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_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 18a6192..89d8bd1 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -12,8 +12,8 @@
*/
/*
- * This driver aims to support video input devices compliant with the 'USB
- * Video Class' specification.
+ * This driver aims to support video input and ouput devices compliant with the
+ * 'USB Video Class' specification.
*
* The driver doesn't support the deprecated v4l1 interface. It implements the
* mmap capture method only, and doesn't do any image format conversion in
@@ -609,46 +609,55 @@
}
/* Parse the header descriptor. */
- if (buffer[2] == VS_OUTPUT_HEADER) {
- uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
- "%d OUTPUT HEADER descriptor is not supported.\n",
- dev->udev->devnum, alts->desc.bInterfaceNumber);
- goto error;
- } else if (buffer[2] == VS_INPUT_HEADER) {
- p = buflen >= 5 ? buffer[3] : 0;
- n = buflen >= 12 ? buffer[12] : 0;
+ switch (buffer[2]) {
+ case VS_OUTPUT_HEADER:
+ streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ size = 9;
+ break;
- if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
- uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
- "interface %d INPUT HEADER descriptor is "
- "invalid.\n", dev->udev->devnum,
- alts->desc.bInterfaceNumber);
- goto error;
- }
+ case VS_INPUT_HEADER:
+ streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ size = 13;
+ break;
- streaming->header.bNumFormats = p;
- streaming->header.bEndpointAddress = buffer[6];
- streaming->header.bmInfo = buffer[7];
- streaming->header.bTerminalLink = buffer[8];
- streaming->header.bStillCaptureMethod = buffer[9];
- streaming->header.bTriggerSupport = buffer[10];
- streaming->header.bTriggerUsage = buffer[11];
- streaming->header.bControlSize = n;
-
- streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
- if (streaming->header.bmaControls == NULL) {
- ret = -ENOMEM;
- goto error;
- }
-
- memcpy(streaming->header.bmaControls, &buffer[13], p*n);
- } else {
+ default:
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
"%d HEADER descriptor not found.\n", dev->udev->devnum,
alts->desc.bInterfaceNumber);
goto error;
}
+ p = buflen >= 4 ? buffer[3] : 0;
+ n = buflen >= size ? buffer[size-1] : 0;
+
+ if (buflen < size + p*n) {
+ uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
+ "interface %d HEADER descriptor is invalid.\n",
+ dev->udev->devnum, alts->desc.bInterfaceNumber);
+ goto error;
+ }
+
+ streaming->header.bNumFormats = p;
+ streaming->header.bEndpointAddress = buffer[6];
+ if (buffer[2] == VS_INPUT_HEADER) {
+ streaming->header.bmInfo = buffer[7];
+ streaming->header.bTerminalLink = buffer[8];
+ streaming->header.bStillCaptureMethod = buffer[9];
+ streaming->header.bTriggerSupport = buffer[10];
+ streaming->header.bTriggerUsage = buffer[11];
+ } else {
+ streaming->header.bTerminalLink = buffer[7];
+ }
+ streaming->header.bControlSize = n;
+
+ streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
+ if (streaming->header.bmaControls == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ memcpy(streaming->header.bmaControls, &buffer[size], p*n);
+
buflen -= buffer[0];
buffer += buffer[0];
@@ -1258,6 +1267,26 @@
list_add_tail(&entity->chain, &video->iterms);
break;
+ case TT_STREAMING:
+ if (uvc_trace_param & UVC_TRACE_PROBE)
+ printk(" <- IT %d\n", entity->id);
+
+ if (!UVC_ENTITY_IS_ITERM(entity)) {
+ uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
+ "terminal %u.\n", entity->id);
+ return -1;
+ }
+
+ if (video->sterm != NULL) {
+ uvc_trace(UVC_TRACE_DESCR, "Found multiple streaming "
+ "entities in chain.\n");
+ return -1;
+ }
+
+ list_add_tail(&entity->chain, &video->iterms);
+ video->sterm = entity;
+ break;
+
default:
uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
"0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
@@ -1368,6 +1397,10 @@
entity = video->oterm;
uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
+
+ if (UVC_ENTITY_TYPE(entity) == TT_STREAMING)
+ video->sterm = entity;
+
id = entity->output.bSourceID;
while (id != 0) {
prev = entity;
@@ -1396,8 +1429,11 @@
return id;
}
- /* Initialize the video buffers queue. */
- uvc_queue_init(&video->queue);
+ if (video->sterm == NULL) {
+ uvc_trace(UVC_TRACE_DESCR, "No streaming entity found in "
+ "chain.\n");
+ return -1;
+ }
return 0;
}
@@ -1408,7 +1444,8 @@
* The driver currently supports a single video device per control interface
* only. The terminal and units must match the following structure:
*
- * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
+ * ITT_* -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
+ * TT_STREAMING -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> OTT_*
*
* The Extension Units, if present, must have a single input pin. The
* Processing Unit and Extension Units can be in any order. Additional
@@ -1425,7 +1462,7 @@
list_for_each_entry(term, &dev->entities, list) {
struct uvc_streaming *streaming;
- if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
+ if (!UVC_ENTITY_IS_TERM(term) || !UVC_ENTITY_IS_OTERM(term))
continue;
memset(&dev->video, 0, sizeof dev->video);
@@ -1438,7 +1475,8 @@
continue;
list_for_each_entry(streaming, &dev->streaming, list) {
- if (streaming->header.bTerminalLink == term->id) {
+ if (streaming->header.bTerminalLink ==
+ dev->video.sterm->id) {
dev->video.streaming = streaming;
found = 1;
break;
@@ -1464,6 +1502,9 @@
printk(" -> %d).\n", dev->video.oterm->id);
}
+ /* Initialize the video buffers queue. */
+ uvc_queue_init(&dev->video.queue, dev->video.streaming->type);
+
/* Initialize the streaming interface with default streaming
* parameters.
*/
diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
index 5646a6a..4254634 100644
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -79,12 +79,13 @@
*
*/
-void uvc_queue_init(struct uvc_video_queue *queue)
+void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type)
{
mutex_init(&queue->mutex);
spin_lock_init(&queue->irqlock);
INIT_LIST_HEAD(&queue->mainqueue);
INIT_LIST_HEAD(&queue->irqqueue);
+ queue->type = type;
}
/*
@@ -132,7 +133,7 @@
queue->buffer[i].buf.index = i;
queue->buffer[i].buf.m.offset = i * bufsize;
queue->buffer[i].buf.length = buflength;
- queue->buffer[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ queue->buffer[i].buf.type = queue->type;
queue->buffer[i].buf.sequence = 0;
queue->buffer[i].buf.field = V4L2_FIELD_NONE;
queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP;
@@ -226,7 +227,7 @@
uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index);
- if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+ if (v4l2_buf->type != queue->type ||
v4l2_buf->memory != V4L2_MEMORY_MMAP) {
uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
"and/or memory (%u).\n", v4l2_buf->type,
@@ -249,6 +250,13 @@
goto done;
}
+ if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
+ v4l2_buf->bytesused > buf->buf.length) {
+ uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
+ ret = -EINVAL;
+ goto done;
+ }
+
spin_lock_irqsave(&queue->irqlock, flags);
if (queue->flags & UVC_QUEUE_DISCONNECTED) {
spin_unlock_irqrestore(&queue->irqlock, flags);
@@ -256,7 +264,11 @@
goto done;
}
buf->state = UVC_BUF_STATE_QUEUED;
- buf->buf.bytesused = 0;
+ if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ buf->buf.bytesused = 0;
+ else
+ buf->buf.bytesused = v4l2_buf->bytesused;
+
list_add_tail(&buf->stream, &queue->mainqueue);
list_add_tail(&buf->queue, &queue->irqqueue);
spin_unlock_irqrestore(&queue->irqlock, flags);
@@ -289,7 +301,7 @@
struct uvc_buffer *buf;
int ret = 0;
- if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+ if (v4l2_buf->type != queue->type ||
v4l2_buf->memory != V4L2_MEMORY_MMAP) {
uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
"and/or memory (%u).\n", v4l2_buf->type,
@@ -397,6 +409,7 @@
}
queue->sequence = 0;
queue->flags |= UVC_QUEUE_STREAMING;
+ queue->buf_used = 0;
} else {
uvc_queue_cancel(queue, 0);
INIT_LIST_HEAD(&queue->mainqueue);
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index 2e1fd1b..afcc693 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -110,7 +110,7 @@
int ret = 0;
__u8 *fcc;
- if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (fmt->type != video->streaming->type)
return -EINVAL;
fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
@@ -216,7 +216,7 @@
struct uvc_format *format = video->streaming->cur_format;
struct uvc_frame *frame = video->streaming->cur_frame;
- if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (fmt->type != video->streaming->type)
return -EINVAL;
if (format == NULL || frame == NULL)
@@ -242,7 +242,7 @@
struct uvc_frame *frame;
int ret;
- if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (fmt->type != video->streaming->type)
return -EINVAL;
if (uvc_queue_streaming(&video->queue))
@@ -264,7 +264,7 @@
{
uint32_t numerator, denominator;
- if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (parm->type != video->streaming->type)
return -EINVAL;
numerator = video->streaming->ctrl.dwFrameInterval;
@@ -272,13 +272,21 @@
uvc_simplify_fraction(&numerator, &denominator, 8, 333);
memset(parm, 0, sizeof *parm);
- parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
- parm->parm.capture.capturemode = 0;
- parm->parm.capture.timeperframe.numerator = numerator;
- parm->parm.capture.timeperframe.denominator = denominator;
- parm->parm.capture.extendedmode = 0;
- parm->parm.capture.readbuffers = 0;
+ parm->type = video->streaming->type;
+
+ if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+ parm->parm.capture.capturemode = 0;
+ parm->parm.capture.timeperframe.numerator = numerator;
+ parm->parm.capture.timeperframe.denominator = denominator;
+ parm->parm.capture.extendedmode = 0;
+ parm->parm.capture.readbuffers = 0;
+ } else {
+ parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
+ parm->parm.output.outputmode = 0;
+ parm->parm.output.timeperframe.numerator = numerator;
+ parm->parm.output.timeperframe.denominator = denominator;
+ }
return 0;
}
@@ -288,24 +296,27 @@
{
struct uvc_frame *frame = video->streaming->cur_frame;
struct uvc_streaming_control probe;
+ struct v4l2_fract timeperframe;
uint32_t interval;
int ret;
- if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (parm->type != video->streaming->type)
return -EINVAL;
if (uvc_queue_streaming(&video->queue))
return -EBUSY;
+ if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ timeperframe = parm->parm.capture.timeperframe;
+ else
+ timeperframe = parm->parm.output.timeperframe;
+
memcpy(&probe, &video->streaming->ctrl, sizeof probe);
- interval = uvc_fraction_to_interval(
- parm->parm.capture.timeperframe.numerator,
- parm->parm.capture.timeperframe.denominator);
+ interval = uvc_fraction_to_interval(timeperframe.numerator,
+ timeperframe.denominator);
uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
- parm->parm.capture.timeperframe.numerator,
- parm->parm.capture.timeperframe.denominator,
- interval);
+ timeperframe.numerator, timeperframe.denominator, interval);
probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
/* Probe the device with the new settings. */
@@ -315,11 +326,15 @@
memcpy(&video->streaming->ctrl, &probe, sizeof probe);
/* Return the actual frame period. */
- parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
- parm->parm.capture.timeperframe.denominator = 10000000;
- uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
- &parm->parm.capture.timeperframe.denominator,
- 8, 333);
+ timeperframe.numerator = probe.dwFrameInterval;
+ timeperframe.denominator = 10000000;
+ uvc_simplify_fraction(&timeperframe.numerator,
+ &timeperframe.denominator, 8, 333);
+
+ if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ parm->parm.capture.timeperframe = timeperframe;
+ else
+ parm->parm.output.timeperframe = timeperframe;
return 0;
}
@@ -476,8 +491,12 @@
strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
sizeof cap->bus_info);
cap->version = DRIVER_VERSION_NUMBER;
- cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
- | V4L2_CAP_STREAMING;
+ if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
+ | V4L2_CAP_STREAMING;
+ else
+ cap->capabilities = V4L2_CAP_VIDEO_OUTPUT
+ | V4L2_CAP_STREAMING;
break;
}
@@ -655,7 +674,7 @@
struct v4l2_fmtdesc *fmt = arg;
struct uvc_format *format;
- if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+ if (fmt->type != video->streaming->type ||
fmt->index >= video->streaming->nformats)
return -EINVAL;
@@ -794,7 +813,7 @@
struct v4l2_cropcap *ccap = arg;
struct uvc_frame *frame = video->streaming->cur_frame;
- if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (ccap->type != video->streaming->type)
return -EINVAL;
ccap->bounds.left = 0;
@@ -820,7 +839,7 @@
unsigned int bufsize =
video->streaming->ctrl.dwMaxVideoFrameSize;
- if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+ if (rb->type != video->streaming->type ||
rb->memory != V4L2_MEMORY_MMAP)
return -EINVAL;
@@ -840,7 +859,7 @@
{
struct v4l2_buffer *buf = arg;
- if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (buf->type != video->streaming->type)
return -EINVAL;
if (!uvc_has_privileges(handle))
@@ -866,7 +885,7 @@
{
int *type = arg;
- if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (*type != video->streaming->type)
return -EINVAL;
if (!uvc_has_privileges(handle))
@@ -881,7 +900,7 @@
{
int *type = arg;
- if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (*type != video->streaming->type)
return -EINVAL;
if (!uvc_has_privileges(handle))
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;
}
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index 2a5bdac..731cf79 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -529,6 +529,7 @@
__u16 maxpsize;
struct uvc_streaming_header header;
+ enum v4l2_buf_type type;
unsigned int nformats;
struct uvc_format *format;
@@ -564,12 +565,15 @@
#define UVC_QUEUE_DROP_INCOMPLETE (1 << 2)
struct uvc_video_queue {
+ enum v4l2_buf_type type;
+
void *mem;
unsigned int flags;
__u32 sequence;
unsigned int count;
unsigned int buf_size;
+ unsigned int buf_used;
struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
struct mutex mutex; /* protects buffers and mainqueue */
spinlock_t irqlock; /* protects irqqueue */
@@ -584,8 +588,9 @@
atomic_t active;
unsigned int frozen : 1;
- struct list_head iterms;
- struct uvc_entity *oterm;
+ struct list_head iterms; /* Input terminals */
+ struct uvc_entity *oterm; /* Output terminal */
+ struct uvc_entity *sterm; /* USB streaming terminal */
struct uvc_entity *processing;
struct uvc_entity *selector;
struct list_head extensions;
@@ -726,7 +731,8 @@
extern void uvc_delete(struct kref *kref);
/* Video buffers queue management. */
-extern void uvc_queue_init(struct uvc_video_queue *queue);
+extern void uvc_queue_init(struct uvc_video_queue *queue,
+ enum v4l2_buf_type type);
extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
unsigned int nbuffers, unsigned int buflength);
extern int uvc_free_buffers(struct uvc_video_queue *queue);