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dnxhddec.c
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1 /*
2  * VC3/DNxHD decoder.
3  * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
4  * Copyright (c) 2011 MirriAd Ltd
5  *
6  * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "libavutil/imgutils.h"
26 #include "libavutil/timer.h"
27 #include "avcodec.h"
28 #include "blockdsp.h"
29 #include "get_bits.h"
30 #include "dnxhddata.h"
31 #include "idctdsp.h"
32 #include "internal.h"
33 #include "thread.h"
34 
35 typedef struct DNXHDContext {
39  int64_t cid; ///< compression id
40  unsigned int width, height;
42  unsigned int mb_width, mb_height;
43  uint32_t mb_scan_index[68]; /* max for 1080p */
44  int cur_field; ///< current interlaced field
46  int last_dc[3];
48  DECLARE_ALIGNED(16, int16_t, blocks)[12][64];
51  int bit_depth; // 8, 10 or 0 if not initialized at all.
52  int is_444;
53  void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
54  int n, int qscale);
56  int luma_scale[64];
57  int chroma_scale[64];
58 } DNXHDContext;
59 
60 #define DNXHD_VLC_BITS 9
61 #define DNXHD_DC_VLC_BITS 7
62 
63 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
64  int n, int qscale);
65 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
66  int n, int qscale);
67 static void dnxhd_decode_dct_block_10_444(DNXHDContext *ctx, int16_t *block,
68  int n, int qscale);
69 
71 {
72  DNXHDContext *ctx = avctx->priv_data;
73 
74  ctx->avctx = avctx;
75  ctx->cid = -1;
76  return 0;
77 }
78 
79 static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid)
80 {
81  if (cid != ctx->cid) {
82  int index;
83 
84  if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
85  av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
86  return AVERROR(ENOSYS);
87  }
88  if (ff_dnxhd_cid_table[index].bit_depth != ctx->bit_depth) {
89  av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, ctx->bit_depth);
90  return AVERROR_INVALIDDATA;
91  }
93 
94  ff_free_vlc(&ctx->ac_vlc);
95  ff_free_vlc(&ctx->dc_vlc);
96  ff_free_vlc(&ctx->run_vlc);
97 
98  init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
99  ctx->cid_table->ac_bits, 1, 1,
100  ctx->cid_table->ac_codes, 2, 2, 0);
101  init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
102  ctx->cid_table->dc_bits, 1, 1,
103  ctx->cid_table->dc_codes, 1, 1, 0);
104  init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
105  ctx->cid_table->run_bits, 1, 1,
106  ctx->cid_table->run_codes, 2, 2, 0);
107 
110  ctx->cid = cid;
111  }
112  return 0;
113 }
114 
116  const uint8_t *buf, int buf_size,
117  int first_field)
118 {
119  static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
120  static const uint8_t header_prefix444[] = { 0x00, 0x00, 0x02, 0x80, 0x02 };
121  int i, cid, ret;
122 
123  if (buf_size < 0x280)
124  return AVERROR_INVALIDDATA;
125 
126  if (memcmp(buf, header_prefix, 5) && memcmp(buf, header_prefix444, 5)) {
127  av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
128  return AVERROR_INVALIDDATA;
129  }
130  if (buf[5] & 2) { /* interlaced */
131  ctx->cur_field = buf[5] & 1;
132  frame->interlaced_frame = 1;
133  frame->top_field_first = first_field ^ ctx->cur_field;
134  av_log(ctx->avctx, AV_LOG_DEBUG,
135  "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
136  }
137 
138  ctx->height = AV_RB16(buf + 0x18);
139  ctx->width = AV_RB16(buf + 0x1a);
140 
141  av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
142 
143  ctx->is_444 = 0;
144  if (buf[0x4] == 0x2) {
146  ctx->avctx->bits_per_raw_sample = 10;
147  if (ctx->bit_depth != 10) {
148  ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
149  ff_idctdsp_init(&ctx->idsp, ctx->avctx);
150  ctx->bit_depth = 10;
152  }
153  ctx->is_444 = 1;
154  } else if (buf[0x21] & 0x40) {
156  ctx->avctx->bits_per_raw_sample = 10;
157  if (ctx->bit_depth != 10) {
158  ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
159  ff_idctdsp_init(&ctx->idsp, ctx->avctx);
160  ctx->bit_depth = 10;
162  }
163  } else {
165  ctx->avctx->bits_per_raw_sample = 8;
166  if (ctx->bit_depth != 8) {
167  ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
168  ff_idctdsp_init(&ctx->idsp, ctx->avctx);
169  ctx->bit_depth = 8;
171  }
172  }
173 
174  cid = AV_RB32(buf + 0x28);
175  av_dlog(ctx->avctx, "compression id %d\n", cid);
176 
177  if ((ret = dnxhd_init_vlc(ctx, cid)) < 0)
178  return ret;
179 
180  if (buf_size < ctx->cid_table->coding_unit_size) {
181  av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
182  return AVERROR_INVALIDDATA;
183  }
184 
185  ctx->mb_width = ctx->width >> 4;
186  ctx->mb_height = buf[0x16d];
187 
188  av_dlog(ctx->avctx,
189  "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
190 
191  if ((ctx->height + 15) >> 4 == ctx->mb_height && frame->interlaced_frame)
192  ctx->height <<= 1;
193 
194  if (ctx->mb_height > 68 ||
195  (ctx->mb_height << frame->interlaced_frame) > (ctx->height + 15) >> 4) {
196  av_log(ctx->avctx, AV_LOG_ERROR,
197  "mb height too big: %d\n", ctx->mb_height);
198  return AVERROR_INVALIDDATA;
199  }
200 
201  for (i = 0; i < ctx->mb_height; i++) {
202  ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i << 2));
203  av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
204  if (buf_size < ctx->mb_scan_index[i] + 0x280LL) {
205  av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
206  return AVERROR_INVALIDDATA;
207  }
208  }
209 
210  return 0;
211 }
212 
214  int16_t *block, int n,
215  int qscale,
216  int index_bits,
217  int level_bias,
218  int level_shift)
219 {
220  int i, j, index1, index2, len, flags;
221  int level, component, sign;
222  const int *scale;
223  const uint8_t *weight_matrix;
224  const uint8_t *ac_level = ctx->cid_table->ac_level;
225  const uint8_t *ac_flags = ctx->cid_table->ac_flags;
226  const int eob_index = ctx->cid_table->eob_index;
227  OPEN_READER(bs, &ctx->gb);
228 
229  if (!ctx->is_444) {
230  if (n & 2) {
231  component = 1 + (n & 1);
232  scale = ctx->chroma_scale;
233  weight_matrix = ctx->cid_table->chroma_weight;
234  } else {
235  component = 0;
236  scale = ctx->luma_scale;
237  weight_matrix = ctx->cid_table->luma_weight;
238  }
239  } else {
240  component = (n >> 1) % 3;
241  if (component) {
242  scale = ctx->chroma_scale;
243  weight_matrix = ctx->cid_table->chroma_weight;
244  } else {
245  scale = ctx->luma_scale;
246  weight_matrix = ctx->cid_table->luma_weight;
247  }
248  }
249 
250  UPDATE_CACHE(bs, &ctx->gb);
251  GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
252  if (len) {
253  level = GET_CACHE(bs, &ctx->gb);
254  LAST_SKIP_BITS(bs, &ctx->gb, len);
255  sign = ~level >> 31;
256  level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
257  ctx->last_dc[component] += level;
258  }
259  block[0] = ctx->last_dc[component];
260 
261  i = 0;
262 
263  UPDATE_CACHE(bs, &ctx->gb);
264  GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
265  DNXHD_VLC_BITS, 2);
266 
267  while (index1 != eob_index) {
268  level = ac_level[index1];
269  flags = ac_flags[index1];
270 
271  sign = SHOW_SBITS(bs, &ctx->gb, 1);
272  SKIP_BITS(bs, &ctx->gb, 1);
273 
274  if (flags & 1) {
275  level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 7;
276  SKIP_BITS(bs, &ctx->gb, index_bits);
277  }
278 
279  if (flags & 2) {
280  UPDATE_CACHE(bs, &ctx->gb);
281  GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
282  DNXHD_VLC_BITS, 2);
283  i += ctx->cid_table->run[index2];
284  }
285 
286  if (++i > 63) {
287  av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
288  break;
289  }
290 
291  j = ctx->scantable.permutated[i];
292  level *= scale[i];
293  if (level_bias < 32 || weight_matrix[i] != level_bias)
294  level += level_bias;
295  level >>= level_shift;
296 
297  block[j] = (level ^ sign) - sign;
298 
299  UPDATE_CACHE(bs, &ctx->gb);
300  GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
301  DNXHD_VLC_BITS, 2);
302  }
303 
304  CLOSE_READER(bs, &ctx->gb);
305 }
306 
307 static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
308  int n, int qscale)
309 {
310  dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
311 }
312 
313 static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
314  int n, int qscale)
315 {
316  dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
317 }
318 
320  int n, int qscale)
321 {
322  dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 32, 6);
323 }
324 
326  int x, int y)
327 {
328  int shift1 = ctx->bit_depth == 10;
329  int dct_linesize_luma = frame->linesize[0];
330  int dct_linesize_chroma = frame->linesize[1];
331  uint8_t *dest_y, *dest_u, *dest_v;
332  int dct_y_offset, dct_x_offset;
333  int qscale, i;
334 
335  qscale = get_bits(&ctx->gb, 11);
336  skip_bits1(&ctx->gb);
337 
338  if (qscale != ctx->last_qscale) {
339  for (i = 0; i < 64; i++) {
340  ctx->luma_scale[i] = qscale * ctx->cid_table->luma_weight[i];
341  ctx->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];
342  }
343  ctx->last_qscale = qscale;
344  }
345 
346  for (i = 0; i < 8; i++) {
347  ctx->bdsp.clear_block(ctx->blocks[i]);
348  ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
349  }
350  if (ctx->is_444) {
351  for (; i < 12; i++) {
352  ctx->bdsp.clear_block(ctx->blocks[i]);
353  ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
354  }
355  }
356 
357  if (frame->interlaced_frame) {
358  dct_linesize_luma <<= 1;
359  dct_linesize_chroma <<= 1;
360  }
361 
362  dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
363  dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));
364  dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));
365 
366  if (ctx->cur_field) {
367  dest_y += frame->linesize[0];
368  dest_u += frame->linesize[1];
369  dest_v += frame->linesize[2];
370  }
371 
372  dct_y_offset = dct_linesize_luma << 3;
373  dct_x_offset = 8 << shift1;
374  if (!ctx->is_444) {
375  ctx->idsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
376  ctx->idsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
377  ctx->idsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
378  ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
379 
380  if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
381  dct_y_offset = dct_linesize_chroma << 3;
382  ctx->idsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
383  ctx->idsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
384  ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
385  ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
386  }
387  } else {
388  ctx->idsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
389  ctx->idsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
390  ctx->idsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[6]);
391  ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[7]);
392 
393  if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
394  dct_y_offset = dct_linesize_chroma << 3;
395  ctx->idsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
396  ctx->idsp.idct_put(dest_u + dct_x_offset, dct_linesize_chroma, ctx->blocks[3]);
397  ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[8]);
398  ctx->idsp.idct_put(dest_u + dct_y_offset + dct_x_offset, dct_linesize_chroma, ctx->blocks[9]);
399  ctx->idsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[4]);
400  ctx->idsp.idct_put(dest_v + dct_x_offset, dct_linesize_chroma, ctx->blocks[5]);
401  ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[10]);
402  ctx->idsp.idct_put(dest_v + dct_y_offset + dct_x_offset, dct_linesize_chroma, ctx->blocks[11]);
403  }
404  }
405 
406  return 0;
407 }
408 
410  const uint8_t *buf, int buf_size)
411 {
412  int x, y;
413  for (y = 0; y < ctx->mb_height; y++) {
414  ctx->last_dc[0] =
415  ctx->last_dc[1] =
416  ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
417  init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
418  for (x = 0; x < ctx->mb_width; x++) {
419  //START_TIMER;
420  dnxhd_decode_macroblock(ctx, frame, x, y);
421  //STOP_TIMER("decode macroblock");
422  }
423  }
424  return 0;
425 }
426 
428  int *got_frame, AVPacket *avpkt)
429 {
430  const uint8_t *buf = avpkt->data;
431  int buf_size = avpkt->size;
432  DNXHDContext *ctx = avctx->priv_data;
433  ThreadFrame frame = { .f = data };
434  AVFrame *picture = data;
435  int first_field = 1;
436  int ret;
437 
438  av_dlog(avctx, "frame size %d\n", buf_size);
439 
440 decode_coding_unit:
441  if ((ret = dnxhd_decode_header(ctx, picture, buf, buf_size, first_field)) < 0)
442  return ret;
443 
444  if ((avctx->width || avctx->height) &&
445  (ctx->width != avctx->width || ctx->height != avctx->height)) {
446  av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
447  avctx->width, avctx->height, ctx->width, ctx->height);
448  first_field = 1;
449  }
450  if (avctx->pix_fmt != AV_PIX_FMT_NONE && avctx->pix_fmt != ctx->pix_fmt) {
451  av_log(avctx, AV_LOG_WARNING, "pix_fmt changed: %s -> %s\n",
453  first_field = 1;
454  }
455 
456  avctx->pix_fmt = ctx->pix_fmt;
457  ret = ff_set_dimensions(avctx, ctx->width, ctx->height);
458  if (ret < 0)
459  return ret;
460 
461  if (first_field) {
462  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
463  return ret;
464  picture->pict_type = AV_PICTURE_TYPE_I;
465  picture->key_frame = 1;
466  }
467 
468  dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);
469 
470  if (first_field && picture->interlaced_frame) {
471  buf += ctx->cid_table->coding_unit_size;
472  buf_size -= ctx->cid_table->coding_unit_size;
473  first_field = 0;
474  goto decode_coding_unit;
475  }
476 
477  *got_frame = 1;
478  return avpkt->size;
479 }
480 
482 {
483  DNXHDContext *ctx = avctx->priv_data;
484 
485  ff_free_vlc(&ctx->ac_vlc);
486  ff_free_vlc(&ctx->dc_vlc);
487  ff_free_vlc(&ctx->run_vlc);
488  return 0;
489 }
490 
492  .name = "dnxhd",
493  .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
494  .type = AVMEDIA_TYPE_VIDEO,
495  .id = AV_CODEC_ID_DNXHD,
496  .priv_data_size = sizeof(DNXHDContext),
500  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
501 };