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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 "internal.h"
34 #include "simple_idct.h"
35 #include "proresdec.h"
36 
37 static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[64])
38 {
39  int i;
40  for (i = 0; i < 64; i++)
41  dst[i] = permutation[src[i]];
42 }
43 
44 static const uint8_t progressive_scan[64] = {
45  0, 1, 8, 9, 2, 3, 10, 11,
46  16, 17, 24, 25, 18, 19, 26, 27,
47  4, 5, 12, 20, 13, 6, 7, 14,
48  21, 28, 29, 22, 15, 23, 30, 31,
49  32, 33, 40, 48, 41, 34, 35, 42,
50  49, 56, 57, 50, 43, 36, 37, 44,
51  51, 58, 59, 52, 45, 38, 39, 46,
52  53, 60, 61, 54, 47, 55, 62, 63
53 };
54 
55 static const uint8_t interlaced_scan[64] = {
56  0, 8, 1, 9, 16, 24, 17, 25,
57  2, 10, 3, 11, 18, 26, 19, 27,
58  32, 40, 33, 34, 41, 48, 56, 49,
59  42, 35, 43, 50, 57, 58, 51, 59,
60  4, 12, 5, 6, 13, 20, 28, 21,
61  14, 7, 15, 22, 29, 36, 44, 37,
62  30, 23, 31, 38, 45, 52, 60, 53,
63  46, 39, 47, 54, 61, 62, 55, 63,
64 };
65 
66 static av_cold int decode_init(AVCodecContext *avctx)
67 {
68  ProresContext *ctx = avctx->priv_data;
69  uint8_t idct_permutation[64];
70 
71  avctx->bits_per_raw_sample = 10;
72 
73  ff_dsputil_init(&ctx->dsp, avctx);
74  ff_proresdsp_init(&ctx->prodsp, avctx);
75 
76  ff_init_scantable_permutation(idct_permutation,
77  ctx->prodsp.idct_permutation_type);
78 
79  permute(ctx->progressive_scan, progressive_scan, idct_permutation);
80  permute(ctx->interlaced_scan, interlaced_scan, idct_permutation);
81 
82  return 0;
83 }
84 
85 static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
86  const int data_size, AVCodecContext *avctx)
87 {
88  int hdr_size, width, height, flags;
89  int version;
90  const uint8_t *ptr;
91 
92  hdr_size = AV_RB16(buf);
93  av_dlog(avctx, "header size %d\n", hdr_size);
94  if (hdr_size > data_size) {
95  av_log(avctx, AV_LOG_ERROR, "error, wrong header size\n");
96  return -1;
97  }
98 
99  version = AV_RB16(buf + 2);
100  av_dlog(avctx, "%.4s version %d\n", buf+4, version);
101  if (version > 1) {
102  av_log(avctx, AV_LOG_ERROR, "unsupported version: %d\n", version);
103  return -1;
104  }
105 
106  width = AV_RB16(buf + 8);
107  height = AV_RB16(buf + 10);
108  if (width != avctx->width || height != avctx->height) {
109  av_log(avctx, AV_LOG_ERROR, "picture resolution change: %dx%d -> %dx%d\n",
110  avctx->width, avctx->height, width, height);
111  return -1;
112  }
113 
114  ctx->frame_type = (buf[12] >> 2) & 3;
115  ctx->alpha_info = buf[17] & 0xf;
116 
117  if (ctx->alpha_info > 2) {
118  av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info);
119  return AVERROR_INVALIDDATA;
120  }
121 
122  av_dlog(avctx, "frame type %d\n", ctx->frame_type);
123 
124  if (ctx->frame_type == 0) {
125  ctx->scan = ctx->progressive_scan; // permuted
126  } else {
127  ctx->scan = ctx->interlaced_scan; // permuted
128  ctx->frame->interlaced_frame = 1;
129  ctx->frame->top_field_first = ctx->frame_type == 1;
130  }
131 
132  if (ctx->alpha_info) {
133  avctx->pix_fmt = (buf[12] & 0xC0) == 0xC0 ? AV_PIX_FMT_YUVA444P10 : AV_PIX_FMT_YUVA422P10;
134  } else {
135  avctx->pix_fmt = (buf[12] & 0xC0) == 0xC0 ? AV_PIX_FMT_YUV444P10 : AV_PIX_FMT_YUV422P10;
136  }
137 
138  ptr = buf + 20;
139  flags = buf[19];
140  av_dlog(avctx, "flags %x\n", flags);
141 
142  if (flags & 2) {
143  if(buf + data_size - ptr < 64) {
144  av_log(avctx, AV_LOG_ERROR, "Header truncated\n");
145  return -1;
146  }
147  permute(ctx->qmat_luma, ctx->prodsp.idct_permutation, ptr);
148  ptr += 64;
149  } else {
150  memset(ctx->qmat_luma, 4, 64);
151  }
152 
153  if (flags & 1) {
154  if(buf + data_size - ptr < 64) {
155  av_log(avctx, AV_LOG_ERROR, "Header truncated\n");
156  return -1;
157  }
158  permute(ctx->qmat_chroma, ctx->prodsp.idct_permutation, ptr);
159  } else {
160  memset(ctx->qmat_chroma, 4, 64);
161  }
162 
163  return hdr_size;
164 }
165 
166 static int decode_picture_header(AVCodecContext *avctx, const uint8_t *buf, const int buf_size)
167 {
168  ProresContext *ctx = avctx->priv_data;
169  int i, hdr_size, slice_count;
170  unsigned pic_data_size;
171  int log2_slice_mb_width, log2_slice_mb_height;
172  int slice_mb_count, mb_x, mb_y;
173  const uint8_t *data_ptr, *index_ptr;
174 
175  hdr_size = buf[0] >> 3;
176  if (hdr_size < 8 || hdr_size > buf_size) {
177  av_log(avctx, AV_LOG_ERROR, "error, wrong picture header size\n");
178  return -1;
179  }
180 
181  pic_data_size = AV_RB32(buf + 1);
182  if (pic_data_size > buf_size) {
183  av_log(avctx, AV_LOG_ERROR, "error, wrong picture data size\n");
184  return -1;
185  }
186 
187  log2_slice_mb_width = buf[7] >> 4;
188  log2_slice_mb_height = buf[7] & 0xF;
189  if (log2_slice_mb_width > 3 || log2_slice_mb_height) {
190  av_log(avctx, AV_LOG_ERROR, "unsupported slice resolution: %dx%d\n",
191  1 << log2_slice_mb_width, 1 << log2_slice_mb_height);
192  return -1;
193  }
194 
195  ctx->mb_width = (avctx->width + 15) >> 4;
196  if (ctx->frame_type)
197  ctx->mb_height = (avctx->height + 31) >> 5;
198  else
199  ctx->mb_height = (avctx->height + 15) >> 4;
200 
201  slice_count = AV_RB16(buf + 5);
202 
203  if (ctx->slice_count != slice_count || !ctx->slices) {
204  av_freep(&ctx->slices);
205  ctx->slices = av_mallocz(slice_count * sizeof(*ctx->slices));
206  if (!ctx->slices)
207  return AVERROR(ENOMEM);
208  ctx->slice_count = slice_count;
209  }
210 
211  if (!slice_count)
212  return AVERROR(EINVAL);
213 
214  if (hdr_size + slice_count*2 > buf_size) {
215  av_log(avctx, AV_LOG_ERROR, "error, wrong slice count\n");
216  return -1;
217  }
218 
219  // parse slice information
220  index_ptr = buf + hdr_size;
221  data_ptr = index_ptr + slice_count*2;
222 
223  slice_mb_count = 1 << log2_slice_mb_width;
224  mb_x = 0;
225  mb_y = 0;
226 
227  for (i = 0; i < slice_count; i++) {
228  SliceContext *slice = &ctx->slices[i];
229 
230  slice->data = data_ptr;
231  data_ptr += AV_RB16(index_ptr + i*2);
232 
233  while (ctx->mb_width - mb_x < slice_mb_count)
234  slice_mb_count >>= 1;
235 
236  slice->mb_x = mb_x;
237  slice->mb_y = mb_y;
238  slice->mb_count = slice_mb_count;
239  slice->data_size = data_ptr - slice->data;
240 
241  if (slice->data_size < 6) {
242  av_log(avctx, AV_LOG_ERROR, "error, wrong slice data size\n");
243  return -1;
244  }
245 
246  mb_x += slice_mb_count;
247  if (mb_x == ctx->mb_width) {
248  slice_mb_count = 1 << log2_slice_mb_width;
249  mb_x = 0;
250  mb_y++;
251  }
252  if (data_ptr > buf + buf_size) {
253  av_log(avctx, AV_LOG_ERROR, "error, slice out of bounds\n");
254  return -1;
255  }
256  }
257 
258  if (mb_x || mb_y != ctx->mb_height) {
259  av_log(avctx, AV_LOG_ERROR, "error wrong mb count y %d h %d\n",
260  mb_y, ctx->mb_height);
261  return -1;
262  }
263 
264  return pic_data_size;
265 }
266 
267 #define DECODE_CODEWORD(val, codebook) \
268  do { \
269  unsigned int rice_order, exp_order, switch_bits; \
270  unsigned int q, buf, bits; \
271  \
272  UPDATE_CACHE(re, gb); \
273  buf = GET_CACHE(re, gb); \
274  \
275  /* number of bits to switch between rice and exp golomb */ \
276  switch_bits = codebook & 3; \
277  rice_order = codebook >> 5; \
278  exp_order = (codebook >> 2) & 7; \
279  \
280  q = 31 - av_log2(buf); \
281  \
282  if (q > switch_bits) { /* exp golomb */ \
283  bits = exp_order - switch_bits + (q<<1); \
284  val = SHOW_UBITS(re, gb, bits) - (1 << exp_order) + \
285  ((switch_bits + 1) << rice_order); \
286  SKIP_BITS(re, gb, bits); \
287  } else if (rice_order) { \
288  SKIP_BITS(re, gb, q+1); \
289  val = (q << rice_order) + SHOW_UBITS(re, gb, rice_order); \
290  SKIP_BITS(re, gb, rice_order); \
291  } else { \
292  val = q; \
293  SKIP_BITS(re, gb, q+1); \
294  } \
295  } while (0)
296 
297 #define TOSIGNED(x) (((x) >> 1) ^ (-((x) & 1)))
298 
299 #define FIRST_DC_CB 0xB8
300 
301 static const uint8_t dc_codebook[7] = { 0x04, 0x28, 0x28, 0x4D, 0x4D, 0x70, 0x70};
302 
303 static av_always_inline void decode_dc_coeffs(GetBitContext *gb, int16_t *out,
304  int blocks_per_slice)
305 {
306  int16_t prev_dc;
307  int code, i, sign;
308 
309  OPEN_READER(re, gb);
310 
311  DECODE_CODEWORD(code, FIRST_DC_CB);
312  prev_dc = TOSIGNED(code);
313  out[0] = prev_dc;
314 
315  out += 64; // dc coeff for the next block
316 
317  code = 5;
318  sign = 0;
319  for (i = 1; i < blocks_per_slice; i++, out += 64) {
320  DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6U)]);
321  if(code) sign ^= -(code & 1);
322  else sign = 0;
323  prev_dc += (((code + 1) >> 1) ^ sign) - sign;
324  out[0] = prev_dc;
325  }
326  CLOSE_READER(re, gb);
327 }
328 
329 // adaptive codebook switching lut according to previous run/level values
330 static const uint8_t run_to_cb[16] = { 0x06, 0x06, 0x05, 0x05, 0x04, 0x29, 0x29, 0x29, 0x29, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x4C };
331 static const uint8_t lev_to_cb[10] = { 0x04, 0x0A, 0x05, 0x06, 0x04, 0x28, 0x28, 0x28, 0x28, 0x4C };
332 
333 static av_always_inline void decode_ac_coeffs(AVCodecContext *avctx, GetBitContext *gb,
334  int16_t *out, int blocks_per_slice)
335 {
336  ProresContext *ctx = avctx->priv_data;
337  int block_mask, sign;
338  unsigned pos, run, level;
339  int max_coeffs, i, bits_left;
340  int log2_block_count = av_log2(blocks_per_slice);
341 
342  OPEN_READER(re, gb);
343  UPDATE_CACHE(re, gb); \
344  run = 4;
345  level = 2;
346 
347  max_coeffs = 64 << log2_block_count;
348  block_mask = blocks_per_slice - 1;
349 
350  for (pos = block_mask;;) {
351  bits_left = gb->size_in_bits - re_index;
352  if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
353  break;
354 
355  DECODE_CODEWORD(run, run_to_cb[FFMIN(run, 15)]);
356  pos += run + 1;
357  if (pos >= max_coeffs) {
358  av_log(avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", pos, max_coeffs);
359  return;
360  }
361 
362  DECODE_CODEWORD(level, lev_to_cb[FFMIN(level, 9)]);
363  level += 1;
364 
365  i = pos >> log2_block_count;
366 
367  sign = SHOW_SBITS(re, gb, 1);
368  SKIP_BITS(re, gb, 1);
369  out[((pos & block_mask) << 6) + ctx->scan[i]] = ((level ^ sign) - sign);
370  }
371 
372  CLOSE_READER(re, gb);
373 }
374 
375 static void decode_slice_luma(AVCodecContext *avctx, SliceContext *slice,
376  uint16_t *dst, int dst_stride,
377  const uint8_t *buf, unsigned buf_size,
378  const int16_t *qmat)
379 {
380  ProresContext *ctx = avctx->priv_data;
381  LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
382  int16_t *block;
383  GetBitContext gb;
384  int i, blocks_per_slice = slice->mb_count<<2;
385 
386  for (i = 0; i < blocks_per_slice; i++)
387  ctx->dsp.clear_block(blocks+(i<<6));
388 
389  init_get_bits(&gb, buf, buf_size << 3);
390 
391  decode_dc_coeffs(&gb, blocks, blocks_per_slice);
392  decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice);
393 
394  block = blocks;
395  for (i = 0; i < slice->mb_count; i++) {
396  ctx->prodsp.idct_put(dst, dst_stride, block+(0<<6), qmat);
397  ctx->prodsp.idct_put(dst +8, dst_stride, block+(1<<6), qmat);
398  ctx->prodsp.idct_put(dst+4*dst_stride , dst_stride, block+(2<<6), qmat);
399  ctx->prodsp.idct_put(dst+4*dst_stride+8, dst_stride, block+(3<<6), qmat);
400  block += 4*64;
401  dst += 16;
402  }
403 }
404 
405 static void decode_slice_chroma(AVCodecContext *avctx, SliceContext *slice,
406  uint16_t *dst, int dst_stride,
407  const uint8_t *buf, unsigned buf_size,
408  const int16_t *qmat, int log2_blocks_per_mb)
409 {
410  ProresContext *ctx = avctx->priv_data;
411  LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
412  int16_t *block;
413  GetBitContext gb;
414  int i, j, blocks_per_slice = slice->mb_count << log2_blocks_per_mb;
415 
416  for (i = 0; i < blocks_per_slice; i++)
417  ctx->dsp.clear_block(blocks+(i<<6));
418 
419  init_get_bits(&gb, buf, buf_size << 3);
420 
421  decode_dc_coeffs(&gb, blocks, blocks_per_slice);
422  decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice);
423 
424  block = blocks;
425  for (i = 0; i < slice->mb_count; i++) {
426  for (j = 0; j < log2_blocks_per_mb; j++) {
427  ctx->prodsp.idct_put(dst, dst_stride, block+(0<<6), qmat);
428  ctx->prodsp.idct_put(dst+4*dst_stride, dst_stride, block+(1<<6), qmat);
429  block += 2*64;
430  dst += 8;
431  }
432  }
433 }
434 
435 static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
436  const int num_bits)
437 {
438  const int mask = (1 << num_bits) - 1;
439  int i, idx, val, alpha_val;
440 
441  idx = 0;
442  alpha_val = mask;
443  do {
444  do {
445  if (get_bits1(gb)) {
446  val = get_bits(gb, num_bits);
447  } else {
448  int sign;
449  val = get_bits(gb, num_bits == 16 ? 7 : 4);
450  sign = val & 1;
451  val = (val + 2) >> 1;
452  if (sign)
453  val = -val;
454  }
455  alpha_val = (alpha_val + val) & mask;
456  if (num_bits == 16) {
457  dst[idx++] = alpha_val >> 6;
458  } else {
459  dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
460  }
461  if (idx >= num_coeffs)
462  break;
463  } while (get_bits_left(gb)>0 && get_bits1(gb));
464  val = get_bits(gb, 4);
465  if (!val)
466  val = get_bits(gb, 11);
467  if (idx + val > num_coeffs)
468  val = num_coeffs - idx;
469  if (num_bits == 16) {
470  for (i = 0; i < val; i++)
471  dst[idx++] = alpha_val >> 6;
472  } else {
473  for (i = 0; i < val; i++)
474  dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
475 
476  }
477  } while (idx < num_coeffs);
478 }
479 
480 /**
481  * Decode alpha slice plane.
482  */
483 static void decode_slice_alpha(ProresContext *ctx,
484  uint16_t *dst, int dst_stride,
485  const uint8_t *buf, int buf_size,
486  int blocks_per_slice)
487 {
488  GetBitContext gb;
489  int i;
490  LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
491  int16_t *block;
492 
493  for (i = 0; i < blocks_per_slice<<2; i++)
494  ctx->dsp.clear_block(blocks+(i<<6));
495 
496  init_get_bits(&gb, buf, buf_size << 3);
497 
498  if (ctx->alpha_info == 2) {
499  unpack_alpha(&gb, blocks, blocks_per_slice * 4 * 64, 16);
500  } else {
501  unpack_alpha(&gb, blocks, blocks_per_slice * 4 * 64, 8);
502  }
503 
504  block = blocks;
505  for (i = 0; i < 16; i++) {
506  memcpy(dst, block, 16 * blocks_per_slice * sizeof(*dst));
507  dst += dst_stride >> 1;
508  block += 16 * blocks_per_slice;
509  }
510 }
511 
512 static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)
513 {
514  ProresContext *ctx = avctx->priv_data;
515  SliceContext *slice = &ctx->slices[jobnr];
516  const uint8_t *buf = slice->data;
517  AVFrame *pic = ctx->frame;
518  int i, hdr_size, qscale, log2_chroma_blocks_per_mb;
519  int luma_stride, chroma_stride;
520  int y_data_size, u_data_size, v_data_size, a_data_size;
521  uint8_t *dest_y, *dest_u, *dest_v, *dest_a;
522  int16_t qmat_luma_scaled[64];
523  int16_t qmat_chroma_scaled[64];
524  int mb_x_shift;
525 
526  slice->ret = -1;
527  //av_log(avctx, AV_LOG_INFO, "slice %d mb width %d mb x %d y %d\n",
528  // jobnr, slice->mb_count, slice->mb_x, slice->mb_y);
529 
530  // slice header
531  hdr_size = buf[0] >> 3;
532  qscale = av_clip(buf[1], 1, 224);
533  qscale = qscale > 128 ? qscale - 96 << 2: qscale;
534  y_data_size = AV_RB16(buf + 2);
535  u_data_size = AV_RB16(buf + 4);
536  v_data_size = slice->data_size - y_data_size - u_data_size - hdr_size;
537  if (hdr_size > 7) v_data_size = AV_RB16(buf + 6);
538  a_data_size = slice->data_size - y_data_size - u_data_size -
539  v_data_size - hdr_size;
540 
541  if (y_data_size < 0 || u_data_size < 0 || v_data_size < 0
542  || hdr_size+y_data_size+u_data_size+v_data_size > slice->data_size){
543  av_log(avctx, AV_LOG_ERROR, "invalid plane data size\n");
544  return -1;
545  }
546 
547  buf += hdr_size;
548 
549  for (i = 0; i < 64; i++) {
550  qmat_luma_scaled [i] = ctx->qmat_luma [i] * qscale;
551  qmat_chroma_scaled[i] = ctx->qmat_chroma[i] * qscale;
552  }
553 
554  if (ctx->frame_type == 0) {
555  luma_stride = pic->linesize[0];
556  chroma_stride = pic->linesize[1];
557  } else {
558  luma_stride = pic->linesize[0] << 1;
559  chroma_stride = pic->linesize[1] << 1;
560  }
561 
562  if (avctx->pix_fmt == AV_PIX_FMT_YUV444P10 || avctx->pix_fmt == AV_PIX_FMT_YUVA444P10) {
563  mb_x_shift = 5;
564  log2_chroma_blocks_per_mb = 2;
565  } else {
566  mb_x_shift = 4;
567  log2_chroma_blocks_per_mb = 1;
568  }
569 
570  dest_y = pic->data[0] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
571  dest_u = pic->data[1] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << mb_x_shift);
572  dest_v = pic->data[2] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << mb_x_shift);
573  dest_a = pic->data[3] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
574 
575  if (ctx->frame_type && ctx->first_field ^ ctx->frame->top_field_first) {
576  dest_y += pic->linesize[0];
577  dest_u += pic->linesize[1];
578  dest_v += pic->linesize[2];
579  dest_a += pic->linesize[3];
580  }
581 
582  decode_slice_luma(avctx, slice, (uint16_t*)dest_y, luma_stride,
583  buf, y_data_size, qmat_luma_scaled);
584 
585  if (!(avctx->flags & CODEC_FLAG_GRAY)) {
586  decode_slice_chroma(avctx, slice, (uint16_t*)dest_u, chroma_stride,
587  buf + y_data_size, u_data_size,
588  qmat_chroma_scaled, log2_chroma_blocks_per_mb);
589  decode_slice_chroma(avctx, slice, (uint16_t*)dest_v, chroma_stride,
590  buf + y_data_size + u_data_size, v_data_size,
591  qmat_chroma_scaled, log2_chroma_blocks_per_mb);
592  }
593  /* decode alpha plane if available */
594  if (ctx->alpha_info && pic->data[3] && a_data_size)
595  decode_slice_alpha(ctx, (uint16_t*)dest_a, luma_stride,
596  buf + y_data_size + u_data_size + v_data_size,
597  a_data_size, slice->mb_count);
598 
599  slice->ret = 0;
600  return 0;
601 }
602 
603 static int decode_picture(AVCodecContext *avctx)
604 {
605  ProresContext *ctx = avctx->priv_data;
606  int i;
607 
608  avctx->execute2(avctx, decode_slice_thread, NULL, NULL, ctx->slice_count);
609 
610  for (i = 0; i < ctx->slice_count; i++)
611  if (ctx->slices[i].ret < 0)
612  return ctx->slices[i].ret;
613 
614  return 0;
615 }
616 
617 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
618  AVPacket *avpkt)
619 {
620  ProresContext *ctx = avctx->priv_data;
621  AVFrame *frame = data;
622  const uint8_t *buf = avpkt->data;
623  int buf_size = avpkt->size;
624  int frame_hdr_size, pic_size;
625 
626  if (buf_size < 28 || AV_RL32(buf + 4) != AV_RL32("icpf")) {
627  av_log(avctx, AV_LOG_ERROR, "invalid frame header\n");
628  return -1;
629  }
630 
631  ctx->frame = frame;
632  ctx->frame->pict_type = AV_PICTURE_TYPE_I;
633  ctx->frame->key_frame = 1;
634  ctx->first_field = 1;
635 
636  buf += 8;
637  buf_size -= 8;
638 
639  frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx);
640  if (frame_hdr_size < 0)
641  return -1;
642 
643  buf += frame_hdr_size;
644  buf_size -= frame_hdr_size;
645 
646  if (ff_get_buffer(avctx, frame, 0) < 0)
647  return -1;
648 
649  decode_picture:
650  pic_size = decode_picture_header(avctx, buf, buf_size);
651  if (pic_size < 0) {
652  av_log(avctx, AV_LOG_ERROR, "error decoding picture header\n");
653  return -1;
654  }
655 
656  if (decode_picture(avctx)) {
657  av_log(avctx, AV_LOG_ERROR, "error decoding picture\n");
658  return -1;
659  }
660 
661  buf += pic_size;
662  buf_size -= pic_size;
663 
664  if (ctx->frame_type && buf_size > 0 && ctx->first_field) {
665  ctx->first_field = 0;
666  goto decode_picture;
667  }
668 
669  *got_frame = 1;
670 
671  return avpkt->size;
672 }
673 
674 static av_cold int decode_close(AVCodecContext *avctx)
675 {
676  ProresContext *ctx = avctx->priv_data;
677 
678  av_freep(&ctx->slices);
679 
680  return 0;
681 }
682 
683 AVCodec ff_prores_decoder = {
684  .name = "prores",
685  .type = AVMEDIA_TYPE_VIDEO,
686  .id = AV_CODEC_ID_PRORES,
687  .priv_data_size = sizeof(ProresContext),
688  .init = decode_init,
689  .close = decode_close,
690  .decode = decode_frame,
691  .long_name = NULL_IF_CONFIG_SMALL("ProRes"),
692  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
693 };
Generated on Wed Jul 10 2013 23:48:03 for FFmpeg by   doxygen 1.8.2