Adds a sunxi-cedrus-drv-video libVA backend

This VA backend uses v4l2's Frame API proposal to interface with the
"sunxi-cedrus" video driver on Allwinner SoC. Only a few parts of the
code are really dependent on sunxi-cedrus and this VA backend could be
reused for other v4l drivers using the Frame API.

src/buffer.c

@@ -0,0 +1,196 @@
+/*
+ * Copyright (c) 2016 Florent Revest, <florent.revest@free-electrons.com>
+ *               2007 Intel Corporation. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "sunxi_cedrus_drv_video.h"
+#include "buffer.h"
+#include "context.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
+#include <linux/videodev2.h>
+
+/*
+ * A Buffer is a memory zone used to handle all kind of data, for example an IQ
+ * matrix or image buffer (which are allocated using realloc) or slice data
+ * (which are mmapped from v4l's kernel space)
+ */
+
+VAStatus sunxi_cedrus_CreateBuffer(VADriverContextP ctx, VAContextID context,
+		VABufferType type, unsigned int size, unsigned int num_elements,
+		void *data, VABufferID *buf_id)
+{
+	INIT_DRIVER_DATA
+	VAStatus vaStatus = VA_STATUS_SUCCESS;
+	int bufferID;
+	struct v4l2_plane plane[1];
+	object_buffer_p obj_buffer;
+
+	/* Validate type */
+	switch (type)
+	{
+		case VAPictureParameterBufferType:
+		case VAIQMatrixBufferType: /* Ignored */
+		case VASliceParameterBufferType:
+		case VASliceDataBufferType:
+		case VAImageBufferType:
+			/* Ok */
+			break;
+		default:
+			vaStatus = VA_STATUS_ERROR_UNSUPPORTED_BUFFERTYPE;
+			return vaStatus;
+	}
+
+	bufferID = object_heap_allocate(&driver_data->buffer_heap);
+	obj_buffer = BUFFER(bufferID);
+	if (NULL == obj_buffer)
+	{
+		vaStatus = VA_STATUS_ERROR_ALLOCATION_FAILED;
+		return vaStatus;
+	}
+
+	obj_buffer->buffer_data = NULL;
+	obj_buffer->type = type;
+
+	if(obj_buffer->type == VASliceDataBufferType) {
+		object_context_p obj_context;
+
+		obj_context = CONTEXT(context);
+		assert(obj_context);
+
+		struct v4l2_buffer buf;
+		memset(&(buf), 0, sizeof(buf));
+		buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+		buf.memory = V4L2_MEMORY_MMAP;
+		buf.index = obj_context->num_rendered_surfaces%INPUT_BUFFERS_NB;
+		buf.length = 1;
+		buf.m.planes = plane;
+
+		assert(ioctl(driver_data->mem2mem_fd, VIDIOC_QUERYBUF, &buf)==0);
+
+		obj_buffer->buffer_data = mmap(NULL, size * num_elements,
+				PROT_READ | PROT_WRITE, MAP_SHARED,
+				driver_data->mem2mem_fd, buf.m.planes[0].m.mem_offset);
+	} else
+		obj_buffer->buffer_data = realloc(obj_buffer->buffer_data, size * num_elements);
+
+	if (obj_buffer->buffer_data == NULL)
+		return VA_STATUS_ERROR_ALLOCATION_FAILED;
+
+	if (VA_STATUS_SUCCESS == vaStatus)
+	{
+		obj_buffer->max_num_elements = num_elements;
+		obj_buffer->num_elements = num_elements;
+		obj_buffer->size = size;
+
+		if (data)
+			memcpy(obj_buffer->buffer_data, data,
+					size * num_elements);
+	}
+
+	if (VA_STATUS_SUCCESS == vaStatus)
+		*buf_id = bufferID;
+
+	return vaStatus;
+}
+
+VAStatus sunxi_cedrus_BufferSetNumElements(VADriverContextP ctx,
+		VABufferID buf_id, unsigned int num_elements)
+{
+	INIT_DRIVER_DATA
+	VAStatus vaStatus = VA_STATUS_SUCCESS;
+	object_buffer_p obj_buffer = BUFFER(buf_id);
+	assert(obj_buffer);
+
+	if ((num_elements < 0) || (num_elements > obj_buffer->max_num_elements))
+		vaStatus = VA_STATUS_ERROR_UNKNOWN;
+	if (VA_STATUS_SUCCESS == vaStatus)
+		obj_buffer->num_elements = num_elements;
+
+	return vaStatus;
+}
+
+VAStatus sunxi_cedrus_MapBuffer(VADriverContextP ctx, VABufferID buf_id,
+		void **pbuf)
+{
+	INIT_DRIVER_DATA
+	VAStatus vaStatus = VA_STATUS_ERROR_UNKNOWN;
+	object_buffer_p obj_buffer = BUFFER(buf_id);
+	assert(obj_buffer);
+	if (NULL == obj_buffer)
+	{
+		vaStatus = VA_STATUS_ERROR_INVALID_BUFFER;
+		return vaStatus;
+	}
+
+	if (NULL != obj_buffer->buffer_data)
+	{
+		*pbuf = obj_buffer->buffer_data;
+		vaStatus = VA_STATUS_SUCCESS;
+	}
+	return vaStatus;
+}
+
+VAStatus sunxi_cedrus_UnmapBuffer(VADriverContextP ctx, VABufferID buf_id)
+{
+	/* Do nothing */
+	return VA_STATUS_SUCCESS;
+}
+
+void sunxi_cedrus_destroy_buffer(struct sunxi_cedrus_driver_data *driver_data,
+		object_buffer_p obj_buffer)
+{
+	if (NULL != obj_buffer->buffer_data)
+	{
+		if(obj_buffer->type == VASliceDataBufferType)
+			munmap(obj_buffer->buffer_data, obj_buffer->size);
+		else
+			free(obj_buffer->buffer_data);
+
+		obj_buffer->buffer_data = NULL;
+	}
+
+	object_heap_free(&driver_data->buffer_heap, (object_base_p) obj_buffer);
+}
+
+VAStatus sunxi_cedrus_DestroyBuffer(VADriverContextP ctx, VABufferID buffer_id)
+{
+	INIT_DRIVER_DATA
+	object_buffer_p obj_buffer = BUFFER(buffer_id);
+	assert(obj_buffer);
+
+	sunxi_cedrus_destroy_buffer(driver_data, obj_buffer);
+	return VA_STATUS_SUCCESS;
+}
+
+/* sunxi-cedrus doesn't support buffer info */
+VAStatus sunxi_cedrus_BufferInfo(VADriverContextP ctx, VABufferID buf_id,
+		VABufferType *type, unsigned int *size,
+		unsigned int *num_elements)
+{ return VA_STATUS_ERROR_UNIMPLEMENTED; }