lavfi: VAAPI VPP common infrastructure.

Re-work the VAAPI common infrastructure to avoid code duplication
between filters.
Signed-off-by: Jun Zhao <jun.zhao@intel.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>

libavfilter/vaapi_vpp.h

+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFILTER_VAAPI_VPP_H
+#define AVFILTER_VAAPI_VPP_H
+
+#include <va/va.h>
+#include <va/va_vpp.h>
+
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_vaapi.h"
+
+#include "avfilter.h"
+
+typedef struct VAAPIVPPContext {
+    const AVClass *class;
+
+    AVVAAPIDeviceContext *hwctx;
+    AVBufferRef *device_ref;
+
+    int valid_ids;
+    VAConfigID  va_config;
+    VAContextID va_context;
+
+    AVBufferRef       *input_frames_ref;
+    AVHWFramesContext *input_frames;
+
+    AVBufferRef       *output_frames_ref;
+    AVHWFramesContext *output_frames;
+
+    enum AVPixelFormat output_format;
+    int output_width;   // computed width
+    int output_height;  // computed height
+
+    VABufferID         filter_buffers[VAProcFilterCount];
+    int                nb_filter_buffers;
+
+    int (*build_filter_params)(AVFilterContext *avctx);
+
+    void (*pipeline_uninit)(AVFilterContext *avctx);
+} VAAPIVPPContext;
+
+void ff_vaapi_vpp_ctx_init(AVFilterContext *avctx);
+
+void ff_vaapi_vpp_ctx_uninit(AVFilterContext *avctx);
+
+int ff_vaapi_vpp_query_formats(AVFilterContext *avctx);
+
+void ff_vaapi_vpp_pipeline_uninit(AVFilterContext *avctx);
+
+int ff_vaapi_vpp_config_input(AVFilterLink *inlink);
+
+int ff_vaapi_vpp_config_output(AVFilterLink *outlink);
+
+int ff_vaapi_vpp_colour_standard(enum AVColorSpace av_cs);
+
+int ff_vaapi_vpp_make_param_buffers(AVFilterContext *avctx,
+                                    int type,
+                                    const void *data,
+                                    size_t size,
+                                    int count);
+
+int ff_vaapi_vpp_render_picture(AVFilterContext *avctx,
+                                VAProcPipelineParameterBuffer *params,
+                                VASurfaceID output_surface);
+
+#endif /* AVFILTER_VAAPI_VPP_H */