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/***************************************************************************
mixer.cpp - Sids Mixer Routines
-------------------
begin : Sun Jul 9 2000
copyright : (C) 2000 by Simon White
email : s_a_white@email.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/***************************************************************************
* $Log: mixer.cpp,v $
* Revision 1.10 2002/01/29 21:50:33 s_a_white
* Auto switching to a better emulation mode. m_tuneInfo reloaded after a
* config. Initial code added to support more than two sids.
*
* Revision 1.9 2001/12/13 08:28:08 s_a_white
* Added namespace support to fix problems with xsidplay.
*
* Revision 1.8 2001/11/16 19:25:33 s_a_white
* Removed m_context as where getting mixed with parent class.
*
* Revision 1.7 2001/10/02 18:29:32 s_a_white
* Corrected fixed point maths overflow caused by fastforwarding.
*
* Revision 1.6 2001/09/17 19:02:38 s_a_white
* Now uses fixed point maths for sample output and rtc.
*
* Revision 1.5 2001/07/25 17:02:37 s_a_white
* Support for new configuration interface.
*
* Revision 1.4 2001/07/14 12:47:39 s_a_white
* Mixer routines simplified. Added new and more efficient method of
* determining when an output samples is required.
*
* Revision 1.3 2001/03/01 23:46:37 s_a_white
* Support for sample mode to be selected at runtime.
*
* Revision 1.2 2000/12/12 22:50:15 s_a_white
* Bug Fix #122033.
*
***************************************************************************/
#include "player.h"
#include "sidendian.h"
const int_least32_t VOLUME_MAX = 255;
SIDPLAY2_NAMESPACE_START
void Player::mixerReset (void)
{ // Fixed point 16.16
m_sampleClock = m_samplePeriod & 0x0FFFF;
// Schedule next sample event
(context ()).schedule (&mixerEvent,
m_samplePeriod >> 24);
}
void Player::mixer (void)
{ // Fixed point 16.16
event_clock_t cycles;
char *buf = m_sampleBuffer + m_sampleIndex;
m_sampleClock += m_samplePeriod;
cycles = m_sampleClock >> 16;
m_sampleClock &= 0x0FFFF;
m_sampleIndex += (this->*output) (buf);
// Schedule next sample event
(context ()).schedule (&mixerEvent, cycles);
// Filled buffer
if (m_sampleIndex >= m_sampleCount)
m_running = false;
}
//-------------------------------------------------------------------------
// Generic sound output generation routines
//-------------------------------------------------------------------------
inline
int_least32_t Player::monoOutGenericLeftIn (uint_least8_t bits)
{
return sid[0]->output (bits) * m_leftVolume / VOLUME_MAX;
}
inline
int_least32_t Player::monoOutGenericStereoIn (uint_least8_t bits)
{
// Convert to mono
return ((sid[0]->output (bits) * m_leftVolume) +
(sid[1]->output (bits) * m_rightVolume)) / (VOLUME_MAX * 2);
}
inline
int_least32_t Player::monoOutGenericRightIn (uint_least8_t bits)
{
return sid[1]->output (bits) * m_rightVolume / VOLUME_MAX;
}
//-------------------------------------------------------------------------
// 8 bit sound output generation routines
//-------------------------------------------------------------------------
uint_least32_t Player::monoOut8MonoIn (char *buffer)
{
*buffer = (char) monoOutGenericLeftIn (8) ^ '\x80';
return sizeof (char);
}
uint_least32_t Player::monoOut8StereoIn (char *buffer)
{
*buffer = (char) monoOutGenericStereoIn (8) ^ '\x80';
return sizeof (char);
}
uint_least32_t Player::monoOut8StereoRIn (char *buffer)
{
*buffer = (char) monoOutGenericRightIn (8) ^ '\x80';
return sizeof (char);
}
uint_least32_t Player::stereoOut8MonoIn (char *buffer)
{
char sample = (char) monoOutGenericLeftIn (8) ^ '\x80';
buffer[0] = sample;
buffer[1] = sample;
return (2 * sizeof (char));
}
uint_least32_t Player::stereoOut8StereoIn (char *buffer)
{
buffer[0] = (char) monoOutGenericLeftIn (8) ^ '\x80';
buffer[1] = (char) monoOutGenericRightIn (8) ^ '\x80';
return (2 * sizeof (char));
}
//-------------------------------------------------------------------------
// 16 bit sound output generation routines
//-------------------------------------------------------------------------
uint_least32_t Player::monoOut16MonoIn (char *buffer)
{
endian_16 (buffer, (uint_least16_t) monoOutGenericLeftIn (16));
return sizeof (uint_least16_t);
}
uint_least32_t Player::monoOut16StereoIn (char *buffer)
{
endian_16 (buffer, (uint_least16_t) monoOutGenericStereoIn (16));
return sizeof (uint_least16_t);
}
uint_least32_t Player::monoOut16StereoRIn (char *buffer)
{
endian_16 (buffer, (uint_least16_t) monoOutGenericRightIn (16));
return sizeof (uint_least16_t);
}
uint_least32_t Player::stereoOut16MonoIn (char *buffer)
{
uint_least16_t sample = (uint_least16_t) monoOutGenericLeftIn (16);
endian_16 (buffer, sample);
endian_16 (buffer + sizeof(uint_least16_t), sample);
return (2 * sizeof (uint_least16_t));
}
uint_least32_t Player::stereoOut16StereoIn (char *buffer)
{
endian_16 (buffer, (uint_least16_t) monoOutGenericLeftIn (16));
endian_16 (buffer + sizeof(uint_least16_t),
(uint_least16_t) monoOutGenericRightIn (16));
return (2 * sizeof (uint_least16_t));
}
SIDPLAY2_NAMESPACE_STOP
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