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492 lines
14 KiB
492 lines
14 KiB
//========= Copyright Valve Corporation, All rights reserved. ============// |
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// |
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// Purpose: |
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// |
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//=============================================================================// |
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#include "cbase.h" |
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#include <stdio.h> |
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#include <windows.h> |
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#include "snd_audio_source.h" |
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#include "snd_wave_source.h" |
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#include "snd_wave_mixer_private.h" |
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#include "snd_wave_mixer_adpcm.h" |
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#include "iscenemanagersound.h" |
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#include "AudioWaveOutput.h" |
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#include "tier2/riff.h" |
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typedef struct channel_s |
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{ |
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int leftvol; |
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int rightvol; |
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int rleftvol; |
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int rrightvol; |
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float pitch; |
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} channel_t; |
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//----------------------------------------------------------------------------- |
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// These mixers provide an abstraction layer between the audio device and |
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// mixing/decoding code. They allow data to be decoded and mixed using |
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// optimized, format sensitive code by calling back into the device that |
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// controls them. |
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//----------------------------------------------------------------------------- |
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//----------------------------------------------------------------------------- |
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// Purpose: maps mixing to 8-bit mono mixer |
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//----------------------------------------------------------------------------- |
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class CAudioMixerWave8Mono : public CAudioMixerWave |
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{ |
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public: |
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CAudioMixerWave8Mono( CWaveData *data ) : CAudioMixerWave( data ) {} |
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virtual void Mix( IAudioDevice *pDevice, channel_t *pChannel, void *pData, int outputOffset, int inputOffset, fixedint fracRate, int outCount, int timecompress, bool forward = true ) |
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{ |
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pDevice->Mix8Mono( pChannel, (char *)pData, outputOffset, inputOffset, fracRate, outCount, timecompress, forward ); |
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} |
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}; |
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//----------------------------------------------------------------------------- |
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// Purpose: maps mixing to 8-bit stereo mixer |
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//----------------------------------------------------------------------------- |
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class CAudioMixerWave8Stereo : public CAudioMixerWave |
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{ |
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public: |
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CAudioMixerWave8Stereo( CWaveData *data ) : CAudioMixerWave( data ) {} |
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virtual void Mix( IAudioDevice *pDevice, channel_t *pChannel, void *pData, int outputOffset, int inputOffset, fixedint fracRate, int outCount, int timecompress, bool forward = true ) |
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{ |
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pDevice->Mix8Stereo( pChannel, (char *)pData, outputOffset, inputOffset, fracRate, outCount, timecompress, forward ); |
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} |
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}; |
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//----------------------------------------------------------------------------- |
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// Purpose: maps mixing to 16-bit mono mixer |
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//----------------------------------------------------------------------------- |
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class CAudioMixerWave16Mono : public CAudioMixerWave |
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{ |
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public: |
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CAudioMixerWave16Mono( CWaveData *data ) : CAudioMixerWave( data ) {} |
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virtual void Mix( IAudioDevice *pDevice, channel_t *pChannel, void *pData, int outputOffset, int inputOffset, fixedint fracRate, int outCount, int timecompress, bool forward = true ) |
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{ |
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pDevice->Mix16Mono( pChannel, (short *)pData, outputOffset, inputOffset, fracRate, outCount, timecompress, forward ); |
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} |
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}; |
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//----------------------------------------------------------------------------- |
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// Purpose: maps mixing to 16-bit stereo mixer |
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//----------------------------------------------------------------------------- |
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class CAudioMixerWave16Stereo : public CAudioMixerWave |
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{ |
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public: |
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CAudioMixerWave16Stereo( CWaveData *data ) : CAudioMixerWave( data ) {} |
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virtual void Mix( IAudioDevice *pDevice, channel_t *pChannel, void *pData, int outputOffset, int inputOffset, fixedint fracRate, int outCount, int timecompress, bool forward = true ) |
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{ |
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pDevice->Mix16Stereo( pChannel, (short *)pData, outputOffset, inputOffset, fracRate, outCount, timecompress, forward ); |
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} |
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}; |
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//----------------------------------------------------------------------------- |
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// Purpose: Create an approprite mixer type given the data format |
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// Input : *data - data access abstraction |
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// format - pcm or adpcm (1 or 2 -- RIFF format) |
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// channels - number of audio channels (1 = mono, 2 = stereo) |
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// bits - bits per sample |
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// Output : CAudioMixer * abstract mixer type that maps mixing to appropriate code |
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//----------------------------------------------------------------------------- |
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CAudioMixer *CreateWaveMixer( CWaveData *data, int format, int channels, int bits ) |
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{ |
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if ( format == WAVE_FORMAT_PCM ) |
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{ |
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if ( channels > 1 ) |
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{ |
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if ( bits == 8 ) |
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return new CAudioMixerWave8Stereo( data ); |
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else |
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return new CAudioMixerWave16Stereo( data ); |
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} |
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else |
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{ |
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if ( bits == 8 ) |
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return new CAudioMixerWave8Mono( data ); |
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else |
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return new CAudioMixerWave16Mono( data ); |
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} |
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} |
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else if ( format == WAVE_FORMAT_ADPCM ) |
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{ |
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return CreateADPCMMixer( data ); |
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} |
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return NULL; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Init the base WAVE mixer. |
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// Input : *data - data access object |
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//----------------------------------------------------------------------------- |
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CAudioMixerWave::CAudioMixerWave( CWaveData *data ) : m_pData(data) |
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{ |
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m_loop = 0; |
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m_sample = 0; |
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m_absoluteSample = 0; |
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m_fracOffset = 0; |
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m_bActive = false; |
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m_nModelIndex = -1; |
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m_bForward = true; |
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m_bAutoDelete = true; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Frees the data access object (we own it after construction) |
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//----------------------------------------------------------------------------- |
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CAudioMixerWave::~CAudioMixerWave( void ) |
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{ |
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delete m_pData; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Decode and read the data |
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// by default we just pass the request on to the data access object |
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// other mixers may need to buffer or decode the data for some reason |
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// |
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// Input : **pData - dest pointer |
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// sampleCount - number of samples needed |
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// Output : number of samples available in this batch |
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//----------------------------------------------------------------------------- |
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int CAudioMixerWave::GetOutputData( void **pData, int samplePosition, int sampleCount, bool forward /*= true*/ ) |
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{ |
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if ( samplePosition != m_sample ) |
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{ |
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// Seek |
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m_sample = samplePosition; |
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m_absoluteSample = samplePosition; |
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} |
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return m_pData->ReadSourceData( pData, m_sample, sampleCount, forward ); |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: calls through the wavedata to get the audio source |
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// Output : CAudioSource |
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//----------------------------------------------------------------------------- |
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CAudioSource *CAudioMixerWave::GetSource( void ) |
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{ |
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if ( m_pData ) |
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return &m_pData->Source(); |
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return NULL; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Gets the current sample location in playback |
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// Output : int (samples from start of wave) |
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//----------------------------------------------------------------------------- |
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int CAudioMixerWave::GetSamplePosition( void ) |
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{ |
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return m_sample; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: |
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// Input : position - |
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//----------------------------------------------------------------------------- |
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bool CAudioMixerWave::SetSamplePosition( int position ) |
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{ |
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position = max( 0, position ); |
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m_sample = position; |
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m_absoluteSample = position; |
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m_startpos = m_sample; |
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return true; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: |
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// Input : position - |
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//----------------------------------------------------------------------------- |
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void CAudioMixerWave::SetLoopPosition( int position ) |
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{ |
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m_loop = position; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: |
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// Output : int |
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//----------------------------------------------------------------------------- |
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int CAudioMixerWave::GetStartPosition( void ) |
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{ |
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return m_startpos; |
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} |
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bool CAudioMixerWave::GetActive( void ) |
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{ |
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return m_bActive; |
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} |
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void CAudioMixerWave::SetActive( bool active ) |
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{ |
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m_bActive = active; |
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} |
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void CAudioMixerWave::SetModelIndex( int index ) |
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{ |
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m_nModelIndex = index; |
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} |
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int CAudioMixerWave::GetModelIndex( void ) const |
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{ |
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return m_nModelIndex; |
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} |
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void CAudioMixerWave::SetDirection( bool forward ) |
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{ |
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m_bForward = forward; |
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} |
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bool CAudioMixerWave::GetDirection( void ) const |
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{ |
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return m_bForward; |
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} |
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void CAudioMixerWave::SetAutoDelete( bool autodelete ) |
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{ |
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m_bAutoDelete = autodelete; |
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} |
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bool CAudioMixerWave::GetAutoDelete( void ) const |
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{ |
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return m_bAutoDelete; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: |
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// Input : *pChannel - |
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// sampleCount - |
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// outputRate - |
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//----------------------------------------------------------------------------- |
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void CAudioMixerWave::IncrementSamples( channel_t *pChannel, int startSample, int sampleCount,int outputRate, bool forward /*= true*/ ) |
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{ |
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int inputSampleRate = (int)(pChannel->pitch * m_pData->Source().SampleRate()); |
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float rate = (float)inputSampleRate / outputRate; |
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int startpos = startSample; |
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if ( !forward ) |
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{ |
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int requestedstart = startSample - (int)( sampleCount * rate ); |
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if ( requestedstart < 0 ) |
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return; |
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startpos = max( 0, requestedstart ); |
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SetSamplePosition( startpos ); |
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} |
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while ( sampleCount > 0 ) |
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{ |
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int inputSampleCount; |
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int outputSampleCount = sampleCount; |
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if ( outputRate != inputSampleRate ) |
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{ |
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inputSampleCount = (int)(sampleCount * rate); |
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} |
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else |
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{ |
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inputSampleCount = sampleCount; |
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} |
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sampleCount -= outputSampleCount; |
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if ( forward ) |
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{ |
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m_sample += inputSampleCount; |
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m_absoluteSample += inputSampleCount; |
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} |
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} |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: The device calls this to request data. The mixer must provide the |
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// full amount of samples or have silence in its output stream. |
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// Input : *pDevice - requesting device |
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// sampleCount - number of samples at the output rate |
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// outputRate - sampling rate of the request |
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// Output : Returns true to keep mixing, false to delete this mixer |
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//----------------------------------------------------------------------------- |
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bool CAudioMixerWave::SkipSamples( channel_t *pChannel, int startSample, int sampleCount, int outputRate, bool forward /*= true*/ ) |
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{ |
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int offset = 0; |
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int inputSampleRate = (int)(pChannel->pitch * m_pData->Source().SampleRate()); |
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float rate = (float)inputSampleRate / outputRate; |
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// fixedint fracstep = FIX_FLOAT( rate ); |
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sampleCount = min( sampleCount, PAINTBUFFER_SIZE ); |
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int startpos = startSample; |
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if ( !forward ) |
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{ |
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int requestedstart = startSample - (int)( sampleCount * rate ); |
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if ( requestedstart < 0 ) |
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return false; |
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startpos = max( 0, requestedstart ); |
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SetSamplePosition( startpos ); |
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} |
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while ( sampleCount > 0 ) |
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{ |
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int availableSamples; |
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int inputSampleCount; |
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char *pData = NULL; |
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int outputSampleCount = sampleCount; |
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if ( outputRate != inputSampleRate ) |
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{ |
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inputSampleCount = (int)(sampleCount * rate); |
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if ( !forward ) |
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{ |
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startSample = max( 0, startSample - inputSampleCount ); |
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} |
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int availableSamples = GetOutputData( (void **)&pData, startSample, inputSampleCount, forward ); |
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if ( !availableSamples ) |
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break; |
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if ( availableSamples < inputSampleCount ) |
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{ |
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outputSampleCount = (int)(availableSamples / rate); |
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inputSampleCount = availableSamples; |
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} |
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// compute new fraction part of sample index |
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float offset = (m_fracOffset / FIX_SCALE) + (rate * outputSampleCount); |
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offset = offset - (float)((int)offset); |
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m_fracOffset = FIX_FLOAT(offset); |
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} |
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else |
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{ |
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if ( !forward ) |
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{ |
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startSample = max( 0, startSample - sampleCount ); |
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} |
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availableSamples = GetOutputData( (void **)&pData, startSample, sampleCount, forward ); |
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if ( !availableSamples ) |
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break; |
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outputSampleCount = availableSamples; |
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inputSampleCount = availableSamples; |
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} |
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offset += outputSampleCount; |
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sampleCount -= outputSampleCount; |
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if ( forward ) |
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{ |
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m_sample += inputSampleCount; |
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m_absoluteSample += inputSampleCount; |
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} |
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if ( m_loop != 0 && m_sample >= m_loop ) |
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{ |
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SetSamplePosition( m_startpos ); |
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} |
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} |
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if ( sampleCount > 0 ) |
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return false; |
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return true; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: The device calls this to request data. The mixer must provide the |
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// full amount of samples or have silence in its output stream. |
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// Input : *pDevice - requesting device |
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// sampleCount - number of samples at the output rate |
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// outputRate - sampling rate of the request |
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// Output : Returns true to keep mixing, false to delete this mixer |
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//----------------------------------------------------------------------------- |
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bool CAudioMixerWave::MixDataToDevice( IAudioDevice *pDevice, channel_t *pChannel, int startSample, int sampleCount, int outputRate, bool forward /*= true*/ ) |
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{ |
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int offset = 0; |
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int inputSampleRate = (int)(pChannel->pitch * m_pData->Source().SampleRate()); |
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float rate = (float)inputSampleRate / outputRate; |
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fixedint fracstep = FIX_FLOAT( rate ); |
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sampleCount = min( sampleCount, PAINTBUFFER_SIZE ); |
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int startpos = startSample; |
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if ( !forward ) |
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{ |
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int requestedstart = startSample - (int)( sampleCount * rate ); |
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if ( requestedstart < 0 ) |
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return false; |
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startpos = max( 0, requestedstart ); |
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SetSamplePosition( startpos ); |
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} |
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while ( sampleCount > 0 ) |
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{ |
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int availableSamples; |
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int inputSampleCount; |
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char *pData = NULL; |
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int outputSampleCount = sampleCount; |
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if ( outputRate != inputSampleRate ) |
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{ |
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inputSampleCount = (int)(sampleCount * rate); |
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int availableSamples = GetOutputData( (void **)&pData, startpos, inputSampleCount, forward ); |
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if ( !availableSamples ) |
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break; |
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if ( availableSamples < inputSampleCount ) |
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{ |
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outputSampleCount = (int)(availableSamples / rate); |
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inputSampleCount = availableSamples; |
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} |
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Mix( pDevice, pChannel, pData, offset, m_fracOffset, fracstep, outputSampleCount, 0, forward ); |
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// compute new fraction part of sample index |
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float offset = (m_fracOffset / FIX_SCALE) + (rate * outputSampleCount); |
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offset = offset - (float)((int)offset); |
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m_fracOffset = FIX_FLOAT(offset); |
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} |
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else |
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{ |
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availableSamples = GetOutputData( (void **)&pData, startpos, sampleCount, forward ); |
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if ( !availableSamples ) |
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break; |
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outputSampleCount = availableSamples; |
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inputSampleCount = availableSamples; |
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Mix( pDevice, pChannel, pData, offset, m_fracOffset, FIX(1), outputSampleCount, 0, forward ); |
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} |
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offset += outputSampleCount; |
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sampleCount -= outputSampleCount; |
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if ( forward ) |
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{ |
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m_sample += inputSampleCount; |
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m_absoluteSample += inputSampleCount; |
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} |
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if ( m_loop != 0 && m_sample >= m_loop ) |
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{ |
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SetSamplePosition( m_startpos ); |
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} |
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} |
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if ( sampleCount > 0 ) |
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return false; |
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return true; |
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}
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