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60 lines
1.9 KiB
60 lines
1.9 KiB
5 years ago
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Mixer for ADPCM encoded audio
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//
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//=============================================================================//
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#ifndef SND_WAVE_MIXER_MP3_H
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#define SND_WAVE_MIXER_MP3_H
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#pragma once
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#include "vaudio/ivaudio.h"
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static const int MP3_BUFFER_SIZE = 16384;
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class CAudioMixerWaveMP3 : public CAudioMixerWave, public IAudioStreamEvent
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{
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public:
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CAudioMixerWaveMP3( IWaveData *data );
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~CAudioMixerWaveMP3( void );
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virtual void Mix( IAudioDevice *pDevice, channel_t *pChannel, void *pData, int outputOffset, int inputOffset, fixedint fracRate, int outCount, int timecompress );
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virtual int GetOutputData( void **pData, int sampleCount, char copyBuf[AUDIOSOURCE_COPYBUF_SIZE] );
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// need to override this to fixup blocks
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// UNDONE: This doesn't quite work with MP3 - we need a MP3 position, not a sample position
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void SetSampleStart( int newPosition );
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int GetPositionForSave() { return GetStream() ? GetStream()->GetPosition() : 0; }
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void SetPositionFromSaved(int position) { if ( GetStream() ) GetStream()->SetPosition(position); }
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// IAudioStreamEvent
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virtual int StreamRequestData( void *pBuffer, int bytesRequested, int offset );
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virtual void SetStartupDelaySamples( int delaySamples );
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virtual int GetMixSampleSize() { return CalcSampleSize( 16, m_channelCount ); }
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virtual int GetStreamOutputRate() { return GetStream() ? GetStream()->GetOutputRate() : 0; }
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private:
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IAudioStream *GetStream();
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bool DecodeBlock( void );
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void GetID3HeaderOffset();
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// Lazily initialized, use GetStream
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IAudioStream *m_pStream;
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bool m_bStreamInit;
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char m_samples[MP3_BUFFER_SIZE];
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int m_sampleCount;
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int m_samplePosition;
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int m_channelCount;
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int m_offset;
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int m_delaySamples;
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int m_headerOffset;
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};
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CAudioMixerWaveMP3 *CreateMP3Mixer( IWaveData *data );
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#endif // SND_WAVE_MIXER_MP3_H
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