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Improve error message for VIDIOC_STREAMON "no space left on device".

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This commit is contained in:
Peter Johnson
2016-12-11 00:02:02 -08:00
parent 28a2ba4bf8
commit c08a489e27
1 changed files with 13 additions and 1 deletions
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14
src/UsbCameraImpl.cpp
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@@ -713,7 +713,19 @@ bool UsbCameraImpl::DeviceStreamOn() {
// Turn stream on
int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (DoIoctl(fd, VIDIOC_STREAMON, &type) != 0) return false;
if (TryIoctl(fd, VIDIOC_STREAMON, &type) < 0) {
if (errno == ENOSPC) {
// indicates too much USB bandwidth requested
SERROR(
"could not start streaming due to USB bandwidth limitations; try a "
"lower resolution or a different pixel format (VIDIOC_STREAMON: "
"No space left on device)");
} else {
// some other error
SERROR("ioctl VIDIOC_STREAMON failed: " << std::strerror(errno));
}
return false;
}
SDEBUG4("enabled streaming");
m_streaming = true;
return true;