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qtrle.c
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1 /*
2  * Quicktime Animation (RLE) Video Decoder
3  * Copyright (C) 2004 The FFmpeg project
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
25  * For more information about the QT RLE format, visit:
26  * http://www.pcisys.net/~melanson/codecs/
27  *
28  * The QT RLE decoder has seven modes of operation:
29  * 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8
30  * the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555
31  * data. 24-bit data is RGB24 and 32-bit data is RGB32.
32  */
33 
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 
38 #include "avcodec.h"
39 #include "bytestream.h"
40 #include "internal.h"
41 
42 typedef struct QtrleContext {
45 
47  uint32_t pal[256];
48 } QtrleContext;
49 
50 #define CHECK_PIXEL_PTR(n) \
51  if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
52  av_log (s->avctx, AV_LOG_ERROR, "Problem: pixel_ptr = %d, pixel_limit = %d\n",\
53  pixel_ptr + n, pixel_limit); \
54  return; \
55  } \
56 
57 static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)
58 {
59  int rle_code;
60  int pixel_ptr;
61  int row_inc = s->frame->linesize[0];
62  uint8_t pi0, pi1; /* 2 8-pixel values */
63  uint8_t *rgb = s->frame->data[0];
64  int pixel_limit = s->frame->linesize[0] * s->avctx->height;
65  int skip;
66  /* skip & 0x80 appears to mean 'start a new line', which can be interpreted
67  * as 'go to next line' during the decoding of a frame but is 'go to first
68  * line' at the beginning. Since we always interpret it as 'go to next line'
69  * in the decoding loop (which makes code simpler/faster), the first line
70  * would not be counted, so we count one more.
71  * See: https://trac.ffmpeg.org/ticket/226
72  * In the following decoding loop, row_ptr will be the position of the
73  * current row. */
74 
75  row_ptr -= row_inc;
76  pixel_ptr = row_ptr;
77  lines_to_change++;
78  while (lines_to_change) {
79  skip = bytestream2_get_byte(&s->g);
80  rle_code = (int8_t)bytestream2_get_byte(&s->g);
81  if (rle_code == 0)
82  break;
83  if(skip & 0x80) {
84  lines_to_change--;
85  row_ptr += row_inc;
86  pixel_ptr = row_ptr + 2 * 8 * (skip & 0x7f);
87  } else
88  pixel_ptr += 2 * 8 * skip;
89  CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
90 
91  if(rle_code == -1)
92  continue;
93 
94  if (rle_code < 0) {
95  /* decode the run length code */
96  rle_code = -rle_code;
97  /* get the next 2 bytes from the stream, treat them as groups
98  * of 8 pixels, and output them rle_code times */
99 
100  pi0 = bytestream2_get_byte(&s->g);
101  pi1 = bytestream2_get_byte(&s->g);
102  CHECK_PIXEL_PTR(rle_code * 2 * 8);
103 
104  while (rle_code--) {
105  rgb[pixel_ptr++] = (pi0 >> 7) & 0x01;
106  rgb[pixel_ptr++] = (pi0 >> 6) & 0x01;
107  rgb[pixel_ptr++] = (pi0 >> 5) & 0x01;
108  rgb[pixel_ptr++] = (pi0 >> 4) & 0x01;
109  rgb[pixel_ptr++] = (pi0 >> 3) & 0x01;
110  rgb[pixel_ptr++] = (pi0 >> 2) & 0x01;
111  rgb[pixel_ptr++] = (pi0 >> 1) & 0x01;
112  rgb[pixel_ptr++] = pi0 & 0x01;
113  rgb[pixel_ptr++] = (pi1 >> 7) & 0x01;
114  rgb[pixel_ptr++] = (pi1 >> 6) & 0x01;
115  rgb[pixel_ptr++] = (pi1 >> 5) & 0x01;
116  rgb[pixel_ptr++] = (pi1 >> 4) & 0x01;
117  rgb[pixel_ptr++] = (pi1 >> 3) & 0x01;
118  rgb[pixel_ptr++] = (pi1 >> 2) & 0x01;
119  rgb[pixel_ptr++] = (pi1 >> 1) & 0x01;
120  rgb[pixel_ptr++] = pi1 & 0x01;
121  }
122  } else {
123  /* copy the same pixel directly to output 2 times */
124  rle_code *= 2;
125  CHECK_PIXEL_PTR(rle_code * 8);
126 
127  while (rle_code--) {
128  int x = bytestream2_get_byte(&s->g);
129  rgb[pixel_ptr++] = (x >> 7) & 0x01;
130  rgb[pixel_ptr++] = (x >> 6) & 0x01;
131  rgb[pixel_ptr++] = (x >> 5) & 0x01;
132  rgb[pixel_ptr++] = (x >> 4) & 0x01;
133  rgb[pixel_ptr++] = (x >> 3) & 0x01;
134  rgb[pixel_ptr++] = (x >> 2) & 0x01;
135  rgb[pixel_ptr++] = (x >> 1) & 0x01;
136  rgb[pixel_ptr++] = x & 0x01;
137  }
138  }
139  }
140 }
141 
142 static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr,
143  int lines_to_change, int bpp)
144 {
145  int rle_code, i;
146  int pixel_ptr;
147  int row_inc = s->frame->linesize[0];
148  uint8_t pi[16]; /* 16 palette indices */
149  uint8_t *rgb = s->frame->data[0];
150  int pixel_limit = s->frame->linesize[0] * s->avctx->height;
151  int num_pixels = (bpp == 4) ? 8 : 16;
152 
153  while (lines_to_change--) {
154  pixel_ptr = row_ptr + (num_pixels * (bytestream2_get_byte(&s->g) - 1));
155  CHECK_PIXEL_PTR(0);
156 
157  while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
158  if (rle_code == 0) {
159  /* there's another skip code in the stream */
160  pixel_ptr += (num_pixels * (bytestream2_get_byte(&s->g) - 1));
161  CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
162  } else if (rle_code < 0) {
163  /* decode the run length code */
164  rle_code = -rle_code;
165  /* get the next 4 bytes from the stream, treat them as palette
166  * indexes, and output them rle_code times */
167  for (i = num_pixels-1; i >= 0; i--) {
168  pi[num_pixels-1-i] = (bytestream2_peek_byte(&s->g) >> ((i*bpp) & 0x07)) & ((1<<bpp)-1);
169  bytestream2_skip(&s->g, ((i & ((num_pixels>>2)-1)) == 0));
170  }
171  CHECK_PIXEL_PTR(rle_code * num_pixels);
172  while (rle_code--) {
173  memcpy(&rgb[pixel_ptr], &pi, num_pixels);
174  pixel_ptr += num_pixels;
175  }
176  } else {
177  /* copy the same pixel directly to output 4 times */
178  rle_code *= 4;
179  CHECK_PIXEL_PTR(rle_code*(num_pixels>>2));
180  while (rle_code--) {
181  if(bpp == 4) {
182  int x = bytestream2_get_byte(&s->g);
183  rgb[pixel_ptr++] = (x >> 4) & 0x0f;
184  rgb[pixel_ptr++] = x & 0x0f;
185  } else {
186  int x = bytestream2_get_byte(&s->g);
187  rgb[pixel_ptr++] = (x >> 6) & 0x03;
188  rgb[pixel_ptr++] = (x >> 4) & 0x03;
189  rgb[pixel_ptr++] = (x >> 2) & 0x03;
190  rgb[pixel_ptr++] = x & 0x03;
191  }
192  }
193  }
194  }
195  row_ptr += row_inc;
196  }
197 }
198 
199 static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)
200 {
201  int rle_code;
202  int pixel_ptr;
203  int row_inc = s->frame->linesize[0];
204  uint8_t pi1, pi2, pi3, pi4; /* 4 palette indexes */
205  uint8_t *rgb = s->frame->data[0];
206  int pixel_limit = s->frame->linesize[0] * s->avctx->height;
207 
208  while (lines_to_change--) {
209  pixel_ptr = row_ptr + (4 * (bytestream2_get_byte(&s->g) - 1));
210  CHECK_PIXEL_PTR(0);
211 
212  while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
213  if (rle_code == 0) {
214  /* there's another skip code in the stream */
215  pixel_ptr += (4 * (bytestream2_get_byte(&s->g) - 1));
216  CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
217  } else if (rle_code < 0) {
218  /* decode the run length code */
219  rle_code = -rle_code;
220  /* get the next 4 bytes from the stream, treat them as palette
221  * indexes, and output them rle_code times */
222  pi1 = bytestream2_get_byte(&s->g);
223  pi2 = bytestream2_get_byte(&s->g);
224  pi3 = bytestream2_get_byte(&s->g);
225  pi4 = bytestream2_get_byte(&s->g);
226 
227  CHECK_PIXEL_PTR(rle_code * 4);
228 
229  while (rle_code--) {
230  rgb[pixel_ptr++] = pi1;
231  rgb[pixel_ptr++] = pi2;
232  rgb[pixel_ptr++] = pi3;
233  rgb[pixel_ptr++] = pi4;
234  }
235  } else {
236  /* copy the same pixel directly to output 4 times */
237  rle_code *= 4;
238  CHECK_PIXEL_PTR(rle_code);
239 
240  bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code);
241  pixel_ptr += rle_code;
242  }
243  }
244  row_ptr += row_inc;
245  }
246 }
247 
248 static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change)
249 {
250  int rle_code;
251  int pixel_ptr;
252  int row_inc = s->frame->linesize[0];
253  uint16_t rgb16;
254  uint8_t *rgb = s->frame->data[0];
255  int pixel_limit = s->frame->linesize[0] * s->avctx->height;
256 
257  while (lines_to_change--) {
258  pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 2;
259  CHECK_PIXEL_PTR(0);
260 
261  while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
262  if (rle_code == 0) {
263  /* there's another skip code in the stream */
264  pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 2;
265  CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
266  } else if (rle_code < 0) {
267  /* decode the run length code */
268  rle_code = -rle_code;
269  rgb16 = bytestream2_get_be16(&s->g);
270 
271  CHECK_PIXEL_PTR(rle_code * 2);
272 
273  while (rle_code--) {
274  *(uint16_t *)(&rgb[pixel_ptr]) = rgb16;
275  pixel_ptr += 2;
276  }
277  } else {
278  CHECK_PIXEL_PTR(rle_code * 2);
279 
280  /* copy pixels directly to output */
281  while (rle_code--) {
282  rgb16 = bytestream2_get_be16(&s->g);
283  *(uint16_t *)(&rgb[pixel_ptr]) = rgb16;
284  pixel_ptr += 2;
285  }
286  }
287  }
288  row_ptr += row_inc;
289  }
290 }
291 
292 static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change)
293 {
294  int rle_code;
295  int pixel_ptr;
296  int row_inc = s->frame->linesize[0];
297  uint8_t r, g, b;
298  uint8_t *rgb = s->frame->data[0];
299  int pixel_limit = s->frame->linesize[0] * s->avctx->height;
300 
301  while (lines_to_change--) {
302  pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 3;
303  CHECK_PIXEL_PTR(0);
304 
305  while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
306  if (rle_code == 0) {
307  /* there's another skip code in the stream */
308  pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 3;
309  CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
310  } else if (rle_code < 0) {
311  /* decode the run length code */
312  rle_code = -rle_code;
313  r = bytestream2_get_byte(&s->g);
314  g = bytestream2_get_byte(&s->g);
315  b = bytestream2_get_byte(&s->g);
316 
317  CHECK_PIXEL_PTR(rle_code * 3);
318 
319  while (rle_code--) {
320  rgb[pixel_ptr++] = r;
321  rgb[pixel_ptr++] = g;
322  rgb[pixel_ptr++] = b;
323  }
324  } else {
325  CHECK_PIXEL_PTR(rle_code * 3);
326 
327  /* copy pixels directly to output */
328  while (rle_code--) {
329  rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);
330  rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);
331  rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);
332  }
333  }
334  }
335  row_ptr += row_inc;
336  }
337 }
338 
339 static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change)
340 {
341  int rle_code;
342  int pixel_ptr;
343  int row_inc = s->frame->linesize[0];
344  unsigned int argb;
345  uint8_t *rgb = s->frame->data[0];
346  int pixel_limit = s->frame->linesize[0] * s->avctx->height;
347 
348  while (lines_to_change--) {
349  pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 4;
350  CHECK_PIXEL_PTR(0);
351 
352  while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
353  if (rle_code == 0) {
354  /* there's another skip code in the stream */
355  pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 4;
356  CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
357  } else if (rle_code < 0) {
358  /* decode the run length code */
359  rle_code = -rle_code;
360  argb = bytestream2_get_be32(&s->g);
361 
362  CHECK_PIXEL_PTR(rle_code * 4);
363 
364  while (rle_code--) {
365  AV_WN32A(rgb + pixel_ptr, argb);
366  pixel_ptr += 4;
367  }
368  } else {
369  CHECK_PIXEL_PTR(rle_code * 4);
370 
371  /* copy pixels directly to output */
372  while (rle_code--) {
373  argb = bytestream2_get_be32(&s->g);
374  AV_WN32A(rgb + pixel_ptr, argb);
375  pixel_ptr += 4;
376  }
377  }
378  }
379  row_ptr += row_inc;
380  }
381 }
382 
384 {
385  QtrleContext *s = avctx->priv_data;
386 
387  s->avctx = avctx;
388  switch (avctx->bits_per_coded_sample) {
389  case 1:
390  case 2:
391  case 4:
392  case 8:
393  case 33:
394  case 34:
395  case 36:
396  case 40:
397  avctx->pix_fmt = AV_PIX_FMT_PAL8;
398  break;
399 
400  case 16:
401  avctx->pix_fmt = AV_PIX_FMT_RGB555;
402  break;
403 
404  case 24:
405  avctx->pix_fmt = AV_PIX_FMT_RGB24;
406  break;
407 
408  case 32:
409  avctx->pix_fmt = AV_PIX_FMT_RGB32;
410  break;
411 
412  default:
413  av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
414  avctx->bits_per_coded_sample);
415  return AVERROR_INVALIDDATA;
416  }
417 
418  s->frame = av_frame_alloc();
419  if (!s->frame)
420  return AVERROR(ENOMEM);
421 
422  return 0;
423 }
424 
426  void *data, int *got_frame,
427  AVPacket *avpkt)
428 {
429  QtrleContext *s = avctx->priv_data;
430  int header, start_line;
431  int height, row_ptr;
432  int has_palette = 0;
433  int ret;
434 
435  bytestream2_init(&s->g, avpkt->data, avpkt->size);
436  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
437  return ret;
438 
439  /* check if this frame is even supposed to change */
440  if (avpkt->size < 8)
441  goto done;
442 
443  /* start after the chunk size */
444  bytestream2_seek(&s->g, 4, SEEK_SET);
445 
446  /* fetch the header */
447  header = bytestream2_get_be16(&s->g);
448 
449  /* if a header is present, fetch additional decoding parameters */
450  if (header & 0x0008) {
451  if (avpkt->size < 14)
452  goto done;
453  start_line = bytestream2_get_be16(&s->g);
454  bytestream2_skip(&s->g, 2);
455  height = bytestream2_get_be16(&s->g);
456  bytestream2_skip(&s->g, 2);
457  if (height > s->avctx->height - start_line)
458  goto done;
459  } else {
460  start_line = 0;
461  height = s->avctx->height;
462  }
463  row_ptr = s->frame->linesize[0] * start_line;
464 
465  switch (avctx->bits_per_coded_sample) {
466  case 1:
467  case 33:
468  qtrle_decode_1bpp(s, row_ptr, height);
469  has_palette = 1;
470  break;
471 
472  case 2:
473  case 34:
474  qtrle_decode_2n4bpp(s, row_ptr, height, 2);
475  has_palette = 1;
476  break;
477 
478  case 4:
479  case 36:
480  qtrle_decode_2n4bpp(s, row_ptr, height, 4);
481  has_palette = 1;
482  break;
483 
484  case 8:
485  case 40:
486  qtrle_decode_8bpp(s, row_ptr, height);
487  has_palette = 1;
488  break;
489 
490  case 16:
491  qtrle_decode_16bpp(s, row_ptr, height);
492  break;
493 
494  case 24:
495  qtrle_decode_24bpp(s, row_ptr, height);
496  break;
497 
498  case 32:
499  qtrle_decode_32bpp(s, row_ptr, height);
500  break;
501 
502  default:
503  av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
504  avctx->bits_per_coded_sample);
505  break;
506  }
507 
508  if(has_palette) {
509  int size;
510  const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
511 
512  if (pal && size == AVPALETTE_SIZE) {
513  s->frame->palette_has_changed = 1;
514  memcpy(s->pal, pal, AVPALETTE_SIZE);
515  } else if (pal) {
516  av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
517  }
518 
519  /* make the palette available on the way out */
520  memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
521  }
522 
523 done:
524  if ((ret = av_frame_ref(data, s->frame)) < 0)
525  return ret;
526  *got_frame = 1;
527 
528  /* always report that the buffer was completely consumed */
529  return avpkt->size;
530 }
531 
533 {
534  QtrleContext *s = avctx->priv_data;
535 
536  av_frame_free(&s->frame);
537 
538  return 0;
539 }
540 
542  .name = "qtrle",
543  .long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),
544  .type = AVMEDIA_TYPE_VIDEO,
545  .id = AV_CODEC_ID_QTRLE,
546  .priv_data_size = sizeof(QtrleContext),
548  .close = qtrle_decode_end,
550  .capabilities = AV_CODEC_CAP_DR1,
551 };
static void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr, int lines_to_change, int bpp)
Definition: qtrle.c:142
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
GetByteContext g
Definition: qtrle.c:46
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:64
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVFrame * frame
Definition: qtrle.c:44
int size
Definition: avcodec.h:1602
const char * b
Definition: vf_curves.c:113
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1904
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
AVCodec.
Definition: avcodec.h:3601
#define AV_WN32A(p, v)
Definition: intreadwrite.h:538
uint8_t
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:145
static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change)
Definition: qtrle.c:292
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
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:385
AVCodecContext * avctx
Definition: qtrle.c:43
#define height
uint8_t * data
Definition: avcodec.h:1601
static av_cold int qtrle_decode_init(AVCodecContext *avctx)
Definition: qtrle.c:383
static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)
Definition: qtrle.c:57
ptrdiff_t size
Definition: opengl_enc.c:101
static const uint8_t header[24]
Definition: sdr2.c:67
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3071
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:158
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:111
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:263
const char * name
Name of the codec implementation.
Definition: avcodec.h:3608
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:996
static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)
Definition: qtrle.c:199
uint32_t pal[256]
Definition: qtrle.c:47
#define CHECK_PIXEL_PTR(n)
Definition: qtrle.c:50
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
main external API structure.
Definition: avcodec.h:1676
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:326
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:332
static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change)
Definition: qtrle.c:339
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
common internal api header.
static int qtrle_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: qtrle.c:425
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:339
void * priv_data
Definition: avcodec.h:1718
AVCodec ff_qtrle_decoder
Definition: qtrle.c:541
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:208
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:339
static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change)
Definition: qtrle.c:248
static av_cold int qtrle_decode_end(AVCodecContext *avctx)
Definition: qtrle.c:532
This structure stores compressed data.
Definition: avcodec.h:1578
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959