157 lines
4.8 KiB
C++
157 lines
4.8 KiB
C++
/*
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OpenPnp-Capture: a video capture subsystem.
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Linux platform code
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Stream class
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Created by Niels Moseley on 7/6/17.
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Copyright (c) 2017 Niels Moseley.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#ifndef linux_platformstream_h
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#define linux_platformstream_h
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#include <stdint.h>
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#include <vector>
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#include <mutex>
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#include <thread>
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#include <linux/videodev2.h>
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#include "../common/logging.h"
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#include "../common/stream.h"
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#include "mjpeghelper.h"
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class Context; // pre-declaration
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class PlatformStream; // pre-declaration
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/** A helper class to take care of allocation and
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de-allocation of memory mapped V4L2 buffers */
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class PlatformStreamHelper
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{
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public:
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PlatformStreamHelper(int fd) : m_fd(fd)
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{
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LOG(LOG_DEBUG, "PlatformStreamHelper created.\n");
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}
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virtual ~PlatformStreamHelper()
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{
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if (m_buffers.size() != 0)
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{
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streamOff();
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unmapAndDeleteBuffers();
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}
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LOG(LOG_DEBUG, "PlatformStreamHelper deleted.\n");
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}
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/** remove the memory mapped buffers from the system */
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void unmapAndDeleteBuffers();
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/** create a number of memory mapped buffers */
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bool createAndMapBuffers(uint32_t nBuffers);
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/** queue all the buffer for use by V4L2 */
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bool queueAllBuffers();
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/** tell V4L2 to start frame capturing */
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bool streamOn();
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/** tell V4L2 to stop frame capturing */
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bool streamOff();
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/** return a pointer to the buffer with a certain index
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in m_buffers vector */
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void* getBufferPointer(uint32_t index) const
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{
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if (index < m_buffers.size())
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{
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return m_buffers[index].start;
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}
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else
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{
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return nullptr;
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}
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}
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struct bufferInfo
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{
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void* start; // pointer to start of buffer
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size_t length; // length of buffer in bytes
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};
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std::vector<bufferInfo> m_buffers;
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int m_fd;
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};
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/** Platform dependent code to support Linux using V4L2 */
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class PlatformStream : public Stream
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{
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public:
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PlatformStream();
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virtual ~PlatformStream();
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/** Open a capture stream to a device and request a specific (internal) stream format.
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When succesfully opened, capturing starts immediately.
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*/
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virtual bool open(Context *owner, deviceInfo *device, uint32_t width, uint32_t height,
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uint32_t fourCC, uint32_t fps) override;
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/** Close a capture stream */
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virtual void close() override;
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/** Return the FOURCC media type of the stream */
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virtual uint32_t getFOURCC() override;
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virtual bool setProperty(uint32_t propID, int32_t value) override;
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virtual bool setAutoProperty(uint32_t propID, bool enabled) override;
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virtual bool getPropertyLimits(uint32_t propID,
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int32_t *min, int32_t *max, int32_t *dValue) override;
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virtual bool getProperty(uint32_t propID, int32_t &value) override;
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virtual bool getAutoProperty(uint32_t propID, bool &enabled) override;
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virtual bool setFrameRate(uint32_t fps) override;
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/** called by the capture thread/function to query if it
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should quit */
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bool getThreadQuitState() const
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{
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return m_quitThread;
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}
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/** public submit buffer so the capture thread/function
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can access it. In additon, this function handles any
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conversion to RGB output buffers, if necessary */
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void threadSubmitBuffer(void *ptr, size_t bytes);
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protected:
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int m_deviceHandle; ///< V4L2 device handle
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v4l2_format m_fmt; ///< V4L2 frame format
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bool m_quitThread; ///< if true, captureThreadFunction should return
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std::thread *m_helperThread; ///< helper object threading control
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MJPEGHelper m_mjpegHelper; ///< helper to convert MJPEG stream to RGB
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};
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#endif |