summaryrefslogtreecommitdiff
path: root/libavcodec/mjpeg_parser.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavcodec/mjpeg_parser.c')
-rw-r--r--libavcodec/mjpeg_parser.c68
1 files changed, 49 insertions, 19 deletions
diff --git a/libavcodec/mjpeg_parser.c b/libavcodec/mjpeg_parser.c
index 5b83e59dcd..40841c3b37 100644
--- a/libavcodec/mjpeg_parser.c
+++ b/libavcodec/mjpeg_parser.c
@@ -4,20 +4,20 @@
* Copyright (c) 2003 Alex Beregszaszi
* Copyright (c) 2003-2004 Michael Niedermayer
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -28,27 +28,44 @@
#include "parser.h"
+typedef struct MJPEGParserContext{
+ ParseContext pc;
+ int size;
+}MJPEGParserContext;
/**
* Find the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or -1
*/
-static int find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
+static int find_frame_end(MJPEGParserContext *m, const uint8_t *buf, int buf_size){
+ ParseContext *pc= &m->pc;
int vop_found, i;
- uint16_t state;
+ uint32_t state;
vop_found= pc->frame_start_found;
state= pc->state;
i=0;
if(!vop_found){
- for(i=0; i<buf_size; i++){
+ for(i=0; i<buf_size;){
state= (state<<8) | buf[i];
- if(state == 0xFFD8){
- i++;
- vop_found=1;
- break;
+ if(state>=0xFFC00000 && state<=0xFFFEFFFF){
+ if(state>=0xFFD80000 && state<=0xFFD8FFFF){
+ i++;
+ vop_found=1;
+ break;
+ }else if(state<0xFFD00000 || state>0xFFD9FFFF){
+ m->size= (state&0xFFFF)-1;
+ }
}
+ if(m->size>0){
+ int size= FFMIN(buf_size-i, m->size);
+ i+=size;
+ m->size-=size;
+ state=0;
+ continue;
+ }else
+ i++;
}
}
@@ -56,13 +73,25 @@ static int find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
/* EOF considered as end of frame */
if (buf_size == 0)
return 0;
- for(; i<buf_size; i++){
+ for(; i<buf_size;){
state= (state<<8) | buf[i];
- if(state == 0xFFD8){
- pc->frame_start_found=0;
- pc->state=0;
- return i-1;
+ if(state>=0xFFC00000 && state<=0xFFFEFFFF){
+ if(state>=0xFFD80000 && state<=0xFFD8FFFF){
+ pc->frame_start_found=0;
+ pc->state=0;
+ return i-3;
+ } else if(state<0xFFD00000 || state>0xFFD9FFFF){
+ m->size= (state&0xFFFF)-1;
+ }
}
+ if(m->size>0){
+ int size= FFMIN(buf_size-i, m->size);
+ i+=size;
+ m->size-=size;
+ state=0;
+ continue;
+ }else
+ i++;
}
}
pc->frame_start_found= vop_found;
@@ -75,13 +104,14 @@ static int jpeg_parse(AVCodecParserContext *s,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
- ParseContext *pc = s->priv_data;
+ MJPEGParserContext *m = s->priv_data;
+ ParseContext *pc = &m->pc;
int next;
if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
next= buf_size;
}else{
- next= find_frame_end(pc, buf, buf_size);
+ next= find_frame_end(m, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
@@ -98,7 +128,7 @@ static int jpeg_parse(AVCodecParserContext *s,
AVCodecParser ff_mjpeg_parser = {
.codec_ids = { CODEC_ID_MJPEG },
- .priv_data_size = sizeof(ParseContext),
+ .priv_data_size = sizeof(MJPEGParserContext),
.parser_parse = jpeg_parse,
.parser_close = ff_parse_close,
};