整理代码

video/v4l2/Output.cpp

@@ -0,0 +1,81 @@
+#include "Output.h"
+#include "MmapDevice.h"
+#include "ReadWriteDevice.h"
+
+#include <string.h>
+
+#include <linux/videodev2.h>
+
+namespace Video
+{
+namespace V4L2
+{
+Output* Output::create(const DeviceParameters& param)
+{
+    Output* videoOutput = NULL;
+    Device* videoDevice = NULL;
+    int     caps        = V4L2_CAP_VIDEO_OUTPUT;
+    switch (param.m_iotype)
+    {
+    case IOTYPE_MMAP:
+        videoDevice = new MmapDevice(param, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+        caps |= V4L2_CAP_STREAMING;
+        break;
+
+    case IOTYPE_READWRITE:
+        videoDevice = new ReadWriteDevice(param, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+        caps |= V4L2_CAP_READWRITE;
+        break;
+    }
+
+    if (videoDevice && !videoDevice->init(caps))
+    {
+        delete videoDevice;
+        videoDevice = NULL;
+    }
+
+    if (videoDevice)
+    {
+        videoOutput = new Output(videoDevice);
+    }
+    return videoOutput;
+}
+
+Output::Output(Device* device): Access(device)
+{
+}
+
+Output::~Output()
+{
+}
+
+bool Output::isWritable(timeval* tv)
+{
+    int    fd = m_device->getFd();
+    fd_set fdset;
+    FD_ZERO(&fdset);
+    FD_SET(fd, &fdset);
+    return (select(fd + 1, NULL, &fdset, NULL, tv) == 1);
+}
+
+size_t Output::write(char* buffer, size_t bufferSize)
+{
+    return m_device->writeInternal(buffer, bufferSize);
+}
+
+bool Output::startPartialWrite()
+{
+    return m_device->startPartialWrite();
+}
+
+size_t Output::writePartial(char* buffer, size_t bufferSize)
+{
+    return m_device->writePartialInternal(buffer, bufferSize);
+}
+
+bool Output::endPartialWrite()
+{
+    return m_device->endPartialWrite();
+}
+}
+}