lavfi: Add some common code for OpenCL filtering

1 files changed, 87 insertions, 0 deletions

diff --git a/libavfilter/opencl.h b/libavfilter/opencl.h
new file mode 100644
index 0000000000..4d740c18ab
--- /dev/null
+++ b/libavfilter/opencl.h
@@ -0,0 +1,87 @@
+/*
+ * 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_OPENCL_H
+#define AVFILTER_OPENCL_H
+
+#include "libavutil/buffer.h"
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_opencl.h"
+#include "libavutil/pixfmt.h"
+
+#include "avfilter.h"
+
+typedef struct OpenCLFilterContext {
+    const AVClass     *class;
+
+    AVBufferRef       *device_ref;
+    AVHWDeviceContext *device;
+    AVOpenCLDeviceContext *hwctx;
+
+    cl_program         program;
+
+    enum AVPixelFormat output_format;
+    int                output_width;
+    int                output_height;
+} OpenCLFilterContext;
+
+/**
+ * Return that all inputs and outputs support only AV_PIX_FMT_OPENCL.
+ */
+int ff_opencl_filter_query_formats(AVFilterContext *avctx);
+
+/**
+ * Check that the input link contains a suitable hardware frames
+ * context and extract the device from it.
+ */
+int ff_opencl_filter_config_input(AVFilterLink *inlink);
+
+/**
+ * Create a suitable hardware frames context for the output.
+ */
+int ff_opencl_filter_config_output(AVFilterLink *outlink);
+
+/**
+ * Initialise an OpenCL filter context.
+ */
+int ff_opencl_filter_init(AVFilterContext *avctx);
+
+/**
+ * Uninitialise an OpenCL filter context.
+ */
+void ff_opencl_filter_uninit(AVFilterContext *avctx);
+
+/**
+ * Load a new OpenCL program from strings in memory.
+ *
+ * Creates a new program and compiles it for the current device.
+ * Will log any build errors if compilation fails.
+ */
+int ff_opencl_filter_load_program(AVFilterContext *avctx,
+                                  const char **program_source_array,
+                                  int nb_strings);
+
+/**
+ * Load a new OpenCL program from a file.
+ *
+ * Same as ff_opencl_filter_load_program(), but from a file.
+ */
+int ff_opencl_filter_load_program_from_file(AVFilterContext *avctx,
+                                            const char *filename);
+
+#endif /* AVFILTER_OPENCL_H */