---
Just some setup code (making output frames and compiling shaders) which will be
needed in every filter.
libavfilter/opencl.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++
libavfilter/opencl.h | 87 ++++++++++++++++++
2 files changed, 331 insertions(+)
create mode 100644 libavfilter/opencl.c
create mode 100644 libavfilter/opencl.h
diff --git a/libavfilter/opencl.c b/libavfilter/opencl.c
new file mode 100644
index 0000000000..824a6b15ed
--- /dev/null
+++ b/libavfilter/opencl.c
@@ -0,0 +1,244 @@
+/*
+ * 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
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_opencl.h"
+#include "libavutil/mem.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "opencl.h"
+
+int ff_opencl_filter_query_formats(AVFilterContext *avctx)
+{
+ const static enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_OPENCL,
+ AV_PIX_FMT_NONE,
+ };
+ AVFilterFormats *formats;
+
+ formats = ff_make_format_list(pix_fmts);
+ if (!formats)
+ return AVERROR(ENOMEM);
+
+ ff_set_common_formats(avctx, formats);
+
+ return 0;
+}
+
+int ff_opencl_filter_config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *avctx = inlink->dst;
+ OpenCLFilterContext *ctx = avctx->priv;
+ AVHWFramesContext *input_frames;
+
+ if (!inlink->hw_frames_ctx) {
+ av_log(avctx, AV_LOG_ERROR, "OpenCL filtering requires a "
+ "hardware frames context on the input.\n");
+ return AVERROR(EINVAL);
+ }
+
+ // Extract the device and default output format from the first input.
+ if (avctx->inputs[0] != inlink)
+ return 0;
+
+ input_frames = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
+
+ if (input_frames->format != AV_PIX_FMT_OPENCL)
+ return AVERROR(EINVAL);
+
+ ctx->device_ref = av_buffer_ref(input_frames->device_ref);
+ if (!ctx->device_ref)
+ return AVERROR(ENOMEM);
+ ctx->device = input_frames->device_ctx;
+ ctx->hwctx = ctx->device->hwctx;
+
+ // Default output parameters match input parameters.
+ if (ctx->output_format == AV_PIX_FMT_NONE)
+ ctx->output_format = input_frames->sw_format;
+ if (!ctx->output_width)
+ ctx->output_width = inlink->w;
+ if (!ctx->output_height)
+ ctx->output_height = inlink->h;
+
+ return 0;
+}
+
+int ff_opencl_filter_config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *avctx = outlink->src;
+ OpenCLFilterContext *ctx = avctx->priv;
+ AVBufferRef *output_frames_ref = NULL;
+ AVHWFramesContext *output_frames;
+ int err;
+
+ av_buffer_unref(&outlink->hw_frames_ctx);
+
+ output_frames_ref = av_hwframe_ctx_alloc(ctx->device_ref);
+ if (!output_frames_ref) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+ output_frames = (AVHWFramesContext*)output_frames_ref->data;
+
+ output_frames->format = AV_PIX_FMT_OPENCL;
+ output_frames->sw_format = ctx->output_format;
+ output_frames->width = ctx->output_width;
+ output_frames->height = ctx->output_height;
+
+ err = av_hwframe_ctx_init(output_frames_ref);
+ if (err < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to initialise output "
+ "frames: %d.\n", err);
+ goto fail;
+ }
+
+ outlink->hw_frames_ctx = output_frames_ref;
+ outlink->w = ctx->output_width;
+ outlink->h = ctx->output_height;
+
+ return 0;
+fail:
+ av_buffer_unref(&output_frames_ref);
+ return err;
+}
+
+int ff_opencl_filter_init(AVFilterContext *avctx)
+{
+ OpenCLFilterContext *ctx = avctx->priv;
+
+ ctx->output_format = AV_PIX_FMT_NONE;
+
+ return 0;
+}
+
+void ff_opencl_filter_uninit(AVFilterContext *avctx)
+{
+ OpenCLFilterContext *ctx = avctx->priv;
+ cl_int cle;
+
+ if (ctx->program) {
+ cle = clReleaseProgram(ctx->program);
+ if (cle != CL_SUCCESS)
+ av_log(avctx, AV_LOG_ERROR, "Failed to release "
+ "program: %d.\n", cle);
+ }
+
+ av_buffer_unref(&ctx->device_ref);
+}
+
+static int opencl_filter_load_program(AVFilterContext *avctx,
+ const char **program_source_array,
+ int nb_strings)
+{
+ OpenCLFilterContext *ctx = avctx->priv;
+ cl_int cle;
+
+ ctx->program = clCreateProgramWithSource(ctx->hwctx->context, nb_strings,
+ program_source_array,
+ NULL, &cle);
+ if (!ctx->program) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to create program: %d.\n", cle);
+ return AVERROR(EIO);
+ }
+
+ cle = clBuildProgram(ctx->program, 1, &ctx->hwctx->device_id,
+ NULL, NULL, NULL);
+ if (cle != CL_SUCCESS) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to build program: %d.\n", cle);
+
+ if (cle == CL_BUILD_PROGRAM_FAILURE) {
+ char *log;
+ size_t log_length;
+
+ clGetProgramBuildInfo(ctx->program, ctx->hwctx->device_id,
+ CL_PROGRAM_BUILD_LOG, 0, NULL, &log_length);
+
+ log = av_malloc(log_length);
+ if (log) {
+ cle = clGetProgramBuildInfo(ctx->program,
+ ctx->hwctx->device_id,
+ CL_PROGRAM_BUILD_LOG,
+ log_length, log, NULL);
+ if (cle == CL_SUCCESS)
+ av_log(avctx, AV_LOG_ERROR, "Build log:\n%s\n", log);
+ }
+
+ av_free(log);
+ }
+
+ clReleaseProgram(ctx->program);
+ return AVERROR(EIO);
+ }
+
+ return 0;
+}
+
+int ff_opencl_filter_load_program(AVFilterContext *avctx,
+ const char **program_source_array,
+ int nb_strings)
+{
+ return opencl_filter_load_program(avctx, program_source_array,
+ nb_strings);
+}
+
+int ff_opencl_filter_load_program_from_file(AVFilterContext *avctx,
+ const char *filename)
+{
+ FILE *file;
+ char *src = NULL;
+ size_t pos, len, rb;
+ const char *src_const;
+ int err;
+
+ file = fopen(filename, "r");
+ if (!file) {
+ av_log(avctx, AV_LOG_ERROR, "Unable to open program "
+ "source file \"%s\".\n", filename);
+ return AVERROR(ENOENT);
+ }
+
+ len = 1 << 16;
+ pos = 0;
+ while (1) {
+ err = av_reallocp(&src, len);
+ if (err < 0)
+ goto fail;
+ rb = fread(src + pos, 1, len - pos - 1, file);
+ if (rb == 0 && ferror(file)) {
+ err = AVERROR(EIO);
+ goto fail;
+ }
+ pos += rb;
+ if (pos < len)
+ break;
+ len <<= 1;
+ }
+ src[pos] = 0;
+
+ src_const = src;
+
+ err = opencl_filter_load_program(avctx, &src_const, 1);
+fail:
+ fclose(file);
+ av_freep(&src);
+ return err;
+}
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 */
--
2.11.0
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