avio_feof(pb)) {
311  unsigned id = avio_rb32(pb);
312  unsigned size = avio_rb32(pb);
313  int64_t next = avio_tell(pb) + size;
314  char rc_eq_buf[128];
315 
316  if(!id)
317  break;
318 
319  switch(id) {
320  case MKBETAG('M', 'A', 'I', 'N'):
321  if (f_main++) {
322  ret = AVERROR(EINVAL);
323  goto fail;
324  }
325  avio_rb32(pb); /* nb_streams */
326  avio_rb32(pb); /* total bitrate */
327  break;
328  case MKBETAG('C', 'O', 'M', 'M'):
329  f_cprv = f_stvi = f_stau = 0;
330  st = avformat_new_stream(s, NULL);
331  if (!st) {
332  ret = AVERROR(ENOMEM);
333  goto fail;
334  }
335 
336  avpriv_set_pts_info(st, 64, 1, 1000000);
337 
338  codec = st->codec;
339  /* generic info */
340  codec->codec_id = avio_rb32(pb);
341  codec_desc = avcodec_descriptor_get(codec->codec_id);
342  if (!codec_desc) {
343  av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id);
344  codec->codec_id = AV_CODEC_ID_NONE;
345  goto fail;
346  }
347  codec->codec_type = avio_r8(pb);
348  if (codec->codec_type != codec_desc->type) {
349  av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",
350  codec_desc->type, codec->codec_type);
351  codec->codec_id = AV_CODEC_ID_NONE;
353  goto fail;
354  }
355  codec->bit_rate = avio_rb32(pb);
356  codec->flags = avio_rb32(pb);
357  codec->flags2 = avio_rb32(pb);
358  codec->debug = avio_rb32(pb);
359  if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
360  int size = avio_rb32(pb);
362  if (!codec->extradata)
363  return AVERROR(ENOMEM);
364  codec->extradata_size = size;
365  avio_read(pb, codec->extradata, size);
366  }
367  break;
368  case MKBETAG('S', 'T', 'V', 'I'):
369  if (f_stvi++) {
370  ret = AVERROR(EINVAL);
371  goto fail;
372  }
373  codec->time_base.num = avio_rb32(pb);
374  codec->time_base.den = avio_rb32(pb);
375  if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {
376  av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",
377  codec->time_base.num, codec->time_base.den);
378  ret = AVERROR_INVALIDDATA;
379  goto fail;
380  }
381  codec->width = avio_rb16(pb);
382  codec->height = avio_rb16(pb);
383  codec->gop_size = avio_rb16(pb);
384  codec->pix_fmt = avio_rb32(pb);
385  if (!av_pix_fmt_desc_get(codec->pix_fmt)) {
386  av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codec->pix_fmt);
387  codec->pix_fmt = AV_PIX_FMT_NONE;
388  goto fail;
389  }
390  codec->qmin = avio_r8(pb);
391  codec->qmax = avio_r8(pb);
392  codec->max_qdiff = avio_r8(pb);
393  codec->qcompress = avio_rb16(pb) / 10000.0;
394  codec->qblur = avio_rb16(pb) / 10000.0;
395  codec->bit_rate_tolerance = avio_rb32(pb);
396  avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
397  codec->rc_eq = av_strdup(rc_eq_buf);
398  codec->rc_max_rate = avio_rb32(pb);
399  codec->rc_min_rate = avio_rb32(pb);
400  codec->rc_buffer_size = avio_rb32(pb);
401  codec->i_quant_factor = av_int2double(avio_rb64(pb));
402  codec->b_quant_factor = av_int2double(avio_rb64(pb));
403  codec->i_quant_offset = av_int2double(avio_rb64(pb));
404  codec->b_quant_offset = av_int2double(avio_rb64(pb));
405  codec->dct_algo = avio_rb32(pb);
406  codec->strict_std_compliance = avio_rb32(pb);
407  codec->max_b_frames = avio_rb32(pb);
408  codec->mpeg_quant = avio_rb32(pb);
409  codec->intra_dc_precision = avio_rb32(pb);
410  codec->me_method = avio_rb32(pb);
411  codec->mb_decision = avio_rb32(pb);
412  codec->nsse_weight = avio_rb32(pb);
413  codec->frame_skip_cmp = avio_rb32(pb);
415  codec->codec_tag = avio_rb32(pb);
416  codec->thread_count = avio_r8(pb);
417  codec->coder_type = avio_rb32(pb);
418  codec->me_cmp = avio_rb32(pb);
419  codec->me_subpel_quality = avio_rb32(pb);
420  codec->me_range = avio_rb32(pb);
421  codec->keyint_min = avio_rb32(pb);
422  codec->scenechange_threshold = avio_rb32(pb);
423  codec->b_frame_strategy = avio_rb32(pb);
424  codec->qcompress = av_int2double(avio_rb64(pb));
425  codec->qblur = av_int2double(avio_rb64(pb));
426  codec->max_qdiff = avio_rb32(pb);
427  codec->refs = avio_rb32(pb);
428  break;
429  case MKBETAG('S', 'T', 'A', 'U'):
430  if (f_stau++) {
431  ret = AVERROR(EINVAL);
432  goto fail;
433  }
434  codec->sample_rate = avio_rb32(pb);
435  codec->channels = avio_rl16(pb);
436  codec->frame_size = avio_rl16(pb);
437  break;
438  case MKBETAG('C', 'P', 'R', 'V'):
439  if (f_cprv++) {
440  ret = AVERROR(EINVAL);
441  goto fail;
442  }
443  enc = avcodec_find_encoder(codec->codec_id);
444  if (enc && enc->priv_data_size && enc->priv_class) {
445  buffer = av_malloc(size + 1);
446  if (!buffer) {
447  ret = AVERROR(ENOMEM);
448  goto fail;
449  }
450  avio_get_str(pb, size, buffer, size + 1);
451  if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
452  goto fail;
453  }
454  break;
455  case MKBETAG('S', '2', 'V', 'I'):
456  if (f_stvi++ || !size) {
457  ret = AVERROR(EINVAL);
458  goto fail;
459  }
460  buffer = av_malloc(size);
461  if (!buffer) {
462  ret = AVERROR(ENOMEM);
463  goto fail;
464  }
465  avio_get_str(pb, INT_MAX, buffer, size);
466  av_set_options_string(codec, buffer, "=", ",");
467  if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
468  goto fail;
469  break;
470  case MKBETAG('S', '2', 'A', 'U'):
471  if (f_stau++ || !size) {
472  ret = AVERROR(EINVAL);
473  goto fail;
474  }
475  buffer = av_malloc(size);
476  if (!buffer) {
477  ret = AVERROR(ENOMEM);
478  goto fail;
479  }
480  avio_get_str(pb, INT_MAX, buffer, size);
481  av_set_options_string(codec, buffer, "=", ",");
482  if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
483  goto fail;
484  break;
485  }
486  avio_seek(pb, next, SEEK_SET);
487  }
488 
489  for (i = 0; i < s->nb_streams; i++)
491 
492  /* get until end of block reached */
493  while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
494  avio_r8(pb);
495 
496  /* init packet demux */
497  ffm->packet_ptr = ffm->packet;
498  ffm->packet_end = ffm->packet;
499  ffm->frame_offset = 0;
500  ffm->dts = 0;
501  ffm->read_state = READ_HEADER;
502  ffm->first_packet = 1;
503  return 0;
504  fail:
505  ffm_close(s);
506  return ret;
507 }
508 
510 {
511  FFMContext *ffm = s->priv_data;
512  AVStream *st;
513  AVIOContext *pb = s->pb;
514  AVCodecContext *codec;
515  const AVCodecDescriptor *codec_desc;
516  int i, nb_streams;
517  uint32_t tag;
518 
519  /* header */
520  tag = avio_rl32(pb);
521  if (tag == MKTAG('F', 'F', 'M', '2'))
522  return ffm2_read_header(s);
523  if (tag != MKTAG('F', 'F', 'M', '1'))
524  goto fail;
525  ffm->packet_size = avio_rb32(pb);
526  if (ffm->packet_size != FFM_PACKET_SIZE)
527  goto fail;
528  ffm->write_index = avio_rb64(pb);
529  /* get also filesize */
530  if (pb->seekable) {
531  ffm->file_size = avio_size(pb);
532  if (ffm->write_index && 0)
534  } else {
535  ffm->file_size = (UINT64_C(1) << 63) - 1;
536  }
537 
538  nb_streams = avio_rb32(pb);
539  avio_rb32(pb); /* total bitrate */
540  /* read each stream */
541  for(i=0;i<nb_streams;i++) {
542  char rc_eq_buf[128];
543 
544  st = avformat_new_stream(s, NULL);
545  if (!st)
546  goto fail;
547 
548  avpriv_set_pts_info(st, 64, 1, 1000000);
549 
550  codec = st->codec;
551  /* generic info */
552  codec->codec_id = avio_rb32(pb);
553  codec_desc = avcodec_descriptor_get(codec->codec_id);
554  if (!codec_desc) {
555  av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id);
556  codec->codec_id = AV_CODEC_ID_NONE;
557  goto fail;
558  }
559  codec->codec_type = avio_r8(pb); /* codec_type */
560  if (codec->codec_type != codec_desc->type) {
561  av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",
562  codec_desc->type, codec->codec_type);
563  codec->codec_id = AV_CODEC_ID_NONE;
565  goto fail;
566  }
567  codec->bit_rate = avio_rb32(pb);
568  codec->flags = avio_rb32(pb);
569  codec->flags2 = avio_rb32(pb);
570  codec->debug = avio_rb32(pb);
571  /* specific info */
572  switch(codec->codec_type) {
573  case AVMEDIA_TYPE_VIDEO:
574  codec->time_base.num = avio_rb32(pb);
575  codec->time_base.den = avio_rb32(pb);
576  if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {
577  av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",
578  codec->time_base.num, codec->time_base.den);
579  goto fail;
580  }
581  codec->width = avio_rb16(pb);
582  codec->height = avio_rb16(pb);
583  codec->gop_size = avio_rb16(pb);
584  codec->pix_fmt = avio_rb32(pb);
585  if (!av_pix_fmt_desc_get(codec->pix_fmt)) {
586  av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codec->pix_fmt);
587  codec->pix_fmt = AV_PIX_FMT_NONE;
588  goto fail;
589  }
590  codec->qmin = avio_r8(pb);
591  codec->qmax = avio_r8(pb);
592  codec->max_qdiff = avio_r8(pb);
593  codec->qcompress = avio_rb16(pb) / 10000.0;
594  codec->qblur = avio_rb16(pb) / 10000.0;
595  codec->bit_rate_tolerance = avio_rb32(pb);
596  avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
597  codec->rc_eq = av_strdup(rc_eq_buf);
598  codec->rc_max_rate = avio_rb32(pb);
599  codec->rc_min_rate = avio_rb32(pb);
600  codec->rc_buffer_size = avio_rb32(pb);
601  codec->i_quant_factor = av_int2double(avio_rb64(pb));
602  codec->b_quant_factor = av_int2double(avio_rb64(pb));
603  codec->i_quant_offset = av_int2double(avio_rb64(pb));
604  codec->b_quant_offset = av_int2double(avio_rb64(pb));
605  codec->dct_algo = avio_rb32(pb);
606  codec->strict_std_compliance = avio_rb32(pb);
607  codec->max_b_frames = avio_rb32(pb);
608  codec->mpeg_quant = avio_rb32(pb);
609  codec->intra_dc_precision = avio_rb32(pb);
610  codec->me_method = avio_rb32(pb);
611  codec->mb_decision = avio_rb32(pb);
612  codec->nsse_weight = avio_rb32(pb);
613  codec->frame_skip_cmp = avio_rb32(pb);
615  codec->codec_tag = avio_rb32(pb);
616  codec->thread_count = avio_r8(pb);
617  codec->coder_type = avio_rb32(pb);
618  codec->me_cmp = avio_rb32(pb);
619  codec->me_subpel_quality = avio_rb32(pb);
620  codec->me_range = avio_rb32(pb);
621  codec->keyint_min = avio_rb32(pb);
622  codec->scenechange_threshold = avio_rb32(pb);
623  codec->b_frame_strategy = avio_rb32(pb);
624  codec->qcompress = av_int2double(avio_rb64(pb));
625  codec->qblur = av_int2double(avio_rb64(pb));
626  codec->max_qdiff = avio_rb32(pb);
627  codec->refs = avio_rb32(pb);
628  break;
629  case AVMEDIA_TYPE_AUDIO:
630  codec->sample_rate = avio_rb32(pb);
631  codec->channels = avio_rl16(pb);
632  codec->frame_size = avio_rl16(pb);
633  break;
634  default:
635  goto fail;
636  }
637  if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
638  int size = avio_rb32(pb);
640  if (!codec->extradata)
641  return AVERROR(ENOMEM);
642  codec->extradata_size = size;
643  avio_read(pb, codec->extradata, size);
644  }
645 
647  }
648 
649  /* get until end of block reached */
650  while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
651  avio_r8(pb);
652 
653  /* init packet demux */
654  ffm->packet_ptr = ffm->packet;
655  ffm->packet_end = ffm->packet;
656  ffm->frame_offset = 0;
657  ffm->dts = 0;
658  ffm->read_state = READ_HEADER;
659  ffm->first_packet = 1;
660  return 0;
661  fail:
662  ffm_close(s);
663  return -1;
664 }
665 
666 /* return < 0 if eof */
668 {
669  int size;
670  FFMContext *ffm = s->priv_data;
671  int duration, ret;
672 
673  switch(ffm->read_state) {
674  case READ_HEADER:
675  if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
676  return ret;
677 
678  ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
679  avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
680  if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
682  return -1;
683  if (ffm->header[1] & FLAG_DTS)
684  if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
685  return -1;
686  ffm->read_state = READ_DATA;
687  /* fall through */
688  case READ_DATA:
689  size = AV_RB24(ffm->header + 2);
690  if ((ret = ffm_is_avail_data(s, size)) < 0)
691  return ret;
692 
693  duration = AV_RB24(ffm->header + 5);
694 
695  if (av_new_packet(pkt, size) < 0) {
696  return AVERROR(ENOMEM);
697  }
698  pkt->stream_index = ffm->header[0];
699  if ((unsigned)pkt->stream_index >= s->nb_streams) {
700  av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
701  av_packet_unref(pkt);
702  ffm->read_state = READ_HEADER;
703  return -1;
704  }
705  pkt->pos = avio_tell(s->pb);
706  if (ffm->header[1] & FLAG_KEY_FRAME)
707  pkt->flags |= AV_PKT_FLAG_KEY;
708 
709  ffm->read_state = READ_HEADER;
710  if (ffm_read_data(s, pkt->data, size, 0) != size) {
711  /* bad case: desynchronized packet. we cancel all the packet loading */
712  av_packet_unref(pkt);
713  return -1;
714  }
715  pkt->pts = AV_RB64(ffm->header+8);
716  if (ffm->header[1] & FLAG_DTS)
717  pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
718  else
719  pkt->dts = pkt->pts;
720  pkt->duration = duration;
721  break;
722  }
723  return 0;
724 }
725 
726 /* seek to a given time in the file. The file read pointer is
727  positioned at or before pts. XXX: the following code is quite
728  approximative */
729 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
730 {
731  FFMContext *ffm = s->priv_data;
732  int64_t pos_min, pos_max, pos;
733  int64_t pts_min, pts_max, pts;
734  double pos1;
735 
736  ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
737  /* find the position using linear interpolation (better than
738  dichotomy in typical cases) */
739  if (ffm->write_index && ffm->write_index < ffm->file_size) {
740  if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
741  pos_min = FFM_PACKET_SIZE;
742  pos_max = ffm->write_index - FFM_PACKET_SIZE;
743  } else {
744  pos_min = ffm->write_index;
745  pos_max = ffm->file_size - FFM_PACKET_SIZE;
746  }
747  } else {
748  pos_min = FFM_PACKET_SIZE;
749  pos_max = ffm->file_size - FFM_PACKET_SIZE;
750  }
751  while (pos_min <= pos_max) {
752  pts_min = get_dts(s, pos_min);
753  pts_max = get_dts(s, pos_max);
754  if (pts_min > wanted_pts || pts_max <= wanted_pts) {
755  pos = pts_min > wanted_pts ? pos_min : pos_max;
756  goto found;
757  }
758  /* linear interpolation */
759  pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
760  (double)(pts_max - pts_min);
761  pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
762  if (pos <= pos_min)
763  pos = pos_min;
764  else if (pos >= pos_max)
765  pos = pos_max;
766  pts = get_dts(s, pos);
767  /* check if we are lucky */
768  if (pts == wanted_pts) {
769  goto found;
770  } else if (pts > wanted_pts) {
771  pos_max = pos - FFM_PACKET_SIZE;
772  } else {
773  pos_min = pos + FFM_PACKET_SIZE;
774  }
775  }
776  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
777 
778  found:
779  if (ffm_seek1(s, pos) < 0)
780  return -1;
781 
782  /* reset read state */
783  ffm->read_state = READ_HEADER;
784  ffm->packet_ptr = ffm->packet;
785  ffm->packet_end = ffm->packet;
786  ffm->first_packet = 1;
787 
788  return 0;
789 }
790 
791 static int ffm_probe(AVProbeData *p)
792 {
793  if (
794  p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
795  (p->buf[3] == '1' || p->buf[3] == '2'))
796  return AVPROBE_SCORE_MAX + 1;
797  return 0;
798 }
799 
800 static const AVOption options[] = {
801  {"server_attached", NULL, offsetof(FFMContext, server_attached), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },
802  {"ffm_write_index", NULL, offsetof(FFMContext, write_index), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },
803  {"ffm_file_size", NULL, offsetof(FFMContext, file_size), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },
804  { NULL },
805 };
806 
807 static const AVClass ffm_class = {
808  .class_name = "ffm demuxer",
809  .item_name = av_default_item_name,
810  .option = options,
811  .version = LIBAVUTIL_VERSION_INT,
812 };
814  .name = "ffm",
815  .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
816  .priv_data_size = sizeof(FFMContext),
821  .read_seek = ffm_seek,
822  .priv_class = &ffm_class,
823 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2360
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define PACKET_ID
Definition: ffm.h:32
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:292
int64_t dts
Definition: ffm.h:55
static const AVOption options[]
Definition: ffmdec.c:800
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2193
char * recommended_encoder_configuration
String containing paris of key and values describing recommended encoder configuration.
Definition: avformat.h:1213
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: utils.c:3034
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:2984
AVOption.
Definition: opt.h:245
#define AV_OPT_FLAG_EXPORT
The option is inteded for exporting values to the caller.
Definition: opt.h:286
enum AVCodecID id
Definition: mxfenc.c:104
int frame_offset
Definition: ffm.h:54
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2574
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1704
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1594
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:4399
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:1925
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
attribute_deprecated int frame_skip_cmp
Definition: avcodec.h:2729
int num
numerator
Definition: rational.h:44
int av_set_options_string(void *ctx, const char *opts, const char *key_val_sep, const char *pairs_sep)
Parse the key/value pairs list in opts.
Definition: opt.c:1378
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:213
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1867
static int ffm_append_recommended_configuration(AVStream *st, char **conf)
Definition: ffmdec.c:259
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:287
static AVPacket pkt
#define FLAG_DTS
Definition: ffm.h:37
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:688
static int ffm_resync(AVFormatContext *s, uint32_t state)
Definition: ffmdec.c:72
AVCodec.
Definition: avcodec.h:3531
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ffmdec.c:667
static int ffm_read_data(AVFormatContext *s, uint8_t *buf, int size, int header)
Definition: ffmdec.c:86
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1983
attribute_deprecated int me_method
This option does nothing.
Definition: avcodec.h:1874
#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:1776
Format I/O context.
Definition: avformat.h:1319
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int64_t file_size
Definition: ffm.h:47
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1712
attribute_deprecated float rc_buffer_aggressivity
Definition: avcodec.h:2652
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
attribute_deprecated const char * rc_eq
Definition: avcodec.h:2630
uint8_t
static int nb_streams
Definition: ffprobe.c:253
#define av_malloc(s)
static int64_t get_dts(AVFormatContext *s, int64_t pos)
Definition: ffmdec.c:183
AVOptions.
#define FRAME_HEADER_SIZE
Definition: cpia.c:30
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:703
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1592
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:1934
uint8_t * packet_end
Definition: ffm.h:56
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1754
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4037
int me_cmp
motion estimation comparison function
Definition: avcodec.h:2057
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1387
static int ffm_is_avail_data(AVFormatContext *s, int size)
Definition: ffmdec.c:36
uint8_t * data
Definition: avcodec.h:1574
uint32_t tag
Definition: movenc.c:1353
#define ff_dlog(a,...)
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
ptrdiff_t size
Definition: opengl_enc.c:101
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:770
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:447
static const uint8_t header[24]
Definition: sdr2.c:67
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:550
static int ffm2_read_header(AVFormatContext *s)
Definition: ffmdec.c:280
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1606
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
uint8_t * packet_ptr
Definition: ffm.h:56
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static void adjust_write_index(AVFormatContext *s)
Definition: ffmdec.c:195
av_default_item_name
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:672
#define AVERROR(e)
Definition: error.h:43
int ffio_set_buf_size(AVIOContext *s, int buf_size)
Definition: aviobuf.c:905
int qmax
maximum quantizer
Definition: avcodec.h:2588
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
static const AVClass ffm_class
Definition: ffmdec.c:807
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1734
simple assert() macros that are a bit more flexible than ISO C assert().
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:1976
static int ffm_probe(AVProbeData *p)
Definition: ffmdec.c:791
#define FFMAX(a, b)
Definition: common.h:94
#define fail()
Definition: checkasm.h:81
int first_packet
Definition: ffm.h:52
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1580
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:2914
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:541
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2615
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:2249
Definition: ffm.h:41
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:2645
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1375
int server_attached
Definition: ffm.h:59
int refs
number of reference frames
Definition: avcodec.h:2319
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:207
#define FFMIN(a, b)
Definition: common.h:96
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1826
int priv_data_size
Definition: avcodec.h:3567
int64_t duration
Definition: movenc-test.c:63
uint8_t header[FRAME_HEADER_SIZE+4]
Definition: ffm.h:49
int mb_decision
macroblock decision mode
Definition: avcodec.h:2201
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:192
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2595
int packet_size
Definition: ffm.h:53
int buffer_size
Maximum buffer size.
Definition: avio.h:173
attribute_deprecated int coder_type
Definition: avcodec.h:2691
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:3069
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2420
static int ffm_close(AVFormatContext *s)
Definition: ffmdec.c:249
enum AVMediaType codec_type
Definition: avcodec.h:1647
attribute_deprecated int mpeg_quant
Definition: avcodec.h:1966
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
attribute_deprecated int scenechange_threshold
Definition: avcodec.h:2223
enum AVCodecID codec_id
Definition: avcodec.h:1656
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:267
int sample_rate
samples per second
Definition: avcodec.h:2400
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
attribute_deprecated int b_frame_strategy
Definition: avcodec.h:1945
int debug
debug
Definition: avcodec.h:2878
Definition: ffm.h:44
main external API structure.
Definition: avcodec.h:1639
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:549
int qmin
minimum quantizer
Definition: avcodec.h:2581
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1671
static int write_index(NUTContext *nut, AVIOContext *bc)
Definition: nutenc.c:588
static struct @211 state
void * buf
Definition: avisynth_c.h:553
int extradata_size
Definition: avcodec.h:1755
Describe the class of an AVClass context structure.
Definition: log.h:67
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
Definition: utils.c:4063
static int ffm_read_header(AVFormatContext *s)
Definition: ffmdec.c:509
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1953
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2573
size_t av_strlcat(char *dst, const char *src, size_t size)
Append the string src to the string dst, but to a total length of no more than size - 1 bytes...
Definition: avstring.c:93
This struct describes the properties of a single codec described by an AVCodecID. ...
Definition: avcodec.h:651
static int64_t pts
Global timestamp for the audio frames.
static int flags
Definition: cpu.c:47
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3557
#define AV_CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
Definition: avcodec.h:873
AVInputFormat ff_ffm_demuxer
Definition: ffmdec.c:813
static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
Definition: ffmdec.c:171
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1852
enum AVMediaType type
Definition: avcodec.h:653
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:656
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:87
Main libavformat public API header.
uint8_t packet[FFM_PACKET_SIZE]
Definition: ffm.h:57
int nsse_weight
noise vs.
Definition: avcodec.h:3136
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:187
int64_t pos
position in the file of the current buffer
Definition: avio.h:184
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
Definition: ffmdec.c:729
int den
denominator
Definition: rational.h:45
#define MKBETAG(a, b, c, d)
Definition: common.h:343
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:725
int eof_reached
true if eof reached
Definition: avio.h:186
int len
int channels
number of audio channels
Definition: avcodec.h:2401
void * priv_data
Format private data.
Definition: avformat.h:1347
int read_state
Definition: ffm.h:48
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1741
int64_t write_index
Definition: ffm.h:47
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1573
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:728
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:311
int stream_index
Definition: avcodec.h:1576
#define MKTAG(a, b, c, d)
Definition: common.h:342
This structure stores compressed data.
Definition: avcodec.h:1551
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:2132
#define FLAG_KEY_FRAME
Definition: ffm.h:36
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
int strict_std_compliance
strictly follow the standard (MPEG4, ...).
Definition: avcodec.h:2856
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1567
GLuint buffer
Definition: opengl_enc.c:102
#define FFM_PACKET_SIZE
Definition: ffm.h:31
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:2638
int keyint_min
minimum GOP size
Definition: avcodec.h:2312