/*
* MPEG4 Video frame extraction
- * Copyright (c) 2003 Fabrice Bellard.
- * Copyright (c) 2003 Michael Niedermayer.
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003 Michael Niedermayer
*
* This file is part of FFmpeg.
*
#include "parser.h"
#include "mpegvideo.h"
+#include "mpeg4video_parser.h"
+int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
+ int vop_found, i;
+ uint32_t state;
+
+ vop_found= pc->frame_start_found;
+ state= pc->state;
+
+ i=0;
+ if(!vop_found){
+ for(i=0; i<buf_size; i++){
+ state= (state<<8) | buf[i];
+ if(state == 0x1B6){
+ i++;
+ vop_found=1;
+ break;
+ }
+ }
+ }
+
+ if(vop_found){
+ /* EOF considered as end of frame */
+ if (buf_size == 0)
+ return 0;
+ for(; i<buf_size; i++){
+ state= (state<<8) | buf[i];
+ if((state&0xFFFFFF00) == 0x100){
+ pc->frame_start_found=0;
+ pc->state=-1;
+ return i-3;
+ }
+ }
+ }
+ pc->frame_start_found= vop_found;
+ pc->state= state;
+ return END_NOT_FOUND;
+}
+
/* XXX: make it use less memory */
static int av_mpeg4_decode_header(AVCodecParserContext *s1,
AVCodecContext *avctx,
init_get_bits(gb, buf, 8 * buf_size);
ret = ff_mpeg4_decode_picture_header(s, gb);
- if (s->width) {
+ if (s->width && (!avctx->width || !avctx->height || !avctx->coded_width || !avctx->coded_height)) {
avcodec_set_dimensions(avctx, s->width, s->height);
}
s1->pict_type= s->pict_type;
return ret;
}
-static int mpeg4video_parse_init(AVCodecParserContext *s)
+static av_cold int mpeg4video_parse_init(AVCodecParserContext *s)
{
ParseContext1 *pc = s->priv_data;