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when an underrun happens, increase watermark by 10ms instead of doubling it

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This commit is contained in:
Lennart Poettering 2009-02-27 01:15:06 +01:00
parent 0d8f67b826
commit 1c86267e1f
2 changed files with 39 additions and 10 deletions
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28
src/modules/alsa/alsa-sink.c
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@ -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;