lavc: Add per-thread surfaces in get_hw_frame_parameters()
[ffmpeg.git] / libavcodec / h264_parser.c
1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... parser
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 parser.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27
28 #include <assert.h>
29 #include <stdint.h>
30
31 #include "libavutil/avutil.h"
32 #include "libavutil/error.h"
33 #include "libavutil/log.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/pixfmt.h"
36
37 #include "avcodec.h"
38 #include "get_bits.h"
39 #include "golomb_legacy.h"
40 #include "h264.h"
41 #include "h264_sei.h"
42 #include "h264_ps.h"
43 #include "h264data.h"
44 #include "internal.h"
45 #include "mpegutils.h"
46 #include "parser.h"
47
48 typedef struct H264ParseContext {
49     ParseContext pc;
50     H264ParamSets ps;
51     H264DSPContext h264dsp;
52     H264POCContext poc;
53     H264SEIContext sei;
54     int is_avc;
55     int nal_length_size;
56     int got_first;
57     int picture_structure;
58 } H264ParseContext;
59
60
61 static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
62                                int buf_size)
63 {
64     int i;
65     uint32_t state;
66     ParseContext *pc = &p->pc;
67 //    mb_addr= pc->mb_addr - 1;
68     state = pc->state;
69     if (state > 13)
70         state = 7;
71
72     for (i = 0; i < buf_size; i++) {
73         if (state == 7) {
74             i += p->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
75             if (i < buf_size)
76                 state = 2;
77         } else if (state <= 2) {
78             if (buf[i] == 1)
79                 state ^= 5;            // 2->7, 1->4, 0->5
80             else if (buf[i])
81                 state = 7;
82             else
83                 state >>= 1;           // 2->1, 1->0, 0->0
84         } else if (state <= 5) {
85             int nalu_type = buf[i] & 0x1F;
86             if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
87                 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
88                 if (pc->frame_start_found) {
89                     i++;
90                     goto found;
91                 }
92             } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
93                        nalu_type == H264_NAL_IDR_SLICE) {
94                 if (pc->frame_start_found) {
95                     state += 8;
96                     continue;
97                 } else
98                     pc->frame_start_found = 1;
99             }
100             state = 7;
101         } else {
102             // first_mb_in_slice is 0, probably the first nal of a new slice
103             if (buf[i] & 0x80)
104                 goto found;
105             state = 7;
106         }
107     }
108     pc->state = state;
109     return END_NOT_FOUND;
110
111 found:
112     pc->state             = 7;
113     pc->frame_start_found = 0;
114     return i - (state & 5);
115 }
116
117 static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
118                            AVCodecContext *avctx)
119 {
120     H264PredWeightTable pwt;
121     int slice_type_nos = s->pict_type & 3;
122     H264ParseContext *p = s->priv_data;
123     int list_count, ref_count[2];
124
125
126     if (p->ps.pps->redundant_pic_cnt_present)
127         get_ue_golomb(gb); // redundant_pic_count
128
129     if (slice_type_nos == AV_PICTURE_TYPE_B)
130         get_bits1(gb); // direct_spatial_mv_pred
131
132     if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
133                                 slice_type_nos, p->picture_structure) < 0)
134         return AVERROR_INVALIDDATA;
135
136     if (slice_type_nos != AV_PICTURE_TYPE_I) {
137         int list;
138         for (list = 0; list < list_count; list++) {
139             if (get_bits1(gb)) {
140                 int index;
141                 for (index = 0; ; index++) {
142                     unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
143
144                     if (reordering_of_pic_nums_idc < 3)
145                         get_ue_golomb(gb);
146                     else if (reordering_of_pic_nums_idc > 3) {
147                         av_log(avctx, AV_LOG_ERROR,
148                                "illegal reordering_of_pic_nums_idc %d\n",
149                                reordering_of_pic_nums_idc);
150                         return AVERROR_INVALIDDATA;
151                     } else
152                         break;
153
154                     if (index >= ref_count[list]) {
155                         av_log(avctx, AV_LOG_ERROR,
156                                "reference count %d overflow\n", index);
157                         return AVERROR_INVALIDDATA;
158                     }
159                 }
160             }
161         }
162     }
163
164     if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
165         (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
166         ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
167                                   &pwt);
168
169     if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
170         int i;
171         for (i = 0; i < MAX_MMCO_COUNT; i++) {
172             MMCOOpcode opcode = get_ue_golomb_31(gb);
173             if (opcode > (unsigned) MMCO_LONG) {
174                 av_log(avctx, AV_LOG_ERROR,
175                        "illegal memory management control operation %d\n",
176                        opcode);
177                 return AVERROR_INVALIDDATA;
178             }
179             if (opcode == MMCO_END)
180                return 0;
181             else if (opcode == MMCO_RESET)
182                 return 1;
183
184             if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
185                 get_ue_golomb(gb);
186             if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
187                 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
188                 get_ue_golomb_31(gb);
189         }
190     }
191
192     return 0;
193 }
194
195 /**
196  * Parse NAL units of found picture and decode some basic information.
197  *
198  * @param s parser context.
199  * @param avctx codec context.
200  * @param buf buffer with field/frame data.
201  * @param buf_size size of the buffer.
202  */
203 static inline int parse_nal_units(AVCodecParserContext *s,
204                                   AVCodecContext *avctx,
205                                   const uint8_t *buf, int buf_size)
206 {
207     H264ParseContext *p = s->priv_data;
208     const uint8_t *buf_end = buf + buf_size;
209
210     H2645NAL nal = { NULL };
211
212     unsigned int pps_id;
213     unsigned int slice_type;
214     int state = -1, got_reset = 0;
215     int field_poc[2];
216     int ret;
217
218     /* set some sane default values */
219     s->pict_type         = AV_PICTURE_TYPE_I;
220     s->key_frame         = 0;
221     s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
222
223     ff_h264_sei_uninit(&p->sei);
224
225     if (!buf_size)
226         return 0;
227
228     for (;;) {
229         const SPS *sps;
230         int src_length, consumed;
231         buf = avpriv_find_start_code(buf, buf_end, &state);
232         if (buf >= buf_end)
233             break;
234         --buf;
235         src_length = buf_end - buf;
236         switch (state & 0x1f) {
237         case H264_NAL_SLICE:
238         case H264_NAL_IDR_SLICE:
239             // Do not walk the whole buffer just to decode slice header
240             if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
241                 /* IDR or disposable slice
242                  * No need to decode many bytes because MMCOs shall not be present. */
243                 if (src_length > 60)
244                     src_length = 60;
245             } else {
246                 /* To decode up to MMCOs */
247                 if (src_length > 1000)
248                     src_length = 1000;
249             }
250             break;
251         }
252
253         consumed = ff_h2645_extract_rbsp(buf, src_length, &nal);
254         if (consumed < 0)
255             break;
256
257         ret = init_get_bits(&nal.gb, nal.data, nal.size * 8);
258         if (ret < 0)
259             goto fail;
260         get_bits1(&nal.gb);
261         nal.ref_idc = get_bits(&nal.gb, 2);
262         nal.type    = get_bits(&nal.gb, 5);
263
264         switch (nal.type) {
265         case H264_NAL_SPS:
266             ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps);
267             break;
268         case H264_NAL_PPS:
269             ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
270                                                  nal.size_bits);
271             break;
272         case H264_NAL_SEI:
273             ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
274             break;
275         case H264_NAL_IDR_SLICE:
276             s->key_frame = 1;
277
278             p->poc.prev_frame_num        = 0;
279             p->poc.prev_frame_num_offset = 0;
280             p->poc.prev_poc_msb          =
281             p->poc.prev_poc_lsb          = 0;
282         /* fall through */
283         case H264_NAL_SLICE:
284             get_ue_golomb(&nal.gb);  // skip first_mb_in_slice
285             slice_type   = get_ue_golomb_31(&nal.gb);
286             s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
287             if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
288                 /* key frame, since recovery_frame_cnt is set */
289                 s->key_frame = 1;
290             }
291             pps_id = get_ue_golomb(&nal.gb);
292             if (pps_id >= MAX_PPS_COUNT) {
293                 av_log(avctx, AV_LOG_ERROR,
294                        "pps_id %u out of range\n", pps_id);
295                 goto fail;
296             }
297             if (!p->ps.pps_list[pps_id]) {
298                 av_log(avctx, AV_LOG_ERROR,
299                        "non-existing PPS %u referenced\n", pps_id);
300                 goto fail;
301             }
302             p->ps.pps = (const PPS*)p->ps.pps_list[pps_id]->data;
303             if (!p->ps.sps_list[p->ps.pps->sps_id]) {
304                 av_log(avctx, AV_LOG_ERROR,
305                        "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
306                 goto fail;
307             }
308             p->ps.sps = (SPS*)p->ps.sps_list[p->ps.pps->sps_id]->data;
309
310             sps = p->ps.sps;
311
312             p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
313
314             s->coded_width  = 16 * sps->mb_width;
315             s->coded_height = 16 * sps->mb_height;
316             s->width        = s->coded_width  - (sps->crop_right + sps->crop_left);
317             s->height       = s->coded_height - (sps->crop_top   + sps->crop_bottom);
318             if (s->width <= 0 || s->height <= 0) {
319                 s->width  = s->coded_width;
320                 s->height = s->coded_height;
321             }
322
323             switch (sps->bit_depth_luma) {
324             case 9:
325                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P9;
326                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
327                 else                                  s->format = AV_PIX_FMT_YUV420P9;
328                 break;
329             case 10:
330                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P10;
331                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
332                 else                                  s->format = AV_PIX_FMT_YUV420P10;
333                 break;
334             case 8:
335                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P;
336                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
337                 else                                  s->format = AV_PIX_FMT_YUV420P;
338                 break;
339             default:
340                 s->format = AV_PIX_FMT_NONE;
341             }
342
343             avctx->profile = ff_h264_get_profile(sps);
344             avctx->level   = sps->level_idc;
345
346             if (sps->frame_mbs_only_flag) {
347                 p->picture_structure = PICT_FRAME;
348             } else {
349                 if (get_bits1(&nal.gb)) { // field_pic_flag
350                     p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
351                 } else {
352                     p->picture_structure = PICT_FRAME;
353                 }
354             }
355
356             if (nal.type == H264_NAL_IDR_SLICE)
357                 get_ue_golomb(&nal.gb); /* idr_pic_id */
358             if (sps->poc_type == 0) {
359                 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
360
361                 if (p->ps.pps->pic_order_present == 1 &&
362                     p->picture_structure == PICT_FRAME)
363                     p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
364             }
365
366             if (sps->poc_type == 1 &&
367                 !sps->delta_pic_order_always_zero_flag) {
368                 p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
369
370                 if (p->ps.pps->pic_order_present == 1 &&
371                     p->picture_structure == PICT_FRAME)
372                     p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
373             }
374
375             /* Decode POC of this picture.
376              * The prev_ values needed for decoding POC of the next picture are not set here. */
377             field_poc[0] = field_poc[1] = INT_MAX;
378             ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
379                              &p->poc, p->picture_structure, nal.ref_idc);
380
381             /* Continue parsing to check if MMCO_RESET is present.
382              * FIXME: MMCO_RESET could appear in non-first slice.
383              *        Maybe, we should parse all undisposable non-IDR slice of this
384              *        picture until encountering MMCO_RESET in a slice of it. */
385             if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
386                 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
387                 if (got_reset < 0)
388                     goto fail;
389             }
390
391             /* Set up the prev_ values for decoding POC of the next picture. */
392             p->poc.prev_frame_num        = got_reset ? 0 : p->poc.frame_num;
393             p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
394             if (nal.ref_idc != 0) {
395                 if (!got_reset) {
396                     p->poc.prev_poc_msb = p->poc.poc_msb;
397                     p->poc.prev_poc_lsb = p->poc.poc_lsb;
398                 } else {
399                     p->poc.prev_poc_msb = 0;
400                     p->poc.prev_poc_lsb =
401                         p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
402                 }
403             }
404
405             if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
406                 switch (p->sei.picture_timing.pic_struct) {
407                 case H264_SEI_PIC_STRUCT_TOP_FIELD:
408                 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
409                     s->repeat_pict = 0;
410                     break;
411                 case H264_SEI_PIC_STRUCT_FRAME:
412                 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
413                 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
414                     s->repeat_pict = 1;
415                     break;
416                 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
417                 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
418                     s->repeat_pict = 2;
419                     break;
420                 case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
421                     s->repeat_pict = 3;
422                     break;
423                 case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
424                     s->repeat_pict = 5;
425                     break;
426                 default:
427                     s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
428                     break;
429                 }
430             } else {
431                 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
432             }
433
434             if (p->picture_structure == PICT_FRAME) {
435                 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
436                 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
437                     switch (p->sei.picture_timing.pic_struct) {
438                     case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
439                     case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
440                         s->field_order = AV_FIELD_TT;
441                         break;
442                     case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
443                     case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
444                         s->field_order = AV_FIELD_BB;
445                         break;
446                     default:
447                         s->field_order = AV_FIELD_PROGRESSIVE;
448                         break;
449                     }
450                 } else {
451                     if (field_poc[0] < field_poc[1])
452                         s->field_order = AV_FIELD_TT;
453                     else if (field_poc[0] > field_poc[1])
454                         s->field_order = AV_FIELD_BB;
455                     else
456                         s->field_order = AV_FIELD_PROGRESSIVE;
457                 }
458             } else {
459                 if (p->picture_structure == PICT_TOP_FIELD)
460                     s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
461                 else
462                     s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
463                 s->field_order = AV_FIELD_UNKNOWN;
464             }
465
466             av_freep(&nal.rbsp_buffer);
467             return 0; /* no need to evaluate the rest */
468         }
469         buf += consumed;
470     }
471     /* didn't find a picture! */
472     av_log(avctx, AV_LOG_ERROR, "missing picture in access unit\n");
473 fail:
474     av_freep(&nal.rbsp_buffer);
475     return -1;
476 }
477
478 static int h264_parse(AVCodecParserContext *s,
479                       AVCodecContext *avctx,
480                       const uint8_t **poutbuf, int *poutbuf_size,
481                       const uint8_t *buf, int buf_size)
482 {
483     H264ParseContext *p = s->priv_data;
484     ParseContext *pc = &p->pc;
485     int next;
486
487     if (!p->got_first) {
488         p->got_first = 1;
489         if (avctx->extradata_size) {
490             ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
491                                      &p->ps, &p->is_avc, &p->nal_length_size,
492                                      avctx->err_recognition, avctx);
493         }
494     }
495
496     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
497         next = buf_size;
498     } else {
499         next = h264_find_frame_end(p, buf, buf_size);
500
501         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
502             *poutbuf      = NULL;
503             *poutbuf_size = 0;
504             return buf_size;
505         }
506
507         if (next < 0 && next != END_NOT_FOUND) {
508             assert(pc->last_index + next >= 0);
509             h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
510         }
511     }
512
513     parse_nal_units(s, avctx, buf, buf_size);
514
515     if (p->sei.picture_timing.cpb_removal_delay >= 0) {
516         s->dts_sync_point    = p->sei.buffering_period.present;
517         s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
518         s->pts_dts_delta     = p->sei.picture_timing.dpb_output_delay;
519     } else {
520         s->dts_sync_point    = INT_MIN;
521         s->dts_ref_dts_delta = INT_MIN;
522         s->pts_dts_delta     = INT_MIN;
523     }
524
525     if (s->flags & PARSER_FLAG_ONCE) {
526         s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
527     }
528
529     *poutbuf      = buf;
530     *poutbuf_size = buf_size;
531     return next;
532 }
533
534 static int h264_split(AVCodecContext *avctx,
535                       const uint8_t *buf, int buf_size)
536 {
537     int i;
538     uint32_t state = -1;
539     int has_sps    = 0;
540
541     for (i = 0; i <= buf_size; i++) {
542         if ((state & 0xFFFFFF1F) == 0x107)
543             has_sps = 1;
544         /*  if((state&0xFFFFFF1F) == 0x101 ||
545          *     (state&0xFFFFFF1F) == 0x102 ||
546          *     (state&0xFFFFFF1F) == 0x105) {
547          *  }
548          */
549         if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
550             (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
551             (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
552             (state & 0xFFFFFF1F) != 0x10f) {
553             if (has_sps) {
554                 while (i > 4 && buf[i - 5] == 0)
555                     i--;
556                 return i - 4;
557             }
558         }
559         if (i < buf_size)
560             state = (state << 8) | buf[i];
561     }
562     return 0;
563 }
564
565 static void h264_close(AVCodecParserContext *s)
566 {
567     H264ParseContext *p = s->priv_data;
568     ParseContext *pc = &p->pc;
569     int i;
570
571     av_free(pc->buffer);
572
573     ff_h264_sei_uninit(&p->sei);
574
575     for (i = 0; i < FF_ARRAY_ELEMS(p->ps.sps_list); i++)
576         av_buffer_unref(&p->ps.sps_list[i]);
577
578     for (i = 0; i < FF_ARRAY_ELEMS(p->ps.pps_list); i++)
579         av_buffer_unref(&p->ps.pps_list[i]);
580 }
581
582 static av_cold int init(AVCodecParserContext *s)
583 {
584     H264ParseContext *p = s->priv_data;
585
586     ff_h264dsp_init(&p->h264dsp, 8, 1);
587     return 0;
588 }
589
590 AVCodecParser ff_h264_parser = {
591     .codec_ids      = { AV_CODEC_ID_H264 },
592     .priv_data_size = sizeof(H264ParseContext),
593     .parser_init    = init,
594     .parser_parse   = h264_parse,
595     .parser_close   = h264_close,
596     .split          = h264_split,
597 };