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 FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 #define UNCHECKED_BITSTREAM_READER 1
30 #include "libavutil/avassert.h"
31 #include "libavutil/display.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/stereo3d.h"
35 #include "libavutil/timer.h"
37 #include "bytestream.h"
39 #include "cabac_functions.h"
40 #include "error_resilience.h"
44 #include "h2645_parse.h"
46 #include "h264chroma.h"
47 #include "h264_mvpred.h"
52 #include "mpegutils.h"
53 #include "mpeg4video.h"
55 #include "rectangle.h"
58 const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
60 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx)
62 H264Context *h = avctx->priv_data;
63 return h && h->ps.sps ? h->ps.sps->num_reorder_frames : 0;
66 static void h264_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
68 int mb_x, int mb_y, int mb_intra, int mb_skipped)
70 H264Context *h = opaque;
71 H264SliceContext *sl = &h->slice_ctx[0];
75 sl->mb_xy = mb_x + mb_y * h->mb_stride;
76 memset(sl->non_zero_count_cache, 0, sizeof(sl->non_zero_count_cache));
78 /* FIXME: It is possible albeit uncommon that slice references
79 * differ between slices. We take the easy approach and ignore
80 * it for now. If this turns out to have any relevance in
81 * practice then correct remapping should be added. */
82 if (ref >= sl->ref_count[0])
84 if (!sl->ref_list[0][ref].data[0]) {
85 av_log(h->avctx, AV_LOG_DEBUG, "Reference not available for error concealing\n");
88 if ((sl->ref_list[0][ref].reference&3) != 3) {
89 av_log(h->avctx, AV_LOG_DEBUG, "Reference invalid\n");
92 fill_rectangle(&h->cur_pic.ref_index[0][4 * sl->mb_xy],
94 fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
95 fill_rectangle(sl->mv_cache[0][scan8[0]], 4, 4, 8,
96 pack16to32((*mv)[0][0][0], (*mv)[0][0][1]), 4);
98 sl->mb_field_decoding_flag = 0;
99 ff_h264_hl_decode_mb(h, &h->slice_ctx[0]);
102 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl,
105 AVCodecContext *avctx = h->avctx;
106 const AVFrame *src = h->cur_pic.f;
107 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
108 int vshift = desc->log2_chroma_h;
109 const int field_pic = h->picture_structure != PICT_FRAME;
115 height = FFMIN(height, avctx->height - y);
117 if (field_pic && h->first_field && !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
120 if (avctx->draw_horiz_band) {
121 int offset[AV_NUM_DATA_POINTERS];
124 offset[0] = y * src->linesize[0];
126 offset[2] = (y >> vshift) * src->linesize[1];
127 for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
132 avctx->draw_horiz_band(avctx, src, offset,
133 y, h->picture_structure, height);
137 void ff_h264_free_tables(H264Context *h)
141 av_freep(&h->intra4x4_pred_mode);
142 av_freep(&h->chroma_pred_mode_table);
143 av_freep(&h->cbp_table);
144 av_freep(&h->mvd_table[0]);
145 av_freep(&h->mvd_table[1]);
146 av_freep(&h->direct_table);
147 av_freep(&h->non_zero_count);
148 av_freep(&h->slice_table_base);
149 h->slice_table = NULL;
150 av_freep(&h->list_counts);
152 av_freep(&h->mb2b_xy);
153 av_freep(&h->mb2br_xy);
155 av_buffer_pool_uninit(&h->qscale_table_pool);
156 av_buffer_pool_uninit(&h->mb_type_pool);
157 av_buffer_pool_uninit(&h->motion_val_pool);
158 av_buffer_pool_uninit(&h->ref_index_pool);
160 for (i = 0; i < h->nb_slice_ctx; i++) {
161 H264SliceContext *sl = &h->slice_ctx[i];
163 av_freep(&sl->dc_val_base);
164 av_freep(&sl->er.mb_index2xy);
165 av_freep(&sl->er.error_status_table);
166 av_freep(&sl->er.er_temp_buffer);
168 av_freep(&sl->bipred_scratchpad);
169 av_freep(&sl->edge_emu_buffer);
170 av_freep(&sl->top_borders[0]);
171 av_freep(&sl->top_borders[1]);
173 sl->bipred_scratchpad_allocated = 0;
174 sl->edge_emu_buffer_allocated = 0;
175 sl->top_borders_allocated[0] = 0;
176 sl->top_borders_allocated[1] = 0;
180 int ff_h264_alloc_tables(H264Context *h)
182 const int big_mb_num = h->mb_stride * (h->mb_height + 1);
183 const int row_mb_num = 2*h->mb_stride*FFMAX(h->nb_slice_ctx, 1);
186 FF_ALLOCZ_ARRAY_OR_GOTO(h->avctx, h->intra4x4_pred_mode,
187 row_mb_num, 8 * sizeof(uint8_t), fail)
188 h->slice_ctx[0].intra4x4_pred_mode = h->intra4x4_pred_mode;
190 FF_ALLOCZ_OR_GOTO(h->avctx, h->non_zero_count,
191 big_mb_num * 48 * sizeof(uint8_t), fail)
192 FF_ALLOCZ_OR_GOTO(h->avctx, h->slice_table_base,
193 (big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base), fail)
194 FF_ALLOCZ_OR_GOTO(h->avctx, h->cbp_table,
195 big_mb_num * sizeof(uint16_t), fail)
196 FF_ALLOCZ_OR_GOTO(h->avctx, h->chroma_pred_mode_table,
197 big_mb_num * sizeof(uint8_t), fail)
198 FF_ALLOCZ_ARRAY_OR_GOTO(h->avctx, h->mvd_table[0],
199 row_mb_num, 16 * sizeof(uint8_t), fail);
200 FF_ALLOCZ_ARRAY_OR_GOTO(h->avctx, h->mvd_table[1],
201 row_mb_num, 16 * sizeof(uint8_t), fail);
202 h->slice_ctx[0].mvd_table[0] = h->mvd_table[0];
203 h->slice_ctx[0].mvd_table[1] = h->mvd_table[1];
205 FF_ALLOCZ_OR_GOTO(h->avctx, h->direct_table,
206 4 * big_mb_num * sizeof(uint8_t), fail);
207 FF_ALLOCZ_OR_GOTO(h->avctx, h->list_counts,
208 big_mb_num * sizeof(uint8_t), fail)
210 memset(h->slice_table_base, -1,
211 (big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base));
212 h->slice_table = h->slice_table_base + h->mb_stride * 2 + 1;
214 FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2b_xy,
215 big_mb_num * sizeof(uint32_t), fail);
216 FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2br_xy,
217 big_mb_num * sizeof(uint32_t), fail);
218 for (y = 0; y < h->mb_height; y++)
219 for (x = 0; x < h->mb_width; x++) {
220 const int mb_xy = x + y * h->mb_stride;
221 const int b_xy = 4 * x + 4 * y * h->b_stride;
223 h->mb2b_xy[mb_xy] = b_xy;
224 h->mb2br_xy[mb_xy] = 8 * (FMO ? mb_xy : (mb_xy % (2 * h->mb_stride)));
230 ff_h264_free_tables(h);
231 return AVERROR(ENOMEM);
236 * Allocate buffers which are not shared amongst multiple threads.
238 int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl)
240 ERContext *er = &sl->er;
241 int mb_array_size = h->mb_height * h->mb_stride;
242 int y_size = (2 * h->mb_width + 1) * (2 * h->mb_height + 1);
243 int c_size = h->mb_stride * (h->mb_height + 1);
244 int yc_size = y_size + 2 * c_size;
247 sl->ref_cache[0][scan8[5] + 1] =
248 sl->ref_cache[0][scan8[7] + 1] =
249 sl->ref_cache[0][scan8[13] + 1] =
250 sl->ref_cache[1][scan8[5] + 1] =
251 sl->ref_cache[1][scan8[7] + 1] =
252 sl->ref_cache[1][scan8[13] + 1] = PART_NOT_AVAILABLE;
254 if (sl != h->slice_ctx) {
255 memset(er, 0, sizeof(*er));
257 if (CONFIG_ERROR_RESILIENCE) {
260 er->avctx = h->avctx;
261 er->decode_mb = h264_er_decode_mb;
263 er->quarter_sample = 1;
265 er->mb_num = h->mb_num;
266 er->mb_width = h->mb_width;
267 er->mb_height = h->mb_height;
268 er->mb_stride = h->mb_stride;
269 er->b8_stride = h->mb_width * 2 + 1;
271 // error resilience code looks cleaner with this
272 FF_ALLOCZ_OR_GOTO(h->avctx, er->mb_index2xy,
273 (h->mb_num + 1) * sizeof(int), fail);
275 for (y = 0; y < h->mb_height; y++)
276 for (x = 0; x < h->mb_width; x++)
277 er->mb_index2xy[x + y * h->mb_width] = x + y * h->mb_stride;
279 er->mb_index2xy[h->mb_height * h->mb_width] = (h->mb_height - 1) *
280 h->mb_stride + h->mb_width;
282 FF_ALLOCZ_OR_GOTO(h->avctx, er->error_status_table,
283 mb_array_size * sizeof(uint8_t), fail);
285 FF_ALLOC_OR_GOTO(h->avctx, er->er_temp_buffer,
286 h->mb_height * h->mb_stride * (4*sizeof(int) + 1), fail);
288 FF_ALLOCZ_OR_GOTO(h->avctx, sl->dc_val_base,
289 yc_size * sizeof(int16_t), fail);
290 er->dc_val[0] = sl->dc_val_base + h->mb_width * 2 + 2;
291 er->dc_val[1] = sl->dc_val_base + y_size + h->mb_stride + 1;
292 er->dc_val[2] = er->dc_val[1] + c_size;
293 for (i = 0; i < yc_size; i++)
294 sl->dc_val_base[i] = 1024;
300 return AVERROR(ENOMEM); // ff_h264_free_tables will clean up for us
303 static int h264_init_context(AVCodecContext *avctx, H264Context *h)
308 h->cur_chroma_format_idc = -1;
310 h->width_from_caller = avctx->width;
311 h->height_from_caller = avctx->height;
313 h->picture_structure = PICT_FRAME;
314 h->workaround_bugs = avctx->workaround_bugs;
315 h->flags = avctx->flags;
316 h->poc.prev_poc_msb = 1 << 16;
317 h->recovery_frame = -1;
319 h->frame_recovered = 0;
320 h->poc.prev_frame_num = -1;
321 h->sei.frame_packing.frame_packing_arrangement_cancel_flag = -1;
322 h->sei.unregistered.x264_build = -1;
324 h->next_outputed_poc = INT_MIN;
325 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
326 h->last_pocs[i] = INT_MIN;
328 ff_h264_sei_uninit(&h->sei);
330 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
332 h->nb_slice_ctx = (avctx->active_thread_type & FF_THREAD_SLICE) ? avctx->thread_count : 1;
333 h->slice_ctx = av_mallocz_array(h->nb_slice_ctx, sizeof(*h->slice_ctx));
336 return AVERROR(ENOMEM);
339 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
340 h->DPB[i].f = av_frame_alloc();
342 return AVERROR(ENOMEM);
345 h->cur_pic.f = av_frame_alloc();
347 return AVERROR(ENOMEM);
349 h->last_pic_for_ec.f = av_frame_alloc();
350 if (!h->last_pic_for_ec.f)
351 return AVERROR(ENOMEM);
353 for (i = 0; i < h->nb_slice_ctx; i++)
354 h->slice_ctx[i].h264 = h;
359 static av_cold int h264_decode_end(AVCodecContext *avctx)
361 H264Context *h = avctx->priv_data;
364 ff_h264_remove_all_refs(h);
365 ff_h264_free_tables(h);
367 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
368 ff_h264_unref_picture(h, &h->DPB[i]);
369 av_frame_free(&h->DPB[i].f);
371 memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
373 h->cur_pic_ptr = NULL;
375 av_freep(&h->slice_ctx);
378 ff_h264_sei_uninit(&h->sei);
379 ff_h264_ps_uninit(&h->ps);
381 ff_h2645_packet_uninit(&h->pkt);
383 ff_h264_unref_picture(h, &h->cur_pic);
384 av_frame_free(&h->cur_pic.f);
385 ff_h264_unref_picture(h, &h->last_pic_for_ec);
386 av_frame_free(&h->last_pic_for_ec.f);
391 static AVOnce h264_vlc_init = AV_ONCE_INIT;
393 static av_cold int h264_decode_init(AVCodecContext *avctx)
395 H264Context *h = avctx->priv_data;
398 ret = h264_init_context(avctx, h);
402 ret = ff_thread_once(&h264_vlc_init, ff_h264_decode_init_vlc);
404 av_log(avctx, AV_LOG_ERROR, "pthread_once has failed.");
405 return AVERROR_UNKNOWN;
408 if (avctx->ticks_per_frame == 1) {
409 if(h->avctx->time_base.den < INT_MAX/2) {
410 h->avctx->time_base.den *= 2;
412 h->avctx->time_base.num /= 2;
414 avctx->ticks_per_frame = 2;
416 if (avctx->extradata_size > 0 && avctx->extradata) {
417 ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
418 &h->ps, &h->is_avc, &h->nal_length_size,
419 avctx->err_recognition, avctx);
421 h264_decode_end(avctx);
426 if (h->ps.sps && h->ps.sps->bitstream_restriction_flag &&
427 h->avctx->has_b_frames < h->ps.sps->num_reorder_frames) {
428 h->avctx->has_b_frames = h->ps.sps->num_reorder_frames;
431 avctx->internal->allocate_progress = 1;
433 ff_h264_flush_change(h);
435 if (h->enable_er < 0 && (avctx->active_thread_type & FF_THREAD_SLICE))
438 if (h->enable_er && (avctx->active_thread_type & FF_THREAD_SLICE)) {
439 av_log(avctx, AV_LOG_WARNING,
440 "Error resilience with slice threads is enabled. It is unsafe and unsupported and may crash. "
441 "Use it at your own risk\n");
448 static int decode_init_thread_copy(AVCodecContext *avctx)
450 H264Context *h = avctx->priv_data;
453 if (!avctx->internal->is_copy)
456 memset(h, 0, sizeof(*h));
458 ret = h264_init_context(avctx, h);
462 h->context_initialized = 0;
469 * instantaneous decoder refresh.
471 static void idr(H264Context *h)
474 ff_h264_remove_all_refs(h);
475 h->poc.prev_frame_num =
476 h->poc.prev_frame_num_offset = 0;
477 h->poc.prev_poc_msb = 1<<16;
478 h->poc.prev_poc_lsb = 0;
479 for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
480 h->last_pocs[i] = INT_MIN;
483 /* forget old pics after a seek */
484 void ff_h264_flush_change(H264Context *h)
488 h->next_outputed_poc = INT_MIN;
489 h->prev_interlaced_frame = 1;
492 h->poc.prev_frame_num = -1;
493 if (h->cur_pic_ptr) {
494 h->cur_pic_ptr->reference = 0;
495 for (j=i=0; h->delayed_pic[i]; i++)
496 if (h->delayed_pic[i] != h->cur_pic_ptr)
497 h->delayed_pic[j++] = h->delayed_pic[i];
498 h->delayed_pic[j] = NULL;
500 ff_h264_unref_picture(h, &h->last_pic_for_ec);
503 h->recovery_frame = -1;
504 h->frame_recovered = 0;
505 h->current_slice = 0;
509 /* forget old pics after a seek */
510 static void flush_dpb(AVCodecContext *avctx)
512 H264Context *h = avctx->priv_data;
515 memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
517 ff_h264_flush_change(h);
518 ff_h264_sei_uninit(&h->sei);
520 for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
521 ff_h264_unref_picture(h, &h->DPB[i]);
522 h->cur_pic_ptr = NULL;
523 ff_h264_unref_picture(h, &h->cur_pic);
527 ff_h264_free_tables(h);
528 h->context_initialized = 0;
531 static int get_last_needed_nal(H264Context *h)
537 for (i = 0; i < h->pkt.nb_nals; i++) {
538 H2645NAL *nal = &h->pkt.nals[i];
541 /* packets can sometimes contain multiple PPS/SPS,
542 * e.g. two PAFF field pictures in one packet, or a demuxer
543 * which splits NALs strangely if so, when frame threading we
544 * can't start the next thread until we've read all of them */
551 case H264_NAL_IDR_SLICE:
553 ret = init_get_bits8(&gb, nal->data + 1, nal->size - 1);
555 av_log(h->avctx, AV_LOG_ERROR, "Invalid zero-sized VCL NAL unit\n");
556 if (h->avctx->err_recognition & AV_EF_EXPLODE)
561 if (!get_ue_golomb_long(&gb) || // first_mb_in_slice
563 first_slice != nal->type)
566 first_slice = nal->type;
573 static void debug_green_metadata(const H264SEIGreenMetaData *gm, void *logctx)
575 av_log(logctx, AV_LOG_DEBUG, "Green Metadata Info SEI message\n");
576 av_log(logctx, AV_LOG_DEBUG, " green_metadata_type: %d\n", gm->green_metadata_type);
578 if (gm->green_metadata_type == 0) {
579 av_log(logctx, AV_LOG_DEBUG, " green_metadata_period_type: %d\n", gm->period_type);
581 if (gm->period_type == 2)
582 av_log(logctx, AV_LOG_DEBUG, " green_metadata_num_seconds: %d\n", gm->num_seconds);
583 else if (gm->period_type == 3)
584 av_log(logctx, AV_LOG_DEBUG, " green_metadata_num_pictures: %d\n", gm->num_pictures);
586 av_log(logctx, AV_LOG_DEBUG, " SEI GREEN Complexity Metrics: %f %f %f %f\n",
587 (float)gm->percent_non_zero_macroblocks/255,
588 (float)gm->percent_intra_coded_macroblocks/255,
589 (float)gm->percent_six_tap_filtering/255,
590 (float)gm->percent_alpha_point_deblocking_instance/255);
592 } else if (gm->green_metadata_type == 1) {
593 av_log(logctx, AV_LOG_DEBUG, " xsd_metric_type: %d\n", gm->xsd_metric_type);
595 if (gm->xsd_metric_type == 0)
596 av_log(logctx, AV_LOG_DEBUG, " xsd_metric_value: %f\n",
597 (float)gm->xsd_metric_value/100);
601 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
603 AVCodecContext *const avctx = h->avctx;
604 int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
611 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
612 h->current_slice = 0;
614 h->cur_pic_ptr = NULL;
615 ff_h264_sei_uninit(&h->sei);
618 if (h->nal_length_size == 4) {
619 if (buf_size > 8 && AV_RB32(buf) == 1 && AV_RB32(buf+5) > (unsigned)buf_size) {
621 }else if(buf_size > 3 && AV_RB32(buf) > 1 && AV_RB32(buf) <= (unsigned)buf_size)
625 ret = ff_h2645_packet_split(&h->pkt, buf, buf_size, avctx, h->is_avc,
626 h->nal_length_size, avctx->codec_id, avctx->flags2 & AV_CODEC_FLAG2_FAST);
628 av_log(avctx, AV_LOG_ERROR,
629 "Error splitting the input into NAL units.\n");
633 if (avctx->active_thread_type & FF_THREAD_FRAME)
634 nals_needed = get_last_needed_nal(h);
638 for (i = 0; i < h->pkt.nb_nals; i++) {
639 H2645NAL *nal = &h->pkt.nals[i];
640 int max_slice_ctx, err;
642 if (avctx->skip_frame >= AVDISCARD_NONREF &&
643 nal->ref_idc == 0 && nal->type != H264_NAL_SEI)
646 // FIXME these should stop being context-global variables
647 h->nal_ref_idc = nal->ref_idc;
648 h->nal_unit_type = nal->type;
652 case H264_NAL_IDR_SLICE:
653 if ((nal->data[1] & 0xFC) == 0x98) {
654 av_log(h->avctx, AV_LOG_ERROR, "Invalid inter IDR frame\n");
655 h->next_outputed_poc = INT_MIN;
660 if (h->current_slice && (avctx->active_thread_type & FF_THREAD_SLICE)) {
661 av_log(h, AV_LOG_ERROR, "invalid mixed IDR / non IDR frames cannot be decoded in slice multithreading mode\n");
662 ret = AVERROR_INVALIDDATA;
665 idr(h); // FIXME ensure we don't lose some frames if there is reordering
668 h->has_recovery_point = 1;
672 if ((err = ff_h264_queue_decode_slice(h, nal))) {
673 H264SliceContext *sl = h->slice_ctx + h->nb_slice_ctx_queued;
674 sl->ref_count[0] = sl->ref_count[1] = 0;
678 if (h->current_slice == 1) {
679 if (avctx->active_thread_type & FF_THREAD_FRAME &&
680 i >= nals_needed && !h->setup_finished && h->cur_pic_ptr) {
681 ff_thread_finish_setup(avctx);
682 h->setup_finished = 1;
685 if (h->avctx->hwaccel &&
686 (ret = h->avctx->hwaccel->start_frame(h->avctx, buf, buf_size)) < 0)
690 max_slice_ctx = avctx->hwaccel ? 1 : h->nb_slice_ctx;
691 if (h->nb_slice_ctx_queued == max_slice_ctx) {
692 if (h->avctx->hwaccel) {
693 ret = avctx->hwaccel->decode_slice(avctx, nal->raw_data, nal->raw_size);
694 h->nb_slice_ctx_queued = 0;
696 ret = ff_h264_execute_decode_slices(h);
697 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
704 avpriv_request_sample(avctx, "data partitioning");
707 ret = ff_h264_sei_decode(&h->sei, &nal->gb, &h->ps, avctx);
708 h->has_recovery_point = h->has_recovery_point || h->sei.recovery_point.recovery_frame_cnt != -1;
709 if (avctx->debug & FF_DEBUG_GREEN_MD)
710 debug_green_metadata(&h->sei.green_metadata, h->avctx);
711 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
715 GetBitContext tmp_gb = nal->gb;
716 if (ff_h264_decode_seq_parameter_set(&tmp_gb, avctx, &h->ps, 0) >= 0)
718 av_log(h->avctx, AV_LOG_DEBUG,
719 "SPS decoding failure, trying again with the complete NAL\n");
720 init_get_bits8(&tmp_gb, nal->raw_data + 1, nal->raw_size - 1);
721 if (ff_h264_decode_seq_parameter_set(&tmp_gb, avctx, &h->ps, 0) >= 0)
723 ff_h264_decode_seq_parameter_set(&nal->gb, avctx, &h->ps, 1);
727 ret = ff_h264_decode_picture_parameter_set(&nal->gb, avctx, &h->ps,
729 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
733 case H264_NAL_END_SEQUENCE:
734 case H264_NAL_END_STREAM:
735 case H264_NAL_FILLER_DATA:
736 case H264_NAL_SPS_EXT:
737 case H264_NAL_AUXILIARY_SLICE:
740 av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
741 nal->type, nal->size_bits);
745 av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
749 ret = ff_h264_execute_decode_slices(h);
750 if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
756 #if CONFIG_ERROR_RESILIENCE
758 * FIXME: Error handling code does not seem to support interlaced
759 * when slices span multiple rows
760 * The ff_er_add_slice calls don't work right for bottom
761 * fields; they cause massive erroneous error concealing
762 * Error marking covers both fields (top and bottom).
763 * This causes a mismatched s->error_count
764 * and a bad error table. Further, the error count goes to
765 * INT_MAX when called for bottom field, because mb_y is
766 * past end by one (callers fault) and resync_mb_y != 0
767 * causes problems for the first MB line, too.
769 if (!FIELD_PICTURE(h) && h->current_slice &&
770 h->ps.sps == (const SPS*)h->ps.sps_list[h->ps.pps->sps_id]->data &&
773 H264SliceContext *sl = h->slice_ctx;
774 int use_last_pic = h->last_pic_for_ec.f->buf[0] && !sl->ref_count[0];
776 ff_h264_set_erpic(&sl->er.cur_pic, h->cur_pic_ptr);
779 ff_h264_set_erpic(&sl->er.last_pic, &h->last_pic_for_ec);
780 sl->ref_list[0][0].parent = &h->last_pic_for_ec;
781 memcpy(sl->ref_list[0][0].data, h->last_pic_for_ec.f->data, sizeof(sl->ref_list[0][0].data));
782 memcpy(sl->ref_list[0][0].linesize, h->last_pic_for_ec.f->linesize, sizeof(sl->ref_list[0][0].linesize));
783 sl->ref_list[0][0].reference = h->last_pic_for_ec.reference;
784 } else if (sl->ref_count[0]) {
785 ff_h264_set_erpic(&sl->er.last_pic, sl->ref_list[0][0].parent);
787 ff_h264_set_erpic(&sl->er.last_pic, NULL);
789 if (sl->ref_count[1])
790 ff_h264_set_erpic(&sl->er.next_pic, sl->ref_list[1][0].parent);
792 sl->er.ref_count = sl->ref_count[0];
794 ff_er_frame_end(&sl->er);
796 memset(&sl->ref_list[0][0], 0, sizeof(sl->ref_list[0][0]));
798 #endif /* CONFIG_ERROR_RESILIENCE */
800 if (h->cur_pic_ptr && !h->droppable && h->has_slice) {
801 ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
802 h->picture_structure == PICT_BOTTOM_FIELD);
805 return (ret < 0) ? ret : buf_size;
809 * Return the number of bytes consumed for building the current frame.
811 static int get_consumed_bytes(int pos, int buf_size)
814 pos = 1; // avoid infinite loops (I doubt that is needed but...)
815 if (pos + 10 > buf_size)
816 pos = buf_size; // oops ;)
821 static int output_frame(H264Context *h, AVFrame *dst, H264Picture *srcp)
823 AVFrame *src = srcp->f;
826 if (src->format == AV_PIX_FMT_VIDEOTOOLBOX && src->buf[0]->size == 1)
827 return AVERROR_EXTERNAL;
829 ret = av_frame_ref(dst, src);
833 av_dict_set(&dst->metadata, "stereo_mode", ff_h264_sei_stereo_mode(&h->sei.frame_packing), 0);
835 if (srcp->sei_recovery_frame_cnt == 0)
841 static int is_extra(const uint8_t *buf, int buf_size)
843 int cnt= buf[5]&0x1f;
844 const uint8_t *p= buf+6;
846 int nalsize= AV_RB16(p) + 2;
847 if(nalsize > buf_size - (p-buf) || (p[2] & 0x9F) != 7)
855 int nalsize= AV_RB16(p) + 2;
856 if(nalsize > buf_size - (p-buf) || (p[2] & 0x9F) != 8)
863 static int finalize_frame(H264Context *h, AVFrame *dst, H264Picture *out, int *got_frame)
867 if (((h->avctx->flags & AV_CODEC_FLAG_OUTPUT_CORRUPT) ||
868 (h->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL) ||
871 if (!h->avctx->hwaccel &&
872 (out->field_poc[0] == INT_MAX ||
873 out->field_poc[1] == INT_MAX)
877 int field = out->field_poc[0] == INT_MAX;
878 uint8_t *dst_data[4];
880 const uint8_t *src_data[4];
882 av_log(h->avctx, AV_LOG_DEBUG, "Duplicating field %d to fill missing\n", field);
884 for (p = 0; p<4; p++) {
885 dst_data[p] = f->data[p] + (field^1)*f->linesize[p];
886 src_data[p] = f->data[p] + field *f->linesize[p];
887 linesizes[p] = 2*f->linesize[p];
890 av_image_copy(dst_data, linesizes, src_data, linesizes,
891 f->format, f->width, f->height>>1);
894 ret = output_frame(h, dst, out);
900 if (CONFIG_MPEGVIDEO) {
901 ff_print_debug_info2(h->avctx, dst, NULL,
906 h->mb_width, h->mb_height, h->mb_stride, 1);
913 static int send_next_delayed_frame(H264Context *h, AVFrame *dst_frame,
914 int *got_frame, int buf_index)
917 H264Picture *out = h->delayed_pic[0];
919 h->cur_pic_ptr = NULL;
925 !h->delayed_pic[i]->f->key_frame &&
926 !h->delayed_pic[i]->mmco_reset;
928 if (h->delayed_pic[i]->poc < out->poc) {
929 out = h->delayed_pic[i];
933 for (i = out_idx; h->delayed_pic[i]; i++)
934 h->delayed_pic[i] = h->delayed_pic[i + 1];
937 out->reference &= ~DELAYED_PIC_REF;
938 ret = finalize_frame(h, dst_frame, out, got_frame);
946 static int h264_decode_frame(AVCodecContext *avctx, void *data,
947 int *got_frame, AVPacket *avpkt)
949 const uint8_t *buf = avpkt->data;
950 int buf_size = avpkt->size;
951 H264Context *h = avctx->priv_data;
952 AVFrame *pict = data;
956 h->flags = avctx->flags;
957 h->setup_finished = 0;
958 h->nb_slice_ctx_queued = 0;
960 ff_h264_unref_picture(h, &h->last_pic_for_ec);
962 /* end of stream, output what is still in the buffers */
964 return send_next_delayed_frame(h, pict, got_frame, 0);
966 if (h->is_avc && av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, NULL)) {
968 uint8_t *side = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
969 if (is_extra(side, side_size))
970 ff_h264_decode_extradata(side, side_size,
971 &h->ps, &h->is_avc, &h->nal_length_size,
972 avctx->err_recognition, avctx);
974 if(h->is_avc && buf_size >= 9 && buf[0]==1 && buf[2]==0 && (buf[4]&0xFC)==0xFC && (buf[5]&0x1F) && buf[8]==0x67){
975 if (is_extra(buf, buf_size))
976 return ff_h264_decode_extradata(buf, buf_size,
977 &h->ps, &h->is_avc, &h->nal_length_size,
978 avctx->err_recognition, avctx);
981 buf_index = decode_nal_units(h, buf, buf_size);
983 return AVERROR_INVALIDDATA;
985 if (!h->cur_pic_ptr && h->nal_unit_type == H264_NAL_END_SEQUENCE) {
986 av_assert0(buf_index <= buf_size);
987 return send_next_delayed_frame(h, pict, got_frame, buf_index);
990 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) && (!h->cur_pic_ptr || !h->has_slice)) {
991 if (avctx->skip_frame >= AVDISCARD_NONREF ||
992 buf_size >= 4 && !memcmp("Q264", buf, 4))
994 av_log(avctx, AV_LOG_ERROR, "no frame!\n");
995 return AVERROR_INVALIDDATA;
998 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) ||
999 (h->mb_y >= h->mb_height && h->mb_height)) {
1000 if ((ret = ff_h264_field_end(h, &h->slice_ctx[0], 0)) < 0)
1003 /* Wait for second field. */
1004 if (h->next_output_pic) {
1005 ret = finalize_frame(h, pict, h->next_output_pic, got_frame);
1011 av_assert0(pict->buf[0] || !*got_frame);
1013 ff_h264_unref_picture(h, &h->last_pic_for_ec);
1015 return get_consumed_bytes(buf_index, buf_size);
1018 #define OFFSET(x) offsetof(H264Context, x)
1019 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1020 static const AVOption h264_options[] = {
1021 { "is_avc", "is avc", OFFSET(is_avc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0 },
1022 { "nal_length_size", "nal_length_size", OFFSET(nal_length_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0 },
1023 { "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD },
1027 static const AVClass h264_class = {
1028 .class_name = "H264 Decoder",
1029 .item_name = av_default_item_name,
1030 .option = h264_options,
1031 .version = LIBAVUTIL_VERSION_INT,
1034 AVCodec ff_h264_decoder = {
1036 .long_name = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
1037 .type = AVMEDIA_TYPE_VIDEO,
1038 .id = AV_CODEC_ID_H264,
1039 .priv_data_size = sizeof(H264Context),
1040 .init = h264_decode_init,
1041 .close = h264_decode_end,
1042 .decode = h264_decode_frame,
1043 .capabilities = /*AV_CODEC_CAP_DRAW_HORIZ_BAND |*/ AV_CODEC_CAP_DR1 |
1044 AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS |
1045 AV_CODEC_CAP_FRAME_THREADS,
1046 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING,
1048 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1049 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
1050 .profiles = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
1051 .priv_class = &h264_class,