#include <algorithm>
#include <array>
#include <cstdint>
#include <cstdio>
#include <stdexcept>
#include <string>
#include <vector>
#include "prx/libc/include/General.hpp"

struct DecoderConfigInfo {
    std::uint64_t thisSize;
    std::uint32_t resourceType;
    std::uint32_t codecType;
    std::uint32_t profile;
    std::uint32_t maxLevel;
    std::int32_t maxFrameWidth;
    std::int32_t maxFrameHeight;
    std::int32_t maxDpbFrameCount;
    std::uint32_t decodePipelineDepth;
};

struct DecoderMemoryInfo {
    std::uint64_t thisSize;
    std::uint64_t cpuMemorySize;
    void* cpuMemory;
    std::uint64_t gpuMemorySize;
    void* gpuMemory;
    std::uint64_t cpuGpuMemorySize;
    void* cpuGpuMemory;
    std::uint64_t maxFrameBufferSize;
    std::uint32_t frameBufferAlignment;
};

struct InputData {
    std::uint64_t thisSize;
    const std::uint8_t* auData;
    std::uint64_t auSize;
    std::uint64_t ptsData;
    std::uint64_t dtsData;
    std::uint64_t attachedData;
};

struct FrameBuffer {
    std::uint64_t thisSize;
    void* frameBuffer;
    std::uint64_t frameBufferSize;
    bool isAccepted;
};

struct OutputInfo {
    std::uint64_t thisSize;
    bool isValid;
    bool isErrorFrame;
    std::uint8_t pictureCount;
    std::uint32_t codecType;
    std::uint32_t frameWidth;
    std::uint32_t framePitch;
    std::uint32_t frameHeight;
    void* frameBuffer;
    std::uint64_t frameBufferSize;
    std::uint32_t frameFormat;
    std::uint32_t framePitchInBytes;
};

struct AvcPictureInfo {
    std::uint64_t thisSize;
    bool isValid;
    std::uint64_t ptsData;
    std::uint64_t dtsData;
    std::uint64_t attachedData;
    std::uint8_t idrPictureFlag;
    std::uint8_t profileIdc;
    std::uint8_t levelIdc;
    std::uint32_t picWidthInLumaSamples;
    std::uint32_t picHeightInLumaSamples;
};

extern "C" {
int APS5_VABI sceVideodec2QueryDecoderMemoryInfo_nid_postfix(const DecoderConfigInfo*, DecoderMemoryInfo*);
int APS5_VABI sceVideodec2CreateDecoder_nid_postfix(const DecoderConfigInfo*, const DecoderMemoryInfo*, std::uint64_t*);
int APS5_VABI sceVideodec2DeleteDecoder_nid_postfix(std::uint64_t);
int APS5_VABI sceVideodec2Decode_nid_postfix(std::uint64_t, const InputData*, FrameBuffer*, OutputInfo*);
int APS5_VABI sceVideodec2Flush_nid_postfix(std::uint64_t, FrameBuffer*, OutputInfo*);
int APS5_VABI sceVideodec2Reset_nid_postfix(std::uint64_t);
int APS5_VABI sceVideodec2GetPictureInfo_nid_postfix(const OutputInfo*, AvcPictureInfo*, void*);
int APS5_VABI sceVideodec2GetAvcPictureInfo_nid_postfix(const OutputInfo*, AvcPictureInfo*, AvcPictureInfo*);
}

namespace {

constexpr std::uint32_t Width = 64;
constexpr std::uint32_t Height = 40;

constexpr std::array<std::uint8_t, 1477> Stream{
    0x00, 0x00, 0x00, 0x01, 0x09, 0x10, 0x00, 0x00, 0x00, 0x01, 0x67, 0x64, 0x00, 0x0a, 0xac, 0xd9,
    0x44, 0x7f, 0x97, 0x01, 0x10, 0x00, 0x00, 0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x03, 0xc0, 0xf1,
    0x22, 0x59, 0x60, 0x00, 0x00, 0x00, 0x01, 0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0, 0x00, 0x00, 0x01,
    0x06, 0x05, 0xff, 0xff, 0xa5, 0xdc, 0x45, 0xe9, 0xbd, 0xe6, 0xd9, 0x48, 0xb7, 0x96, 0x2c, 0xd8,
    0x20, 0xd9, 0x23, 0xee, 0xef, 0x78, 0x32, 0x36, 0x34, 0x20, 0x2d, 0x20, 0x63, 0x6f, 0x72, 0x65,
    0x20, 0x31, 0x36, 0x35, 0x20, 0x72, 0x33, 0x32, 0x32, 0x32, 0x20, 0x62, 0x33, 0x35, 0x36, 0x30,
    0x35, 0x61, 0x20, 0x2d, 0x20, 0x48, 0x2e, 0x32, 0x36, 0x34, 0x2f, 0x4d, 0x50, 0x45, 0x47, 0x2d,
    0x34, 0x20, 0x41, 0x56, 0x43, 0x20, 0x63, 0x6f, 0x64, 0x65, 0x63, 0x20, 0x2d, 0x20, 0x43, 0x6f,
    0x70, 0x79, 0x6c, 0x65, 0x66, 0x74, 0x20, 0x32, 0x30, 0x30, 0x33, 0x2d, 0x32, 0x30, 0x32, 0x35,
    0x20, 0x2d, 0x20, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x76, 0x69,
    0x64, 0x65, 0x6f, 0x6c, 0x61, 0x6e, 0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x78, 0x32, 0x36, 0x34, 0x2e,
    0x68, 0x74, 0x6d, 0x6c, 0x20, 0x2d, 0x20, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x3a, 0x20,
    0x63, 0x61, 0x62, 0x61, 0x63, 0x3d, 0x31, 0x20, 0x72, 0x65, 0x66, 0x3d, 0x33, 0x20, 0x64, 0x65,
    0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x3d, 0x31, 0x3a, 0x30, 0x3a, 0x30, 0x20, 0x61, 0x6e, 0x61, 0x6c,
    0x79, 0x73, 0x65, 0x3d, 0x30, 0x78, 0x33, 0x3a, 0x30, 0x78, 0x31, 0x31, 0x33, 0x20, 0x6d, 0x65,
    0x3d, 0x68, 0x65, 0x78, 0x20, 0x73, 0x75, 0x62, 0x6d, 0x65, 0x3d, 0x37, 0x20, 0x70, 0x73, 0x79,
    0x3d, 0x31, 0x20, 0x70, 0x73, 0x79, 0x5f, 0x72, 0x64, 0x3d, 0x31, 0x2e, 0x30, 0x30, 0x3a, 0x30,
    0x2e, 0x30, 0x30, 0x20, 0x6d, 0x69, 0x78, 0x65, 0x64, 0x5f, 0x72, 0x65, 0x66, 0x3d, 0x31, 0x20,
    0x6d, 0x65, 0x5f, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x3d, 0x31, 0x36, 0x20, 0x63, 0x68, 0x72, 0x6f,
    0x6d, 0x61, 0x5f, 0x6d, 0x65, 0x3d, 0x31, 0x20, 0x74, 0x72, 0x65, 0x6c, 0x6c, 0x69, 0x73, 0x3d,
    0x31, 0x20, 0x38, 0x78, 0x38, 0x64, 0x63, 0x74, 0x3d, 0x31, 0x20, 0x63, 0x71, 0x6d, 0x3d, 0x30,
    0x20, 0x64, 0x65, 0x61, 0x64, 0x7a, 0x6f, 0x6e, 0x65, 0x3d, 0x32, 0x31, 0x2c, 0x31, 0x31, 0x20,
    0x66, 0x61, 0x73, 0x74, 0x5f, 0x70, 0x73, 0x6b, 0x69, 0x70, 0x3d, 0x31, 0x20, 0x63, 0x68, 0x72,
    0x6f, 0x6d, 0x61, 0x5f, 0x71, 0x70, 0x5f, 0x6f, 0x66, 0x66, 0x73, 0x65, 0x74, 0x3d, 0x2d, 0x32,
    0x20, 0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x73, 0x3d, 0x31, 0x20, 0x6c, 0x6f, 0x6f, 0x6b, 0x61,
    0x68, 0x65, 0x61, 0x64, 0x5f, 0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x73, 0x3d, 0x31, 0x20, 0x73,
    0x6c, 0x69, 0x63, 0x65, 0x64, 0x5f, 0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x73, 0x3d, 0x30, 0x20,
    0x6e, 0x72, 0x3d, 0x30, 0x20, 0x64, 0x65, 0x63, 0x69, 0x6d, 0x61, 0x74, 0x65, 0x3d, 0x31, 0x20,
    0x69, 0x6e, 0x74, 0x65, 0x72, 0x6c, 0x61, 0x63, 0x65, 0x64, 0x3d, 0x30, 0x20, 0x62, 0x6c, 0x75,
    0x72, 0x61, 0x79, 0x5f, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x74, 0x3d, 0x30, 0x20, 0x63, 0x6f, 0x6e,
    0x73, 0x74, 0x72, 0x61, 0x69, 0x6e, 0x65, 0x64, 0x5f, 0x69, 0x6e, 0x74, 0x72, 0x61, 0x3d, 0x30,
    0x20, 0x62, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x73, 0x3d, 0x32, 0x20, 0x62, 0x5f, 0x70, 0x79, 0x72,
    0x61, 0x6d, 0x69, 0x64, 0x3d, 0x32, 0x20, 0x62, 0x5f, 0x61, 0x64, 0x61, 0x70, 0x74, 0x3d, 0x30,
    0x20, 0x62, 0x5f, 0x62, 0x69, 0x61, 0x73, 0x3d, 0x30, 0x20, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74,
    0x3d, 0x31, 0x20, 0x77, 0x65, 0x69, 0x67, 0x68, 0x74, 0x62, 0x3d, 0x31, 0x20, 0x6f, 0x70, 0x65,
    0x6e, 0x5f, 0x67, 0x6f, 0x70, 0x3d, 0x30, 0x20, 0x77, 0x65, 0x69, 0x67, 0x68, 0x74, 0x70, 0x3d,
    0x32, 0x20, 0x6b, 0x65, 0x79, 0x69, 0x6e, 0x74, 0x3d, 0x36, 0x20, 0x6b, 0x65, 0x79, 0x69, 0x6e,
    0x74, 0x5f, 0x6d, 0x69, 0x6e, 0x3d, 0x31, 0x20, 0x73, 0x63, 0x65, 0x6e, 0x65, 0x63, 0x75, 0x74,
    0x3d, 0x30, 0x20, 0x69, 0x6e, 0x74, 0x72, 0x61, 0x5f, 0x72, 0x65, 0x66, 0x72, 0x65, 0x73, 0x68,
    0x3d, 0x30, 0x20, 0x72, 0x63, 0x5f, 0x6c, 0x6f, 0x6f, 0x6b, 0x61, 0x68, 0x65, 0x61, 0x64, 0x3d,
    0x36, 0x20, 0x72, 0x63, 0x3d, 0x63, 0x72, 0x66, 0x20, 0x6d, 0x62, 0x74, 0x72, 0x65, 0x65, 0x3d,
    0x31, 0x20, 0x63, 0x72, 0x66, 0x3d, 0x32, 0x33, 0x2e, 0x30, 0x20, 0x71, 0x63, 0x6f, 0x6d, 0x70,
    0x3d, 0x30, 0x2e, 0x36, 0x30, 0x20, 0x71, 0x70, 0x6d, 0x69, 0x6e, 0x3d, 0x30, 0x20, 0x71, 0x70,
    0x6d, 0x61, 0x78, 0x3d, 0x36, 0x39, 0x20, 0x71, 0x70, 0x73, 0x74, 0x65, 0x70, 0x3d, 0x34, 0x20,
    0x69, 0x70, 0x5f, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x3d, 0x31, 0x2e, 0x34, 0x30, 0x20, 0x61, 0x71,
    0x3d, 0x31, 0x3a, 0x31, 0x2e, 0x30, 0x30, 0x00, 0x80, 0x00, 0x00, 0x01, 0x65, 0x88, 0x84, 0x00,
    0x21, 0xff, 0x5b, 0xff, 0x78, 0x50, 0x63, 0x8c, 0x32, 0x61, 0x08, 0xb9, 0xb3, 0xab, 0x26, 0xb5,
    0xe1, 0xe9, 0x5b, 0xb7, 0x7b, 0xfd, 0x6b, 0x41, 0x3a, 0x52, 0x12, 0x59, 0x95, 0x0c, 0xa4, 0x3b,
    0xc7, 0x28, 0x9a, 0x87, 0xd9, 0x38, 0xc9, 0xcb, 0x8f, 0x05, 0x47, 0xff, 0xd1, 0x1e, 0xd3, 0x68,
    0xb5, 0x05, 0x8c, 0xb4, 0xf3, 0x18, 0x74, 0x33, 0x57, 0x68, 0xf6, 0xf0, 0xc7, 0xcb, 0xbf, 0x7b,
    0x3d, 0x43, 0x0f, 0xa7, 0x42, 0x5a, 0x78, 0x5b, 0x61, 0x0e, 0xc6, 0x5c, 0xb2, 0xdf, 0xa0, 0xe0,
    0x96, 0x11, 0xdd, 0x02, 0xec, 0x17, 0x80, 0x72, 0x4f, 0x35, 0x05, 0x1e, 0x8b, 0xa8, 0xfc, 0x38,
    0x28, 0xa8, 0xc7, 0x19, 0x5a, 0xa0, 0x8b, 0x96, 0x47, 0x6c, 0xf3, 0x37, 0x65, 0x02, 0x13, 0x8a,
    0x97, 0xbc, 0x86, 0xf8, 0x31, 0xc2, 0xab, 0x7f, 0xe1, 0xa4, 0x68, 0x21, 0xc5, 0xe1, 0x56, 0xca,
    0x96, 0xd7, 0xa3, 0x7f, 0x77, 0x7b, 0xed, 0x28, 0x08, 0xd4, 0xe3, 0x98, 0xdc, 0xc1, 0x2f, 0x0f,
    0x0c, 0x37, 0x06, 0x36, 0xd4, 0x10, 0xdb, 0x7e, 0x99, 0xd4, 0xb1, 0x67, 0xda, 0xbd, 0x28, 0x58,
    0xe6, 0x0e, 0x70, 0x33, 0xe4, 0xb0, 0xb8, 0xd2, 0xb4, 0x60, 0x16, 0x41, 0x1d, 0xda, 0xc5, 0x47,
    0xad, 0xd3, 0x55, 0x30, 0xdf, 0xca, 0xab, 0xb9, 0x91, 0xca, 0xca, 0xe6, 0xfe, 0xb4, 0x9e, 0x55,
    0x18, 0xeb, 0x74, 0x83, 0x01, 0x95, 0xb3, 0x0c, 0x92, 0x4d, 0xb8, 0xfd, 0xa6, 0x28, 0x77, 0xdb,
    0xb9, 0xbc, 0xf2, 0x2c, 0xde, 0xe2, 0x1f, 0x55, 0x39, 0x80, 0x05, 0x67, 0xf1, 0x8c, 0x46, 0xf3,
    0xf8, 0x61, 0x00, 0x00, 0x00, 0x01, 0x09, 0x30, 0x00, 0x00, 0x01, 0x41, 0x9a, 0x23, 0x6c, 0x47,
    0x7f, 0xd6, 0x70, 0xed, 0x07, 0x2d, 0x6f, 0xf0, 0xd9, 0x1c, 0xc5, 0x57, 0x33, 0x9c, 0x0b, 0xe3,
    0x29, 0x4d, 0xc8, 0x18, 0xba, 0x21, 0x49, 0x77, 0xb9, 0xc5, 0x9c, 0xab, 0xcb, 0xca, 0xe9, 0xab,
    0xf7, 0xad, 0xfb, 0x45, 0xda, 0x68, 0x98, 0x7e, 0xff, 0xbd, 0x7e, 0x91, 0xb8, 0x93, 0xb5, 0x78,
    0x93, 0x98, 0x6e, 0x6e, 0xdf, 0x1f, 0x8f, 0x3c, 0x4e, 0xc9, 0x78, 0x17, 0xbf, 0xf4, 0xfb, 0x47,
    0x64, 0x2f, 0xb3, 0xf8, 0xb6, 0xdc, 0x1a, 0xe9, 0xb7, 0x7c, 0xfc, 0x6a, 0x5d, 0xb5, 0x95, 0xb6,
    0x47, 0x6b, 0xfe, 0x5d, 0xf6, 0x8e, 0x6e, 0x85, 0x65, 0x2a, 0x2d, 0x05, 0x21, 0x45, 0x13, 0x0d,
    0x0c, 0xf3, 0xea, 0x6f, 0x58, 0x28, 0x7a, 0x66, 0x54, 0xfd, 0x7e, 0x27, 0xc6, 0x6a, 0xf0, 0x00,
    0x00, 0x00, 0x01, 0x09, 0x50, 0x00, 0x00, 0x01, 0x41, 0x9e, 0x41, 0x78, 0x84, 0x3f, 0xe3, 0x5a,
    0x3c, 0x1e, 0x34, 0x44, 0x68, 0x14, 0xb9, 0xbc, 0x32, 0x4a, 0xc3, 0x1b, 0x54, 0xd4, 0x00, 0x3c,
    0x17, 0xa1, 0xbd, 0xc0, 0x86, 0xe1, 0xbf, 0x7d, 0xf4, 0x08, 0x3c, 0xa3, 0xeb, 0xe0, 0xfd, 0x44,
    0x09, 0x7d, 0x95, 0x20, 0xf4, 0x50, 0x4b, 0x4e, 0xf3, 0x78, 0xa5, 0x9f, 0x14, 0x23, 0x7f, 0xc1,
    0x4e, 0x94, 0xf1, 0x1b, 0xa1, 0x94, 0x86, 0x6d, 0x14, 0x53, 0xa8, 0xe6, 0xa4, 0xd4, 0x28, 0xcd,
    0x86, 0xb1, 0xcb, 0x9f, 0x67, 0x72, 0xc5, 0xf8, 0x99, 0x9a, 0xf3, 0xba, 0x47, 0xdf, 0x41, 0x00,
    0x00, 0x00, 0x01, 0x09, 0x50, 0x00, 0x00, 0x01, 0x01, 0x9e, 0x62, 0x6a, 0x42, 0x5f, 0xdf, 0xac,
    0xe9, 0x76, 0x6c, 0x13, 0x5c, 0xa1, 0x08, 0xbf, 0xd4, 0xd8, 0x03, 0xef, 0xd2, 0x0d, 0xc1, 0xde,
    0x35, 0x3b, 0x9e, 0x3d, 0xe1, 0xf6, 0xd8, 0xe7, 0xae, 0xdf, 0x9f, 0x20, 0x19, 0xbc, 0x50, 0xa9,
    0x69, 0x82, 0x26, 0x04, 0xaf, 0x83, 0x44, 0x79, 0x1b, 0x74, 0x18, 0x2b, 0x00, 0xb8, 0x62, 0xa3,
    0xd1, 0x84, 0x8b, 0x61, 0x87, 0x1a, 0x4f, 0x5b, 0xef, 0x16, 0xeb, 0xb3, 0x1a, 0x06, 0xfd, 0x92,
    0x87, 0x06, 0xc3, 0xec, 0xda, 0xde, 0xec, 0x3d, 0x7d, 0x8a, 0x06, 0x91, 0xc8, 0xdf, 0x59, 0xa7,
    0x58, 0xef, 0x7a, 0x3c, 0x27, 0x1d, 0x00, 0x00, 0x00, 0x01, 0x09, 0x30, 0x00, 0x00, 0x01, 0x41,
    0x9a, 0x65, 0x49, 0xa8, 0x41, 0x68, 0x99, 0x4c, 0x14, 0xf0, 0xc7, 0xde, 0x88, 0x44, 0x37, 0xa7,
    0x7f, 0x10, 0x1e, 0xf9, 0x41, 0xb5, 0x7c, 0x9b, 0xf7, 0x1d, 0x61, 0x0e, 0xe1, 0xec, 0xbc, 0x75,
    0x08, 0x53, 0x8f, 0x68, 0x84, 0x84, 0x93, 0x11, 0x08, 0xf6, 0xb2, 0xe5, 0x6f, 0x30, 0x16, 0xd0,
    0x9d, 0xf2, 0x87, 0x44, 0x40, 0x82, 0x85, 0xcf, 0x16, 0x73, 0x64, 0x1f, 0xb0, 0x22, 0x75, 0xc8,
    0xd7, 0xd2, 0x61, 0xdc, 0x1e, 0x9c, 0xa0, 0xeb, 0x88, 0x7d, 0x1a, 0x55, 0xe4, 0x66, 0x49, 0x5e,
    0xa8, 0xff, 0xc2, 0xb5, 0xb0, 0x46, 0x2a, 0xb5, 0xcd, 0xed, 0x7c, 0xf9, 0xd8, 0xe7, 0x00, 0x00,
    0x00, 0x01, 0x09, 0x50, 0x00, 0x00, 0x01, 0x01, 0x9e, 0x84, 0x6a, 0x42, 0x5f, 0xf9, 0x0f, 0xf0,
    0x52, 0xca, 0xb7, 0x04, 0x3a, 0xd3, 0x0a, 0xb3, 0xaa, 0x47, 0xf0, 0x8c, 0x9f, 0x4b, 0x6f, 0x0e,
    0x38, 0x62, 0x53, 0x04, 0x7d, 0x8f, 0x80, 0xca, 0x62, 0x93, 0xfd, 0xbb, 0x97, 0xef, 0x71, 0xf8,
    0xbc, 0x20, 0x23, 0xd1, 0x9d, 0x50, 0xee, 0xd4, 0x9a, 0x13, 0xb6, 0xfb, 0x78, 0x71, 0x43, 0x78,
    0x65, 0xd6, 0x24, 0xe4, 0xca, 0x6f, 0xb4, 0x42, 0x4d, 0x64, 0xd5, 0xfc, 0x12, 0x29, 0x20, 0x52,
    0xd8, 0x82, 0x78, 0x3d, 0x2f,
};

constexpr std::array<std::uint64_t, 6> PictureHashes{
    0x5871fdc85dfa274eull, 0x26ce4afb974cffc4ull, 0xd2e739633733d5baull,
    0x54feb3d290e028fdull, 0xfa1342a4ba1819c8ull, 0x870125dd7f079a4cull,
};

constexpr std::array<std::uint64_t, 6> DisplayOrderUnits{0, 2, 3, 1, 5, 4};

void check(bool condition, const std::string& message) {
    if (!condition) throw std::runtime_error(message);
}

std::uint64_t hashNv12(const std::uint8_t* buffer, std::uint32_t pitch) {
    std::uint64_t hash = 0xcbf29ce484222325ull;
    const auto mix = [&](const std::uint8_t* row) {
        for (std::uint32_t column = 0; column < Width; ++column) hash = (hash ^ row[column]) * 0x100000001b3ull;
    };
    for (std::uint32_t row = 0; row < Height; ++row) mix(buffer + static_cast<std::size_t>(row) * pitch);
    const auto* chroma = buffer + static_cast<std::size_t>(pitch) * Height;
    for (std::uint32_t row = 0; row < Height / 2; ++row) mix(chroma + static_cast<std::size_t>(row) * pitch);
    return hash;
}

std::vector<std::vector<std::uint8_t>> accessUnits(bool lengthPrefixed) {
    std::vector<std::size_t> starts;
    for (std::size_t index = 0; index + 4 < Stream.size(); ++index) {
        if (Stream[index] == 0 && Stream[index + 1] == 0 && Stream[index + 2] == 0 && Stream[index + 3] == 1 && (Stream[index + 4] & 0x1fu) == 9) starts.push_back(index);
    }
    starts.push_back(Stream.size());
    std::vector<std::vector<std::uint8_t>> units;
    for (std::size_t unit = 0; unit + 1 < starts.size(); ++unit) {
        if (!lengthPrefixed) {
            units.emplace_back(Stream.begin() + static_cast<std::ptrdiff_t>(starts[unit]), Stream.begin() + static_cast<std::ptrdiff_t>(starts[unit + 1]));
            continue;
        }
        std::vector<std::size_t> nals;
        for (std::size_t index = starts[unit]; index + 3 < starts[unit + 1]; ++index) {
            if (Stream[index] == 0 && Stream[index + 1] == 0 && Stream[index + 2] == 1) {
                nals.push_back(index + 3);
                index += 2;
            }
        }
        std::vector<std::uint8_t> converted;
        for (std::size_t nal = 0; nal < nals.size(); ++nal) {
            auto end = nal + 1 < nals.size() ? nals[nal + 1] - 3 : starts[unit + 1];
            while (end > nals[nal] && Stream[end - 1] == 0) --end;
            const auto length = end - nals[nal];
            for (int shift = 24; shift >= 0; shift -= 8) converted.push_back(static_cast<std::uint8_t>(length >> shift));
            converted.insert(converted.end(), Stream.begin() + static_cast<std::ptrdiff_t>(nals[nal]), Stream.begin() + static_cast<std::ptrdiff_t>(end));
        }
        units.push_back(std::move(converted));
    }
    return units;
}

template <typename TAction>
void checkThrows(TAction action) {
    bool threw = false;
    try {
        action();
    } catch (const std::runtime_error&) {
        threw = true;
    }
    check(threw, "expected a decoding exception");
}

void testFailures() {
    DecoderConfigInfo config{sizeof(DecoderConfigInfo), 0, 2, 100, 0, static_cast<std::int32_t>(Width), static_cast<std::int32_t>(Height), 4, 1};
    DecoderMemoryInfo memory{sizeof(DecoderMemoryInfo)};
    std::uint64_t handle = 0;
    checkThrows([&] { sceVideodec2CreateDecoder_nid_postfix(&config, &memory, &handle); });
    check(handle == 0, "unsupported codec created a decoder");
    config.codecType = 1;
    config.maxFrameWidth = 0;
    checkThrows([&] { sceVideodec2QueryDecoderMemoryInfo_nid_postfix(&config, &memory); });
    config.maxFrameWidth = Width;
    check(sceVideodec2QueryDecoderMemoryInfo_nid_postfix(&config, &memory) == 0, "memory query failed");
    check(sceVideodec2CreateDecoder_nid_postfix(&config, &memory, &handle) == 0, "decoder creation failed");
    std::vector<std::uint8_t> buffer(memory.maxFrameBufferSize);
    FrameBuffer frame{sizeof(FrameBuffer), buffer.data(), buffer.size(), false};
    OutputInfo output{sizeof(OutputInfo)};
    const std::array<std::uint8_t, 5> malformed{0, 0, 0, 8, 0x65};
    InputData input{sizeof(InputData), malformed.data(), malformed.size(), 0, 0, 0};
    checkThrows([&] { sceVideodec2Decode_nid_postfix(handle, &input, &frame, &output); });
    input.auSize = 2;
    checkThrows([&] { sceVideodec2Decode_nid_postfix(handle, &input, &frame, &output); });
    check(sceVideodec2Reset_nid_postfix(handle) == 0, "reset failed");
    AvcPictureInfo avc{sizeof(AvcPictureInfo)};
    checkThrows([&] { sceVideodec2GetAvcPictureInfo_nid_postfix(nullptr, &avc, nullptr); });
    checkThrows([&] { sceVideodec2GetAvcPictureInfo_nid_postfix(&output, nullptr, nullptr); });
    output.frameBuffer = buffer.data();
    check(sceVideodec2GetAvcPictureInfo_nid_postfix(&output, &avc, nullptr) == 0 && !avc.isValid, "unknown frame buffer reported a picture");
    frame.frameBufferSize = 1;
    checkThrows([&] {
        for (const auto& unit : accessUnits(false)) {
            input.auData = unit.data();
            input.auSize = unit.size();
            sceVideodec2Decode_nid_postfix(handle, &input, &frame, &output);
        }
        sceVideodec2Flush_nid_postfix(handle, &frame, &output);
    });
    check(sceVideodec2DeleteDecoder_nid_postfix(handle) == 0, "delete failed");
}

void testDecode(bool lengthPrefixed) {
    const DecoderConfigInfo config{sizeof(DecoderConfigInfo), 0, 1, 100, 0, static_cast<std::int32_t>(Width), static_cast<std::int32_t>(Height), 4, 1};
    DecoderMemoryInfo memory{sizeof(DecoderMemoryInfo)};
    check(sceVideodec2QueryDecoderMemoryInfo_nid_postfix(&config, &memory) == 0, "memory query failed");
    std::uint64_t handle = 0;
    check(sceVideodec2CreateDecoder_nid_postfix(&config, &memory, &handle) == 0, "decoder creation failed");
    std::vector<std::uint8_t> buffer(memory.maxFrameBufferSize);
    std::size_t pictures = 0;
    const auto take = [&](const OutputInfo& output, const FrameBuffer& frame) {
        check(output.isValid == frame.isAccepted, "frame buffer acceptance disagrees with the output");
        if (!output.isValid) return false;
        check(pictures < PictureHashes.size(), "more pictures than access units");
        check(!output.isErrorFrame && output.frameWidth == Width && output.frameHeight == Height && output.framePitch == 256 && output.frameBuffer == buffer.data(), "unexpected picture geometry");
        AvcPictureInfo info{sizeof(AvcPictureInfo)};
        check(sceVideodec2GetPictureInfo_nid_postfix(&output, &info, nullptr) == 0 && info.isValid, "picture info missing");
        const auto unit = DisplayOrderUnits[pictures];
        check(info.ptsData == 1000 + unit && info.dtsData == unit && info.attachedData == 0xa0 + unit, "picture timestamps out of display order");
        check(info.idrPictureFlag == (pictures == 0 ? 1 : 0) && info.profileIdc == 100, "picture flags mismatch");
        AvcPictureInfo avc{sizeof(AvcPictureInfo)};
        check(sceVideodec2GetAvcPictureInfo_nid_postfix(&output, &avc, nullptr) == 0 && avc.isValid, "avc picture info missing");
        check(avc.ptsData == 1000 + unit && avc.dtsData == unit && avc.attachedData == 0xa0 + unit && avc.idrPictureFlag == (pictures == 0 ? 1 : 0) && avc.profileIdc == 100 && avc.picWidthInLumaSamples == Width && avc.picHeightInLumaSamples == Height, "avc picture info mismatch");
        check(hashNv12(buffer.data(), output.framePitch) == PictureHashes[pictures], "picture " + std::to_string(pictures) + " differs from the reference");
        ++pictures;
        return true;
    };
    const auto units = accessUnits(lengthPrefixed);
    check(units.size() == PictureHashes.size(), "unexpected access unit count");
    for (std::size_t unit = 0; unit < units.size(); ++unit) {
        const InputData input{sizeof(InputData), units[unit].data(), units[unit].size(), 1000 + unit, unit, 0xa0 + unit};
        FrameBuffer frame{sizeof(FrameBuffer), buffer.data(), buffer.size(), false};
        OutputInfo output{sizeof(OutputInfo)};
        check(sceVideodec2Decode_nid_postfix(handle, &input, &frame, &output) == 0, "decode failed");
        take(output, frame);
    }
    for (;;) {
        FrameBuffer frame{sizeof(FrameBuffer), buffer.data(), buffer.size(), false};
        OutputInfo output{sizeof(OutputInfo)};
        check(sceVideodec2Flush_nid_postfix(handle, &frame, &output) == 0, "flush failed");
        if (!take(output, frame)) break;
    }
    check(pictures == PictureHashes.size(), "missing pictures after flush");
    check(sceVideodec2Reset_nid_postfix(handle) == 0, "reset failed");
    check(sceVideodec2DeleteDecoder_nid_postfix(handle) == 0, "delete failed");
    checkThrows([&] { sceVideodec2DeleteDecoder_nid_postfix(handle); });
}

}

int main() {
    try {
        testFailures();
        testDecode(false);
        testDecode(true);
        std::puts("Videodec2 tests passed");
        return 0;
    } catch (const std::exception& error) {
        std::fprintf(stderr, "%s\n", error.what());
        return 1;
    }
}