4 * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg 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.
13 * FFmpeg 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * FF Video Codec 1 (a lossless codec) decoder
28 #include "libavutil/avassert.h"
29 #include "libavutil/crc.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/timer.h"
37 #include "rangecoder.h"
42 static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
45 if (get_rac(c, state + 0))
50 while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10
54 for (i = e - 1; i >= 0; i--)
55 a += a + get_rac(c, state + 22 + FFMIN(i, 9)); // 22..31
57 e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21
62 static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
64 return get_symbol_inline(c, state, is_signed);
67 static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
74 while (i < state->error_sum) { // FIXME: optimize
79 v = get_sr_golomb(gb, k, 12, bits);
80 av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
81 v, state->bias, state->error_sum, state->drift, state->count, k);
84 if (k == 0 && 2 * state->drift <= -state->count)
87 v ^= ((2 * state->drift + state->count) >> 31);
90 ret = fold(v + state->bias, bits);
92 update_vlc_state(state, v);
97 static av_always_inline void decode_line(FFV1Context *s, int w,
99 int plane_index, int bits)
101 PlaneContext *const p = &s->plane[plane_index];
102 RangeCoder *const c = &s->c;
106 int run_index = s->run_index;
108 for (x = 0; x < w; x++) {
109 int diff, context, sign;
111 context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);
118 av_assert2(context < p->context_count);
121 diff = get_symbol_inline(c, p->state[context], 1);
123 if (context == 0 && run_mode == 0)
127 if (run_count == 0 && run_mode == 1) {
128 if (get_bits1(&s->gb)) {
129 run_count = 1 << ff_log2_run[run_index];
130 if (x + run_count <= w)
133 if (ff_log2_run[run_index])
134 run_count = get_bits(&s->gb, ff_log2_run[run_index]);
146 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],
153 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
155 av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
156 run_count, run_index, run_mode, x, get_bits_count(&s->gb));
162 sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &
165 s->run_index = run_index;
168 static void decode_plane(FFV1Context *s, uint8_t *src,
169 int w, int h, int stride, int plane_index)
173 sample[0] = s->sample_buffer + 3;
174 sample[1] = s->sample_buffer + w + 6 + 3;
178 memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));
180 for (y = 0; y < h; y++) {
181 int16_t *temp = sample[0]; // FIXME: try a normal buffer
183 sample[0] = sample[1];
186 sample[1][-1] = sample[0][0];
187 sample[0][w] = sample[0][w - 1];
190 if (s->avctx->bits_per_raw_sample <= 8) {
191 decode_line(s, w, sample, plane_index, 8);
192 for (x = 0; x < w; x++)
193 src[x + stride * y] = sample[1][x];
195 decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);
196 if (s->packed_at_lsb) {
197 for (x = 0; x < w; x++) {
198 ((uint16_t*)(src + stride*y))[x] = sample[1][x];
201 for (x = 0; x < w; x++) {
202 ((uint16_t*)(src + stride*y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);
206 // STOP_TIMER("decode-line") }
210 static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])
213 int16_t *sample[4][2];
214 int lbd = s->avctx->bits_per_raw_sample <= 8;
215 int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;
216 int offset = 1 << bits;
218 for (x = 0; x < 4; x++) {
219 sample[x][0] = s->sample_buffer + x * 2 * (w + 6) + 3;
220 sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;
225 memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));
227 for (y = 0; y < h; y++) {
228 for (p = 0; p < 3 + s->transparency; p++) {
229 int16_t *temp = sample[p][0]; // FIXME: try a normal buffer
231 sample[p][0] = sample[p][1];
234 sample[p][1][-1]= sample[p][0][0 ];
235 sample[p][0][ w]= sample[p][0][w-1];
237 decode_line(s, w, sample[p], (p + 1)/2, 9);
239 decode_line(s, w, sample[p], (p + 1)/2, bits + 1);
241 for (x = 0; x < w; x++) {
242 int g = sample[0][1][x];
243 int b = sample[1][1][x];
244 int r = sample[2][1][x];
245 int a = sample[3][1][x];
254 *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
256 *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;
257 *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;
258 *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
264 static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
266 RangeCoder *c = &fs->c;
267 uint8_t state[CONTEXT_SIZE];
268 unsigned ps, i, context_count;
269 memset(state, 128, sizeof(state));
271 av_assert0(f->version > 2);
273 fs->slice_x = get_symbol(c, state, 0) * f->width ;
274 fs->slice_y = get_symbol(c, state, 0) * f->height;
275 fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;
276 fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
278 fs->slice_x /= f->num_h_slices;
279 fs->slice_y /= f->num_v_slices;
280 fs->slice_width = fs->slice_width /f->num_h_slices - fs->slice_x;
281 fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;
282 if ((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)
284 if ( (unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width
285 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
288 for (i = 0; i < f->plane_count; i++) {
289 PlaneContext * const p = &fs->plane[i];
290 int idx = get_symbol(c, state, 0);
291 if (idx > (unsigned)f->quant_table_count) {
292 av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
295 p->quant_table_index = idx;
296 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));
297 context_count = f->context_count[idx];
299 if (p->context_count < context_count) {
301 av_freep(&p->vlc_state);
303 p->context_count = context_count;
306 ps = get_symbol(c, state, 0);
308 f->cur->interlaced_frame = 1;
309 f->cur->top_field_first = 1;
310 } else if (ps == 2) {
311 f->cur->interlaced_frame = 1;
312 f->cur->top_field_first = 0;
313 } else if (ps == 3) {
314 f->cur->interlaced_frame = 0;
316 f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);
317 f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);
322 static int decode_slice(AVCodecContext *c, void *arg)
324 FFV1Context *fs = *(void **)arg;
325 FFV1Context *f = fs->avctx->priv_data;
326 int width, height, x, y, ret;
327 const int ps = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step_minus1 + 1;
328 AVFrame * const p = f->cur;
330 if (f->version > 2) {
331 if (ffv1_init_slice_state(f, fs) < 0)
332 return AVERROR(ENOMEM);
333 if (decode_slice_header(f, fs) < 0) {
334 fs->slice_damaged = 1;
335 return AVERROR_INVALIDDATA;
338 if ((ret = ffv1_init_slice_state(f, fs)) < 0)
340 if (f->cur->key_frame)
341 ffv1_clear_slice_state(f, fs);
343 width = fs->slice_width;
344 height = fs->slice_height;
349 if (f->version == 3 && f->minor_version > 1 || f->version > 3)
350 get_rac(&fs->c, (uint8_t[]) { 129 });
351 fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;
352 init_get_bits(&fs->gb,
353 fs->c.bytestream_start + fs->ac_byte_count,
354 (fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count) * 8);
357 av_assert1(width && height);
358 if (f->colorspace == 0) {
359 const int chroma_width = -((-width) >> f->chroma_h_shift);
360 const int chroma_height = -((-height) >> f->chroma_v_shift);
361 const int cx = x >> f->chroma_h_shift;
362 const int cy = y >> f->chroma_v_shift;
363 decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);
365 if (f->chroma_planes) {
366 decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);
367 decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);
369 if (fs->transparency)
370 decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);
372 uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],
373 p->data[1] + ps * x + y * p->linesize[1],
374 p->data[2] + ps * x + y * p->linesize[2] };
375 decode_rgb_frame(fs, planes, width, height, p->linesize);
377 if (fs->ac && f->version > 2) {
379 get_rac(&fs->c, (uint8_t[]) { 129 });
380 v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5*f->ec;
382 av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);
383 fs->slice_damaged = 1;
392 static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
396 uint8_t state[CONTEXT_SIZE];
398 memset(state, 128, sizeof(state));
400 for (v = 0; i < 128; v++) {
401 unsigned len = get_symbol(c, state, 0) + 1;
404 return AVERROR_INVALIDDATA;
407 quant_table[i] = scale * v;
412 for (i = 1; i < 128; i++)
413 quant_table[256 - i] = -quant_table[i];
414 quant_table[128] = -quant_table[127];
419 static int read_quant_tables(RangeCoder *c,
420 int16_t quant_table[MAX_CONTEXT_INPUTS][256])
423 int context_count = 1;
425 for (i = 0; i < 5; i++) {
426 context_count *= read_quant_table(c, quant_table[i], context_count);
427 if (context_count > 32768U) {
428 return AVERROR_INVALIDDATA;
431 return (context_count + 1) / 2;
434 static int read_extra_header(FFV1Context *f)
436 RangeCoder *const c = &f->c;
437 uint8_t state[CONTEXT_SIZE];
439 uint8_t state2[32][CONTEXT_SIZE];
441 memset(state2, 128, sizeof(state2));
442 memset(state, 128, sizeof(state));
444 ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);
445 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
447 f->version = get_symbol(c, state, 0);
448 if (f->version > 2) {
449 c->bytestream_end -= 4;
450 f->minor_version = get_symbol(c, state, 0);
452 f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
454 for (i = 1; i < 256; i++)
455 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
458 f->colorspace = get_symbol(c, state, 0); //YUV cs type
459 f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
460 f->chroma_planes = get_rac(c, state);
461 f->chroma_h_shift = get_symbol(c, state, 0);
462 f->chroma_v_shift = get_symbol(c, state, 0);
463 f->transparency = get_rac(c, state);
464 f->plane_count = 2 + f->transparency;
465 f->num_h_slices = 1 + get_symbol(c, state, 0);
466 f->num_v_slices = 1 + get_symbol(c, state, 0);
468 if (f->num_h_slices > (unsigned)f->width || !f->num_h_slices ||
469 f->num_v_slices > (unsigned)f->height || !f->num_v_slices
471 av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");
472 return AVERROR_INVALIDDATA;
475 f->quant_table_count = get_symbol(c, state, 0);
476 if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
477 return AVERROR_INVALIDDATA;
479 for (i = 0; i < f->quant_table_count; i++) {
480 f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);
481 if (f->context_count[i] < 0) {
482 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
483 return AVERROR_INVALIDDATA;
486 if ((ret = ffv1_allocate_initial_states(f)) < 0)
489 for (i = 0; i < f->quant_table_count; i++)
490 if (get_rac(c, state)) {
491 for (j = 0; j < f->context_count[i]; j++)
492 for (k = 0; k < CONTEXT_SIZE; k++) {
493 int pred = j ? f->initial_states[i][j - 1][k] : 128;
494 f->initial_states[i][j][k] =
495 (pred + get_symbol(c, state2[k], 1)) & 0xFF;
499 if (f->version > 2) {
500 f->ec = get_symbol(c, state, 0);
503 if (f->version > 2) {
505 v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,
506 f->avctx->extradata, f->avctx->extradata_size);
508 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
509 return AVERROR_INVALIDDATA;
516 static int read_header(FFV1Context *f)
518 uint8_t state[CONTEXT_SIZE];
519 int i, j, context_count = -1; //-1 to avoid warning
520 RangeCoder *const c = &f->slice_context[0]->c;
522 memset(state, 128, sizeof(state));
524 if (f->version < 2) {
525 unsigned v= get_symbol(c, state, 0);
527 av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);
528 return AVERROR_INVALIDDATA;
531 f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
533 for (i = 1; i < 256; i++)
534 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
537 f->colorspace = get_symbol(c, state, 0); //YUV cs type
540 f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
542 f->chroma_planes = get_rac(c, state);
543 f->chroma_h_shift = get_symbol(c, state, 0);
544 f->chroma_v_shift = get_symbol(c, state, 0);
545 f->transparency = get_rac(c, state);
546 f->plane_count = 2 + f->transparency;
549 if (f->colorspace == 0) {
550 if (!f->transparency && !f->chroma_planes) {
551 if (f->avctx->bits_per_raw_sample <= 8)
552 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
554 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
555 } else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {
556 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
557 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P; break;
558 case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P; break;
559 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P; break;
560 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P; break;
561 case 0x20: f->avctx->pix_fmt = AV_PIX_FMT_YUV411P; break;
562 case 0x22: f->avctx->pix_fmt = AV_PIX_FMT_YUV410P; break;
564 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
565 return AVERROR(ENOSYS);
567 } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
568 switch(16*f->chroma_h_shift + f->chroma_v_shift) {
569 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P; break;
570 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; break;
571 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P; break;
573 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
574 return AVERROR(ENOSYS);
576 } else if (f->avctx->bits_per_raw_sample == 9) {
577 f->packed_at_lsb = 1;
578 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
579 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9; break;
580 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9; break;
581 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9; break;
583 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
584 return AVERROR(ENOSYS);
586 } else if (f->avctx->bits_per_raw_sample == 10) {
587 f->packed_at_lsb = 1;
588 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
589 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10; break;
590 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10; break;
591 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10; break;
593 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
594 return AVERROR(ENOSYS);
597 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
598 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16; break;
599 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16; break;
600 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16; break;
602 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
603 return AVERROR(ENOSYS);
606 } else if (f->colorspace == 1) {
607 if (f->chroma_h_shift || f->chroma_v_shift) {
608 av_log(f->avctx, AV_LOG_ERROR,
609 "chroma subsampling not supported in this colorspace\n");
610 return AVERROR(ENOSYS);
612 if ( f->avctx->bits_per_raw_sample == 9)
613 f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;
614 else if (f->avctx->bits_per_raw_sample == 10)
615 f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
616 else if (f->avctx->bits_per_raw_sample == 12)
617 f->avctx->pix_fmt = AV_PIX_FMT_GBRP12;
618 else if (f->avctx->bits_per_raw_sample == 14)
619 f->avctx->pix_fmt = AV_PIX_FMT_GBRP14;
621 if (f->transparency) f->avctx->pix_fmt = AV_PIX_FMT_RGB32;
622 else f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;
624 av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
625 return AVERROR(ENOSYS);
628 av_dlog(f->avctx, "%d %d %d\n",
629 f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);
630 if (f->version < 2) {
631 context_count = read_quant_tables(c, f->quant_table);
632 if (context_count < 0) {
633 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
634 return AVERROR_INVALIDDATA;
636 } else if (f->version < 3) {
637 f->slice_count = get_symbol(c, state, 0);
639 const uint8_t *p = c->bytestream_end;
640 for (f->slice_count = 0;
641 f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;
643 int trailer = 3 + 5*!!f->ec;
644 int size = AV_RB24(p-trailer);
645 if (size + trailer > p - c->bytestream_start)
650 if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {
651 av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n", f->slice_count);
652 return AVERROR_INVALIDDATA;
655 for (j = 0; j < f->slice_count; j++) {
656 FFV1Context *fs = f->slice_context[j];
658 fs->packed_at_lsb = f->packed_at_lsb;
660 fs->slice_damaged = 0;
662 if (f->version == 2) {
663 fs->slice_x = get_symbol(c, state, 0) * f->width ;
664 fs->slice_y = get_symbol(c, state, 0) * f->height;
665 fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;
666 fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
668 fs->slice_x /= f->num_h_slices;
669 fs->slice_y /= f->num_v_slices;
670 fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x;
671 fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;
672 if ((unsigned)fs->slice_width > f->width ||
673 (unsigned)fs->slice_height > f->height)
674 return AVERROR_INVALIDDATA;
675 if ( (unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width
676 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
677 return AVERROR_INVALIDDATA;
680 for (i = 0; i < f->plane_count; i++) {
681 PlaneContext *const p = &fs->plane[i];
683 if (f->version == 2) {
684 int idx = get_symbol(c, state, 0);
685 if (idx > (unsigned)f->quant_table_count) {
686 av_log(f->avctx, AV_LOG_ERROR,
687 "quant_table_index out of range\n");
688 return AVERROR_INVALIDDATA;
690 p->quant_table_index = idx;
691 memcpy(p->quant_table, f->quant_tables[idx],
692 sizeof(p->quant_table));
693 context_count = f->context_count[idx];
695 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));
698 if (f->version <= 2) {
699 av_assert0(context_count >= 0);
700 if (p->context_count < context_count) {
702 av_freep(&p->vlc_state);
704 p->context_count = context_count;
711 static av_cold int decode_init(AVCodecContext *avctx)
713 FFV1Context *f = avctx->priv_data;
716 if ((ret = ffv1_common_init(avctx)) < 0)
719 if (avctx->extradata && (ret = read_extra_header(f)) < 0)
722 if ((ret = ffv1_init_slice_contexts(f)) < 0)
728 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
730 const uint8_t *buf = avpkt->data;
731 int buf_size = avpkt->size;
732 FFV1Context *f = avctx->priv_data;
733 RangeCoder *const c = &f->slice_context[0]->c;
735 uint8_t keystate = 128;
736 const uint8_t *buf_p;
737 AVFrame *const p = data;
741 ff_init_range_decoder(c, buf, buf_size);
742 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
744 p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
745 if (get_rac(c, &keystate)) {
748 if ((ret = read_header(f)) < 0)
752 if (!f->key_frame_ok) {
753 av_log(avctx, AV_LOG_ERROR,
754 "Cannot decode non-keyframe without valid keyframe\n");
755 return AVERROR_INVALIDDATA;
760 if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0)
763 if (avctx->debug & FF_DEBUG_PICT_INFO)
764 av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
765 f->version, p->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);
767 buf_p = buf + buf_size;
768 for (i = f->slice_count - 1; i >= 0; i--) {
769 FFV1Context *fs = f->slice_context[i];
770 int trailer = 3 + 5*!!f->ec;
773 if (i || f->version > 2) v = AV_RB24(buf_p-trailer) + trailer;
774 else v = buf_p - c->bytestream_start;
775 if (buf_p - c->bytestream_start < v) {
776 av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
777 return AVERROR_INVALIDDATA;
782 unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);
784 int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;
785 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!", crc);
786 if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {
787 av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));
788 } else if (ts != AV_NOPTS_VALUE) {
789 av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);
791 av_log(f->avctx, AV_LOG_ERROR, "\n");
793 fs->slice_damaged = 1;
798 ff_init_range_decoder(&fs->c, buf_p, v);
800 fs->c.bytestream_end = (uint8_t *)(buf_p + v);
805 avctx->execute(avctx,
807 &f->slice_context[0],
812 for (i = f->slice_count - 1; i >= 0; i--) {
813 FFV1Context *fs = f->slice_context[i];
815 if (fs->slice_damaged && f->last_picture.data[0]) {
816 const uint8_t *src[4];
818 for (j = 0; j < 4; j++) {
819 int sh = (j==1 || j==2) ? f->chroma_h_shift : 0;
820 int sv = (j==1 || j==2) ? f->chroma_v_shift : 0;
821 dst[j] = p->data[j] + p->linesize[j]*
822 (fs->slice_y>>sv) + (fs->slice_x>>sh);
823 src[j] = f->last_picture.data[j] + f->last_picture.linesize[j]*
824 (fs->slice_y>>sv) + (fs->slice_x>>sh);
826 av_image_copy(dst, p->linesize, (const uint8_t **)src,
827 f->last_picture.linesize,
836 av_frame_unref(&f->last_picture);
837 if ((ret = av_frame_ref(&f->last_picture, p)) < 0)
846 AVCodec ff_ffv1_decoder = {
848 .type = AVMEDIA_TYPE_VIDEO,
849 .id = AV_CODEC_ID_FFV1,
850 .priv_data_size = sizeof(FFV1Context),
853 .decode = decode_frame,
854 .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |
855 CODEC_CAP_SLICE_THREADS,
856 .long_name = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),