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V4L/DVB (11835): uvcvideo: Parse frame descriptors with non-continuous indexes.

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The UVC specification requires frame descriptors indexes to range from 1 to
the number of frame descriptors. At least some Hercules Dualpix Infinite
webcams erroneously use non-continuous index ranges. Make the driver support
them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2009-05-06 12:30:30 -03:00 committed by Mauro Carvalho Chehab
parent 86cf5f84e6
commit 078f894792
2 changed files with 13 additions and 28 deletions
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24
drivers/media/video/uvc/uvc_driver.c
View File

@ -289,10 +289,8 @@ static int uvc_parse_format(struct uvc_device *dev,
struct uvc_format_desc *fmtdesc;
struct uvc_frame *frame;
const unsigned char *start = buffer;
unsigned char *_buffer;
unsigned int interval;
unsigned int i, n;
int _buflen;
__u8 ftype;
format->type = buffer[2];
@ -413,20 +411,11 @@ static int uvc_parse_format(struct uvc_device *dev,
buflen -= buffer[0];
buffer += buffer[0];
/* Count the number of frame descriptors to test the bFrameIndex
* field when parsing the descriptors. We can't rely on the
* bNumFrameDescriptors field as some cameras don't initialize it
* properly.
*/
for (_buflen = buflen, _buffer = buffer;
_buflen > 2 && _buffer[2] == ftype;
_buflen -= _buffer[0], _buffer += _buffer[0])
format->nframes++;
/* Parse the frame descriptors. Only uncompressed, MJPEG and frame
* based formats have frame descriptors.
*/
while (buflen > 2 && buffer[2] == ftype) {
frame = &format->frame[format->nframes];
if (ftype != VS_FRAME_FRAME_BASED)
n = buflen > 25 ? buffer[25] : 0;
else
@ -441,16 +430,6 @@ static int uvc_parse_format(struct uvc_device *dev,
return -EINVAL;
}
if (buffer[3] - 1 >= format->nframes) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
"interface %d frame index %u out of range\n",
dev->udev->devnum, alts->desc.bInterfaceNumber,
buffer[3]);
return -EINVAL;
}
frame = &format->frame[buffer[3] - 1];
frame->bFrameIndex = buffer[3];
frame->bmCapabilities = buffer[4];
frame->wWidth = get_unaligned_le16(&buffer[5]);
@ -507,6 +486,7 @@ static int uvc_parse_format(struct uvc_device *dev,
10000000/frame->dwDefaultFrameInterval,
(100000000/frame->dwDefaultFrameInterval)%10);
format->nframes++;
buflen -= buffer[0];
buffer += buffer[0];
}

17
drivers/media/video/uvc/uvc_video.c
View File

@ -65,7 +65,8 @@ static void uvc_fixup_video_ctrl(struct uvc_video_device *video,
struct uvc_streaming_control *ctrl)
{
struct uvc_format *format;
struct uvc_frame *frame;
struct uvc_frame *frame = NULL;
unsigned int i;
if (ctrl->bFormatIndex <= 0 ||
ctrl->bFormatIndex > video->streaming->nformats)
@ -73,11 +74,15 @@ static void uvc_fixup_video_ctrl(struct uvc_video_device *video,
format = &video->streaming->format[ctrl->bFormatIndex - 1];
if (ctrl->bFrameIndex <= 0 ||
ctrl->bFrameIndex > format->nframes)
return;
for (i = 0; i < format->nframes; ++i) {
if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) {
frame = &format->frame[i];
break;
}
}
frame = &format->frame[ctrl->bFrameIndex - 1];
if (frame == NULL)
return;
if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) ||
(ctrl->dwMaxVideoFrameSize == 0 &&
@ -1089,7 +1094,7 @@ int uvc_video_init(struct uvc_video_device *video)
/* Zero bFrameIndex might be correct. Stream-based formats (including
* MPEG-2 TS and DV) do not support frames but have a dummy frame
* descriptor with bFrameIndex set to zero. If the default frame
* descriptor is not found, use the first avalable frame.
* descriptor is not found, use the first available frame.
*/
for (i = format->nframes; i > 0; --i) {
frame = &format->frame[i-1];