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celvideosrc: fix nasty deadlock

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We cannot call any CMBufferQueue functions while holding the lock that
our callback also depends on. So now we make use of CMBufferQueue's
trigger API in order to get notified when the queue has data.
This commit is contained in:
Ole André Vadla Ravnås 2010-11-12 00:40:33 +01:00
parent de76e9fdb6
commit abdb30c567
2 changed files with 51 additions and 35 deletions
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79
sys/applemedia/celvideosrc.c
View file

@ -26,11 +26,11 @@
#define DEFAULT_DEVICE_INDEX -1
#define DEFAULT_DO_STATS FALSE
#define BUFQUEUE_LOCK(instance) GST_OBJECT_LOCK (instance)
#define BUFQUEUE_UNLOCK(instance) GST_OBJECT_UNLOCK (instance)
#define BUFQUEUE_WAIT(instance) \
g_cond_wait (instance->cond, GST_OBJECT_GET_LOCK (instance))
#define BUFQUEUE_NOTIFY(instance) g_cond_signal (instance->cond)
#define QUEUE_READY_LOCK(instance) GST_OBJECT_LOCK (instance)
#define QUEUE_READY_UNLOCK(instance) GST_OBJECT_UNLOCK (instance)
#define QUEUE_READY_WAIT(instance) \
g_cond_wait (instance->ready_cond, GST_OBJECT_GET_LOCK (instance))
#define QUEUE_READY_NOTIFY(instance) g_cond_signal (instance->ready_cond)
GST_DEBUG_CATEGORY (gst_cel_video_src_debug);
#define GST_CAT_DEFAULT gst_cel_video_src_debug
@ -92,7 +92,7 @@ gst_cel_video_src_init (GstCelVideoSrc * self, GstCelVideoSrcClass * gclass)
gst_base_src_set_live (base_src, TRUE);
gst_base_src_set_format (base_src, GST_FORMAT_TIME);
self->cond = g_cond_new ();
self->ready_cond = g_cond_new ();
}
static void
@ -106,7 +106,7 @@ gst_cel_video_src_finalize (GObject * object)
{
GstCelVideoSrc *self = GST_CEL_VIDEO_SRC_CAST (object);
g_cond_free (self->cond);
g_cond_free (self->ready_cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
@ -282,7 +282,7 @@ gst_cel_video_src_start (GstBaseSrc * basesrc)
{
GstCelVideoSrc *self = GST_CEL_VIDEO_SRC_CAST (basesrc);
self->running = TRUE;
g_atomic_int_set (&self->is_running, TRUE);
self->offset = 0;
self->last_sampling = GST_CLOCK_TIME_NONE;
@ -335,10 +335,11 @@ gst_cel_video_src_unlock (GstBaseSrc * basesrc)
{
GstCelVideoSrc *self = GST_CEL_VIDEO_SRC_CAST (basesrc);
BUFQUEUE_LOCK (self);
self->running = FALSE;
BUFQUEUE_NOTIFY (self);
BUFQUEUE_UNLOCK (self);
g_atomic_int_set (&self->is_running, FALSE);
QUEUE_READY_LOCK (self);
QUEUE_READY_NOTIFY (self);
QUEUE_READY_UNLOCK (self);
return TRUE;
}
@ -349,18 +350,16 @@ gst_cel_video_src_unlock_stop (GstBaseSrc * basesrc)
return TRUE;
}
static Boolean
gst_cel_video_src_validate (CMBufferQueueRef queue, CMSampleBufferRef buf,
void *refCon)
static void
gst_cel_video_src_on_queue_ready (void *triggerRefcon,
CMBufferQueueTriggerToken triggerToken)
{
GstCelVideoSrc *self = GST_CEL_VIDEO_SRC_CAST (refCon);
GstCelVideoSrc *self = GST_CEL_VIDEO_SRC_CAST (triggerRefcon);
BUFQUEUE_LOCK (self);
self->has_pending = TRUE;
BUFQUEUE_NOTIFY (self);
BUFQUEUE_UNLOCK (self);
return FALSE;
QUEUE_READY_LOCK (self);
self->queue_is_ready = TRUE;
QUEUE_READY_NOTIFY (self);
QUEUE_READY_UNLOCK (self);
}
static void
@ -437,16 +436,24 @@ gst_cel_video_src_create (GstPushSrc * pushsrc, GstBuffer ** buf)
{
GstCelVideoSrc *self = GST_CEL_VIDEO_SRC_CAST (pushsrc);
GstCMApi *cm = self->ctx->cm;
CMSampleBufferRef sbuf = NULL;
CMSampleBufferRef sbuf;
BUFQUEUE_LOCK (self);
while (self->running && !self->has_pending)
BUFQUEUE_WAIT (self);
sbuf = cm->CMBufferQueueDequeueAndRetain (self->queue);
self->has_pending = !cm->CMBufferQueueIsEmpty (self->queue);
BUFQUEUE_UNLOCK (self);
if (G_UNLIKELY (!self->running))
while (sbuf == NULL) {
QUEUE_READY_LOCK (self);
while (!self->queue_is_ready && g_atomic_int_get (&self->is_running))
QUEUE_READY_WAIT (self);
self->queue_is_ready = FALSE;
QUEUE_READY_UNLOCK (self);
if (G_UNLIKELY (!g_atomic_int_get (&self->is_running)))
goto shutting_down;
sbuf = cm->CMBufferQueueDequeueAndRetain (self->queue);
}
if (G_UNLIKELY (!g_atomic_int_get (&self->is_running)))
goto shutting_down;
*buf = gst_core_media_buffer_new (self->ctx, sbuf);
@ -485,6 +492,7 @@ gst_cel_video_src_open_device (GstCelVideoSrc * self)
FigBaseObjectRef stream_base;
FigBaseVTable *stream_vt;
CMBufferQueueRef queue = NULL;
CMTime ignored_time;
ctx = gst_core_media_ctx_new (GST_API_CORE_VIDEO | GST_API_CORE_MEDIA
| GST_API_MEDIA_TOOLBOX | GST_API_CELESTIAL, &error);
@ -532,10 +540,15 @@ gst_cel_video_src_open_device (GstCelVideoSrc * self)
if (status != noErr)
goto unexpected_error;
self->has_pending = FALSE;
self->queue_is_ready = FALSE;
cm->CMBufferQueueSetValidationCallback (queue,
gst_cel_video_src_validate, self);
ignored_time = cm->CMTimeMake (1, 1);
status = cm->CMBufferQueueInstallTrigger (queue,
gst_cel_video_src_on_queue_ready, self,
kCMBufferQueueTrigger_WhenDataBecomesReady, ignored_time,
&self->ready_trigger);
if (status != noErr)
goto unexpected_error;
self->ctx = ctx;
@ -619,7 +632,9 @@ gst_cel_video_src_close_device (GstCelVideoSrc * self)
self->device_base = NULL;
self->device_base_iface = NULL;
self->ctx->cm->CMBufferQueueRemoveTrigger (self->queue, self->ready_trigger);
self->ctx->cm->FigBufferQueueRelease (self->queue);
self->ready_trigger = NULL;
self->queue = NULL;
g_object_unref (self->ctx);

7
sys/applemedia/celvideosrc.h
View file

@ -61,15 +61,16 @@ struct _GstCelVideoSrc
FigBaseIface *stream_base_iface;
CMBufferQueueRef queue;
CMBufferQueueTriggerToken ready_trigger;
GstCaps *device_caps;
GArray *device_formats;
GstClockTime duration;
volatile gboolean running;
volatile gint is_running;
guint64 offset;
GCond *cond;
volatile gboolean has_pending;
GCond *ready_cond;
volatile gboolean queue_is_ready;
GstClockTime last_sampling;
guint count;