Make the following H264 functions available to the parser:
[libav.git] / libavcodec / h264_parser.c
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1/*
2 * H.26L/H.264/AVC/JVT/14496-10/... parser
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
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20 */
21
22/**
bad5537e 23 * @file libavcodec/h264_parser.c
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24 * H.264 / AVC / MPEG4 part10 parser.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28#include "parser.h"
29#include "h264_parser.h"
30
31#include <assert.h>
32
33
34int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
35{
36 int i;
37 uint32_t state;
38 ParseContext *pc = &(h->s.parse_context);
39//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
40// mb_addr= pc->mb_addr - 1;
41 state= pc->state;
42 if(state>13)
43 state= 7;
44
45 for(i=0; i<buf_size; i++){
46 if(state==7){
b250f9c6 47#if HAVE_FAST_UNALIGNED
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48 /* we check i<buf_size instead of i+3/7 because its simpler
49 * and there should be FF_INPUT_BUFFER_PADDING_SIZE bytes at the end
50 */
b250f9c6 51# if HAVE_FAST_64BIT
4d8eb2e8 52 while(i<buf_size && !((~*(const uint64_t*)(buf+i) & (*(const uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
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53 i+=8;
54# else
4d8eb2e8 55 while(i<buf_size && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
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56 i+=4;
57# endif
58#endif
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59 for(; i<buf_size; i++){
60 if(!buf[i]){
61 state=2;
62 break;
63 }
64 }
65 }else if(state<=2){
66 if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
67 else if(buf[i]) state = 7;
68 else state>>=1; //2->1, 1->0, 0->0
69 }else if(state<=5){
70 int v= buf[i] & 0x1F;
71 if(v==7 || v==8 || v==9){
72 if(pc->frame_start_found){
73 i++;
9aa1cfec 74 goto found;
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75 }
76 }else if(v==1 || v==2 || v==5){
77 if(pc->frame_start_found){
78 state+=8;
79 continue;
80 }else
81 pc->frame_start_found = 1;
82 }
83 state= 7;
84 }else{
85 if(buf[i] & 0x80)
86 goto found;
87 state= 7;
88 }
89 }
90 pc->state= state;
91 return END_NOT_FOUND;
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92
93found:
94 pc->state=7;
95 pc->frame_start_found= 0;
96 return i-(state&5);
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97}
98
99static int h264_parse(AVCodecParserContext *s,
100 AVCodecContext *avctx,
101 const uint8_t **poutbuf, int *poutbuf_size,
102 const uint8_t *buf, int buf_size)
103{
104 H264Context *h = s->priv_data;
105 ParseContext *pc = &h->s.parse_context;
106 int next;
107
108 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
109 next= buf_size;
110 }else{
111 next= ff_h264_find_frame_end(h, buf, buf_size);
112
113 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
114 *poutbuf = NULL;
115 *poutbuf_size = 0;
116 return buf_size;
117 }
118
119 if(next<0 && next != END_NOT_FOUND){
120 assert(pc->last_index + next >= 0 );
121 ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
122 }
123 }
124
125 *poutbuf = buf;
126 *poutbuf_size = buf_size;
127 return next;
128}
129
130static int h264_split(AVCodecContext *avctx,
131 const uint8_t *buf, int buf_size)
132{
133 int i;
134 uint32_t state = -1;
135 int has_sps= 0;
136
137 for(i=0; i<=buf_size; i++){
138 if((state&0xFFFFFF1F) == 0x107)
139 has_sps=1;
140/* if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
141 }*/
142 if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
143 if(has_sps){
144 while(i>4 && buf[i-5]==0) i--;
145 return i-4;
146 }
147 }
148 if (i<buf_size)
149 state= (state<<8) | buf[i];
150 }
151 return 0;
152}
153
dd990075 154static void close(AVCodecParserContext *s)
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155{
156 H264Context *h = s->priv_data;
157 ParseContext *pc = &h->s.parse_context;
158
159 av_free(pc->buffer);
160}
161
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162
163AVCodecParser h264_parser = {
0d3d172f 164 { CODEC_ID_H264 },
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165 sizeof(H264Context),
166 NULL,
167 h264_parse,
3ee4f5e4 168 close,
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169 h264_split,
170};