video4dc1394.cxx

安装 H323需要的pwlib库

  PTRACE(1, deviceName << " " << channelNumber);

  quadlet_t supported_framerates;
  if (dc1394_query_supported_framerates(handle, camera_nodes[channelNumber],
					FORMAT_VGA_NONCOMPRESSED, dc1394_mode,
					&supported_framerates) != DC1394_SUCCESS) {
    PTRACE(1, "dc1394_query_supported_framerates() failed.");
    return FALSE;
  }

  int framerate;

  // supported_framerates seems always in the network byte order.
  if (supported_framerates & (1U << (31-5)))
    framerate = FRAMERATE_60;
  else if (supported_framerates & (1U << (31-4)))
    framerate = FRAMERATE_30;
  else if (supported_framerates & (1U << (31-3)))
    framerate = FRAMERATE_15;
  else if (supported_framerates & (1U << (31-2)))
    framerate = FRAMERATE_7_5;
  else if (supported_framerates & (1U << (31-1)))
    framerate = FRAMERATE_3_75;
  else if (supported_framerates & (1U << (31-0)))
    framerate = FRAMERATE_1_875;
  else {
    PTRACE(1, "No supported frame rate??!!" << supported_framerates);
    return FALSE;
  }  

  // In order to compile the following line, you need libdc1394 0.9.0 or later.
  if ((UseDMA &&dc1394_dma_setup_capture(handle,camera_nodes[channelNumber],
                           0, /* channel of IEEE 1394 */ 
                           FORMAT_VGA_NONCOMPRESSED,
                           dc1394_mode,
                           P_DC1394_DEFAULT_SPEED,
                           framerate, 4, 1, deviceName,
			 &camera)!=DC1394_SUCCESS) ||
      (!UseDMA && dc1394_setup_capture(handle,camera_nodes[channelNumber],
                           0, /* channel of IEEE 1394 */ 
                           FORMAT_VGA_NONCOMPRESSED,
                           dc1394_mode,
                           P_DC1394_DEFAULT_SPEED,
                           framerate,
		       &camera)!=DC1394_SUCCESS))
  {
    PTRACE(0,"unable to setup camera-\n"
             "check " __FILE__ " to make sure\n"
             "that the video mode,framerate and format are\n"
             "supported by your camera\n");
    return FALSE;
  }

  /*-----------------------------------------------------------------------
   *  have the camera start sending us data
   *-----------------------------------------------------------------------*/
  if (dc1394_start_iso_transmission(handle,camera.node)
      !=DC1394_SUCCESS) 
  {
    PTRACE(0, "unable to start camera iso transmission\n");
    if (UseDMA)
      dc1394_dma_release_camera(handle,&camera);
    else
      dc1394_release_camera(handle,&camera);
    return FALSE;
  }
  is_capturing = TRUE;
#ifdef ESTIMATE_CAPTURE_PERFORMANCE
  PTime now;
  start_time = now.GetTimestamp();
  num_captured = 0;
#endif
  return TRUE;
}


BOOL PVideoInput1394DcDevice::Stop()
{
  if (IsCapturing()) {
    dc1394_stop_iso_transmission(handle,camera.node);
    if (UseDMA) {
    dc1394_dma_unlisten(handle, &camera);
    dc1394_dma_release_camera(handle,&camera);
    } else
      dc1394_release_camera(handle,&camera);
    is_capturing = FALSE;
    return TRUE;
  } else
    return FALSE;
}


BOOL PVideoInput1394DcDevice::IsCapturing()
{
  return is_capturing;
}

PStringList PVideoInput1394DcDevice::GetInputDeviceNames()
{
  PStringList list;

  if (PFile::Exists("/dev/raw1394"))
    list.AppendString("/dev/raw1394");
  if (PFile::Exists("/dev/video1394/0"))
    // DEVFS naming scheme
    for (int i=0; ; i++) {
      PString devname = PString("/dev/video1394/") + PString(i);
      if (PFile::Exists(devname))
	list.AppendString(devname);
      else
	break;
    }
  else if (PFile::Exists("/dev/video1394"))
    /* traditional naming */
    list.AppendString("/dev/video1394");
  return list;
}


BOOL PVideoInput1394DcDevice::SetVideoFormat(VideoFormat newFormat)
{
  if (!PVideoDevice::SetVideoFormat(newFormat)) {
    PTRACE(3,"PVideoDevice::SetVideoFormat\t failed for format "<<newFormat);
    return FALSE;
  }
  return TRUE;
}

int PVideoInput1394DcDevice::GetBrightness()
{
  return -1;
}


BOOL PVideoInput1394DcDevice::SetBrightness(unsigned newBrightness)
{
  return FALSE;
}


int PVideoInput1394DcDevice::GetHue()
{
  return -1;
}


BOOL PVideoInput1394DcDevice::SetHue(unsigned newHue)
{
  return FALSE;
}


int PVideoInput1394DcDevice::GetContrast()
{
  return -1;
}


BOOL PVideoInput1394DcDevice::SetContrast(unsigned newContrast)
{
  return FALSE;
}

BOOL PVideoInput1394DcDevice::SetColour(unsigned newColour) 
{
  return -1;
}

int PVideoInput1394DcDevice::GetColour()
{
  return -1;
}


BOOL PVideoInput1394DcDevice::SetWhiteness(unsigned newWhiteness) 
{
  return FALSE;
}

int PVideoInput1394DcDevice::GetWhiteness()
{
  return -1;
}


BOOL PVideoInput1394DcDevice::GetParameters (int *whiteness, int *brightness,
                                       int *colour, int *contrast, int *hue)
{
  *whiteness = -1;
  *brightness = -1;
  *colour = -1;
  *hue = -1;
  return FALSE;
}


int PVideoInput1394DcDevice::GetNumChannels() 
{
  return numCameras;
}


BOOL PVideoInput1394DcDevice::SetChannel(int newChannel)
{
  if (PVideoDevice::SetChannel(newChannel) == FALSE)
    return FALSE;
  if(IsCapturing()) {
    Stop();
    Start();
  }
  return TRUE;
}



BOOL PVideoInput1394DcDevice::SetFrameRate(unsigned rate)
{
  return PVideoDevice::SetFrameRate(rate);
}


BOOL PVideoInput1394DcDevice::GetFrameSizeLimits(unsigned & minWidth,
                                           unsigned & minHeight,
                                           unsigned & maxWidth,
                                           unsigned & maxHeight) 
{
  minWidth = 160;
  maxWidth = 320;
  minHeight = 120;
  maxHeight = 240;
  return TRUE;
}



PINDEX PVideoInput1394DcDevice::GetMaxFrameBytes()
{
  if (converter != NULL) {
    PINDEX bytes = converter->GetMaxDstFrameBytes();
    if (bytes > frameBytes)
      return bytes;
  }

  return frameBytes;
}

BOOL PVideoInput1394DcDevice::GetFrameDataNoDelay(BYTE * buffer, PINDEX * bytesReturned)
{
  if (!IsCapturing()) return FALSE;

  PTRACE(3, "We are going to single capture.\n");
  if ((UseDMA && dc1394_dma_single_capture(&camera)!=DC1394_SUCCESS) ||
      (!UseDMA && dc1394_single_capture(handle,&camera)!=DC1394_SUCCESS)){
    PTRACE(1, "dc1394_single_capture() failed.");
    return FALSE;
  }
  
  PTRACE(3, "single captured, try to convert\n");

  // If converting on the fly do it from frame store to output buffer, otherwise do
  // straight copy.
  if (converter != NULL)
    converter->Convert((const BYTE *)camera.capture_buffer, buffer, bytesReturned);
  else {
    PTRACE(1, "Converter must exist. Something goes wrong.");
    return FALSE;
  }

#ifdef ESTIMATE_CAPTURE_PERFORMANCE
  ++num_captured;
  PTime now;
  double capturing_time = (double)((now.GetTimestamp()-start_time))/1000000;
  ::fprintf(stderr, "time %f, num_captured=%d, fps=%f\n",
	    capturing_time, num_captured, num_captured/capturing_time);
#endif

  if (UseDMA)
    dc1394_dma_done_with_buffer(&camera);
  return TRUE;
}

BOOL PVideoInput1394DcDevice::GetFrameData(BYTE * buffer, PINDEX * bytesReturned)
{
  if(frameRate>0) {
    if (msBetweenFrames > capturing_duration)
      PThread::Current()->Sleep(msBetweenFrames - capturing_duration);
    PTime start;
    if ( !GetFrameDataNoDelay(buffer, bytesReturned))
      return FALSE;
    PTime end;
    capturing_duration = (int)((end-start).GetMilliSeconds());
    return TRUE;
  }
  return GetFrameDataNoDelay(buffer,bytesReturned);
}


void PVideoInput1394DcDevice::ClearMapping()
{
}


BOOL PVideoInput1394DcDevice::TestAllFormats()
{
  return TRUE;
}

BOOL PVideoInput1394DcDevice::SetColourFormat(const PString & newFormat)
{
  if (newFormat != colourFormat) {
    return FALSE;
  }
  return TRUE;
}


BOOL PVideoInput1394DcDevice::SetFrameSize(unsigned width, unsigned height)
{
  if ((!(width == 320 && height == 240)) &&
      (!(width == 160 && height == 120)))
    return FALSE;

  frameWidth = width;
  frameHeight = height;

  if (frameWidth == 320 && frameHeight == 240)
    colourFormat = "UYVY422";
  else if (frameWidth == 160 && frameHeight == 120)
    colourFormat = "UYV444";

  frameBytes = PVideoDevice::CalculateFrameBytes(frameWidth, frameHeight, colourFormat);
  
  if (IsCapturing()) {
    Stop(); Start();
  }

  return TRUE;
}


BOOL PVideoInput1394DcDevice::SetFrameSizeConverter(unsigned width, unsigned height,
					 BOOL bScaleNotCrop)
{
  if (width == CIFWidth && height == CIFHeight)
    SetFrameSize(320, 240);
  else if (width == QCIFWidth && height == QCIFHeight)
    SetFrameSize(160, 120);
  else {
    PTRACE(1, width << "x" << height << " is not supported.");
    return FALSE;
  }

  if (converter != NULL) 
    delete converter;
  
  desiredFrameWidth = width;
  desiredFrameHeight = height;

  converter = PColourConverter::Create(colourFormat, desiredColourFormat, width, height);
  if (converter == NULL) {
    PTRACE(1, "Failed to make a converter.");
    return FALSE;
  }
  if (converter->SetSrcFrameSize(frameWidth, frameHeight) == FALSE) {
    PTRACE(1, "Failed to set source frame size of a converter.");
    return FALSE;
  }
  return TRUE;
}

BOOL PVideoInput1394DcDevice::SetColourFormatConverter(const PString & colourFmt)
{
  if (colourFmt != "YUV420P") {
    PTRACE(1, colourFmt << " is unsupported.");
    return FALSE;
  }
  desiredColourFormat = colourFmt;
  return SetFrameSizeConverter(desiredFrameWidth, desiredFrameHeight, FALSE);
}


    
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