decoder/flac: remove obsolete sub-song support

src/decoder/plugins/FlacCommon.cxx

@@ -33,7 +33,7 @@ flac_data::flac_data(Decoder &_decoder,
 		     InputStream &_input_stream)
 	:FlacInput(_input_stream, &_decoder),
 	 initialized(false), unsupported(false),
-	 total_frames(0), first_frame(0), next_frame(0), position(0),
+	 total_frames(0), position(0),
 	 decoder(_decoder), input_stream(_input_stream)
 {
 }
@@ -176,7 +176,6 @@ flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
 	auto cmd = decoder_data(data->decoder, data->input_stream,
 				buffer, buffer_size,
 				bit_rate);
-	data->next_frame += frame->header.blocksize;
 	switch (cmd) {
 	case DecoderCommand::NONE:
 	case DecoderCommand::START:

src/decoder/plugins/FlacCommon.hxx

@@ -61,17 +61,6 @@ struct flac_data : public FlacInput {
 	 */
 	FLAC__uint64 total_frames;
 
-	/**
-	 * The number of the first frame in this song.  This is only
-	 * non-zero if playing sub songs from a CUE sheet.
-	 */
-	FLAC__uint64 first_frame;
-
-	/**
-	 * The number of the next frame which is going to be decoded.
-	 */
-	FLAC__uint64 next_frame;
-
 	FLAC__uint64 position;
 
 	Decoder &decoder;

src/decoder/plugins/FlacDecoderPlugin.cxx

@@ -167,13 +167,10 @@ flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
 }
 
 static void
-flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
-		  FLAC__uint64 t_start, FLAC__uint64 t_end)
+flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec)
 {
 	Decoder &decoder = data->decoder;
 
-	data->first_frame = t_start;
-
 	while (true) {
 		DecoderCommand cmd;
 		if (!data->tag.IsEmpty()) {
@@ -184,12 +181,9 @@ flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
 			cmd = decoder_get_command(decoder);
 
 		if (cmd == DecoderCommand::SEEK) {
-			FLAC__uint64 seek_sample = t_start +
+			FLAC__uint64 seek_sample =
 				decoder_seek_where_frame(decoder);
-			if (seek_sample >= t_start &&
-			    (t_end == 0 || seek_sample <= t_end) &&
-			    FLAC__stream_decoder_seek_absolute(flac_dec, seek_sample)) {
-				data->next_frame = seek_sample;
+			if (FLAC__stream_decoder_seek_absolute(flac_dec, seek_sample)) {
 				data->position = 0;
 				decoder_command_finished(decoder);
 			} else
@@ -230,10 +224,6 @@ flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
 			return;
 		}
 
-		if (t_end != 0 && data->next_frame >= t_end)
-			/* end of this sub track */
-			break;
-
 		if (!FLAC__stream_decoder_process_single(flac_dec) &&
 		    decoder_get_command(decoder) == DecoderCommand::NONE) {
 			/* a failure that was not triggered by a
@@ -310,7 +300,7 @@ flac_decode_internal(Decoder &decoder,
 		return;
 	}
 
-	flac_decoder_loop(&data, flac_dec, 0, 0);
+	flac_decoder_loop(&data, flac_dec);
 
 	FLAC__stream_decoder_finish(flac_dec);
 	FLAC__stream_decoder_delete(flac_dec);