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 "libavcodec/put_bits.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/fifo.h"
26 #include "avformat.h"
27 #include "flv.h"
28 #include "swf.h"
29 
30 #define AUDIO_FIFO_SIZE 65536
31 
32 typedef struct SWFEncContext {
33  int64_t duration_pos;
34  int64_t tag_pos;
35  int64_t vframes_pos;
36  int samples_per_frame;
37  int sound_samples;
38  int swf_frame_number;
39  int video_frame_number;
40  int tag;
41  AVFifoBuffer *audio_fifo;
42  AVCodecParameters *audio_par, *video_par;
43  AVStream *video_st;
44 } SWFEncContext;
45 
46 static void put_swf_tag(AVFormatContext *s, int tag)
47 {
48  SWFEncContext *swf = s->priv_data;
49  AVIOContext *pb = s->pb;
50 
51  swf->tag_pos = avio_tell(pb);
52  swf->tag = tag;
53  /* reserve some room for the tag */
54  if (tag & TAG_LONG) {
55  avio_wl16(pb, 0);
56  avio_wl32(pb, 0);
57  } else {
58  avio_wl16(pb, 0);
59  }
60 }
61 
62 static void put_swf_end_tag(AVFormatContext *s)
63 {
64  SWFEncContext *swf = s->priv_data;
65  AVIOContext *pb = s->pb;
66  int64_t pos;
67  int tag_len, tag;
68 
69  pos = avio_tell(pb);
70  tag_len = pos - swf->tag_pos - 2;
71  tag = swf->tag;
72  avio_seek(pb, swf->tag_pos, SEEK_SET);
73  if (tag & TAG_LONG) {
74  tag &= ~TAG_LONG;
75  avio_wl16(pb, (tag << 6) | 0x3f);
76  avio_wl32(pb, tag_len - 4);
77  } else {
78  av_assert0(tag_len < 0x3f);
79  avio_wl16(pb, (tag << 6) | tag_len);
80  }
81  avio_seek(pb, pos, SEEK_SET);
82 }
83 
84 static inline void max_nbits(int *nbits_ptr, int val)
85 {
86  int n;
87 
88  if (val == 0)
89  return;
90  val = FFABS(val);
91  n = 1;
92  while (val != 0) {
93  n++;
94  val >>= 1;
95  }
96  if (n > *nbits_ptr)
97  *nbits_ptr = n;
98 }
99 
100 static void put_swf_rect(AVIOContext *pb,
101  int xmin, int xmax, int ymin, int ymax)
102 {
103  PutBitContext p;
104  uint8_t buf[256];
105  int nbits, mask;
106 
107  init_put_bits(&p, buf, sizeof(buf));
108 
109  nbits = 0;
110  max_nbits(&nbits, xmin);
111  max_nbits(&nbits, xmax);
112  max_nbits(&nbits, ymin);
113  max_nbits(&nbits, ymax);
114  mask = (1 << nbits) - 1;
115 
116  /* rectangle info */
117  put_bits(&p, 5, nbits);
118  put_bits(&p, nbits, xmin & mask);
119  put_bits(&p, nbits, xmax & mask);
120  put_bits(&p, nbits, ymin & mask);
121  put_bits(&p, nbits, ymax & mask);
122 
123  flush_put_bits(&p);
124  avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
125 }
126 
127 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
128 {
129  int nbits, mask;
130 
131  put_bits(pb, 1, 1); /* edge */
132  put_bits(pb, 1, 1); /* line select */
133  nbits = 2;
134  max_nbits(&nbits, dx);
135  max_nbits(&nbits, dy);
136 
137  mask = (1 << nbits) - 1;
138  put_bits(pb, 4, nbits - 2); /* 16 bits precision */
139  if (dx == 0) {
140  put_bits(pb, 1, 0);
141  put_bits(pb, 1, 1);
142  put_bits(pb, nbits, dy & mask);
143  } else if (dy == 0) {
144  put_bits(pb, 1, 0);
145  put_bits(pb, 1, 0);
146  put_bits(pb, nbits, dx & mask);
147  } else {
148  put_bits(pb, 1, 1);
149  put_bits(pb, nbits, dx & mask);
150  put_bits(pb, nbits, dy & mask);
151  }
152 }
153 
154 #define FRAC_BITS 16
155 
156 static void put_swf_matrix(AVIOContext *pb,
157  int a, int b, int c, int d, int tx, int ty)
158 {
159  PutBitContext p;
160  uint8_t buf[256];
161  int nbits;
162 
163  init_put_bits(&p, buf, sizeof(buf));
164 
165  put_bits(&p, 1, 1); /* a, d present */
166  nbits = 1;
167  max_nbits(&nbits, a);
168  max_nbits(&nbits, d);
169  put_bits(&p, 5, nbits); /* nb bits */
170  put_bits(&p, nbits, a);
171  put_bits(&p, nbits, d);
172 
173  put_bits(&p, 1, 1); /* b, c present */
174  nbits = 1;
175  max_nbits(&nbits, c);
176  max_nbits(&nbits, b);
177  put_bits(&p, 5, nbits); /* nb bits */
178  put_bits(&p, nbits, c);
179  put_bits(&p, nbits, b);
180 
181  nbits = 1;
182  max_nbits(&nbits, tx);
183  max_nbits(&nbits, ty);
184  put_bits(&p, 5, nbits); /* nb bits */
185  put_bits(&p, nbits, tx);
186  put_bits(&p, nbits, ty);
187 
188  flush_put_bits(&p);
189  avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
190 }
191 
192 static int swf_write_header(AVFormatContext *s)
193 {
194  SWFEncContext *swf = s->priv_data;
195  AVIOContext *pb = s->pb;
196  PutBitContext p;
197  uint8_t buf1[256];
198  int i, width, height, rate, rate_base;
199  int version;
200 
201  swf->sound_samples = 0;
202  swf->swf_frame_number = 0;
203  swf->video_frame_number = 0;
204 
205  for(i=0;i<s->nb_streams;i++) {
206  AVCodecParameters *par = s->streams[i]->codecpar;
207  if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
208  if (swf->audio_par) {
209  av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
210  return AVERROR_INVALIDDATA;
211  }
212  if (par->codec_id == AV_CODEC_ID_MP3) {
213  swf->audio_par = par;
214  swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
215  if (!swf->audio_fifo)
216  return AVERROR(ENOMEM);
217  } else {
218  av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
219  return -1;
220  }
221  } else {
222  if (swf->video_par) {
223  av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
224  return AVERROR_INVALIDDATA;
225  }
226  if (ff_codec_get_tag(ff_swf_codec_tags, par->codec_id) ||
227  par->codec_id == AV_CODEC_ID_PNG ||
228  par->codec_id == AV_CODEC_ID_MJPEG) {
229  swf->video_st = s->streams[i];
230  swf->video_par = par;
231  } else {
232  av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV, Flash Screen Video, PNG and MJPEG\n");
233  return -1;
234  }
235  }
236  }
237 
238  if (!swf->video_par) {
239  /* currently, cannot work correctly if audio only */
240  width = 320;
241  height = 200;
242  rate = 10;
243  rate_base= 1;
244  } else {
245  width = swf->video_par->width;
246  height = swf->video_par->height;
247  // TODO: should be avg_frame_rate
248  rate = swf->video_st->time_base.den;
249  rate_base = swf->video_st->time_base.num;
250  }
251 
252  if (!swf->audio_par)
253  swf->samples_per_frame = (44100LL * rate_base) / rate;
254  else
255  swf->samples_per_frame = (swf->audio_par->sample_rate * rate_base) / rate;
256 
257  avio_write(pb, "FWS", 3);
258 
259  if (!strcmp("avm2", s->oformat->name))
260  version = 9;
261  else if (swf->video_par && (swf->video_par->codec_id == AV_CODEC_ID_VP6A ||
262  swf->video_par->codec_id == AV_CODEC_ID_VP6F ||
263  swf->video_par->codec_id == AV_CODEC_ID_PNG))
264  version = 8; /* version 8 and above support VP6 and PNG codec */
265  else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLASHSV)
266  version = 7; /* version 7 and above support Flash Screen Video codec */
267  else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLV1)
268  version = 6; /* version 6 and above support FLV1 codec */
269  else
270  version = 4; /* version 4 for mpeg audio support */
271  avio_w8(pb, version);
272 
273  avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
274  (will be patched if not streamed) */
275 
276  put_swf_rect(pb, 0, width * 20, 0, height * 20);
277  if ((rate * 256LL) / rate_base >= (1<<16)) {
278  av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
279  return AVERROR(EINVAL);
280  }
281  avio_wl16(pb, (rate * 256LL) / rate_base); /* frame rate */
282  swf->duration_pos = avio_tell(pb);
283  avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
284 
285  /* swf v8 and later files require a file attribute tag */
286  if (version >= 8) {
287  put_swf_tag(s, TAG_FILEATTRIBUTES);
288  avio_wl32(pb, (version >= 9) << 3); /* set ActionScript v3/AVM2 flag */
289  put_swf_end_tag(s);
290  }
291 
292  /* define a shape with the jpeg inside */
293  if (swf->video_par && (swf->video_par->codec_id == AV_CODEC_ID_MJPEG || swf->video_par->codec_id == AV_CODEC_ID_PNG)) {
294  put_swf_tag(s, TAG_DEFINESHAPE);
295 
296  avio_wl16(pb, SHAPE_ID); /* ID of shape */
297  /* bounding rectangle */
298  put_swf_rect(pb, 0, width, 0, height);
299  /* style info */
300  avio_w8(pb, 1); /* one fill style */
301  avio_w8(pb, 0x41); /* clipped bitmap fill */
302  avio_wl16(pb, BITMAP_ID); /* bitmap ID */
303  /* position of the bitmap */
304  put_swf_matrix(pb, 1 << FRAC_BITS, 0,
305  0, 1 << FRAC_BITS, 0, 0);
306  avio_w8(pb, 0); /* no line style */
307 
308  /* shape drawing */
309  init_put_bits(&p, buf1, sizeof(buf1));
310  put_bits(&p, 4, 1); /* one fill bit */
311  put_bits(&p, 4, 0); /* zero line bit */
312 
313  put_bits(&p, 1, 0); /* not an edge */
314  put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
315  put_bits(&p, 5, 1); /* nbits */
316  put_bits(&p, 1, 0); /* X */
317  put_bits(&p, 1, 0); /* Y */
318  put_bits(&p, 1, 1); /* set fill style 1 */
319 
320  /* draw the rectangle ! */
321  put_swf_line_edge(&p, width, 0);
322  put_swf_line_edge(&p, 0, height);
323  put_swf_line_edge(&p, -width, 0);
324  put_swf_line_edge(&p, 0, -height);
325 
326  /* end of shape */
327  put_bits(&p, 1, 0); /* not an edge */
328  put_bits(&p, 5, 0);
329 
330  flush_put_bits(&p);
331  avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
332 
333  put_swf_end_tag(s);
334  }
335 
336  if (swf->audio_par && swf->audio_par->codec_id == AV_CODEC_ID_MP3) {
337  int v = 0;
338 
339  /* start sound */
340  put_swf_tag(s, TAG_STREAMHEAD2);
341  switch(swf->audio_par->sample_rate) {
342  case 11025: v |= 1 << 2; break;
343  case 22050: v |= 2 << 2; break;
344  case 44100: v |= 3 << 2; break;
345  default:
346  /* not supported */
347  av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
348  return -1;
349  }
350  v |= 0x02; /* 16 bit playback */
351  if (swf->audio_par->channels == 2)
352  v |= 0x01; /* stereo playback */
353  avio_w8(s->pb, v);
354  v |= 0x20; /* mp3 compressed */
355  avio_w8(s->pb, v);
356  avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
357  avio_wl16(s->pb, 0);
358 
359  put_swf_end_tag(s);
360  }
361 
362  return 0;
363 }
364 
365 static int swf_write_video(AVFormatContext *s,
366  AVCodecParameters *par, const uint8_t *buf, int size, unsigned pkt_flags)
367 {
368  SWFEncContext *swf = s->priv_data;
369  AVIOContext *pb = s->pb;
370  unsigned codec_tag = ff_codec_get_tag(ff_swf_codec_tags, par->codec_id);
371 
372  /* Flash Player limit */
373  if (swf->swf_frame_number == 16000)
374  av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
375 
376  if (codec_tag) {
377  if (swf->video_frame_number == 0) {
378  /* create a new video object */
379  put_swf_tag(s, TAG_VIDEOSTREAM);
380  avio_wl16(pb, VIDEO_ID);
381  swf->vframes_pos = avio_tell(pb);
382  avio_wl16(pb, 15000); /* hard flash player limit */
383  avio_wl16(pb, par->width);
384  avio_wl16(pb, par->height);
385  avio_w8(pb, 0);
386  avio_w8(pb, codec_tag);
387  put_swf_end_tag(s);
388 
389  /* place the video object for the first time */
390  put_swf_tag(s, TAG_PLACEOBJECT2);
391  avio_w8(pb, 0x36);
392  avio_wl16(pb, 1);
393  avio_wl16(pb, VIDEO_ID);
394  put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
395  avio_wl16(pb, swf->video_frame_number);
396  avio_write(pb, "video", 5);
397  avio_w8(pb, 0x00);
398  put_swf_end_tag(s);
399  } else {
400  /* mark the character for update */
401  put_swf_tag(s, TAG_PLACEOBJECT2);
402  avio_w8(pb, 0x11);
403  avio_wl16(pb, 1);
404  avio_wl16(pb, swf->video_frame_number);
405  put_swf_end_tag(s);
406  }
407 
408  /* set video frame data */
409  put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
410  avio_wl16(pb, VIDEO_ID);
411  avio_wl16(pb, swf->video_frame_number++);
412  if (par->codec_id == AV_CODEC_ID_FLASHSV) {
413  /* FrameType and CodecId is needed here even if it is not documented correctly in the SWF specs */
414  int flags = codec_tag | (pkt_flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER);
415  avio_w8(pb, flags);
416  }
417  avio_write(pb, buf, size);
418  put_swf_end_tag(s);
419  } else if (par->codec_id == AV_CODEC_ID_MJPEG || par->codec_id == AV_CODEC_ID_PNG) {
420  if (swf->swf_frame_number > 0) {
421  /* remove the shape */
422  put_swf_tag(s, TAG_REMOVEOBJECT);
423  avio_wl16(pb, SHAPE_ID); /* shape ID */
424  avio_wl16(pb, 1); /* depth */
425  put_swf_end_tag(s);
426 
427  /* free the bitmap */
428  put_swf_tag(s, TAG_FREECHARACTER);
429  avio_wl16(pb, BITMAP_ID);
430  put_swf_end_tag(s);
431  }
432 
433  put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
434 
435  avio_wl16(pb, BITMAP_ID); /* ID of the image */
436 
437  /* a dummy jpeg header seems to be required */
438  if (par->codec_id == AV_CODEC_ID_MJPEG)
439  avio_wb32(pb, 0xffd8ffd9);
440  /* write the jpeg/png image */
441  avio_write(pb, buf, size);
442 
443  put_swf_end_tag(s);
444 
445  /* draw the shape */
446 
447  put_swf_tag(s, TAG_PLACEOBJECT);
448  avio_wl16(pb, SHAPE_ID); /* shape ID */
449  avio_wl16(pb, 1); /* depth */
450  put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
451  put_swf_end_tag(s);
452  }
453 
454  swf->swf_frame_number++;
455 
456  /* streaming sound always should be placed just before showframe tags */
457  if (swf->audio_par && av_fifo_size(swf->audio_fifo)) {
458  int frame_size = av_fifo_size(swf->audio_fifo);
459  put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
460  avio_wl16(pb, swf->sound_samples);
461  avio_wl16(pb, 0); // seek samples
462  av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
463  put_swf_end_tag(s);
464 
465  /* update FIFO */
466  swf->sound_samples = 0;
467  }
468 
469  /* output the frame */
470  put_swf_tag(s, TAG_SHOWFRAME);
471  put_swf_end_tag(s);
472 
473  return 0;
474 }
475 
476 static int swf_write_audio(AVFormatContext *s,
477  AVCodecParameters *par, uint8_t *buf, int size)
478 {
479  SWFEncContext *swf = s->priv_data;
480 
481  /* Flash Player limit */
482  if (swf->swf_frame_number == 16000)
483  av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
484 
485  if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
486  av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
487  return -1;
488  }
489 
490  av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
491  swf->sound_samples += av_get_audio_frame_duration2(par, size);
492 
493  /* if audio only stream make sure we add swf frames */
494  if (!swf->video_par)
495  swf_write_video(s, par, 0, 0, 0);
496 
497  return 0;
498 }
499 
500 static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
501 {
502  AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
503  if (par->codec_type == AVMEDIA_TYPE_AUDIO)
504  return swf_write_audio(s, par, pkt->data, pkt->size);
505  else
506  return swf_write_video(s, par, pkt->data, pkt->size, pkt->flags);
507 }
508 
509 static int swf_write_trailer(AVFormatContext *s)
510 {
511  SWFEncContext *swf = s->priv_data;
512  AVIOContext *pb = s->pb;
513  int file_size;
514 
515  put_swf_tag(s, TAG_END);
516  put_swf_end_tag(s);
517 
518  /* patch file size and number of frames if not streamed */
519  if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && swf->video_par) {
520  file_size = avio_tell(pb);
521  avio_seek(pb, 4, SEEK_SET);
522  avio_wl32(pb, file_size);
523  avio_seek(pb, swf->duration_pos, SEEK_SET);
524  avio_wl16(pb, swf->video_frame_number);
525  if (swf->vframes_pos) {
526  avio_seek(pb, swf->vframes_pos, SEEK_SET);
527  avio_wl16(pb, swf->video_frame_number);
528  }
529  avio_seek(pb, file_size, SEEK_SET);
530  }
531  return 0;
532 }
533 
534 static void swf_deinit(AVFormatContext *s)
535 {
536  SWFEncContext *swf = s->priv_data;
537 
538  av_fifo_freep(&swf->audio_fifo);
539 }
540 
541 #if CONFIG_SWF_MUXER
542 AVOutputFormat ff_swf_muxer = {
543  .name = "swf",
544  .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
545  .mime_type = "application/x-shockwave-flash",
546  .extensions = "swf",
547  .priv_data_size = sizeof(SWFEncContext),
548  .audio_codec = AV_CODEC_ID_MP3,
549  .video_codec = AV_CODEC_ID_FLV1,
550  .write_header = swf_write_header,
551  .write_packet = swf_write_packet,
552  .write_trailer = swf_write_trailer,
553  .deinit = swf_deinit,
554  .flags = AVFMT_TS_NONSTRICT,
555 };
556 #endif
557 #if CONFIG_AVM2_MUXER
558 AVOutputFormat ff_avm2_muxer = {
559  .name = "avm2",
560  .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
561  .mime_type = "application/x-shockwave-flash",
562  .priv_data_size = sizeof(SWFEncContext),
563  .audio_codec = AV_CODEC_ID_MP3,
564  .video_codec = AV_CODEC_ID_FLV1,
565  .write_header = swf_write_header,
566  .write_packet = swf_write_packet,
567  .write_trailer = swf_write_trailer,
568  .deinit = swf_deinit,
569  .flags = AVFMT_TS_NONSTRICT,
570 };
571 #endif
AV_CODEC_ID_VP6F
@ AV_CODEC_ID_VP6F
Definition: codec_id.h:141
SWFEncContext
Definition: swfenc.c:32
AVOutputFormat::name
const char * name
Definition: avformat.h:491
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:56
max_nbits
static void max_nbits(int *nbits_ptr, int val)
Definition: swfenc.c:84
av_fifo_generic_write
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:122
swf_write_audio
static int swf_write_audio(AVFormatContext *s, AVCodecParameters *par, uint8_t *buf, int size)
Definition: swfenc.c:476
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
swf_write_header
static int swf_write_header(AVFormatContext *s)
Definition: swfenc.c:192
put_swf_end_tag
static void put_swf_end_tag(AVFormatContext *s)
Definition: swfenc.c:62
FLV_FRAME_INTER
@ FLV_FRAME_INTER
inter frame (for AVC, a non-seekable frame)
Definition: flv.h:117
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:66
DUMMY_FILE_SIZE
#define DUMMY_FILE_SIZE
Definition: swf.h:29
SWFEncContext::audio_fifo
AVFifoBuffer * audio_fifo
Definition: swfenc.c:41
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:218
AVPacket::data
uint8_t * data
Definition: packet.h:369
SWFEncContext::tag_pos
int64_t tag_pos
Definition: swfenc.c:34
AUDIO_FIFO_SIZE
#define AUDIO_FIFO_SIZE
Definition: swfenc.c:30
b
#define b
Definition: input.c:41
SWFEncContext::tag
int tag
Definition: swfenc.c:40
TAG_JPEG2
@ TAG_JPEG2
Definition: swf.h:53
av_fifo_generic_read
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))
Feed data from an AVFifoBuffer to a user-supplied callback.
Definition: fifo.c:213
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
swf_deinit
static void swf_deinit(AVFormatContext *s)
Definition: swfenc.c:534
AVFifoBuffer
Definition: fifo.h:31
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:455
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
fifo.h
TAG_VIDEOSTREAM
@ TAG_VIDEOSTREAM
Definition: swf.h:74
SHAPE_ID
#define SHAPE_ID
Definition: swf.h:110
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
val
static double val(void *priv, double ch)
Definition: aeval.c:76
SWFEncContext::video_st
AVStream * video_st
Definition: swfenc.c:43
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
TAG_SHOWFRAME
@ TAG_SHOWFRAME
Definition: swf.h:34
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:156
ff_avm2_muxer
AVOutputFormat ff_avm2_muxer
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
swf.h
mask
static const uint16_t mask[17]
Definition: lzw.c:38
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_swf_codec_tags
const AVCodecTag ff_swf_codec_tags[]
Definition: swf.c:25
frame_size
int frame_size
Definition: mxfenc.c:2206
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
FLV_FRAME_KEY
@ FLV_FRAME_KEY
key frame (for AVC, a seekable frame)
Definition: flv.h:116
TAG_PLACEOBJECT
@ TAG_PLACEOBJECT
Definition: swf.h:37
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
TAG_STREAMHEAD2
@ TAG_STREAMHEAD2
Definition: swf.h:67
DUMMY_DURATION
#define DUMMY_DURATION
Definition: swf.h:30
swf_write_trailer
static int swf_write_trailer(AVFormatContext *s)
Definition: swfenc.c:509
PutBitContext
Definition: put_bits.h:51
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:110
AVFormatContext
Format I/O context.
Definition: avformat.h:1231
PutBitContext::buf
uint8_t * buf
Definition: put_bits.h:54
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:902
NULL
#define NULL
Definition: coverity.c:32
SWFEncContext::vframes_pos
int64_t vframes_pos
Definition: swfenc.c:35
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
SWFEncContext::swf_frame_number
int swf_frame_number
Definition: swfenc.c:38
TAG_VIDEOFRAME
@ TAG_VIDEOFRAME
Definition: swf.h:75
TAG_PLACEOBJECT2
@ TAG_PLACEOBJECT2
Definition: swf.h:57
TAG_REMOVEOBJECT
@ TAG_REMOVEOBJECT
Definition: swf.h:38
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:203
AV_CODEC_ID_FLASHSV
@ AV_CODEC_ID_FLASHSV
Definition: codec_id.h:135
AV_CODEC_ID_VP6A
@ AV_CODEC_ID_VP6A
Definition: codec_id.h:155
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:170
BITMAP_ID
#define BITMAP_ID
Definition: swf.h:108
FLAG_MOVETO
#define FLAG_MOVETO
Definition: swf.h:103
SWFEncContext::sound_samples
int sound_samples
Definition: swfenc.c:37
flv.h
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: packet.h:370
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:117
TAG_STREAMBLOCK
@ TAG_STREAMBLOCK
Definition: swf.h:51
size
int size
Definition: twinvq_data.h:10344
TAG_LONG
#define TAG_LONG
Definition: swf.h:100
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:225
avio_wb32
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:383
height
#define height
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:375
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
version
version
Definition: libkvazaar.c:320
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
swf_write_video
static int swf_write_video(AVFormatContext *s, AVCodecParameters *par, const uint8_t *buf, int size, unsigned pkt_flags)
Definition: swfenc.c:365
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:56
i
int i
Definition: input.c:407
SWFEncContext::samples_per_frame
int samples_per_frame
Definition: swfenc.c:36
AVOutputFormat
Definition: avformat.h:490
AVCodecParameters::height
int height
Definition: codec_par.h:127
uint8_t
uint8_t
Definition: audio_convert.c:194
swf_write_packet
static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: swfenc.c:500
AVFMT_TS_NONSTRICT
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:472
SWFEncContext::audio_par
AVCodecParameters * audio_par
Definition: swfenc.c:42
TAG_FILEATTRIBUTES
@ TAG_FILEATTRIBUTES
Definition: swf.h:80
tag
uint32_t tag
Definition: movenc.c:1611
SWFEncContext::video_par
AVCodecParameters * video_par
Definition: swfenc.c:42
put_swf_rect
static void put_swf_rect(AVIOContext *pb, int xmin, int xmax, int ymin, int ymax)
Definition: swfenc.c:100
AVStream
Stream structure.
Definition: avformat.h:873
TAG_END
@ TAG_END
Definition: swf.h:33
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
ff_swf_muxer
AVOutputFormat ff_swf_muxer
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
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:379
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
AVRational::den
int den
Denominator.
Definition: rational.h:60
SWFEncContext::duration_pos
int64_t duration_pos
Definition: swfenc.c:33
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:3175
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:835
AVPacket::stream_index
int stream_index
Definition: packet.h:371
SWFEncContext::video_frame_number
int video_frame_number
Definition: swfenc.c:39
av_fifo_size
int av_fifo_size(const AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:77
TAG_DEFINESHAPE
@ TAG_DEFINESHAPE
Definition: swf.h:35
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:147
av_fifo_freep
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:346
put_swf_line_edge
static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
Definition: swfenc.c:127
d
d
Definition: ffmpeg_filter.c:158
av_fifo_alloc
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
TAG_FREECHARACTER
@ TAG_FREECHARACTER
Definition: swf.h:36
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
AV_CODEC_ID_FLV1
@ AV_CODEC_ID_FLV1
Definition: codec_id.h:70
put_bits.h
put_swf_tag
static void put_swf_tag(AVFormatContext *s, int tag)
Definition: swfenc.c:46
FRAC_BITS
#define FRAC_BITS
Definition: swfenc.c:154
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