| Message ID | 20241111173639.25131-2-isaac.scott@ideasonboard.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Fix Sonix Technology MJPEG streams | expand |
Hi Isaac, Thank you for the patch. On Mon, Nov 11, 2024 at 05:36:38PM +0000, Isaac Scott wrote: > Some cameras, such as the Sonix Technology Co. 292A exhibit issues when Nitpicking, s/ exhibit/, exhibit/ > running two parallel streams, causing USB packets to be dropped when an > H.264 stream posts a keyframe while an MJPEG stream is running > simultaneously. This occasionally causes the driver to erroneously > output two consecutive JPEG images as a single frame. > > To fix this, we inspect the buffer, and trigger a new frame when we > find an SOI. > > Signed-off-by: Isaac Scott <isaac.scott@ideasonboard.com> > --- > drivers/media/usb/uvc/uvc_video.c | 27 ++++++++++++++++++++++++++- > drivers/media/usb/uvc/uvcvideo.h | 1 + > 2 files changed, 27 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c > index e00f38dd07d9..028f16dc189a 100644 > --- a/drivers/media/usb/uvc/uvc_video.c > +++ b/drivers/media/usb/uvc/uvc_video.c > @@ -21,6 +21,7 @@ > #include <linux/unaligned.h> > > #include <media/v4l2-common.h> > +#include <media/jpeg.h> Alphabetical order please. This helps avoiding duplicates in long lists of includes as they can be spotted more easily. > > #include "uvcvideo.h" > > @@ -1117,6 +1118,7 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, > struct uvc_buffer *buf, const u8 *data, int len) > { > u8 fid; > + u8 header_len; The kernel has a tendency to roughly sort variables by decreasing line length, and the uvcvideo driver follows that rule when nothing else makes it impractical. > > /* > * Sanity checks: > @@ -1129,6 +1131,8 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, > return -EINVAL; > } > > + header_len = data[0]; > + And I'd drop the blank line here. > fid = data[1] & UVC_STREAM_FID; > > /* > @@ -1210,9 +1214,30 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, > return -EAGAIN; > } > > + /* > + * Some cameras, when running two parallel streams (one MJPEG alongside > + * another non-MJPEG stream), are known to lose the EOF packet for a frame. > + * We can detect the end of a frame by checking for a new SOI marker, as > + * the SOI always lies on the packet boundary between two frames. I would add "for these devices" at the end of the sentence. I expect it to be universally true, but we haven't checked. > + */ > + if ((stream->dev->quirks & UVC_QUIRK_MJPEG_NO_EOF) && > + (stream->cur_format->fcc == V4L2_PIX_FMT_MJPEG || > + stream->cur_format->fcc == V4L2_PIX_FMT_JPEG)) { > + const u8 *packet = ((const u8 *)data) + header_len; No need for the outer parentheses. > + > + if (len - header_len > 2 && I would have written if (len > header_len + 2 && and shouldn't it actually be if (len >= header_len + 2 && ? > + packet[0] == 0xff && packet[1] == JPEG_MARKER_SOI && > + buf->bytesused != 0) { > + buf->state = UVC_BUF_STATE_READY; > + buf->error = 1; > + stream->last_fid ^= UVC_STREAM_FID; > + return -EAGAIN; > + } > + } > + > stream->last_fid = fid; > > - return data[0]; > + return header_len; > } > > static inline enum dma_data_direction uvc_stream_dir( > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h > index b7d24a853ce4..116b1e383c25 100644 > --- a/drivers/media/usb/uvc/uvcvideo.h > +++ b/drivers/media/usb/uvc/uvcvideo.h > @@ -76,6 +76,7 @@ > #define UVC_QUIRK_NO_RESET_RESUME 0x00004000 > #define UVC_QUIRK_DISABLE_AUTOSUSPEND 0x00008000 > #define UVC_QUIRK_INVALID_DEVICE_SOF 0x00010000 > +#define UVC_QUIRK_MJPEG_NO_EOF 0x00020000 Please use tabs for indentation, like in the previous lines. > > /* Format flags */ > #define UVC_FMT_FLAG_COMPRESSED 0x00000001
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index e00f38dd07d9..028f16dc189a 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -21,6 +21,7 @@ #include <linux/unaligned.h> #include <media/v4l2-common.h> +#include <media/jpeg.h> #include "uvcvideo.h" @@ -1117,6 +1118,7 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, struct uvc_buffer *buf, const u8 *data, int len) { u8 fid; + u8 header_len; /* * Sanity checks: @@ -1129,6 +1131,8 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return -EINVAL; } + header_len = data[0]; + fid = data[1] & UVC_STREAM_FID; /* @@ -1210,9 +1214,30 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return -EAGAIN; } + /* + * Some cameras, when running two parallel streams (one MJPEG alongside + * another non-MJPEG stream), are known to lose the EOF packet for a frame. + * We can detect the end of a frame by checking for a new SOI marker, as + * the SOI always lies on the packet boundary between two frames. + */ + if ((stream->dev->quirks & UVC_QUIRK_MJPEG_NO_EOF) && + (stream->cur_format->fcc == V4L2_PIX_FMT_MJPEG || + stream->cur_format->fcc == V4L2_PIX_FMT_JPEG)) { + const u8 *packet = ((const u8 *)data) + header_len; + + if (len - header_len > 2 && + packet[0] == 0xff && packet[1] == JPEG_MARKER_SOI && + buf->bytesused != 0) { + buf->state = UVC_BUF_STATE_READY; + buf->error = 1; + stream->last_fid ^= UVC_STREAM_FID; + return -EAGAIN; + } + } + stream->last_fid = fid; - return data[0]; + return header_len; } static inline enum dma_data_direction uvc_stream_dir( diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index b7d24a853ce4..116b1e383c25 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -76,6 +76,7 @@ #define UVC_QUIRK_NO_RESET_RESUME 0x00004000 #define UVC_QUIRK_DISABLE_AUTOSUSPEND 0x00008000 #define UVC_QUIRK_INVALID_DEVICE_SOF 0x00010000 +#define UVC_QUIRK_MJPEG_NO_EOF 0x00020000 /* Format flags */ #define UVC_FMT_FLAG_COMPRESSED 0x00000001
Some cameras, such as the Sonix Technology Co. 292A exhibit issues when running two parallel streams, causing USB packets to be dropped when an H.264 stream posts a keyframe while an MJPEG stream is running simultaneously. This occasionally causes the driver to erroneously output two consecutive JPEG images as a single frame. To fix this, we inspect the buffer, and trigger a new frame when we find an SOI. Signed-off-by: Isaac Scott <isaac.scott@ideasonboard.com> --- drivers/media/usb/uvc/uvc_video.c | 27 ++++++++++++++++++++++++++- drivers/media/usb/uvc/uvcvideo.h | 1 + 2 files changed, 27 insertions(+), 1 deletion(-)