squeezelite-esp32/components/spotify/cspot/bell/main/audio-sinks/esp/InternalAudioSink.cpp

#include "InternalAudioSink.h"
#include "driver/i2s.h"

InternalAudioSink::InternalAudioSink()
{
    softwareVolumeControl = true;
    usign = true;
    #ifdef I2S_MODE_DAC_BUILT_IN

    i2s_config_t i2s_config = {
        .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),                                  // Only TX
        .sample_rate = (i2s_bits_per_sample_t)44100,
        .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
        .communication_format = (i2s_comm_format_t)I2S_COMM_FORMAT_STAND_I2S,
        .intr_alloc_flags = 0,//ESP_INTR_FLAG_LEVEL1
        .dma_buf_count = 6,
        .dma_buf_len = 512,
        .use_apll = true,
        .tx_desc_auto_clear = true, //Auto clear tx descriptor on underflow
        .fixed_mclk=-1
    };

    //install and start i2s driver
    i2s_driver_install((i2s_port_t)0, &i2s_config, 0, NULL);
    //init DAC
    i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN);
    #endif

    startI2sFeed();
}

InternalAudioSink::~InternalAudioSink()
{
}