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Diffstat (limited to '')
-rw-r--r-- | src/video_core/command_classes/codecs/h264.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/video_core/command_classes/codecs/h264.h b/src/video_core/command_classes/codecs/h264.h new file mode 100644 index 000000000..21752dd90 --- /dev/null +++ b/src/video_core/command_classes/codecs/h264.h @@ -0,0 +1,130 @@ +// 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 |