* H.26L/H.264/AVC/JVT/14496-10/... parser
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
- * 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 libavcodec/h264_parser.c
+ * @file
* H.264 / AVC / MPEG4 part10 parser.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include "parser.h"
-#include "h264_parser.h"
#include "h264data.h"
#include "golomb.h"
#include <assert.h>
-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;
else state>>=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;
return i-(state&5);
}
-/*!
+/**
* Parse NAL units of found picture and decode some basic information.
*
* @param s parser context.
{
H264Context *h = s->priv_data;
const uint8_t *buf_end = buf + buf_size;
+ unsigned int pps_id;
unsigned int slice_type;
- int state;
+ int state = -1;
const uint8_t *ptr;
/* set some sane default values */
- s->pict_type = FF_I_TYPE;
+ 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 = ff_find_start_code(buf, buf_end, &state);
+ buf = avpriv_mpv_find_start_code(buf, buf_end, &state);
if(buf >= buf_end)
break;
--buf;
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;
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{
assert(pc->last_index + next >= 0 );
ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
}
+ }
+
+ parse_nal_units(s, avctx, buf, buf_size);
- 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;
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,
- 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,
};
projects / ffmpeg / blobdiff