FFmpeg
swfenc.c
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1 /*
2  * Flash Compatible Streaming Format muxer
3  * Copyright (c) 2000 Fabrice Bellard
4  * Copyright (c) 2003 Tinic Uro
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config_components.h"
24 
25 #include "libavcodec/put_bits.h"
26 #include "libavutil/avassert.h"
27 #include "libavutil/fifo.h"
28 #include "avformat.h"
29 #include "flv.h"
30 #include "mux.h"
31 #include "swf.h"
32 
33 #define AUDIO_FIFO_SIZE 65536
34 
35 typedef struct SWFEncContext {
36  int64_t duration_pos;
37  int64_t tag_pos;
38  int64_t vframes_pos;
39  int samples_per_frame;
40  int sound_samples;
41  int swf_frame_number;
42  int video_frame_number;
43  int tag;
44  AVFifo *audio_fifo;
45  AVCodecParameters *audio_par, *video_par;
46  AVStream *video_st;
47 } SWFEncContext;
48 
49 static void put_swf_tag(AVFormatContext *s, int tag)
50 {
51  SWFEncContext *swf = s->priv_data;
52  AVIOContext *pb = s->pb;
53 
54  swf->tag_pos = avio_tell(pb);
55  swf->tag = tag;
56  /* reserve some room for the tag */
57  if (tag & TAG_LONG) {
58  avio_wl16(pb, 0);
59  avio_wl32(pb, 0);
60  } else {
61  avio_wl16(pb, 0);
62  }
63 }
64 
65 static void put_swf_end_tag(AVFormatContext *s)
66 {
67  SWFEncContext *swf = s->priv_data;
68  AVIOContext *pb = s->pb;
69  int64_t pos;
70  int tag_len, tag;
71 
72  pos = avio_tell(pb);
73  tag_len = pos - swf->tag_pos - 2;
74  tag = swf->tag;
75  avio_seek(pb, swf->tag_pos, SEEK_SET);
76  if (tag & TAG_LONG) {
77  tag &= ~TAG_LONG;
78  avio_wl16(pb, (tag << 6) | 0x3f);
79  avio_wl32(pb, tag_len - 4);
80  } else {
81  av_assert0(tag_len < 0x3f);
82  avio_wl16(pb, (tag << 6) | tag_len);
83  }
84  avio_seek(pb, pos, SEEK_SET);
85 }
86 
87 static inline void max_nbits(int *nbits_ptr, int val)
88 {
89  int n;
90 
91  if (val == 0)
92  return;
93  val = FFABS(val);
94  n = 1;
95  while (val != 0) {
96  n++;
97  val >>= 1;
98  }
99  if (n > *nbits_ptr)
100  *nbits_ptr = n;
101 }
102 
103 static void put_swf_rect(AVIOContext *pb,
104  int xmin, int xmax, int ymin, int ymax)
105 {
106  PutBitContext p;
107  uint8_t buf[256];
108  int nbits, mask;
109 
110  init_put_bits(&p, buf, sizeof(buf));
111 
112  nbits = 0;
113  max_nbits(&nbits, xmin);
114  max_nbits(&nbits, xmax);
115  max_nbits(&nbits, ymin);
116  max_nbits(&nbits, ymax);
117  mask = (1 << nbits) - 1;
118 
119  /* rectangle info */
120  put_bits(&p, 5, nbits);
121  put_bits(&p, nbits, xmin & mask);
122  put_bits(&p, nbits, xmax & mask);
123  put_bits(&p, nbits, ymin & mask);
124  put_bits(&p, nbits, ymax & mask);
125 
126  flush_put_bits(&p);
127  avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
128 }
129 
130 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
131 {
132  int nbits, mask;
133 
134  put_bits(pb, 1, 1); /* edge */
135  put_bits(pb, 1, 1); /* line select */
136  nbits = 2;
137  max_nbits(&nbits, dx);
138  max_nbits(&nbits, dy);
139 
140  mask = (1 << nbits) - 1;
141  put_bits(pb, 4, nbits - 2); /* 16 bits precision */
142  if (dx == 0) {
143  put_bits(pb, 1, 0);
144  put_bits(pb, 1, 1);
145  put_bits(pb, nbits, dy & mask);
146  } else if (dy == 0) {
147  put_bits(pb, 1, 0);
148  put_bits(pb, 1, 0);
149  put_bits(pb, nbits, dx & mask);
150  } else {
151  put_bits(pb, 1, 1);
152  put_bits(pb, nbits, dx & mask);
153  put_bits(pb, nbits, dy & mask);
154  }
155 }
156 
157 #define FRAC_BITS 16
158 
159 static void put_swf_matrix(AVIOContext *pb,
160  int a, int b, int c, int d, int tx, int ty)
161 {
162  PutBitContext p;
163  uint8_t buf[256];
164  int nbits;
165 
166  init_put_bits(&p, buf, sizeof(buf));
167 
168  put_bits(&p, 1, 1); /* a, d present */
169  nbits = 1;
170  max_nbits(&nbits, a);
171  max_nbits(&nbits, d);
172  put_bits(&p, 5, nbits); /* nb bits */
173  put_bits(&p, nbits, a);
174  put_bits(&p, nbits, d);
175 
176  put_bits(&p, 1, 1); /* b, c present */
177  nbits = 1;
178  max_nbits(&nbits, c);
179  max_nbits(&nbits, b);
180  put_bits(&p, 5, nbits); /* nb bits */
181  put_bits(&p, nbits, c);
182  put_bits(&p, nbits, b);
183 
184  nbits = 1;
185  max_nbits(&nbits, tx);
186  max_nbits(&nbits, ty);
187  put_bits(&p, 5, nbits); /* nb bits */
188  put_bits(&p, nbits, tx);
189  put_bits(&p, nbits, ty);
190 
191  flush_put_bits(&p);
192  avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
193 }
194 
195 static int swf_write_header(AVFormatContext *s)
196 {
197  SWFEncContext *swf = s->priv_data;
198  AVIOContext *pb = s->pb;
199  PutBitContext p;
200  uint8_t buf1[256];
201  int i, width, height, rate, rate_base;
202  int version;
203 
204  swf->sound_samples = 0;
205  swf->swf_frame_number = 0;
206  swf->video_frame_number = 0;
207 
208  for(i=0;i<s->nb_streams;i++) {
209  AVCodecParameters *par = s->streams[i]->codecpar;
210  if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
211  if (par->codec_id == AV_CODEC_ID_MP3) {
212  swf->audio_par = par;
213  swf->audio_fifo = av_fifo_alloc2(AUDIO_FIFO_SIZE, 1, 0);
214  if (!swf->audio_fifo)
215  return AVERROR(ENOMEM);
216  } else {
217  av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
218  return -1;
219  }
220  } else {
221  if (ff_codec_get_tag(ff_swf_codec_tags, par->codec_id) ||
222  par->codec_id == AV_CODEC_ID_PNG ||
223  par->codec_id == AV_CODEC_ID_MJPEG) {
224  swf->video_st = s->streams[i];
225  swf->video_par = par;
226  } else {
227  av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV, Flash Screen Video, PNG and MJPEG\n");
228  return -1;
229  }
230  }
231  }
232 
233  if (!swf->video_par) {
234  /* currently, cannot work correctly if audio only */
235  width = 320;
236  height = 200;
237  rate = 10;
238  rate_base= 1;
239  } else {
240  width = swf->video_par->width;
241  height = swf->video_par->height;
242  // TODO: should be avg_frame_rate
243  rate = swf->video_st->time_base.den;
244  rate_base = swf->video_st->time_base.num;
245  }
246 
247  if (!swf->audio_par)
248  swf->samples_per_frame = (44100LL * rate_base) / rate;
249  else
250  swf->samples_per_frame = (swf->audio_par->sample_rate * rate_base) / rate;
251 
252  avio_write(pb, "FWS", 3);
253 
254  if (!strcmp("avm2", s->oformat->name))
255  version = 9;
256  else if (swf->video_par && (swf->video_par->codec_id == AV_CODEC_ID_VP6A ||
257  swf->video_par->codec_id == AV_CODEC_ID_VP6F ||
258  swf->video_par->codec_id == AV_CODEC_ID_PNG))
259  version = 8; /* version 8 and above support VP6 and PNG codec */
260  else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLASHSV)
261  version = 7; /* version 7 and above support Flash Screen Video codec */
262  else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLV1)
263  version = 6; /* version 6 and above support FLV1 codec */
264  else
265  version = 4; /* version 4 for mpeg audio support */
266  avio_w8(pb, version);
267 
268  avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
269  (will be patched if not streamed) */
270 
271  put_swf_rect(pb, 0, width * 20, 0, height * 20);
272  if ((rate * 256LL) / rate_base >= (1<<16)) {
273  av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
274  return AVERROR(EINVAL);
275  }
276  avio_wl16(pb, (rate * 256LL) / rate_base); /* frame rate */
277  swf->duration_pos = avio_tell(pb);
278  avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
279 
280  /* swf v8 and later files require a file attribute tag */
281  if (version >= 8) {
282  put_swf_tag(s, TAG_FILEATTRIBUTES);
283  avio_wl32(pb, (version >= 9) << 3); /* set ActionScript v3/AVM2 flag */
284  put_swf_end_tag(s);
285  }
286 
287  /* define a shape with the jpeg inside */
288  if (swf->video_par && (swf->video_par->codec_id == AV_CODEC_ID_MJPEG || swf->video_par->codec_id == AV_CODEC_ID_PNG)) {
289  put_swf_tag(s, TAG_DEFINESHAPE);
290 
291  avio_wl16(pb, SHAPE_ID); /* ID of shape */
292  /* bounding rectangle */
293  put_swf_rect(pb, 0, width, 0, height);
294  /* style info */
295  avio_w8(pb, 1); /* one fill style */
296  avio_w8(pb, 0x41); /* clipped bitmap fill */
297  avio_wl16(pb, BITMAP_ID); /* bitmap ID */
298  /* position of the bitmap */
299  put_swf_matrix(pb, 1 << FRAC_BITS, 0,
300  0, 1 << FRAC_BITS, 0, 0);
301  avio_w8(pb, 0); /* no line style */
302 
303  /* shape drawing */
304  init_put_bits(&p, buf1, sizeof(buf1));
305  put_bits(&p, 4, 1); /* one fill bit */
306  put_bits(&p, 4, 0); /* zero line bit */
307 
308  put_bits(&p, 1, 0); /* not an edge */
309  put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
310  put_bits(&p, 5, 1); /* nbits */
311  put_bits(&p, 1, 0); /* X */
312  put_bits(&p, 1, 0); /* Y */
313  put_bits(&p, 1, 1); /* set fill style 1 */
314 
315  /* draw the rectangle ! */
316  put_swf_line_edge(&p, width, 0);
317  put_swf_line_edge(&p, 0, height);
318  put_swf_line_edge(&p, -width, 0);
319  put_swf_line_edge(&p, 0, -height);
320 
321  /* end of shape */
322  put_bits(&p, 1, 0); /* not an edge */
323  put_bits(&p, 5, 0);
324 
325  flush_put_bits(&p);
326  avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
327 
328  put_swf_end_tag(s);
329  }
330 
331  if (swf->audio_par && swf->audio_par->codec_id == AV_CODEC_ID_MP3) {
332  int v = 0;
333 
334  /* start sound */
335  put_swf_tag(s, TAG_STREAMHEAD2);
336  switch(swf->audio_par->sample_rate) {
337  case 11025: v |= 1 << 2; break;
338  case 22050: v |= 2 << 2; break;
339  case 44100: v |= 3 << 2; break;
340  default:
341  /* not supported */
342  av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
343  return -1;
344  }
345  v |= 0x02; /* 16 bit playback */
346  if (swf->audio_par->ch_layout.nb_channels == 2)
347  v |= 0x01; /* stereo playback */
348  avio_w8(s->pb, v);
349  v |= 0x20; /* mp3 compressed */
350  avio_w8(s->pb, v);
351  avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
352  avio_wl16(s->pb, 0);
353 
354  put_swf_end_tag(s);
355  }
356 
357  return 0;
358 }
359 
360 static int fifo_avio_wrapper(void *opaque, void *buf, size_t *nb_elems)
361 {
362  avio_write(opaque, buf, *nb_elems);
363  return 0;
364 }
365 
366 static int swf_write_video(AVFormatContext *s,
367  AVCodecParameters *par, const uint8_t *buf, int size, unsigned pkt_flags)
368 {
369  SWFEncContext *swf = s->priv_data;
370  AVIOContext *pb = s->pb;
371  unsigned codec_tag = ff_codec_get_tag(ff_swf_codec_tags, par->codec_id);
372 
373  /* Flash Player limit */
374  if (swf->swf_frame_number == 16000)
375  av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
376 
377  if (codec_tag) {
378  if (swf->video_frame_number == 0) {
379  /* create a new video object */
380  put_swf_tag(s, TAG_VIDEOSTREAM);
381  avio_wl16(pb, VIDEO_ID);
382  swf->vframes_pos = avio_tell(pb);
383  avio_wl16(pb, 15000); /* hard flash player limit */
384  avio_wl16(pb, par->width);
385  avio_wl16(pb, par->height);
386  avio_w8(pb, 0);
387  avio_w8(pb, codec_tag);
388  put_swf_end_tag(s);
389 
390  /* place the video object for the first time */
391  put_swf_tag(s, TAG_PLACEOBJECT2);
392  avio_w8(pb, 0x36);
393  avio_wl16(pb, 1);
394  avio_wl16(pb, VIDEO_ID);
395  put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
396  avio_wl16(pb, swf->video_frame_number);
397  avio_write(pb, "video", 5);
398  avio_w8(pb, 0x00);
399  put_swf_end_tag(s);
400  } else {
401  /* mark the character for update */
402  put_swf_tag(s, TAG_PLACEOBJECT2);
403  avio_w8(pb, 0x11);
404  avio_wl16(pb, 1);
405  avio_wl16(pb, swf->video_frame_number);
406  put_swf_end_tag(s);
407  }
408 
409  /* set video frame data */
410  put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
411  avio_wl16(pb, VIDEO_ID);
412  avio_wl16(pb, swf->video_frame_number++);
413  if (par->codec_id == AV_CODEC_ID_FLASHSV) {
414  /* FrameType and CodecId is needed here even if it is not documented correctly in the SWF specs */
415  int flags = codec_tag | (pkt_flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER);
416  avio_w8(pb, flags);
417  }
418  avio_write(pb, buf, size);
419  put_swf_end_tag(s);
420  } else if (par->codec_id == AV_CODEC_ID_MJPEG || par->codec_id == AV_CODEC_ID_PNG) {
421  if (swf->swf_frame_number > 0) {
422  /* remove the shape */
423  put_swf_tag(s, TAG_REMOVEOBJECT);
424  avio_wl16(pb, SHAPE_ID); /* shape ID */
425  avio_wl16(pb, 1); /* depth */
426  put_swf_end_tag(s);
427 
428  /* free the bitmap */
429  put_swf_tag(s, TAG_FREECHARACTER);
430  avio_wl16(pb, BITMAP_ID);
431  put_swf_end_tag(s);
432  }
433 
434  put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
435 
436  avio_wl16(pb, BITMAP_ID); /* ID of the image */
437 
438  /* a dummy jpeg header seems to be required */
439  if (par->codec_id == AV_CODEC_ID_MJPEG)
440  avio_wb32(pb, 0xffd8ffd9);
441  /* write the jpeg/png image */
442  avio_write(pb, buf, size);
443 
444  put_swf_end_tag(s);
445 
446  /* draw the shape */
447 
448  put_swf_tag(s, TAG_PLACEOBJECT);
449  avio_wl16(pb, SHAPE_ID); /* shape ID */
450  avio_wl16(pb, 1); /* depth */
451  put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
452  put_swf_end_tag(s);
453  }
454 
455  swf->swf_frame_number++;
456 
457  /* streaming sound always should be placed just before showframe tags */
458  if (swf->audio_par && av_fifo_can_read(swf->audio_fifo)) {
459  size_t frame_size = av_fifo_can_read(swf->audio_fifo);
460  put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
461  avio_wl16(pb, swf->sound_samples);
462  avio_wl16(pb, 0); // seek samples
463  av_fifo_read_to_cb(swf->audio_fifo, fifo_avio_wrapper, pb, &frame_size);
464  put_swf_end_tag(s);
465 
466  /* update FIFO */
467  swf->sound_samples = 0;
468  }
469 
470  /* output the frame */
471  put_swf_tag(s, TAG_SHOWFRAME);
472  put_swf_end_tag(s);
473 
474  return 0;
475 }
476 
477 static int swf_write_audio(AVFormatContext *s, AVCodecParameters *par,
478  const uint8_t *buf, int size)
479 {
480  SWFEncContext *swf = s->priv_data;
481 
482  /* Flash Player limit */
483  if (swf->swf_frame_number == 16000)
484  av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
485 
486  if (av_fifo_can_write(swf->audio_fifo) < size) {
487  av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
488  return -1;
489  }
490 
491  av_fifo_write(swf->audio_fifo, buf, size);
492  swf->sound_samples += av_get_audio_frame_duration2(par, size);
493 
494  /* if audio only stream make sure we add swf frames */
495  if (!swf->video_par)
496  swf_write_video(s, par, 0, 0, 0);
497 
498  return 0;
499 }
500 
501 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
502 {
503  AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
504  if (par->codec_type == AVMEDIA_TYPE_AUDIO)
505  return swf_write_audio(s, par, pkt->data, pkt->size);
506  else
507  return swf_write_video(s, par, pkt->data, pkt->size, pkt->flags);
508 }
509 
510 static int swf_write_trailer(AVFormatContext *s)
511 {
512  SWFEncContext *swf = s->priv_data;
513  AVIOContext *pb = s->pb;
514  int file_size;
515 
516  put_swf_tag(s, TAG_END);
517  put_swf_end_tag(s);
518 
519  /* patch file size and number of frames if not streamed */
520  if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && swf->video_par) {
521  file_size = avio_tell(pb);
522  avio_seek(pb, 4, SEEK_SET);
523  avio_wl32(pb, file_size);
524  avio_seek(pb, swf->duration_pos, SEEK_SET);
525  avio_wl16(pb, swf->video_frame_number);
526  if (swf->vframes_pos) {
527  avio_seek(pb, swf->vframes_pos, SEEK_SET);
528  avio_wl16(pb, swf->video_frame_number);
529  }
530  avio_seek(pb, file_size, SEEK_SET);
531  }
532  return 0;
533 }
534 
535 static void swf_deinit(AVFormatContext *s)
536 {
537  SWFEncContext *swf = s->priv_data;
538 
539  av_fifo_freep2(&swf->audio_fifo);
540 }
541 
542 #if CONFIG_SWF_MUXER
543 const FFOutputFormat ff_swf_muxer = {
544  .p.name = "swf",
545  .p.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
546  .p.mime_type = "application/x-shockwave-flash",
547  .p.extensions = "swf",
548  .priv_data_size = sizeof(SWFEncContext),
549  .p.audio_codec = AV_CODEC_ID_MP3,
550  .p.video_codec = AV_CODEC_ID_FLV1,
551  .p.subtitle_codec = AV_CODEC_ID_NONE,
552  .write_header = swf_write_header,
553  .write_packet = swf_write_packet,
554  .write_trailer = swf_write_trailer,
555  .deinit = swf_deinit,
556  .p.flags = AVFMT_TS_NONSTRICT,
557  .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
558 };
559 #endif
560 #if CONFIG_AVM2_MUXER
561 const FFOutputFormat ff_avm2_muxer = {
562  .p.name = "avm2",
563  .p.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
564  .p.mime_type = "application/x-shockwave-flash",
565  .priv_data_size = sizeof(SWFEncContext),
566  .p.audio_codec = AV_CODEC_ID_MP3,
567  .p.video_codec = AV_CODEC_ID_FLV1,
568  .p.subtitle_codec = AV_CODEC_ID_NONE,
569  .write_header = swf_write_header,
570  .write_packet = swf_write_packet,
571  .write_trailer = swf_write_trailer,
572  .deinit = swf_deinit,
573  .p.flags = AVFMT_TS_NONSTRICT,
574  .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
575 };
576 #endif
AV_CODEC_ID_VP6F
@ AV_CODEC_ID_VP6F
Definition: codec_id.h:144
av_fifo_can_write
size_t av_fifo_can_write(const AVFifo *f)
Definition: fifo.c:94
SWFEncContext
Definition: swfenc.c:35
AVOutputFormat::name
const char * name
Definition: avformat.h:510
AVERROR
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
max_nbits
static void max_nbits(int *nbits_ptr, int val)
Definition: swfenc.c:87
TAG_REMOVEOBJECT
@ TAG_REMOVEOBJECT
Definition: swf.h:38
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
swf_write_header
static int swf_write_header(AVFormatContext *s)
Definition: swfenc.c:195
put_swf_end_tag
static void put_swf_end_tag(AVFormatContext *s)
Definition: swfenc.c:65
FLV_FRAME_KEY
@ FLV_FRAME_KEY
key frame (for AVC, a seekable frame)
Definition: flv.h:131
int64_t
long long int64_t
Definition: coverity.c:34
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
swf_write_audio
static int swf_write_audio(AVFormatContext *s, AVCodecParameters *par, const uint8_t *buf, int size)
Definition: swfenc.c:477
TAG_VIDEOFRAME
@ TAG_VIDEOFRAME
Definition: swf.h:75
DUMMY_FILE_SIZE
#define DUMMY_FILE_SIZE
Definition: swf.h:29
mask
int mask
Definition: mediacodecdec_common.c:154
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:223
AVPacket::data
uint8_t * data
Definition: packet.h:539
SWFEncContext::tag_pos
int64_t tag_pos
Definition: swfenc.c:37
AUDIO_FIFO_SIZE
#define AUDIO_FIFO_SIZE
Definition: swfenc.c:33
b
#define b
Definition: input.c:41
SWFEncContext::tag
int tag
Definition: swfenc.c:43
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:328
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:594
TAG_VIDEOSTREAM
@ TAG_VIDEOSTREAM
Definition: swf.h:74
swf_deinit
static void swf_deinit(AVFormatContext *s)
Definition: swfenc.c:535
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:65
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:437
fifo.h
av_fifo_write
int av_fifo_write(AVFifo *f, const void *buf, size_t nb_elems)
Write data into a FIFO.
Definition: fifo.c:188
SHAPE_ID
#define SHAPE_ID
Definition: swf.h:110
TAG_FILEATTRIBUTES
@ TAG_FILEATTRIBUTES
Definition: swf.h:80
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
val
static double val(void *priv, double ch)
Definition: aeval.c:77
SWFEncContext::video_st
AVStream * video_st
Definition: swfenc.c:46
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:448
AVRational::num
int num
Numerator.
Definition: rational.h:59
FLAG_SETFILL0
#define FLAG_SETFILL0
Definition: swf.h:104
avassert.h
put_swf_matrix
static void put_swf_matrix(AVIOContext *pb, int a, int b, int c, int d, int tx, int ty)
Definition: swfenc.c:159
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
swf.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
ff_swf_codec_tags
const AVCodecTag ff_swf_codec_tags[]
Definition: swf.c:25
ff_avm2_muxer
const FFOutputFormat ff_avm2_muxer
frame_size
int frame_size
Definition: mxfenc.c:2429
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
DUMMY_DURATION
#define DUMMY_DURATION
Definition: swf.h:30
swf_write_trailer
static int swf_write_trailer(AVFormatContext *s)
Definition: swfenc.c:510
PutBitContext
Definition: put_bits.h:50
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:74
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:113
AVFormatContext
Format I/O context.
Definition: avformat.h:1300
PutBitContext::buf
uint8_t * buf
Definition: put_bits.h:53
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:787
SWFEncContext::vframes_pos
int64_t vframes_pos
Definition: swfenc.c:38
SWFEncContext::swf_frame_number
int swf_frame_number
Definition: swfenc.c:41
TAG_STREAMHEAD2
@ TAG_STREAMHEAD2
Definition: swf.h:67
av_fifo_can_read
size_t av_fifo_can_read(const AVFifo *f)
Definition: fifo.c:87
FFOutputFormat
Definition: mux.h:61
flv.h
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:179
AV_CODEC_ID_FLASHSV
@ AV_CODEC_ID_FLASHSV
Definition: codec_id.h:138
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AV_CODEC_ID_VP6A
@ AV_CODEC_ID_VP6A
Definition: codec_id.h:158
TAG_STREAMBLOCK
@ TAG_STREAMBLOCK
Definition: swf.h:51
c
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
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
BITMAP_ID
#define BITMAP_ID
Definition: swf.h:108
TAG_PLACEOBJECT
@ TAG_PLACEOBJECT
Definition: swf.h:37
SWFEncContext::audio_fifo
AVFifo * audio_fifo
Definition: swfenc.c:44
FLAG_MOVETO
#define FLAG_MOVETO
Definition: swf.h:103
SWFEncContext::sound_samples
int sound_samples
Definition: swfenc.c:40
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
av_fifo_read_to_cb
int av_fifo_read_to_cb(AVFifo *f, AVFifoCB write_cb, void *opaque, size_t *nb_elems)
Feed data from a FIFO into a user-provided callback.
Definition: fifo.c:247
AVPacket::size
int size
Definition: packet.h:540
AVFifo
Definition: fifo.c:35
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
height
#define height
Definition: dsp.h:85
size
int size
Definition: twinvq_data.h:10344
av_get_audio_frame_duration2
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:805
TAG_LONG
#define TAG_LONG
Definition: swf.h:100
TAG_END
@ TAG_END
Definition: swf.h:33
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:201
avio_wb32
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:365
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:357
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:545
version
version
Definition: libkvazaar.c:321
TAG_SHOWFRAME
@ TAG_SHOWFRAME
Definition: swf.h:34
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:220
swf_write_video
static int swf_write_video(AVFormatContext *s, AVCodecParameters *par, const uint8_t *buf, int size, unsigned pkt_flags)
Definition: swfenc.c:366
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:59
SWFEncContext::samples_per_frame
int samples_per_frame
Definition: swfenc.c:39
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
ff_swf_muxer
const FFOutputFormat ff_swf_muxer
AVCodecParameters::height
int height
Definition: codec_par.h:135
FF_OFMT_FLAG_MAX_ONE_OF_EACH
#define FF_OFMT_FLAG_MAX_ONE_OF_EACH
If this flag is set, it indicates that for each codec type whose corresponding default codec (i....
Definition: mux.h:50
swf_write_packet
static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: swfenc.c:501
AVFMT_TS_NONSTRICT
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:491
SWFEncContext::audio_par
AVCodecParameters * audio_par
Definition: swfenc.c:45
tag
uint32_t tag
Definition: movenc.c:1879
SWFEncContext::video_par
AVCodecParameters * video_par
Definition: swfenc.c:45
put_swf_rect
static void put_swf_rect(AVIOContext *pb, int xmin, int xmax, int ymin, int ymax)
Definition: swfenc.c:103
AVStream
Stream structure.
Definition: avformat.h:748
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
TAG_FREECHARACTER
@ TAG_FREECHARACTER
Definition: swf.h:36
pos
unsigned int pos
Definition: spdifenc.c:414
avformat.h
av_fifo_alloc2
AVFifo * av_fifo_alloc2(size_t nb_elems, size_t elem_size, unsigned int flags)
Allocate and initialize an AVFifo with a given element size.
Definition: fifo.c:47
VIDEO_ID
#define VIDEO_ID
Definition: mpeg.h:42
put_bits_ptr
static uint8_t * put_bits_ptr(PutBitContext *s)
Return the pointer to the byte where the bitstream writer will put the next bit.
Definition: put_bits.h:377
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:41
AVRational::den
int den
Denominator.
Definition: rational.h:60
SWFEncContext::duration_pos
int64_t duration_pos
Definition: swfenc.c:36
FLV_FRAME_INTER
@ FLV_FRAME_INTER
inter frame (for AVC, a non-seekable frame)
Definition: flv.h:132
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:123
AVPacket::stream_index
int stream_index
Definition: packet.h:541
TAG_PLACEOBJECT2
@ TAG_PLACEOBJECT2
Definition: swf.h:57
fifo_avio_wrapper
static int fifo_avio_wrapper(void *opaque, void *buf, size_t *nb_elems)
Definition: swfenc.c:360
SWFEncContext::video_frame_number
int video_frame_number
Definition: swfenc.c:42
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:516
put_swf_line_edge
static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
Definition: swfenc.c:130
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:482
TAG_JPEG2
@ TAG_JPEG2
Definition: swf.h:53
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
av_fifo_freep2
void av_fifo_freep2(AVFifo **f)
Free an AVFifo and reset pointer to NULL.
Definition: fifo.c:286
TAG_DEFINESHAPE
@ TAG_DEFINESHAPE
Definition: swf.h:35
width
#define width
Definition: dsp.h:85
AV_CODEC_ID_FLV1
@ AV_CODEC_ID_FLV1
Definition: codec_id.h:73
put_bits.h
put_swf_tag
static void put_swf_tag(AVFormatContext *s, int tag)
Definition: swfenc.c:49
FRAC_BITS
#define FRAC_BITS
Definition: swfenc.c:157
mux.h
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