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[media] vivid: add support for reduced frame rate in video capture
With this patch, vivid capture thread can now generate a video with frame rate reduced by a factor of 1000 / 1001. This option can be selected using a control Reduced Framerate from gui. Signed-off-by: Prashant Laddha <prladdha@cisco.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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@ -405,6 +405,7 @@ void vivid_update_format_cap(struct vivid_dev *dev, bool keep_controls)
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{
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struct v4l2_bt_timings *bt = &dev->dv_timings_cap.bt;
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unsigned size;
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u64 pixelclock;
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switch (dev->input_type[dev->input]) {
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case WEBCAM:
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@ -434,8 +435,15 @@ void vivid_update_format_cap(struct vivid_dev *dev, bool keep_controls)
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dev->src_rect.width = bt->width;
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dev->src_rect.height = bt->height;
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size = V4L2_DV_BT_FRAME_WIDTH(bt) * V4L2_DV_BT_FRAME_HEIGHT(bt);
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if (dev->reduced_fps && can_reduce_fps(bt)) {
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pixelclock = div_u64(bt->pixelclock * 1000, 1001);
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bt->flags |= V4L2_DV_FL_REDUCED_FPS;
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} else {
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pixelclock = bt->pixelclock;
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bt->flags &= ~V4L2_DV_FL_REDUCED_FPS;
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}
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dev->timeperframe_vid_cap = (struct v4l2_fract) {
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size / 100, (u32)bt->pixelclock / 100
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size / 100, (u32)pixelclock / 100
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};
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if (bt->interlaced)
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dev->field_cap = V4L2_FIELD_ALTERNATE;
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