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- /* Audio Library for Teensy 3.X
- * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
- *
- * Development of this audio library was funded by PJRC.COM, LLC by sales of
- * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
- * open source software by purchasing Teensy or other PJRC products.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice, development funding notice, and this permission
- * notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
- #ifndef effect_fade_h_
- #define effect_fade_h_
-
- #include <core/Arduino.h>
- #include <core/AudioStream.h>
-
- class AudioEffectFade : public AudioStream
- {
- public:
- AudioEffectFade(void)
- : AudioStream(1, inputQueueArray), position(0xFFFFFFFF) {}
- void fadeIn(uint32_t milliseconds) {
- uint32_t samples = (uint32_t)(milliseconds * 441u + 5u) / 10u;
- //Serial.printf("fadeIn, %u samples\n", samples);
- fadeBegin(0xFFFFFFFFu / samples, 1);
- }
- void fadeOut(uint32_t milliseconds) {
- uint32_t samples = (uint32_t)(milliseconds * 441u + 5u) / 10u;
- //Serial.printf("fadeOut, %u samples\n", samples);
- fadeBegin(0xFFFFFFFFu / samples, 0);
- }
- virtual void update(void);
- private:
- void fadeBegin(uint32_t newrate, uint8_t dir);
- uint32_t position; // 0 = off, 0xFFFFFFFF = on
- uint32_t rate;
- uint8_t direction; // 0 = fading out, 1 = fading in
- audio_block_t *inputQueueArray[1];
- };
-
- #endif
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