56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// Project64 - A Nintendo 64 emulator
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// https://www.pj64-emu.com/
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// Copyright(C) 2001-2021 Project64
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// Copyright(C) 2000-2015 Azimer
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// GNU/GPLv2 licensed: https://gnu.org/licenses/gpl-2.0.html
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#pragma once
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#include <Common/SyncEvent.h>
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#include <Common/CriticalSection.h>
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enum
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{
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AI_STATUS_FIFO_FULL = 0x80000000, // Bit 31: full
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AI_STATUS_DMA_BUSY = 0x40000000, // Bit 30: busy
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MI_INTR_AI = 0x04, // Bit 2: AI INTR
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AI_CONTROL_DMA_ON = 0x01,
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AI_CONTROL_DMA_OFF = 0x00,
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};
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class SoundDriverBase
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{
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public:
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SoundDriverBase();
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void AI_SetFrequency(uint32_t Frequency, uint32_t BufferSize);
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void AI_LenChanged(uint8_t *start, uint32_t length);
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void AI_Startup();
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void AI_Shutdown();
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void AI_Update(bool Wait);
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uint32_t AI_ReadLength();
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virtual void SetFrequency(uint32_t Frequency, uint32_t BufferSize);
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virtual void StartAudio();
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virtual void StopAudio();
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protected:
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enum { MAX_SIZE = 48000 * 2 * 2 }; // Max buffer size (44100Hz * 16-bit * stereo)
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virtual bool Initialize();
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void LoadAiBuffer(uint8_t *start, uint32_t length); // Reads in length amount of audio bytes
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uint32_t m_MaxBufferSize; // Variable size determined by playback rate
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CriticalSection m_CS;
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private:
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void BufferAudio();
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SyncEvent m_AiUpdateEvent;
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uint8_t *m_AI_DMAPrimaryBuffer, *m_AI_DMASecondaryBuffer;
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uint32_t m_AI_DMAPrimaryBytes, m_AI_DMASecondaryBytes;
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uint32_t m_BufferRemaining; // Buffer remaining
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uint32_t m_CurrentReadLoc; // Currently playing buffer
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uint32_t m_CurrentWriteLoc; // Currently writing buffer
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uint8_t m_Buffer[MAX_SIZE]; // Emulated buffers
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};
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