a148825d1e91c72cf57cfa62975f232f4a327163
[libav.git] / libavcodec / h264dec.c
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 * H.264 / AVC / MPEG-4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "libavutil/display.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/stereo3d.h"
32 #include "libavutil/timer.h"
33 #include "internal.h"
34 #include "bytestream.h"
35 #include "cabac.h"
36 #include "cabac_functions.h"
37 #include "error_resilience.h"
38 #include "avcodec.h"
39 #include "h264.h"
40 #include "h264dec.h"
41 #include "h2645_parse.h"
42 #include "h264data.h"
43 #include "h264chroma.h"
44 #include "h264_mvpred.h"
45 #include "h264_ps.h"
46 #include "golomb.h"
47 #include "mathops.h"
48 #include "me_cmp.h"
49 #include "mpegutils.h"
50 #include "profiles.h"
51 #include "rectangle.h"
52 #include "thread.h"
53
54 #include <assert.h>
55
56 const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
57
58 static void h264_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
59 int (*mv)[2][4][2],
60 int mb_x, int mb_y, int mb_intra, int mb_skipped)
61 {
62 H264Context *h = opaque;
63 H264SliceContext *sl = &h->slice_ctx[0];
64
65 sl->mb_x = mb_x;
66 sl->mb_y = mb_y;
67 sl->mb_xy = mb_x + mb_y * h->mb_stride;
68 memset(sl->non_zero_count_cache, 0, sizeof(sl->non_zero_count_cache));
69 assert(ref >= 0);
70 /* FIXME: It is possible albeit uncommon that slice references
71 * differ between slices. We take the easy approach and ignore
72 * it for now. If this turns out to have any relevance in
73 * practice then correct remapping should be added. */
74 if (ref >= sl->ref_count[0])
75 ref = 0;
76 fill_rectangle(&h->cur_pic.ref_index[0][4 * sl->mb_xy],
77 2, 2, 2, ref, 1);
78 fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
79 fill_rectangle(sl->mv_cache[0][scan8[0]], 4, 4, 8,
80 pack16to32((*mv)[0][0][0], (*mv)[0][0][1]), 4);
81 assert(!FRAME_MBAFF(h));
82 ff_h264_hl_decode_mb(h, &h->slice_ctx[0]);
83 }
84
85 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl,
86 int y, int height)
87 {
88 AVCodecContext *avctx = h->avctx;
89 const AVFrame *src = h->cur_pic.f;
90 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
91 int vshift = desc->log2_chroma_h;
92 const int field_pic = h->picture_structure != PICT_FRAME;
93 if (field_pic) {
94 height <<= 1;
95 y <<= 1;
96 }
97
98 height = FFMIN(height, avctx->height - y);
99
100 if (field_pic && h->first_field && !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
101 return;
102
103 if (avctx->draw_horiz_band) {
104 int offset[AV_NUM_DATA_POINTERS];
105 int i;
106
107 offset[0] = y * src->linesize[0];
108 offset[1] =
109 offset[2] = (y >> vshift) * src->linesize[1];
110 for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
111 offset[i] = 0;
112
113 emms_c();
114
115 avctx->draw_horiz_band(avctx, src, offset,
116 y, h->picture_structure, height);
117 }
118 }
119
120 void ff_h264_free_tables(H264Context *h)
121 {
122 int i;
123
124 av_freep(&h->intra4x4_pred_mode);
125 av_freep(&h->chroma_pred_mode_table);
126 av_freep(&h->cbp_table);
127 av_freep(&h->mvd_table[0]);
128 av_freep(&h->mvd_table[1]);
129 av_freep(&h->direct_table);
130 av_freep(&h->non_zero_count);
131 av_freep(&h->slice_table_base);
132 h->slice_table = NULL;
133 av_freep(&h->list_counts);
134
135 av_freep(&h->mb2b_xy);
136 av_freep(&h->mb2br_xy);
137
138 av_buffer_pool_uninit(&h->qscale_table_pool);
139 av_buffer_pool_uninit(&h->mb_type_pool);
140 av_buffer_pool_uninit(&h->motion_val_pool);
141 av_buffer_pool_uninit(&h->ref_index_pool);
142
143 for (i = 0; i < h->nb_slice_ctx; i++) {
144 H264SliceContext *sl = &h->slice_ctx[i];
145
146 av_freep(&sl->dc_val_base);
147 av_freep(&sl->er.mb_index2xy);
148 av_freep(&sl->er.error_status_table);
149 av_freep(&sl->er.er_temp_buffer);
150
151 av_freep(&sl->bipred_scratchpad);
152 av_freep(&sl->edge_emu_buffer);
153 av_freep(&sl->top_borders[0]);
154 av_freep(&sl->top_borders[1]);
155
156 sl->bipred_scratchpad_allocated = 0;
157 sl->edge_emu_buffer_allocated = 0;
158 sl->top_borders_allocated[0] = 0;
159 sl->top_borders_allocated[1] = 0;
160 }
161 }
162
163 int ff_h264_alloc_tables(H264Context *h)
164 {
165 const int big_mb_num = h->mb_stride * (h->mb_height + 1);
166 const int row_mb_num = h->mb_stride * 2 * h->nb_slice_ctx;
167 int x, y;
168
169 FF_ALLOCZ_OR_GOTO(h->avctx, h->intra4x4_pred_mode,
170 row_mb_num * 8 * sizeof(uint8_t), fail)
171 h->slice_ctx[0].intra4x4_pred_mode = h->intra4x4_pred_mode;
172
173 FF_ALLOCZ_OR_GOTO(h->avctx, h->non_zero_count,
174 big_mb_num * 48 * sizeof(uint8_t), fail)
175 FF_ALLOCZ_OR_GOTO(h->avctx, h->slice_table_base,
176 (big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base), fail)
177 FF_ALLOCZ_OR_GOTO(h->avctx, h->cbp_table,
178 big_mb_num * sizeof(uint16_t), fail)
179 FF_ALLOCZ_OR_GOTO(h->avctx, h->chroma_pred_mode_table,
180 big_mb_num * sizeof(uint8_t), fail)
181 FF_ALLOCZ_OR_GOTO(h->avctx, h->mvd_table[0],
182 16 * row_mb_num * sizeof(uint8_t), fail);
183 FF_ALLOCZ_OR_GOTO(h->avctx, h->mvd_table[1],
184 16 * row_mb_num * sizeof(uint8_t), fail);
185 h->slice_ctx[0].mvd_table[0] = h->mvd_table[0];
186 h->slice_ctx[0].mvd_table[1] = h->mvd_table[1];
187
188 FF_ALLOCZ_OR_GOTO(h->avctx, h->direct_table,
189 4 * big_mb_num * sizeof(uint8_t), fail);
190 FF_ALLOCZ_OR_GOTO(h->avctx, h->list_counts,
191 big_mb_num * sizeof(uint8_t), fail)
192
193 memset(h->slice_table_base, -1,
194 (big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base));
195 h->slice_table = h->slice_table_base + h->mb_stride * 2 + 1;
196
197 FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2b_xy,
198 big_mb_num * sizeof(uint32_t), fail);
199 FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2br_xy,
200 big_mb_num * sizeof(uint32_t), fail);
201 for (y = 0; y < h->mb_height; y++)
202 for (x = 0; x < h->mb_width; x++) {
203 const int mb_xy = x + y * h->mb_stride;
204 const int b_xy = 4 * x + 4 * y * h->b_stride;
205
206 h->mb2b_xy[mb_xy] = b_xy;
207 h->mb2br_xy[mb_xy] = 8 * (FMO ? mb_xy : (mb_xy % (2 * h->mb_stride)));
208 }
209
210 return 0;
211
212 fail:
213 ff_h264_free_tables(h);
214 return AVERROR(ENOMEM);
215 }
216
217 /**
218 * Init context
219 * Allocate buffers which are not shared amongst multiple threads.
220 */
221 int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl)
222 {
223 ERContext *er = &sl->er;
224 int mb_array_size = h->mb_height * h->mb_stride;
225 int y_size = (2 * h->mb_width + 1) * (2 * h->mb_height + 1);
226 int c_size = h->mb_stride * (h->mb_height + 1);
227 int yc_size = y_size + 2 * c_size;
228 int x, y, i;
229
230 sl->ref_cache[0][scan8[5] + 1] =
231 sl->ref_cache[0][scan8[7] + 1] =
232 sl->ref_cache[0][scan8[13] + 1] =
233 sl->ref_cache[1][scan8[5] + 1] =
234 sl->ref_cache[1][scan8[7] + 1] =
235 sl->ref_cache[1][scan8[13] + 1] = PART_NOT_AVAILABLE;
236
237 if (CONFIG_ERROR_RESILIENCE) {
238 /* init ER */
239 er->avctx = h->avctx;
240 er->decode_mb = h264_er_decode_mb;
241 er->opaque = h;
242 er->quarter_sample = 1;
243
244 er->mb_num = h->mb_num;
245 er->mb_width = h->mb_width;
246 er->mb_height = h->mb_height;
247 er->mb_stride = h->mb_stride;
248 er->b8_stride = h->mb_width * 2 + 1;
249
250 // error resilience code looks cleaner with this
251 FF_ALLOCZ_OR_GOTO(h->avctx, er->mb_index2xy,
252 (h->mb_num + 1) * sizeof(int), fail);
253
254 for (y = 0; y < h->mb_height; y++)
255 for (x = 0; x < h->mb_width; x++)
256 er->mb_index2xy[x + y * h->mb_width] = x + y * h->mb_stride;
257
258 er->mb_index2xy[h->mb_height * h->mb_width] = (h->mb_height - 1) *
259 h->mb_stride + h->mb_width;
260
261 FF_ALLOCZ_OR_GOTO(h->avctx, er->error_status_table,
262 mb_array_size * sizeof(uint8_t), fail);
263
264 FF_ALLOC_OR_GOTO(h->avctx, er->er_temp_buffer,
265 h->mb_height * h->mb_stride, fail);
266
267 FF_ALLOCZ_OR_GOTO(h->avctx, sl->dc_val_base,
268 yc_size * sizeof(int16_t), fail);
269 er->dc_val[0] = sl->dc_val_base + h->mb_width * 2 + 2;
270 er->dc_val[1] = sl->dc_val_base + y_size + h->mb_stride + 1;
271 er->dc_val[2] = er->dc_val[1] + c_size;
272 for (i = 0; i < yc_size; i++)
273 sl->dc_val_base[i] = 1024;
274 }
275
276 return 0;
277
278 fail:
279 return AVERROR(ENOMEM); // ff_h264_free_tables will clean up for us
280 }
281
282 static int h264_init_context(AVCodecContext *avctx, H264Context *h)
283 {
284 int i;
285
286 h->avctx = avctx;
287
288 h->picture_structure = PICT_FRAME;
289 h->workaround_bugs = avctx->workaround_bugs;
290 h->flags = avctx->flags;
291 h->poc.prev_poc_msb = 1 << 16;
292 h->recovery_frame = -1;
293 h->frame_recovered = 0;
294
295 h->next_outputed_poc = INT_MIN;
296 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
297 h->last_pocs[i] = INT_MIN;
298
299 ff_h264_sei_uninit(&h->sei);
300
301 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
302
303 h->nb_slice_ctx = (avctx->active_thread_type & FF_THREAD_SLICE) ? avctx->thread_count : 1;
304 h->slice_ctx = av_mallocz_array(h->nb_slice_ctx, sizeof(*h->slice_ctx));
305 if (!h->slice_ctx) {
306 h->nb_slice_ctx = 0;
307 return AVERROR(ENOMEM);
308 }
309
310 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
311 h->DPB[i].f = av_frame_alloc();
312 if (!h->DPB[i].f)
313 return AVERROR(ENOMEM);
314 }
315
316 h->cur_pic.f = av_frame_alloc();
317 if (!h->cur_pic.f)
318 return AVERROR(ENOMEM);
319
320 for (i = 0; i < h->nb_slice_ctx; i++)
321 h->slice_ctx[i].h264 = h;
322
323 return 0;
324 }
325
326 static av_cold int h264_decode_end(AVCodecContext *avctx)
327 {
328 H264Context *h = avctx->priv_data;
329 int i;
330
331 ff_h264_free_tables(h);
332
333 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
334 ff_h264_unref_picture(h, &h->DPB[i]);
335 av_frame_free(&h->DPB[i].f);
336 }
337
338 h->cur_pic_ptr = NULL;
339
340 av_freep(&h->slice_ctx);
341 h->nb_slice_ctx = 0;
342
343 for (i = 0; i < MAX_SPS_COUNT; i++)
344 av_buffer_unref(&h->ps.sps_list[i]);
345
346 for (i = 0; i < MAX_PPS_COUNT; i++)
347 av_buffer_unref(&h->ps.pps_list[i]);
348
349 ff_h2645_packet_uninit(&h->pkt);
350
351 ff_h264_unref_picture(h, &h->cur_pic);
352 av_frame_free(&h->cur_pic.f);
353
354 return 0;
355 }
356
357 static AVOnce h264_vlc_init = AV_ONCE_INIT;
358
359 av_cold int ff_h264_decode_init(AVCodecContext *avctx)
360 {
361 H264Context *h = avctx->priv_data;
362 int ret;
363
364 ret = h264_init_context(avctx, h);
365 if (ret < 0)
366 return ret;
367
368 ret = ff_thread_once(&h264_vlc_init, ff_h264_decode_init_vlc);
369 if (ret != 0) {
370 av_log(avctx, AV_LOG_ERROR, "pthread_once has failed.");
371 return AVERROR_UNKNOWN;
372 }
373
374 if (avctx->ticks_per_frame == 1)
375 h->avctx->framerate.num *= 2;
376 avctx->ticks_per_frame = 2;
377
378 if (avctx->extradata_size > 0 && avctx->extradata) {
379 ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
380 &h->ps, &h->is_avc, &h->nal_length_size,
381 avctx->err_recognition, avctx);
382 if (ret < 0) {
383 h264_decode_end(avctx);
384 return ret;
385 }
386 }
387
388 if (h->ps.sps && h->ps.sps->bitstream_restriction_flag &&
389 h->avctx->has_b_frames < h->ps.sps->num_reorder_frames) {
390 h->avctx->has_b_frames = h->ps.sps->num_reorder_frames;
391 }
392
393 avctx->internal->allocate_progress = 1;
394
395 if (h->enable_er) {
396 av_log(avctx, AV_LOG_WARNING,
397 "Error resilience is enabled. It is unsafe and unsupported and may crash. "
398 "Use it at your own risk\n");
399 }
400
401 return 0;
402 }
403
404 static int decode_init_thread_copy(AVCodecContext *avctx)
405 {
406 H264Context *h = avctx->priv_data;
407 int ret;
408
409 if (!avctx->internal->is_copy)
410 return 0;
411
412 memset(h, 0, sizeof(*h));
413
414 ret = h264_init_context(avctx, h);
415 if (ret < 0)
416 return ret;
417
418 h->context_initialized = 0;
419
420 return 0;
421 }
422
423 /**
424 * Run setup operations that must be run after slice header decoding.
425 * This includes finding the next displayed frame.
426 *
427 * @param h h264 master context
428 * @param setup_finished enough NALs have been read that we can call
429 * ff_thread_finish_setup()
430 */
431 static void decode_postinit(H264Context *h, int setup_finished)
432 {
433 const SPS *sps = h->ps.sps;
434 H264Picture *out = h->cur_pic_ptr;
435 H264Picture *cur = h->cur_pic_ptr;
436 int i, pics, out_of_order, out_idx;
437 int invalid = 0, cnt = 0;
438
439 if (h->next_output_pic)
440 return;
441
442 if (cur->field_poc[0] == INT_MAX || cur->field_poc[1] == INT_MAX) {
443 /* FIXME: if we have two PAFF fields in one packet, we can't start
444 * the next thread here. If we have one field per packet, we can.
445 * The check in decode_nal_units() is not good enough to find this
446 * yet, so we assume the worst for now. */
447 // if (setup_finished)
448 // ff_thread_finish_setup(h->avctx);
449 return;
450 }
451
452 // FIXME do something with unavailable reference frames
453
454 /* Sort B-frames into display order */
455 if (sps->bitstream_restriction_flag ||
456 h->avctx->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
457 h->avctx->has_b_frames = FFMAX(h->avctx->has_b_frames, sps->num_reorder_frames);
458 }
459
460 pics = 0;
461 while (h->delayed_pic[pics])
462 pics++;
463
464 assert(pics <= MAX_DELAYED_PIC_COUNT);
465
466 h->delayed_pic[pics++] = cur;
467 if (cur->reference == 0)
468 cur->reference = DELAYED_PIC_REF;
469
470 /* Frame reordering. This code takes pictures from coding order and sorts
471 * them by their incremental POC value into display order. It supports POC
472 * gaps, MMCO reset codes and random resets.
473 * A "display group" can start either with a IDR frame (f.key_frame = 1),
474 * and/or can be closed down with a MMCO reset code. In sequences where
475 * there is no delay, we can't detect that (since the frame was already
476 * output to the user), so we also set h->mmco_reset to detect the MMCO
477 * reset code.
478 * FIXME: if we detect insufficient delays (as per h->avctx->has_b_frames),
479 * we increase the delay between input and output. All frames affected by
480 * the lag (e.g. those that should have been output before another frame
481 * that we already returned to the user) will be dropped. This is a bug
482 * that we will fix later. */
483 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++) {
484 cnt += out->poc < h->last_pocs[i];
485 invalid += out->poc == INT_MIN;
486 }
487 if (!h->mmco_reset && !cur->f->key_frame &&
488 cnt + invalid == MAX_DELAYED_PIC_COUNT && cnt > 0) {
489 h->mmco_reset = 2;
490 if (pics > 1)
491 h->delayed_pic[pics - 2]->mmco_reset = 2;
492 }
493 if (h->mmco_reset || cur->f->key_frame) {
494 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
495 h->last_pocs[i] = INT_MIN;
496 cnt = 0;
497 invalid = MAX_DELAYED_PIC_COUNT;
498 }
499 out = h->delayed_pic[0];
500 out_idx = 0;
501 for (i = 1; i < MAX_DELAYED_PIC_COUNT &&
502 h->delayed_pic[i] &&
503 !h->delayed_pic[i - 1]->mmco_reset &&
504 !h->delayed_pic[i]->f->key_frame;
505 i++)
506 if (h->delayed_pic[i]->poc < out->poc) {
507 out = h->delayed_pic[i];
508 out_idx = i;
509 }
510 if (h->avctx->has_b_frames == 0 &&
511 (h->delayed_pic[0]->f->key_frame || h->mmco_reset))
512 h->next_outputed_poc = INT_MIN;
513 out_of_order = !out->f->key_frame && !h->mmco_reset &&
514 (out->poc < h->next_outputed_poc);
515
516 if (sps->bitstream_restriction_flag &&
517 h->avctx->has_b_frames >= sps->num_reorder_frames) {
518 } else if (out_of_order && pics - 1 == h->avctx->has_b_frames &&
519 h->avctx->has_b_frames < MAX_DELAYED_PIC_COUNT) {
520 if (invalid + cnt < MAX_DELAYED_PIC_COUNT) {
521 h->avctx->has_b_frames = FFMAX(h->avctx->has_b_frames, cnt);
522 }
523 } else if (!h->avctx->has_b_frames &&
524 ((h->next_outputed_poc != INT_MIN &&
525 out->poc > h->next_outputed_poc + 2) ||
526 cur->f->pict_type == AV_PICTURE_TYPE_B)) {
527 h->avctx->has_b_frames++;
528 }
529
530 if (pics > h->avctx->has_b_frames) {
531 out->reference &= ~DELAYED_PIC_REF;
532 for (i = out_idx; h->delayed_pic[i]; i++)
533 h->delayed_pic[i] = h->delayed_pic[i + 1];
534 }
535 memmove(h->last_pocs, &h->last_pocs[1],
536 sizeof(*h->last_pocs) * (MAX_DELAYED_PIC_COUNT - 1));
537 h->last_pocs[MAX_DELAYED_PIC_COUNT - 1] = cur->poc;
538 if (!out_of_order && pics > h->avctx->has_b_frames) {
539 h->next_output_pic = out;
540 if (out->mmco_reset) {
541 if (out_idx > 0) {
542 h->next_outputed_poc = out->poc;
543 h->delayed_pic[out_idx - 1]->mmco_reset = out->mmco_reset;
544 } else {
545 h->next_outputed_poc = INT_MIN;
546 }
547 } else {
548 if (out_idx == 0 && pics > 1 && h->delayed_pic[0]->f->key_frame) {
549 h->next_outputed_poc = INT_MIN;
550 } else {
551 h->next_outputed_poc = out->poc;
552 }
553 }
554 h->mmco_reset = 0;
555 } else {
556 av_log(h->avctx, AV_LOG_DEBUG, "no picture\n");
557 }
558
559 if (h->next_output_pic) {
560 if (h->next_output_pic->recovered) {
561 // We have reached an recovery point and all frames after it in
562 // display order are "recovered".
563 h->frame_recovered |= FRAME_RECOVERED_SEI;
564 }
565 h->next_output_pic->recovered |= !!(h->frame_recovered & FRAME_RECOVERED_SEI);
566 }
567
568 if (setup_finished && !h->avctx->hwaccel) {
569 ff_thread_finish_setup(h->avctx);
570
571 if (h->avctx->active_thread_type & FF_THREAD_FRAME)
572 h->setup_finished = 1;
573 }
574 }
575
576 /**
577 * instantaneous decoder refresh.
578 */
579 static void idr(H264Context *h)
580 {
581 ff_h264_remove_all_refs(h);
582 h->poc.prev_frame_num =
583 h->poc.prev_frame_num_offset =
584 h->poc.prev_poc_msb =
585 h->poc.prev_poc_lsb = 0;
586 }
587
588 /* forget old pics after a seek */
589 void ff_h264_flush_change(H264Context *h)
590 {
591 int i;
592 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
593 h->last_pocs[i] = INT_MIN;
594 h->next_outputed_poc = INT_MIN;
595 h->prev_interlaced_frame = 1;
596 idr(h);
597 if (h->cur_pic_ptr)
598 h->cur_pic_ptr->reference = 0;
599 h->first_field = 0;
600 ff_h264_sei_uninit(&h->sei);
601 h->recovery_frame = -1;
602 h->frame_recovered = 0;
603 }
604
605 /* forget old pics after a seek */
606 static void flush_dpb(AVCodecContext *avctx)
607 {
608 H264Context *h = avctx->priv_data;
609 int i;
610
611 memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
612
613 ff_h264_flush_change(h);
614
615 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
616 ff_h264_unref_picture(h, &h->DPB[i]);
617 h->cur_pic_ptr = NULL;
618 ff_h264_unref_picture(h, &h->cur_pic);
619
620 h->mb_y = 0;
621
622 ff_h264_free_tables(h);
623 h->context_initialized = 0;
624 }
625
626 static int get_last_needed_nal(H264Context *h)
627 {
628 int nals_needed = 0;
629 int i;
630
631 for (i = 0; i < h->pkt.nb_nals; i++) {
632 H2645NAL *nal = &h->pkt.nals[i];
633 GetBitContext gb;
634
635 /* packets can sometimes contain multiple PPS/SPS,
636 * e.g. two PAFF field pictures in one packet, or a demuxer
637 * which splits NALs strangely if so, when frame threading we
638 * can't start the next thread until we've read all of them */
639 switch (nal->type) {
640 case H264_NAL_SPS:
641 case H264_NAL_PPS:
642 nals_needed = i;
643 break;
644 case H264_NAL_DPA:
645 case H264_NAL_IDR_SLICE:
646 case H264_NAL_SLICE:
647 init_get_bits(&gb, nal->data + 1, (nal->size - 1) * 8);
648 if (!get_ue_golomb(&gb))
649 nals_needed = i;
650 }
651 }
652
653 return nals_needed;
654 }
655
656 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
657 {
658 AVCodecContext *const avctx = h->avctx;
659 unsigned context_count = 0;
660 int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
661 int i, ret = 0;
662
663 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
664 h->current_slice = 0;
665 if (!h->first_field)
666 h->cur_pic_ptr = NULL;
667 ff_h264_sei_uninit(&h->sei);
668 }
669
670 ret = ff_h2645_packet_split(&h->pkt, buf, buf_size, avctx, h->is_avc,
671 h->nal_length_size, avctx->codec_id);
672 if (ret < 0) {
673 av_log(avctx, AV_LOG_ERROR,
674 "Error splitting the input into NAL units.\n");
675 return ret;
676 }
677
678 if (avctx->active_thread_type & FF_THREAD_FRAME)
679 nals_needed = get_last_needed_nal(h);
680
681 for (i = 0; i < h->pkt.nb_nals; i++) {
682 H2645NAL *nal = &h->pkt.nals[i];
683 H264SliceContext *sl = &h->slice_ctx[context_count];
684 int err;
685
686 if (avctx->skip_frame >= AVDISCARD_NONREF &&
687 nal->ref_idc == 0 && nal->type != H264_NAL_SEI)
688 continue;
689
690 // FIXME these should stop being context-global variables
691 h->nal_ref_idc = nal->ref_idc;
692 h->nal_unit_type = nal->type;
693
694 err = 0;
695 switch (nal->type) {
696 case H264_NAL_IDR_SLICE:
697 idr(h); // FIXME ensure we don't lose some frames if there is reordering
698 case H264_NAL_SLICE:
699 sl->gb = nal->gb;
700
701 if ((err = ff_h264_decode_slice_header(h, sl, nal)))
702 break;
703
704 if (sl->redundant_pic_count > 0)
705 break;
706
707 if (h->current_slice == 1) {
708 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS))
709 decode_postinit(h, i >= nals_needed);
710 }
711
712 if ((avctx->skip_frame < AVDISCARD_NONREF || nal->ref_idc) &&
713 (avctx->skip_frame < AVDISCARD_BIDIR ||
714 sl->slice_type_nos != AV_PICTURE_TYPE_B) &&
715 (avctx->skip_frame < AVDISCARD_NONKEY ||
716 h->cur_pic_ptr->f->key_frame) &&
717 avctx->skip_frame < AVDISCARD_ALL) {
718 if (avctx->hwaccel) {
719 ret = avctx->hwaccel->decode_slice(avctx, nal->raw_data, nal->raw_size);
720 if (ret < 0)
721 return ret;
722 } else
723 context_count++;
724 }
725 break;
726 case H264_NAL_DPA:
727 case H264_NAL_DPB:
728 case H264_NAL_DPC:
729 avpriv_request_sample(avctx, "data partitioning");
730 ret = AVERROR(ENOSYS);
731 goto end;
732 break;
733 case H264_NAL_SEI:
734 ret = ff_h264_sei_decode(&h->sei, &nal->gb, &h->ps, avctx);
735 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
736 goto end;
737 break;
738 case H264_NAL_SPS:
739 ret = ff_h264_decode_seq_parameter_set(&nal->gb, avctx, &h->ps);
740 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
741 goto end;
742 break;
743 case H264_NAL_PPS:
744 ret = ff_h264_decode_picture_parameter_set(&nal->gb, avctx, &h->ps,
745 nal->size_bits);
746 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
747 goto end;
748 break;
749 case H264_NAL_AUD:
750 case H264_NAL_END_SEQUENCE:
751 case H264_NAL_END_STREAM:
752 case H264_NAL_FILLER_DATA:
753 case H264_NAL_SPS_EXT:
754 case H264_NAL_AUXILIARY_SLICE:
755 break;
756 default:
757 av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
758 nal->type, nal->size_bits);
759 }
760
761 if (context_count == h->nb_slice_ctx) {
762 ret = ff_h264_execute_decode_slices(h, context_count);
763 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
764 goto end;
765 context_count = 0;
766 }
767
768 if (err < 0) {
769 av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
770 sl->ref_count[0] = sl->ref_count[1] = sl->list_count = 0;
771 }
772 }
773 if (context_count) {
774 ret = ff_h264_execute_decode_slices(h, context_count);
775 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
776 goto end;
777 }
778
779 ret = 0;
780 end:
781 /* clean up */
782 if (h->cur_pic_ptr && !h->droppable) {
783 ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
784 h->picture_structure == PICT_BOTTOM_FIELD);
785 }
786
787 return (ret < 0) ? ret : buf_size;
788 }
789
790 /**
791 * Return the number of bytes consumed for building the current frame.
792 */
793 static int get_consumed_bytes(int pos, int buf_size)
794 {
795 if (pos == 0)
796 pos = 1; // avoid infinite loops (I doubt that is needed but...)
797 if (pos + 10 > buf_size)
798 pos = buf_size; // oops ;)
799
800 return pos;
801 }
802
803 static int output_frame(H264Context *h, AVFrame *dst, AVFrame *src)
804 {
805 int i;
806 int ret = av_frame_ref(dst, src);
807 if (ret < 0)
808 return ret;
809
810 if (!h->ps.sps || !h->ps.sps->crop)
811 return 0;
812
813 for (i = 0; i < 3; i++) {
814 int hshift = (i > 0) ? h->chroma_x_shift : 0;
815 int vshift = (i > 0) ? h->chroma_y_shift : 0;
816 int off = ((h->ps.sps->crop_left >> hshift) << h->pixel_shift) +
817 (h->ps.sps->crop_top >> vshift) * dst->linesize[i];
818 dst->data[i] += off;
819 }
820 return 0;
821 }
822
823 static int h264_decode_frame(AVCodecContext *avctx, void *data,
824 int *got_frame, AVPacket *avpkt)
825 {
826 const uint8_t *buf = avpkt->data;
827 int buf_size = avpkt->size;
828 H264Context *h = avctx->priv_data;
829 AVFrame *pict = data;
830 int buf_index = 0;
831 int ret;
832 const uint8_t *new_extradata;
833 int new_extradata_size;
834
835 h->flags = avctx->flags;
836 h->setup_finished = 0;
837
838 /* end of stream, output what is still in the buffers */
839 out:
840 if (buf_size == 0) {
841 H264Picture *out;
842 int i, out_idx;
843
844 h->cur_pic_ptr = NULL;
845
846 // FIXME factorize this with the output code below
847 out = h->delayed_pic[0];
848 out_idx = 0;
849 for (i = 1;
850 h->delayed_pic[i] &&
851 !h->delayed_pic[i]->f->key_frame &&
852 !h->delayed_pic[i]->mmco_reset;
853 i++)
854 if (h->delayed_pic[i]->poc < out->poc) {
855 out = h->delayed_pic[i];
856 out_idx = i;
857 }
858
859 for (i = out_idx; h->delayed_pic[i]; i++)
860 h->delayed_pic[i] = h->delayed_pic[i + 1];
861
862 if (out) {
863 ret = output_frame(h, pict, out->f);
864 if (ret < 0)
865 return ret;
866 *got_frame = 1;
867 }
868
869 return buf_index;
870 }
871
872 new_extradata_size = 0;
873 new_extradata = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
874 &new_extradata_size);
875 if (new_extradata_size > 0 && new_extradata) {
876 ret = ff_h264_decode_extradata(new_extradata, new_extradata_size,
877 &h->ps, &h->is_avc, &h->nal_length_size,
878 avctx->err_recognition, avctx);
879 if (ret < 0)
880 return ret;
881 }
882
883 buf_index = decode_nal_units(h, buf, buf_size);
884 if (buf_index < 0)
885 return AVERROR_INVALIDDATA;
886
887 if (!h->cur_pic_ptr && h->nal_unit_type == H264_NAL_END_SEQUENCE) {
888 buf_size = 0;
889 goto out;
890 }
891
892 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) && !h->cur_pic_ptr) {
893 if (avctx->skip_frame >= AVDISCARD_NONREF)
894 return 0;
895 av_log(avctx, AV_LOG_ERROR, "no frame!\n");
896 return AVERROR_INVALIDDATA;
897 }
898
899 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) ||
900 (h->mb_y >= h->mb_height && h->mb_height)) {
901 if (avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)
902 decode_postinit(h, 1);
903
904 ff_h264_field_end(h, &h->slice_ctx[0], 0);
905
906 *got_frame = 0;
907 if (h->next_output_pic && ((avctx->flags & AV_CODEC_FLAG_OUTPUT_CORRUPT) ||
908 h->next_output_pic->recovered)) {
909 if (!h->next_output_pic->recovered)
910 h->next_output_pic->f->flags |= AV_FRAME_FLAG_CORRUPT;
911
912 ret = output_frame(h, pict, h->next_output_pic->f);
913 if (ret < 0)
914 return ret;
915 *got_frame = 1;
916 }
917 }
918
919 assert(pict->buf[0] || !*got_frame);
920
921 return get_consumed_bytes(buf_index, buf_size);
922 }
923
924 #define OFFSET(x) offsetof(H264Context, x)
925 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
926 static const AVOption h264_options[] = {
927 { "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
928 { NULL },
929 };
930
931 static const AVClass h264_class = {
932 .class_name = "h264",
933 .item_name = av_default_item_name,
934 .option = h264_options,
935 .version = LIBAVUTIL_VERSION_INT,
936 };
937
938 AVCodec ff_h264_decoder = {
939 .name = "h264",
940 .long_name = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
941 .type = AVMEDIA_TYPE_VIDEO,
942 .id = AV_CODEC_ID_H264,
943 .priv_data_size = sizeof(H264Context),
944 .init = ff_h264_decode_init,
945 .close = h264_decode_end,
946 .decode = h264_decode_frame,
947 .capabilities = /*AV_CODEC_CAP_DRAW_HORIZ_BAND |*/ AV_CODEC_CAP_DR1 |
948 AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS |
949 AV_CODEC_CAP_FRAME_THREADS,
950 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
951 .flush = flush_dpb,
952 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
953 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
954 .profiles = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
955 .priv_class = &h264_class,
956 };