videofilter: don't map writable in passthrough
In passthrough mode we shouldn't map the buffer in write mode because the buffer might not be writable.
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@ -277,8 +277,14 @@ gst_video_filter_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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fclass = GST_VIDEO_FILTER_GET_CLASS (filter);
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if (fclass->transform_frame_ip) {
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GstVideoFrame frame;
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GstMapFlags flags;
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if (!gst_video_frame_map (&frame, &filter->in_info, buf, GST_MAP_READWRITE))
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flags = GST_MAP_READ;
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if (!gst_base_transform_is_passthrough (trans))
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flags |= GST_MAP_WRITE;
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if (!gst_video_frame_map (&frame, &filter->in_info, buf, flags))
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goto invalid_buffer;
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res = fclass->transform_frame_ip (filter, &frame);
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