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screencast: don't use the PipeWire event to trigger screencast

Browse source 
Using the on_process event of the PipeWire can create a race condition
when a previous started screencast hasn't finished before the next
event.
This commit is contained in:
columbarius 2022-03-03 00:25:42 +01:00
parent 699e6ecf77
commit 10a07f7e90
4 changed files with 21 additions and 48 deletions
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2
include/pipewire_screencast.h
View file

@ -6,8 +6,6 @@
#define XDPW_PWR_BUFFERS 4
#define XDPW_PWR_ALIGN 16
void xdpw_pwr_trigger_process(struct xdpw_screencast_instance *cast);
bool xdpw_pwr_is_driving(struct xdpw_screencast_instance *cast);
void xdpw_pwr_dequeue_buffer(struct xdpw_screencast_instance *cast);
void xdpw_pwr_enqueue_buffer(struct xdpw_screencast_instance *cast);
void pwr_update_stream_param(struct xdpw_screencast_instance *cast);

1
include/screencast_common.h
View file

@ -31,6 +31,7 @@ enum xdpw_chooser_types {
enum xdpw_frame_state {
XDPW_FRAME_STATE_NONE,
XDPW_FRAME_STATE_STARTED,
XDPW_FRAME_STATE_RENEG,
XDPW_FRAME_STATE_FAILED,
XDPW_FRAME_STATE_SUCCESS,

19
src/screencast/pipewire_screencast.c
View file

@ -44,14 +44,6 @@ static struct spa_pod *build_format(struct spa_pod_builder *b, enum spa_video_fo
return spa_pod_builder_pop(b, &f[0]);
}
static void pwr_handle_stream_process(void *data) {
struct xdpw_screencast_instance *cast = data;
logprint(TRACE, "pipewire: stream process");
xdpw_wlr_frame_start(cast);
}
static void pwr_handle_stream_state_changed(void *data,
enum pw_stream_state old, enum pw_stream_state state, const char *error) {
struct xdpw_screencast_instance *cast = data;
@ -64,7 +56,7 @@ static void pwr_handle_stream_state_changed(void *data,
switch (state) {
case PW_STREAM_STATE_STREAMING:
cast->pwr_stream_state = true;
if (!cast->wlr_frame) {
if (cast->frame_state == XDPW_FRAME_STATE_NONE) {
xdpw_wlr_frame_start(cast);
}
break;
@ -184,17 +176,8 @@ static const struct pw_stream_events pwr_stream_events = {
.param_changed = pwr_handle_stream_param_changed,
.add_buffer = pwr_handle_stream_add_buffer,
.remove_buffer = pwr_handle_stream_remove_buffer,
.process = pwr_handle_stream_process,
};
void xdpw_pwr_trigger_process(struct xdpw_screencast_instance *cast) {
pw_stream_trigger_process(cast->stream);
}
bool xdpw_pwr_is_driving(struct xdpw_screencast_instance *cast) {
return pw_stream_is_driving(cast->stream);
}
void xdpw_pwr_dequeue_buffer(struct xdpw_screencast_instance *cast) {
logprint(TRACE, "pipewire: dequeueing buffer");

47
src/screencast/wlr_screencast.c
View file

@ -32,7 +32,11 @@ void xdpw_wlr_frame_finish(struct xdpw_screencast_instance *cast) {
wlr_frame_free(cast);
if (!cast->pwr_stream_state) {
if (cast->quit || cast->err) {
// TODO: revisit the exit condition (remove quit?)
// and clean up sessions that still exist if err
// is the cause of the instance_destroy call
xdpw_screencast_instance_destroy(cast);
return;
}
@ -41,31 +45,24 @@ void xdpw_wlr_frame_finish(struct xdpw_screencast_instance *cast) {
xdpw_pwr_enqueue_buffer(cast);
}
if (!cast->pwr_stream_state) {
cast->frame_state = XDPW_FRAME_STATE_NONE;
return;
}
if (cast->frame_state == XDPW_FRAME_STATE_RENEG) {
pwr_update_stream_param(cast);
}
if (cast->quit || cast->err) {
// TODO: revisit the exit condition (remove quit?)
// and clean up sessions that still exist if err
// is the cause of the instance_destroy call
xdpw_screencast_instance_destroy(cast);
return ;
}
if (cast->pwr_stream_state && xdpw_pwr_is_driving(cast)) {
if (cast->frame_state == XDPW_FRAME_STATE_SUCCESS) {
uint64_t delay_ns = fps_limit_measure_end(&cast->fps_limit, cast->framerate);
if (delay_ns > 0) {
xdpw_add_timer(cast->ctx->state, delay_ns,
(xdpw_event_loop_timer_func_t) xdpw_pwr_trigger_process, cast);
} else {
xdpw_pwr_trigger_process(cast);
}
} else {
xdpw_pwr_trigger_process(cast);
if (cast->frame_state == XDPW_FRAME_STATE_SUCCESS) {
uint64_t delay_ns = fps_limit_measure_end(&cast->fps_limit, cast->framerate);
if (delay_ns > 0) {
xdpw_add_timer(cast->ctx->state, delay_ns,
(xdpw_event_loop_timer_func_t) xdpw_wlr_frame_start, cast);
return;
}
}
xdpw_wlr_frame_start(cast);
}
void xdpw_wlr_frame_start(struct xdpw_screencast_instance *cast) {
@ -73,7 +70,7 @@ void xdpw_wlr_frame_start(struct xdpw_screencast_instance *cast) {
if (cast->err) {
logprint(ERROR, "wlroots: nonrecoverable error has happened. shutting down instance");
xdpw_screencast_instance_destroy(cast);
return ;
return;
}
if (cast->pwr_stream_state) {
@ -81,11 +78,10 @@ void xdpw_wlr_frame_start(struct xdpw_screencast_instance *cast) {
if (!cast->current_frame.current_pw_buffer) {
logprint(WARN, "wlroots: failed to dequeue buffer");
// TODO: wait for next frame
}
}
cast->frame_state = XDPW_FRAME_STATE_NONE;
cast->frame_state = XDPW_FRAME_STATE_STARTED;
xdpw_wlr_register_cb(cast);
}
@ -121,11 +117,6 @@ static void wlr_frame_buffer_done(void *data,
struct xdpw_screencast_instance *cast = data;
logprint(TRACE, "wlroots: buffer_done event handler");
if (!cast->pwr_stream_state) {
xdpw_wlr_frame_finish(cast);
return;
}
if (!cast->current_frame.current_pw_buffer) {
logprint(WARN, "wlroots: no current buffer");
xdpw_wlr_frame_finish(cast);