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proresdec2.c
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1 /*
2  * Copyright (c) 2010-2011 Maxim Poliakovski
3  * Copyright (c) 2010-2011 Elvis Presley
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  * Known FOURCCs: 'apch' (HQ), 'apcn' (SD), 'apcs' (LT), 'acpo' (Proxy), 'ap4h' (4444)
25  */
26 
27 //#define DEBUG
28 
29 #define LONG_BITSTREAM_READER
30 
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "idctdsp.h"
34 #include "internal.h"
35 #include "simple_idct.h"
36 #include "proresdec.h"
37 #include "proresdata.h"
38 
39 static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[64])
40 {
41  int i;
42  for (i = 0; i < 64; i++)
43  dst[i] = permutation[src[i]];
44 }
45 
46 static av_cold int decode_init(AVCodecContext *avctx)
47 {
48  ProresContext *ctx = avctx->priv_data;
49  uint8_t idct_permutation[64];
50 
51  avctx->bits_per_raw_sample = 10;
52 
53  ff_dsputil_init(&ctx->dsp, avctx);
54  ff_blockdsp_init(&ctx->bdsp, avctx);
55  ff_proresdsp_init(&ctx->prodsp, avctx);
56 
57  ff_init_scantable_permutation(idct_permutation,
58  ctx->prodsp.idct_permutation_type);
59 
60  permute(ctx->progressive_scan, ff_prores_progressive_scan, idct_permutation);
61  permute(ctx->interlaced_scan, ff_prores_interlaced_scan, idct_permutation);
62 
63  return 0;
64 }
65 
66 static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
67  const int data_size, AVCodecContext *avctx)
68 {
69  int hdr_size, width, height, flags;
70  int version;
71  const uint8_t *ptr;
72 
73  hdr_size = AV_RB16(buf);
74  av_dlog(avctx, "header size %d\n", hdr_size);
75  if (hdr_size > data_size) {
76  av_log(avctx, AV_LOG_ERROR, "error, wrong header size\n");
77  return AVERROR_INVALIDDATA;
78  }
79 
80  version = AV_RB16(buf + 2);
81  av_dlog(avctx, "%.4s version %d\n", buf+4, version);
82  if (version > 1) {
83  av_log(avctx, AV_LOG_ERROR, "unsupported version: %d\n", version);
84  return AVERROR_PATCHWELCOME;
85  }
86 
87  width = AV_RB16(buf + 8);
88  height = AV_RB16(buf + 10);
89  if (width != avctx->width || height != avctx->height) {
90  av_log(avctx, AV_LOG_ERROR, "picture resolution change: %dx%d -> %dx%d\n",
91  avctx->width, avctx->height, width, height);
92  return AVERROR_PATCHWELCOME;
93  }
94 
95  ctx->frame_type = (buf[12] >> 2) & 3;
96  ctx->alpha_info = buf[17] & 0xf;
97 
98  if (ctx->alpha_info > 2) {
99  av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info);
100  return AVERROR_INVALIDDATA;
101  }
102  if (avctx->skip_alpha) ctx->alpha_info = 0;
103 
104  av_dlog(avctx, "frame type %d\n", ctx->frame_type);
105 
106  if (ctx->frame_type == 0) {
107  ctx->scan = ctx->progressive_scan; // permuted
108  } else {
109  ctx->scan = ctx->interlaced_scan; // permuted
110  ctx->frame->interlaced_frame = 1;
111  ctx->frame->top_field_first = ctx->frame_type == 1;
112  }
113 
114  if (ctx->alpha_info) {
115  avctx->pix_fmt = (buf[12] & 0xC0) == 0xC0 ? AV_PIX_FMT_YUVA444P10 : AV_PIX_FMT_YUVA422P10;
116  } else {
117  avctx->pix_fmt = (buf[12] & 0xC0) == 0xC0 ? AV_PIX_FMT_YUV444P10 : AV_PIX_FMT_YUV422P10;
118  }
119 
120  ptr = buf + 20;
121  flags = buf[19];
122  av_dlog(avctx, "flags %x\n", flags);
123 
124  if (flags & 2) {
125  if(buf + data_size - ptr < 64) {
126  av_log(avctx, AV_LOG_ERROR, "Header truncated\n");
127  return AVERROR_INVALIDDATA;
128  }
129  permute(ctx->qmat_luma, ctx->prodsp.idct_permutation, ptr);
130  ptr += 64;
131  } else {
132  memset(ctx->qmat_luma, 4, 64);
133  }
134 
135  if (flags & 1) {
136  if(buf + data_size - ptr < 64) {
137  av_log(avctx, AV_LOG_ERROR, "Header truncated\n");
138  return AVERROR_INVALIDDATA;
139  }
140  permute(ctx->qmat_chroma, ctx->prodsp.idct_permutation, ptr);
141  } else {
142  memset(ctx->qmat_chroma, 4, 64);
143  }
144 
145  return hdr_size;
146 }
147 
148 static int decode_picture_header(AVCodecContext *avctx, const uint8_t *buf, const int buf_size)
149 {
150  ProresContext *ctx = avctx->priv_data;
151  int i, hdr_size, slice_count;
152  unsigned pic_data_size;
153  int log2_slice_mb_width, log2_slice_mb_height;
154  int slice_mb_count, mb_x, mb_y;
155  const uint8_t *data_ptr, *index_ptr;
156 
157  hdr_size = buf[0] >> 3;
158  if (hdr_size < 8 || hdr_size > buf_size) {
159  av_log(avctx, AV_LOG_ERROR, "error, wrong picture header size\n");
160  return AVERROR_INVALIDDATA;
161  }
162 
163  pic_data_size = AV_RB32(buf + 1);
164  if (pic_data_size > buf_size) {
165  av_log(avctx, AV_LOG_ERROR, "error, wrong picture data size\n");
166  return AVERROR_INVALIDDATA;
167  }
168 
169  log2_slice_mb_width = buf[7] >> 4;
170  log2_slice_mb_height = buf[7] & 0xF;
171  if (log2_slice_mb_width > 3 || log2_slice_mb_height) {
172  av_log(avctx, AV_LOG_ERROR, "unsupported slice resolution: %dx%d\n",
173  1 << log2_slice_mb_width, 1 << log2_slice_mb_height);
174  return AVERROR_INVALIDDATA;
175  }
176 
177  ctx->mb_width = (avctx->width + 15) >> 4;
178  if (ctx->frame_type)
179  ctx->mb_height = (avctx->height + 31) >> 5;
180  else
181  ctx->mb_height = (avctx->height + 15) >> 4;
182 
183  slice_count = AV_RB16(buf + 5);
184 
185  if (ctx->slice_count != slice_count || !ctx->slices) {
186  av_freep(&ctx->slices);
187  ctx->slices = av_mallocz_array(slice_count, sizeof(*ctx->slices));
188  if (!ctx->slices)
189  return AVERROR(ENOMEM);
190  ctx->slice_count = slice_count;
191  }
192 
193  if (!slice_count)
194  return AVERROR(EINVAL);
195 
196  if (hdr_size + slice_count*2 > buf_size) {
197  av_log(avctx, AV_LOG_ERROR, "error, wrong slice count\n");
198  return AVERROR_INVALIDDATA;
199  }
200 
201  // parse slice information
202  index_ptr = buf + hdr_size;
203  data_ptr = index_ptr + slice_count*2;
204 
205  slice_mb_count = 1 << log2_slice_mb_width;
206  mb_x = 0;
207  mb_y = 0;
208 
209  for (i = 0; i < slice_count; i++) {
210  SliceContext *slice = &ctx->slices[i];
211 
212  slice->data = data_ptr;
213  data_ptr += AV_RB16(index_ptr + i*2);
214 
215  while (ctx->mb_width - mb_x < slice_mb_count)
216  slice_mb_count >>= 1;
217 
218  slice->mb_x = mb_x;
219  slice->mb_y = mb_y;
220  slice->mb_count = slice_mb_count;
221  slice->data_size = data_ptr - slice->data;
222 
223  if (slice->data_size < 6) {
224  av_log(avctx, AV_LOG_ERROR, "error, wrong slice data size\n");
225  return AVERROR_INVALIDDATA;
226  }
227 
228  mb_x += slice_mb_count;
229  if (mb_x == ctx->mb_width) {
230  slice_mb_count = 1 << log2_slice_mb_width;
231  mb_x = 0;
232  mb_y++;
233  }
234  if (data_ptr > buf + buf_size) {
235  av_log(avctx, AV_LOG_ERROR, "error, slice out of bounds\n");
236  return AVERROR_INVALIDDATA;
237  }
238  }
239 
240  if (mb_x || mb_y != ctx->mb_height) {
241  av_log(avctx, AV_LOG_ERROR, "error wrong mb count y %d h %d\n",
242  mb_y, ctx->mb_height);
243  return AVERROR_INVALIDDATA;
244  }
245 
246  return pic_data_size;
247 }
248 
249 #define DECODE_CODEWORD(val, codebook) \
250  do { \
251  unsigned int rice_order, exp_order, switch_bits; \
252  unsigned int q, buf, bits; \
253  \
254  UPDATE_CACHE(re, gb); \
255  buf = GET_CACHE(re, gb); \
256  \
257  /* number of bits to switch between rice and exp golomb */ \
258  switch_bits = codebook & 3; \
259  rice_order = codebook >> 5; \
260  exp_order = (codebook >> 2) & 7; \
261  \
262  q = 31 - av_log2(buf); \
263  \
264  if (q > switch_bits) { /* exp golomb */ \
265  bits = exp_order - switch_bits + (q<<1); \
266  val = SHOW_UBITS(re, gb, bits) - (1 << exp_order) + \
267  ((switch_bits + 1) << rice_order); \
268  SKIP_BITS(re, gb, bits); \
269  } else if (rice_order) { \
270  SKIP_BITS(re, gb, q+1); \
271  val = (q << rice_order) + SHOW_UBITS(re, gb, rice_order); \
272  SKIP_BITS(re, gb, rice_order); \
273  } else { \
274  val = q; \
275  SKIP_BITS(re, gb, q+1); \
276  } \
277  } while (0)
278 
279 #define TOSIGNED(x) (((x) >> 1) ^ (-((x) & 1)))
280 
281 #define FIRST_DC_CB 0xB8
282 
283 static const uint8_t dc_codebook[7] = { 0x04, 0x28, 0x28, 0x4D, 0x4D, 0x70, 0x70};
284 
285 static av_always_inline void decode_dc_coeffs(GetBitContext *gb, int16_t *out,
286  int blocks_per_slice)
287 {
288  int16_t prev_dc;
289  int code, i, sign;
290 
291  OPEN_READER(re, gb);
292 
293  DECODE_CODEWORD(code, FIRST_DC_CB);
294  prev_dc = TOSIGNED(code);
295  out[0] = prev_dc;
296 
297  out += 64; // dc coeff for the next block
298 
299  code = 5;
300  sign = 0;
301  for (i = 1; i < blocks_per_slice; i++, out += 64) {
302  DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6U)]);
303  if(code) sign ^= -(code & 1);
304  else sign = 0;
305  prev_dc += (((code + 1) >> 1) ^ sign) - sign;
306  out[0] = prev_dc;
307  }
308  CLOSE_READER(re, gb);
309 }
310 
311 // adaptive codebook switching lut according to previous run/level values
312 static const uint8_t run_to_cb[16] = { 0x06, 0x06, 0x05, 0x05, 0x04, 0x29, 0x29, 0x29, 0x29, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x4C };
313 static const uint8_t lev_to_cb[10] = { 0x04, 0x0A, 0x05, 0x06, 0x04, 0x28, 0x28, 0x28, 0x28, 0x4C };
314 
315 static av_always_inline int decode_ac_coeffs(AVCodecContext *avctx, GetBitContext *gb,
316  int16_t *out, int blocks_per_slice)
317 {
318  ProresContext *ctx = avctx->priv_data;
319  int block_mask, sign;
320  unsigned pos, run, level;
321  int max_coeffs, i, bits_left;
322  int log2_block_count = av_log2(blocks_per_slice);
323 
324  OPEN_READER(re, gb);
325  UPDATE_CACHE(re, gb); \
326  run = 4;
327  level = 2;
328 
329  max_coeffs = 64 << log2_block_count;
330  block_mask = blocks_per_slice - 1;
331 
332  for (pos = block_mask;;) {
333  bits_left = gb->size_in_bits - re_index;
334  if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
335  break;
336 
337  DECODE_CODEWORD(run, run_to_cb[FFMIN(run, 15)]);
338  pos += run + 1;
339  if (pos >= max_coeffs) {
340  av_log(avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", pos, max_coeffs);
341  return AVERROR_INVALIDDATA;
342  }
343 
344  DECODE_CODEWORD(level, lev_to_cb[FFMIN(level, 9)]);
345  level += 1;
346 
347  i = pos >> log2_block_count;
348 
349  sign = SHOW_SBITS(re, gb, 1);
350  SKIP_BITS(re, gb, 1);
351  out[((pos & block_mask) << 6) + ctx->scan[i]] = ((level ^ sign) - sign);
352  }
353 
354  CLOSE_READER(re, gb);
355  return 0;
356 }
357 
358 static int decode_slice_luma(AVCodecContext *avctx, SliceContext *slice,
359  uint16_t *dst, int dst_stride,
360  const uint8_t *buf, unsigned buf_size,
361  const int16_t *qmat)
362 {
363  ProresContext *ctx = avctx->priv_data;
364  LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
365  int16_t *block;
366  GetBitContext gb;
367  int i, blocks_per_slice = slice->mb_count<<2;
368  int ret;
369 
370  for (i = 0; i < blocks_per_slice; i++)
371  ctx->bdsp.clear_block(blocks+(i<<6));
372 
373  init_get_bits(&gb, buf, buf_size << 3);
374 
375  decode_dc_coeffs(&gb, blocks, blocks_per_slice);
376  if ((ret = decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice)) < 0)
377  return ret;
378 
379  block = blocks;
380  for (i = 0; i < slice->mb_count; i++) {
381  ctx->prodsp.idct_put(dst, dst_stride, block+(0<<6), qmat);
382  ctx->prodsp.idct_put(dst +8, dst_stride, block+(1<<6), qmat);
383  ctx->prodsp.idct_put(dst+4*dst_stride , dst_stride, block+(2<<6), qmat);
384  ctx->prodsp.idct_put(dst+4*dst_stride+8, dst_stride, block+(3<<6), qmat);
385  block += 4*64;
386  dst += 16;
387  }
388  return 0;
389 }
390 
391 static int decode_slice_chroma(AVCodecContext *avctx, SliceContext *slice,
392  uint16_t *dst, int dst_stride,
393  const uint8_t *buf, unsigned buf_size,
394  const int16_t *qmat, int log2_blocks_per_mb)
395 {
396  ProresContext *ctx = avctx->priv_data;
397  LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
398  int16_t *block;
399  GetBitContext gb;
400  int i, j, blocks_per_slice = slice->mb_count << log2_blocks_per_mb;
401  int ret;
402 
403  for (i = 0; i < blocks_per_slice; i++)
404  ctx->bdsp.clear_block(blocks+(i<<6));
405 
406  init_get_bits(&gb, buf, buf_size << 3);
407 
408  decode_dc_coeffs(&gb, blocks, blocks_per_slice);
409  if ((ret = decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice)) < 0)
410  return ret;
411 
412  block = blocks;
413  for (i = 0; i < slice->mb_count; i++) {
414  for (j = 0; j < log2_blocks_per_mb; j++) {
415  ctx->prodsp.idct_put(dst, dst_stride, block+(0<<6), qmat);
416  ctx->prodsp.idct_put(dst+4*dst_stride, dst_stride, block+(1<<6), qmat);
417  block += 2*64;
418  dst += 8;
419  }
420  }
421  return 0;
422 }
423 
424 static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
425  const int num_bits)
426 {
427  const int mask = (1 << num_bits) - 1;
428  int i, idx, val, alpha_val;
429 
430  idx = 0;
431  alpha_val = mask;
432  do {
433  do {
434  if (get_bits1(gb)) {
435  val = get_bits(gb, num_bits);
436  } else {
437  int sign;
438  val = get_bits(gb, num_bits == 16 ? 7 : 4);
439  sign = val & 1;
440  val = (val + 2) >> 1;
441  if (sign)
442  val = -val;
443  }
444  alpha_val = (alpha_val + val) & mask;
445  if (num_bits == 16) {
446  dst[idx++] = alpha_val >> 6;
447  } else {
448  dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
449  }
450  if (idx >= num_coeffs)
451  break;
452  } while (get_bits_left(gb)>0 && get_bits1(gb));
453  val = get_bits(gb, 4);
454  if (!val)
455  val = get_bits(gb, 11);
456  if (idx + val > num_coeffs)
457  val = num_coeffs - idx;
458  if (num_bits == 16) {
459  for (i = 0; i < val; i++)
460  dst[idx++] = alpha_val >> 6;
461  } else {
462  for (i = 0; i < val; i++)
463  dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
464 
465  }
466  } while (idx < num_coeffs);
467 }
468 
469 /**
470  * Decode alpha slice plane.
471  */
472 static void decode_slice_alpha(ProresContext *ctx,
473  uint16_t *dst, int dst_stride,
474  const uint8_t *buf, int buf_size,
475  int blocks_per_slice)
476 {
477  GetBitContext gb;
478  int i;
479  LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
480  int16_t *block;
481 
482  for (i = 0; i < blocks_per_slice<<2; i++)
483  ctx->bdsp.clear_block(blocks+(i<<6));
484 
485  init_get_bits(&gb, buf, buf_size << 3);
486 
487  if (ctx->alpha_info == 2) {
488  unpack_alpha(&gb, blocks, blocks_per_slice * 4 * 64, 16);
489  } else {
490  unpack_alpha(&gb, blocks, blocks_per_slice * 4 * 64, 8);
491  }
492 
493  block = blocks;
494  for (i = 0; i < 16; i++) {
495  memcpy(dst, block, 16 * blocks_per_slice * sizeof(*dst));
496  dst += dst_stride >> 1;
497  block += 16 * blocks_per_slice;
498  }
499 }
500 
501 static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)
502 {
503  ProresContext *ctx = avctx->priv_data;
504  SliceContext *slice = &ctx->slices[jobnr];
505  const uint8_t *buf = slice->data;
506  AVFrame *pic = ctx->frame;
507  int i, hdr_size, qscale, log2_chroma_blocks_per_mb;
508  int luma_stride, chroma_stride;
509  int y_data_size, u_data_size, v_data_size, a_data_size;
510  uint8_t *dest_y, *dest_u, *dest_v, *dest_a;
511  int16_t qmat_luma_scaled[64];
512  int16_t qmat_chroma_scaled[64];
513  int mb_x_shift;
514  int ret;
515 
516  slice->ret = -1;
517  //av_log(avctx, AV_LOG_INFO, "slice %d mb width %d mb x %d y %d\n",
518  // jobnr, slice->mb_count, slice->mb_x, slice->mb_y);
519 
520  // slice header
521  hdr_size = buf[0] >> 3;
522  qscale = av_clip(buf[1], 1, 224);
523  qscale = qscale > 128 ? qscale - 96 << 2: qscale;
524  y_data_size = AV_RB16(buf + 2);
525  u_data_size = AV_RB16(buf + 4);
526  v_data_size = slice->data_size - y_data_size - u_data_size - hdr_size;
527  if (hdr_size > 7) v_data_size = AV_RB16(buf + 6);
528  a_data_size = slice->data_size - y_data_size - u_data_size -
529  v_data_size - hdr_size;
530 
531  if (y_data_size < 0 || u_data_size < 0 || v_data_size < 0
532  || hdr_size+y_data_size+u_data_size+v_data_size > slice->data_size){
533  av_log(avctx, AV_LOG_ERROR, "invalid plane data size\n");
534  return AVERROR_INVALIDDATA;
535  }
536 
537  buf += hdr_size;
538 
539  for (i = 0; i < 64; i++) {
540  qmat_luma_scaled [i] = ctx->qmat_luma [i] * qscale;
541  qmat_chroma_scaled[i] = ctx->qmat_chroma[i] * qscale;
542  }
543 
544  if (ctx->frame_type == 0) {
545  luma_stride = pic->linesize[0];
546  chroma_stride = pic->linesize[1];
547  } else {
548  luma_stride = pic->linesize[0] << 1;
549  chroma_stride = pic->linesize[1] << 1;
550  }
551 
552  if (avctx->pix_fmt == AV_PIX_FMT_YUV444P10 || avctx->pix_fmt == AV_PIX_FMT_YUVA444P10) {
553  mb_x_shift = 5;
554  log2_chroma_blocks_per_mb = 2;
555  } else {
556  mb_x_shift = 4;
557  log2_chroma_blocks_per_mb = 1;
558  }
559 
560  dest_y = pic->data[0] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
561  dest_u = pic->data[1] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << mb_x_shift);
562  dest_v = pic->data[2] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << mb_x_shift);
563  dest_a = pic->data[3] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
564 
565  if (ctx->frame_type && ctx->first_field ^ ctx->frame->top_field_first) {
566  dest_y += pic->linesize[0];
567  dest_u += pic->linesize[1];
568  dest_v += pic->linesize[2];
569  dest_a += pic->linesize[3];
570  }
571 
572  ret = decode_slice_luma(avctx, slice, (uint16_t*)dest_y, luma_stride,
573  buf, y_data_size, qmat_luma_scaled);
574  if (ret < 0)
575  return ret;
576 
577  if (!(avctx->flags & CODEC_FLAG_GRAY)) {
578  ret = decode_slice_chroma(avctx, slice, (uint16_t*)dest_u, chroma_stride,
579  buf + y_data_size, u_data_size,
580  qmat_chroma_scaled, log2_chroma_blocks_per_mb);
581  if (ret < 0)
582  return ret;
583 
584  ret = decode_slice_chroma(avctx, slice, (uint16_t*)dest_v, chroma_stride,
585  buf + y_data_size + u_data_size, v_data_size,
586  qmat_chroma_scaled, log2_chroma_blocks_per_mb);
587  if (ret < 0)
588  return ret;
589  }
590  /* decode alpha plane if available */
591  if (ctx->alpha_info && pic->data[3] && a_data_size)
592  decode_slice_alpha(ctx, (uint16_t*)dest_a, luma_stride,
593  buf + y_data_size + u_data_size + v_data_size,
594  a_data_size, slice->mb_count);
595 
596  slice->ret = 0;
597  return 0;
598 }
599 
600 static int decode_picture(AVCodecContext *avctx)
601 {
602  ProresContext *ctx = avctx->priv_data;
603  int i;
604 
605  avctx->execute2(avctx, decode_slice_thread, NULL, NULL, ctx->slice_count);
606 
607  for (i = 0; i < ctx->slice_count; i++)
608  if (ctx->slices[i].ret < 0)
609  return ctx->slices[i].ret;
610 
611  return 0;
612 }
613 
614 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
615  AVPacket *avpkt)
616 {
617  ProresContext *ctx = avctx->priv_data;
618  AVFrame *frame = data;
619  const uint8_t *buf = avpkt->data;
620  int buf_size = avpkt->size;
621  int frame_hdr_size, pic_size, ret;
622 
623  if (buf_size < 28 || AV_RL32(buf + 4) != AV_RL32("icpf")) {
624  av_log(avctx, AV_LOG_ERROR, "invalid frame header\n");
625  return AVERROR_INVALIDDATA;
626  }
627 
628  ctx->frame = frame;
629  ctx->frame->pict_type = AV_PICTURE_TYPE_I;
630  ctx->frame->key_frame = 1;
631  ctx->first_field = 1;
632 
633  buf += 8;
634  buf_size -= 8;
635 
636  frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx);
637  if (frame_hdr_size < 0)
638  return frame_hdr_size;
639 
640  buf += frame_hdr_size;
641  buf_size -= frame_hdr_size;
642 
643  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
644  return ret;
645 
646  decode_picture:
647  pic_size = decode_picture_header(avctx, buf, buf_size);
648  if (pic_size < 0) {
649  av_log(avctx, AV_LOG_ERROR, "error decoding picture header\n");
650  return pic_size;
651  }
652 
653  if ((ret = decode_picture(avctx)) < 0) {
654  av_log(avctx, AV_LOG_ERROR, "error decoding picture\n");
655  return ret;
656  }
657 
658  buf += pic_size;
659  buf_size -= pic_size;
660 
661  if (ctx->frame_type && buf_size > 0 && ctx->first_field) {
662  ctx->first_field = 0;
663  goto decode_picture;
664  }
665 
666  *got_frame = 1;
667 
668  return avpkt->size;
669 }
670 
671 static av_cold int decode_close(AVCodecContext *avctx)
672 {
673  ProresContext *ctx = avctx->priv_data;
674 
675  av_freep(&ctx->slices);
676 
677  return 0;
678 }
679 
680 AVCodec ff_prores_decoder = {
681  .name = "prores",
682  .long_name = NULL_IF_CONFIG_SMALL("ProRes"),
683  .type = AVMEDIA_TYPE_VIDEO,
684  .id = AV_CODEC_ID_PRORES,
685  .priv_data_size = sizeof(ProresContext),
686  .init = decode_init,
687  .close = decode_close,
688  .decode = decode_frame,
689  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
690 };
Generated on Sun Jul 20 2014 23:05:53 for FFmpeg by   doxygen 1.8.2