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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <memory>
#include <span>
#include <string>
#include <string_view>
#include <vector>
#include "common/common_types.h"
namespace FFmpeg {
class Frame;
}
namespace Tegra::Host1x {
/// A picture decoded by Nx2VideoDecoder, in display order.
struct Nx2Picture {
u32 width{};
u32 height{};
u64 pts{}; ///< As submitted with the compressed frame
std::shared_ptr<FFmpeg::Frame> frame;
};
/// Pixel layouts of a Switch 2 decoder output image.
enum class Nx2PictureFormat : u32 {
Nv12, ///< Luma rows, then interleaved Cb/Cr rows at chroma_offset
Rgba8,
Bgra8,
};
/// Checks if stream data begins with an H.264 Annex-B start code or avcC/MP4 length-prefixed NALUs.
bool IsH264Stream(std::span<const u8> data);
/// The decoder behind the Switch 2 video decoder service (nn::codec::video): FFmpeg decodes the
/// elementary stream the game demuxed, in software or on the host GPU (NVDEC emulation setting).
/// Used from one thread at a time.
class Nx2VideoDecoder {
public:
/// mime: the codec name nn::codec sends with Configure ("video/vp9", "video/vp8", ...).
explicit Nx2VideoDecoder(std::string_view mime);
~Nx2VideoDecoder();
bool IsOpen() const;
const std::string& Name() const;
/// Decodes one compressed frame and appends the pictures it completes.
void Decode(std::span<const u8> data, u64 pts, std::vector<Nx2Picture>& pictures);
/// End of stream: appends the pictures the decoder still holds, then starts over.
void Drain(std::vector<Nx2Picture>& pictures);
/// Drops everything queued in the decoder (the game flushed it to seek).
void Reset();
/// Converts a picture to `format` in `out`: rows `pitch` bytes apart, NV12's chroma plane at
/// `chroma_offset`, scaled to width x height.
void Render(const Nx2Picture& picture, Nx2PictureFormat format, u32 width, u32 height,
u64 pitch, u64 chroma_offset, std::span<u8> out);
private:
struct Impl;
std::unique_ptr<Impl> impl;
};
} // namespace Tegra::Host1x
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