X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fh264_parser.c;h=48215c5ada4966ccd7be83e2121dde6e2f930551;hb=34e1b0754638ea6e0356239aad01e74de3a582a5;hp=73b156964c3a9440eb39c1548541c9df86abbfce;hpb=9aa1cfec1a8597f3bd0f9fa564c43a53e42fab25;p=ffmpeg diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c index 73b156964c3..48215c5ada4 100644 --- a/libavcodec/h264_parser.c +++ b/libavcodec/h264_parser.c @@ -2,36 +2,37 @@ * H.26L/H.264/AVC/JVT/14496-10/... parser * Copyright (c) 2003 Michael Niedermayer * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file h264_parser.c + * @file * H.264 / AVC / MPEG4 part10 parser. * @author Michael Niedermayer */ #include "parser.h" -#include "h264_parser.h" +#include "h264data.h" +#include "golomb.h" #include -int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size) +static int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size) { int i; uint32_t state; @@ -44,6 +45,18 @@ int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size) for(i=0; i>=1; //2->1, 1->0, 0->0 }else if(state<=5){ int v= buf[i] & 0x1F; - if(v==7 || v==8 || v==9){ + if(v==6 || v==7 || v==8 || v==9){ if(pc->frame_start_found){ i++; goto found; @@ -84,6 +97,147 @@ found: return i-(state&5); } +/** + * 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 *buf, int buf_size) +{ + H264Context *h = s->priv_data; + const uint8_t *buf_end = buf + buf_size; + unsigned int pps_id; + unsigned int slice_type; + int state = -1; + const uint8_t *ptr; + + /* set some sane default values */ + s->pict_type = AV_PICTURE_TYPE_I; + s->key_frame = 0; + + h->s.avctx= avctx; + h->sei_recovery_frame_cnt = -1; + h->sei_dpb_output_delay = 0; + h->sei_cpb_removal_delay = -1; + h->sei_buffering_period_present = 0; + + if (!buf_size) + return 0; + + for(;;) { + int src_length, dst_length, consumed; + buf = avpriv_mpv_find_start_code(buf, buf_end, &state); + if(buf >= buf_end) + break; + --buf; + src_length = buf_end - buf; + switch (state & 0x1f) { + case NAL_SLICE: + case NAL_IDR_SLICE: + // Do not walk the whole buffer just to decode slice header + if (src_length > 20) + src_length = 20; + break; + } + ptr= ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length); + if (ptr==NULL || dst_length < 0) + break; + + init_get_bits(&h->s.gb, ptr, 8*dst_length); + switch(h->nal_unit_type) { + case NAL_SPS: + ff_h264_decode_seq_parameter_set(h); + break; + case NAL_PPS: + ff_h264_decode_picture_parameter_set(h, h->s.gb.size_in_bits); + break; + case NAL_SEI: + ff_h264_decode_sei(h); + break; + case NAL_IDR_SLICE: + s->key_frame = 1; + /* fall through */ + case NAL_SLICE: + get_ue_golomb(&h->s.gb); // skip first_mb_in_slice + slice_type = get_ue_golomb_31(&h->s.gb); + s->pict_type = golomb_to_pict_type[slice_type % 5]; + if (h->sei_recovery_frame_cnt >= 0) { + /* key frame, since recovery_frame_cnt is set */ + s->key_frame = 1; + } + pps_id= get_ue_golomb(&h->s.gb); + if(pps_id>=MAX_PPS_COUNT) { + av_log(h->s.avctx, AV_LOG_ERROR, "pps_id out of range\n"); + return -1; + } + if(!h->pps_buffers[pps_id]) { + av_log(h->s.avctx, AV_LOG_ERROR, "non-existing PPS referenced\n"); + return -1; + } + h->pps= *h->pps_buffers[pps_id]; + if(!h->sps_buffers[h->pps.sps_id]) { + av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS referenced\n"); + return -1; + } + h->sps = *h->sps_buffers[h->pps.sps_id]; + h->frame_num = get_bits(&h->s.gb, h->sps.log2_max_frame_num); + + avctx->profile = ff_h264_get_profile(&h->sps); + avctx->level = h->sps.level_idc; + + if(h->sps.frame_mbs_only_flag){ + h->s.picture_structure= PICT_FRAME; + }else{ + if(get_bits1(&h->s.gb)) { //field_pic_flag + h->s.picture_structure= PICT_TOP_FIELD + get_bits1(&h->s.gb); //bottom_field_flag + } else { + h->s.picture_structure= PICT_FRAME; + } + } + + if(h->sps.pic_struct_present_flag) { + switch (h->sei_pic_struct) { + case SEI_PIC_STRUCT_TOP_FIELD: + case SEI_PIC_STRUCT_BOTTOM_FIELD: + s->repeat_pict = 0; + break; + case SEI_PIC_STRUCT_FRAME: + case SEI_PIC_STRUCT_TOP_BOTTOM: + case SEI_PIC_STRUCT_BOTTOM_TOP: + s->repeat_pict = 1; + break; + case SEI_PIC_STRUCT_TOP_BOTTOM_TOP: + case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: + s->repeat_pict = 2; + break; + case SEI_PIC_STRUCT_FRAME_DOUBLING: + s->repeat_pict = 3; + break; + case SEI_PIC_STRUCT_FRAME_TRIPLING: + s->repeat_pict = 5; + break; + default: + s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0; + break; + } + } else { + s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0; + } + + return 0; /* no need to evaluate the rest */ + } + buf += consumed; + } + /* didn't find a picture! */ + av_log(h->s.avctx, AV_LOG_ERROR, "missing picture in access unit\n"); + return -1; +} + static int h264_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, @@ -93,6 +247,21 @@ static int h264_parse(AVCodecParserContext *s, ParseContext *pc = &h->s.parse_context; int next; + if (!h->got_first) { + h->got_first = 1; + if (avctx->extradata_size) { + h->s.avctx = avctx; + // must be done like in the decoder. + // otherwise opening the parser, creating extradata, + // and then closing and opening again + // will cause has_b_frames to be always set. + // NB: estimate_timings_from_pts behaves exactly like this. + if (!avctx->has_b_frames) + h->s.low_delay = 1; + ff_h264_decode_extradata(h); + } + } + if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ next= buf_size; }else{ @@ -110,6 +279,22 @@ static int h264_parse(AVCodecParserContext *s, } } + parse_nal_units(s, avctx, buf, buf_size); + + if (h->sei_cpb_removal_delay >= 0) { + s->dts_sync_point = h->sei_buffering_period_present; + s->dts_ref_dts_delta = h->sei_cpb_removal_delay; + s->pts_dts_delta = h->sei_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; + } + *poutbuf = buf; *poutbuf_size = buf_size; return next; @@ -139,12 +324,28 @@ static int h264_split(AVCodecContext *avctx, return 0; } +static void close(AVCodecParserContext *s) +{ + H264Context *h = s->priv_data; + ParseContext *pc = &h->s.parse_context; + + av_free(pc->buffer); + ff_h264_free_context(h); +} + +static int init(AVCodecParserContext *s) +{ + H264Context *h = s->priv_data; + h->thread_context[0] = h; + h->s.slice_context_count = 1; + return 0; +} -AVCodecParser h264_parser = { - { CODEC_ID_H264 }, - sizeof(H264Context), - NULL, - h264_parse, - ff_parse_close, - h264_split, +AVCodecParser ff_h264_parser = { + .codec_ids = { CODEC_ID_H264 }, + .priv_data_size = sizeof(H264Context), + .parser_init = init, + .parser_parse = h264_parse, + .parser_close = close, + .split = h264_split, };