videoio.cxx
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上传日期:2007-01-06
资源大小:1600k
文件大小:4k
- /*
- * videoio.cxx
- *
- * Classes to support streaming video input (grabbing) and output.
- *
- * Portable Windows Library
- *
- * Copyright (c) 1993-2000 Equivalence Pty. Ltd.
- *
- * The contents of this file are subject to the Mozilla Public License
- * Version 1.0 (the "License"); you may not use this file except in
- * compliance with the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- * the License for the specific language governing rights and limitations
- * under the License.
- *
- * The Original Code is Portable Windows Library.
- *
- * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
- *
- * Contributor(s): ______________________________________.
- *
- * $Log: videoio.cxx,v $
- * Revision 1.4 2000/07/26 03:50:50 robertj
- * Added last error variable to video device.
- *
- * Revision 1.3 2000/07/26 02:13:48 robertj
- * Added some more "common" bounds checking to video device.
- *
- * Revision 1.2 2000/07/25 13:38:26 robertj
- * Added frame rate parameter to video frame grabber.
- *
- * Revision 1.1 2000/07/15 09:47:35 robertj
- * Added video I/O device classes.
- *
- */
- #include <ptlib.h>
- #include <ptlib/videoio.h>
- ///////////////////////////////////////////////////////////////////////////////
- // PVideoDevice
- PVideoDevice::PVideoDevice(VideoFormat videofmt,
- unsigned channel,
- ColourFormat colourFmt)
- {
- lastError = 0;
- videoFormat = videofmt;
- channelNumber = channel;
- colourFormat = colourFmt;
- frameRate = 15;
- frameWidth = CIF_WIDTH;
- frameHeight = CIF_HEIGHT;
- }
- BOOL PVideoDevice::SetVideoFormat(VideoFormat videoFmt)
- {
- videoFormat = videoFmt;
- return IsOpen();
- }
- PVideoDevice::VideoFormat PVideoDevice::GetVideoFormat() const
- {
- return videoFormat;
- }
- unsigned PVideoDevice::GetNumChannels() const
- {
- return 1;
- }
- BOOL PVideoDevice::SetChannel(unsigned channelNum)
- {
- if (channelNum >= GetNumChannels())
- return FALSE;
- channelNumber = channelNum;
- return IsOpen();
- }
- unsigned PVideoDevice::GetChannel() const
- {
- return channelNumber;
- }
- BOOL PVideoDevice::SetColourFormat(ColourFormat colourFmt)
- {
- colourFormat = colourFmt;
- return IsOpen();
- }
- PVideoDevice::ColourFormat PVideoDevice::GetColourFormat() const
- {
- return colourFormat;
- }
- BOOL PVideoDevice::SetFrameRate(unsigned rate)
- {
- frameRate = rate;
- return IsOpen();
- }
- unsigned PVideoDevice::GetFrameRate() const
- {
- return frameRate;
- }
- BOOL PVideoDevice::GetFrameSizeLimits(unsigned & minWidth,
- unsigned & minHeight,
- unsigned & maxWidth,
- unsigned & maxHeight) const
- {
- minWidth = minHeight = 1;
- maxWidth = maxHeight = UINT_MAX;
- return FALSE;
- }
- BOOL PVideoDevice::SetFrameSize(unsigned width, unsigned height)
- {
- unsigned minWidth, minHeight, maxWidth, maxHeight;
- GetFrameSizeLimits(minWidth, minHeight, maxWidth, maxHeight);
- if (width < minWidth)
- frameWidth = minWidth;
- else if (width > maxWidth)
- frameWidth = maxWidth;
- else
- frameWidth = width;
- if (height < minHeight)
- frameHeight = minHeight;
- else if (height > maxHeight)
- frameHeight = maxHeight;
- else
- frameHeight = height;
- return IsOpen();
- }
- BOOL PVideoDevice::GetFrameSize(unsigned & width, unsigned & height) const
- {
- width = frameWidth;
- height = frameHeight;
- return IsOpen();
- }
- ///////////////////////////////////////////////////////////////////////////////
- // PVideoInputDevice
- BOOL PVideoInputDevice::GetFrame(PBYTEArray & frame)
- {
- PINDEX returned;
- if (!GetFrameData(frame.GetPointer(GetMaxFrameBytes()), &returned))
- return FALSE;
- frame.SetSize(returned);
- return TRUE;
- }
- // End Of File ///////////////////////////////////////////////////////////////