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esp32_audio_task.h
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esp32_audio_task.h
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#include "driver/i2s.h"
#include "AACDecoderHelix.h"
#include "MP3DecoderHelix.h"
static unsigned long total_read_audio_ms = 0;
static unsigned long total_decode_audio_ms = 0;
static unsigned long total_play_audio_ms = 0;
static i2s_port_t _i2s_num;
static esp_err_t i2s_init(i2s_port_t i2s_num, uint32_t sample_rate,
int mck_io_num, /*!< MCK in out pin. Note that ESP32 supports setting MCK on GPIO0/GPIO1/GPIO3 only*/
int bck_io_num, /*!< BCK in out pin*/
int ws_io_num, /*!< WS in out pin*/
int data_out_num, /*!< DATA out pin*/
int data_in_num /*!< DATA in pin*/
)
{
_i2s_num = i2s_num;
esp_err_t ret_val = ESP_OK;
i2s_config_t i2s_config;
i2s_config.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX);
i2s_config.sample_rate = sample_rate;
i2s_config.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT;
i2s_config.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT;
i2s_config.communication_format = I2S_COMM_FORMAT_STAND_I2S;
i2s_config.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1;
i2s_config.dma_buf_count = 8;
i2s_config.dma_buf_len = 160;
i2s_config.use_apll = false;
i2s_config.tx_desc_auto_clear = true;
i2s_config.fixed_mclk = 0;
i2s_config.mclk_multiple = I2S_MCLK_MULTIPLE_DEFAULT;
i2s_config.bits_per_chan = I2S_BITS_PER_CHAN_16BIT;
i2s_pin_config_t pin_config;
pin_config.mck_io_num = mck_io_num;
pin_config.bck_io_num = bck_io_num;
pin_config.ws_io_num = ws_io_num;
pin_config.data_out_num = data_out_num;
pin_config.data_in_num = data_in_num;
ret_val |= i2s_driver_install(i2s_num, &i2s_config, 0, NULL);
ret_val |= i2s_set_pin(i2s_num, &pin_config);
return ret_val;
}
static int _samprate = 0;
static void aacAudioDataCallback(AACFrameInfo &info, int16_t *pwm_buffer, size_t len)
{
unsigned long s = millis();
if (_samprate != info.sampRateOut)
{
// log_i("bitRate: %d, nChans: %d, sampRateCore: %d, sampRateOut: %d, bitsPerSample: %d, outputSamps: %d, profile: %d, tnsUsed: %d, pnsUsed: %d",
// info.bitRate, info.nChans, info.sampRateCore, info.sampRateOut, info.bitsPerSample, info.outputSamps, info.profile, info.tnsUsed, info.pnsUsed);
i2s_set_clk(_i2s_num, info.sampRateOut /* sample_rate */, info.bitsPerSample /* bits_cfg */, (info.nChans == 2) ? I2S_CHANNEL_STEREO : I2S_CHANNEL_MONO /* channel */);
_samprate = info.sampRateOut;
}
size_t i2s_bytes_written = 0;
i2s_write(_i2s_num, pwm_buffer, len * 2, &i2s_bytes_written, portMAX_DELAY);
// log_i("len: %d, i2s_bytes_written: %d", len, i2s_bytes_written);
total_play_audio_ms += millis() - s;
}
static void mp3AudioDataCallback(MP3FrameInfo &info, int16_t *pwm_buffer, size_t len)
{
unsigned long s = millis();
if (_samprate != info.samprate)
{
log_i("bitrate: %d, nChans: %d, samprate: %d, bitsPerSample: %d, outputSamps: %d, layer: %d, version: %d",
info.bitrate, info.nChans, info.samprate, info.bitsPerSample, info.outputSamps, info.layer, info.version);
i2s_set_clk(_i2s_num, info.samprate /* sample_rate */, info.bitsPerSample /* bits_cfg */, (info.nChans == 2) ? I2S_CHANNEL_STEREO : I2S_CHANNEL_MONO /* channel */);
_samprate = info.samprate;
}
size_t i2s_bytes_written = 0;
i2s_write(_i2s_num, pwm_buffer, len * 2, &i2s_bytes_written, portMAX_DELAY);
// log_i("len: %d, i2s_bytes_written: %d", len, i2s_bytes_written);
total_play_audio_ms += millis() - s;
}
static uint8_t _frame[MP3_MAX_FRAME_SIZE]; // MP3_MAX_FRAME_SIZE is smaller, so always use MP3_MAX_FRAME_SIZE
static bool keep_playing = true;
static libhelix::AACDecoderHelix _aac(aacAudioDataCallback);
static void aac_player_task(void *pvParam)
{
Stream *input = (Stream *)pvParam;
int r, w;
unsigned long ms = millis();
while ((keep_playing) && (r = input->readBytes(_frame, MP3_MAX_FRAME_SIZE)))
{
total_read_audio_ms += millis() - ms;
ms = millis();
while (r > 0)
{
w = _aac.write(_frame, r);
// log_i("r: %d, w: %d\n", r, w);
r -= w;
}
total_decode_audio_ms += millis() - ms;
ms = millis();
}
_aac.end()
log_i("AAC stop.");
vTaskDelete(NULL);
}
static libhelix::MP3DecoderHelix _mp3(mp3AudioDataCallback);
static void mp3_player_task(void *pvParam)
{
Stream *input = (Stream *)pvParam;
int r, w;
unsigned long ms = millis();
while ((keep_playing) && (r = input->readBytes(_frame, MP3_MAX_FRAME_SIZE)))
{
total_read_audio_ms += millis() - ms;
ms = millis();
while (r > 0)
{
w = _mp3.write(_frame, r);
// log_i("r: %d, w: %d\n", r, w);
r -= w;
}
total_decode_audio_ms += millis() - ms;
ms = millis();
}
_mp3.end();
log_i("MP3 stop.");
vTaskDelete(NULL);
}
static BaseType_t aac_player_task_start(Stream *input, BaseType_t audioAssignCore)
{
keep_playing = true;
_aac.begin();
return xTaskCreatePinnedToCore(
(TaskFunction_t)aac_player_task,
(const char *const)"AAC Player Task",
(const uint32_t)2000,
(void *const)input,
(UBaseType_t)configMAX_PRIORITIES - 1,
(TaskHandle_t *const)NULL,
(const BaseType_t)audioAssignCore);
}
static BaseType_t mp3_player_task_start(Stream *input, BaseType_t audioAssignCore)
{
keep_playing = true;
_mp3.begin();
return xTaskCreatePinnedToCore(
(TaskFunction_t)mp3_player_task,
(const char *const)"MP3 Player Task",
(const uint32_t)2000,
(void *const)input,
(UBaseType_t)configMAX_PRIORITIES - 1,
(TaskHandle_t *const)NULL,
(const BaseType_t)audioAssignCore);
}
static void mp3_player_task_stop()
{
keep_playing = false;
// wait _mp3 inactive
while (_mp3)
{
delay(10);
}
}
static void aac_player_task_stop()
{
keep_playing = false;
// wait _mp3 inactive
while (_mp3)
{
delay(10);
}
}