FFmpeg
swfdec.c
Go to the documentation of this file.
1 /*
2  * Flash Compatible Streaming Format demuxer
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.h"
24 
25 #if CONFIG_ZLIB
26 #include <zlib.h>
27 #endif
28 
29 #include "libavutil/avassert.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavcodec/get_bits.h"
35 #include "swf.h"
36 #include "flv.h"
37 
38 typedef struct SWFDecContext {
41 #if CONFIG_ZLIB
42 #define ZBUF_SIZE 4096
43  AVIOContext *zpb;
44  uint8_t *zbuf_in;
45  uint8_t *zbuf_out;
46  z_stream zstream;
47 #endif
49 
50 static const AVCodecTag swf_audio_codec_tags[] = {
51  { AV_CODEC_ID_PCM_S16LE, 0x00 },
52  { AV_CODEC_ID_ADPCM_SWF, 0x01 },
53  { AV_CODEC_ID_MP3, 0x02 },
54  { AV_CODEC_ID_PCM_S16LE, 0x03 },
55 // { AV_CODEC_ID_NELLYMOSER, 0x06 },
56  { AV_CODEC_ID_NONE, 0 },
57 };
58 
59 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
60 {
61  int tag, len;
62 
63  if (avio_feof(pb))
64  return AVERROR_EOF;
65 
66  tag = avio_rl16(pb);
67  len = tag & 0x3f;
68  tag = tag >> 6;
69  if (len == 0x3f) {
70  len = avio_rl32(pb);
71  }
72  *len_ptr = len;
73  return tag;
74 }
75 
76 
77 static int swf_probe(const AVProbeData *p)
78 {
79  GetBitContext gb;
80  int len, xmin, xmax, ymin, ymax;
81 
82  if(p->buf_size < 15)
83  return 0;
84 
85  /* check file header */
86  if ( AV_RB24(p->buf) != AV_RB24("CWS")
87  && AV_RB24(p->buf) != AV_RB24("FWS"))
88  return 0;
89 
90  if ( AV_RB24(p->buf) == AV_RB24("CWS")
91  && p->buf[3] <= 20)
92  return AVPROBE_SCORE_MAX / 4 + 1;
93 
94  if (init_get_bits8(&gb, p->buf + 8, p->buf_size - 8) < 0)
95  return 0;
96 
97  len = get_bits(&gb, 5);
98  if (!len)
99  return 0;
100  xmin = get_bits_long(&gb, len);
101  xmax = get_bits_long(&gb, len);
102  ymin = get_bits_long(&gb, len);
103  ymax = get_bits_long(&gb, len);
104  if (xmin || ymin || !xmax || !ymax)
105  return 0;
106 
107  if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
108  return AVPROBE_SCORE_MAX / 4;
109 
110  return AVPROBE_SCORE_EXTENSION + 1;
111 }
112 
113 #if CONFIG_ZLIB
114 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
115 {
116  AVFormatContext *s = opaque;
117  SWFDecContext *swf = s->priv_data;
118  z_stream *z = &swf->zstream;
119  int ret;
120 
121 retry:
122  if (!z->avail_in) {
123  int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
124  if (n < 0)
125  return n;
126  z->next_in = swf->zbuf_in;
127  z->avail_in = n;
128  }
129 
130  z->next_out = buf;
131  z->avail_out = buf_size;
132 
133  ret = inflate(z, Z_NO_FLUSH);
134  if (ret == Z_STREAM_END)
135  return AVERROR_EOF;
136  if (ret != Z_OK)
137  return AVERROR(EINVAL);
138 
139  if (buf_size - z->avail_out == 0)
140  goto retry;
141 
142  return buf_size - z->avail_out;
143 }
144 
145 static av_cold int swf_read_close(AVFormatContext *avctx);
146 #endif
147 
149 {
150  SWFDecContext *swf = s->priv_data;
151  AVIOContext *pb = s->pb;
152  int nbits, len, tag;
153 
154  tag = avio_rb32(pb) & 0xffffff00;
155  avio_rl32(pb);
156 
157  if (tag == MKBETAG('C', 'W', 'S', 0)) {
158  av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
159 #if CONFIG_ZLIB
160  if (inflateInit(&swf->zstream) != Z_OK) {
161  av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
162  return AVERROR(EINVAL);
163  }
164  if (!(swf->zbuf_in = av_malloc(ZBUF_SIZE)) ||
165  !(swf->zbuf_out = av_malloc(ZBUF_SIZE)) ||
166  !(swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0,
167  s, zlib_refill, NULL, NULL))) {
168  swf_read_close(s);
169  return AVERROR(ENOMEM);
170  }
171  swf->zpb->seekable = 0;
172  pb = swf->zpb;
173 #else
174  av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
175  return AVERROR(EIO);
176 #endif
177  } else if (tag != MKBETAG('F', 'W', 'S', 0))
178  return AVERROR(EIO);
179  /* skip rectangle size */
180  nbits = avio_r8(pb) >> 3;
181  len = (4 * nbits - 3 + 7) / 8;
182  avio_skip(pb, len);
183  swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
184  avio_rl16(pb); /* frame count */
185 
186  swf->samples_per_frame = 0;
188  return 0;
189 }
190 
192 {
193  int sample_rate_code, sample_size_code;
194  AVStream *ast = avformat_new_stream(s, NULL);
195  if (!ast)
196  return NULL;
197  ast->id = id;
198  if (info & 1) {
199  ast->codecpar->channels = 2;
201  } else {
202  ast->codecpar->channels = 1;
204  }
206  ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
208  sample_rate_code = info>>2 & 3;
209  sample_size_code = info>>1 & 1;
210  if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
212  ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
213  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
214  return ast;
215 }
216 
218 {
219  SWFDecContext *swf = s->priv_data;
220  AVIOContext *pb = s->pb;
221  AVStream *vst = NULL, *ast = NULL, *st = 0;
222  int tag, len, i, frame, v, res;
223 
224 #if CONFIG_ZLIB
225  if (swf->zpb)
226  pb = swf->zpb;
227 #endif
228 
229  for(;;) {
230  uint64_t pos = avio_tell(pb);
231  tag = get_swf_tag(pb, &len);
232  if (tag < 0)
233  return tag;
234  if (len < 0) {
235  av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
236  return AVERROR_INVALIDDATA;
237  }
238  if (tag == TAG_VIDEOSTREAM) {
239  int ch_id = avio_rl16(pb);
240  len -= 2;
241 
242  for (i=0; i<s->nb_streams; i++) {
243  st = s->streams[i];
244  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
245  goto skip;
246  }
247 
248  avio_rl16(pb);
249  avio_rl16(pb);
250  avio_rl16(pb);
251  avio_r8(pb);
252  /* Check for FLV1 */
253  vst = avformat_new_stream(s, NULL);
254  if (!vst)
255  return AVERROR(ENOMEM);
256  vst->id = ch_id;
259  avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
260  len -= 8;
261  } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
262  /* streaming found */
263 
264  for (i=0; i<s->nb_streams; i++) {
265  st = s->streams[i];
266  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
267  goto skip;
268  }
269 
270  avio_r8(pb);
271  v = avio_r8(pb);
272  swf->samples_per_frame = avio_rl16(pb);
273  ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
274  if (!ast)
275  return AVERROR(ENOMEM);
276  len -= 4;
277  } else if (tag == TAG_DEFINESOUND) {
278  /* audio stream */
279  int ch_id = avio_rl16(pb);
280 
281  for (i=0; i<s->nb_streams; i++) {
282  st = s->streams[i];
283  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
284  goto skip;
285  }
286 
287  // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
288  // these are smaller audio streams in DEFINESOUND tags, but it's technically
289  // possible they could be huge. Break it up into multiple packets if it's big.
290  v = avio_r8(pb);
291  ast = create_new_audio_stream(s, ch_id, v);
292  if (!ast)
293  return AVERROR(ENOMEM);
294  ast->duration = avio_rl32(pb); // number of samples
295  if (((v>>4) & 15) == 2) { // MP3 sound data record
296  ast->internal->skip_samples = avio_rl16(pb);
297  len -= 2;
298  }
299  len -= 7;
300  if ((res = av_get_packet(pb, pkt, len)) < 0)
301  return res;
302  pkt->pos = pos;
303  pkt->stream_index = ast->index;
304  return pkt->size;
305  } else if (tag == TAG_VIDEOFRAME) {
306  int ch_id = avio_rl16(pb);
307  len -= 2;
308  for(i=0; i<s->nb_streams; i++) {
309  st = s->streams[i];
310  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
311  int pkt_flags = 0;
312  frame = avio_rl16(pb);
313  len -= 2;
314  if (len <= 0)
315  goto skip;
316  if (st->codecpar->codec_id == AV_CODEC_ID_FLASHSV) {
317  unsigned flags = avio_r8(pb);
318  len--;
319  if (len <= 0)
320  goto skip;
321  pkt_flags |= (flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ? AV_PKT_FLAG_KEY : 0;
322  }
323  if ((res = av_get_packet(pb, pkt, len)) < 0)
324  return res;
325  pkt->pos = pos;
326  pkt->pts = frame;
327  pkt->stream_index = st->index;
328  pkt->flags |= pkt_flags;
329  return pkt->size;
330  }
331  }
332  } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
333 #if CONFIG_ZLIB
334  long out_len;
335  uint8_t *buf = NULL, *zbuf = NULL, *pal;
336  uint32_t colormap[AVPALETTE_COUNT] = {0};
337  const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
338  const int colormapbpp = 3 + alpha_bmp;
339  int linesize, colormapsize = 0;
340 
341  const int ch_id = avio_rl16(pb);
342  const int bmp_fmt = avio_r8(pb);
343  const int width = avio_rl16(pb);
344  const int height = avio_rl16(pb);
345  int pix_fmt;
346 
347  len -= 2+1+2+2;
348 
349  switch (bmp_fmt) {
350  case 3: // PAL-8
351  linesize = width;
352  colormapsize = avio_r8(pb) + 1;
353  len--;
354  break;
355  case 4: // RGB15
356  linesize = width * 2;
357  break;
358  case 5: // RGB24 (0RGB)
359  linesize = width * 4;
360  break;
361  default:
362  av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
363  goto bitmap_end_skip;
364  }
365 
366  linesize = FFALIGN(linesize, 4);
367 
368  if (av_image_check_size(width, height, 0, s) < 0 ||
369  linesize >= INT_MAX / height ||
370  linesize * height >= INT_MAX - colormapsize * colormapbpp) {
371  av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
372  goto bitmap_end_skip;
373  }
374 
375  out_len = colormapsize * colormapbpp + linesize * height;
376 
377  ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
378  ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
379 
380  zbuf = av_malloc(len);
381  if (!zbuf) {
382  res = AVERROR(ENOMEM);
383  goto bitmap_end;
384  }
385 
386  len = avio_read(pb, zbuf, len);
387  if (len < 0)
388  goto bitmap_end_skip;
389 
390  buf = av_malloc(out_len);
391  if (!buf) {
392  res = AVERROR(ENOMEM);
393  goto bitmap_end;
394  }
395  if ((res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
396  av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
397  goto bitmap_end_skip;
398  }
399 
400  for (i = 0; i < s->nb_streams; i++) {
401  st = s->streams[i];
402  if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
403  break;
404  }
405  if (i == s->nb_streams) {
406  vst = avformat_new_stream(s, NULL);
407  if (!vst) {
408  res = AVERROR(ENOMEM);
409  goto bitmap_end;
410  }
411  vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
414  avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
415  st = vst;
416  }
417 
418  if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
419  goto bitmap_end;
420  if (!st->codecpar->width && !st->codecpar->height) {
421  st->codecpar->width = width;
422  st->codecpar->height = height;
423  } else {
424  ff_add_param_change(pkt, 0, 0, 0, width, height);
425  }
426  pkt->pos = pos;
427  pkt->stream_index = st->index;
428 
429  if (linesize * height > pkt->size) {
430  res = AVERROR_INVALIDDATA;
431  goto bitmap_end;
432  }
433 
434  switch (bmp_fmt) {
435  case 3:
436  pix_fmt = AV_PIX_FMT_PAL8;
437  for (i = 0; i < colormapsize; i++)
438  if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
439  else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
441  if (!pal) {
442  res = AVERROR(ENOMEM);
443  goto bitmap_end;
444  }
445  memcpy(pal, colormap, AVPALETTE_SIZE);
446  break;
447  case 4:
448  pix_fmt = AV_PIX_FMT_RGB555;
449  break;
450  case 5:
451  pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
452  break;
453  default:
454  av_assert0(0);
455  }
456  if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
457  av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
458  } else
459  st->codecpar->format = pix_fmt;
460 
461  memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
462 
463  res = pkt->size;
464 
465 bitmap_end:
466  av_freep(&zbuf);
467  av_freep(&buf);
468  return res;
469 bitmap_end_skip:
470  av_freep(&zbuf);
471  av_freep(&buf);
472 #else
473  av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
474 #endif
475  } else if (tag == TAG_STREAMBLOCK) {
476  for (i = 0; i < s->nb_streams; i++) {
477  st = s->streams[i];
478  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
479  if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
480  avio_skip(pb, 4);
481  len -= 4;
482  if (len <= 0)
483  goto skip;
484  if ((res = av_get_packet(pb, pkt, len)) < 0)
485  return res;
486  } else { // ADPCM, PCM
487  if (len <= 0)
488  goto skip;
489  if ((res = av_get_packet(pb, pkt, len)) < 0)
490  return res;
491  }
492  pkt->pos = pos;
493  pkt->stream_index = st->index;
494  return pkt->size;
495  }
496  }
497  } else if (tag == TAG_JPEG2) {
498  for (i=0; i<s->nb_streams; i++) {
499  st = s->streams[i];
500  if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
501  break;
502  }
503  if (i == s->nb_streams) {
504  vst = avformat_new_stream(s, NULL);
505  if (!vst)
506  return AVERROR(ENOMEM);
507  vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
510  avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
511  st = vst;
512  }
513  avio_rl16(pb); /* BITMAP_ID */
514  len -= 2;
515  if (len < 4)
516  goto skip;
517  if ((res = av_new_packet(pkt, len)) < 0)
518  return res;
519  if (avio_read(pb, pkt->data, 4) != 4) {
520  return AVERROR_INVALIDDATA;
521  }
522  if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
523  AV_RB32(pkt->data) == 0xffd9ffd8) {
524  /* old SWF files containing SOI/EOI as data start */
525  /* files created by swink have reversed tag */
526  pkt->size -= 4;
527  memset(pkt->data+pkt->size, 0, 4);
528  res = avio_read(pb, pkt->data, pkt->size);
529  } else {
530  res = avio_read(pb, pkt->data + 4, pkt->size - 4);
531  if (res >= 0)
532  res += 4;
533  }
534  if (res != pkt->size) {
535  if (res < 0) {
536  return res;
537  }
538  av_shrink_packet(pkt, res);
539  }
540 
541  pkt->pos = pos;
542  pkt->stream_index = st->index;
543  return pkt->size;
544  } else {
545  av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
546  }
547  skip:
548  if(len<0)
549  av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
550  len = FFMAX(0, len);
551  avio_skip(pb, len);
552  }
553 }
554 
555 #if CONFIG_ZLIB
556 static av_cold int swf_read_close(AVFormatContext *avctx)
557 {
558  SWFDecContext *s = avctx->priv_data;
559  inflateEnd(&s->zstream);
560  av_freep(&s->zbuf_in);
561  av_freep(&s->zbuf_out);
562  avio_context_free(&s->zpb);
563  return 0;
564 }
565 #endif
566 
568  .name = "swf",
569  .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
570  .priv_data_size = sizeof(SWFDecContext),
574 #if CONFIG_ZLIB
575  .read_close = swf_read_close,
576 #endif
577 };
const AVCodecTag ff_swf_codec_tags[]
Definition: swf.c:25
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static enum AVPixelFormat pix_fmt
static int get_swf_tag(AVIOContext *pb, int *len_ptr)
Definition: swfdec.c:59
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3103
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:383
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:103
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:4900
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int size
Definition: packet.h:364
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1288
Format I/O context.
Definition: avformat.h:1239
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
#define av_cold
Definition: attributes.h:88
#define av_malloc(s)
int width
Video only.
Definition: codec_par.h:126
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1183
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:785
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
enum AVStreamParseType need_parsing
Definition: avformat.h:1088
int id
Format-specific stream ID.
Definition: avformat.h:887
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4481
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:91
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1307
#define height
uint8_t * data
Definition: packet.h:363
uint32_t tag
Definition: movenc.c:1597
#define ff_dlog(a,...)
#define AVERROR_EOF
End of file.
Definition: error.h:55
bitstream reader API header.
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define FFALIGN(x, a)
Definition: macros.h:48
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:637
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:401
#define U(x)
Definition: vp56_arith.h:37
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:138
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVInputFormat ff_swf_demuxer
Definition: swfdec.c:567
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: packet.h:46
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:754
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
key frame (for AVC, a seekable frame)
Definition: flv.h:116
unsigned int pos
Definition: spdifenc.c:410
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:422
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int ff_add_param_change(AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height)
Add side data to a packet for changing parameters to the given values.
Definition: utils.c:5032
simple assert() macros that are a bit more flexible than ISO C assert().
#define FFMAX(a, b)
Definition: common.h:102
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:369
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:628
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1295
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:317
MIPS optimizations info
Definition: mips.txt:2
audio channel layout utility functions
static const AVCodecTag swf_audio_codec_tags[]
Definition: swfdec.c:50
#define width
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: swf.h:53
#define s(width, name)
Definition: cbs_vp9.c:257
static int swf_probe(const AVProbeData *p)
Definition: swfdec.c:77
static AVStream * create_new_audio_stream(AVFormatContext *s, int id, int info)
Definition: swfdec.c:191
int frame_rate
Definition: swfdec.c:40
static int swf_read_header(AVFormatContext *s)
Definition: swfdec.c:148
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:880
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
FLV common header.
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:91
AVIOContext * pb
I/O context.
Definition: avformat.h:1281
int samples_per_frame
Definition: swfdec.c:39
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
Definition: vf_neighbor.c:198
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
#define AVPALETTE_COUNT
Definition: pixfmt.h:33
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: swfdec.c:217
full parsing and repack
Definition: avformat.h:799
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:738
#define FLV_VIDEO_FRAMETYPE_MASK
Definition: flv.h:45
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:155
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:387
#define MKBETAG(a, b, c, d)
Definition: common.h:414
int len
void * priv_data
Format private data.
Definition: avformat.h:1267
int channels
Audio only.
Definition: codec_par.h:166
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:652
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1045
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:368
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:332
int stream_index
Definition: packet.h:365
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
#define AV_CH_LAYOUT_MONO
packed RGB 8:8:8, 32bpp, XRGBXRGB... X=unused/undefined
Definition: pixfmt.h:237
enum AVCodecID id
This structure stores compressed data.
Definition: packet.h:340
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:356
int i
Definition: input.c:407