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Diffstat (limited to 'src/video_core/command_classes/codecs/vp9.h')
| -rw-r--r-- | src/video_core/command_classes/codecs/vp9.h | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/src/video_core/command_classes/codecs/vp9.h b/src/video_core/command_classes/codecs/vp9.h new file mode 100644 index 000000000..748e11bae --- /dev/null +++ b/src/video_core/command_classes/codecs/vp9.h @@ -0,0 +1,216 @@ +// Copyright 2020 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include <unordered_map> +#include <vector> +#include "common/common_funcs.h" +#include "common/common_types.h" +#include "common/stream.h" +#include "video_core/command_classes/codecs/vp9_types.h" +#include "video_core/command_classes/nvdec_common.h" + +namespace Tegra { +class GPU; +enum class FrameType { KeyFrame = 0, InterFrame = 1 }; +namespace Decoder { + +/// The VpxRangeEncoder, and VpxBitStreamWriter classes are used to compose the +/// VP9 header bitstreams. + +class VpxRangeEncoder { +public: + VpxRangeEncoder(); + ~VpxRangeEncoder(); + + /// Writes the rightmost value_size bits from value into the stream + void Write(s32 value, s32 value_size); + + /// Writes a single bit with half probability + void Write(bool bit); + + /// Writes a bit to the base_stream encoded with probability + void Write(bool bit, s32 probability); + + /// Signal the end of the bitstream + void End(); + + std::vector<u8>& GetBuffer() { + return base_stream.GetBuffer(); + } + + const std::vector<u8>& GetBuffer() const { + return base_stream.GetBuffer(); + } + +private: + u8 PeekByte(); + Common::Stream base_stream{}; + u32 low_value{}; + u32 range{0xff}; + s32 count{-24}; + s32 half_probability{128}; + static constexpr std::array<s32, 256> norm_lut{ + 0, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + }; +}; + +class VpxBitStreamWriter { +public: + VpxBitStreamWriter(); + ~VpxBitStreamWriter(); + + /// Write an unsigned integer value + void WriteU(u32 value, u32 value_size); + + /// Write a signed integer value + void WriteS(s32 value, u32 value_size); + + /// Based on 6.2.10 of VP9 Spec, writes a delta coded value + void WriteDeltaQ(u32 value); + + /// Write a single bit. + void WriteBit(bool state); + + /// Pushes current buffer into buffer_array, resets buffer + void Flush(); + + /// Returns byte_array + std::vector<u8>& GetByteArray(); + + /// Returns const byte_array + const std::vector<u8>& GetByteArray() const; + +private: + /// Write bit_count bits from value into buffer + void WriteBits(u32 value, u32 bit_count); + + /// Gets next available position in buffer, invokes Flush() if buffer is full + s32 GetFreeBufferBits(); + + s32 buffer_size{8}; + + s32 buffer{}; + s32 buffer_pos{}; + std::vector<u8> byte_array; +}; + +class VP9 { +public: + explicit VP9(GPU& gpu); + ~VP9(); + + /// Composes the VP9 frame from the GPU state information. Based on the official VP9 spec + /// documentation + std::vector<u8>& ComposeFrameHeader(NvdecCommon::NvdecRegisters& state); + + /// Returns true if the most recent frame was a hidden frame. + bool WasFrameHidden() const { + return hidden; + } + +private: + /// Generates compressed header probability updates in the bitstream writer + template <typename T, std::size_t N> + void WriteProbabilityUpdate(VpxRangeEncoder& writer, const std::array<T, N>& new_prob, + const std::array<T, N>& old_prob); + + /// Generates compressed header probability updates in the bitstream writer + /// If probs are not equal, WriteProbabilityDelta is invoked + void WriteProbabilityUpdate(VpxRangeEncoder& writer, u8 new_prob, u8 old_prob); + + /// Generates compressed header probability deltas in the bitstream writer + void WriteProbabilityDelta(VpxRangeEncoder& writer, u8 new_prob, u8 old_prob); + + /// Adjusts old_prob depending on new_prob. Based on section 6.3.5 of VP9 Specification + s32 RemapProbability(s32 new_prob, s32 old_prob); + + /// Recenters probability. Based on section 6.3.6 of VP9 Specification + s32 RecenterNonNeg(s32 new_prob, s32 old_prob); + + /// Inverse of 6.3.4 Decode term subexp + void EncodeTermSubExp(VpxRangeEncoder& writer, s32 value); + + /// Writes if the value is less than the test value + bool WriteLessThan(VpxRangeEncoder& writer, s32 value, s32 test); + + /// Writes probability updates for the Coef probabilities + void WriteCoefProbabilityUpdate(VpxRangeEncoder& writer, s32 tx_mode, + const std::array<u8, 2304>& new_prob, + const std::array<u8, 2304>& old_prob); + + /// Write probabilities for 4-byte aligned structures + template <typename T, std::size_t N> + void WriteProbabilityUpdateAligned4(VpxRangeEncoder& writer, const std::array<T, N>& new_prob, + const std::array<T, N>& old_prob); + + /// Write motion vector probability updates. 6.3.17 in the spec + void WriteMvProbabilityUpdate(VpxRangeEncoder& writer, u8 new_prob, u8 old_prob); + + /// 6.2.14 Tile size calculation + s32 CalcMinLog2TileCols(s32 frame_width); + s32 CalcMaxLog2TileCols(s32 frame_width); + + /// Returns VP9 information from NVDEC provided offset and size + Vp9PictureInfo GetVp9PictureInfo(const NvdecCommon::NvdecRegisters& state); + + /// Read and convert NVDEC provided entropy probs to Vp9EntropyProbs struct + void InsertEntropy(u64 offset, Vp9EntropyProbs& dst); + + /// Returns frame to be decoded after buffering + Vp9FrameContainer GetCurrentFrame(const NvdecCommon::NvdecRegisters& state); + + /// Use NVDEC providied information to compose the headers for the current frame + std::vector<u8> ComposeCompressedHeader(); + VpxBitStreamWriter ComposeUncompressedHeader(); + + GPU& gpu; + std::vector<u8> frame; + + std::array<s8, 4> loop_filter_ref_deltas{}; + std::array<s8, 2> loop_filter_mode_deltas{}; + + bool hidden; + s64 current_frame_number = -2; // since we buffer 2 frames + s32 grace_period = 6; // frame offsets need to stabilize + std::array<FrameContexts, 4> frame_ctxs{}; + Vp9FrameContainer next_frame{}; + Vp9FrameContainer next_next_frame{}; + bool swap_next_golden{}; + + Vp9PictureInfo current_frame_info{}; + Vp9EntropyProbs prev_frame_probs{}; + + s32 diff_update_probability = 252; + s32 frame_sync_code = 0x498342; + static constexpr std::array<s32, 254> map_lut = { + 20, 21, 22, 23, 24, 25, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, + 36, 37, 1, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 2, 50, + 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 3, 62, 63, 64, 65, 66, + 67, 68, 69, 70, 71, 72, 73, 4, 74, 75, 76, 77, 78, 79, 80, 81, 82, + 83, 84, 85, 5, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 6, + 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 7, 110, 111, 112, 113, + 114, 115, 116, 117, 118, 119, 120, 121, 8, 122, 123, 124, 125, 126, 127, 128, 129, + 130, 131, 132, 133, 9, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, + 10, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 11, 158, 159, 160, + 161, 162, 163, 164, 165, 166, 167, 168, 169, 12, 170, 171, 172, 173, 174, 175, 176, + 177, 178, 179, 180, 181, 13, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, + 193, 14, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 15, 206, 207, + 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 16, 218, 219, 220, 221, 222, 223, + 224, 225, 226, 227, 228, 229, 17, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, + 240, 241, 18, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 19, + }; +}; + +} // namespace Decoder +} // namespace Tegra |