/*
 * GStreamer gstreamer-tensor
 * Copyright (C) 2024 Collabora Ltd
 *
 * gsttensor.h
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifndef __GST_TENSOR_H__
#define __GST_TENSOR_H__

#include <gst/gst.h>
#include <gst/analytics/analytics-meta-prelude.h>

/**
 * GstTensorDataType:
 * @GST_TENSOR_DATA_TYPE_INT4: signed 4 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_INT8: signed 8 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_INT16: signed 16 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_INT32: signed 32 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_INT64: signed 64 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_UINT4: unsigned 4 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_UINT8: unsigned 8 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_UINT16: unsigned 16 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_UINT32: unsigned 32 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_UINT64: unsigned 64 bit integer tensor data
 * @GST_TENSOR_DATA_TYPE_FLOAT16: 16 bit floating point tensor data
 * @GST_TENSOR_DATA_TYPE_FLOAT32: 32 bit floating point tensor data
 * @GST_TENSOR_DATA_TYPE_FLOAT64: 64 bit floating point tensor data
 * @GST_TENSOR_DATA_TYPE_BFLOAT16: "brain" 16 bit floating point tensor data
 *
 * Describe the type of data contain in the tensor.
 *
 * Since: 1.26
 */
typedef enum _GstTensorDataType
{
  GST_TENSOR_DATA_TYPE_INT4,
  GST_TENSOR_DATA_TYPE_INT8,
  GST_TENSOR_DATA_TYPE_INT16,
  GST_TENSOR_DATA_TYPE_INT32,
  GST_TENSOR_DATA_TYPE_INT64,
  GST_TENSOR_DATA_TYPE_UINT4,
  GST_TENSOR_DATA_TYPE_UINT8,
  GST_TENSOR_DATA_TYPE_UINT16,
  GST_TENSOR_DATA_TYPE_UINT32,
  GST_TENSOR_DATA_TYPE_UINT64,
  GST_TENSOR_DATA_TYPE_FLOAT16,
  GST_TENSOR_DATA_TYPE_FLOAT32,
  GST_TENSOR_DATA_TYPE_FLOAT64,
  GST_TENSOR_DATA_TYPE_BFLOAT16
} GstTensorDataType;

/**
 * GstTensorDimOrder:
 * @GST_TENSOR_DIM_ORDER_ROW_MAJOR: elements along a row are consecutive in memory
 * @GST_TENSOR_DIM_ORDER_COL_MAJOR: elements along a column are consecutive in memory
 * @GST_TENSOR_DIM_ORDER_INDEXED: elements storage follow the order defined by
 *    #GstTensorDim.order_index This mean that when iterating the tensor
 *    the dimension with index 0 is the most nested in the loops and consecutive
 *    in memory, followed by other dimensions in the order defined by
 *    #GstTensorDim.order_index.
 *
 * Indicate to read tensor from memory in row-major or column-major order.
 *
 * Since: 1.26
 */
typedef enum _GstTensorDimOrder
{
  GST_TENSOR_DIM_ORDER_ROW_MAJOR,
  GST_TENSOR_DIM_ORDER_COL_MAJOR,
  GST_TENSOR_DIM_ORDER_INDEXED
} GstTensorDimOrder;

/**
 * GstTensorLayout:
 * @GST_TENSOR_LAYOUT_STRIDED: indicate the tensor is stored in a dense format in memory
 *
 * Indicate tensor storage in memory.
 *
 * Since: 1.26
 */
typedef enum _GstTensorLayout
{
  GST_TENSOR_LAYOUT_STRIDED
} GstTensorLayout;


/**
 * GstTensorDim:
 * @size: Size of the dimension
 * @order_index: Dimension order in memory. @see_also #GST_TENSOR_DIM_ORDER_INDEXED
 *
 * Hold properties of the tensor's dimension
 *
 * Since: 1.26
 */
typedef struct _GstTensorDim
{
  gsize size;
  gsize order_index;
} GstTensorDim;

/**
 * GstTensor:
 * @id: semantically identify the contents of the tensor
 * @layout: Indicate tensor layout
 * @data_type: #GstTensorDataType of tensor data
 * @batch_size: Model batch size
 * @data: #GstBuffer holding tensor data
 * @dims_order: Indicate tensor elements layout in memory.
 * @num_dims: number of tensor dimensions
 * @dims: (array length=num_dims): number of tensor dimensions
 *
 * Hold tensor data
 *
 * Since: 1.26
 */
typedef struct _GstTensor
{
  GQuark id;
  GstTensorLayout layout;
  GstTensorDataType data_type;
  gsize batch_size;
  GstBuffer *data;
  GstTensorDimOrder dims_order;
  gsize num_dims;
  GstTensorDim dims[];
} GstTensor;

G_BEGIN_DECLS

#define GST_TYPE_TENSOR (gst_tensor_get_type())

GST_ANALYTICS_META_API
GstTensor * gst_tensor_alloc (gsize num_dims);

GST_ANALYTICS_META_API
GstTensor * gst_tensor_new_simple (GQuark id,
    GstTensorDataType data_type,
    gsize batch_size,
    GstBuffer * data,
    GstTensorDimOrder dims_order,
    gsize num_dims,
    gsize * dims);

GST_ANALYTICS_META_API
void gst_tensor_free (GstTensor * tensor);

GST_ANALYTICS_META_API
GstTensor * gst_tensor_copy (const GstTensor * tensor);

GST_ANALYTICS_META_API
GstTensorDim * gst_tensor_get_dims (GstTensor * tensor, gsize * num_dims);

GST_ANALYTICS_META_API
GType gst_tensor_get_type (void);

G_END_DECLS

#endif /* __GST_TENSOR_H__ */