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#include "playback.hpp"
#include "dac.hpp"
#include <cstdint>
#include "audio_element.h"
#include "audio_event_iface.h"
#include "audio_pipeline.h"
#include "driver/i2s.h"
#include "esp_err.h"
#include "freertos/portmacro.h"
#include "mp3_decoder.h"
static const char* kTag = "PLAYBACK";
static const i2s_port_t kI2SPort = I2S_NUM_0;
namespace drivers {
static audio_element_status_t status_from_the_void(void* status) {
uintptr_t as_pointer_int = reinterpret_cast<uintptr_t>(status);
return static_cast<audio_element_status_t>(as_pointer_int);
}
auto DacAudioPlayback::create(AudioDac* dac)
-> cpp::result<std::unique_ptr<DacAudioPlayback>, Error> {
// Ensure we're soft-muted before initialising, in order to reduce protential
// clicks and pops.
dac->WriteVolume(255);
audio_pipeline_handle_t pipeline;
audio_element_handle_t fatfs_stream_reader;
audio_element_handle_t i2s_stream_writer;
audio_event_iface_handle_t event_interface;
audio_pipeline_cfg_t pipeline_config =
audio_pipeline_cfg_t(DEFAULT_AUDIO_PIPELINE_CONFIG());
pipeline = audio_pipeline_init(&pipeline_config);
if (pipeline == NULL) {
return cpp::fail(Error::PIPELINE_INIT);
}
fatfs_stream_cfg_t fatfs_stream_config =
fatfs_stream_cfg_t(FATFS_STREAM_CFG_DEFAULT());
fatfs_stream_config.type = AUDIO_STREAM_READER;
fatfs_stream_reader = fatfs_stream_init(&fatfs_stream_config);
if (fatfs_stream_reader == NULL) {
return cpp::fail(Error::PIPELINE_INIT);
}
i2s_stream_cfg_t i2s_stream_config = i2s_stream_cfg_t{
.type = AUDIO_STREAM_WRITER,
.i2s_config =
{
// static_cast bc esp-adf uses enums incorrectly
.mode = static_cast<i2s_mode_t>(I2S_MODE_MASTER | I2S_MODE_TX),
.sample_rate = 44100,
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
.communication_format = I2S_COMM_FORMAT_STAND_I2S,
.intr_alloc_flags = ESP_INTR_FLAG_LOWMED,
.dma_buf_count = 8,
.dma_buf_len = 64,
.use_apll = false,
.tx_desc_auto_clear = false,
.fixed_mclk = 0,
.mclk_multiple = I2S_MCLK_MULTIPLE_DEFAULT,
.bits_per_chan = I2S_BITS_PER_CHAN_DEFAULT,
},
.i2s_port = kI2SPort,
.use_alc = false,
.volume = 0, // Does nothing; use AudioDac to change this.
.out_rb_size = I2S_STREAM_RINGBUFFER_SIZE,
.task_stack = I2S_STREAM_TASK_STACK,
.task_core = I2S_STREAM_TASK_CORE,
.task_prio = I2S_STREAM_TASK_PRIO,
.stack_in_ext = false,
.multi_out_num = 0,
.uninstall_drv = true,
.need_expand = false,
.expand_src_bits = I2S_BITS_PER_SAMPLE_16BIT,
};
i2s_stream_writer = i2s_stream_init(&i2s_stream_config);
if (i2s_stream_writer == NULL) {
return cpp::fail(Error::PIPELINE_INIT);
}
// NOTE: i2s_stream_init does some additional setup that hardcodes MCK as
// GPIO0. This happens to work fine for us, but be careful if changing.
i2s_pin_config_t pin_config = {.mck_io_num = GPIO_NUM_0,
.bck_io_num = GPIO_NUM_26,
.ws_io_num = GPIO_NUM_27,
.data_out_num = GPIO_NUM_5,
.data_in_num = I2S_PIN_NO_CHANGE};
if (esp_err_t err = i2s_set_pin(kI2SPort, &pin_config) != ESP_OK) {
ESP_LOGE(kTag, "failed to configure i2s pins %x", err);
return cpp::fail(Error::PIPELINE_INIT);
}
// TODO: Create encoders dynamically when we need them.
audio_element_handle_t mp3_decoder;
mp3_decoder_cfg_t mp3_config =
mp3_decoder_cfg_t(DEFAULT_MP3_DECODER_CONFIG());
mp3_decoder = mp3_decoder_init(&mp3_config);
assert(mp3_decoder != NULL);
audio_event_iface_cfg_t event_config = AUDIO_EVENT_IFACE_DEFAULT_CFG();
event_interface = audio_event_iface_init(&event_config);
audio_pipeline_set_listener(pipeline, event_interface);
audio_element_msg_set_listener(fatfs_stream_reader, event_interface);
audio_element_msg_set_listener(mp3_decoder, event_interface);
audio_element_msg_set_listener(i2s_stream_writer, event_interface);
// TODO: most of this is likely post-init, since it involves a decoder.
// All the elements of our pipeline have been initialised. Now switch them
// together.
audio_pipeline_register(pipeline, fatfs_stream_reader, "file");
audio_pipeline_register(pipeline, mp3_decoder, "dec");
audio_pipeline_register(pipeline, i2s_stream_writer, "i2s");
const char* link_tag[3] = {"file", "dec", "i2s"};
audio_pipeline_link(pipeline, &link_tag[0], 3);
return std::make_unique<DacAudioPlayback>(dac, pipeline, fatfs_stream_reader,
i2s_stream_writer, event_interface,
mp3_decoder);
}
DacAudioPlayback::DacAudioPlayback(AudioDac* dac,
audio_pipeline_handle_t pipeline,
audio_element_handle_t fatfs_stream_reader,
audio_element_handle_t i2s_stream_writer,
audio_event_iface_handle_t event_interface,
audio_element_handle_t mp3_decoder)
: dac_(dac),
pipeline_(pipeline),
fatfs_stream_reader_(fatfs_stream_reader),
i2s_stream_writer_(i2s_stream_writer),
event_interface_(event_interface),
mp3_decoder_(mp3_decoder) {}
DacAudioPlayback::~DacAudioPlayback() {
dac_->WriteVolume(255);
audio_pipeline_remove_listener(pipeline_);
audio_element_msg_remove_listener(fatfs_stream_reader_, event_interface_);
audio_element_msg_remove_listener(mp3_decoder_, event_interface_);
audio_element_msg_remove_listener(i2s_stream_writer_, event_interface_);
audio_pipeline_stop(pipeline_);
audio_pipeline_wait_for_stop(pipeline_);
audio_pipeline_terminate(pipeline_);
audio_pipeline_unregister(pipeline_, fatfs_stream_reader_);
audio_pipeline_unregister(pipeline_, mp3_decoder_);
audio_pipeline_unregister(pipeline_, i2s_stream_writer_);
audio_event_iface_destroy(event_interface_);
audio_pipeline_deinit(pipeline_);
audio_element_deinit(fatfs_stream_reader_);
audio_element_deinit(i2s_stream_writer_);
audio_element_deinit(mp3_decoder_);
}
void DacAudioPlayback::Play(const std::string& filename) {
dac_->WriteVolume(255);
// TODO: handle reconfiguring the pipeline if needed.
audio_element_set_uri(fatfs_stream_reader_, filename.c_str());
audio_pipeline_run(pipeline_);
dac_->WriteVolume(volume_);
}
void DacAudioPlayback::Resume() {
// TODO.
}
void DacAudioPlayback::Pause() {
// TODO.
}
void DacAudioPlayback::ProcessEvents() {
while (1) {
audio_event_iface_msg_t event;
esp_err_t err =
audio_event_iface_listen(event_interface_, &event, portMAX_DELAY);
if (err != ESP_OK) {
ESP_LOGI(kTag, "error listening for event:%x", err);
continue;
}
ESP_LOGI(kTag, "received event, cmd %i", event.cmd);
if (event.source_type == AUDIO_ELEMENT_TYPE_ELEMENT &&
event.source == (void*)mp3_decoder_ &&
event.cmd == AEL_MSG_CMD_REPORT_MUSIC_INFO) {
audio_element_info_t music_info;
audio_element_getinfo(mp3_decoder_, &music_info);
ESP_LOGI(kTag, "sample_rate=%d, bits=%d, ch=%d", music_info.sample_rates,
music_info.bits, music_info.channels);
audio_element_setinfo(i2s_stream_writer_, &music_info);
i2s_stream_set_clk(i2s_stream_writer_, music_info.sample_rates,
music_info.bits, music_info.channels);
}
if (event.source_type == AUDIO_ELEMENT_TYPE_ELEMENT &&
event.source == (void*)fatfs_stream_reader_ &&
event.cmd == AEL_MSG_CMD_REPORT_STATUS) {
audio_element_status_t status = status_from_the_void(event.data);
if (status == AEL_STATUS_STATE_FINISHED) {
// TODO: enqueue next track?
}
}
if (event.source_type == AUDIO_ELEMENT_TYPE_ELEMENT &&
event.source == (void*)i2s_stream_writer_ &&
event.cmd == AEL_MSG_CMD_REPORT_STATUS) {
audio_element_status_t status = status_from_the_void(event.data);
if (status == AEL_STATUS_STATE_FINISHED) {
// TODO.
return;
}
}
if (event.need_free_data) {
ESP_LOGI(kTag, "freeing event data");
free(event.data);
}
}
}
/* for gapless */
void DacAudioPlayback::set_next_file(const std::string& filename) {
next_filename_ = filename;
}
void DacAudioPlayback::set_volume(uint8_t volume) {
volume_ = volume;
// TODO: don't write immediately if we're muting to change track or similar.
dac_->WriteVolume(volume);
}
auto DacAudioPlayback::volume() -> uint8_t {
return volume_;
}
} // namespace drivers
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