try to make seeking more non-blocking

src/aac_decode.c

@@ -341,13 +341,12 @@ int aac_decode(OutputBuffer * cb, DecoderControl * dc) {
 		sampleRate = frameInfo.samplerate;
 #endif
 
-		if(dc->start) {
+		if(dc->state != DECODE_STATE_DECODE) {
 			dc->audioFormat.channels = frameInfo.channels;
 			dc->audioFormat.sampleRate = sampleRate;
                         getOutputAudioFormat(&(dc->audioFormat),
                                         &(cb->audioFormat));
 			dc->state = DECODE_STATE_DECODE;
-			dc->start = 0;
 		}
 
 		advanceAacBuffer(&b,frameInfo.bytesconsumed);
@@ -382,7 +381,7 @@ int aac_decode(OutputBuffer * cb, DecoderControl * dc) {
 	closeInputStream(b.inStream);
 	if(b.buffer) free(b.buffer);
 
-	if(dc->start) return -1;
+	if(dc->state != DECODE_STATE_DECODE) return -1;
 
 	if(!dc->stop && !dc->seek && chunkLen>0) {
 		cb->chunkSize[cb->end] = chunkLen;

src/audiofile_decode.c

@@ -91,7 +91,6 @@ int audiofile_decode(OutputBuffer * cb, DecoderControl * dc) {
 	fs = (int)afGetFrameSize(af_fp, AF_DEFAULT_TRACK,1);
 
 	dc->state = DECODE_STATE_DECODE;
-	dc->start = 0;
 	{
 		int ret, eof = 0, current = 0;
 		unsigned char chunk[CHUNK_SIZE];

src/decode.h

@@ -31,7 +31,8 @@
 #define DECODE_TYPE_URL		1
 
 #define DECODE_STATE_STOP	0
-#define DECODE_STATE_DECODE	1
+#define DECODE_STATE_START      1
+#define DECODE_STATE_DECODE	2
 
 #define DECODE_ERROR_NOERROR	0
 #define DECODE_ERROR_UNKTYPE	10

src/flac_decode.c

@@ -135,7 +135,6 @@ int flac_decode(OutputBuffer * cb, DecoderControl *dc) {
 	}
 
 	dc->state = DECODE_STATE_DECODE;
-	dc->start = 0;
 
 	while(1) {
 		FLAC__seekable_stream_decoder_process_single(flacDec);

src/mp3_decode.c

@@ -560,7 +560,6 @@ int mp3_decode(OutputBuffer * cb, DecoderControl * dc, InputStream * inStream) {
         getOutputAudioFormat(&(dc->audioFormat), &(cb->audioFormat));
         
 	dc->totalTime = data.totalTime;
-	dc->start = 0;
 	dc->state = DECODE_STATE_DECODE;
 
 	while(mp3Read(&data,cb,dc)!=DECODE_BREAK);

src/mp4_decode.c

@@ -249,7 +249,7 @@ int mp4_decode(OutputBuffer * cb, DecoderControl * dc) {
 			break;
 		}
 
-		if(dc->start) {
+		if(dc->state != DECODE_STATE_DECODE) {
 			channels = frameInfo.channels;
 #ifdef HAVE_FAACDECFRAMEINFO_SAMPLERATE
 			scale = frameInfo.samplerate;
@@ -259,7 +259,6 @@ int mp4_decode(OutputBuffer * cb, DecoderControl * dc) {
                         getOutputAudioFormat(&(dc->audioFormat),
                                         &(cb->audioFormat));
 			dc->state = DECODE_STATE_DECODE;
-			dc->start = 0;
 		}
 
 		if(channels*(dur+offset) > frameInfo.samples) {
@@ -297,7 +296,7 @@ int mp4_decode(OutputBuffer * cb, DecoderControl * dc) {
 	closeInputStream(&inStream);
 	free(mp4cb);
 
-	if(dc->start) return -1;
+	if(dc->state != DECODE_STATE_DECODE) return -1;
 
 	if(!dc->stop && !dc->seek && chunkLen>0) {
 		cb->chunkSize[cb->end] = chunkLen;

src/ogg_decode.c

@@ -175,7 +175,6 @@ int ogg_decode(OutputBuffer * cb, DecoderControl * dc)
 
 	dc->totalTime = ov_time_total(&vf,-1);
 	dc->state = DECODE_STATE_DECODE;
-	dc->start = 0;
 
 	{
 		int current_section;