scrcpy/app/src/fps_counter.c

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#include "fps_counter.h"
#include <SDL2/SDL_assert.h>
#include <SDL2/SDL_timer.h>
#include "lock_util.h"
#include "log.h"
#define FPS_COUNTER_INTERVAL_MS 1000
bool
fps_counter_init(struct fps_counter *counter) {
counter->mutex = SDL_CreateMutex();
if (!counter->mutex) {
return false;
}
counter->state_cond = SDL_CreateCond();
if (!counter->state_cond) {
SDL_DestroyMutex(counter->mutex);
return false;
}
counter->thread = NULL;
SDL_AtomicSet(&counter->started, 0);
// no need to initialize the other fields, they are unused until started
return true;
}
void
fps_counter_destroy(struct fps_counter *counter) {
SDL_DestroyCond(counter->state_cond);
SDL_DestroyMutex(counter->mutex);
}
// must be called with mutex locked
static void
display_fps(struct fps_counter *counter) {
unsigned rendered_per_second =
counter->nr_rendered * 1000 / FPS_COUNTER_INTERVAL_MS;
if (counter->nr_skipped) {
LOGI("%u fps (+%u frames skipped)", rendered_per_second,
counter->nr_skipped);
} else {
LOGI("%u fps", rendered_per_second);
}
}
// must be called with mutex locked
static void
check_interval_expired(struct fps_counter *counter, uint32_t now) {
if (now < counter->next_timestamp) {
return;
}
display_fps(counter);
counter->nr_rendered = 0;
counter->nr_skipped = 0;
// add a multiple of the interval
uint32_t elapsed_slices =
(now - counter->next_timestamp) / FPS_COUNTER_INTERVAL_MS + 1;
counter->next_timestamp += FPS_COUNTER_INTERVAL_MS * elapsed_slices;
}
static int
run_fps_counter(void *data) {
struct fps_counter *counter = data;
mutex_lock(counter->mutex);
while (!counter->interrupted) {
while (!counter->interrupted && !SDL_AtomicGet(&counter->started)) {
cond_wait(counter->state_cond, counter->mutex);
}
while (!counter->interrupted && SDL_AtomicGet(&counter->started)) {
uint32_t now = SDL_GetTicks();
check_interval_expired(counter, now);
SDL_assert(counter->next_timestamp > now);
uint32_t remaining = counter->next_timestamp - now;
// ignore the reason (timeout or signaled), we just loop anyway
cond_wait_timeout(counter->state_cond, counter->mutex, remaining);
}
}
mutex_unlock(counter->mutex);
return 0;
}
bool
fps_counter_start(struct fps_counter *counter) {
mutex_lock(counter->mutex);
counter->next_timestamp = SDL_GetTicks() + FPS_COUNTER_INTERVAL_MS;
counter->nr_rendered = 0;
counter->nr_skipped = 0;
mutex_unlock(counter->mutex);
SDL_AtomicSet(&counter->started, 1);
cond_signal(counter->state_cond);
// counter->thread is always accessed from the same thread, no need to lock
if (!counter->thread) {
counter->thread =
SDL_CreateThread(run_fps_counter, "fps counter", counter);
if (!counter->thread) {
LOGE("Could not start FPS counter thread");
return false;
}
}
return true;
}
void
fps_counter_stop(struct fps_counter *counter) {
SDL_AtomicSet(&counter->started, 0);
cond_signal(counter->state_cond);
}
bool
fps_counter_is_started(struct fps_counter *counter) {
return SDL_AtomicGet(&counter->started);
}
void
fps_counter_interrupt(struct fps_counter *counter) {
if (!counter->thread) {
return;
}
mutex_lock(counter->mutex);
counter->interrupted = true;
mutex_unlock(counter->mutex);
// wake up blocking wait
cond_signal(counter->state_cond);
}
void
fps_counter_join(struct fps_counter *counter) {
if (counter->thread) {
SDL_WaitThread(counter->thread, NULL);
}
}
void
fps_counter_add_rendered_frame(struct fps_counter *counter) {
if (!SDL_AtomicGet(&counter->started)) {
return;
}
mutex_lock(counter->mutex);
uint32_t now = SDL_GetTicks();
check_interval_expired(counter, now);
++counter->nr_rendered;
mutex_unlock(counter->mutex);
}
void
fps_counter_add_skipped_frame(struct fps_counter *counter) {
if (!SDL_AtomicGet(&counter->started)) {
return;
}
mutex_lock(counter->mutex);
uint32_t now = SDL_GetTicks();
check_interval_expired(counter, now);
++counter->nr_skipped;
mutex_unlock(counter->mutex);
}