/* enumerate frames (formats, sizes and fps)
* args:
* width: current selected width
* height: current selected height
*
* returns: pointer to LFormats struct containing list of available frame formats */
bool V4L2Camera::EnumFrameFormats()
{
LOGD("V4L2Camera::EnumFrameFormats");
struct v4l2_fmtdesc fmt;
// Start with no modes
m_AllFmts.clear();
memset(&fmt, 0, sizeof(fmt));
fmt.index = 0;
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
while (ioctl(fd,VIDIOC_ENUM_FMT, &fmt) >= 0) {
fmt.index++;
LOGD("{ pixelformat = '%c%c%c%c', description = '%s' }",
fmt.pixelformat & 0xFF, (fmt.pixelformat >> 8) & 0xFF,
(fmt.pixelformat >> 16) & 0xFF, (fmt.pixelformat >> 24) & 0xFF,
fmt.description);
//enumerate frame sizes for this pixel format
if (!EnumFrameSizes(fmt.pixelformat)) {
LOGE(" Unable to enumerate frame sizes.");
}
};
// Now, select the best preview format and the best PictureFormat
m_BestPreviewFmt = SurfaceDesc();
m_BestPictureFmt = SurfaceDesc();
unsigned int i;
for (i=0; i<m_AllFmts.size(); i++) {
SurfaceDesc s = m_AllFmts[i];
// Prioritize size over everything else when taking pictures. use the
// least fps possible, as that usually means better quality
if ((s.getSize() > m_BestPictureFmt.getSize()) ||
(s.getSize() == m_BestPictureFmt.getSize() && s.getFps() < m_BestPictureFmt.getFps() )
) {
m_BestPictureFmt = s;
}
// Prioritize fps, then size when doing preview
if ((s.getFps() > m_BestPreviewFmt.getFps()) ||
(s.getFps() == m_BestPreviewFmt.getFps() && s.getSize() > m_BestPreviewFmt.getSize() )
) {
m_BestPreviewFmt = s;
}
}
return true;
}
