diff options
| author | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2022-05-02 16:42:49 +0200 |
|---|---|---|
| committer | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2022-06-27 10:32:06 +0100 |
| commit | 1c9dc0fd89cfb32d31e25c4d14501c891d329307 (patch) | |
| tree | ef74b3507657560e375da02949f38be79a7115f9 /src | |
| parent | 27cc0a6b58bcca32071cb6ab96e5ee79c75031e5 (diff) | |
libcamera: v4l2_videodevice: Identify non-zero stream starts
V4L2 Video devices should always start streaming from index zero.
Identify and report a warning if they don't, and correct for any offset.
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/libcamera/v4l2_videodevice.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp index 430715af..63911339 100644 --- a/src/libcamera/v4l2_videodevice.cpp +++ b/src/libcamera/v4l2_videodevice.cpp @@ -1771,6 +1771,19 @@ FrameBuffer *V4L2VideoDevice::dequeueBuffer() if (V4L2_TYPE_IS_OUTPUT(buf.type)) return buffer; + /* + * Detect kernel drivers which do not reset the sequence number to zero + * on stream start. + */ + if (!firstFrame_) { + if (buf.sequence) + LOG(V4L2, Warning) + << "Zero sequence expected for first frame (got " + << buf.sequence << ")"; + firstFrame_ = buf.sequence; + } + buffer->metadata_.sequence -= firstFrame_.value(); + unsigned int numV4l2Planes = multiPlanar ? buf.length : 1; FrameMetadata &metadata = buffer->metadata_; @@ -1847,6 +1860,8 @@ int V4L2VideoDevice::streamOn() { int ret; + firstFrame_.reset(); + ret = ioctl(VIDIOC_STREAMON, &bufferType_); if (ret < 0) { LOG(V4L2, Error) |