2 * H.26L/H.264/AVC/JVT/14496-10/... parser
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
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.
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.
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
25 * H.264 / AVC / MPEG4 part10 parser.
26 * @author Michael Niedermayer <michaelni@gmx.at>
30 #include "h264_parser.h"
35 int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
39 ParseContext *pc = &(h->s.parse_context);
40 //printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
41 // mb_addr= pc->mb_addr - 1;
46 for(i=0; i<buf_size; i++){
48 for(; i<buf_size; i++){
55 if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
56 else if(buf[i]) state = 7;
57 else state>>=1; //2->1, 1->0, 0->0
60 if(v==7 || v==8 || v==9){
61 if(pc->frame_start_found){
65 pc->frame_start_found= 0;
68 }else if(v==1 || v==2 || v==5){
69 if(pc->frame_start_found){
73 pc->frame_start_found = 1;
86 static int h264_parse(AVCodecParserContext *s,
87 AVCodecContext *avctx,
88 const uint8_t **poutbuf, int *poutbuf_size,
89 const uint8_t *buf, int buf_size)
91 H264Context *h = s->priv_data;
92 ParseContext *pc = &h->s.parse_context;
95 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
98 next= ff_h264_find_frame_end(h, buf, buf_size);
100 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
106 if(next<0 && next != END_NOT_FOUND){
107 assert(pc->last_index + next >= 0 );
108 ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
113 *poutbuf_size = buf_size;
117 static int h264_split(AVCodecContext *avctx,
118 const uint8_t *buf, int buf_size)
124 for(i=0; i<=buf_size; i++){
125 if((state&0xFFFFFF1F) == 0x107)
127 /* if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
129 if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
131 while(i>4 && buf[i-5]==0) i--;
136 state= (state<<8) | buf[i];
142 AVCodecParser h264_parser = {