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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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#ifndef __LS_EVENT_H__ |
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#define __LS_EVENT_H__ |
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#include "../../common/global.h" |
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namespace LinuxSampler { |
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// just symbol prototyping |
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class Event; |
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/** |
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* Generates Event objects and is responsible for resolving the position |
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* in the current audio fragment each Event actually belongs to. |
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*/ |
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class EventGenerator { |
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public: |
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EventGenerator(uint SampleRate); |
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void UpdateFragmentTime(uint SamplesToProcess); |
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Event CreateEvent(); |
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protected: |
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typedef uint32_t time_stamp_t; ///< We read the processor's cycle count register as a reference for the real time. These are of course only abstract values with arbitrary time entity, but that's not a problem as we calculate relatively. |
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inline uint ToFragmentPos(time_stamp_t TimeStamp) { |
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return uint ((TimeStamp - FragmentTime.begin) * FragmentTime.sample_ratio); |
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} |
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friend class Event; |
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private: |
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uint uiSampleRate; |
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uint uiSamplesProcessed; |
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struct __FragmentTime__ { |
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time_stamp_t begin; ///< Real time stamp of the beginning of this audio fragment cycle. |
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time_stamp_t end; ///< Real time stamp of the end of this audio fragment cycle. |
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float sample_ratio; ///< (Samples per cycle) / (Real time duration of cycle) |
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} FragmentTime; |
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time_stamp_t CreateTimeStamp(); |
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}; |
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/** |
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* Events are usually caused by a MIDI source or an internal modulation |
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* controller like LFO or EG. An event can only be created by an |
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* EventGenerator. |
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* |
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* @see EventGenerator |
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*/ |
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class Event { |
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public: |
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Event(){} |
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enum type_t { |
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type_note_on, |
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type_note_off, |
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type_pitchbend, |
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type_control_change, |
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type_sysex, ///< MIDI system exclusive message |
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type_cancel_release, ///< transformed either from a note-on or sustain-pedal-down event |
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type_release ///< transformed either from a note-off or sustain-pedal-up event |
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} Type; |
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enum destination_t { |
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destination_vca, ///< Volume level |
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destination_vco, ///< Pitch depth |
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destination_vcfc, ///< Filter curoff frequency |
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destination_vcfr, ///< Filter resonance |
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destination_count ///< Total number of modulation destinations (this has to stay the last element in the enum) |
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}; |
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union { |
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/// Note-on and note-off event specifics |
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struct _Note { |
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uint8_t Key; ///< MIDI key number of note-on / note-off event. |
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uint8_t Velocity; ///< Trigger or release velocity of note-on / note-off event. |
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int8_t Layer; ///< Layer index (usually only used if a note-on event has to be postponed, e.g. due to shortage of free voices). |
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int8_t ReleaseTrigger; ///< If new voice should be a release triggered voice (actually boolean field and usually only used if a note-on event has to be postponed, e.g. due to shortage of free voices). |
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} Note; |
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/// Control change event specifics |
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struct _CC { |
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uint8_t Controller; ///< MIDI controller number of control change event. |
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uint8_t Value; ///< Controller Value of control change event. |
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} CC; |
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/// Pitchbend event specifics |
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struct _Pitch { |
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int16_t Pitch; ///< Pitch value of pitchbend event. |
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} Pitch; |
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/// MIDI system exclusive event specifics |
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struct _Sysex { |
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uint Size; ///< Data length (in bytes) of MIDI system exclusive message. |
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} Sysex; |
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} Param; |
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inline uint FragmentPos() { |
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if (iFragmentPos >= 0) return (uint) iFragmentPos; |
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return (uint) (iFragmentPos = pEventGenerator->ToFragmentPos(TimeStamp)); |
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} |
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protected: |
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typedef EventGenerator::time_stamp_t time_stamp_t; |
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Event(EventGenerator* pGenerator, EventGenerator::time_stamp_t Time); |
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friend class EventGenerator; |
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private: |
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EventGenerator* pEventGenerator; ///< Creator of the event. |
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time_stamp_t TimeStamp; ///< Time stamp of the event's occurence. |
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int iFragmentPos; ///< Position in the current fragment this event refers to. |
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}; |
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} // namespace LinuxSampler |
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#endif // __LS_EVENT_H__ |