2 * H.26L/H.264/AVC/JVT/14496-10/... decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of Libav.
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.
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.
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
24 * H.264 / AVC / MPEG-4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
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"
34 #include "bytestream.h"
36 #include "cabac_functions.h"
37 #include "error_resilience.h"
39 #include "golomb_legacy.h"
42 #include "h2645_parse.h"
44 #include "h264chroma.h"
45 #include "h264_mvpred.h"
49 #include "mpegutils.h"
51 #include "rectangle.h"
56 const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
58 static void h264_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
60 int mb_x, int mb_y, int mb_intra, int mb_skipped)
62 H264Context *h = opaque;
63 H264SliceContext *sl = &h->slice_ctx[0];
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));
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])
76 fill_rectangle(&h->cur_pic.ref_index[0][4 * sl->mb_xy],
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]);
85 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl,
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;
98 height = FFMIN(height, avctx->height - y);
100 if (field_pic && h->first_field && !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
103 if (avctx->draw_horiz_band) {
104 int offset[AV_NUM_DATA_POINTERS];
107 offset[0] = y * src->linesize[0];
109 offset[2] = (y >> vshift) * src->linesize[1];
110 for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
115 avctx->draw_horiz_band(avctx, src, offset,
116 y, h->picture_structure, height);
120 void ff_h264_free_tables(H264Context *h)
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);
135 av_freep(&h->mb2b_xy);
136 av_freep(&h->mb2br_xy);
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);
143 for (i = 0; i < h->nb_slice_ctx; i++) {
144 H264SliceContext *sl = &h->slice_ctx[i];
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);
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]);
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;
163 int ff_h264_alloc_tables(H264Context *h)
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;
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;
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];
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)
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;
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;
206 h->mb2b_xy[mb_xy] = b_xy;
207 h->mb2br_xy[mb_xy] = 8 * (FMO ? mb_xy : (mb_xy % (2 * h->mb_stride)));
213 ff_h264_free_tables(h);
214 return AVERROR(ENOMEM);
219 * Allocate buffers which are not shared amongst multiple threads.
221 int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl)
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;
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;
237 if (CONFIG_ERROR_RESILIENCE) {
239 er->avctx = h->avctx;
240 er->decode_mb = h264_er_decode_mb;
242 er->quarter_sample = 1;
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;
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);
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;
258 er->mb_index2xy[h->mb_height * h->mb_width] = (h->mb_height - 1) *
259 h->mb_stride + h->mb_width;
261 FF_ALLOCZ_OR_GOTO(h->avctx, er->error_status_table,
262 mb_array_size * sizeof(uint8_t), fail);
264 FF_ALLOC_OR_GOTO(h->avctx, er->er_temp_buffer,
265 h->mb_height * h->mb_stride, fail);
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;
279 return AVERROR(ENOMEM); // ff_h264_free_tables will clean up for us
282 static int h264_init_context(AVCodecContext *avctx, H264Context *h)
288 h->width_from_caller = avctx->width;
289 h->height_from_caller = avctx->height;
291 h->picture_structure = PICT_FRAME;
292 h->workaround_bugs = avctx->workaround_bugs;
293 h->flags = avctx->flags;
294 h->poc.prev_poc_msb = 1 << 16;
295 h->recovery_frame = -1;
296 h->frame_recovered = 0;
298 h->next_outputed_poc = INT_MIN;
299 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
300 h->last_pocs[i] = INT_MIN;
302 ff_h264_sei_uninit(&h->sei);
304 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
306 h->nb_slice_ctx = (avctx->active_thread_type & FF_THREAD_SLICE) ? avctx->thread_count : 1;
307 h->slice_ctx = av_mallocz_array(h->nb_slice_ctx, sizeof(*h->slice_ctx));
310 return AVERROR(ENOMEM);
313 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
314 h->DPB[i].f = av_frame_alloc();
316 return AVERROR(ENOMEM);
319 h->cur_pic.f = av_frame_alloc();
321 return AVERROR(ENOMEM);
323 h->output_frame = av_frame_alloc();
324 if (!h->output_frame)
325 return AVERROR(ENOMEM);
327 for (i = 0; i < h->nb_slice_ctx; i++)
328 h->slice_ctx[i].h264 = h;
333 static av_cold int h264_decode_end(AVCodecContext *avctx)
335 H264Context *h = avctx->priv_data;
338 ff_h264_free_tables(h);
340 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
341 ff_h264_unref_picture(h, &h->DPB[i]);
342 av_frame_free(&h->DPB[i].f);
345 h->cur_pic_ptr = NULL;
347 av_freep(&h->slice_ctx);
350 for (i = 0; i < MAX_SPS_COUNT; i++)
351 av_buffer_unref(&h->ps.sps_list[i]);
353 for (i = 0; i < MAX_PPS_COUNT; i++)
354 av_buffer_unref(&h->ps.pps_list[i]);
356 ff_h2645_packet_uninit(&h->pkt);
358 ff_h264_unref_picture(h, &h->cur_pic);
359 av_frame_free(&h->cur_pic.f);
360 av_frame_free(&h->output_frame);
365 static AVOnce h264_vlc_init = AV_ONCE_INIT;
367 static av_cold int h264_decode_init(AVCodecContext *avctx)
369 H264Context *h = avctx->priv_data;
372 ret = h264_init_context(avctx, h);
376 ret = ff_thread_once(&h264_vlc_init, ff_h264_decode_init_vlc);
378 av_log(avctx, AV_LOG_ERROR, "pthread_once has failed.");
379 return AVERROR_UNKNOWN;
382 if (avctx->ticks_per_frame == 1)
383 h->avctx->framerate.num *= 2;
384 avctx->ticks_per_frame = 2;
386 if (avctx->extradata_size > 0 && avctx->extradata) {
387 ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
388 &h->ps, &h->is_avc, &h->nal_length_size,
389 avctx->err_recognition, avctx);
391 h264_decode_end(avctx);
396 if (h->ps.sps && h->ps.sps->bitstream_restriction_flag &&
397 h->avctx->has_b_frames < h->ps.sps->num_reorder_frames) {
398 h->avctx->has_b_frames = h->ps.sps->num_reorder_frames;
401 avctx->internal->allocate_progress = 1;
404 av_log(avctx, AV_LOG_WARNING,
405 "Error resilience is enabled. It is unsafe and unsupported and may crash. "
406 "Use it at your own risk\n");
412 static int decode_init_thread_copy(AVCodecContext *avctx)
414 H264Context *h = avctx->priv_data;
417 if (!avctx->internal->is_copy)
420 memset(h, 0, sizeof(*h));
422 ret = h264_init_context(avctx, h);
426 h->context_initialized = 0;
432 * instantaneous decoder refresh.
434 static void idr(H264Context *h)
436 ff_h264_remove_all_refs(h);
437 h->poc.prev_frame_num =
438 h->poc.prev_frame_num_offset =
439 h->poc.prev_poc_msb =
440 h->poc.prev_poc_lsb = 0;
443 /* forget old pics after a seek */
444 void ff_h264_flush_change(H264Context *h)
447 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
448 h->last_pocs[i] = INT_MIN;
449 h->next_outputed_poc = INT_MIN;
450 h->prev_interlaced_frame = 1;
453 h->cur_pic_ptr->reference = 0;
455 h->recovery_frame = -1;
456 h->frame_recovered = 0;
459 /* forget old pics after a seek */
460 static void flush_dpb(AVCodecContext *avctx)
462 H264Context *h = avctx->priv_data;
465 memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
467 ff_h264_flush_change(h);
468 ff_h264_sei_uninit(&h->sei);
470 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
471 ff_h264_unref_picture(h, &h->DPB[i]);
472 h->cur_pic_ptr = NULL;
473 ff_h264_unref_picture(h, &h->cur_pic);
477 ff_h264_free_tables(h);
478 h->context_initialized = 0;
481 static int get_last_needed_nal(H264Context *h)
486 for (i = 0; i < h->pkt.nb_nals; i++) {
487 H2645NAL *nal = &h->pkt.nals[i];
490 /* packets can sometimes contain multiple PPS/SPS,
491 * e.g. two PAFF field pictures in one packet, or a demuxer
492 * which splits NALs strangely if so, when frame threading we
493 * can't start the next thread until we've read all of them */
500 case H264_NAL_IDR_SLICE:
502 ret = init_get_bits8(&gb, nal->data + 1, nal->size - 1);
504 av_log(h->avctx, AV_LOG_ERROR, "Invalid zero-sized VCL NAL unit\n");
505 if (h->avctx->err_recognition & AV_EF_EXPLODE)
510 if (!get_ue_golomb(&gb))
518 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
520 AVCodecContext *const avctx = h->avctx;
521 int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
524 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
525 h->current_slice = 0;
526 h->field_started = 0;
528 h->cur_pic_ptr = NULL;
529 ff_h264_sei_uninit(&h->sei);
532 ret = ff_h2645_packet_split(&h->pkt, buf, buf_size, avctx, h->is_avc,
533 h->nal_length_size, avctx->codec_id);
535 av_log(avctx, AV_LOG_ERROR,
536 "Error splitting the input into NAL units.\n");
538 /* There are samples in the wild with mp4-style extradata, but Annex B
539 * data in the packets. If we fail parsing the packet as mp4, try it again
541 if (h->is_avc && !(avctx->err_recognition & AV_EF_EXPLODE)) {
542 int err = ff_h2645_packet_split(&h->pkt, buf, buf_size, avctx, 0, 0,
545 av_log(avctx, AV_LOG_WARNING,
546 "The stream seems to contain AVCC extradata with Annex B "
547 "formatted data, which is invalid.");
557 if (avctx->active_thread_type & FF_THREAD_FRAME)
558 nals_needed = get_last_needed_nal(h);
560 for (i = 0; i < h->pkt.nb_nals; i++) {
561 H2645NAL *nal = &h->pkt.nals[i];
562 int max_slice_ctx, err;
564 if (avctx->skip_frame >= AVDISCARD_NONREF &&
565 nal->ref_idc == 0 && nal->type != H264_NAL_SEI)
568 // FIXME these should stop being context-global variables
569 h->nal_ref_idc = nal->ref_idc;
570 h->nal_unit_type = nal->type;
574 case H264_NAL_IDR_SLICE:
575 idr(h); // FIXME ensure we don't lose some frames if there is reordering
577 if ((err = ff_h264_queue_decode_slice(h, nal)))
580 if (avctx->active_thread_type & FF_THREAD_FRAME &&
581 i >= nals_needed && !h->setup_finished && h->cur_pic_ptr) {
582 ff_thread_finish_setup(avctx);
583 h->setup_finished = 1;
586 max_slice_ctx = avctx->hwaccel ? 1 : h->nb_slice_ctx;
587 if (h->nb_slice_ctx_queued == max_slice_ctx) {
588 if (avctx->hwaccel) {
589 ret = avctx->hwaccel->decode_slice(avctx, nal->raw_data, nal->raw_size);
590 h->nb_slice_ctx_queued = 0;
592 ret = ff_h264_execute_decode_slices(h);
593 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
600 avpriv_request_sample(avctx, "data partitioning");
601 ret = AVERROR(ENOSYS);
605 ret = ff_h264_sei_decode(&h->sei, &nal->gb, &h->ps, avctx);
606 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
610 ret = ff_h264_decode_seq_parameter_set(&nal->gb, avctx, &h->ps);
611 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
615 ret = ff_h264_decode_picture_parameter_set(&nal->gb, avctx, &h->ps,
617 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
621 case H264_NAL_END_SEQUENCE:
622 case H264_NAL_END_STREAM:
623 case H264_NAL_FILLER_DATA:
624 case H264_NAL_SPS_EXT:
625 case H264_NAL_AUXILIARY_SLICE:
628 av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
629 nal->type, nal->size_bits);
633 av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
637 ret = ff_h264_execute_decode_slices(h);
638 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
644 if (h->cur_pic_ptr && !h->droppable) {
645 ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
646 h->picture_structure == PICT_BOTTOM_FIELD);
649 return (ret < 0) ? ret : buf_size;
653 * Return the number of bytes consumed for building the current frame.
655 static int get_consumed_bytes(int pos, int buf_size)
658 pos = 1; // avoid infinite loops (I doubt that is needed but...)
659 if (pos + 10 > buf_size)
660 pos = buf_size; // oops ;)
665 static int h264_decode_frame(AVCodecContext *avctx, void *data,
666 int *got_frame, AVPacket *avpkt)
668 const uint8_t *buf = avpkt->data;
669 int buf_size = avpkt->size;
670 H264Context *h = avctx->priv_data;
671 AVFrame *pict = data;
674 const uint8_t *new_extradata;
675 int new_extradata_size;
677 h->flags = avctx->flags;
678 h->setup_finished = 0;
679 h->nb_slice_ctx_queued = 0;
681 /* end of stream, output what is still in the buffers */
687 h->cur_pic_ptr = NULL;
689 // FIXME factorize this with the output code below
690 out = h->delayed_pic[0];
694 !h->delayed_pic[i]->f->key_frame &&
695 !h->delayed_pic[i]->mmco_reset;
697 if (h->delayed_pic[i]->poc < out->poc) {
698 out = h->delayed_pic[i];
702 for (i = out_idx; h->delayed_pic[i]; i++)
703 h->delayed_pic[i] = h->delayed_pic[i + 1];
706 ret = av_frame_ref(pict, out->f);
715 new_extradata_size = 0;
716 new_extradata = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
717 &new_extradata_size);
718 if (new_extradata_size > 0 && new_extradata) {
719 ret = ff_h264_decode_extradata(new_extradata, new_extradata_size,
720 &h->ps, &h->is_avc, &h->nal_length_size,
721 avctx->err_recognition, avctx);
726 buf_index = decode_nal_units(h, buf, buf_size);
728 return AVERROR_INVALIDDATA;
730 if (!h->cur_pic_ptr && h->nal_unit_type == H264_NAL_END_SEQUENCE) {
735 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) && !h->cur_pic_ptr) {
736 if (avctx->skip_frame >= AVDISCARD_NONREF)
738 av_log(avctx, AV_LOG_ERROR, "no frame!\n");
739 return AVERROR_INVALIDDATA;
742 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) ||
743 (h->mb_y >= h->mb_height && h->mb_height)) {
744 if (h->field_started)
745 ff_h264_field_end(h, &h->slice_ctx[0], 0);
748 if (h->output_frame->buf[0]) {
749 ret = av_frame_ref(pict, h->output_frame);
750 av_frame_unref(h->output_frame);
757 assert(pict->buf[0] || !*got_frame);
759 return get_consumed_bytes(buf_index, buf_size);
762 #define OFFSET(x) offsetof(H264Context, x)
763 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
764 static const AVOption h264_options[] = {
765 { "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
769 static const AVClass h264_class = {
770 .class_name = "h264",
771 .item_name = av_default_item_name,
772 .option = h264_options,
773 .version = LIBAVUTIL_VERSION_INT,
776 AVCodec ff_h264_decoder = {
778 .long_name = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
779 .type = AVMEDIA_TYPE_VIDEO,
780 .id = AV_CODEC_ID_H264,
781 .priv_data_size = sizeof(H264Context),
782 .init = h264_decode_init,
783 .close = h264_decode_end,
784 .decode = h264_decode_frame,
785 .capabilities = /*AV_CODEC_CAP_DRAW_HORIZ_BAND |*/ AV_CODEC_CAP_DR1 |
786 AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS |
787 AV_CODEC_CAP_FRAME_THREADS,
788 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING,
790 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
791 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
792 .profiles = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
793 .priv_class = &h264_class,