| 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 FFmpeg. |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * H.264 / AVC / MPEG4 part10 parser. |
| 25 | * @author Michael Niedermayer <michaelni@gmx.at> |
| 26 | */ |
| 27 | |
| 28 | #define UNCHECKED_BITSTREAM_READER 1 |
| 29 | |
| 30 | #include "libavutil/attributes.h" |
| 31 | #include "parser.h" |
| 32 | #include "h264data.h" |
| 33 | #include "golomb.h" |
| 34 | #include "internal.h" |
| 35 | #include "mpegutils.h" |
| 36 | |
| 37 | |
| 38 | static int h264_find_frame_end(H264Context *h, const uint8_t *buf, |
| 39 | int buf_size) |
| 40 | { |
| 41 | int i, j; |
| 42 | uint32_t state; |
| 43 | ParseContext *pc = &h->parse_context; |
| 44 | int next_avc= h->is_avc ? 0 : buf_size; |
| 45 | |
| 46 | // mb_addr= pc->mb_addr - 1; |
| 47 | state = pc->state; |
| 48 | if (state > 13) |
| 49 | state = 7; |
| 50 | |
| 51 | if (h->is_avc && !h->nal_length_size) |
| 52 | av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n"); |
| 53 | |
| 54 | for (i = 0; i < buf_size; i++) { |
| 55 | if (i >= next_avc) { |
| 56 | int nalsize = 0; |
| 57 | i = next_avc; |
| 58 | for (j = 0; j < h->nal_length_size; j++) |
| 59 | nalsize = (nalsize << 8) | buf[i++]; |
| 60 | if (nalsize <= 0 || nalsize > buf_size - i) { |
| 61 | av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i); |
| 62 | return buf_size; |
| 63 | } |
| 64 | next_avc = i + nalsize; |
| 65 | state = 5; |
| 66 | } |
| 67 | |
| 68 | if (state == 7) { |
| 69 | i += h->h264dsp.startcode_find_candidate(buf + i, next_avc - i); |
| 70 | if (i < next_avc) |
| 71 | state = 2; |
| 72 | } else if (state <= 2) { |
| 73 | if (buf[i] == 1) |
| 74 | state ^= 5; // 2->7, 1->4, 0->5 |
| 75 | else if (buf[i]) |
| 76 | state = 7; |
| 77 | else |
| 78 | state >>= 1; // 2->1, 1->0, 0->0 |
| 79 | } else if (state <= 5) { |
| 80 | int nalu_type = buf[i] & 0x1F; |
| 81 | if (nalu_type == NAL_SEI || nalu_type == NAL_SPS || |
| 82 | nalu_type == NAL_PPS || nalu_type == NAL_AUD) { |
| 83 | if (pc->frame_start_found) { |
| 84 | i++; |
| 85 | goto found; |
| 86 | } |
| 87 | } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA || |
| 88 | nalu_type == NAL_IDR_SLICE) { |
| 89 | state += 8; |
| 90 | continue; |
| 91 | } |
| 92 | state = 7; |
| 93 | } else { |
| 94 | h->parse_history[h->parse_history_count++]= buf[i]; |
| 95 | if (h->parse_history_count>5) { |
| 96 | unsigned int mb, last_mb= h->parse_last_mb; |
| 97 | GetBitContext gb; |
| 98 | |
| 99 | init_get_bits(&gb, h->parse_history, 8*h->parse_history_count); |
| 100 | h->parse_history_count=0; |
| 101 | mb= get_ue_golomb_long(&gb); |
| 102 | h->parse_last_mb= mb; |
| 103 | if (pc->frame_start_found) { |
| 104 | if (mb <= last_mb) |
| 105 | goto found; |
| 106 | } else |
| 107 | pc->frame_start_found = 1; |
| 108 | state = 7; |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | pc->state = state; |
| 113 | if (h->is_avc) |
| 114 | return next_avc; |
| 115 | return END_NOT_FOUND; |
| 116 | |
| 117 | found: |
| 118 | pc->state = 7; |
| 119 | pc->frame_start_found = 0; |
| 120 | if (h->is_avc) |
| 121 | return next_avc; |
| 122 | return i - (state & 5) - 5 * (state > 7); |
| 123 | } |
| 124 | |
| 125 | static int scan_mmco_reset(AVCodecParserContext *s) |
| 126 | { |
| 127 | H264Context *h = s->priv_data; |
| 128 | |
| 129 | h->slice_type_nos = s->pict_type & 3; |
| 130 | |
| 131 | if (h->pps.redundant_pic_cnt_present) |
| 132 | get_ue_golomb(&h->gb); // redundant_pic_count |
| 133 | |
| 134 | if (ff_set_ref_count(h) < 0) |
| 135 | return AVERROR_INVALIDDATA; |
| 136 | |
| 137 | if (h->slice_type_nos != AV_PICTURE_TYPE_I) { |
| 138 | int list; |
| 139 | for (list = 0; list < h->list_count; list++) { |
| 140 | if (get_bits1(&h->gb)) { |
| 141 | int index; |
| 142 | for (index = 0; ; index++) { |
| 143 | unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb); |
| 144 | |
| 145 | if (reordering_of_pic_nums_idc < 3) |
| 146 | get_ue_golomb(&h->gb); |
| 147 | else if (reordering_of_pic_nums_idc > 3) { |
| 148 | av_log(h->avctx, AV_LOG_ERROR, |
| 149 | "illegal reordering_of_pic_nums_idc %d\n", |
| 150 | reordering_of_pic_nums_idc); |
| 151 | return AVERROR_INVALIDDATA; |
| 152 | } else |
| 153 | break; |
| 154 | |
| 155 | if (index >= h->ref_count[list]) { |
| 156 | av_log(h->avctx, AV_LOG_ERROR, |
| 157 | "reference count %d overflow\n", index); |
| 158 | return AVERROR_INVALIDDATA; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | if ((h->pps.weighted_pred && h->slice_type_nos == AV_PICTURE_TYPE_P) || |
| 166 | (h->pps.weighted_bipred_idc == 1 && h->slice_type_nos == AV_PICTURE_TYPE_B)) |
| 167 | ff_pred_weight_table(h); |
| 168 | |
| 169 | if (get_bits1(&h->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(&h->gb); |
| 173 | if (opcode > (unsigned) MMCO_LONG) { |
| 174 | av_log(h->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(&h->gb); |
| 186 | if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED || |
| 187 | opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) |
| 188 | get_ue_golomb_31(&h->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 * const buf, int buf_size) |
| 206 | { |
| 207 | H264Context *h = s->priv_data; |
| 208 | int buf_index, next_avc; |
| 209 | unsigned int pps_id; |
| 210 | unsigned int slice_type; |
| 211 | int state = -1, got_reset = 0; |
| 212 | const uint8_t *ptr; |
| 213 | int q264 = buf_size >=4 && !memcmp("Q264", buf, 4); |
| 214 | int field_poc[2]; |
| 215 | |
| 216 | /* set some sane default values */ |
| 217 | s->pict_type = AV_PICTURE_TYPE_I; |
| 218 | s->key_frame = 0; |
| 219 | s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN; |
| 220 | |
| 221 | h->avctx = avctx; |
| 222 | ff_h264_reset_sei(h); |
| 223 | h->sei_fpa.frame_packing_arrangement_cancel_flag = -1; |
| 224 | |
| 225 | if (!buf_size) |
| 226 | return 0; |
| 227 | |
| 228 | buf_index = 0; |
| 229 | next_avc = h->is_avc ? 0 : buf_size; |
| 230 | for (;;) { |
| 231 | int src_length, dst_length, consumed, nalsize = 0; |
| 232 | |
| 233 | if (buf_index >= next_avc) { |
| 234 | nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index); |
| 235 | if (nalsize < 0) |
| 236 | break; |
| 237 | next_avc = buf_index + nalsize; |
| 238 | } else { |
| 239 | buf_index = find_start_code(buf, buf_size, buf_index, next_avc); |
| 240 | if (buf_index >= buf_size) |
| 241 | break; |
| 242 | if (buf_index >= next_avc) |
| 243 | continue; |
| 244 | } |
| 245 | src_length = next_avc - buf_index; |
| 246 | |
| 247 | state = buf[buf_index]; |
| 248 | switch (state & 0x1f) { |
| 249 | case NAL_SLICE: |
| 250 | case NAL_IDR_SLICE: |
| 251 | // Do not walk the whole buffer just to decode slice header |
| 252 | if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) { |
| 253 | /* IDR or disposable slice |
| 254 | * No need to decode many bytes because MMCOs shall not be present. */ |
| 255 | if (src_length > 60) |
| 256 | src_length = 60; |
| 257 | } else { |
| 258 | /* To decode up to MMCOs */ |
| 259 | if (src_length > 1000) |
| 260 | src_length = 1000; |
| 261 | } |
| 262 | break; |
| 263 | } |
| 264 | ptr = ff_h264_decode_nal(h, buf + buf_index, &dst_length, |
| 265 | &consumed, src_length); |
| 266 | if (!ptr || dst_length < 0) |
| 267 | break; |
| 268 | |
| 269 | buf_index += consumed; |
| 270 | |
| 271 | init_get_bits(&h->gb, ptr, 8 * dst_length); |
| 272 | switch (h->nal_unit_type) { |
| 273 | case NAL_SPS: |
| 274 | ff_h264_decode_seq_parameter_set(h); |
| 275 | break; |
| 276 | case NAL_PPS: |
| 277 | ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits); |
| 278 | break; |
| 279 | case NAL_SEI: |
| 280 | ff_h264_decode_sei(h); |
| 281 | break; |
| 282 | case NAL_IDR_SLICE: |
| 283 | s->key_frame = 1; |
| 284 | |
| 285 | h->prev_frame_num = 0; |
| 286 | h->prev_frame_num_offset = 0; |
| 287 | h->prev_poc_msb = |
| 288 | h->prev_poc_lsb = 0; |
| 289 | /* fall through */ |
| 290 | case NAL_SLICE: |
| 291 | get_ue_golomb_long(&h->gb); // skip first_mb_in_slice |
| 292 | slice_type = get_ue_golomb_31(&h->gb); |
| 293 | s->pict_type = golomb_to_pict_type[slice_type % 5]; |
| 294 | if (h->sei_recovery_frame_cnt >= 0) { |
| 295 | /* key frame, since recovery_frame_cnt is set */ |
| 296 | s->key_frame = 1; |
| 297 | } |
| 298 | pps_id = get_ue_golomb(&h->gb); |
| 299 | if (pps_id >= MAX_PPS_COUNT) { |
| 300 | av_log(h->avctx, AV_LOG_ERROR, |
| 301 | "pps_id %u out of range\n", pps_id); |
| 302 | return -1; |
| 303 | } |
| 304 | if (!h->pps_buffers[pps_id]) { |
| 305 | av_log(h->avctx, AV_LOG_ERROR, |
| 306 | "non-existing PPS %u referenced\n", pps_id); |
| 307 | return -1; |
| 308 | } |
| 309 | h->pps = *h->pps_buffers[pps_id]; |
| 310 | if (!h->sps_buffers[h->pps.sps_id]) { |
| 311 | av_log(h->avctx, AV_LOG_ERROR, |
| 312 | "non-existing SPS %u referenced\n", h->pps.sps_id); |
| 313 | return -1; |
| 314 | } |
| 315 | h->sps = *h->sps_buffers[h->pps.sps_id]; |
| 316 | h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num); |
| 317 | |
| 318 | if(h->sps.ref_frame_count <= 1 && h->pps.ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I) |
| 319 | s->key_frame = 1; |
| 320 | |
| 321 | avctx->profile = ff_h264_get_profile(&h->sps); |
| 322 | avctx->level = h->sps.level_idc; |
| 323 | |
| 324 | if (h->sps.frame_mbs_only_flag) { |
| 325 | h->picture_structure = PICT_FRAME; |
| 326 | } else { |
| 327 | if (get_bits1(&h->gb)) { // field_pic_flag |
| 328 | h->picture_structure = PICT_TOP_FIELD + get_bits1(&h->gb); // bottom_field_flag |
| 329 | } else { |
| 330 | h->picture_structure = PICT_FRAME; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | if (h->nal_unit_type == NAL_IDR_SLICE) |
| 335 | get_ue_golomb(&h->gb); /* idr_pic_id */ |
| 336 | if (h->sps.poc_type == 0) { |
| 337 | h->poc_lsb = get_bits(&h->gb, h->sps.log2_max_poc_lsb); |
| 338 | |
| 339 | if (h->pps.pic_order_present == 1 && |
| 340 | h->picture_structure == PICT_FRAME) |
| 341 | h->delta_poc_bottom = get_se_golomb(&h->gb); |
| 342 | } |
| 343 | |
| 344 | if (h->sps.poc_type == 1 && |
| 345 | !h->sps.delta_pic_order_always_zero_flag) { |
| 346 | h->delta_poc[0] = get_se_golomb(&h->gb); |
| 347 | |
| 348 | if (h->pps.pic_order_present == 1 && |
| 349 | h->picture_structure == PICT_FRAME) |
| 350 | h->delta_poc[1] = get_se_golomb(&h->gb); |
| 351 | } |
| 352 | |
| 353 | /* Decode POC of this picture. |
| 354 | * The prev_ values needed for decoding POC of the next picture are not set here. */ |
| 355 | field_poc[0] = field_poc[1] = INT_MAX; |
| 356 | ff_init_poc(h, field_poc, &s->output_picture_number); |
| 357 | |
| 358 | /* Continue parsing to check if MMCO_RESET is present. |
| 359 | * FIXME: MMCO_RESET could appear in non-first slice. |
| 360 | * Maybe, we should parse all undisposable non-IDR slice of this |
| 361 | * picture until encountering MMCO_RESET in a slice of it. */ |
| 362 | if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) { |
| 363 | got_reset = scan_mmco_reset(s); |
| 364 | if (got_reset < 0) |
| 365 | return got_reset; |
| 366 | } |
| 367 | |
| 368 | /* Set up the prev_ values for decoding POC of the next picture. */ |
| 369 | h->prev_frame_num = got_reset ? 0 : h->frame_num; |
| 370 | h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset; |
| 371 | if (h->nal_ref_idc != 0) { |
| 372 | if (!got_reset) { |
| 373 | h->prev_poc_msb = h->poc_msb; |
| 374 | h->prev_poc_lsb = h->poc_lsb; |
| 375 | } else { |
| 376 | h->prev_poc_msb = 0; |
| 377 | h->prev_poc_lsb = |
| 378 | h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0]; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | if (h->sps.pic_struct_present_flag) { |
| 383 | switch (h->sei_pic_struct) { |
| 384 | case SEI_PIC_STRUCT_TOP_FIELD: |
| 385 | case SEI_PIC_STRUCT_BOTTOM_FIELD: |
| 386 | s->repeat_pict = 0; |
| 387 | break; |
| 388 | case SEI_PIC_STRUCT_FRAME: |
| 389 | case SEI_PIC_STRUCT_TOP_BOTTOM: |
| 390 | case SEI_PIC_STRUCT_BOTTOM_TOP: |
| 391 | s->repeat_pict = 1; |
| 392 | break; |
| 393 | case SEI_PIC_STRUCT_TOP_BOTTOM_TOP: |
| 394 | case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: |
| 395 | s->repeat_pict = 2; |
| 396 | break; |
| 397 | case SEI_PIC_STRUCT_FRAME_DOUBLING: |
| 398 | s->repeat_pict = 3; |
| 399 | break; |
| 400 | case SEI_PIC_STRUCT_FRAME_TRIPLING: |
| 401 | s->repeat_pict = 5; |
| 402 | break; |
| 403 | default: |
| 404 | s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0; |
| 405 | break; |
| 406 | } |
| 407 | } else { |
| 408 | s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0; |
| 409 | } |
| 410 | |
| 411 | if (h->picture_structure == PICT_FRAME) { |
| 412 | s->picture_structure = AV_PICTURE_STRUCTURE_FRAME; |
| 413 | if (h->sps.pic_struct_present_flag) { |
| 414 | switch (h->sei_pic_struct) { |
| 415 | case SEI_PIC_STRUCT_TOP_BOTTOM: |
| 416 | case SEI_PIC_STRUCT_TOP_BOTTOM_TOP: |
| 417 | s->field_order = AV_FIELD_TT; |
| 418 | break; |
| 419 | case SEI_PIC_STRUCT_BOTTOM_TOP: |
| 420 | case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: |
| 421 | s->field_order = AV_FIELD_BB; |
| 422 | break; |
| 423 | default: |
| 424 | s->field_order = AV_FIELD_PROGRESSIVE; |
| 425 | break; |
| 426 | } |
| 427 | } else { |
| 428 | if (field_poc[0] < field_poc[1]) |
| 429 | s->field_order = AV_FIELD_TT; |
| 430 | else if (field_poc[0] > field_poc[1]) |
| 431 | s->field_order = AV_FIELD_BB; |
| 432 | else |
| 433 | s->field_order = AV_FIELD_PROGRESSIVE; |
| 434 | } |
| 435 | } else { |
| 436 | if (h->picture_structure == PICT_TOP_FIELD) |
| 437 | s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD; |
| 438 | else |
| 439 | s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; |
| 440 | s->field_order = AV_FIELD_UNKNOWN; |
| 441 | } |
| 442 | |
| 443 | return 0; /* no need to evaluate the rest */ |
| 444 | } |
| 445 | } |
| 446 | if (q264) |
| 447 | return 0; |
| 448 | /* didn't find a picture! */ |
| 449 | av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size); |
| 450 | return -1; |
| 451 | } |
| 452 | |
| 453 | static int h264_parse(AVCodecParserContext *s, |
| 454 | AVCodecContext *avctx, |
| 455 | const uint8_t **poutbuf, int *poutbuf_size, |
| 456 | const uint8_t *buf, int buf_size) |
| 457 | { |
| 458 | H264Context *h = s->priv_data; |
| 459 | ParseContext *pc = &h->parse_context; |
| 460 | int next; |
| 461 | |
| 462 | if (!h->got_first) { |
| 463 | h->got_first = 1; |
| 464 | if (avctx->extradata_size) { |
| 465 | h->avctx = avctx; |
| 466 | // must be done like in decoder, otherwise opening the parser, |
| 467 | // letting it create extradata and then closing and opening again |
| 468 | // will cause has_b_frames to be always set. |
| 469 | // Note that estimate_timings_from_pts does exactly this. |
| 470 | if (!avctx->has_b_frames) |
| 471 | h->low_delay = 1; |
| 472 | ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
| 477 | next = buf_size; |
| 478 | } else { |
| 479 | next = h264_find_frame_end(h, buf, buf_size); |
| 480 | |
| 481 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
| 482 | *poutbuf = NULL; |
| 483 | *poutbuf_size = 0; |
| 484 | return buf_size; |
| 485 | } |
| 486 | |
| 487 | if (next < 0 && next != END_NOT_FOUND) { |
| 488 | av_assert1(pc->last_index + next >= 0); |
| 489 | h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); // update state |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | parse_nal_units(s, avctx, buf, buf_size); |
| 494 | |
| 495 | if (avctx->framerate.num) |
| 496 | avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1})); |
| 497 | if (h->sei_cpb_removal_delay >= 0) { |
| 498 | s->dts_sync_point = h->sei_buffering_period_present; |
| 499 | s->dts_ref_dts_delta = h->sei_cpb_removal_delay; |
| 500 | s->pts_dts_delta = h->sei_dpb_output_delay; |
| 501 | } else { |
| 502 | s->dts_sync_point = INT_MIN; |
| 503 | s->dts_ref_dts_delta = INT_MIN; |
| 504 | s->pts_dts_delta = INT_MIN; |
| 505 | } |
| 506 | |
| 507 | if (s->flags & PARSER_FLAG_ONCE) { |
| 508 | s->flags &= PARSER_FLAG_COMPLETE_FRAMES; |
| 509 | } |
| 510 | |
| 511 | *poutbuf = buf; |
| 512 | *poutbuf_size = buf_size; |
| 513 | return next; |
| 514 | } |
| 515 | |
| 516 | static int h264_split(AVCodecContext *avctx, |
| 517 | const uint8_t *buf, int buf_size) |
| 518 | { |
| 519 | int i; |
| 520 | uint32_t state = -1; |
| 521 | int has_sps = 0; |
| 522 | int has_pps = 0; |
| 523 | |
| 524 | for (i = 0; i <= buf_size; i++) { |
| 525 | if ((state & 0xFFFFFF1F) == 0x107) |
| 526 | has_sps = 1; |
| 527 | if ((state & 0xFFFFFF1F) == 0x108) |
| 528 | has_pps = 1; |
| 529 | /* if ((state&0xFFFFFF1F) == 0x101 || |
| 530 | * (state&0xFFFFFF1F) == 0x102 || |
| 531 | * (state&0xFFFFFF1F) == 0x105) { |
| 532 | * } |
| 533 | */ |
| 534 | if ((state & 0xFFFFFF00) == 0x100 && ((state & 0xFFFFFF1F) != 0x106 || has_pps) && |
| 535 | (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 && |
| 536 | (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d && |
| 537 | (state & 0xFFFFFF1F) != 0x10f) { |
| 538 | if (has_sps) { |
| 539 | while (i > 4 && buf[i - 5] == 0) |
| 540 | i--; |
| 541 | return i - 4; |
| 542 | } |
| 543 | } |
| 544 | if (i < buf_size) |
| 545 | state = (state << 8) | buf[i]; |
| 546 | } |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | static void close(AVCodecParserContext *s) |
| 551 | { |
| 552 | H264Context *h = s->priv_data; |
| 553 | ParseContext *pc = &h->parse_context; |
| 554 | |
| 555 | av_freep(&pc->buffer); |
| 556 | ff_h264_free_context(h); |
| 557 | } |
| 558 | |
| 559 | static av_cold int init(AVCodecParserContext *s) |
| 560 | { |
| 561 | H264Context *h = s->priv_data; |
| 562 | h->thread_context[0] = h; |
| 563 | h->slice_context_count = 1; |
| 564 | ff_h264dsp_init(&h->h264dsp, 8, 1); |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | AVCodecParser ff_h264_parser = { |
| 569 | .codec_ids = { AV_CODEC_ID_H264 }, |
| 570 | .priv_data_size = sizeof(H264Context), |
| 571 | .parser_init = init, |
| 572 | .parser_parse = h264_parse, |
| 573 | .parser_close = close, |
| 574 | .split = h264_split, |
| 575 | }; |