diff options
Diffstat (limited to 'sid/sidplay-libs-2.1.0/libsidplay/src/mixer.cpp')
| -rw-r--r-- | sid/sidplay-libs-2.1.0/libsidplay/src/mixer.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/sid/sidplay-libs-2.1.0/libsidplay/src/mixer.cpp b/sid/sidplay-libs-2.1.0/libsidplay/src/mixer.cpp new file mode 100644 index 00000000..c7703dc1 --- /dev/null +++ b/sid/sidplay-libs-2.1.0/libsidplay/src/mixer.cpp @@ -0,0 +1,180 @@ +/*************************************************************************** + 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 |