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