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authorLennart Poettering <lennart@poettering.net>2009-02-27 01:15:06 +0100
committerLennart Poettering <lennart@poettering.net>2009-02-27 01:15:06 +0100
commit1c86267e1fabd2f6eb7349bfd47e4556dd779edf (patch)
tree94f38ffcdf01577a2d3b6e1a8451d9d130a0c463 /src/modules/alsa/alsa-sink.c
parent0d8f67b8269a60ce81b107cf7d1b79292b64e55b (diff)
when an underrun happens, increase watermark by 10ms instead of doubling it
Diffstat (limited to 'src/modules/alsa/alsa-sink.c')
-rw-r--r--src/modules/alsa/alsa-sink.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index dbd95b63..a33dad4d 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -61,10 +61,11 @@
/* #define DEBUG_TIMING */
#define DEFAULT_DEVICE "default"
-#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC) /* 2s */
-#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC) /* 20ms */
-#define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC) /* 10ms */
-#define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC) /* 4ms */
+#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC) /* 2s -- Overall buffer size */
+#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC) /* 20ms -- Fill up when only this much is left in the buffer */
+#define TSCHED_WATERMARK_STEP_USEC (10*PA_USEC_PER_MSEC) /* 10ms -- On underrun, increase watermark by this */
+#define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC) /* 10ms -- Sleep at least 10ms on each iteration */
+#define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC) /* 4ms -- Wakeup at least this long before the buffer runs empty*/
struct userdata {
pa_core *core;
@@ -86,7 +87,16 @@ struct userdata {
pa_bool_t mixer_seperate_channels:1;
pa_cvolume hardware_volume;
- size_t frame_size, fragment_size, hwbuf_size, tsched_watermark, hwbuf_unused, min_sleep, min_wakeup;
+ size_t
+ frame_size,
+ fragment_size,
+ hwbuf_size,
+ tsched_watermark,
+ hwbuf_unused,
+ min_sleep,
+ min_wakeup,
+ watermark_step;
+
unsigned nfragments;
pa_memchunk memchunk;
@@ -205,10 +215,11 @@ static void adjust_after_underrun(struct userdata *u) {
pa_usec_t old_min_latency, new_min_latency;
pa_assert(u);
+ pa_assert(u->use_tsched);
/* First, just try to increase the watermark */
old_watermark = u->tsched_watermark;
- u->tsched_watermark *= 2;
+ u->tsched_watermark = PA_MIN(u->tsched_watermark * 2, u->tsched_watermark + u->watermark_step);
fix_tsched_watermark(u);
if (old_watermark != u->tsched_watermark) {
@@ -219,7 +230,8 @@ static void adjust_after_underrun(struct userdata *u) {
/* Hmm, we cannot increase the watermark any further, hence let's raise the latency */
old_min_latency = u->sink->thread_info.min_latency;
- new_min_latency = PA_MIN(old_min_latency * 2, u->sink->thread_info.max_latency);
+ new_min_latency = PA_MIN(old_min_latency * 2, old_min_latency + TSCHED_WATERMARK_STEP_USEC);
+ new_min_latency = PA_MIN(new_min_latency, u->sink->thread_info.max_latency);
if (old_min_latency != new_min_latency) {
pa_log_notice("Increasing minimal latency to %0.2f ms",
@@ -1680,6 +1692,8 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
if (use_tsched) {
fix_min_sleep_wakeup(u);
fix_tsched_watermark(u);
+
+ u->watermark_step = pa_usec_to_bytes(TSCHED_WATERMARK_STEP_USEC, &u->sink->sample_spec);
}
u->sink->thread_info.max_rewind = use_tsched ? u->hwbuf_size : 0;