Hi Frank, Thanks for all your work on this. I'm afraid that atm I'm very busy with work, so I don't have time to review your patches. I hope to find some time for this next weekend... Regards, Hans On 10/03/2012 06:48 PM, Frank Schäfer wrote:
Signed-off-by: Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx> --- lib/include/libv4lconvert.h | 20 ++++++++++++++++++-- 1 Datei geändert, 18 Zeilen hinzugefügt(+), 2 Zeilen entfernt(-) diff --git a/lib/include/libv4lconvert.h b/lib/include/libv4lconvert.h index 167b57d..509655e 100644 --- a/lib/include/libv4lconvert.h +++ b/lib/include/libv4lconvert.h @@ -89,8 +89,24 @@ LIBV4L_PUBLIC int v4lconvert_needs_conversion(struct v4lconvert_data *data, const struct v4l2_format *src_fmt, /* in */ const struct v4l2_format *dest_fmt); /* in */ -/* return value of -1 on error, otherwise the amount of bytes written to - dest */ +/* This function does the following conversions: + - format conversion + - cropping + if enabled: + - processing (auto whitebalance, auto gain, gamma correction) + - horizontal/vertical flipping + - 90 degree (clockwise) rotation + + NOTE: the last 3 steps are enabled/disabled depending on + - the internal device list + - the state of the (software emulated) image controls + + Therefore this function should + - not be used when getting the frames from libv4l + - be called only once per frame + Otherwise this may result in unintended double conversions ! + + Returns the amount of bytes written to dest an -1 on error */ LIBV4L_PUBLIC int v4lconvert_convert(struct v4lconvert_data *data, const struct v4l2_format *src_fmt, /* in */ const struct v4l2_format *dest_fmt, /* in */
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