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// SPDX-FileCopyrightText: Ryujinx Team and Contributors
// SPDX-License-Identifier: MIT
#pragma once
#include <span>
#include <vector>
#include "common/bit_field.h"
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "common/scratch_buffer.h"
#include "video_core/host1x/nvdec_common.h"
namespace Tegra {
namespace Host1x {
class Host1x;
} // namespace Host1x
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(u32 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(Common::ScratchBuffer<u8>& scan, std::span<const u8> list, s32 start,
s32 count);
/// Return the bitstream as a vector.
[[nodiscard]] std::vector<u8>& GetByteArray();
[[nodiscard]] const std::vector<u8>& GetByteArray() const;
private:
void WriteBits(s32 value, s32 bit_count);
void WriteExpGolombCodedInt(s32 value);
void WriteExpGolombCodedUInt(u32 value);
[[nodiscard]] s32 GetFreeBufferBits();
void Flush();
s32 buffer_size{8};
s32 buffer{};
s32 buffer_pos{};
std::vector<u8> byte_array;
};
class H264 {
public:
explicit H264(Host1x::Host1x& host1x);
~H264();
/// Compose the H264 frame for FFmpeg decoding
[[nodiscard]] std::span<const u8> ComposeFrame(const Host1x::NvdecCommon::NvdecRegisters& state,
bool is_first_frame = false);
private:
Common::ScratchBuffer<u8> frame;
Common::ScratchBuffer<u8> scan;
Host1x::Host1x& host1x;
struct H264ParameterSet {
s32 log2_max_pic_order_cnt_lsb_minus4; ///< 0x00
s32 delta_pic_order_always_zero_flag; ///< 0x04
s32 frame_mbs_only_flag; ///< 0x08
u32 pic_width_in_mbs; ///< 0x0C
u32 frame_height_in_map_units; ///< 0x10
union { ///< 0x14
BitField<0, 2, u32> tile_format;
BitField<2, 3, u32> gob_height;
};
u32 entropy_coding_mode_flag; ///< 0x18
s32 pic_order_present_flag; ///< 0x1C
s32 num_refidx_l0_default_active; ///< 0x20
s32 num_refidx_l1_default_active; ///< 0x24
s32 deblocking_filter_control_present_flag; ///< 0x28
s32 redundant_pic_cnt_present_flag; ///< 0x2C
u32 transform_8x8_mode_flag; ///< 0x30
u32 pitch_luma; ///< 0x34
u32 pitch_chroma; ///< 0x38
u32 luma_top_offset; ///< 0x3C
u32 luma_bot_offset; ///< 0x40
u32 luma_frame_offset; ///< 0x44
u32 chroma_top_offset; ///< 0x48
u32 chroma_bot_offset; ///< 0x4C
u32 chroma_frame_offset; ///< 0x50
u32 hist_buffer_size; ///< 0x54
union { ///< 0x58
union {
BitField<0, 1, u64> mbaff_frame;
BitField<1, 1, u64> direct_8x8_inference;
BitField<2, 1, u64> weighted_pred;
BitField<3, 1, u64> constrained_intra_pred;
BitField<4, 1, u64> ref_pic;
BitField<5, 1, u64> field_pic;
BitField<6, 1, u64> bottom_field;
BitField<7, 1, u64> second_field;
} flags;
BitField<8, 4, u64> log2_max_frame_num_minus4;
BitField<12, 2, u64> chroma_format_idc;
BitField<14, 2, u64> pic_order_cnt_type;
BitField<16, 6, s64> pic_init_qp_minus26;
BitField<22, 5, s64> chroma_qp_index_offset;
BitField<27, 5, s64> second_chroma_qp_index_offset;
BitField<32, 2, u64> weighted_bipred_idc;
BitField<34, 7, u64> curr_pic_idx;
BitField<41, 5, u64> curr_col_idx;
BitField<46, 16, u64> frame_number;
BitField<62, 1, u64> frame_surfaces;
BitField<63, 1, u64> output_memory_layout;
};
};
static_assert(sizeof(H264ParameterSet) == 0x60, "H264ParameterSet is an invalid size");
struct H264DecoderContext {
INSERT_PADDING_WORDS_NOINIT(18); ///< 0x0000
u32 stream_len; ///< 0x0048
INSERT_PADDING_WORDS_NOINIT(3); ///< 0x004C
H264ParameterSet h264_parameter_set; ///< 0x0058
INSERT_PADDING_WORDS_NOINIT(66); ///< 0x00B8
std::array<u8, 0x60> weight_scale; ///< 0x01C0
std::array<u8, 0x80> weight_scale_8x8; ///< 0x0220
};
static_assert(sizeof(H264DecoderContext) == 0x2A0, "H264DecoderContext is an invalid size");
#define ASSERT_POSITION(field_name, position) \
static_assert(offsetof(H264ParameterSet, field_name) == position, \
"Field " #field_name " has invalid position")
ASSERT_POSITION(log2_max_pic_order_cnt_lsb_minus4, 0x00);
ASSERT_POSITION(delta_pic_order_always_zero_flag, 0x04);
ASSERT_POSITION(frame_mbs_only_flag, 0x08);
ASSERT_POSITION(pic_width_in_mbs, 0x0C);
ASSERT_POSITION(frame_height_in_map_units, 0x10);
ASSERT_POSITION(tile_format, 0x14);
ASSERT_POSITION(entropy_coding_mode_flag, 0x18);
ASSERT_POSITION(pic_order_present_flag, 0x1C);
ASSERT_POSITION(num_refidx_l0_default_active, 0x20);
ASSERT_POSITION(num_refidx_l1_default_active, 0x24);
ASSERT_POSITION(deblocking_filter_control_present_flag, 0x28);
ASSERT_POSITION(redundant_pic_cnt_present_flag, 0x2C);
ASSERT_POSITION(transform_8x8_mode_flag, 0x30);
ASSERT_POSITION(pitch_luma, 0x34);
ASSERT_POSITION(pitch_chroma, 0x38);
ASSERT_POSITION(luma_top_offset, 0x3C);
ASSERT_POSITION(luma_bot_offset, 0x40);
ASSERT_POSITION(luma_frame_offset, 0x44);
ASSERT_POSITION(chroma_top_offset, 0x48);
ASSERT_POSITION(chroma_bot_offset, 0x4C);
ASSERT_POSITION(chroma_frame_offset, 0x50);
ASSERT_POSITION(hist_buffer_size, 0x54);
ASSERT_POSITION(flags, 0x58);
#undef ASSERT_POSITION
#define ASSERT_POSITION(field_name, position) \
static_assert(offsetof(H264DecoderContext, field_name) == position, \
"Field " #field_name " has invalid position")
ASSERT_POSITION(stream_len, 0x48);
ASSERT_POSITION(h264_parameter_set, 0x58);
ASSERT_POSITION(weight_scale, 0x1C0);
#undef ASSERT_POSITION
};
} // namespace Decoder
} // namespace Tegra
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