decoder/flac: calculate time stamp from current frame

Don't update a float timestamp, this will make imprecisions add up
after a while.  We already have the number of the current frame, let's
just calculate the float timestamp from that for every decoder_data()
command.  For this, we need to add the attribute "first_frame", for
CUE sheet songs.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/decoder/_flac_common.h b/src/decoder/_flac_common.h
index aa17c55ae..84b66285f 100644
--- a/src/decoder/_flac_common.h
+++ b/src/decoder/_flac_common.h
@@ -52,11 +52,16 @@ struct flac_data {
 	FLAC__StreamMetadata_StreamInfo stream_info;
 
 	/**
+	 * 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;
 
-	float time;
 	struct audio_format audio_format;
 	FLAC__uint64 position;
 	struct decoder *decoder;