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directsoundsrc: Use a GstClockID to wait instead of Sleep()

Browse source 
The main advantage is that our sleeps can be interrupted in case of
an src_reset(). Earlier, we would need to wait for a read to complete
before we could do a reset, which could take a long time.

https://bugzilla.gnome.org/show_bug.cgi?id=781249
This commit is contained in:
Nirbheek Chauhan 2017-05-09 16:06:10 +05:30
parent 6026d12d90
commit 8494f1e709
2 changed files with 47 additions and 12 deletions
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56
sys/directsound/gstdirectsoundsrc.c
View file

@ -163,6 +163,9 @@ gst_directsound_src_finalize (GObject * object)
GstDirectSoundSrc *dsoundsrc = GST_DIRECTSOUND_SRC (object);
g_mutex_clear (&dsoundsrc->dsound_lock);
gst_object_unref (dsoundsrc->system_clock);
if (dsoundsrc->read_wait_clock_id != NULL)
gst_clock_id_unref (dsoundsrc->read_wait_clock_id);
g_free (dsoundsrc->device_name);
@ -321,6 +324,9 @@ gst_directsound_src_init (GstDirectSoundSrc * src)
{
GST_DEBUG_OBJECT (src, "initializing directsoundsrc");
g_mutex_init (&src->dsound_lock);
src->system_clock = gst_system_clock_obtain ();
src->read_wait_clock_id = NULL;
src->reset_while_sleeping = FALSE;
src->device_guid = NULL;
src->device_id = NULL;
src->device_name = NULL;
@ -647,8 +653,8 @@ gst_directsound_src_read (GstAudioSrc * asrc, gpointer data, guint length,
GstClockTime * timestamp)
{
GstDirectSoundSrc *dsoundsrc;
guint64 sleep_time_ms;
guint64 slept_time_ms = 0;
guint64 sleep_time_ms, sleep_until;
GstClockID clock_id;
HRESULT hRes; /* Result for windows functions */
DWORD dwCurrentCaptureCursor = 0;
@ -684,7 +690,7 @@ gst_directsound_src_read (GstAudioSrc * asrc, gpointer data, guint length,
}
/* Loop till the source has produced bytes equal to or greater than @length.
*
*
* DirectSound has a notification-based API that uses Windows CreateEvent()
* + WaitForSingleObject(), but it is completely useless for live streams.
*
@ -730,15 +736,40 @@ gst_directsound_src_read (GstAudioSrc * asrc, gpointer data, guint length,
length - dwBufferSize, length * 1000);
/* Make sure we don't run in a tight loop unnecessarily */
sleep_time_ms = MAX (sleep_time_ms, 10);
GST_DEBUG_OBJECT (asrc, "sleeping for %" G_GUINT64_FORMAT "ms",
/* Sleep using gst_clock_id_wait() so that we can be interrupted */
sleep_until = gst_clock_get_time (dsoundsrc->system_clock) +
sleep_time_ms * GST_MSECOND;
/* Setup the clock id wait */
if (G_UNLIKELY (dsoundsrc->read_wait_clock_id == NULL ||
gst_clock_single_shot_id_reinit (dsoundsrc->system_clock,
dsoundsrc->read_wait_clock_id, sleep_until) == FALSE)) {
if (dsoundsrc->read_wait_clock_id != NULL)
gst_clock_id_unref (dsoundsrc->read_wait_clock_id);
dsoundsrc->read_wait_clock_id =
gst_clock_new_single_shot_id (dsoundsrc->system_clock, sleep_until);
}
clock_id = dsoundsrc->read_wait_clock_id;
dsoundsrc->reset_while_sleeping = FALSE;
GST_DEBUG_OBJECT (asrc, "waiting %" G_GUINT64_FORMAT "ms for more data",
sleep_time_ms);
Sleep (sleep_time_ms);
slept_time_ms += sleep_time_ms;
GST_DSOUND_UNLOCK (dsoundsrc);
gst_clock_id_wait (clock_id, NULL);
GST_DSOUND_LOCK (dsoundsrc);
if (dsoundsrc->reset_while_sleeping == TRUE) {
GST_DEBUG_OBJECT (asrc, "reset while sleeping, cancelled read");
GST_DSOUND_UNLOCK (dsoundsrc);
return -1;
}
}
}
GST_DEBUG_OBJECT (asrc, "Got enough data: %lu bytes (wanted at least %u), "
"slept for %" G_GUINT64_FORMAT "ms", dwBufferSize, length, slept_time_ms);
GST_DEBUG_OBJECT (asrc, "Got enough data: %lu bytes (wanted at least %u)",
dwBufferSize, length);
/* Lock the buffer and read only the first @length bytes. Keep the rest in
* the capture buffer for the next read. */
@ -819,12 +850,13 @@ gst_directsound_src_reset (GstAudioSrc * asrc)
dsoundsrc = GST_DIRECTSOUND_SRC (asrc);
#if 0
IDirectSoundCaptureBuffer_Stop (dsoundsrc->pDSBSecondary);
#endif
GST_DSOUND_LOCK (dsoundsrc);
dsoundsrc->reset_while_sleeping = TRUE;
/* Interrupt read sleep if required */
if (dsoundsrc->read_wait_clock_id != NULL)
gst_clock_id_unschedule (dsoundsrc->read_wait_clock_id);
if (dsoundsrc->pDSBSecondary) {
/*stop capturing */
HRESULT hRes = IDirectSoundCaptureBuffer_Stop (dsoundsrc->pDSBSecondary);

3
sys/directsound/gstdirectsoundsrc.h
View file

@ -104,6 +104,9 @@ struct _GstDirectSoundSrc
GMutex dsound_lock;
GstClock *system_clock;
GstClockID *read_wait_clock_id;
gboolean reset_while_sleeping;
};
struct _GstDirectSoundSrcClass