| /* | |
| * H.26L/H.264/AVC/JVT/14496-10/... parser | |
| * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * @file | |
| * H.264 / AVC / MPEG-4 part10 parser. | |
| * @author Michael Niedermayer <michaelni@gmx.at> | |
| */ | |
| #define UNCHECKED_BITSTREAM_READER 1 | |
| #include <stdint.h> | |
| #include "libavutil/avutil.h" | |
| #include "libavutil/error.h" | |
| #include "libavutil/log.h" | |
| #include "libavutil/mem.h" | |
| #include "libavutil/pixfmt.h" | |
| #include "avcodec.h" | |
| #include "get_bits.h" | |
| #include "golomb.h" | |
| #include "h264.h" | |
| #include "h264dsp.h" | |
| #include "h264_parse.h" | |
| #include "h264_sei.h" | |
| #include "h264_ps.h" | |
| #include "h2645_parse.h" | |
| #include "h264data.h" | |
| #include "mpegutils.h" | |
| #include "parser.h" | |
| #include "refstruct.h" | |
| #include "startcode.h" | |
| typedef struct H264ParseContext { | |
| ParseContext pc; | |
| H264ParamSets ps; | |
| H264DSPContext h264dsp; | |
| H264POCContext poc; | |
| H264SEIContext sei; | |
| int is_avc; | |
| int nal_length_size; | |
| int got_first; | |
| int picture_structure; | |
| uint8_t parse_history[6]; | |
| int parse_history_count; | |
| int parse_last_mb; | |
| int64_t reference_dts; | |
| int last_frame_num, last_picture_structure; | |
| } H264ParseContext; | |
| static int find_start_code(const uint8_t *buf, int buf_size, | |
| int buf_index, int next_avc) | |
| { | |
| uint32_t state = -1; | |
| buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1; | |
| return FFMIN(buf_index, buf_size); | |
| } | |
| static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, | |
| int buf_size, void *logctx) | |
| { | |
| int i, j; | |
| uint32_t state; | |
| ParseContext *pc = &p->pc; | |
| int next_avc = p->is_avc ? 0 : buf_size; | |
| // mb_addr= pc->mb_addr - 1; | |
| state = pc->state; | |
| if (state > 13) | |
| state = 7; | |
| if (p->is_avc && !p->nal_length_size) | |
| av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n"); | |
| for (i = 0; i < buf_size; i++) { | |
| if (i >= next_avc) { | |
| int64_t nalsize = 0; | |
| i = next_avc; | |
| for (j = 0; j < p->nal_length_size; j++) | |
| nalsize = (nalsize << 8) | buf[i++]; | |
| if (!nalsize || nalsize > buf_size - i) { | |
| av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %"PRId64" " | |
| "remaining %d\n", nalsize, buf_size - i); | |
| return buf_size; | |
| } | |
| next_avc = i + nalsize; | |
| state = 5; | |
| } | |
| if (state == 7) { | |
| i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i); | |
| if (i < next_avc) | |
| state = 2; | |
| } else if (state <= 2) { | |
| if (buf[i] == 1) | |
| state ^= 5; // 2->7, 1->4, 0->5 | |
| else if (buf[i]) | |
| state = 7; | |
| else | |
| state >>= 1; // 2->1, 1->0, 0->0 | |
| } else if (state <= 5) { | |
| int nalu_type = buf[i] & 0x1F; | |
| if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS || | |
| nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) { | |
| if (pc->frame_start_found) { | |
| i++; | |
| goto found; | |
| } | |
| } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA || | |
| nalu_type == H264_NAL_IDR_SLICE) { | |
| state += 8; | |
| continue; | |
| } | |
| state = 7; | |
| } else { | |
| unsigned int mb, last_mb = p->parse_last_mb; | |
| GetBitContext gb; | |
| p->parse_history[p->parse_history_count++] = buf[i]; | |
| init_get_bits(&gb, p->parse_history, 8*p->parse_history_count); | |
| mb= get_ue_golomb_long(&gb); | |
| if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) { | |
| p->parse_last_mb = mb; | |
| if (pc->frame_start_found) { | |
| if (mb <= last_mb) { | |
| i -= p->parse_history_count - 1; | |
| p->parse_history_count = 0; | |
| goto found; | |
| } | |
| } else | |
| pc->frame_start_found = 1; | |
| p->parse_history_count = 0; | |
| state = 7; | |
| } | |
| } | |
| } | |
| pc->state = state; | |
| if (p->is_avc) | |
| return next_avc; | |
| return END_NOT_FOUND; | |
| found: | |
| pc->state = 7; | |
| pc->frame_start_found = 0; | |
| if (p->is_avc) | |
| return next_avc; | |
| return i - (state & 5); | |
| } | |
| static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, | |
| void *logctx) | |
| { | |
| H264PredWeightTable pwt; | |
| int slice_type_nos = s->pict_type & 3; | |
| H264ParseContext *p = s->priv_data; | |
| int list_count, ref_count[2]; | |
| if (p->ps.pps->redundant_pic_cnt_present) | |
| get_ue_golomb(gb); // redundant_pic_count | |
| if (slice_type_nos == AV_PICTURE_TYPE_B) | |
| get_bits1(gb); // direct_spatial_mv_pred | |
| if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps, | |
| slice_type_nos, p->picture_structure, logctx) < 0) | |
| return AVERROR_INVALIDDATA; | |
| if (slice_type_nos != AV_PICTURE_TYPE_I) { | |
| int list; | |
| for (list = 0; list < list_count; list++) { | |
| if (get_bits1(gb)) { | |
| int index; | |
| for (index = 0; ; index++) { | |
| unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb); | |
| if (reordering_of_pic_nums_idc < 3) | |
| get_ue_golomb_long(gb); | |
| else if (reordering_of_pic_nums_idc > 3) { | |
| av_log(logctx, AV_LOG_ERROR, | |
| "illegal reordering_of_pic_nums_idc %d\n", | |
| reordering_of_pic_nums_idc); | |
| return AVERROR_INVALIDDATA; | |
| } else | |
| break; | |
| if (index >= ref_count[list]) { | |
| av_log(logctx, AV_LOG_ERROR, | |
| "reference count %d overflow\n", index); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) || | |
| (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B)) | |
| ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos, | |
| &pwt, p->picture_structure, logctx); | |
| if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag | |
| int i; | |
| for (i = 0; i < H264_MAX_MMCO_COUNT; i++) { | |
| MMCOOpcode opcode = get_ue_golomb_31(gb); | |
| if (opcode > (unsigned) MMCO_LONG) { | |
| av_log(logctx, AV_LOG_ERROR, | |
| "illegal memory management control operation %d\n", | |
| opcode); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (opcode == MMCO_END) | |
| return 0; | |
| else if (opcode == MMCO_RESET) | |
| return 1; | |
| if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) | |
| get_ue_golomb_long(gb); // difference_of_pic_nums_minus1 | |
| if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED || | |
| opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) | |
| get_ue_golomb_31(gb); | |
| } | |
| } | |
| return 0; | |
| } | |
| /** | |
| * Parse NAL units of found picture and decode some basic information. | |
| * | |
| * @param s parser context. | |
| * @param avctx codec context. | |
| * @param buf buffer with field/frame data. | |
| * @param buf_size size of the buffer. | |
| */ | |
| static inline int parse_nal_units(AVCodecParserContext *s, | |
| AVCodecContext *avctx, | |
| const uint8_t * const buf, int buf_size) | |
| { | |
| H264ParseContext *p = s->priv_data; | |
| H2645RBSP rbsp = { NULL }; | |
| H2645NAL nal = { NULL }; | |
| int buf_index, next_avc; | |
| unsigned int pps_id; | |
| unsigned int slice_type; | |
| int state = -1, got_reset = 0; | |
| int q264 = buf_size >=4 && !memcmp("Q264", buf, 4); | |
| int field_poc[2]; | |
| int ret; | |
| /* set some sane default values */ | |
| s->pict_type = AV_PICTURE_TYPE_I; | |
| s->key_frame = 0; | |
| s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN; | |
| ff_h264_sei_uninit(&p->sei); | |
| p->sei.common.frame_packing.arrangement_cancel_flag = -1; | |
| p->sei.common.unregistered.x264_build = -1; | |
| if (!buf_size) | |
| return 0; | |
| av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size); | |
| if (!rbsp.rbsp_buffer) | |
| return AVERROR(ENOMEM); | |
| buf_index = 0; | |
| next_avc = p->is_avc ? 0 : buf_size; | |
| for (;;) { | |
| const SPS *sps; | |
| int src_length, consumed, nalsize = 0; | |
| if (buf_index >= next_avc) { | |
| nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx); | |
| if (nalsize < 0) | |
| break; | |
| next_avc = buf_index + nalsize; | |
| } else { | |
| buf_index = find_start_code(buf, buf_size, buf_index, next_avc); | |
| if (buf_index >= buf_size) | |
| break; | |
| if (buf_index >= next_avc) | |
| continue; | |
| } | |
| src_length = next_avc - buf_index; | |
| state = buf[buf_index]; | |
| switch (state & 0x1f) { | |
| case H264_NAL_SLICE: | |
| case H264_NAL_IDR_SLICE: | |
| // Do not walk the whole buffer just to decode slice header | |
| if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) { | |
| /* IDR or disposable slice | |
| * No need to decode many bytes because MMCOs shall not be present. */ | |
| if (src_length > 60) | |
| src_length = 60; | |
| } else { | |
| /* To decode up to MMCOs */ | |
| if (src_length > 1000) | |
| src_length = 1000; | |
| } | |
| break; | |
| } | |
| consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1); | |
| if (consumed < 0) | |
| break; | |
| buf_index += consumed; | |
| ret = init_get_bits8(&nal.gb, nal.data, nal.size); | |
| if (ret < 0) | |
| goto fail; | |
| get_bits1(&nal.gb); | |
| nal.ref_idc = get_bits(&nal.gb, 2); | |
| nal.type = get_bits(&nal.gb, 5); | |
| switch (nal.type) { | |
| case H264_NAL_SPS: | |
| ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0); | |
| break; | |
| case H264_NAL_PPS: | |
| ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps, | |
| nal.size_bits); | |
| break; | |
| case H264_NAL_SEI: | |
| ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx); | |
| break; | |
| case H264_NAL_IDR_SLICE: | |
| s->key_frame = 1; | |
| p->poc.prev_frame_num = 0; | |
| p->poc.prev_frame_num_offset = 0; | |
| p->poc.prev_poc_msb = | |
| p->poc.prev_poc_lsb = 0; | |
| /* fall through */ | |
| case H264_NAL_SLICE: | |
| get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice | |
| slice_type = get_ue_golomb_31(&nal.gb); | |
| s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5]; | |
| if (p->sei.recovery_point.recovery_frame_cnt >= 0) { | |
| /* key frame, since recovery_frame_cnt is set */ | |
| s->key_frame = 1; | |
| } | |
| pps_id = get_ue_golomb(&nal.gb); | |
| if (pps_id >= MAX_PPS_COUNT) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "pps_id %u out of range\n", pps_id); | |
| goto fail; | |
| } | |
| if (!p->ps.pps_list[pps_id]) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "non-existing PPS %u referenced\n", pps_id); | |
| goto fail; | |
| } | |
| ff_refstruct_replace(&p->ps.pps, p->ps.pps_list[pps_id]); | |
| p->ps.sps = p->ps.pps->sps; | |
| sps = p->ps.sps; | |
| // heuristic to detect non marked keyframes | |
| if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I) | |
| s->key_frame = 1; | |
| p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num); | |
| s->coded_width = 16 * sps->mb_width; | |
| s->coded_height = 16 * sps->mb_height; | |
| s->width = s->coded_width - (sps->crop_right + sps->crop_left); | |
| s->height = s->coded_height - (sps->crop_top + sps->crop_bottom); | |
| if (s->width <= 0 || s->height <= 0) { | |
| s->width = s->coded_width; | |
| s->height = s->coded_height; | |
| } | |
| switch (sps->bit_depth_luma) { | |
| case 9: | |
| if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9; | |
| else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9; | |
| else s->format = AV_PIX_FMT_YUV420P9; | |
| break; | |
| case 10: | |
| if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10; | |
| else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10; | |
| else s->format = AV_PIX_FMT_YUV420P10; | |
| break; | |
| case 8: | |
| if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P; | |
| else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P; | |
| else s->format = AV_PIX_FMT_YUV420P; | |
| break; | |
| default: | |
| s->format = AV_PIX_FMT_NONE; | |
| } | |
| avctx->profile = ff_h264_get_profile(sps); | |
| avctx->level = sps->level_idc; | |
| if (sps->frame_mbs_only_flag) { | |
| p->picture_structure = PICT_FRAME; | |
| } else { | |
| if (get_bits1(&nal.gb)) { // field_pic_flag | |
| p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag | |
| } else { | |
| p->picture_structure = PICT_FRAME; | |
| } | |
| } | |
| if (nal.type == H264_NAL_IDR_SLICE) | |
| get_ue_golomb_long(&nal.gb); /* idr_pic_id */ | |
| if (sps->poc_type == 0) { | |
| p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb); | |
| if (p->ps.pps->pic_order_present == 1 && | |
| p->picture_structure == PICT_FRAME) | |
| p->poc.delta_poc_bottom = get_se_golomb(&nal.gb); | |
| } | |
| if (sps->poc_type == 1 && | |
| !sps->delta_pic_order_always_zero_flag) { | |
| p->poc.delta_poc[0] = get_se_golomb(&nal.gb); | |
| if (p->ps.pps->pic_order_present == 1 && | |
| p->picture_structure == PICT_FRAME) | |
| p->poc.delta_poc[1] = get_se_golomb(&nal.gb); | |
| } | |
| /* Decode POC of this picture. | |
| * The prev_ values needed for decoding POC of the next picture are not set here. */ | |
| field_poc[0] = field_poc[1] = INT_MAX; | |
| ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps, | |
| &p->poc, p->picture_structure, nal.ref_idc); | |
| if (ret < 0) | |
| goto fail; | |
| /* Continue parsing to check if MMCO_RESET is present. | |
| * FIXME: MMCO_RESET could appear in non-first slice. | |
| * Maybe, we should parse all undisposable non-IDR slice of this | |
| * picture until encountering MMCO_RESET in a slice of it. */ | |
| if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) { | |
| got_reset = scan_mmco_reset(s, &nal.gb, avctx); | |
| if (got_reset < 0) | |
| goto fail; | |
| } | |
| /* Set up the prev_ values for decoding POC of the next picture. */ | |
| p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num; | |
| p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset; | |
| if (nal.ref_idc != 0) { | |
| if (!got_reset) { | |
| p->poc.prev_poc_msb = p->poc.poc_msb; | |
| p->poc.prev_poc_lsb = p->poc.poc_lsb; | |
| } else { | |
| p->poc.prev_poc_msb = 0; | |
| p->poc.prev_poc_lsb = | |
| p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0]; | |
| } | |
| } | |
| if (p->sei.picture_timing.present) { | |
| ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing, | |
| sps, avctx); | |
| if (ret < 0) { | |
| av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n"); | |
| p->sei.picture_timing.present = 0; | |
| } | |
| } | |
| if (sps->pic_struct_present_flag && p->sei.picture_timing.present) { | |
| switch (p->sei.picture_timing.pic_struct) { | |
| case H264_SEI_PIC_STRUCT_TOP_FIELD: | |
| case H264_SEI_PIC_STRUCT_BOTTOM_FIELD: | |
| s->repeat_pict = 0; | |
| break; | |
| case H264_SEI_PIC_STRUCT_FRAME: | |
| case H264_SEI_PIC_STRUCT_TOP_BOTTOM: | |
| case H264_SEI_PIC_STRUCT_BOTTOM_TOP: | |
| s->repeat_pict = 1; | |
| break; | |
| case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP: | |
| case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: | |
| s->repeat_pict = 2; | |
| break; | |
| case H264_SEI_PIC_STRUCT_FRAME_DOUBLING: | |
| s->repeat_pict = 3; | |
| break; | |
| case H264_SEI_PIC_STRUCT_FRAME_TRIPLING: | |
| s->repeat_pict = 5; | |
| break; | |
| default: | |
| s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0; | |
| break; | |
| } | |
| } else { | |
| s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0; | |
| } | |
| if (p->picture_structure == PICT_FRAME) { | |
| s->picture_structure = AV_PICTURE_STRUCTURE_FRAME; | |
| if (sps->pic_struct_present_flag && p->sei.picture_timing.present) { | |
| switch (p->sei.picture_timing.pic_struct) { | |
| case H264_SEI_PIC_STRUCT_TOP_BOTTOM: | |
| case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP: | |
| s->field_order = AV_FIELD_TT; | |
| break; | |
| case H264_SEI_PIC_STRUCT_BOTTOM_TOP: | |
| case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: | |
| s->field_order = AV_FIELD_BB; | |
| break; | |
| default: | |
| s->field_order = AV_FIELD_PROGRESSIVE; | |
| break; | |
| } | |
| } else { | |
| if (field_poc[0] < field_poc[1]) | |
| s->field_order = AV_FIELD_TT; | |
| else if (field_poc[0] > field_poc[1]) | |
| s->field_order = AV_FIELD_BB; | |
| else | |
| s->field_order = AV_FIELD_PROGRESSIVE; | |
| } | |
| } else { | |
| if (p->picture_structure == PICT_TOP_FIELD) | |
| s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD; | |
| else | |
| s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; | |
| if (p->poc.frame_num == p->last_frame_num && | |
| p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN && | |
| p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME && | |
| p->last_picture_structure != s->picture_structure) { | |
| if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD) | |
| s->field_order = AV_FIELD_TT; | |
| else | |
| s->field_order = AV_FIELD_BB; | |
| } else { | |
| s->field_order = AV_FIELD_UNKNOWN; | |
| } | |
| p->last_picture_structure = s->picture_structure; | |
| p->last_frame_num = p->poc.frame_num; | |
| } | |
| if (sps->timing_info_present_flag) { | |
| int64_t den = sps->time_scale; | |
| if (p->sei.common.unregistered.x264_build < 44U) | |
| den *= 2; | |
| av_reduce(&avctx->framerate.den, &avctx->framerate.num, | |
| sps->num_units_in_tick * 2, den, 1 << 30); | |
| } | |
| av_freep(&rbsp.rbsp_buffer); | |
| return 0; /* no need to evaluate the rest */ | |
| } | |
| } | |
| if (q264) { | |
| av_freep(&rbsp.rbsp_buffer); | |
| return 0; | |
| } | |
| /* didn't find a picture! */ | |
| av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size); | |
| fail: | |
| av_freep(&rbsp.rbsp_buffer); | |
| return -1; | |
| } | |
| static int h264_parse(AVCodecParserContext *s, | |
| AVCodecContext *avctx, | |
| const uint8_t **poutbuf, int *poutbuf_size, | |
| const uint8_t *buf, int buf_size) | |
| { | |
| H264ParseContext *p = s->priv_data; | |
| ParseContext *pc = &p->pc; | |
| AVRational time_base = { 0, 1 }; | |
| int next; | |
| if (!p->got_first) { | |
| p->got_first = 1; | |
| if (avctx->extradata_size) { | |
| ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size, | |
| &p->ps, &p->is_avc, &p->nal_length_size, | |
| avctx->err_recognition, avctx); | |
| } | |
| } | |
| if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { | |
| next = buf_size; | |
| } else { | |
| next = h264_find_frame_end(p, buf, buf_size, avctx); | |
| if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { | |
| *poutbuf = NULL; | |
| *poutbuf_size = 0; | |
| return buf_size; | |
| } | |
| if (next < 0 && next != END_NOT_FOUND) { | |
| av_assert1(pc->last_index + next >= 0); | |
| h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state | |
| } | |
| } | |
| parse_nal_units(s, avctx, buf, buf_size); | |
| if (avctx->framerate.num) | |
| time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){2, 1})); | |
| if (p->sei.picture_timing.cpb_removal_delay >= 0) { | |
| s->dts_sync_point = p->sei.buffering_period.present; | |
| s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay; | |
| s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay; | |
| } else { | |
| s->dts_sync_point = INT_MIN; | |
| s->dts_ref_dts_delta = INT_MIN; | |
| s->pts_dts_delta = INT_MIN; | |
| } | |
| if (s->flags & PARSER_FLAG_ONCE) { | |
| s->flags &= PARSER_FLAG_COMPLETE_FRAMES; | |
| } | |
| if (s->dts_sync_point >= 0) { | |
| int64_t den = time_base.den * (int64_t)avctx->pkt_timebase.num; | |
| if (den > 0) { | |
| int64_t num = time_base.num * (int64_t)avctx->pkt_timebase.den; | |
| if (s->dts != AV_NOPTS_VALUE) { | |
| // got DTS from the stream, update reference timestamp | |
| p->reference_dts = av_sat_sub64(s->dts, av_rescale(s->dts_ref_dts_delta, num, den)); | |
| } else if (p->reference_dts != AV_NOPTS_VALUE) { | |
| // compute DTS based on reference timestamp | |
| s->dts = av_sat_add64(p->reference_dts, av_rescale(s->dts_ref_dts_delta, num, den)); | |
| } | |
| if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE) | |
| s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den); | |
| if (s->dts_sync_point > 0) | |
| p->reference_dts = s->dts; // new reference | |
| } | |
| } | |
| *poutbuf = buf; | |
| *poutbuf_size = buf_size; | |
| return next; | |
| } | |
| static void h264_close(AVCodecParserContext *s) | |
| { | |
| H264ParseContext *p = s->priv_data; | |
| ParseContext *pc = &p->pc; | |
| av_freep(&pc->buffer); | |
| ff_h264_sei_uninit(&p->sei); | |
| ff_h264_ps_uninit(&p->ps); | |
| } | |
| static av_cold int init(AVCodecParserContext *s) | |
| { | |
| H264ParseContext *p = s->priv_data; | |
| p->reference_dts = AV_NOPTS_VALUE; | |
| p->last_frame_num = INT_MAX; | |
| ff_h264dsp_init(&p->h264dsp, 8, 1); | |
| return 0; | |
| } | |
| const AVCodecParser ff_h264_parser = { | |
| .codec_ids = { AV_CODEC_ID_H264 }, | |
| .priv_data_size = sizeof(H264ParseContext), | |
| .parser_init = init, | |
| .parser_parse = h264_parse, | |
| .parser_close = h264_close, | |
| }; |