pktdumper debugging utility for demuxers. This tool dumps each AVPacket demuxed to a stamped file.

make pktdumper LDFLAGS='-Llibavformat/ -lavformat'

Originally committed as revision 4044 to svn://svn.ffmpeg.org/ffmpeg/trunk

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;
+}