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audio/flacdec: throw out decoded audio until finished seeking

--- a/sys/src/cmd/audio/flacdec/flacdec.c

+++ b/sys/src/cmd/audio/flacdec/flacdec.c

@@ -10,6 +10,7 @@

 static int ifd = 1;

 static int pid = -1;

 static int sts;

+static int silence;

 static void

 flushout(void)

@@ -147,7 +148,7 @@

 		}

 	}

 	n = b * chans * len;

-	if(n > 0 && write(ifd, buf, n) != n)

+	if(!silence && n > 0 && write(ifd, buf, n) != n)

 		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;

 	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;

@@ -192,6 +193,7 @@

 	FLAC__stream_decoder_init_stream(dec, decinput, decseek, dectell, declen, checkeof, decoutput, NULL, decerror, NULL);

 	if(seek > 0.0){

 		FLAC__uint64 srate;

+		silence = 1;

 		do{

 			if(!FLAC__stream_decoder_process_single(dec))

 				break;

@@ -201,6 +203,7 @@

 			FLAC__stream_decoder_flush(dec);

 			seek = 0.0;

 		}

+		silence = 0;

 		fprintf(stderr, "time: %g\n", seek);

 	}

 	FLAC__stream_decoder_process_until_end_of_stream(dec);