Some UVC video cameras contain metadata in their payload headers. This
patch extracts that data, adding more clock synchronisation information,
on both bulk and isochronous endpoints and makes it available to the
user space on a separate video node, using the V4L2_CAP_META_CAPTURE
capability and the V4L2_BUF_TYPE_META_CAPTURE buffer queue type. Even
though different cameras will have different metadata formats, we use
the same V4L2_META_FMT_UVC pixel format for all of them. Users have to
parse data, based on the specific camera model information. This
version of the patch only creates such metadata nodes for cameras,
specifying a UVC_QUIRK_METADATA_NODE quirk flag.
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@xxxxxxxxx>
---
v6:
- remove an unrelated uvc_ctrl.c chunk
- update comments in uvc_meta_register()
- only process metadata buffers when a metadata node is used
drivers/media/usb/uvc/Makefile | 2 +-
drivers/media/usb/uvc/uvc_driver.c | 12 ++++
drivers/media/usb/uvc/uvc_isight.c | 2 +-
drivers/media/usb/uvc/uvc_metadata.c | 132 +++++++++++++++++++++++++++++++++++
drivers/media/usb/uvc/uvc_queue.c | 41 +++++++++--
drivers/media/usb/uvc/uvc_video.c | 124 +++++++++++++++++++++++++++++---
drivers/media/usb/uvc/uvcvideo.h | 17 ++++-
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
include/uapi/linux/uvcvideo.h | 26 +++++++
9 files changed, 336 insertions(+), 21 deletions(-)
create mode 100644 drivers/media/usb/uvc/uvc_metadata.c
diff --git a/drivers/media/usb/uvc/Makefile b/drivers/media/usb/uvc/Makefile
index c26d12f..06c7cd3 100644
--- a/drivers/media/usb/uvc/Makefile
+++ b/drivers/media/usb/uvc/Makefile
@@ -1,5 +1,5 @@
uvcvideo-objs := uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \
- uvc_status.o uvc_isight.o uvc_debugfs.o
+ uvc_status.o uvc_isight.o uvc_debugfs.o uvc_metadata.o
ifeq ($(CONFIG_MEDIA_CONTROLLER),y)
uvcvideo-objs += uvc_entity.o
endif
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index cfe33bf..3d61cec 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1884,6 +1884,7 @@ static void uvc_unregister_video(struct uvc_device *dev)
continue;
video_unregister_device(&stream->vdev);
+ video_unregister_device(&stream->meta.vdev);
uvc_debugfs_cleanup_stream(stream);
}
@@ -1944,6 +1945,11 @@ static int uvc_register_video(struct uvc_device *dev,
return ret;
}
+ /* Register a metadata node, but ignore a possible failure, complete
+ * registration of video nodes anyway.
+ */
+ uvc_meta_register(stream);
+
if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE;
else
@@ -2041,6 +2047,12 @@ static int uvc_probe(struct usb_interface *intf,
dev->udev = usb_get_dev(udev);
dev->intf = usb_get_intf(intf);
dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
+ if (uvc_quirks_param != -1 &&
+ uvc_quirks_param & UVC_DEV_FLAG_METADATA_NODE) {
+ uvc_quirks_param &= ~UVC_DEV_FLAG_METADATA_NODE;
+ if (uvc_quirks_param == 0)
+ uvc_quirks_param = -1;
+ }
dev->quirks = (uvc_quirks_param == -1)
? id->driver_info : uvc_quirks_param;
diff --git a/drivers/media/usb/uvc/uvc_isight.c b/drivers/media/usb/uvc/uvc_isight.c
index 8510e725..fb940cf 100644
--- a/drivers/media/usb/uvc/uvc_isight.c
+++ b/drivers/media/usb/uvc/uvc_isight.c
@@ -100,7 +100,7 @@ static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf,
}
void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
- struct uvc_buffer *buf)
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf)
{
int ret, i;
diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
new file mode 100644
index 0000000..cbcddcd
--- /dev/null
+++ b/drivers/media/usb/uvc/uvc_metadata.c
@@ -0,0 +1,132 @@
+/*
+ * uvc_metadata.c -- USB Video Class driver - Metadata handling
+ *
+ * Copyright (C) 2016
+ * Guennadi Liakhovetski (guennadi.liakhovetski@xxxxxxxxx)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-v4l2.h>
+#include <media/videobuf2-vmalloc.h>
+
+#include "uvcvideo.h"
+
+/* -----------------------------------------------------------------------------
+ * videobuf2 Queue Operations
+ */
+
+/* -----------------------------------------------------------------------------
+ * V4L2 ioctls
+ */
+
+static int uvc_meta_v4l2_querycap(struct file *file, void *fh,
+ struct v4l2_capability *cap)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct uvc_streaming *stream = video_get_drvdata(vfh->vdev);
+
+ strlcpy(cap->driver, "uvcvideo", sizeof(cap->driver));
+ strlcpy(cap->card, vfh->vdev->name, sizeof(cap->card));
+ usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
+
+ return 0;
+}
+
+static int uvc_meta_v4l2_get_format(struct file *file, void *fh,
+ struct v4l2_format *format)
+{
+ struct v4l2_fh *vfh = file->private_data;
+ struct v4l2_meta_format *fmt = &format->fmt.meta;
+
+ if (format->type != vfh->vdev->queue->type)
+ return -EINVAL;
+
+ memset(fmt, 0, sizeof(*fmt));
+
+ fmt->dataformat = V4L2_META_FMT_UVC;
+ fmt->buffersize = UVC_METATADA_BUF_SIZE;
+
+ return 0;
+}
+
+static const struct v4l2_ioctl_ops uvc_meta_ioctl_ops = {
+ .vidioc_querycap = uvc_meta_v4l2_querycap,
+ .vidioc_g_fmt_meta_cap = uvc_meta_v4l2_get_format,
+ .vidioc_s_fmt_meta_cap = uvc_meta_v4l2_get_format,
+ .vidioc_try_fmt_meta_cap = uvc_meta_v4l2_get_format,
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 File Operations
+ */
+
+static struct v4l2_file_operations uvc_meta_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = video_ioctl2,
+ .open = v4l2_fh_open,
+ .release = vb2_fop_release,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+};
+
+int uvc_meta_register(struct uvc_streaming *stream)
+{
+ struct uvc_device *dev = stream->dev;
+ struct uvc_meta_device *meta = &stream->meta;
+ struct video_device *vdev = &meta->vdev;
+ struct uvc_video_queue *quvc = &meta->queue;
+ int ret;
+
+ /*
+ * Register metadata device nodes only if the METADATA_NODE quirk is
+ * set.
+ */
+ if (!(dev->quirks & UVC_DEV_FLAG_METADATA_NODE))
+ return 0;
+
+ /* COMMENT: consider re-using the code from uvc_driver.c::uvc_register_video() */
+ vdev->v4l2_dev = &dev->vdev;
+ vdev->fops = &uvc_meta_fops;
+ vdev->ioctl_ops = &uvc_meta_ioctl_ops;
+ vdev->release = stream->vdev.release;
+ vdev->prio = &stream->chain->prio;
+ vdev->vfl_dir = VFL_DIR_RX;
+ vdev->queue = &quvc->queue;
+ vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
+ strlcpy(vdev->name, dev->name, sizeof(vdev->name));
+
+ video_set_drvdata(vdev, stream);
+
+ /* Initialize the video buffer queue. */
+ ret = uvc_queue_init(quvc, V4L2_BUF_TYPE_META_CAPTURE, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+ if (ret < 0)
+ uvc_printk(KERN_ERR,
+ "Failed to register metadata device (%d).\n", ret);
+ else
+ kref_get(&dev->ref);
+
+ return ret;
+}
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 371a4ad..45b74e0 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -79,8 +79,19 @@ static int uvc_queue_setup(struct vb2_queue *vq,
unsigned int sizes[], struct device *alloc_devs[])
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
- struct uvc_streaming *stream = uvc_queue_to_stream(queue);
- unsigned size = stream->ctrl.dwMaxVideoFrameSize;
+ struct uvc_streaming *stream;
+ unsigned int size;
+
+ switch (vq->type) {
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ size = UVC_METATADA_BUF_SIZE;
+ break;
+
+ default:
+ stream = uvc_queue_to_stream(queue);
+ size = stream->ctrl.dwMaxVideoFrameSize;
+ break;
+ }
/* Make sure the image size is large enough. */
if (*nplanes)
@@ -109,7 +120,7 @@ static int uvc_buffer_prepare(struct vb2_buffer *vb)
buf->error = 0;
buf->mem = vb2_plane_vaddr(vb, 0);
buf->length = vb2_plane_size(vb, 0);
- if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (vb->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
buf->bytesused = 0;
else
buf->bytesused = vb2_get_plane_payload(vb, 0);
@@ -172,10 +183,10 @@ static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
static void uvc_stop_streaming(struct vb2_queue *vq)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
- struct uvc_streaming *stream = uvc_queue_to_stream(queue);
unsigned long flags;
- uvc_video_enable(stream, 0);
+ if (vq->type != V4L2_BUF_TYPE_META_CAPTURE)
+ uvc_video_enable(uvc_queue_to_stream(queue), 0);
spin_lock_irqsave(&queue->irqlock, flags);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
@@ -193,20 +204,36 @@ static void uvc_stop_streaming(struct vb2_queue *vq)
.stop_streaming = uvc_stop_streaming,
};
+static struct vb2_ops uvc_meta_queue_qops = {
+ .queue_setup = uvc_queue_setup,
+ .buf_prepare = uvc_buffer_prepare,
+ .buf_queue = uvc_buffer_queue,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+ .stop_streaming = uvc_stop_streaming,
+};
+
int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
int drop_corrupted)
{
int ret;
queue->queue.type = type;
- queue->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+ queue->queue.io_modes = VB2_MMAP | VB2_USERPTR;
queue->queue.drv_priv = queue;
queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
- queue->queue.ops = &uvc_queue_qops;
queue->queue.mem_ops = &vb2_vmalloc_memops;
queue->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
| V4L2_BUF_FLAG_TSTAMP_SRC_SOE;
queue->queue.lock = &queue->mutex;
+ switch (type) {
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ queue->queue.ops = &uvc_meta_queue_qops;
+ break;
+ default:
+ queue->queue.io_modes |= VB2_DMABUF;
+ queue->queue.ops = &uvc_queue_qops;
+ }
ret = vb2_queue_init(&queue->queue);
if (ret)
return ret;
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index fb86d6a..5dece04 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1135,6 +1135,73 @@ static int uvc_video_encode_data(struct uvc_streaming *stream,
}
/* ------------------------------------------------------------------------
+ * Metadata
+ */
+
+/*
+ * Ideally we want to capture all payload headers for each frame. However their
+ * number is unknown and unlimited. Additionally to the payload headers we want
+ * to provide the user with USB Frame Numbers and system time values. We also
+ * choose to drop headers, containing only a standard header, which either
+ * contains no SCR value or a value, equal to the previous payload. The
+ * resulting buffer is composed of blocks, containing a 64-bit timestamp in
+ * nanoseconds, a 16-bit USB Frame Number, and a copy of the payload header.
+ */
+static void uvc_video_decode_meta(struct uvc_streaming *stream,
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf,
+ u8 *mem, unsigned int length)
+{
+ struct uvc_meta_buf *meta;
+ size_t len_std = 2;
+ bool has_pts, has_scr;
+ unsigned long flags;
+ struct timespec ts;
+ u8 *scr;
+
+ if (!meta_buf || length == 2 ||
+ meta_buf->length - meta_buf->bytesused <
+ length + sizeof(meta->ns) + sizeof(meta->sof))
+ return;
+
+ has_pts = mem[1] & UVC_STREAM_PTS;
+ has_scr = mem[1] & UVC_STREAM_SCR;
+
+ if (has_pts) {
+ len_std += 4;
+ scr = mem + 6;
+ } else {
+ scr = mem + 2;
+ }
+
+ if (has_scr)
+ len_std += 6;
+
+ if (length == len_std && (!has_scr ||
+ !memcmp(scr, stream->clock.last_scr, 6)))
+ return;
+
+ meta = (struct uvc_meta_buf *)((u8 *)meta_buf->mem + meta_buf->bytesused);
+ local_irq_save(flags);
+ uvc_video_get_ts(&ts);
+ meta->sof = usb_get_current_frame_number(stream->dev->udev);
+ local_irq_restore(flags);
+ meta->ns = timespec_to_ns(&ts);
+
+ if (has_scr)
+ memcpy(stream->clock.last_scr, scr, 6);
+
+ memcpy(&meta->length, mem, length);
+ meta_buf->bytesused += length + sizeof(meta->ns) + sizeof(meta->sof);
+
+ uvc_trace(UVC_TRACE_FRAME,
+ "%s(): t-sys %lu.%09lus, SOF %u, len %u, flags 0x%x, PTS %u, STC %u frame SOF %u\n",
+ __func__, ts.tv_sec, ts.tv_nsec, meta->sof,
+ meta->length, meta->flags, has_pts ? *(u32 *)meta->buf : 0,
+ has_scr ? *(u32 *)scr : 0,
+ has_scr ? *(u32 *)(scr + 4) & 0x7ff : 0);
+}
+
+/* ------------------------------------------------------------------------
* URB handling
*/
@@ -1152,8 +1219,28 @@ static void uvc_video_validate_buffer(const struct uvc_streaming *stream,
/*
* Completion handler for video URBs.
*/
+
+static struct uvc_buffer *uvc_video_step_buffers(struct uvc_streaming *stream,
+ struct uvc_buffer *video_buf, struct uvc_buffer **meta_buf)
+{
+ if (*meta_buf) {
+ struct vb2_v4l2_buffer *vb2_meta = &(*meta_buf)->buf;
+ const struct vb2_v4l2_buffer *vb2_video = &video_buf->buf;
+
+ vb2_meta->sequence = vb2_video->sequence;
+ vb2_meta->field = vb2_video->field;
+ vb2_meta->vb2_buf.timestamp = vb2_video->vb2_buf.timestamp;
+
+ (*meta_buf)->state = UVC_BUF_STATE_READY;
+ (*meta_buf)->error = video_buf->error;
+ *meta_buf = uvc_queue_next_buffer(&stream->meta.queue,
+ *meta_buf);
+ }
+ return uvc_queue_next_buffer(&stream->queue, video_buf);
+}
+
static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
- struct uvc_buffer *buf)
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf)
{
u8 *mem;
int ret, i;
@@ -1175,14 +1262,16 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
urb->iso_frame_desc[i].actual_length);
if (ret == -EAGAIN) {
uvc_video_validate_buffer(stream, buf);
- buf = uvc_queue_next_buffer(&stream->queue,
- buf);
+ buf = uvc_video_step_buffers(stream, buf,
+ &meta_buf);
}
} while (ret == -EAGAIN);
if (ret < 0)
continue;
+ uvc_video_decode_meta(stream, buf, meta_buf, mem, ret);
+
/* Decode the payload data. */
uvc_video_decode_data(stream, buf, mem + ret,
urb->iso_frame_desc[i].actual_length - ret);
@@ -1193,13 +1282,13 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
if (buf->state == UVC_BUF_STATE_READY) {
uvc_video_validate_buffer(stream, buf);
- buf = uvc_queue_next_buffer(&stream->queue, buf);
+ buf = uvc_video_step_buffers(stream, buf, &meta_buf);
}
}
}
static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
- struct uvc_buffer *buf)
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf)
{
u8 *mem;
int len, ret;
@@ -1222,8 +1311,8 @@ static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
do {
ret = uvc_video_decode_start(stream, buf, mem, len);
if (ret == -EAGAIN)
- buf = uvc_queue_next_buffer(&stream->queue,
- buf);
+ buf = uvc_video_step_buffers(stream, buf,
+ &meta_buf);
} while (ret == -EAGAIN);
/* If an error occurred skip the rest of the payload. */
@@ -1233,6 +1322,8 @@ static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
memcpy(stream->bulk.header, mem, ret);
stream->bulk.header_size = ret;
+ uvc_video_decode_meta(stream, buf, meta_buf, mem, ret);
+
mem += ret;
len -= ret;
}
@@ -1256,7 +1347,7 @@ static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
uvc_video_decode_end(stream, buf, stream->bulk.header,
stream->bulk.payload_size);
if (buf->state == UVC_BUF_STATE_READY)
- uvc_queue_next_buffer(&stream->queue, buf);
+ uvc_video_step_buffers(stream, buf, &meta_buf);
}
stream->bulk.header_size = 0;
@@ -1266,7 +1357,7 @@ static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
}
static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream,
- struct uvc_buffer *buf)
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf)
{
u8 *mem = urb->transfer_buffer;
int len = stream->urb_size, ret;
@@ -1312,7 +1403,10 @@ static void uvc_video_complete(struct urb *urb)
{
struct uvc_streaming *stream = urb->context;
struct uvc_video_queue *queue = &stream->queue;
+ struct uvc_video_queue *qmeta = &stream->meta.queue;
+ struct vb2_queue *vb2_qmeta = stream->meta.vdev.queue;
struct uvc_buffer *buf = NULL;
+ struct uvc_buffer *buf_meta = NULL;
unsigned long flags;
int ret;
@@ -1331,6 +1425,8 @@ static void uvc_video_complete(struct urb *urb)
case -ECONNRESET: /* usb_unlink_urb() called. */
case -ESHUTDOWN: /* The endpoint is being disabled. */
uvc_queue_cancel(queue, urb->status == -ESHUTDOWN);
+ if (vb2_qmeta)
+ uvc_queue_cancel(qmeta, urb->status == -ESHUTDOWN);
return;
}
@@ -1340,7 +1436,15 @@ static void uvc_video_complete(struct urb *urb)
queue);
spin_unlock_irqrestore(&queue->irqlock, flags);
- stream->decode(urb, stream, buf);
+ if (vb2_qmeta) {
+ spin_lock_irqsave(&qmeta->irqlock, flags);
+ if (!list_empty(&qmeta->irqqueue))
+ buf_meta = list_first_entry(&qmeta->irqqueue,
+ struct uvc_buffer, queue);
+ spin_unlock_irqrestore(&qmeta->irqlock, flags);
+ }
+
+ stream->decode(urb, stream, buf, buf_meta);
if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index f157cf7..4241f40 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -185,6 +185,7 @@
#define UVC_QUIRK_RESTRICT_FRAME_RATE 0x00000200
#define UVC_QUIRK_RESTORE_CTRLS_ON_INIT 0x00000400
#define UVC_QUIRK_FORCE_Y8 0x00000800
+#define UVC_DEV_FLAG_METADATA_NODE 0x80000000
/* Format flags */
#define UVC_FMT_FLAG_COMPRESSED 0x00000001
@@ -473,6 +474,13 @@ struct uvc_stats_stream {
unsigned int max_sof; /* Maximum STC.SOF value */
};
+struct uvc_meta_device {
+ struct video_device vdev;
+ struct uvc_video_queue queue;
+};
+
+#define UVC_METATADA_BUF_SIZE 1024
+
struct uvc_streaming {
struct list_head list;
struct uvc_device *dev;
@@ -504,7 +512,9 @@ struct uvc_streaming {
unsigned int frozen : 1;
struct uvc_video_queue queue;
void (*decode) (struct urb *urb, struct uvc_streaming *video,
- struct uvc_buffer *buf);
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf);
+
+ struct uvc_meta_device meta;
/* Context data used by the bulk completion handler. */
struct {
@@ -546,6 +556,8 @@ struct uvc_streaming {
u16 last_sof;
u16 sof_offset;
+ u8 last_scr[6];
+
spinlock_t lock;
} clock;
};
@@ -709,6 +721,7 @@ extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
void uvc_video_clock_update(struct uvc_streaming *stream,
struct vb2_v4l2_buffer *vbuf,
struct uvc_buffer *buf);
+int uvc_meta_register(struct uvc_streaming *stream);
/* Status */
extern int uvc_status_init(struct uvc_device *dev);
@@ -763,7 +776,7 @@ extern struct usb_host_endpoint *uvc_find_endpoint(
/* Quirks support */
void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
- struct uvc_buffer *buf);
+ struct uvc_buffer *buf, struct uvc_buffer *meta_buf);
/* debugfs and statistics */
void uvc_debugfs_init(void);
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index cab63bb..0fd0ac2 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1239,6 +1239,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_TCH_FMT_TU08: descr = "8-bit unsigned touch data"; break;
case V4L2_META_FMT_VSP1_HGO: descr = "R-Car VSP1 1-D Histogram"; break;
case V4L2_META_FMT_VSP1_HGT: descr = "R-Car VSP1 2-D Histogram"; break;
+ case V4L2_META_FMT_UVC: descr = "UVC payload header metadata"; break;
default:
/* Compressed formats */
diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
index 3b08186..ffe17ec 100644
--- a/include/uapi/linux/uvcvideo.h
+++ b/include/uapi/linux/uvcvideo.h
@@ -67,4 +67,30 @@ struct uvc_xu_control_query {
#define UVCIOC_CTRL_MAP _IOWR('u', 0x20, struct uvc_xu_control_mapping)
#define UVCIOC_CTRL_QUERY _IOWR('u', 0x21, struct uvc_xu_control_query)
+/*
+ * Metadata node
+ */
+
+/**
+ * struct uvc_meta_buf - metadata buffer building block
+ * @ns - system timestamp of the payload in nanoseconds
+ * @sof - USB Frame Number
+ * @length - length of the payload header
+ * @flags - payload header flags
+ * @buf - optional device-specific header data
+ *
+ * UVC metadata nodes fill buffers with possibly multiple instances of this
+ * struct. The first two fields are added by the driver, they can be used for
+ * clock synchronisation. The rest is an exact copy of a UVC payload header.
+ * Only complete objects with complete buffers are included. Therefore it's
+ * always sizeof(meta->ts) + sizeof(meta->sof) + meta->length bytes large.
+ */
+struct uvc_meta_buf {
+ __u64 ns;
+ __u16 sof;
+ __u8 length;
+ __u8 flags;
+ __u8 buf[];
+};
+
#endif
--
1.9.3
