77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/*
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AudioOutputSPDIF
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S/PDIF output via I2S
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Needs transceiver from CMOS level to either optical or coaxial interface
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See: https://www.epanorama.net/documents/audio/spdif.html
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Original idea and sources:
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Forum thread discussing implementation
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https://forum.pjrc.com/threads/28639-S-pdif
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Teensy Audio Library
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https://github.com/PaulStoffregen/Audio/blob/master/output_spdif2.cpp
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Adapted for ESP8266Audio
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Copyright (C) 2020 Ivan Kostoski
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined(ESP32) || defined(ESP8266)
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#pragma once
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#include "AudioOutput.h"
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#if defined(ESP32)
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#define SPDIF_OUT_PIN_DEFAULT 27
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#define DMA_BUF_COUNT_DEFAULT 8
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#define DMA_BUF_SIZE_DEFAULT 256
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#elif defined(ESP8266)
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#define SPDIF_OUT_PIN_DEFAULT 3
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#define DMA_BUF_COUNT_DEFAULT 32
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#define DMA_BUF_SIZE_DEFAULT 64
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#endif
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class AudioOutputSPDIF : public AudioOutput
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{
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public:
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AudioOutputSPDIF(int dout_pin=SPDIF_OUT_PIN_DEFAULT, int port=0, int dma_buf_count = DMA_BUF_COUNT_DEFAULT);
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virtual ~AudioOutputSPDIF() override;
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bool SetPinout(int bclkPin, int wclkPin, int doutPin);
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virtual bool SetRate(int hz) override;
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virtual bool SetBitsPerSample(int bits) override;
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virtual bool SetChannels(int channels) override;
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virtual bool begin() override;
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virtual bool ConsumeSample(int16_t sample[2]) override;
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virtual bool stop() override;
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bool SetOutputModeMono(bool mono); // Force mono output no matter the input
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const uint32_t VUCP_PREAMBLE_B = 0xCCE80000; // 11001100 11101000
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const uint32_t VUCP_PREAMBLE_M = 0xCCE20000; // 11001100 11100010
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const uint32_t VUCP_PREAMBLE_W = 0xCCE40000; // 11001100 11100100
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protected:
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virtual inline int AdjustI2SRate(int hz) { return rate_multiplier * hz; }
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uint8_t portNo;
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bool mono;
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bool i2sOn;
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uint8_t frame_num;
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uint8_t rate_multiplier;
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};
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#endif // _AUDIOOUTPUTSPDIF_H
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