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49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
/* ---------------------------------------------------------------------------
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** This software is in the public domain, furnished "as is", without technical
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** support, and with no warranty, express or implied, as to its usefulness for
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** any purpose.
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**
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** V4l2MmapDevice.h
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**
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** V4L2 source using mmap API
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**
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** -------------------------------------------------------------------------*/
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#pragma once
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#include "V4l2Device.h"
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#define V4L2MMAP_NBBUFFER 10
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class V4l2MmapDevice : public V4l2Device
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{
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protected:
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size_t writeInternal(char* buffer, size_t bufferSize);
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bool startPartialWrite();
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size_t writePartialInternal(char*, size_t);
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bool endPartialWrite();
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size_t readInternal(char* buffer, size_t bufferSize);
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public:
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V4l2MmapDevice(const V4L2DeviceParameters & params, v4l2_buf_type deviceType);
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virtual ~V4l2MmapDevice();
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virtual bool init(unsigned int mandatoryCapabilities);
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virtual bool isReady() { return ((m_fd != -1)&& (n_buffers != 0)); }
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virtual bool start();
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virtual bool stop();
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protected:
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unsigned int n_buffers;
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struct buffer
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{
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void * start;
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size_t length;
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};
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buffer m_buffer[V4L2MMAP_NBBUFFER];
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};
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