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authorEric Wong <normalperson@yhbt.net>2008-04-14 06:41:05 +0000
committerEric Wong <normalperson@yhbt.net>2008-04-14 06:41:05 +0000
commitb44506084e3da47e4cece0ba1fec84057332a2be (patch)
tree6cceaaf2e36d8d548e3086853f9775b0bab1b87a /src/decode.c
parent93fee6fc852305c6553410a8696b6e01f0ba3978 (diff)
downloadmpd-b44506084e3da47e4cece0ba1fec84057332a2be.tar.gz
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decode.c: make the crossfade state variable self-documenting
git-svn-id: https://svn.musicpd.org/mpd/trunk@7358 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to 'src/decode.c')
-rw-r--r--src/decode.c33
1 files changed, 18 insertions, 15 deletions
diff --git a/src/decode.c b/src/decode.c
index a5110f752..5016a173d 100644
--- a/src/decode.c
+++ b/src/decode.c
@@ -26,6 +26,12 @@
#include "ls.h"
#include "main_notify.h"
+enum xfade_state {
+ XFADE_DISABLED = 1,
+ XFADE_UNKNOWN = 0,
+ XFADE_ENABLED = 1
+};
+
/* called inside decoder_task (inputPlugins) */
void decoder_wakeup_player(void)
{
@@ -149,7 +155,7 @@ static int decodeSeek(int *decodeWaitedOn, int *next)
}
static void processDecodeInput(int *pause_r, unsigned int *bbp_r,
- int *doCrossFade_r,
+ enum xfade_state *do_xfade_r,
int *decodeWaitedOn_r,
int *next_r)
{
@@ -192,7 +198,7 @@ static void processDecodeInput(int *pause_r, unsigned int *bbp_r,
if(pc.seek) {
dropBufferedAudio();
if (decodeSeek(decodeWaitedOn_r, next_r) == 0) {
- *doCrossFade_r = 0;
+ *do_xfade_r = XFADE_UNKNOWN;
*bbp_r = 0;
}
}
@@ -383,9 +389,7 @@ static void decodeParent(void)
int do_pause = 0;
int buffering = 1;
unsigned int bbp = buffered_before_play;
- /** cross fading enabled for the current song? 0=must check;
- 1=enabled; -1=disabled */
- int doCrossFade = 0;
+ enum xfade_state do_xfade = XFADE_UNKNOWN;
unsigned int crossFadeChunks = 0;
/** the position of the next cross-faded chunk in the next
song */
@@ -405,7 +409,7 @@ static void decodeParent(void)
wakeup_main_task();
while (1) {
- processDecodeInput(&do_pause, &bbp, &doCrossFade,
+ processDecodeInput(&do_pause, &bbp, &do_xfade,
&decodeWaitedOn, &next);
if (pc.stop) {
dropBufferedAudio();
@@ -473,7 +477,7 @@ static void decodeParent(void)
wakeup_main_task();
player_wakeup_decoder_nb();
}
- if (next >= 0 && doCrossFade == 0 && !dc.start &&
+ if (next >= 0 && do_xfade == XFADE_UNKNOWN && !dc.start &&
dc.state != DECODE_STATE_START) {
/* enable cross fading in this song? if yes,
calculate how many chunks will be required
@@ -482,21 +486,20 @@ static void decodeParent(void)
calculateCrossFadeChunks(&(ob.audioFormat),
dc.totalTime);
if (crossFadeChunks > 0) {
- doCrossFade = 1;
+ do_xfade = XFADE_ENABLED;
nextChunk = -1;
} else
/* cross fading is disabled or the
next song is too short */
- doCrossFade = -1;
+ do_xfade = XFADE_DISABLED;
}
if (do_pause)
player_sleep();
else if (!ob_is_empty() && (int)ob.begin != next) {
- ob_chunk *beginChunk =
- ob_get_chunk(ob.begin);
+ ob_chunk *beginChunk = ob_get_chunk(ob.begin);
unsigned int fadePosition;
- if (doCrossFade == 1 && next >= 0 &&
+ if (do_xfade == XFADE_ENABLED && next >= 0 &&
(fadePosition = ob_relative(next))
<= crossFadeChunks) {
/* perform cross fade */
@@ -522,7 +525,7 @@ static void decodeParent(void)
/* the decoder isn't
running, abort
cross fading */
- doCrossFade = -1;
+ do_xfade = XFADE_DISABLED;
} else {
/* wait for the
decoder */
@@ -541,14 +544,14 @@ static void decodeParent(void)
} else if (!ob_is_empty() && (int)ob.begin == next) {
/* at the beginning of a new song */
- if (doCrossFade == 1 && nextChunk >= 0) {
+ if (do_xfade == XFADE_ENABLED && nextChunk >= 0) {
/* the cross-fade is finished; skip
the section which was cross-faded
(and thus already played) */
ob_skip(crossFadeChunks);
}
- doCrossFade = 0;
+ do_xfade = XFADE_UNKNOWN;
/* wait for the decoder to work on the new song */
if (pc.queueState == PLAYER_QUEUE_DECODE ||