av_free() -> av_freep(), patch by Reimar Doffinger, see discussion in
[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/**
23 * @file h264_parser.c
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){
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47#ifdef HAVE_FAST_UNALIGNED
48# ifdef HAVE_FAST_64BIT
49 while(i<buf_size && !((~*(uint64_t*)(buf+i) & (*(uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
50 i+=8;
51# else
52 while(i<buf_size && !((~*(uint32_t*)(buf+i) & (*(uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
53 i+=4;
54# endif
55#endif
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56 for(; i<buf_size; i++){
57 if(!buf[i]){
58 state=2;
59 break;
60 }
61 }
62 }else if(state<=2){
63 if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
64 else if(buf[i]) state = 7;
65 else state>>=1; //2->1, 1->0, 0->0
66 }else if(state<=5){
67 int v= buf[i] & 0x1F;
68 if(v==7 || v==8 || v==9){
69 if(pc->frame_start_found){
70 i++;
9aa1cfec 71 goto found;
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72 }
73 }else if(v==1 || v==2 || v==5){
74 if(pc->frame_start_found){
75 state+=8;
76 continue;
77 }else
78 pc->frame_start_found = 1;
79 }
80 state= 7;
81 }else{
82 if(buf[i] & 0x80)
83 goto found;
84 state= 7;
85 }
86 }
87 pc->state= state;
88 return END_NOT_FOUND;
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89
90found:
91 pc->state=7;
92 pc->frame_start_found= 0;
93 return i-(state&5);
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94}
95
96static int h264_parse(AVCodecParserContext *s,
97 AVCodecContext *avctx,
98 const uint8_t **poutbuf, int *poutbuf_size,
99 const uint8_t *buf, int buf_size)
100{
101 H264Context *h = s->priv_data;
102 ParseContext *pc = &h->s.parse_context;
103 int next;
104
105 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
106 next= buf_size;
107 }else{
108 next= ff_h264_find_frame_end(h, buf, buf_size);
109
110 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
111 *poutbuf = NULL;
112 *poutbuf_size = 0;
113 return buf_size;
114 }
115
116 if(next<0 && next != END_NOT_FOUND){
117 assert(pc->last_index + next >= 0 );
118 ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
119 }
120 }
121
122 *poutbuf = buf;
123 *poutbuf_size = buf_size;
124 return next;
125}
126
127static int h264_split(AVCodecContext *avctx,
128 const uint8_t *buf, int buf_size)
129{
130 int i;
131 uint32_t state = -1;
132 int has_sps= 0;
133
134 for(i=0; i<=buf_size; i++){
135 if((state&0xFFFFFF1F) == 0x107)
136 has_sps=1;
137/* if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
138 }*/
139 if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
140 if(has_sps){
141 while(i>4 && buf[i-5]==0) i--;
142 return i-4;
143 }
144 }
145 if (i<buf_size)
146 state= (state<<8) | buf[i];
147 }
148 return 0;
149}
150
dd990075 151static void close(AVCodecParserContext *s)
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152{
153 H264Context *h = s->priv_data;
154 ParseContext *pc = &h->s.parse_context;
155
156 av_free(pc->buffer);
157}
158
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159
160AVCodecParser h264_parser = {
161 { CODEC_ID_H264 },
162 sizeof(H264Context),
163 NULL,
164 h264_parse,
3ee4f5e4 165 close,
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166 h264_split,
167};