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Add vsync_delay_clock method to compensate for hardware vsync phase i…
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…ssues.

This also deprecates the use of KeepPhase in favor of handling this in AVSync.

Patch by Mark Spieth.

Closes #7964.
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@tralph
tralph committed Jan 8, 2011
1 parent 956b4f2 commit 3b10231
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Showing 3 changed files with 39 additions and 27 deletions.
20 changes: 13 additions & 7 deletions mythtv/libs/libmythtv/mythplayer.cpp
View file
Expand Up @@ -1708,6 +1708,7 @@ void MythPlayer::AVSync(VideoFrame *buffer, bool limit_delay)

float diverge = 0.0f;
int frameDelay = m_double_framerate ? frame_interval / 2 : frame_interval;
int vsync_delay_clock = 0;
int64_t currentaudiotime = 0;

// attempt to reduce fps for standalone PIP
Expand Down Expand Up @@ -1798,7 +1799,8 @@ void MythPlayer::AVSync(VideoFrame *buffer, bool limit_delay)
osdLock.unlock();
VERBOSE(VB_PLAYBACK|VB_TIMESTAMP, LOC + QString("AVSync waitforframe %1 %2")
.arg(avsync_adjustment).arg(m_double_framerate));
videosync->WaitForFrame(frameDelay + avsync_adjustment + repeat_delay);
vsync_delay_clock = videosync->WaitForFrame
(frameDelay + avsync_adjustment + repeat_delay);
currentaudiotime = AVSyncGetAudiotime();
VERBOSE(VB_PLAYBACK|VB_TIMESTAMP, LOC + "AVSync show");
videoOutput->Show(ps);
Expand Down Expand Up @@ -1828,7 +1830,7 @@ void MythPlayer::AVSync(VideoFrame *buffer, bool limit_delay)
videoOutput->PrepareFrame(buffer, ps, osd);
osdLock.unlock();
// Display the second field
videosync->WaitForFrame(frameDelay + avsync_adjustment);
vsync_delay_clock = videosync->WaitForFrame(frameDelay + avsync_adjustment);
videoOutput->Show(ps);
}

Expand All @@ -1840,7 +1842,7 @@ void MythPlayer::AVSync(VideoFrame *buffer, bool limit_delay)
}
else
{
videosync->WaitForFrame(frameDelay);
vsync_delay_clock = videosync->WaitForFrame(frameDelay);
currentaudiotime = AVSyncGetAudiotime();
}

Expand Down Expand Up @@ -1869,19 +1871,22 @@ void MythPlayer::AVSync(VideoFrame *buffer, bool limit_delay)

if (audio.HasAudioOut() && normal_speed)
{
// must be sampled here due to Show delays
int64_t currentaudiotime = audio.GetAudioTime();
VERBOSE(VB_TIMESTAMP, LOC + QString(
VERBOSE(VB_PLAYBACK+VB_TIMESTAMP, LOC + QString(
"A/V timecodes audio %1 video %2 frameinterval %3 "
"avdel %4 avg %5 tcoffset %6 "
"avp %7 avpen %8")
"avp %7 avpen %8 avdc %9")
.arg(currentaudiotime)
.arg(timecode)
.arg(frame_interval)
.arg(timecode - currentaudiotime)
.arg(timecode - currentaudiotime -
(int)(vsync_delay_clock*audio.GetStretchFactor()+500)/1000)
.arg(avsync_avg)
.arg(tc_wrap[TC_AUDIO])
.arg(avsync_predictor)
.arg(avsync_predictor_enabled)
.arg(vsync_delay_clock)
);
if (currentaudiotime != 0 && timecode != 0)
{ // currentaudiotime == 0 after a seek
Expand All @@ -1903,7 +1908,8 @@ void MythPlayer::AVSync(VideoFrame *buffer, bool limit_delay)
prevtc = timecode;
prevrp = repeat_pict;

avsync_delay = (timecode - currentaudiotime) * 1000;//usec
avsync_delay = (timecode - currentaudiotime) * 1000 -
(int)(vsync_delay_clock*audio.GetStretchFactor()); //usec
// prevents major jitter when pts resets during dvd title
if (avsync_delay > 2000000 && limit_delay)
avsync_delay = 90000;
Expand Down
31 changes: 18 additions & 13 deletions mythtv/libs/libmythtv/vsync.cpp
View file
Expand Up @@ -178,7 +178,7 @@ int VideoSync::CalcDelay()
m_nexttrigger = now + ret_val;
}

if (ret_val < -m_frame_interval)
if (ret_val < -m_frame_interval && m_frame_interval >= m_refresh_interval)
{
ret_val = -m_frame_interval;

Expand All @@ -196,6 +196,7 @@ int VideoSync::CalcDelay()
* delay > 0 which would cause continous rapid fire stuttering.
* This method is only useful for those sync methods where WaitForFrame
* targets hardware retrace rather than targeting nexttrigger.
* NOTE: deprecated in favor of handling phase issues in mythplayer's AVSync.
*/
void VideoSync::KeepPhase()
{
Expand Down Expand Up @@ -293,7 +294,7 @@ void DRMVideoSync::Start(void)
VideoSync::Start();
}

void DRMVideoSync::WaitForFrame(int sync_delay)
int DRMVideoSync::WaitForFrame(int sync_delay)
{
// Offset for externally-provided A/V sync delay
m_nexttrigger += sync_delay;
Expand All @@ -316,7 +317,7 @@ void DRMVideoSync::WaitForFrame(int sync_delay)
if (m_delay > 0)
{
// Wait for any remaining retrace intervals in one pass.
int n = m_delay / m_refresh_interval + 1;
int n = (m_delay + m_refresh_interval - 1) / m_refresh_interval;

drm_wait_vblank_t blank;
blank.request.type = DRM_VBLANK_RELATIVE;
Expand All @@ -327,7 +328,7 @@ void DRMVideoSync::WaitForFrame(int sync_delay)
//cerr << " Delay " << m_delay << endl;
}

KeepPhase();
return m_delay;
}
#endif /* !_WIN32 */

Expand Down Expand Up @@ -397,7 +398,7 @@ void OpenGLVideoSync::Start(void)
#endif /* USING_OPENGL_VSYNC */
}

void OpenGLVideoSync::WaitForFrame(int sync_delay)
int OpenGLVideoSync::WaitForFrame(int sync_delay)
{
(void) sync_delay;
#ifdef USING_OPENGL_VSYNC
Expand All @@ -409,11 +410,11 @@ void OpenGLVideoSync::WaitForFrame(int sync_delay)
m_delay = CalcDelay();
if (m_delay > 0)
usleep(m_delay);
return;
return 0;
}

if (!m_context)
return;
return 0;

unsigned int frameNum = m_context->GetVideoSyncCount();

Expand All @@ -427,12 +428,12 @@ void OpenGLVideoSync::WaitForFrame(int sync_delay)
// Wait for any remaining retrace intervals in one pass.
if (m_delay > 0)
{
uint n = m_delay / m_refresh_interval + 1;
uint n = (m_delay + m_refresh_interval - 1) / m_refresh_interval;
m_context->WaitForVideoSync((n+1), (frameNum+n)%(n+1), &frameNum);
m_delay = CalcDelay();
}

KeepPhase();
return m_delay;
#endif /* USING_OPENGL_VSYNC */
}
#endif /* !_WIN32 */
Expand Down Expand Up @@ -479,7 +480,7 @@ bool RTCVideoSync::TryInit(void)
return true;
}

void RTCVideoSync::WaitForFrame(int sync_delay)
int RTCVideoSync::WaitForFrame(int sync_delay)
{
m_nexttrigger += sync_delay;

Expand All @@ -494,6 +495,7 @@ void RTCVideoSync::WaitForFrame(int sync_delay)
if ((val < 0) && (m_delay > 0))
usleep(m_delay);
}
return 0;
}
#endif /* __linux__ */

Expand All @@ -517,7 +519,7 @@ bool VDPAUVideoSync::TryInit(void)
return true;
}

void VDPAUVideoSync::WaitForFrame(int sync_delay)
int VDPAUVideoSync::WaitForFrame(int sync_delay)
{
// Offset for externally-provided A/V sync delay
m_nexttrigger += sync_delay;
Expand All @@ -528,6 +530,7 @@ void VDPAUVideoSync::WaitForFrame(int sync_delay)

VideoOutputVDPAU *vo = (VideoOutputVDPAU *)(m_video_output);
vo->SetNextFrameDisplayTimeOffset(m_delay);
return 0;
}
#endif

Expand All @@ -548,7 +551,7 @@ bool BusyWaitVideoSync::TryInit(void)
return true;
}

void BusyWaitVideoSync::WaitForFrame(int sync_delay)
int BusyWaitVideoSync::WaitForFrame(int sync_delay)
{
// Offset for externally-provided A/V sync delay
m_nexttrigger += sync_delay;
Expand Down Expand Up @@ -577,6 +580,7 @@ void BusyWaitVideoSync::WaitForFrame(int sync_delay)
if (cnt > 1)
m_cheat -= 200;
}
return 0;
}

USleepVideoSync::USleepVideoSync(VideoOutput *vo,
Expand All @@ -594,13 +598,14 @@ bool USleepVideoSync::TryInit(void)
return true;
}

void USleepVideoSync::WaitForFrame(int sync_delay)
int USleepVideoSync::WaitForFrame(int sync_delay)
{
// Offset for externally-provided A/V sync delay
m_nexttrigger += sync_delay;

m_delay = CalcDelay();
if (m_delay > 0)
usleep(m_delay);
return 0;
}

15 changes: 8 additions & 7 deletions mythtv/libs/libmythtv/vsync.h
View file
Expand Up @@ -64,6 +64,7 @@ class VideoSync
virtual void Start(void);

/** \brief Waits for next a frame or field.
* Returns delay to real frame timing in usec
*
* Start(void), WaitForFrame(void), and Stop(void) should
* always be called from same thread, to prevent bad
Expand All @@ -72,7 +73,7 @@ class VideoSync
* \param sync_delay time until the desired frame or field
* \sa CalcDelay(void), KeepPhase(void)
*/
virtual void WaitForFrame(int sync_delay) = 0;
virtual int WaitForFrame(int sync_delay) = 0;

/// \brief Returns the (minimum) refresh interval of the output device.
int getRefreshInterval(void) const { return m_refresh_interval; }
Expand Down Expand Up @@ -123,7 +124,7 @@ class DRMVideoSync : public VideoSync
QString getName(void) const { return QString("DRM"); }
bool TryInit(void);
void Start(void);
void WaitForFrame(int sync_delay);
int WaitForFrame(int sync_delay);

private:
int m_dri_fd;
Expand Down Expand Up @@ -164,7 +165,7 @@ class OpenGLVideoSync : public VideoSync
QString getName(void) const { return QString("SGI OpenGL"); }
bool TryInit(void);
void Start(void);
void WaitForFrame(int sync_delay);
int WaitForFrame(int sync_delay);

private:
MythRenderOpenGL *m_context;
Expand Down Expand Up @@ -192,7 +193,7 @@ class RTCVideoSync : public VideoSync

QString getName(void) const { return QString("RTC"); }
bool TryInit(void);
void WaitForFrame(int sync_delay);
int WaitForFrame(int sync_delay);

private:
int m_rtcfd;
Expand All @@ -212,7 +213,7 @@ class VDPAUVideoSync : public VideoSync

QString getName(void) const { return QString("VDPAU"); }
bool TryInit(void);
void WaitForFrame(int sync_delay);
int WaitForFrame(int sync_delay);

private:
};
Expand All @@ -239,7 +240,7 @@ class BusyWaitVideoSync : public VideoSync

QString getName(void) const { return QString("USleep with busy wait"); }
bool TryInit(void);
void WaitForFrame(int sync_delay);
int WaitForFrame(int sync_delay);

private:
int m_cheat;
Expand All @@ -266,6 +267,6 @@ class USleepVideoSync : public VideoSync

QString getName(void) const { return QString("USleep"); }
bool TryInit(void);
void WaitForFrame(int sync_delay);
int WaitForFrame(int sync_delay);
};
#endif /* VSYNC_H_INCLUDED */

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