lavc: add a wrapper for AVCodecContext.get_buffer().
[libav.git] / libavcodec / ffv1dec.c
1 /*
2 * FFV1 decoder
3 *
4 * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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 * FF Video Codec 1 (a lossless codec) decoder
26 */
27
28 #include "libavutil/avassert.h"
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/crc.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/imgutils.h"
33 #include "avcodec.h"
34 #include "internal.h"
35 #include "get_bits.h"
36 #include "put_bits.h"
37 #include "dsputil.h"
38 #include "rangecoder.h"
39 #include "golomb.h"
40 #include "mathops.h"
41 #include "ffv1.h"
42
43 static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
44 int is_signed)
45 {
46 if (get_rac(c, state + 0))
47 return 0;
48 else {
49 int i, e, a;
50 e = 0;
51 while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10
52 e++;
53
54 a = 1;
55 for (i = e - 1; i >= 0; i--)
56 a += a + get_rac(c, state + 22 + FFMIN(i, 9)); // 22..31
57
58 e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21
59 return (a ^ e) - e;
60 }
61 }
62
63 static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
64 {
65 return get_symbol_inline(c, state, is_signed);
66 }
67
68 static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
69 int bits)
70 {
71 int k, i, v, ret;
72
73 i = state->count;
74 k = 0;
75 while (i < state->error_sum) { // FIXME: optimize
76 k++;
77 i += i;
78 }
79
80 assert(k <= 8);
81
82 v = get_sr_golomb(gb, k, 12, bits);
83 av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
84 v, state->bias, state->error_sum, state->drift, state->count, k);
85
86 #if 0 // JPEG LS
87 if (k == 0 && 2 * state->drift <= -state->count)
88 v ^= (-1);
89 #else
90 v ^= ((2 * state->drift + state->count) >> 31);
91 #endif
92
93 ret = fold(v + state->bias, bits);
94
95 update_vlc_state(state, v);
96
97 return ret;
98 }
99
100 static av_always_inline void decode_line(FFV1Context *s, int w,
101 int16_t *sample[2],
102 int plane_index, int bits)
103 {
104 PlaneContext *const p = &s->plane[plane_index];
105 RangeCoder *const c = &s->c;
106 int x;
107 int run_count = 0;
108 int run_mode = 0;
109 int run_index = s->run_index;
110
111 for (x = 0; x < w; x++) {
112 int diff, context, sign;
113
114 context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);
115 if (context < 0) {
116 context = -context;
117 sign = 1;
118 } else
119 sign = 0;
120
121 av_assert2(context < p->context_count);
122
123 if (s->ac) {
124 diff = get_symbol_inline(c, p->state[context], 1);
125 } else {
126 if (context == 0 && run_mode == 0)
127 run_mode = 1;
128
129 if (run_mode) {
130 if (run_count == 0 && run_mode == 1) {
131 if (get_bits1(&s->gb)) {
132 run_count = 1 << ff_log2_run[run_index];
133 if (x + run_count <= w)
134 run_index++;
135 } else {
136 if (ff_log2_run[run_index])
137 run_count = get_bits(&s->gb, ff_log2_run[run_index]);
138 else
139 run_count = 0;
140 if (run_index)
141 run_index--;
142 run_mode = 2;
143 }
144 }
145 run_count--;
146 if (run_count < 0) {
147 run_mode = 0;
148 run_count = 0;
149 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],
150 bits);
151 if (diff >= 0)
152 diff++;
153 } else
154 diff = 0;
155 } else
156 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
157
158 av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
159 run_count, run_index, run_mode, x, get_bits_count(&s->gb));
160 }
161
162 if (sign)
163 diff = -diff;
164
165 sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &
166 ((1 << bits) - 1);
167 }
168 s->run_index = run_index;
169 }
170
171 static void decode_plane(FFV1Context *s, uint8_t *src,
172 int w, int h, int stride, int plane_index)
173 {
174 int x, y;
175 int16_t *sample[2];
176 sample[0] = s->sample_buffer + 3;
177 sample[1] = s->sample_buffer + w + 6 + 3;
178
179 s->run_index = 0;
180
181 memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));
182
183 for (y = 0; y < h; y++) {
184 int16_t *temp = sample[0]; // FIXME: try a normal buffer
185
186 sample[0] = sample[1];
187 sample[1] = temp;
188
189 sample[1][-1] = sample[0][0];
190 sample[0][w] = sample[0][w - 1];
191
192 // { START_TIMER
193 if (s->avctx->bits_per_raw_sample <= 8) {
194 decode_line(s, w, sample, plane_index, 8);
195 for (x = 0; x < w; x++)
196 src[x + stride * y] = sample[1][x];
197 } else {
198 decode_line(s, w, sample, plane_index,
199 s->avctx->bits_per_raw_sample);
200 if (s->packed_at_lsb) {
201 for (x = 0; x < w; x++)
202 ((uint16_t *)(src + stride * y))[x] = sample[1][x];
203 } else {
204 for (x = 0; x < w; x++)
205 ((uint16_t *)(src + stride * y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);
206 }
207 }
208 // STOP_TIMER("decode-line") }
209 }
210 }
211
212 static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h,
213 int stride[3])
214 {
215 int x, y, p;
216 int16_t *sample[4][2];
217 int lbd = s->avctx->bits_per_raw_sample <= 8;
218 int bits = s->avctx->bits_per_raw_sample > 0
219 ? s->avctx->bits_per_raw_sample
220 : 8;
221 int offset = 1 << bits;
222
223 for (x = 0; x < 4; x++) {
224 sample[x][0] = s->sample_buffer + x * 2 * (w + 6) + 3;
225 sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;
226 }
227
228 s->run_index = 0;
229
230 memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));
231
232 for (y = 0; y < h; y++) {
233 for (p = 0; p < 3 + s->transparency; p++) {
234 int16_t *temp = sample[p][0]; //FIXME try a normal buffer
235
236 sample[p][0] = sample[p][1];
237 sample[p][1] = temp;
238
239 sample[p][1][-1] = sample[p][0][0];
240 sample[p][0][w] = sample[p][0][w - 1];
241 if (lbd)
242 decode_line(s, w, sample[p], (p + 1) / 2, 9);
243 else
244 decode_line(s, w, sample[p], (p + 1) / 2, bits + 1);
245 }
246 for (x = 0; x < w; x++) {
247 int g = sample[0][1][x];
248 int b = sample[1][1][x];
249 int r = sample[2][1][x];
250 int a = sample[3][1][x];
251
252 b -= offset;
253 r -= offset;
254 g -= (b + r) >> 2;
255 b += g;
256 r += g;
257
258 if (lbd)
259 *((uint32_t *)(src[0] + x * 4 + stride[0] * y)) = b +
260 (g << 8) + (r << 16) + (a << 24);
261 else {
262 *((uint16_t *)(src[0] + x * 2 + stride[0] * y)) = b;
263 *((uint16_t *)(src[1] + x * 2 + stride[1] * y)) = g;
264 *((uint16_t *)(src[2] + x * 2 + stride[2] * y)) = r;
265 }
266 }
267 }
268 }
269
270 static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
271 {
272 RangeCoder *c = &fs->c;
273 uint8_t state[CONTEXT_SIZE];
274 unsigned ps, i, context_count;
275 memset(state, 128, sizeof(state));
276
277 if (fs->ac > 1) {
278 for (i = 1; i < 256; i++) {
279 fs->c.one_state[i] = f->state_transition[i];
280 fs->c.zero_state[256 - i] = 256 - fs->c.one_state[i];
281 }
282 }
283
284 fs->slice_x = get_symbol(c, state, 0) * f->width;
285 fs->slice_y = get_symbol(c, state, 0) * f->height;
286 fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;
287 fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
288
289 fs->slice_x /= f->num_h_slices;
290 fs->slice_y /= f->num_v_slices;
291 fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x;
292 fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;
293 if ((unsigned)fs->slice_width > f->width ||
294 (unsigned)fs->slice_height > f->height)
295 return AVERROR_INVALIDDATA;
296 if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width ||
297 (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
298 return AVERROR_INVALIDDATA;
299
300 for (i = 0; i < f->plane_count; i++) {
301 PlaneContext *const p = &fs->plane[i];
302 int idx = get_symbol(c, state, 0);
303 if (idx > (unsigned)f->quant_table_count) {
304 av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
305 return AVERROR_INVALIDDATA;
306 }
307 p->quant_table_index = idx;
308 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));
309 context_count = f->context_count[idx];
310
311 if (p->context_count < context_count) {
312 av_freep(&p->state);
313 av_freep(&p->vlc_state);
314 }
315 p->context_count = context_count;
316 }
317
318 ps = get_symbol(c, state, 0);
319 if (ps == 1) {
320 f->picture.interlaced_frame = 1;
321 f->picture.top_field_first = 1;
322 } else if (ps == 2) {
323 f->picture.interlaced_frame = 1;
324 f->picture.top_field_first = 0;
325 } else if (ps == 3) {
326 f->picture.interlaced_frame = 0;
327 }
328 f->picture.sample_aspect_ratio.num = get_symbol(c, state, 0);
329 f->picture.sample_aspect_ratio.den = get_symbol(c, state, 0);
330
331 return 0;
332 }
333
334 static int decode_slice(AVCodecContext *c, void *arg)
335 {
336 FFV1Context *fs = *(void **)arg;
337 FFV1Context *f = fs->avctx->priv_data;
338 int width, height, x, y, ret;
339 const int ps = (av_pix_fmt_desc_get(c->pix_fmt)->flags & PIX_FMT_PLANAR)
340 ? (c->bits_per_raw_sample > 8) + 1
341 : 4;
342 AVFrame *const p = &f->picture;
343
344 if (f->version > 2) {
345 if (decode_slice_header(f, fs) < 0) {
346 fs->slice_damaged = 1;
347 return AVERROR_INVALIDDATA;
348 }
349 }
350 if ((ret = ffv1_init_slice_state(f, fs)) < 0)
351 return ret;
352 if (f->picture.key_frame)
353 ffv1_clear_slice_state(f, fs);
354 width = fs->slice_width;
355 height = fs->slice_height;
356 x = fs->slice_x;
357 y = fs->slice_y;
358
359 if (!fs->ac) {
360 if (f->version == 3 && f->minor_version > 1 || f->version > 3)
361 get_rac(&fs->c, (uint8_t[]) { 129 });
362 fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;
363 init_get_bits(&fs->gb, fs->c.bytestream_start + fs->ac_byte_count,
364 (fs->c.bytestream_end - fs->c.bytestream_start -
365 fs->ac_byte_count) * 8);
366 }
367
368 av_assert1(width && height);
369 if (f->colorspace == 0) {
370 const int chroma_width = -((-width) >> f->chroma_h_shift);
371 const int chroma_height = -((-height) >> f->chroma_v_shift);
372 const int cx = x >> f->chroma_h_shift;
373 const int cy = y >> f->chroma_v_shift;
374 decode_plane(fs, p->data[0] + ps * x + y * p->linesize[0], width,
375 height, p->linesize[0],
376 0);
377
378 if (f->chroma_planes) {
379 decode_plane(fs, p->data[1] + ps * cx + cy * p->linesize[1],
380 chroma_width, chroma_height, p->linesize[1],
381 1);
382 decode_plane(fs, p->data[2] + ps * cx + cy * p->linesize[2],
383 chroma_width, chroma_height, p->linesize[2],
384 1);
385 }
386 if (fs->transparency)
387 decode_plane(fs, p->data[3] + ps * x + y * p->linesize[3], width,
388 height, p->linesize[3],
389 2);
390 } else {
391 uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],
392 p->data[1] + ps * x + y * p->linesize[1],
393 p->data[2] + ps * x + y * p->linesize[2] };
394 decode_rgb_frame(fs, planes, width, height, p->linesize);
395 }
396 if (fs->ac && f->version > 2) {
397 int v;
398 get_rac(&fs->c, (uint8_t[]) { 129 });
399 v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5 * f->ec;
400 if (v) {
401 av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n",
402 v);
403 fs->slice_damaged = 1;
404 }
405 }
406
407 emms_c();
408
409 return 0;
410 }
411
412 static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
413 {
414 int v;
415 int i = 0;
416 uint8_t state[CONTEXT_SIZE];
417
418 memset(state, 128, sizeof(state));
419
420 for (v = 0; i < 128; v++) {
421 unsigned len = get_symbol(c, state, 0) + 1;
422
423 if (len > 128 - i)
424 return -1;
425
426 while (len--) {
427 quant_table[i] = scale * v;
428 i++;
429 }
430 }
431
432 for (i = 1; i < 128; i++)
433 quant_table[256 - i] = -quant_table[i];
434 quant_table[128] = -quant_table[127];
435
436 return 2 * v - 1;
437 }
438
439 static int read_quant_tables(RangeCoder *c,
440 int16_t quant_table[MAX_CONTEXT_INPUTS][256])
441 {
442 int i;
443 int context_count = 1;
444
445 for (i = 0; i < 5; i++) {
446 context_count *= read_quant_table(c, quant_table[i], context_count);
447 if (context_count > 32768U) {
448 return -1;
449 }
450 }
451 return (context_count + 1) / 2;
452 }
453
454 static int read_extra_header(FFV1Context *f)
455 {
456 RangeCoder *const c = &f->c;
457 uint8_t state[CONTEXT_SIZE];
458 int i, j, k, ret;
459 uint8_t state2[32][CONTEXT_SIZE];
460
461 memset(state2, 128, sizeof(state2));
462 memset(state, 128, sizeof(state));
463
464 ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);
465 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
466
467 f->version = get_symbol(c, state, 0);
468 if (f->version > 2) {
469 c->bytestream_end -= 4;
470 f->minor_version = get_symbol(c, state, 0);
471 }
472 f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
473
474 if (f->ac > 1) {
475 for (i = 1; i < 256; i++)
476 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
477 }
478
479 f->colorspace = get_symbol(c, state, 0); //YUV cs type
480 f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
481 f->chroma_planes = get_rac(c, state);
482 f->chroma_h_shift = get_symbol(c, state, 0);
483 f->chroma_v_shift = get_symbol(c, state, 0);
484 f->transparency = get_rac(c, state);
485 f->plane_count = 2 + f->transparency;
486 f->num_h_slices = 1 + get_symbol(c, state, 0);
487 f->num_v_slices = 1 + get_symbol(c, state, 0);
488
489 if (f->num_h_slices > (unsigned)f->width ||
490 f->num_v_slices > (unsigned)f->height) {
491 av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");
492 return AVERROR_INVALIDDATA;
493 }
494
495 f->quant_table_count = get_symbol(c, state, 0);
496 if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
497 return AVERROR_INVALIDDATA;
498 for (i = 0; i < f->quant_table_count; i++) {
499 f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);
500 if (f->context_count[i] < 0) {
501 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
502 return AVERROR_INVALIDDATA;
503 }
504 }
505 if ((ret = ffv1_allocate_initial_states(f)) < 0)
506 return ret;
507
508 for (i = 0; i < f->quant_table_count; i++)
509 if (get_rac(c, state)) {
510 for (j = 0; j < f->context_count[i]; j++)
511 for (k = 0; k < CONTEXT_SIZE; k++) {
512 int pred = j ? f->initial_states[i][j - 1][k] : 128;
513 f->initial_states[i][j][k] =
514 (pred + get_symbol(c, state2[k], 1)) & 0xFF;
515 }
516 }
517
518 if (f->version > 2) {
519 f->ec = get_symbol(c, state, 0);
520 }
521
522 if (f->version > 2) {
523 unsigned v;
524 v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,
525 f->avctx->extradata, f->avctx->extradata_size);
526 if (v) {
527 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
528 return AVERROR_INVALIDDATA;
529 }
530 }
531
532 return 0;
533 }
534
535
536 static int read_header(FFV1Context *f)
537 {
538 uint8_t state[CONTEXT_SIZE];
539 int i, j, context_count = -1;
540 RangeCoder *const c = &f->slice_context[0]->c;
541
542 memset(state, 128, sizeof(state));
543
544 if (f->version < 2) {
545 unsigned v = get_symbol(c, state, 0);
546 if (v > 1) {
547 av_log(f->avctx, AV_LOG_ERROR,
548 "invalid version %d in version 1 header\n", v);
549 return AVERROR_INVALIDDATA;
550 }
551 f->version = v;
552
553 f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
554
555 if (f->ac > 1) {
556 for (i = 1; i < 256; i++)
557 f->state_transition[i] =
558 get_symbol(c, state, 1) + c->one_state[i];
559 }
560
561 f->colorspace = get_symbol(c, state, 0); //YUV cs type
562
563 if (f->version > 0)
564 f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
565
566 f->chroma_planes = get_rac(c, state);
567 f->chroma_h_shift = get_symbol(c, state, 0);
568 f->chroma_v_shift = get_symbol(c, state, 0);
569 f->transparency = get_rac(c, state);
570 f->plane_count = 2 + f->transparency;
571 }
572
573 if (f->colorspace == 0) {
574 if (!f->transparency && !f->chroma_planes) {
575 if (f->avctx->bits_per_raw_sample <= 8)
576 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
577 else
578 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
579 } else if (f->avctx->bits_per_raw_sample <= 8 && !f->transparency) {
580 switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
581 case 0x00:
582 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P;
583 break;
584 case 0x01:
585 f->avctx->pix_fmt = AV_PIX_FMT_YUV440P;
586 break;
587 case 0x10:
588 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
589 break;
590 case 0x11:
591 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P;
592 break;
593 case 0x20:
594 f->avctx->pix_fmt = AV_PIX_FMT_YUV411P;
595 break;
596 case 0x22:
597 f->avctx->pix_fmt = AV_PIX_FMT_YUV410P;
598 break;
599 default:
600 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
601 return AVERROR(ENOSYS);
602 }
603 } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
604 switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
605 case 0x00:
606 f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
607 break;
608 case 0x10:
609 f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
610 break;
611 case 0x11:
612 f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
613 break;
614 default:
615 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
616 return AVERROR(ENOSYS);
617 }
618 } else if (f->avctx->bits_per_raw_sample == 9) {
619 f->packed_at_lsb = 1;
620 switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
621 case 0x00:
622 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
623 break;
624 case 0x10:
625 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
626 break;
627 case 0x11:
628 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
629 break;
630 default:
631 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
632 return AVERROR(ENOSYS);
633 }
634 } else if (f->avctx->bits_per_raw_sample == 10) {
635 f->packed_at_lsb = 1;
636 switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
637 case 0x00:
638 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
639 break;
640 case 0x10:
641 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
642 break;
643 case 0x11:
644 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
645 break;
646 default:
647 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
648 return AVERROR(ENOSYS);
649 }
650 } else {
651 switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
652 case 0x00:
653 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
654 break;
655 case 0x10:
656 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
657 break;
658 case 0x11:
659 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
660 break;
661 default:
662 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
663 return AVERROR(ENOSYS);
664 }
665 }
666 } else if (f->colorspace == 1) {
667 if (f->chroma_h_shift || f->chroma_v_shift) {
668 av_log(f->avctx, AV_LOG_ERROR,
669 "chroma subsampling not supported in this colorspace\n");
670 return AVERROR(ENOSYS);
671 }
672 switch (f->avctx->bits_per_raw_sample) {
673 case 8:
674 f->avctx->pix_fmt = AV_PIX_FMT_RGB32;
675 break;
676 case 9:
677 f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;
678 break;
679 case 10:
680 f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
681 break;
682 default:
683 av_log(f->avctx, AV_LOG_ERROR,
684 "bit depth %d not supported\n",
685 f->avctx->bits_per_raw_sample);
686 return AVERROR(ENOSYS);
687 }
688 } else {
689 av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
690 return AVERROR(ENOSYS);
691 }
692
693 av_dlog(f->avctx, "%d %d %d\n",
694 f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);
695 if (f->version < 2) {
696 context_count = read_quant_tables(c, f->quant_table);
697 if (context_count < 0) {
698 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
699 return AVERROR_INVALIDDATA;
700 }
701 } else if (f->version < 3) {
702 f->slice_count = get_symbol(c, state, 0);
703 } else {
704 const uint8_t *p = c->bytestream_end;
705 for (f->slice_count = 0;
706 f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;
707 f->slice_count++) {
708 int trailer = 3 + 5 * !!f->ec;
709 int size = AV_RB24(p - trailer);
710 if (size + trailer > p - c->bytestream_start)
711 break;
712 p -= size + trailer;
713 }
714 }
715 if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {
716 av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n",
717 f->slice_count);
718 return AVERROR_INVALIDDATA;
719 }
720
721 for (j = 0; j < f->slice_count; j++) {
722 FFV1Context *fs = f->slice_context[j];
723 fs->ac = f->ac;
724 fs->packed_at_lsb = f->packed_at_lsb;
725
726 fs->slice_damaged = 0;
727
728 if (f->version == 2) {
729 fs->slice_x = get_symbol(c, state, 0) * f->width;
730 fs->slice_y = get_symbol(c, state, 0) * f->height;
731 fs->slice_width =
732 (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;
733 fs->slice_height =
734 (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
735
736 fs->slice_x /= f->num_h_slices;
737 fs->slice_y /= f->num_v_slices;
738 fs->slice_width /= f->num_h_slices - fs->slice_x;
739 fs->slice_height /= f->num_v_slices - fs->slice_y;
740 if ((unsigned)fs->slice_width > f->width ||
741 (unsigned)fs->slice_height > f->height)
742 return AVERROR_INVALIDDATA;
743 if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width
744 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height >
745 f->height)
746 return AVERROR_INVALIDDATA;
747 }
748
749 for (i = 0; i < f->plane_count; i++) {
750 PlaneContext *const p = &fs->plane[i];
751
752 if (f->version == 2) {
753 int idx = get_symbol(c, state, 0);
754 if (idx > (unsigned)f->quant_table_count) {
755 av_log(f->avctx, AV_LOG_ERROR,
756 "quant_table_index out of range\n");
757 return AVERROR_INVALIDDATA;
758 }
759 p->quant_table_index = idx;
760 memcpy(p->quant_table, f->quant_tables[idx],
761 sizeof(p->quant_table));
762 context_count = f->context_count[idx];
763 } else {
764 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));
765 }
766
767 if (f->version <= 2) {
768 av_assert0(context_count >= 0);
769 if (p->context_count < context_count) {
770 av_freep(&p->state);
771 av_freep(&p->vlc_state);
772 }
773 p->context_count = context_count;
774 }
775 }
776 }
777 return 0;
778 }
779
780 static av_cold int ffv1_decode_init(AVCodecContext *avctx)
781 {
782 FFV1Context *f = avctx->priv_data;
783 int ret;
784
785 ffv1_common_init(avctx);
786
787 if (avctx->extradata && (ret = read_extra_header(f)) < 0)
788 return ret;
789
790 if ((ret = ffv1_init_slice_contexts(f)) < 0)
791 return ret;
792
793 return 0;
794 }
795
796 static int ffv1_decode_frame(AVCodecContext *avctx, void *data,
797 int *data_size, AVPacket *avpkt)
798 {
799 const uint8_t *buf = avpkt->data;
800 int buf_size = avpkt->size;
801 FFV1Context *f = avctx->priv_data;
802 RangeCoder *const c = &f->slice_context[0]->c;
803 AVFrame *const p = &f->picture;
804 int i, ret;
805 uint8_t keystate = 128;
806 const uint8_t *buf_p;
807
808 AVFrame *picture = data;
809
810 /* release previously stored data */
811 if (p->data[0])
812 avctx->release_buffer(avctx, p);
813
814 ff_init_range_decoder(c, buf, buf_size);
815 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
816
817 p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
818 if (get_rac(c, &keystate)) {
819 p->key_frame = 1;
820 f->key_frame_ok = 0;
821 if ((ret = read_header(f)) < 0)
822 return ret;
823 f->key_frame_ok = 1;
824 } else {
825 if (!f->key_frame_ok) {
826 av_log(avctx, AV_LOG_ERROR,
827 "Cant decode non keyframe without valid keyframe\n");
828 return AVERROR_INVALIDDATA;
829 }
830 p->key_frame = 0;
831 }
832
833 p->reference = 3; //for error concealment
834 if ((ret = ff_get_buffer(avctx, p)) < 0) {
835 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
836 return ret;
837 }
838
839 if (avctx->debug & FF_DEBUG_PICT_INFO)
840 av_log(avctx, AV_LOG_DEBUG,
841 "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
842 f->version, p->key_frame, f->ac, f->ec, f->slice_count,
843 f->avctx->bits_per_raw_sample);
844
845 buf_p = buf + buf_size;
846 for (i = f->slice_count - 1; i >= 0; i--) {
847 FFV1Context *fs = f->slice_context[i];
848 int trailer = 3 + 5 * !!f->ec;
849 int v;
850
851 if (i || f->version > 2)
852 v = AV_RB24(buf_p - trailer) + trailer;
853 else
854 v = buf_p - c->bytestream_start;
855 if (buf_p - c->bytestream_start < v) {
856 av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
857 return AVERROR_INVALIDDATA;
858 }
859 buf_p -= v;
860
861 if (f->ec) {
862 unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);
863 if (crc) {
864 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", crc);
865 fs->slice_damaged = 1;
866 }
867 }
868
869 if (i) {
870 ff_init_range_decoder(&fs->c, buf_p, v);
871 } else
872 fs->c.bytestream_end = (uint8_t *)(buf_p + v);
873 }
874
875 avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL,
876 f->slice_count,
877 sizeof(void *));
878
879 for (i = f->slice_count - 1; i >= 0; i--) {
880 FFV1Context *fs = f->slice_context[i];
881 int j;
882 if (fs->slice_damaged && f->last_picture.data[0]) {
883 const uint8_t *src[4];
884 uint8_t *dst[4];
885 for (j = 0; j < 4; j++) {
886 int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;
887 int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;
888 dst[j] = f->picture.data[j] + f->picture.linesize[j] *
889 (fs->slice_y >> sv) + (fs->slice_x >> sh);
890 src[j] = f->last_picture.data[j] +
891 f->last_picture.linesize[j] *
892 (fs->slice_y >> sv) + (fs->slice_x >> sh);
893 }
894 av_image_copy(dst, f->picture.linesize, (const uint8_t **)src,
895 f->last_picture.linesize,
896 avctx->pix_fmt, fs->slice_width,
897 fs->slice_height);
898 }
899 }
900
901 f->picture_number++;
902
903 *picture = *p;
904 *data_size = sizeof(AVFrame);
905
906 FFSWAP(AVFrame, f->picture, f->last_picture);
907
908 return buf_size;
909 }
910
911 AVCodec ff_ffv1_decoder = {
912 .name = "ffv1",
913 .type = AVMEDIA_TYPE_VIDEO,
914 .id = AV_CODEC_ID_FFV1,
915 .priv_data_size = sizeof(FFV1Context),
916 .init = ffv1_decode_init,
917 .close = ffv1_close,
918 .decode = ffv1_decode_frame,
919 .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |
920 CODEC_CAP_SLICE_THREADS,
921 .long_name = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
922 };