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整理代码

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蒲爽 2026-09-28 21:33:04 +08:00
commit c7b4e178ec
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254
video/v4l2/Device.cpp Executable file
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#include "Device.h"
#include "Logger.h"
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/videodev2.h>
namespace Video
{
namespace V4L2
{
std::string Device::fourcc(unsigned int format)
{
char formatArray[] = {(char)(format & 0xff), (char)((format >> 8) & 0xff), (char)((format >> 16) & 0xff),
(char)((format >> 24) & 0xff), 0};
return std::string(formatArray, strlen(formatArray));
}
unsigned int Device::fourcc(const char* format)
{
char fourcc[4];
memset(&fourcc, 0, sizeof(fourcc));
if (format != NULL)
{
strncpy(fourcc, format, 4);
}
return v4l2_fourcc(fourcc[0], fourcc[1], fourcc[2], fourcc[3]);
}
Device::Device(const DeviceParameters& params, v4l2_buf_type deviceType)
: m_params(params), m_fd(-1), m_deviceType(deviceType), m_bufferSize(0), m_format(0)
{
}
Device::~Device()
{
this->close();
}
void Device::close()
{
if (m_fd != -1)
::close(m_fd);
m_fd = -1;
}
void Device::queryFormat()
{
struct v4l2_format fmt;
memset(&fmt, 0, sizeof(fmt));
fmt.type = m_deviceType;
if (0 == ioctl(m_fd, VIDIOC_G_FMT, &fmt))
{
m_format = fmt.fmt.pix.pixelformat;
m_width = fmt.fmt.pix.width;
m_height = fmt.fmt.pix.height;
m_bufferSize = fmt.fmt.pix.sizeimage;
logger().debug("%s: %s size: %ux%u bufferSize: %u", m_params.m_devName, fourcc(m_format), (uint32_t)m_width,
(uint32_t)m_height, (uint32_t)m_bufferSize);
}
}
bool Device::init(unsigned int mandatoryCapabilities)
{
struct stat sb;
if ((stat(m_params.m_devName.c_str(), &sb) == 0) && ((sb.st_mode & S_IFMT) == S_IFCHR))
{
if (initdevice(m_params.m_devName.c_str(), mandatoryCapabilities) == -1)
{
logger().error("%s: Cannot init device", m_params.m_devName);
}
}
else
{
m_fd = open(m_params.m_devName.c_str(), O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU);
}
return (m_fd != -1);
}
int Device::initdevice(const char* dev_name, unsigned int mandatoryCapabilities)
{
m_fd = open(dev_name, m_params.m_openFlags);
if (m_fd < 0)
{
logger().error("%s: Cannot open device", m_params.m_devName);
this->close();
return -1;
}
if (checkCapabilities(m_fd, mandatoryCapabilities) != 0)
{
this->close();
return -1;
}
if (configureFormat(m_fd) != 0)
{
this->close();
return -1;
}
if (configureParam(m_fd, m_params.m_fps) != 0)
{
this->close();
return -1;
}
return m_fd;
}
int Device::checkCapabilities(int fd, unsigned int mandatoryCapabilities)
{
struct v4l2_capability cap;
memset(&(cap), 0, sizeof(cap));
if (-1 == ioctl(fd, VIDIOC_QUERYCAP, &cap))
{
logger().error("%s: Cannot get capabilities: %d(%s)", m_params.m_devName, errno, std::string(strerror(errno)));
return -1;
}
std::string str = "";
if ((cap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
str += "output,";
if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
str += "capture,";
if ((cap.capabilities & V4L2_CAP_READWRITE))
str += "read/write,";
if ((cap.capabilities & V4L2_CAP_STREAMING))
str += "streaming,";
if ((cap.capabilities & V4L2_CAP_TIMEPERFRAME))
str += "timeperframe";
m_name = (char*)cap.card;
logger().debug("%s(%s): support: %s", m_params.m_devName, m_name, str);
if ((cap.capabilities & mandatoryCapabilities) != mandatoryCapabilities)
{
logger().error("%s: Mandatory capability not available for device", m_params.m_devName);
return -1;
}
return 0;
}
int Device::configureFormat(int fd)
{
this->queryFormat();
unsigned int width = m_width;
unsigned int height = m_height;
if (m_params.m_width != 0)
{
width = m_params.m_width;
}
if (m_params.m_height != 0)
{
height = m_params.m_height;
}
if ((m_params.m_formatList.size() == 0) && (m_format != 0))
{
m_params.m_formatList.push_back(m_format);
}
std::list<unsigned int>::iterator it;
for (it = m_params.m_formatList.begin(); it != m_params.m_formatList.end(); ++it)
{
unsigned int format = *it;
if (this->configureFormat(fd, format, width, height) == 0)
{
this->queryFormat();
return 0;
}
}
return -1;
}
int Device::configureFormat(int fd, unsigned int format, unsigned int width, unsigned int height)
{
struct v4l2_format fmt;
memset(&(fmt), 0, sizeof(fmt));
fmt.type = m_deviceType;
if (ioctl(m_fd, VIDIOC_G_FMT, &fmt) == -1)
{
logger().error("%s: Cannot get format: %d(%s)", m_params.m_devName, errno, std::string(strerror(errno)));
return -1;
}
if (width != 0)
{
fmt.fmt.pix.width = width;
}
if (height != 0)
{
fmt.fmt.pix.height = height;
}
if (format != 0)
{
fmt.fmt.pix.pixelformat = format;
}
if (ioctl(fd, VIDIOC_S_FMT, &fmt) == -1)
{
logger().error("%s: Cannot set format: %d(%s)", m_params.m_devName, errno, std::string(strerror(errno)));
return -1;
}
if (fmt.fmt.pix.pixelformat != format)
{
logger().error("%s: Cannot set pixelformat to: %s format is ", m_params.m_devName, fourcc(format),
fourcc(fmt.fmt.pix.pixelformat));
return -1;
}
if ((fmt.fmt.pix.width != width) || (fmt.fmt.pix.height != height))
{
logger().warning("%s: Cannot set size to: %ux%u size is: %ux%u", m_params.m_devName, (uint32_t)width,
(uint32_t)height, (uint32_t)fmt.fmt.pix.width, (uint32_t)fmt.fmt.pix.height);
}
m_format = fmt.fmt.pix.pixelformat;
m_width = fmt.fmt.pix.width;
m_height = fmt.fmt.pix.height;
m_bufferSize = fmt.fmt.pix.sizeimage;
return 0;
}
int Device::configureParam(int fd, int fps)
{
if (fps != 0)
{
struct v4l2_streamparm param;
memset(&(param), 0, sizeof(param));
param.type = m_deviceType;
param.parm.capture.timeperframe.numerator = 1;
param.parm.capture.timeperframe.denominator = fps;
if (ioctl(fd, VIDIOC_S_PARM, &param) == -1)
{
logger().warning("%s: Cannot set param for device: %d(%s)", m_params.m_devName, errno,
std::string(strerror(errno)));
}
}
return 0;
}
}
}