FFmpeg
flashsv.c
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1 /*
2  * Flash Screen Video decoder
3  * Copyright (C) 2004 Alex Beregszaszi
4  * Copyright (C) 2006 Benjamin Larsson
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 /**
24  * @file
25  * Flash Screen Video decoder
26  * @author Alex Beregszaszi
27  * @author Benjamin Larsson
28  * @author Daniel Verkamp
29  * @author Konstantin Shishkov
30  *
31  * A description of the bitstream format for Flash Screen Video version 1/2
32  * is part of the SWF File Format Specification (version 10), which can be
33  * downloaded from http://www.adobe.com/devnet/swf.html.
34  */
35 
36 #include "config_components.h"
37 
38 #include <stddef.h>
39 #include <zlib.h>
40 
41 #include "libavutil/intreadwrite.h"
42 #include "avcodec.h"
43 #include "bytestream.h"
44 #include "codec_internal.h"
45 #include "decode.h"
46 #include "get_bits.h"
47 #include "zlib_wrapper.h"
48 
49 typedef struct BlockInfo {
50  const uint8_t *pos;
51  int size;
52 } BlockInfo;
53 
54 typedef struct FlashSVContext {
59  uint8_t *tmpblock;
61  int ver;
62  const uint32_t *pal;
64  const uint8_t *keyframedata;
66  uint8_t *keyframe;
72  uint8_t tmp[UINT16_MAX];
74 
75 static int decode_hybrid(const uint8_t *sptr, const uint8_t *sptr_end, uint8_t *dptr, int dx, int dy,
76  int h, int w, int stride, const uint32_t *pal)
77 {
78  int x, y;
79  const uint8_t *orig_src = sptr;
80 
81  for (y = dx + h; y > dx; y--) {
82  uint8_t *dst = dptr + (y * stride) + dy * 3;
83  for (x = 0; x < w; x++) {
84  if (sptr >= sptr_end)
85  return AVERROR_INVALIDDATA;
86  if (*sptr & 0x80) {
87  /* 15-bit color */
88  unsigned c = AV_RB16(sptr) & ~0x8000;
89  unsigned b = c & 0x1F;
90  unsigned g = (c >> 5) & 0x1F;
91  unsigned r = c >> 10;
92  /* 000aaabb -> aaabbaaa */
93  *dst++ = (b << 3) | (b >> 2);
94  *dst++ = (g << 3) | (g >> 2);
95  *dst++ = (r << 3) | (r >> 2);
96  sptr += 2;
97  } else {
98  /* palette index */
99  uint32_t c = pal[*sptr++];
100  bytestream_put_le24(&dst, c);
101  }
102  }
103  }
104  return sptr - orig_src;
105 }
106 
108 {
109  FlashSVContext *s = avctx->priv_data;
110 
111  ff_inflate_end(&s->zstream);
112  /* release the frame if needed */
113  av_frame_free(&s->frame);
114 
115  /* free the tmpblock */
116  av_freep(&s->tmpblock);
117 
118  return 0;
119 }
120 
122 {
123  FlashSVContext *s = avctx->priv_data;
124 
125  s->avctx = avctx;
126  avctx->pix_fmt = AV_PIX_FMT_BGR24;
127 
128  s->frame = av_frame_alloc();
129  if (!s->frame) {
130  return AVERROR(ENOMEM);
131  }
132 
133  return ff_inflate_init(&s->zstream, avctx);
134 }
135 
136 static int flashsv2_prime(FlashSVContext *s, const uint8_t *src, int size)
137 {
138  int zret; // Zlib return code
139  static const uint8_t zlib_header[] = { 0x78, 0x01 };
140  z_stream *const zstream = &s->zstream.zstream;
141  uint8_t *data = s->tmpblock;
142  unsigned remaining;
143 
144  if (!src)
145  return AVERROR_INVALIDDATA;
146 
147  zstream->next_in = src;
148  zstream->avail_in = size;
149  zstream->next_out = data;
150  zstream->avail_out = s->block_size * 3;
151  zret = inflate(zstream, Z_SYNC_FLUSH);
152  if (zret != Z_OK && zret != Z_STREAM_END)
153  return AVERROR_UNKNOWN;
154  remaining = s->block_size * 3 - zstream->avail_out;
155 
156  if ((zret = inflateReset(zstream)) != Z_OK) {
157  av_log(s->avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
158  return AVERROR_UNKNOWN;
159  }
160 
161  /* Create input for zlib that is equivalent to encoding the output
162  * from above and decoding it again (the net result of this is that
163  * the dictionary of past decoded data is correctly primed and
164  * the adler32 checksum is correctly initialized).
165  * This is accomplished by synthetizing blocks of uncompressed data
166  * out of the output from above. See section 3.2.4 of RFC 1951. */
167  zstream->next_in = zlib_header;
168  zstream->avail_in = sizeof(zlib_header);
169  zret = inflate(zstream, Z_SYNC_FLUSH);
170  if (zret != Z_OK)
171  return AVERROR_UNKNOWN;
172  while (remaining > 0) {
173  unsigned block_size = FFMIN(UINT16_MAX, remaining);
174  uint8_t header[5];
175  /* Bit 0: Non-last-block, bits 1-2: BTYPE for uncompressed block */
176  header[0] = 0;
177  /* Block size */
178  AV_WL16(header + 1, block_size);
179  /* Block size (one's complement) */
180  AV_WL16(header + 3, block_size ^ 0xFFFF);
181  zstream->next_in = header;
182  zstream->avail_in = sizeof(header);
183  zstream->next_out = s->tmp;
184  zstream->avail_out = sizeof(s->tmp);
185  zret = inflate(zstream, Z_SYNC_FLUSH);
186  if (zret != Z_OK)
187  return AVERROR_UNKNOWN;
188  zstream->next_in = data;
189  zstream->avail_in = block_size;
190  zret = inflate(zstream, Z_SYNC_FLUSH);
191  if (zret != Z_OK)
192  return AVERROR_UNKNOWN;
193  data += block_size;
194  remaining -= block_size;
195  }
196 
197  return 0;
198 }
199 
200 static int flashsv_decode_block(AVCodecContext *avctx, const AVPacket *avpkt,
201  GetBitContext *gb, int block_size,
202  int width, int height, int x_pos, int y_pos,
203  int blk_idx)
204 {
205  struct FlashSVContext *s = avctx->priv_data;
206  z_stream *const zstream = &s->zstream.zstream;
207  uint8_t *line = s->tmpblock;
208  int k;
209  int ret = inflateReset(zstream);
210  if (ret != Z_OK) {
211  av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
212  return AVERROR_UNKNOWN;
213  }
214  if (s->zlibprime_curr || s->zlibprime_prev) {
215  ret = flashsv2_prime(s,
216  s->blocks[blk_idx].pos,
217  s->blocks[blk_idx].size);
218  if (ret < 0)
219  return ret;
220  }
221  zstream->next_in = avpkt->data + get_bits_count(gb) / 8;
222  zstream->avail_in = block_size;
223  zstream->next_out = s->tmpblock;
224  zstream->avail_out = s->block_size * 3;
225  ret = inflate(zstream, Z_FINISH);
226  if (ret == Z_DATA_ERROR) {
227  av_log(avctx, AV_LOG_ERROR, "Zlib resync occurred\n");
228  inflateSync(zstream);
229  ret = inflate(zstream, Z_FINISH);
230  }
231 
232  if (ret != Z_OK && ret != Z_STREAM_END) {
233  //return -1;
234  }
235 
236  if (s->is_keyframe) {
237  s->blocks[blk_idx].pos = s->keyframedata + (get_bits_count(gb) / 8);
238  s->blocks[blk_idx].size = block_size;
239  }
240 
241  y_pos += s->diff_start;
242 
243  if (!s->color_depth) {
244  /* Flash Screen Video stores the image upside down, so copy
245  * lines to destination in reverse order. */
246  for (k = 1; k <= s->diff_height; k++) {
247  memcpy(s->frame->data[0] + x_pos * 3 +
248  (s->image_height - y_pos - k) * s->frame->linesize[0],
249  line, width * 3);
250  /* advance source pointer to next line */
251  line += width * 3;
252  }
253  } else {
254  /* hybrid 15-bit/palette mode */
255  ret = decode_hybrid(s->tmpblock, zstream->next_out,
256  s->frame->data[0],
257  s->image_height - (y_pos + 1 + s->diff_height),
258  x_pos, s->diff_height, width,
259  s->frame->linesize[0], s->pal);
260  if (ret < 0) {
261  av_log(avctx, AV_LOG_ERROR, "decode_hybrid failed\n");
262  return ret;
263  }
264  }
265  skip_bits_long(gb, 8 * block_size); /* skip the consumed bits */
266  return 0;
267 }
268 
270  int *got_frame, AVPacket *avpkt)
271 {
272  int buf_size = avpkt->size;
274  int h_blocks, v_blocks, h_part, v_part, i, j, ret;
275  GetBitContext gb;
276  int last_blockwidth = s->block_width;
277  int last_blockheight= s->block_height;
278 
279  /* no supplementary picture */
280  if (buf_size == 0)
281  return 0;
282  if (buf_size < 4)
283  return -1;
284 
285  if ((ret = init_get_bits8(&gb, avpkt->data, buf_size)) < 0)
286  return ret;
287 
288  /* start to parse the bitstream */
289  s->block_width = 16 * (get_bits(&gb, 4) + 1);
290  s->image_width = get_bits(&gb, 12);
291  s->block_height = 16 * (get_bits(&gb, 4) + 1);
292  s->image_height = get_bits(&gb, 12);
293 
294  if ( last_blockwidth != s->block_width
295  || last_blockheight!= s->block_height)
296  av_freep(&s->blocks);
297 
298  if (s->ver == 2) {
299  skip_bits(&gb, 6);
300  if (get_bits1(&gb)) {
301  avpriv_request_sample(avctx, "iframe");
302  return AVERROR_PATCHWELCOME;
303  }
304  if (get_bits1(&gb)) {
305  avpriv_request_sample(avctx, "Custom palette");
306  return AVERROR_PATCHWELCOME;
307  }
308  }
309 
310  /* calculate number of blocks and size of border (partial) blocks */
311  h_blocks = s->image_width / s->block_width;
312  h_part = s->image_width % s->block_width;
313  v_blocks = s->image_height / s->block_height;
314  v_part = s->image_height % s->block_height;
315 
316  /* the block size could change between frames, make sure the buffer
317  * is large enough, if not, get a larger one */
318  if (s->block_size < s->block_width * s->block_height) {
319  int tmpblock_size = 3 * s->block_width * s->block_height, err;
320 
321  if ((err = av_reallocp(&s->tmpblock, tmpblock_size)) < 0) {
322  s->block_size = 0;
324  "Cannot allocate decompression buffer.\n");
325  return err;
326  }
327  }
328  s->block_size = s->block_width * s->block_height;
329 
330  /* initialize the image size once */
331  if (avctx->width == 0 && avctx->height == 0) {
332  if ((ret = ff_set_dimensions(avctx, s->image_width, s->image_height)) < 0)
333  return ret;
334  }
335 
336  /* check for changes of image width and image height */
337  if (avctx->width != s->image_width || avctx->height != s->image_height) {
339  "Frame width or height differs from first frame!\n");
340  av_log(avctx, AV_LOG_ERROR, "fh = %d, fv %d vs ch = %d, cv = %d\n",
341  avctx->height, avctx->width, s->image_height, s->image_width);
342  return AVERROR_INVALIDDATA;
343  }
344 
345  /* we care for keyframes only in Screen Video v2 */
346  s->is_keyframe = (avpkt->flags & AV_PKT_FLAG_KEY) && (s->ver == 2);
347  if (s->is_keyframe) {
348  int err = av_buffer_replace(&s->keyframedata_buf, avpkt->buf);
349  if (err < 0)
350  return err;
351  s->keyframedata = avpkt->data;
352  if (s->blocks)
353  memset(s->blocks, 0, (v_blocks + !!v_part) * (h_blocks + !!h_part) *
354  sizeof(s->blocks[0]));
355  }
356  if(s->ver == 2 && !s->blocks)
357  s->blocks = av_mallocz((v_blocks + !!v_part) * (h_blocks + !!h_part) *
358  sizeof(s->blocks[0]));
359 
360  ff_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",
361  s->image_width, s->image_height, s->block_width, s->block_height,
362  h_blocks, v_blocks, h_part, v_part);
363 
364  if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
365  return ret;
366 
367  /* loop over all block columns */
368  for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
369 
370  int y_pos = j * s->block_height; // vertical position in frame
371  int cur_blk_height = (j < v_blocks) ? s->block_height : v_part;
372 
373  /* loop over all block rows */
374  for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
375  int x_pos = i * s->block_width; // horizontal position in frame
376  int cur_blk_width = (i < h_blocks) ? s->block_width : h_part;
377  int has_diff = 0;
378 
379  /* get the size of the compressed zlib chunk */
380  int size = get_bits(&gb, 16);
381 
382  s->color_depth = 0;
383  s->zlibprime_curr = 0;
384  s->zlibprime_prev = 0;
385  s->diff_start = 0;
386  s->diff_height = cur_blk_height;
387 
388  if (8 * size > get_bits_left(&gb)) {
389  av_frame_unref(s->frame);
390  return AVERROR_INVALIDDATA;
391  }
392 
393  if (s->ver == 2 && size) {
394  skip_bits(&gb, 3);
395  s->color_depth = get_bits(&gb, 2);
396  has_diff = get_bits1(&gb);
397  s->zlibprime_curr = get_bits1(&gb);
398  s->zlibprime_prev = get_bits1(&gb);
399 
400  if (s->color_depth != 0 && s->color_depth != 2) {
402  "%dx%d invalid color depth %d\n",
403  i, j, s->color_depth);
404  return AVERROR_INVALIDDATA;
405  }
406 
407  if (has_diff) {
408  if (size < 3) {
409  av_log(avctx, AV_LOG_ERROR, "size too small for diff\n");
410  return AVERROR_INVALIDDATA;
411  }
412  if (!s->keyframe) {
414  "Inter frame without keyframe\n");
415  return AVERROR_INVALIDDATA;
416  }
417  s->diff_start = get_bits(&gb, 8);
418  s->diff_height = get_bits(&gb, 8);
419  if (s->diff_start + s->diff_height > cur_blk_height) {
421  "Block parameters invalid: %d + %d > %d\n",
422  s->diff_start, s->diff_height, cur_blk_height);
423  return AVERROR_INVALIDDATA;
424  }
426  "%dx%d diff start %d height %d\n",
427  i, j, s->diff_start, s->diff_height);
428  size -= 2;
429  }
430 
431  if (s->zlibprime_prev)
432  av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_prev\n", i, j);
433 
434  if (s->zlibprime_curr) {
435  int col = get_bits(&gb, 8);
436  int row = get_bits(&gb, 8);
437  av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_curr %dx%d\n",
438  i, j, col, row);
439  if (size < 3) {
440  av_log(avctx, AV_LOG_ERROR, "size too small for zlibprime_curr\n");
441  return AVERROR_INVALIDDATA;
442  }
443  size -= 2;
444  avpriv_request_sample(avctx, "zlibprime_curr");
445  return AVERROR_PATCHWELCOME;
446  }
447  if (!s->blocks && (s->zlibprime_curr || s->zlibprime_prev)) {
449  "no data available for zlib priming\n");
450  return AVERROR_INVALIDDATA;
451  }
452  size--; // account for flags byte
453  }
454 
455  if (has_diff) {
456  int k;
457  int off = (s->image_height - y_pos - 1) * s->frame->linesize[0];
458 
459  for (k = 0; k < cur_blk_height; k++) {
460  int x = off - k * s->frame->linesize[0] + x_pos * 3;
461  memcpy(s->frame->data[0] + x, s->keyframe + x,
462  cur_blk_width * 3);
463  }
464  }
465 
466  /* skip unchanged blocks, which have size 0 */
467  if (size) {
468  if (flashsv_decode_block(avctx, avpkt, &gb, size,
469  cur_blk_width, cur_blk_height,
470  x_pos, y_pos,
471  i + j * (h_blocks + !!h_part)))
473  "error in decompression of block %dx%d\n", i, j);
474  }
475  }
476  }
477  if (s->is_keyframe && s->ver == 2) {
478  if (!s->keyframe) {
479  s->keyframe = av_malloc(s->frame->linesize[0] * avctx->height);
480  if (!s->keyframe) {
481  av_log(avctx, AV_LOG_ERROR, "Cannot allocate image data\n");
482  return AVERROR(ENOMEM);
483  }
484  }
485  memcpy(s->keyframe, s->frame->data[0],
486  s->frame->linesize[0] * avctx->height);
487  }
488 
489  if ((ret = av_frame_ref(rframe, s->frame)) < 0)
490  return ret;
491 
492  *got_frame = 1;
493 
494  if ((get_bits_count(&gb) / 8) != buf_size)
495  av_log(avctx, AV_LOG_ERROR, "buffer not fully consumed (%d != %d)\n",
496  buf_size, (get_bits_count(&gb) / 8));
497 
498  /* report that the buffer was completely consumed */
499  return buf_size;
500 }
501 
502 #if CONFIG_FLASHSV_DECODER
503 const FFCodec ff_flashsv_decoder = {
504  .p.name = "flashsv",
505  CODEC_LONG_NAME("Flash Screen Video v1"),
506  .p.type = AVMEDIA_TYPE_VIDEO,
507  .p.id = AV_CODEC_ID_FLASHSV,
508  .priv_data_size = sizeof(FlashSVContext),
510  .close = flashsv_decode_end,
512  .p.capabilities = AV_CODEC_CAP_DR1,
513  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
514  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
515 };
516 #endif /* CONFIG_FLASHSV_DECODER */
517 
518 #if CONFIG_FLASHSV2_DECODER
519 static const uint32_t ff_flashsv2_default_palette[128] = {
520  0x000000, 0x333333, 0x666666, 0x999999, 0xCCCCCC, 0xFFFFFF,
521  0x330000, 0x660000, 0x990000, 0xCC0000, 0xFF0000, 0x003300,
522  0x006600, 0x009900, 0x00CC00, 0x00FF00, 0x000033, 0x000066,
523  0x000099, 0x0000CC, 0x0000FF, 0x333300, 0x666600, 0x999900,
524  0xCCCC00, 0xFFFF00, 0x003333, 0x006666, 0x009999, 0x00CCCC,
525  0x00FFFF, 0x330033, 0x660066, 0x990099, 0xCC00CC, 0xFF00FF,
526  0xFFFF33, 0xFFFF66, 0xFFFF99, 0xFFFFCC, 0xFF33FF, 0xFF66FF,
527  0xFF99FF, 0xFFCCFF, 0x33FFFF, 0x66FFFF, 0x99FFFF, 0xCCFFFF,
528  0xCCCC33, 0xCCCC66, 0xCCCC99, 0xCCCCFF, 0xCC33CC, 0xCC66CC,
529  0xCC99CC, 0xCCFFCC, 0x33CCCC, 0x66CCCC, 0x99CCCC, 0xFFCCCC,
530  0x999933, 0x999966, 0x9999CC, 0x9999FF, 0x993399, 0x996699,
531  0x99CC99, 0x99FF99, 0x339999, 0x669999, 0xCC9999, 0xFF9999,
532  0x666633, 0x666699, 0x6666CC, 0x6666FF, 0x663366, 0x669966,
533  0x66CC66, 0x66FF66, 0x336666, 0x996666, 0xCC6666, 0xFF6666,
534  0x333366, 0x333399, 0x3333CC, 0x3333FF, 0x336633, 0x339933,
535  0x33CC33, 0x33FF33, 0x663333, 0x993333, 0xCC3333, 0xFF3333,
536  0x003366, 0x336600, 0x660033, 0x006633, 0x330066, 0x663300,
537  0x336699, 0x669933, 0x993366, 0x339966, 0x663399, 0x996633,
538  0x6699CC, 0x99CC66, 0xCC6699, 0x66CC99, 0x9966CC, 0xCC9966,
539  0x99CCFF, 0xCCFF99, 0xFF99CC, 0x99FFCC, 0xCC99FF, 0xFFCC99,
540  0x111111, 0x222222, 0x444444, 0x555555, 0xAAAAAA, 0xBBBBBB,
541  0xDDDDDD, 0xEEEEEE
542 };
543 
544 static av_cold int flashsv2_decode_init(AVCodecContext *avctx)
545 {
547  int ret;
548 
550  if (ret < 0)
551  return ret;
552  s->pal = ff_flashsv2_default_palette;
553  s->ver = 2;
554 
555  return 0;
556 }
557 
558 static av_cold int flashsv2_decode_end(AVCodecContext *avctx)
559 {
561 
562  av_buffer_unref(&s->keyframedata_buf);
563  s->keyframedata = NULL;
564  av_freep(&s->blocks);
565  av_freep(&s->keyframe);
567 
568  return 0;
569 }
570 
572  .p.name = "flashsv2",
573  CODEC_LONG_NAME("Flash Screen Video v2"),
574  .p.type = AVMEDIA_TYPE_VIDEO,
575  .p.id = AV_CODEC_ID_FLASHSV2,
576  .priv_data_size = sizeof(FlashSVContext),
577  .init = flashsv2_decode_init,
578  .close = flashsv2_decode_end,
580  .p.capabilities = AV_CODEC_CAP_DR1,
581  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
582  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
583 };
584 #endif /* CONFIG_FLASHSV2_DECODER */
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:839
r
const char * r
Definition: vf_curves.c:126
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
FlashSVContext::image_width
int image_width
Definition: flashsv.c:57
flashsv_decode_end
static av_cold int flashsv_decode_end(AVCodecContext *avctx)
Definition: flashsv.c:107
FlashSVContext::keyframedata
const uint8_t * keyframedata
Definition: flashsv.c:64
FlashSVContext::zstream
FFZStream zstream
Definition: flashsv.c:71
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
FlashSVContext::pal
const uint32_t * pal
Definition: flashsv.c:62
w
uint8_t w
Definition: llviddspenc.c:38
FlashSVContext::ver
int ver
Definition: flashsv.c:61
AVPacket::data
uint8_t * data
Definition: packet.h:374
b
#define b
Definition: input.c:41
decode_hybrid
static int decode_hybrid(const uint8_t *sptr, const uint8_t *sptr_end, uint8_t *dptr, int dx, int dy, int h, int w, int stride, const uint32_t *pal)
Definition: flashsv.c:75
data
const char data[16]
Definition: mxf.c:146
FFCodec
Definition: codec_internal.h:119
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AVERROR_UNKNOWN
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:73
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:91
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:429
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
flashsv_decode_init
static av_cold int flashsv_decode_init(AVCodecContext *avctx)
Definition: flashsv.c:121
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
flashsv_decode_block
static int flashsv_decode_block(AVCodecContext *avctx, const AVPacket *avpkt, GetBitContext *gb, int block_size, int width, int height, int x_pos, int y_pos, int blk_idx)
Definition: flashsv.c:200
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:123
inflate
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:195
GetBitContext
Definition: get_bits.h:61
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:104
flashsv2_prime
static int flashsv2_prime(FlashSVContext *s, const uint8_t *src, int size)
Definition: flashsv.c:136
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
zlib_wrapper.h
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:667
FlashSVContext::tmpblock
uint8_t * tmpblock
Definition: flashsv.c:59
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:298
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
g
const char * g
Definition: vf_curves.c:127
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
decode.h
get_bits.h
FlashSVContext::is_keyframe
int is_keyframe
Definition: flashsv.c:63
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
FlashSVContext::zlibprime_curr
int zlibprime_curr
Definition: flashsv.c:69
AV_CODEC_ID_FLASHSV2
@ AV_CODEC_ID_FLASHSV2
Definition: codec_id.h:183
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:357
NULL
#define NULL
Definition: coverity.c:32
FlashSVContext::frame
AVFrame * frame
Definition: flashsv.c:56
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
FlashSVContext::color_depth
int color_depth
Definition: flashsv.c:68
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
FlashSVContext
Definition: flashsv.c:54
FlashSVContext::zlibprime_prev
int zlibprime_prev
Definition: flashsv.c:69
AV_CODEC_ID_FLASHSV
@ AV_CODEC_ID_FLASHSV
Definition: codec_id.h:138
BlockInfo::size
int size
Definition: flashsv.c: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
FlashSVContext::keyframedata_buf
AVBufferRef * keyframedata_buf
Definition: flashsv.c:65
BlockInfo
Definition: dvdec.c:56
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
FlashSVContext::blocks
BlockInfo * blocks
Definition: flashsv.c:67
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:353
codec_internal.h
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
size
int size
Definition: twinvq_data.h:10344
av_reallocp
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
Definition: mem.c:186
ff_flashsv2_decoder
const FFCodec ff_flashsv2_decoder
header
static const uint8_t header[24]
Definition: sdr2.c:67
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
height
#define height
FlashSVContext::block_height
int block_height
Definition: flashsv.c:58
line
Definition: graph2dot.c:48
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:380
FlashSVContext::block_width
int block_width
Definition: flashsv.c:58
FlashSVContext::diff_height
int diff_height
Definition: flashsv.c:70
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
FlashSVContext::block_size
int block_size
Definition: flashsv.c:60
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
FlashSVContext::image_height
int image_height
Definition: flashsv.c:57
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:487
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
av_buffer_replace
int av_buffer_replace(AVBufferRef **pdst, const AVBufferRef *src)
Ensure dst refers to the same data as src.
Definition: buffer.c:233
ff_inflate_end
void ff_inflate_end(FFZStream *zstream)
Wrapper around inflateEnd().
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1568
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:398
FlashSVContext::keyframe
uint8_t * keyframe
Definition: flashsv.c:66
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
FlashSVContext::diff_start
int diff_start
Definition: flashsv.c:70
ff_flashsv_decoder
const FFCodec ff_flashsv_decoder
BlockInfo::pos
const uint8_t * pos
Definition: flashsv.c:50
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FFZStream
Definition: zlib_wrapper.h:27
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
ff_inflate_init
int ff_inflate_init(FFZStream *zstream, void *logctx)
Wrapper around inflateInit().
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
bytestream.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
h
h
Definition: vp9dsp_template.c:2038
flashsv_decode_frame
static int flashsv_decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
Definition: flashsv.c:269
FlashSVContext::avctx
AVCodecContext * avctx
Definition: flashsv.c:55
AV_RB16
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_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:98
FlashSVContext::tmp
uint8_t tmp[UINT16_MAX]
Definition: flashsv.c:72