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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include <string>
#include <utility>
#include <vector>
#include "base/macros.h"
#include "media/base/media_export.h"
#include "media/base/video_types.h"
#include "ui/gfx/geometry/size.h"
namespace media {
// A class to describes how physical buffer is allocated for video frame.
// In stores format, coded size of the frame and size of physical buffers
// which can be used to allocate buffer(s) hardware expected.
// Also, it stores stride (bytes per line) per color plane to calculate each
// color plane's size (note that a buffer may contains multiple color planes.)
class MEDIA_EXPORT VideoFrameLayout {
// Constructor with strides and buffers' size.
// If strides and buffer_sizes are not assigned, their default value are
// {0, 0, 0, 0} for compatibility with's original behavior.
VideoFrameLayout(VideoPixelFormat format,
const gfx::Size& coded_size,
std::vector<int32_t> strides = {0, 0, 0, 0},
std::vector<size_t> buffer_sizes = {0, 0, 0, 0});
// Move constructor.
VideoPixelFormat format() const { return format_; }
const gfx::Size& coded_size() const { return coded_size_; }
// Return number of buffers. Note that num_strides >= num_buffers.
size_t num_buffers() const { return buffer_sizes_.size(); }
// Returns number of strides. Note that num_strides >= num_buffers.
size_t num_strides() const { return strides_.size(); }
const std::vector<int32_t>& strides() const { return strides_; }
const std::vector<size_t>& buffer_sizes() const { return buffer_sizes_; }
// Sets strides.
void set_strides(std::vector<int32_t> strides) {
strides_ = std::move(strides);
// Sets buffer_sizes.
void set_buffer_sizes(std::vector<size_t> buffer_sizes) {
buffer_sizes_ = std::move(buffer_sizes);
// Clones this as a explicitly copy constructor.
VideoFrameLayout Clone() const;
// Returns sum of bytes of all buffers.
size_t GetTotalBufferSize() const;
// Composes VideoFrameLayout as human readable string.
std::string ToString() const;
const VideoPixelFormat format_;
// Width and height of the video frame in pixels. This must include pixel
// data for the whole image; i.e. for YUV formats with subsampled chroma
// planes, in the case that the visible portion of the image does not line up
// on a sample boundary, |coded_size_| must be rounded up appropriately and
// the pixel data provided for the odd pixels.
const gfx::Size coded_size_;
// Vector of strides for each buffer, typically greater or equal to the
// width of the surface divided by the horizontal sampling period. Note that
// strides can be negative if the image layout is bottom-up.
std::vector<int32_t> strides_;
// Vector of sizes for each buffer, typically greater or equal to the area of
// |coded_size_|.
std::vector<size_t> buffer_sizes_;
} // namespace media