hvirtual/libmpeg3/mpeg3peek.c

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#include "libmpeg3.h"
#include <stdlib.h>




int main(int argc, char *argv[])
{
        mpeg3_t *file;
        if(argc < 3)
        {
                printf("Usage: mpeg3peek <table of contents> <frame number>\n");
                printf("Print the byte offset of a given frame.\n");
                printf("Only works for video.  Requires table of contents.\n");
                printf("Example: mpeg3peek heroine.toc 123\n");
                exit(1);
        }

        int error = 0;
        file = mpeg3_open(argv[1], &error);
        if(file)
        {
                if(!mpeg3_total_vstreams(file))
                {
                        printf("Need a video stream.\n");
                        exit(1);
                }

                if(!file->vtrack[0]->total_frame_offsets)
                {
                        printf("Zero length track.  Did you load a table of contents?\n");
                        exit(1);
                }

                int frame_number = atoi(argv[2]);
                if(frame_number < 0) frame_number = 0;
                if(frame_number > file->vtrack[0]->total_frame_offsets)
                        frame_number = file->vtrack[0]->total_frame_offsets - 1;
                printf("frame=%d offset=0x%llx\n", 
                        frame_number,
                        file->vtrack[0]->frame_offsets[frame_number]);
        }
}

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