V4L/DVB (10104): uvcvideo: Add support for video output devices
Extend the range of supported UVC devices by allowing video output devices
matching the following structure:
TT_STREAMING -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> OTT_*
Video output devices are reported with the V4L2_CAP_VIDEO_OUTPUT capability
flag and are subject to the same restrictions as video input devices.
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index 6d0ac3b..e7c3199 100644
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -453,6 +453,34 @@
}
}
+static int uvc_video_encode_header(struct uvc_video_device *video,
+ struct uvc_buffer *buf, __u8 *data, int len)
+{
+ data[0] = 2; /* Header length */
+ data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF
+ | (video->last_fid & UVC_STREAM_FID);
+ return 2;
+}
+
+static int uvc_video_encode_data(struct uvc_video_device *video,
+ struct uvc_buffer *buf, __u8 *data, int len)
+{
+ struct uvc_video_queue *queue = &video->queue;
+ unsigned int nbytes;
+ void *mem;
+
+ /* Copy video data to the URB buffer. */
+ mem = queue->mem + buf->buf.m.offset + queue->buf_used;
+ nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used);
+ nbytes = min(video->bulk.max_payload_size - video->bulk.payload_size,
+ nbytes);
+ memcpy(data, mem, nbytes);
+
+ queue->buf_used += nbytes;
+
+ return nbytes;
+}
+
/* ------------------------------------------------------------------------
* URB handling
*/
@@ -559,6 +587,48 @@
}
}
+static void uvc_video_encode_bulk(struct urb *urb,
+ struct uvc_video_device *video, struct uvc_buffer *buf)
+{
+ u8 *mem = urb->transfer_buffer;
+ int len = video->urb_size, ret;
+
+ if (buf == NULL) {
+ urb->transfer_buffer_length = 0;
+ return;
+ }
+
+ /* If the URB is the first of its payload, add the header. */
+ if (video->bulk.header_size == 0) {
+ ret = uvc_video_encode_header(video, buf, mem, len);
+ video->bulk.header_size = ret;
+ video->bulk.payload_size += ret;
+ mem += ret;
+ len -= ret;
+ }
+
+ /* Process video data. */
+ ret = uvc_video_encode_data(video, buf, mem, len);
+
+ video->bulk.payload_size += ret;
+ len -= ret;
+
+ if (buf->buf.bytesused == video->queue.buf_used ||
+ video->bulk.payload_size == video->bulk.max_payload_size) {
+ if (buf->buf.bytesused == video->queue.buf_used) {
+ video->queue.buf_used = 0;
+ buf->state = UVC_BUF_STATE_DONE;
+ uvc_queue_next_buffer(&video->queue, buf);
+ video->last_fid ^= UVC_STREAM_FID;
+ }
+
+ video->bulk.header_size = 0;
+ video->bulk.payload_size = 0;
+ }
+
+ urb->transfer_buffer_length = video->urb_size - len;
+}
+
static void uvc_video_complete(struct urb *urb)
{
struct uvc_video_device *video = urb->context;
@@ -756,7 +826,15 @@
if (uvc_alloc_urb_buffers(video, size) < 0)
return -ENOMEM;
- pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress);
+ if (usb_endpoint_dir_in(&ep->desc))
+ pipe = usb_rcvbulkpipe(video->dev->udev,
+ ep->desc.bEndpointAddress);
+ else
+ pipe = usb_sndbulkpipe(video->dev->udev,
+ ep->desc.bEndpointAddress);
+
+ if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
+ size = 0;
for (i = 0; i < UVC_URBS; ++i) {
urb = usb_alloc_urb(0, gfp_flags);
@@ -977,12 +1055,22 @@
atomic_set(&video->active, 0);
/* Select the video decoding function */
- if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)
- video->decode = uvc_video_decode_isight;
- else if (video->streaming->intf->num_altsetting > 1)
- video->decode = uvc_video_decode_isoc;
- else
- video->decode = uvc_video_decode_bulk;
+ if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)
+ video->decode = uvc_video_decode_isight;
+ else if (video->streaming->intf->num_altsetting > 1)
+ video->decode = uvc_video_decode_isoc;
+ else
+ video->decode = uvc_video_decode_bulk;
+ } else {
+ if (video->streaming->intf->num_altsetting == 1)
+ video->decode = uvc_video_encode_bulk;
+ else {
+ uvc_printk(KERN_INFO, "Isochronous endpoints are not "
+ "supported for video output devices.\n");
+ return -EINVAL;
+ }
+ }
return 0;
}