#define MAX_VIDEO_PACKET_SIZE (224*1024+4)
#define VIDEOBUFFER_SIZE 0x100000

extern unsigned char* videobuffer;
extern int videobuf_len;
extern unsigned char videobuf_code[4];
extern int videobuf_code_len;

// sync video stream, and returns next packet code
int sync_video_packet(demux_stream_t *ds);

// return: packet length
int read_video_packet(demux_stream_t *ds);

// return: next packet code
int skip_video_packet(demux_stream_t *ds);