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alsa: Implement period-based wakeups

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Provides configuration to disable timer-based scheduling. This can be
useful at low latencies, for example, where period-based interrupts
might be more reliable than timers.
This commit is contained in:
Arun Raghavan 2023-02-28 13:55:04 -05:00 • committed by Wim Taymans
parent f28c30d526
commit 26e37b6575
2 changed files with 159 additions and 31 deletions
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7
spa/plugins/alsa/alsa-pcm.h
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@ -47,6 +47,7 @@ struct props {
};
#define MAX_BUFFERS 32
#define MAX_POLL 16
struct buffer {
uint32_t id;
@ -131,6 +132,7 @@ struct state {
struct channel_map default_pos;
unsigned int disable_mmap;
unsigned int disable_batch;
unsigned int disable_tsched;
char clock_name[64];
uint32_t quantum_limit;
@ -171,8 +173,11 @@ struct state {
size_t ready_offset;
bool started;
struct spa_source source;
/* Either a single source for tsched, or a set of pollfds from ALSA */
struct spa_source source[MAX_POLL];
int timerfd;
struct pollfd pfds[MAX_POLL];
int n_fds;
uint32_t threshold;
uint32_t last_threshold;
uint32_t headroom;