gstreamer/subprojects/gst-plugins-bad/sys/winks/gstksclock.c

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/*
* Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "gstksclock.h"
#include "kshelpers.h"
GST_DEBUG_CATEGORY_EXTERN (gst_ks_debug);
#define GST_CAT_DEFAULT gst_ks_debug
struct _GstKsClockPrivate
{
GMutex mutex;
GCond client_cond;
GCond worker_cond;
HANDLE clock_handle;
gboolean open;
gboolean closing;
KSSTATE state;
GThread *worker_thread;
gboolean worker_running;
gboolean worker_initialized;
GstClock *master_clock;
};
#define GST_KS_CLOCK_GET_PRIVATE(o) ((o)->priv)
#define GST_KS_CLOCK_LOCK() g_mutex_lock (&priv->mutex)
#define GST_KS_CLOCK_UNLOCK() g_mutex_unlock (&priv->mutex)
static void gst_ks_clock_dispose (GObject * object);
static void gst_ks_clock_finalize (GObject * object);
G_DEFINE_TYPE_WITH_PRIVATE (GstKsClock, gst_ks_clock, G_TYPE_OBJECT);
static GstKsClockClass *parent_class = NULL;
static void
gst_ks_clock_class_init (GstKsClockClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gobject_class->dispose = gst_ks_clock_dispose;
gobject_class->finalize = gst_ks_clock_finalize;
}
static void
gst_ks_clock_init (GstKsClock * self)
{
GstKsClockPrivate *priv;
self->priv = gst_ks_clock_get_instance_private (self);
priv = GST_KS_CLOCK_GET_PRIVATE (self);
g_mutex_init (&priv->mutex);
g_cond_init (&priv->client_cond);
g_cond_init (&priv->worker_cond);
priv->clock_handle = INVALID_HANDLE_VALUE;
priv->open = FALSE;
priv->closing = FALSE;
priv->state = KSSTATE_STOP;
priv->worker_thread = NULL;
priv->worker_running = FALSE;
priv->worker_initialized = FALSE;
priv->master_clock = NULL;
}
static void
gst_ks_clock_dispose (GObject * object)
{
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g_assert (!GST_KS_CLOCK_GET_PRIVATE (GST_KS_CLOCK (object))->open);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_ks_clock_finalize (GObject * object)
{
GstKsClock *self = GST_KS_CLOCK (object);
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
g_cond_clear (&priv->worker_cond);
g_cond_clear (&priv->client_cond);
g_mutex_clear (&priv->mutex);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void gst_ks_clock_close_unlocked (GstKsClock * self);
gboolean
gst_ks_clock_open (GstKsClock * self)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
GList *devices;
KsDeviceEntry *device;
KSSTATE state;
GST_KS_CLOCK_LOCK ();
g_assert (!priv->open);
priv->state = KSSTATE_STOP;
devices = ks_enumerate_devices (&KSCATEGORY_CLOCK, &KSCATEGORY_CAPTURE);
if (devices == NULL)
goto error;
device = devices->data;
priv->clock_handle = CreateFile (device->path, GENERIC_READ | GENERIC_WRITE,
0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL);
if (!ks_is_valid_handle (priv->clock_handle))
goto error;
state = KSSTATE_STOP;
if (!ks_object_set_property (priv->clock_handle, KSPROPSETID_Clock,
KSPROPERTY_CLOCK_STATE, &state, sizeof (state), NULL))
goto error;
ks_device_list_free (devices);
priv->open = TRUE;
GST_KS_CLOCK_UNLOCK ();
return TRUE;
error:
ks_device_list_free (devices);
gst_ks_clock_close_unlocked (self);
GST_KS_CLOCK_UNLOCK ();
return FALSE;
}
static gboolean
gst_ks_clock_set_state_unlocked (GstKsClock * self, KSSTATE state)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
KSSTATE initial_state;
gint addend;
g_assert (priv->open);
if (state == priv->state)
return TRUE;
initial_state = priv->state;
addend = (state > priv->state) ? 1 : -1;
GST_DEBUG ("Initiating clock state change from %s to %s",
ks_state_to_string (priv->state), ks_state_to_string (state));
while (priv->state != state) {
KSSTATE next_state = priv->state + addend;
GST_DEBUG ("Changing clock state from %s to %s",
ks_state_to_string (priv->state), ks_state_to_string (next_state));
if (ks_object_set_property (priv->clock_handle, KSPROPSETID_Clock,
KSPROPERTY_CLOCK_STATE, &next_state, sizeof (next_state), NULL)) {
priv->state = next_state;
GST_DEBUG ("Changed clock state to %s", ks_state_to_string (priv->state));
} else {
GST_WARNING ("Failed to change clock state to %s",
ks_state_to_string (next_state));
return FALSE;
}
}
GST_DEBUG ("Finished clock state change from %s to %s",
ks_state_to_string (initial_state), ks_state_to_string (state));
return TRUE;
}
static void
gst_ks_clock_close_unlocked (GstKsClock * self)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
if (priv->closing)
return;
priv->closing = TRUE;
if (priv->worker_thread != NULL) {
priv->worker_running = FALSE;
g_cond_signal (&priv->worker_cond);
GST_KS_CLOCK_UNLOCK ();
g_thread_join (priv->worker_thread);
priv->worker_thread = NULL;
GST_KS_CLOCK_LOCK ();
}
if (priv->open)
gst_ks_clock_set_state_unlocked (self, KSSTATE_STOP);
if (ks_is_valid_handle (priv->clock_handle)) {
CloseHandle (priv->clock_handle);
priv->clock_handle = INVALID_HANDLE_VALUE;
}
if (priv->master_clock != NULL) {
gst_object_unref (priv->master_clock);
priv->master_clock = NULL;
}
priv->open = FALSE;
priv->closing = FALSE;
}
void
gst_ks_clock_close (GstKsClock * self)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
GST_KS_CLOCK_LOCK ();
gst_ks_clock_close_unlocked (self);
GST_KS_CLOCK_UNLOCK ();
}
HANDLE
gst_ks_clock_get_handle (GstKsClock * self)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
HANDLE handle;
GST_KS_CLOCK_LOCK ();
g_assert (priv->open);
handle = priv->clock_handle;
GST_KS_CLOCK_UNLOCK ();
return handle;
}
void
gst_ks_clock_prepare (GstKsClock * self)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
GST_KS_CLOCK_LOCK ();
if (priv->state < KSSTATE_PAUSE)
gst_ks_clock_set_state_unlocked (self, KSSTATE_PAUSE);
GST_KS_CLOCK_UNLOCK ();
}
static gpointer
gst_ks_clock_worker_thread_func (gpointer data)
{
GstKsClock *self = GST_KS_CLOCK (data);
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
GST_KS_CLOCK_LOCK ();
gst_ks_clock_set_state_unlocked (self, KSSTATE_RUN);
while (priv->worker_running) {
if (priv->master_clock != NULL) {
GstClockTime now = gst_clock_get_time (priv->master_clock);
now /= 100;
if (ks_object_set_property (priv->clock_handle, KSPROPSETID_Clock,
KSPROPERTY_CLOCK_TIME, &now, sizeof (now), NULL)) {
GST_DEBUG ("clock synchronized");
gst_object_unref (priv->master_clock);
priv->master_clock = NULL;
} else {
GST_WARNING ("failed to synchronize clock");
}
}
if (!priv->worker_initialized) {
priv->worker_initialized = TRUE;
g_cond_signal (&priv->client_cond);
}
g_cond_wait (&priv->worker_cond, &priv->mutex);
}
priv->worker_initialized = FALSE;
GST_KS_CLOCK_UNLOCK ();
return NULL;
}
void
gst_ks_clock_start (GstKsClock * self)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
GST_KS_CLOCK_LOCK ();
if (priv->worker_thread == NULL) {
priv->worker_running = TRUE;
priv->worker_initialized = FALSE;
priv->worker_thread =
g_thread_new ("ks-worker", gst_ks_clock_worker_thread_func, self);
}
while (!priv->worker_initialized)
g_cond_wait (&priv->client_cond, &priv->mutex);
GST_KS_CLOCK_UNLOCK ();
}
void
gst_ks_clock_provide_master_clock (GstKsClock * self, GstClock * master_clock)
{
GstKsClockPrivate *priv = GST_KS_CLOCK_GET_PRIVATE (self);
GST_KS_CLOCK_LOCK ();
gst_object_ref (master_clock);
if (priv->master_clock != NULL)
gst_object_unref (priv->master_clock);
priv->master_clock = master_clock;
g_cond_signal (&priv->worker_cond);
GST_KS_CLOCK_UNLOCK ();
}