librempeg/pktdumper.c

#include <avformat.h>
#include <limits.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define PKTFILESUFF "_%08Ld_%02d_%010Ld_%06d_%c.bin"

static int usage(int ret)
{
	fprintf(stderr, "dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
	fprintf(stderr, "each packet is dumped in its own file named like `basename file.ext`_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
	fprintf(stderr, "pktdumper file [maxpkts]\n");
	return ret;
}

int main(int argc, char **argv)
{
	char fntemplate[PATH_MAX];
	char pktfilename[PATH_MAX];
	AVFormatContext *fctx;
	AVPacket pkt;
	int64_t pktnum = 0;
	int64_t maxpkts = 0;
	int err;
	
	if (argc < 2)
		return usage(1);
	if (argc > 2)
		maxpkts = atoi(argv[2]);
	strncpy(fntemplate, argv[1], PATH_MAX-1);
	if (strrchr(argv[1], '/'))
		strncpy(fntemplate, strrchr(argv[1], '/')+1, PATH_MAX-1);
	if (strrchr(fntemplate, '.'))
		*strrchr(fntemplate, '.') = '\0';
	if (strchr(fntemplate, '%')) {
		fprintf(stderr, "can't use filenames containing '%%'\n");
		return usage(1);
	}
	if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= PATH_MAX-1) {
		fprintf(stderr, "filename too long\n");
		return usage(1);
	}
	strcat(fntemplate, PKTFILESUFF);
	printf("FNTEMPLATE: '%s'\n", fntemplate);
	
	// register all file formats
	av_register_all();
	
	err = av_open_input_file(&fctx, argv[1], NULL, 0, NULL);
	if (err < 0) {
		fprintf(stderr, "av_open_input_file: error %d\n", err);
		return 1;
	}
	
	err = av_find_stream_info(fctx);
	if (err < 0) {
		fprintf(stderr, "av_find_stream_info: error %d\n", err);
		return 1;
	}
	
	av_init_packet(&pkt);
	
	while ((err = av_read_frame(fctx, &pkt)) >= 0) {
		int fd;
		snprintf(pktfilename, PATH_MAX-1, fntemplate, pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & PKT_FLAG_KEY)?'K':'_');
		printf(PKTFILESUFF"\n", pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & PKT_FLAG_KEY)?'K':'_');
		//printf("open(\"%s\")\n", pktfilename);
		fd = open(pktfilename, O_WRONLY|O_CREAT, 0644);
		write(fd, pkt.data, pkt.size);
		close(fd);
		pktnum++;
		if (maxpkts && (pktnum >= maxpkts))
			break;
	}
	
	return 0;
}