mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-23 09:36:01 +00:00
74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
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/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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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, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "proc_playaudio.hpp"
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#include "portapack_shared_memory.hpp"
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#include "sine_table.hpp"
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#include <cstdint>
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// This is diry :(
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void PlayAudioProcessor::fill_buffer(int8_t * inptr) {
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memcpy(&audio_fifo[fifo_put], inptr, 1024);
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fifo_put = (fifo_put + 1024) & 0x0FFF;
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asked = false;
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}
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void PlayAudioProcessor::execute(buffer_c8_t buffer) {
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// This is called at 1536000/2048 = 750Hz
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ai = 0;
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for (size_t i = 0; i<buffer.count; i++) {
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// Audio preview sample generation: 1536000/48000 = 32
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if (as >= 31) {
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as = 0;
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sample = audio_fifo[fifo_get];
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preview_audio_buffer.p[ai++] = sample << 8;
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fifo_get = (fifo_get + 1) & 0x0FFF;
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if ((((fifo_put - fifo_get) & 0x0FFF) < 3072) && (asked == false)) {
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// Ask application to fill up fifo
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sigmessage.signaltype = 1;
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shared_memory.application_queue.push(sigmessage);
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asked = true;
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}
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} else {
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as++;
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}
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sample = ((int8_t)audio_fifo[fifo_get] * 4);
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//FM
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frq = sample * 2000;
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phase = (phase + frq);
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sphase = phase + (256<<16);
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re = (sine_table_f32[(sphase & 0x03FF0000)>>18]*127);
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im = (sine_table_f32[(phase & 0x03FF0000)>>18]*127);
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buffer.p[i] = {(int8_t)re,(int8_t)im};
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}
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fill_audio_buffer(preview_audio_buffer);
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}
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