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implement device reservation scheme

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This commit is contained in:
Lennart Poettering 2009-02-24 06:13:39 +01:00
parent 3c73025bf5
commit c341010304
10 changed files with 1102 additions and 2 deletions
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81
src/modules/alsa/alsa-source.c
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@ -54,6 +54,8 @@
#include <pulsecore/time-smoother.h>
#include <pulsecore/rtclock.h>
#include <modules/reserve-wrap.h>
#include "alsa-util.h"
#include "alsa-source.h"
@ -99,10 +101,62 @@ struct userdata {
pa_smoother *smoother;
uint64_t read_count;
pa_reserve_wrapper *reserve;
pa_hook_slot *reserve_slot;
};
static void userdata_free(struct userdata *u);
static pa_hook_result_t reserve_cb(pa_reserve_wrapper *r, void *forced, struct userdata *u) {
pa_assert(r);
pa_assert(u);
if (pa_source_suspend(u->source, TRUE) < 0)
return PA_HOOK_CANCEL;
return PA_HOOK_OK;
}
static void reserve_done(struct userdata *u) {
pa_assert(u);
if (u->reserve_slot) {
pa_hook_slot_free(u->reserve_slot);
u->reserve_slot = NULL;
}
if (u->reserve) {
pa_reserve_wrapper_unref(u->reserve);
u->reserve = NULL;
}
}
static int reserve_init(struct userdata *u, const char *dname) {
char *rname;
pa_assert(u);
pa_assert(dname);
if (u->reserve)
return 0;
/* We are resuming, try to lock the device */
if (!(rname = pa_alsa_get_reserve_name(dname)))
return 0;
u->reserve = pa_reserve_wrapper_get(u->core, rname);
pa_xfree(rname);
if (!(u->reserve))
return -1;
pa_assert(!u->reserve_slot);
u->reserve_slot = pa_hook_connect(pa_reserve_wrapper_hook(u->reserve), PA_HOOK_NORMAL, (pa_hook_cb_t) reserve_cb, u);
return 0;
}
static void fix_min_sleep_wakeup(struct userdata *u) {
size_t max_use, max_use_2;
pa_assert(u);
@ -765,6 +819,25 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
return pa_source_process_msg(o, code, data, offset, chunk);
}
/* Called from main context */
static int source_set_state_cb(pa_source *s, pa_source_state_t new_state) {
pa_source_state_t old_state;
struct userdata *u;
pa_source_assert_ref(s);
pa_assert_se(u = s->userdata);
old_state = pa_source_get_state(u->source);
if (PA_SINK_IS_OPENED(old_state) && new_state == PA_SINK_SUSPENDED)
reserve_done(u);
else if (old_state == PA_SINK_SUSPENDED && PA_SINK_IS_OPENED(new_state))
if (reserve_init(u, u->device_name) < 0)
return -1;
return 0;
}
static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
struct userdata *u = snd_mixer_elem_get_callback_private(elem);
@ -1316,6 +1389,11 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
u->smoother = pa_smoother_new(DEFAULT_TSCHED_WATERMARK_USEC*2, DEFAULT_TSCHED_WATERMARK_USEC*2, TRUE, 5);
pa_smoother_set_time_offset(u->smoother, pa_rtclock_usec());
if (reserve_init(u, pa_modargs_get_value(
ma, "device_id",
pa_modargs_get_value(ma, "device", DEFAULT_DEVICE))) < 0)
goto fail;
b = use_mmap;
d = use_tsched;
@ -1414,6 +1492,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
u->source->parent.process_msg = source_process_msg;
u->source->update_requested_latency = source_update_requested_latency_cb;
u->source->set_state = source_set_state_cb;
u->source->userdata = u;
pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
@ -1519,6 +1598,8 @@ static void userdata_free(struct userdata *u) {
if (u->smoother)
pa_smoother_free(u->smoother);
reserve_done(u);
pa_xfree(u->device_name);
pa_xfree(u);
}