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usb: gadget: uvc: configfs: Add frame-based frame format support

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Add support for frame-based frame format, which can be used to support
multiple formats like H264 or H265, in addition to MJPEG and YUV frames.

The frame-based format is set to H264 by default, but it can be updated
to other formats by modifying the GUID through the guid configfs
attribute. Different structures are used for all three formats, as
H264 has a different structure compared to MJPEG and uncompressed
formats. These structures will be passed to the frame make function
based on the active format, using a common frame structure with
additional parameters needed only for frame-based formats. These
parameters are handled at runtime in the UVC driver.

Signed-off-by: Akash Kumar <quic_akakum@quicinc.com>
Link: https://lore.kernel.org/r/20240927152138.31416-1-quic_akakum@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Akash Kumar 2024-09-27 20:51:38 +05:30 • committed by Greg Kroah-Hartman
parent e1b2772ea9
commit 7b5a58952f
5 changed files with 485 additions and 12 deletions
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64
Documentation/ABI/testing/configfs-usb-gadget-uvc
View file

@ -342,6 +342,70 @@ Description: Specific uncompressed frame descriptors
support
========================= =====================================
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/framebased
Date: Sept 2024
KernelVersion: 5.15
Description: Framebased format descriptors
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/framebased/name
Date: Sept 2024
KernelVersion: 5.15
Description: Specific framebased format descriptors
================== =======================================
bFormatIndex unique id for this format descriptor;
only defined after parent header is
linked into the streaming class;
read-only
bmaControls this format's data for bmaControls in
the streaming header
bmInterlaceFlags specifies interlace information,
read-only
bAspectRatioY the X dimension of the picture aspect
ratio, read-only
bAspectRatioX the Y dimension of the picture aspect
ratio, read-only
bDefaultFrameIndex optimum frame index for this stream
bBitsPerPixel number of bits per pixel used to
specify color in the decoded video
frame
guidFormat globally unique id used to identify
stream-encoding format
================== =======================================
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/framebased/name/name
Date: Sept 2024
KernelVersion: 5.15
Description: Specific framebased frame descriptors
========================= =====================================
bFrameIndex unique id for this framedescriptor;
only defined after parent format is
linked into the streaming header;
read-only
dwFrameInterval indicates how frame interval can be
programmed; a number of values
separated by newline can be specified
dwDefaultFrameInterval the frame interval the device would
like to use as default
dwBytesPerLine Specifies the number of bytes per line
of video for packed fixed frame size
formats, allowing the receiver to
perform stride alignment of the video.
If the bVariableSize value (above) is
TRUE (1), or if the format does not
permit such alignment, this value shall
be set to zero (0).
dwMaxBitRate the maximum bit rate at the shortest
frame interval in bps
dwMinBitRate the minimum bit rate at the longest
frame interval in bps
wHeight height of decoded bitmap frame in px
wWidth width of decoded bitmam frame in px
bmCapabilities still image support, fixed frame-rate
support
========================= =====================================
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/header
Date: Dec 2014
KernelVersion: 4.0

348
drivers/usb/gadget/function/uvc_configfs.c
View file

@ -1566,11 +1566,13 @@ static const struct uvcg_config_group_type uvcg_control_grp_type = {
/* -----------------------------------------------------------------------------
* streaming/uncompressed
* streaming/mjpeg
* streaming/framebased
*/
static const char * const uvcg_format_names[] = {
"uncompressed",
"mjpeg",
"framebased",
};
static struct uvcg_color_matching *
@ -1777,6 +1779,9 @@ static int uvcg_streaming_header_allow_link(struct config_item *src,
target_fmt = container_of(to_config_group(target), struct uvcg_format,
group);
if (!target_fmt)
goto out;
uvcg_format_set_indices(to_config_group(target));
format_ptr = kzalloc(sizeof(*format_ptr), GFP_KERNEL);
@ -1816,6 +1821,9 @@ static void uvcg_streaming_header_drop_link(struct config_item *src,
target_fmt = container_of(to_config_group(target), struct uvcg_format,
group);
if (!target_fmt)
goto out;
list_for_each_entry_safe(format_ptr, tmp, &src_hdr->formats, entry)
if (format_ptr->fmt == target_fmt) {
list_del(&format_ptr->entry);
@ -1826,6 +1834,7 @@ static void uvcg_streaming_header_drop_link(struct config_item *src,
--target_fmt->linked;
out:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
}
@ -2022,6 +2031,7 @@ UVCG_FRAME_ATTR(dw_min_bit_rate, dwMinBitRate, 32);
UVCG_FRAME_ATTR(dw_max_bit_rate, dwMaxBitRate, 32);
UVCG_FRAME_ATTR(dw_max_video_frame_buffer_size, dwMaxVideoFrameBufferSize, 32);
UVCG_FRAME_ATTR(dw_default_frame_interval, dwDefaultFrameInterval, 32);
UVCG_FRAME_ATTR(dw_bytes_perline, dwBytesPerLine, 32);
#undef UVCG_FRAME_ATTR
@ -2035,7 +2045,7 @@ static ssize_t uvcg_frame_dw_frame_interval_show(struct config_item *item,
int result, i;
char *pg = page;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = frm->item.ci_parent->ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
@ -2105,7 +2115,7 @@ end:
UVC_ATTR(uvcg_frame_, dw_frame_interval, dwFrameInterval);
static struct configfs_attribute *uvcg_frame_attrs[] = {
static struct configfs_attribute *uvcg_frame_attrs1[] = {
&uvcg_frame_attr_b_frame_index,
&uvcg_frame_attr_bm_capabilities,
&uvcg_frame_attr_w_width,
@ -2118,12 +2128,31 @@ static struct configfs_attribute *uvcg_frame_attrs[] = {
NULL,
};
static const struct config_item_type uvcg_frame_type = {
static struct configfs_attribute *uvcg_frame_attrs2[] = {
&uvcg_frame_attr_b_frame_index,
&uvcg_frame_attr_bm_capabilities,
&uvcg_frame_attr_w_width,
&uvcg_frame_attr_w_height,
&uvcg_frame_attr_dw_min_bit_rate,
&uvcg_frame_attr_dw_max_bit_rate,
&uvcg_frame_attr_dw_default_frame_interval,
&uvcg_frame_attr_dw_frame_interval,
&uvcg_frame_attr_dw_bytes_perline,
NULL,
};
static const struct config_item_type uvcg_frame_type1 = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_frame_attrs,
.ct_attrs = uvcg_frame_attrs1,
.ct_owner = THIS_MODULE,
};
static const struct config_item_type uvcg_frame_type2 = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_attrs = uvcg_frame_attrs2,
.ct_owner = THIS_MODULE,
};
static struct config_item *uvcg_frame_make(struct config_group *group,
const char *name)
{
@ -2145,6 +2174,7 @@ static struct config_item *uvcg_frame_make(struct config_group *group,
h->frame.dw_max_bit_rate = 55296000;
h->frame.dw_max_video_frame_buffer_size = 460800;
h->frame.dw_default_frame_interval = 666666;
h->frame.dw_bytes_perline = 0;
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
@ -2157,6 +2187,9 @@ static struct config_item *uvcg_frame_make(struct config_group *group,
} else if (fmt->type == UVCG_MJPEG) {
h->frame.b_descriptor_subtype = UVC_VS_FRAME_MJPEG;
h->fmt_type = UVCG_MJPEG;
} else if (fmt->type == UVCG_FRAMEBASED) {
h->frame.b_descriptor_subtype = UVC_VS_FRAME_FRAME_BASED;
h->fmt_type = UVCG_FRAMEBASED;
} else {
mutex_unlock(&opts->lock);
kfree(h);
@ -2175,7 +2208,10 @@ static struct config_item *uvcg_frame_make(struct config_group *group,
++fmt->num_frames;
mutex_unlock(&opts->lock);
config_item_init_type_name(&h->item, name, &uvcg_frame_type);
if (fmt->type == UVCG_FRAMEBASED)
config_item_init_type_name(&h->item, name, &uvcg_frame_type2);
else
config_item_init_type_name(&h->item, name, &uvcg_frame_type1);
return &h->item;
}
@ -2215,9 +2251,6 @@ static void uvcg_format_set_indices(struct config_group *fmt)
list_for_each_entry(ci, &fmt->cg_children, ci_entry) {
struct uvcg_frame *frm;
if (ci->ci_type != &uvcg_frame_type)
continue;
frm = to_uvcg_frame(ci);
frm->frame.b_frame_index = i++;
}
@ -2677,6 +2710,251 @@ static const struct uvcg_config_group_type uvcg_mjpeg_grp_type = {
.name = "mjpeg",
};
/* -----------------------------------------------------------------------------
* streaming/framebased/<NAME>
*/
static struct configfs_group_operations uvcg_framebased_group_ops = {
.make_item = uvcg_frame_make,
.drop_item = uvcg_frame_drop,
};
#define UVCG_FRAMEBASED_ATTR_RO(cname, aname, bits) \
static ssize_t uvcg_framebased_##cname##_show(struct config_item *item, \
char *page) \
{ \
struct uvcg_framebased *u = to_uvcg_framebased(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(u->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
UVC_ATTR_RO(uvcg_framebased_, cname, aname)
#define UVCG_FRAMEBASED_ATTR(cname, aname, bits) \
static ssize_t uvcg_framebased_##cname##_show(struct config_item *item, \
char *page) \
{ \
struct uvcg_framebased *u = to_uvcg_framebased(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
result = sprintf(page, "%u\n", le##bits##_to_cpu(u->desc.aname));\
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
return result; \
} \
\
static ssize_t \
uvcg_framebased_##cname##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct uvcg_framebased *u = to_uvcg_framebased(item); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &u->fmt.group.cg_subsys->su_mutex; \
int ret; \
u8 num; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = u->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;\
opts = to_f_uvc_opts(opts_item); \
\
mutex_lock(&opts->lock); \
if (u->fmt.linked || opts->refcnt) { \
ret = -EBUSY; \
goto end; \
} \
\
ret = kstrtou8(page, 0, &num); \
if (ret) \
goto end; \
\
if (num > 255) { \
ret = -EINVAL; \
goto end; \
} \
u->desc.aname = num; \
ret = len; \
end: \
mutex_unlock(&opts->lock); \
mutex_unlock(su_mutex); \
return ret; \
} \
\
UVC_ATTR(uvcg_framebased_, cname, aname)
UVCG_FRAMEBASED_ATTR_RO(b_format_index, bFormatIndex, 8);
UVCG_FRAMEBASED_ATTR_RO(b_bits_per_pixel, bBitsPerPixel, 8);
UVCG_FRAMEBASED_ATTR(b_default_frame_index, bDefaultFrameIndex, 8);
UVCG_FRAMEBASED_ATTR_RO(b_aspect_ratio_x, bAspectRatioX, 8);
UVCG_FRAMEBASED_ATTR_RO(b_aspect_ratio_y, bAspectRatioY, 8);
UVCG_FRAMEBASED_ATTR_RO(bm_interface_flags, bmInterfaceFlags, 8);
#undef UVCG_FRAMEBASED_ATTR
#undef UVCG_FRAMEBASED_ATTR_RO
static ssize_t uvcg_framebased_guid_format_show(struct config_item *item,
char *page)
{
struct uvcg_framebased *ch = to_uvcg_framebased(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &ch->fmt.group.cg_subsys->su_mutex;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = ch->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
memcpy(page, ch->desc.guidFormat, sizeof(ch->desc.guidFormat));
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return sizeof(ch->desc.guidFormat);
}
static ssize_t uvcg_framebased_guid_format_store(struct config_item *item,
const char *page, size_t len)
{
struct uvcg_framebased *ch = to_uvcg_framebased(item);
struct f_uvc_opts *opts;
struct config_item *opts_item;
struct mutex *su_mutex = &ch->fmt.group.cg_subsys->su_mutex;
int ret;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
opts_item = ch->fmt.group.cg_item.ci_parent->ci_parent->ci_parent;
opts = to_f_uvc_opts(opts_item);
mutex_lock(&opts->lock);
if (ch->fmt.linked || opts->refcnt) {
ret = -EBUSY;
goto end;
}
memcpy(ch->desc.guidFormat, page,
min(sizeof(ch->desc.guidFormat), len));
ret = sizeof(ch->desc.guidFormat);
end:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
return ret;
}
UVC_ATTR(uvcg_framebased_, guid_format, guidFormat);
static inline ssize_t
uvcg_framebased_bma_controls_show(struct config_item *item, char *page)
{
struct uvcg_framebased *u = to_uvcg_framebased(item);
return uvcg_format_bma_controls_show(&u->fmt, page);
}
static inline ssize_t
uvcg_framebased_bma_controls_store(struct config_item *item,
const char *page, size_t len)
{
struct uvcg_framebased *u = to_uvcg_framebased(item);
return uvcg_format_bma_controls_store(&u->fmt, page, len);
}
UVC_ATTR(uvcg_framebased_, bma_controls, bmaControls);
static struct configfs_attribute *uvcg_framebased_attrs[] = {
&uvcg_framebased_attr_b_format_index,
&uvcg_framebased_attr_b_default_frame_index,
&uvcg_framebased_attr_b_bits_per_pixel,
&uvcg_framebased_attr_b_aspect_ratio_x,
&uvcg_framebased_attr_b_aspect_ratio_y,
&uvcg_framebased_attr_bm_interface_flags,
&uvcg_framebased_attr_bma_controls,
&uvcg_framebased_attr_guid_format,
NULL,
};
static const struct config_item_type uvcg_framebased_type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_framebased_group_ops,
.ct_attrs = uvcg_framebased_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_framebased_make(struct config_group *group,
const char *name)
{
static char guid[] = { /*Declear frame based as H264 format*/
'H', '2', '6', '4', 0x00, 0x00, 0x10, 0x00,
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
};
struct uvcg_framebased *h;
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return ERR_PTR(-ENOMEM);
h->desc.bLength = UVC_DT_FORMAT_FRAMEBASED_SIZE;
h->desc.bDescriptorType = USB_DT_CS_INTERFACE;
h->desc.bDescriptorSubType = UVC_VS_FORMAT_FRAME_BASED;
memcpy(h->desc.guidFormat, guid, sizeof(guid));
h->desc.bBitsPerPixel = 0;
h->desc.bDefaultFrameIndex = 1;
h->desc.bAspectRatioX = 0;
h->desc.bAspectRatioY = 0;
h->desc.bmInterfaceFlags = 0;
h->desc.bCopyProtect = 0;
h->desc.bVariableSize = 1;
INIT_LIST_HEAD(&h->fmt.frames);
h->fmt.type = UVCG_FRAMEBASED;
config_group_init_type_name(&h->fmt.group, name,
&uvcg_framebased_type);
return &h->fmt.group;
}
static struct configfs_group_operations uvcg_framebased_grp_ops = {
.make_group = uvcg_framebased_make,
};
static const struct uvcg_config_group_type uvcg_framebased_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_group_ops = &uvcg_framebased_grp_ops,
.ct_owner = THIS_MODULE,
},
.name = "framebased",
};
/* -----------------------------------------------------------------------------
* streaming/color_matching/default
*/
@ -2912,6 +3190,7 @@ static int __uvcg_iter_strm_cls(struct uvcg_streaming_header *h,
if (ret)
return ret;
grp = &f->fmt->group;
j = 0;
list_for_each_entry(item, &grp->cg_children, ci_entry) {
frm = to_uvcg_frame(item);
ret = fun(frm, priv2, priv3, j++, UVCG_FRAME);
@ -2965,6 +3244,11 @@ static int __uvcg_cnt_strm(void *priv1, void *priv2, void *priv3, int n,
container_of(fmt, struct uvcg_mjpeg, fmt);
*size += sizeof(m->desc);
} else if (fmt->type == UVCG_FRAMEBASED) {
struct uvcg_framebased *f =
container_of(fmt, struct uvcg_framebased, fmt);
*size += sizeof(f->desc);
} else {
return -EINVAL;
}
@ -2975,6 +3259,11 @@ static int __uvcg_cnt_strm(void *priv1, void *priv2, void *priv3, int n,
int sz = sizeof(frm->dw_frame_interval);
*size += sizeof(frm->frame);
/*
* framebased has duplicate member with uncompressed and
* mjpeg, so minus it
*/
*size -= sizeof(u32);
*size += frm->frame.b_frame_interval_type * sz;
}
break;
@ -2991,6 +3280,27 @@ static int __uvcg_cnt_strm(void *priv1, void *priv2, void *priv3, int n,
return 0;
}
static int __uvcg_copy_framebased_desc(void *dest, struct uvcg_frame *frm,
int sz)
{
struct uvc_frame_framebased *desc = dest;
desc->bLength = frm->frame.b_length;
desc->bDescriptorType = frm->frame.b_descriptor_type;
desc->bDescriptorSubType = frm->frame.b_descriptor_subtype;
desc->bFrameIndex = frm->frame.b_frame_index;
desc->bmCapabilities = frm->frame.bm_capabilities;
desc->wWidth = frm->frame.w_width;
desc->wHeight = frm->frame.w_height;
desc->dwMinBitRate = frm->frame.dw_min_bit_rate;
desc->dwMaxBitRate = frm->frame.dw_max_bit_rate;
desc->dwDefaultFrameInterval = frm->frame.dw_default_frame_interval;
desc->bFrameIntervalType = frm->frame.b_frame_interval_type;
desc->dwBytesPerLine = frm->frame.dw_bytes_perline;
return 0;
}
/*
* Fill an array of streaming descriptors.
*
@ -3045,6 +3355,15 @@ static int __uvcg_fill_strm(void *priv1, void *priv2, void *priv3, int n,
m->desc.bNumFrameDescriptors = fmt->num_frames;
memcpy(*dest, &m->desc, sizeof(m->desc));
*dest += sizeof(m->desc);
} else if (fmt->type == UVCG_FRAMEBASED) {
struct uvcg_framebased *f =
container_of(fmt, struct uvcg_framebased,
fmt);
f->desc.bFormatIndex = n + 1;
f->desc.bNumFrameDescriptors = fmt->num_frames;
memcpy(*dest, &f->desc, sizeof(f->desc));
*dest += sizeof(f->desc);
} else {
return -EINVAL;
}
@ -3054,8 +3373,11 @@ static int __uvcg_fill_strm(void *priv1, void *priv2, void *priv3, int n,
struct uvcg_frame *frm = priv1;
struct uvc_descriptor_header *h = *dest;
sz = sizeof(frm->frame);
memcpy(*dest, &frm->frame, sz);
sz = sizeof(frm->frame) - 4;
if (frm->fmt_type != UVCG_FRAMEBASED)
memcpy(*dest, &frm->frame, sz);
else
__uvcg_copy_framebased_desc(*dest, frm, sz);
*dest += sz;
sz = frm->frame.b_frame_interval_type *
sizeof(*frm->dw_frame_interval);
@ -3066,7 +3388,10 @@ static int __uvcg_fill_strm(void *priv1, void *priv2, void *priv3, int n,
frm->frame.b_frame_interval_type);
else if (frm->fmt_type == UVCG_MJPEG)
h->bLength = UVC_DT_FRAME_MJPEG_SIZE(
frm->frame.b_frame_interval_type);
frm->frame.b_frame_interval_type);
else if (frm->fmt_type == UVCG_FRAMEBASED)
h->bLength = UVC_DT_FRAME_FRAMEBASED_SIZE(
frm->frame.b_frame_interval_type);
}
break;
case UVCG_COLOR_MATCHING: {
@ -3285,6 +3610,7 @@ static const struct uvcg_config_group_type uvcg_streaming_grp_type = {
&uvcg_streaming_header_grp_type,
&uvcg_uncompressed_grp_type,
&uvcg_mjpeg_grp_type,
&uvcg_framebased_grp_type,
&uvcg_color_matching_grp_type,
&uvcg_streaming_class_grp_type,
NULL,

16
drivers/usb/gadget/function/uvc_configfs.h
View file

@ -49,6 +49,7 @@ container_of(group_ptr, struct uvcg_color_matching, group)
enum uvcg_format_type {
UVCG_UNCOMPRESSED = 0,
UVCG_MJPEG,
UVCG_FRAMEBASED,
};
struct uvcg_format {
@ -105,6 +106,7 @@ struct uvcg_frame {
u32 dw_max_video_frame_buffer_size;
u32 dw_default_frame_interval;
u8 b_frame_interval_type;
u32 dw_bytes_perline;
} __attribute__((packed)) frame;
u32 *dw_frame_interval;
};
@ -142,6 +144,20 @@ static inline struct uvcg_mjpeg *to_uvcg_mjpeg(struct config_item *item)
return container_of(to_uvcg_format(item), struct uvcg_mjpeg, fmt);
}
/* -----------------------------------------------------------------------------
* streaming/framebased/<NAME>
*/
struct uvcg_framebased {
struct uvcg_format fmt;
struct uvc_format_framebased desc;
};
static inline struct uvcg_framebased *to_uvcg_framebased(struct config_item *item)
{
return container_of(to_uvcg_format(item), struct uvcg_framebased, fmt);
}
/* -----------------------------------------------------------------------------
* control/extensions/<NAME>
*/

11
drivers/usb/gadget/function/uvc_v4l2.c
View file

@ -31,13 +31,22 @@ static const struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat)
{
char guid[16] = UVC_GUID_FORMAT_MJPEG;
const struct uvc_format_desc *format;
struct uvcg_uncompressed *unc;
if (uformat->type == UVCG_UNCOMPRESSED) {
struct uvcg_uncompressed *unc;
unc = to_uvcg_uncompressed(&uformat->group.cg_item);
if (!unc)
return ERR_PTR(-EINVAL);
memcpy(guid, unc->desc.guidFormat, sizeof(guid));
} else if (uformat->type == UVCG_FRAMEBASED) {
struct uvcg_framebased *unc;
unc = to_uvcg_framebased(&uformat->group.cg_item);
if (!unc)
return ERR_PTR(-EINVAL);
memcpy(guid, unc->desc.guidFormat, sizeof(guid));
}

58
include/uapi/linux/usb/video.h
View file

@ -597,5 +597,63 @@ struct UVC_FRAME_MJPEG(n) { \
__le32 dwFrameInterval[n]; \
} __attribute__ ((packed))
/* Frame Based Payload - 3.1.1. Frame Based Video Format Descriptor */
struct uvc_format_framebased {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bFormatIndex;
__u8 bNumFrameDescriptors;
__u8 guidFormat[16];
__u8 bBitsPerPixel;
__u8 bDefaultFrameIndex;
__u8 bAspectRatioX;
__u8 bAspectRatioY;
__u8 bmInterfaceFlags;
__u8 bCopyProtect;
__u8 bVariableSize;
} __attribute__((__packed__));
#define UVC_DT_FORMAT_FRAMEBASED_SIZE 28
/* Frame Based Payload - 3.1.2. Frame Based Video Frame Descriptor */
struct uvc_frame_framebased {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bFrameIndex;
__u8 bmCapabilities;
__u16 wWidth;
__u16 wHeight;
__u32 dwMinBitRate;
__u32 dwMaxBitRate;
__u32 dwDefaultFrameInterval;
__u8 bFrameIntervalType;
__u32 dwBytesPerLine;
__u32 dwFrameInterval[];
} __attribute__((__packed__));
#define UVC_DT_FRAME_FRAMEBASED_SIZE(n) (26+4*(n))
#define UVC_FRAME_FRAMEBASED(n) \
uvc_frame_framebased_##n
#define DECLARE_UVC_FRAME_FRAMEBASED(n) \
struct UVC_FRAME_FRAMEBASED(n) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bFrameIndex; \
__u8 bmCapabilities; \
__u16 wWidth; \
__u16 wHeight; \
__u32 dwMinBitRate; \
__u32 dwMaxBitRate; \
__u32 dwDefaultFrameInterval; \
__u8 bFrameIntervalType; \
__u32 dwBytesPerLine; \
__u32 dwFrameInterval[n]; \
} __attribute__ ((packed))
#endif /* __LINUX_USB_VIDEO_H */