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d7459354f5
The current code inserts and deletes elements from the beginning of the audio buffer, which is very inefficient in an std::vector. Profiling was done using VisualStudio2017's Performance Analyzer in Super Mario 3D Land. Before this change: AudioInterp::Linear had 14.14% of the runtime (inclusive) and most of that time was spent in std::vector's insert implementation. After this change: AudioInterp::Linear has 0.36% of the runtime (inclusive)
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <array>
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#include <deque>
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#include "common/common_types.h"
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namespace Codec {
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/// A variable length buffer of signed PCM16 stereo samples.
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using StereoBuffer16 = std::deque<std::array<s16, 2>>;
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/// See: Codec::DecodeADPCM
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struct ADPCMState {
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// Two historical samples from previous processed buffer,
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// required for ADPCM decoding
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s16 yn1; ///< y[n-1]
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s16 yn2; ///< y[n-2]
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};
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/**
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* @param data Pointer to buffer that contains ADPCM data to decode
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* @param sample_count Length of buffer in terms of number of samples
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* @param adpcm_coeff ADPCM coefficients
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* @param state ADPCM state, this is updated with new state
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* @return Decoded stereo signed PCM16 data, sample_count in length
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*/
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StereoBuffer16 DecodeADPCM(const u8* const data, const size_t sample_count,
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const std::array<s16, 16>& adpcm_coeff, ADPCMState& state);
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/**
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* @param num_channels Number of channels
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* @param data Pointer to buffer that contains PCM8 data to decode
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* @param sample_count Length of buffer in terms of number of samples
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* @return Decoded stereo signed PCM16 data, sample_count in length
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*/
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StereoBuffer16 DecodePCM8(const unsigned num_channels, const u8* const data,
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const size_t sample_count);
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/**
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* @param num_channels Number of channels
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* @param data Pointer to buffer that contains PCM16 data to decode
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* @param sample_count Length of buffer in terms of number of samples
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* @return Decoded stereo signed PCM16 data, sample_count in length
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*/
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StereoBuffer16 DecodePCM16(const unsigned num_channels, const u8* const data,
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const size_t sample_count);
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};
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