mirror of
https://github.com/sjlongland/atinysynth.git
synced 2025-09-13 10:03:15 +10:00
c19c6dddcb
- Added waveform generic API to create waveforms, and use period instead of frequency in waveform (avoid division on MCUs) - Introduced 'def' struct in ADSR API for reuse - Multi-track MML parser and compilation - Added some samples from https://electronicmusic.fandom.com/wiki/Music_Macro_Language - Added scale.mml for testing
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*!
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* Polyphonic synthesizer for microcontrollers.
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* (C) 2021 Luciano Martorella
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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., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef _SEQUENCER_H
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#define _SEQUENCER_H
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#include "adsr.h"
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#include "waveform.h"
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#include "synth.h"
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/*!
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* Define a single step/frame of the sequencer. It applies to the active channel.
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* Contains the definition of the next waveform and envelope.
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* 16 bytes
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*/
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struct seq_frame_t {
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/*! Envelope definition */
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struct adsr_env_def_t adsr_def;
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/*! Waveform definition */
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struct voice_wf_def_t waveform_def;
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};
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struct seq_stream_header_t {
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/*! Sampling frequency required for correct timing */
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uint16_t synth_frequency;
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/*! Number of voices. They will all be enabled */
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uint8_t voices;
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/*! Total frame count */
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uint16_t frames;
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/*! Follow frames data, as stream of seq_frame_t */
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};
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/*!
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* Plays a stream sequence of frames, in the order requested by the synth.
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* The frames must then be sorted in the same fetch order and not in channel order.
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* Frames will be fed using the handler passed by `seq_set_stream_require_handler`.
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*/
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int seq_play_stream(const struct seq_stream_header_t* stream_header, uint8_t voice_count, struct poly_synth_t* synth);
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/*! Requires a new frame. The handler must return 1 if a new frame was acquired, or zero if EOF */
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void seq_set_stream_require_handler(uint8_t (*handler)(struct seq_frame_t* frame));
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/*! Use it when `seq_play_stream` is in use, must be called at every sample */
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void seq_feed_synth(struct poly_synth_t* synth);
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/*! List of frames, used by `seq_frame_map_t` */
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struct seq_frame_list_t {
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/*! Frame count */
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int count;
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/*! List of frames */
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struct seq_frame_t* frames;
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};
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/*!
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* A frame map is an intermediate data in which frames are organized by channel.
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* Typically requires dynamic memory allocation (heap) to allocate the whole tune
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* upfront.
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*/
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struct seq_frame_map_t {
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/*! Channel count */
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int channel_count;
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/*! Array of frame lists */
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struct seq_frame_list_t* channels;
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};
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/*! Compile/reorder a frame-map (by channel) to a sequential stream */
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void seq_compile(struct seq_frame_map_t* map, struct seq_frame_t** frame_stream, int* frame_count, int* voice_count);
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/*! Free the stream allocated by `seq_compile`. */
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void seq_free(struct seq_frame_t* frame_stream);
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#endif
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