| /* |
| * 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> |
| */ |
| |
| #include <assert.h> |
| #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 "h264_sei.h" |
| #include "h264_ps.h" |
| #include "h264data.h" |
| #include "internal.h" |
| #include "mpegutils.h" |
| #include "parser.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 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) { |
| int nalsize = 0; |
| i = next_avc; |
| for (j = 0; j < p->nal_length_size; j++) |
| nalsize = (nalsize << 8) | buf[i++]; |
| if (nalsize <= 0 || nalsize > buf_size - i) { |
| av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d 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 < 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.frame_packing.arrangement_cancel_flag = -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; |
| } |
| |
| av_buffer_unref(&p->ps.pps_ref); |
| p->ps.pps = NULL; |
| p->ps.sps = NULL; |
| p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]); |
| if (!p->ps.pps_ref) |
| goto fail; |
| p->ps.pps = (const PPS*)p->ps.pps_ref->data; |
| 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; |
| } |
| |
| 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; |
| 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) |
| avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 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 = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num; |
| if (den > 0) { |
| int64_t num = avctx->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 = 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 = 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 int h264_split(AVCodecContext *avctx, |
| const uint8_t *buf, int buf_size) |
| { |
| uint32_t state = -1; |
| int has_sps = 0; |
| int has_pps = 0; |
| const uint8_t *ptr = buf, *end = buf + buf_size; |
| int nalu_type; |
| |
| while (ptr < end) { |
| ptr = avpriv_find_start_code(ptr, end, &state); |
| if ((state & 0xFFFFFF00) != 0x100) |
| break; |
| nalu_type = state & 0x1F; |
| if (nalu_type == H264_NAL_SPS) { |
| has_sps = 1; |
| } else if (nalu_type == H264_NAL_PPS) |
| has_pps = 1; |
| /* else if (nalu_type == 0x01 || |
| * nalu_type == 0x02 || |
| * nalu_type == 0x05) { |
| * } |
| */ |
| else if ((nalu_type != H264_NAL_SEI || has_pps) && |
| nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT && |
| nalu_type != 0x0f) { |
| if (has_sps) { |
| while (ptr - 4 > buf && ptr[-5] == 0) |
| ptr--; |
| return ptr - 4 - buf; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| 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, |
| .split = h264_split, |
| }; |