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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 "avformat.h"
25 #include "swf.h"
26 
27 static void put_swf_tag(AVFormatContext *s, int tag)
28 {
29  SWFContext *swf = s->priv_data;
30  AVIOContext *pb = s->pb;
31 
32  swf->tag_pos = avio_tell(pb);
33  swf->tag = tag;
34  /* reserve some room for the tag */
35  if (tag & TAG_LONG) {
36  avio_wl16(pb, 0);
37  avio_wl32(pb, 0);
38  } else {
39  avio_wl16(pb, 0);
40  }
41 }
42 
44 {
45  SWFContext *swf = s->priv_data;
46  AVIOContext *pb = s->pb;
47  int64_t pos;
48  int tag_len, tag;
49 
50  pos = avio_tell(pb);
51  tag_len = pos - swf->tag_pos - 2;
52  tag = swf->tag;
53  avio_seek(pb, swf->tag_pos, SEEK_SET);
54  if (tag & TAG_LONG) {
55  tag &= ~TAG_LONG;
56  avio_wl16(pb, (tag << 6) | 0x3f);
57  avio_wl32(pb, tag_len - 4);
58  } else {
59  assert(tag_len < 0x3f);
60  avio_wl16(pb, (tag << 6) | tag_len);
61  }
62  avio_seek(pb, pos, SEEK_SET);
63 }
64 
65 static inline void max_nbits(int *nbits_ptr, int val)
66 {
67  int n;
68 
69  if (val == 0)
70  return;
71  val = abs(val);
72  n = 1;
73  while (val != 0) {
74  n++;
75  val >>= 1;
76  }
77  if (n > *nbits_ptr)
78  *nbits_ptr = n;
79 }
80 
81 static void put_swf_rect(AVIOContext *pb,
82  int xmin, int xmax, int ymin, int ymax)
83 {
84  PutBitContext p;
85  uint8_t buf[256];
86  int nbits, mask;
87 
88  init_put_bits(&p, buf, sizeof(buf));
89 
90  nbits = 0;
91  max_nbits(&nbits, xmin);
92  max_nbits(&nbits, xmax);
93  max_nbits(&nbits, ymin);
94  max_nbits(&nbits, ymax);
95  mask = (1 << nbits) - 1;
96 
97  /* rectangle info */
98  put_bits(&p, 5, nbits);
99  put_bits(&p, nbits, xmin & mask);
100  put_bits(&p, nbits, xmax & mask);
101  put_bits(&p, nbits, ymin & mask);
102  put_bits(&p, nbits, ymax & mask);
103 
104  flush_put_bits(&p);
105  avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
106 }
107 
108 static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
109 {
110  int nbits, mask;
111 
112  put_bits(pb, 1, 1); /* edge */
113  put_bits(pb, 1, 1); /* line select */
114  nbits = 2;
115  max_nbits(&nbits, dx);
116  max_nbits(&nbits, dy);
117 
118  mask = (1 << nbits) - 1;
119  put_bits(pb, 4, nbits - 2); /* 16 bits precision */
120  if (dx == 0) {
121  put_bits(pb, 1, 0);
122  put_bits(pb, 1, 1);
123  put_bits(pb, nbits, dy & mask);
124  } else if (dy == 0) {
125  put_bits(pb, 1, 0);
126  put_bits(pb, 1, 0);
127  put_bits(pb, nbits, dx & mask);
128  } else {
129  put_bits(pb, 1, 1);
130  put_bits(pb, nbits, dx & mask);
131  put_bits(pb, nbits, dy & mask);
132  }
133 }
134 
135 #define FRAC_BITS 16
136 
137 static void put_swf_matrix(AVIOContext *pb,
138  int a, int b, int c, int d, int tx, int ty)
139 {
140  PutBitContext p;
141  uint8_t buf[256];
142  int nbits;
143 
144  init_put_bits(&p, buf, sizeof(buf));
145 
146  put_bits(&p, 1, 1); /* a, d present */
147  nbits = 1;
148  max_nbits(&nbits, a);
149  max_nbits(&nbits, d);
150  put_bits(&p, 5, nbits); /* nb bits */
151  put_bits(&p, nbits, a);
152  put_bits(&p, nbits, d);
153 
154  put_bits(&p, 1, 1); /* b, c present */
155  nbits = 1;
156  max_nbits(&nbits, c);
157  max_nbits(&nbits, b);
158  put_bits(&p, 5, nbits); /* nb bits */
159  put_bits(&p, nbits, c);
160  put_bits(&p, nbits, b);
161 
162  nbits = 1;
163  max_nbits(&nbits, tx);
164  max_nbits(&nbits, ty);
165  put_bits(&p, 5, nbits); /* nb bits */
166  put_bits(&p, nbits, tx);
167  put_bits(&p, nbits, ty);
168 
169  flush_put_bits(&p);
170  avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
171 }
172 
174 {
175  SWFContext *swf = s->priv_data;
176  AVIOContext *pb = s->pb;
177  PutBitContext p;
178  uint8_t buf1[256];
179  int i, width, height, rate, rate_base;
180  int version;
181 
182  swf->sound_samples = 0;
183  swf->swf_frame_number = 0;
184  swf->video_frame_number = 0;
185 
186  for(i=0;i<s->nb_streams;i++) {
187  AVCodecContext *enc = s->streams[i]->codec;
188  if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
189  if (swf->audio_enc) {
190  av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
191  return AVERROR_INVALIDDATA;
192  }
193  if (enc->codec_id == AV_CODEC_ID_MP3) {
194  swf->audio_enc = enc;
196  if (!swf->audio_fifo)
197  return AVERROR(ENOMEM);
198  } else {
199  av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
200  return -1;
201  }
202  } else {
203  if (swf->video_enc) {
204  av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
205  return AVERROR_INVALIDDATA;
206  }
207  if (enc->codec_id == AV_CODEC_ID_VP6F ||
208  enc->codec_id == AV_CODEC_ID_FLV1 ||
209  enc->codec_id == AV_CODEC_ID_MJPEG) {
210  swf->video_enc = enc;
211  } else {
212  av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
213  return -1;
214  }
215  }
216  }
217 
218  if (!swf->video_enc) {
219  /* currently, cannot work correctly if audio only */
220  width = 320;
221  height = 200;
222  rate = 10;
223  rate_base= 1;
224  } else {
225  width = swf->video_enc->width;
226  height = swf->video_enc->height;
227  rate = swf->video_enc->time_base.den;
228  rate_base = swf->video_enc->time_base.num;
229  }
230 
231  if (!swf->audio_enc)
232  swf->samples_per_frame = (44100. * rate_base) / rate;
233  else
234  swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
235 
236  avio_write(pb, "FWS", 3);
237 
238  if (!strcmp("avm2", s->oformat->name))
239  version = 9;
240  else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F)
241  version = 8; /* version 8 and above support VP6 codec */
242  else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1)
243  version = 6; /* version 6 and above support FLV1 codec */
244  else
245  version = 4; /* version 4 for mpeg audio support */
246  avio_w8(pb, version);
247 
248  avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
249  (will be patched if not streamed) */
250 
251  put_swf_rect(pb, 0, width * 20, 0, height * 20);
252  avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
253  swf->duration_pos = avio_tell(pb);
254  avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
255 
256  /* avm2/swf v9 (also v8?) files require a file attribute tag */
257  if (version == 9) {
259  avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
260  put_swf_end_tag(s);
261  }
262 
263  /* define a shape with the jpeg inside */
264  if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) {
266 
267  avio_wl16(pb, SHAPE_ID); /* ID of shape */
268  /* bounding rectangle */
269  put_swf_rect(pb, 0, width, 0, height);
270  /* style info */
271  avio_w8(pb, 1); /* one fill style */
272  avio_w8(pb, 0x41); /* clipped bitmap fill */
273  avio_wl16(pb, BITMAP_ID); /* bitmap ID */
274  /* position of the bitmap */
275  put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
276  0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
277  avio_w8(pb, 0); /* no line style */
278 
279  /* shape drawing */
280  init_put_bits(&p, buf1, sizeof(buf1));
281  put_bits(&p, 4, 1); /* one fill bit */
282  put_bits(&p, 4, 0); /* zero line bit */
283 
284  put_bits(&p, 1, 0); /* not an edge */
286  put_bits(&p, 5, 1); /* nbits */
287  put_bits(&p, 1, 0); /* X */
288  put_bits(&p, 1, 0); /* Y */
289  put_bits(&p, 1, 1); /* set fill style 1 */
290 
291  /* draw the rectangle ! */
292  put_swf_line_edge(&p, width, 0);
293  put_swf_line_edge(&p, 0, height);
294  put_swf_line_edge(&p, -width, 0);
295  put_swf_line_edge(&p, 0, -height);
296 
297  /* end of shape */
298  put_bits(&p, 1, 0); /* not an edge */
299  put_bits(&p, 5, 0);
300 
301  flush_put_bits(&p);
302  avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
303 
304  put_swf_end_tag(s);
305  }
306 
307  if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) {
308  int v = 0;
309 
310  /* start sound */
312  switch(swf->audio_enc->sample_rate) {
313  case 11025: v |= 1 << 2; break;
314  case 22050: v |= 2 << 2; break;
315  case 44100: v |= 3 << 2; break;
316  default:
317  /* not supported */
318  av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
319  return -1;
320  }
321  v |= 0x02; /* 16 bit playback */
322  if (swf->audio_enc->channels == 2)
323  v |= 0x01; /* stereo playback */
324  avio_w8(s->pb, v);
325  v |= 0x20; /* mp3 compressed */
326  avio_w8(s->pb, v);
327  avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
328  avio_wl16(s->pb, 0);
329 
330  put_swf_end_tag(s);
331  }
332 
333  avio_flush(s->pb);
334  return 0;
335 }
336 
338  AVCodecContext *enc, const uint8_t *buf, int size)
339 {
340  SWFContext *swf = s->priv_data;
341  AVIOContext *pb = s->pb;
342 
343  /* Flash Player limit */
344  if (swf->swf_frame_number == 16000)
345  av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
346 
347  if (enc->codec_id == AV_CODEC_ID_VP6F ||
348  enc->codec_id == AV_CODEC_ID_FLV1) {
349  if (swf->video_frame_number == 0) {
350  /* create a new video object */
352  avio_wl16(pb, VIDEO_ID);
353  swf->vframes_pos = avio_tell(pb);
354  avio_wl16(pb, 15000); /* hard flash player limit */
355  avio_wl16(pb, enc->width);
356  avio_wl16(pb, enc->height);
357  avio_w8(pb, 0);
359  put_swf_end_tag(s);
360 
361  /* place the video object for the first time */
363  avio_w8(pb, 0x36);
364  avio_wl16(pb, 1);
365  avio_wl16(pb, VIDEO_ID);
366  put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
367  avio_wl16(pb, swf->video_frame_number);
368  avio_write(pb, "video", 5);
369  avio_w8(pb, 0x00);
370  put_swf_end_tag(s);
371  } else {
372  /* mark the character for update */
374  avio_w8(pb, 0x11);
375  avio_wl16(pb, 1);
376  avio_wl16(pb, swf->video_frame_number);
377  put_swf_end_tag(s);
378  }
379 
380  /* set video frame data */
382  avio_wl16(pb, VIDEO_ID);
383  avio_wl16(pb, swf->video_frame_number++);
384  avio_write(pb, buf, size);
385  put_swf_end_tag(s);
386  } else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
387  if (swf->swf_frame_number > 0) {
388  /* remove the shape */
390  avio_wl16(pb, SHAPE_ID); /* shape ID */
391  avio_wl16(pb, 1); /* depth */
392  put_swf_end_tag(s);
393 
394  /* free the bitmap */
396  avio_wl16(pb, BITMAP_ID);
397  put_swf_end_tag(s);
398  }
399 
401 
402  avio_wl16(pb, BITMAP_ID); /* ID of the image */
403 
404  /* a dummy jpeg header seems to be required */
405  avio_wb32(pb, 0xffd8ffd9);
406  /* write the jpeg image */
407  avio_write(pb, buf, size);
408 
409  put_swf_end_tag(s);
410 
411  /* draw the shape */
412 
414  avio_wl16(pb, SHAPE_ID); /* shape ID */
415  avio_wl16(pb, 1); /* depth */
416  put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
417  put_swf_end_tag(s);
418  }
419 
420  swf->swf_frame_number++;
421 
422  /* streaming sound always should be placed just before showframe tags */
423  if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) {
424  int frame_size = av_fifo_size(swf->audio_fifo);
426  avio_wl16(pb, swf->sound_samples);
427  avio_wl16(pb, 0); // seek samples
428  av_fifo_generic_read(swf->audio_fifo, pb, frame_size, &avio_write);
429  put_swf_end_tag(s);
430 
431  /* update FIFO */
432  swf->sound_samples = 0;
433  }
434 
435  /* output the frame */
437  put_swf_end_tag(s);
438 
439  avio_flush(s->pb);
440 
441  return 0;
442 }
443 
445  AVCodecContext *enc, uint8_t *buf, int size)
446 {
447  SWFContext *swf = s->priv_data;
448 
449  /* Flash Player limit */
450  if (swf->swf_frame_number == 16000)
451  av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
452 
453  if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
454  av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
455  return -1;
456  }
457 
458  av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
459  swf->sound_samples += av_get_audio_frame_duration(enc, size);
460 
461  /* if audio only stream make sure we add swf frames */
462  if (!swf->video_enc)
463  swf_write_video(s, enc, 0, 0);
464 
465  return 0;
466 }
467 
469 {
470  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
471  if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
472  return swf_write_audio(s, codec, pkt->data, pkt->size);
473  else
474  return swf_write_video(s, codec, pkt->data, pkt->size);
475 }
476 
478 {
479  SWFContext *swf = s->priv_data;
480  AVIOContext *pb = s->pb;
481  AVCodecContext *enc, *video_enc;
482  int file_size, i;
483 
484  video_enc = NULL;
485  for(i=0;i<s->nb_streams;i++) {
486  enc = s->streams[i]->codec;
487  if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
488  video_enc = enc;
489  else
490  av_fifo_free(swf->audio_fifo);
491  }
492 
493  put_swf_tag(s, TAG_END);
494  put_swf_end_tag(s);
495 
496  /* patch file size and number of frames if not streamed */
497  if (s->pb->seekable && video_enc) {
498  file_size = avio_tell(pb);
499  avio_seek(pb, 4, SEEK_SET);
500  avio_wl32(pb, file_size);
501  avio_seek(pb, swf->duration_pos, SEEK_SET);
502  avio_wl16(pb, swf->video_frame_number);
503  avio_seek(pb, swf->vframes_pos, SEEK_SET);
504  avio_wl16(pb, swf->video_frame_number);
505  avio_seek(pb, file_size, SEEK_SET);
506  }
507  return 0;
508 }
509 
510 #if CONFIG_SWF_MUXER
511 AVOutputFormat ff_swf_muxer = {
512  .name = "swf",
513  .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
514  .mime_type = "application/x-shockwave-flash",
515  .extensions = "swf",
516  .priv_data_size = sizeof(SWFContext),
517  .audio_codec = AV_CODEC_ID_MP3,
518  .video_codec = AV_CODEC_ID_FLV1,
523 };
524 #endif
525 #if CONFIG_AVM2_MUXER
526 AVOutputFormat ff_avm2_muxer = {
527  .name = "avm2",
528  .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
529  .mime_type = "application/x-shockwave-flash",
530  .priv_data_size = sizeof(SWFContext),
531  .audio_codec = AV_CODEC_ID_MP3,
532  .video_codec = AV_CODEC_ID_FLV1,
537 };
538 #endif
#define SHAPE_ID
Definition: swf.h:62
const AVCodecTag ff_swf_codec_tags[]
Definition: swf.c:25
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:336
Bytestream IO Context.
Definition: avio.h:68
#define TAG_SHOWFRAME
Definition: swf.h:36
int size
Definition: swf.h:67
#define TAG_REMOVEOBJECT
Definition: swf.h:40
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: assenc.c:58
#define TAG_STREAMHEAD2
Definition: swf.h:45
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:916
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
#define TAG_PLACEOBJECT2
Definition: swf.h:44
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:2116
#define TAG_FREECHARACTER
Definition: swf.h:38
#define DUMMY_DURATION
Definition: swf.h:33
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:82
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1465
Format I/O context.
Definition: avformat.h:828
#define TAG_VIDEOFRAME
Definition: swf.h:47
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:260
uint8_t
#define b
Definition: input.c:52
AVStream ** streams
Definition: avformat.h:876
#define TAG_FILEATTRIBUTES
Definition: swf.h:48
static void put_swf_rect(AVIOContext *pb, int xmin, int xmax, int ymin, int ymax)
Definition: swfenc.c:81
uint8_t * data
Definition: avcodec.h:915
#define BITMAP_ID
Definition: swf.h:60
static int flags
Definition: log.c:42
uint32_t tag
Definition: movenc.c:802
int swf_frame_number
Definition: swf.h:73
void av_fifo_free(AVFifoBuffer *f)
Free an AVFifoBuffer.
Definition: fifo.c:38
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
static int write_trailer(AVFormatContext *s)
Definition: assenc.c:67
static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
Definition: swfenc.c:108
struct AVOutputFormat * oformat
Definition: avformat.h:842
static const uint8_t frame_size[4]
Definition: g723_1_data.h:47
static int swf_write_video(AVFormatContext *s, AVCodecContext *enc, const uint8_t *buf, int size)
Definition: swfenc.c:337
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:201
int video_frame_number
Definition: swf.h:74
static const uint16_t mask[17]
Definition: lzw.c:38
#define TAG_JPEG2
Definition: swf.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
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:105
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:348
uint8_t * buf
Definition: put_bits.h:42
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
static void put_bits(PutBitContext *s, int n, unsigned int value)
Write up to 31 bits into a bitstream.
Definition: put_bits.h:136
int sound_samples
Definition: swf.h:72
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:641
unsigned int nb_streams
A list of all streams in the file.
Definition: avformat.h:875
int samples_per_frame
Definition: swf.h:71
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:117
int void avio_flush(AVIOContext *s)
Definition: aviobuf.c:180
struct SWFContext SWFContext
static void put_swf_tag(AVFormatContext *s, int tag)
Definition: swfenc.c:27
static void max_nbits(int *nbits_ptr, int val)
Definition: swfenc.c:65
static int swf_write_audio(AVFormatContext *s, AVCodecContext *enc, uint8_t *buf, int size)
Definition: swfenc.c:444
int width
picture width / height.
Definition: avcodec.h:1508
#define DUMMY_FILE_SIZE
Definition: swf.h:32
#define FLAG_SETFILL0
Definition: swf.h:54
const char * name
Definition: avformat.h:376
#define VIDEO_ID
AVCodecContext * audio_enc
Definition: swf.h:78
static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: swfenc.c:468
NULL
Definition: eval.c:52
static int width
Definition: utils.c:156
static int swf_write_header(AVFormatContext *s)
Definition: swfenc.c:173
enum AVMediaType codec_type
Definition: avcodec.h:1347
#define TAG_STREAMBLOCK
Definition: swf.h:42
version
Definition: ffv1enc.c:1069
enum AVCodecID codec_id
Definition: avcodec.h:1350
int sample_rate
samples per second
Definition: avcodec.h:2104
AVIOContext * pb
I/O context.
Definition: avformat.h:861
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:144
main external API structure.
Definition: avcodec.h:1339
AVCodecContext * video_enc
Definition: swf.h:78
#define FRAC_BITS
Definition: swfenc.c:135
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:1831
int64_t vframes_pos
Definition: swf.h:70
#define TAG_VIDEOSTREAM
Definition: swf.h:46
#define TAG_LONG
Definition: swf.h:50
int height
Definition: gxfenc.c:72
Main libavformat public API header.
int av_fifo_size(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:52
static void put_swf_end_tag(AVFormatContext *s)
Definition: swfenc.c:43
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:86
int64_t tag_pos
Definition: swf.h:69
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:52
int den
denominator
Definition: rational.h:45
#define TAG_END
Definition: swf.h:35
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:25
int channels
number of audio channels
Definition: avcodec.h:2105
void * priv_data
Format private data.
Definition: avformat.h:848
#define AUDIO_FIFO_SIZE
Definition: swf.h:57
int tag
Definition: swf.h:76
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:380
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:268
int stream_index
Definition: avcodec.h:917
AVFifoBuffer * audio_fifo
Definition: swf.h:77
static int swf_write_trailer(AVFormatContext *s)
Definition: swfenc.c:477
int64_t duration_pos
Definition: swf.h:68
#define TAG_DEFINESHAPE
Definition: swf.h:37
static void put_swf_matrix(AVIOContext *pb, int a, int b, int c, int d, int tx, int ty)
Definition: swfenc.c:137
This structure stores compressed data.
Definition: avcodec.h:898
#define TAG_PLACEOBJECT
Definition: swf.h:39
#define FLAG_MOVETO
Definition: swf.h:53
bitstream writer API