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// MIT License
//
// Copyright (c) Ryujinx Team and Contributors
//
// 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,
// sublicense, 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 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
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 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.
//
#pragma once
#include <vector>
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "video_core/command_classes/nvdec_common.h"
namespace Tegra {
class GPU;
namespace Decoder {
class H264BitWriter {
public:
H264BitWriter();
~H264BitWriter();
/// The following Write methods are based on clause 9.1 in the H.264 specification.
/// WriteSe and WriteUe write in the Exp-Golomb-coded syntax
void WriteU(s32 value, s32 value_sz);
void WriteSe(s32 value);
void WriteUe(s32 value);
/// Finalize the bitstream
void End();
/// append a bit to the stream, equivalent value to the state parameter
void WriteBit(bool state);
/// Based on section 7.3.2.1.1.1 and Table 7-4 in the H.264 specification
/// Writes the scaling matrices of the sream
void WriteScalingList(const std::vector<u8>& list, s32 start, s32 count);
/// Return the bitstream as a vector.
std::vector<u8>& GetByteArray();
const std::vector<u8>& GetByteArray() const;
private:
// ZigZag LUTs from libavcodec.
static constexpr std::array<u8, 64> zig_zag_direct{
0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48,
41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23,
30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63,
};
static constexpr std::array<u8, 16> zig_zag_scan{
0 + 0 * 4, 1 + 0 * 4, 0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 2 + 0 * 4, 3 + 0 * 4, 2 + 1 * 4,
1 + 2 * 4, 0 + 3 * 4, 1 + 3 * 4, 2 + 2 * 4, 3 + 1 * 4, 3 + 2 * 4, 2 + 3 * 4, 3 + 3 * 4,
};
void WriteBits(s32 value, s32 bit_count);
void WriteExpGolombCodedInt(s32 value);
void WriteExpGolombCodedUInt(u32 value);
s32 GetFreeBufferBits();
void Flush();
s32 buffer_size{8};
s32 buffer{};
s32 buffer_pos{};
std::vector<u8> byte_array;
};
class H264 {
public:
explicit H264(GPU& gpu);
~H264();
/// Compose the H264 header of the frame for FFmpeg decoding
std::vector<u8>& ComposeFrameHeader(NvdecCommon::NvdecRegisters& state,
bool is_first_frame = false);
private:
struct H264ParameterSet {
u32 log2_max_pic_order_cnt{};
u32 delta_pic_order_always_zero_flag{};
u32 frame_mbs_only_flag{};
u32 pic_width_in_mbs{};
u32 pic_height_in_map_units{};
INSERT_PADDING_WORDS(1);
u32 entropy_coding_mode_flag{};
u32 bottom_field_pic_order_flag{};
u32 num_refidx_l0_default_active{};
u32 num_refidx_l1_default_active{};
u32 deblocking_filter_control_flag{};
u32 redundant_pic_count_flag{};
u32 transform_8x8_mode_flag{};
INSERT_PADDING_WORDS(9);
u64 flags{};
u32 frame_number{};
u32 frame_number2{};
};
static_assert(sizeof(H264ParameterSet) == 0x68, "H264ParameterSet is an invalid size");
struct H264DecoderContext {
INSERT_PADDING_BYTES(0x48);
u32 frame_data_size{};
INSERT_PADDING_BYTES(0xc);
H264ParameterSet h264_parameter_set{};
INSERT_PADDING_BYTES(0x100);
std::array<u8, 0x60> scaling_matrix_4;
std::array<u8, 0x80> scaling_matrix_8;
};
static_assert(sizeof(H264DecoderContext) == 0x2a0, "H264DecoderContext is an invalid size");
std::vector<u8> frame;
GPU& gpu;
};
} // namespace Decoder
} // namespace Tegra
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