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context: implement dynamic rate

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Add a default.clock.allowed-rates property that lists the possible
rates for the graph.

Add node.rate and node.lock-rate properties to suggest a graph rate
and lock the rate.

Collect the largest clock rate from the nodes and if it is allowed,
try to configure it as the graph rate. Only switch rates when the
driver is IDLE or suspended or when we force a rate.

No alternative samplerates are specified because we first need to
work around a common driver bug (cards with 1 cristal need the same
rate for capture as playback) for this to work.
This commit is contained in:
Wim Taymans 2021-07-30 16:15:34 +02:00
parent 8375d7b2d7
commit 1ff208875c
5 changed files with 144 additions and 35 deletions
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17
src/pipewire/private.h
View file

@ -49,15 +49,18 @@ struct ucred {
#define spa_debug(...) pw_log_trace(__VA_ARGS__)
#endif
#define MAX_RATES 16u
#define CLOCK_MIN_QUANTUM 4u
#define CLOCK_MAX_QUANTUM 8192u
struct settings {
uint32_t log_level;
uint32_t clock_rate;
uint32_t clock_quantum;
uint32_t clock_min_quantum;
uint32_t clock_max_quantum;
uint32_t clock_rate; /* default clock rate */
uint32_t clock_rates[MAX_RATES]; /* allowed clock rates */
uint32_t n_clock_rates; /* number of alternative clock rates */
uint32_t clock_quantum; /* default quantum */
uint32_t clock_min_quantum; /* min quantum */
uint32_t clock_max_quantum; /* max quantum */
struct spa_rectangle video_size;
struct spa_fraction video_rate;
uint32_t link_max_buffers;
@ -67,8 +70,8 @@ struct settings {
#define CLOCK_RATE_UPDATE_MODE_HARD 0
#define CLOCK_RATE_UPDATE_MODE_SOFT 1
int clock_rate_update_mode;
uint32_t clock_force_rate;
uint32_t clock_force_quantum;
uint32_t clock_force_rate; /* force a clock rate */
uint32_t clock_force_quantum; /* force a quantum */
};
struct ratelimit {
@ -678,6 +681,7 @@ struct pw_impl_node {
unsigned int loopchecked:1; /**< for feedback loop checking */
unsigned int always_process:1; /**< this node wants to always be processing, even when idle */
unsigned int lock_quantum:1; /**< don't change graph quantum */
unsigned int lock_rate:1; /**< don't change graph rate */
uint32_t port_user_data_size; /**< extra size for port user data */
@ -702,6 +706,7 @@ struct pw_impl_node {
struct spa_fraction latency; /**< requested latency */
struct spa_fraction max_latency; /**< maximum latency */
struct spa_fraction rate; /**< requested rate */
struct spa_source source; /**< source to remotely trigger this node */
struct pw_memblock *activation;
struct {