bool Source::stream_buffers (IStreamable * stream) {
ALint processed = processed_buffer_count();
bool complete = true;
// std::cerr << "Processed buffers = " << processed << std::endl;
AudioError::reset();
while (processed--) {
ALuint buffer;
unqueue_buffers(&buffer, 1);
bool result = stream->load_next_buffer(this, buffer);
if (result) {
queue_buffers(&buffer, 1);
} else {
complete = false;
}
}
AudioError::check("Streaming Buffers");
return complete;
}
static int init_device (int w, int h) {
struct v4l2_capability cap;
struct v4l2_cropcap cropcap;
struct v4l2_crop crop;
struct v4l2_format fmt;
unsigned int min;
if (-1 == xioctl (fd, VIDIOC_QUERYCAP, &cap)) {
if (EINVAL == errno) {
return -1;
} else {
return -1;
}
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
return -1;
}
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
return -1;
}
/* Select video input, video standard and tune here. */
CLEAR (cropcap);
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) {
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect; /* reset to default */
if (-1 == xioctl (fd, VIDIOC_S_CROP, &crop)) {
if (EINVAL == errno) {
/* Cropping not supported (ignored) */
} else {
/* Errors ignored. */
}
}
} else {
/* Errors ignored. */
}
/*
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
fmt.fmt.pix.field = V4L2_FIELD_TOP;
*/
CLEAR (fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = w;
fmt.fmt.pix.height = h;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; //V4L2_PIX_FMT_RGB32;
fmt.fmt.pix.field = V4L2_FIELD_NONE; //V4L2_FIELD_INTERLACED;
if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) {
return -1;
}
/* Note VIDIOC_S_FMT may change width and height. */
//if ((w != fmt.fmt.pix.width) | (h != fmt.fmt.pix.height) | (V4L2_PIX_FMT_RGB32 != fmt.fmt.pix.pixelformat)) {
if ((w != fmt.fmt.pix.width) | (h != fmt.fmt.pix.height) | (V4L2_PIX_FMT_YUYV != fmt.fmt.pix.pixelformat)) {
return -1;
}
/* Buggy driver paranoia. */
min = fmt.fmt.pix.width * 4;
if (fmt.fmt.pix.bytesperline < min)
fmt.fmt.pix.bytesperline = min;
min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
if (fmt.fmt.pix.sizeimage < min)
fmt.fmt.pix.sizeimage = min;
if (0 > init_mmap())
return -1;
if (0 > queue_buffers())
return -1;
/* cache returned dims (make fmt a global?) */
bmWidth = fmt.fmt.pix.width;
bmHeight = fmt.fmt.pix.height;
/* How many bytes to transfer? */
/* NB: Scratch dictates equal or *larger* sized frame than requested */
/* >>> For initial test assuming got frame size requested and "min" above is correct */
sqBufferBytes = min;
sqPixels = bmWidth * bmHeight;
return 0;
}
