Espressif ESP32-LyraT Docs Template Documentation page 77

3.3.2 Design Components
Five basic components are - Audio Element, Audio Event, Audio Pipeline, ESP peripherals, ESP audio
Audio Element
Example
audio_element_handle_t el;
audio_element_cfg_t cfg
cfg.open = _el_open;
cfg.read = _el_read;
cfg.process = _el_process;
cfg.write = _el_write;
cfg.close = _el_close;
el = audio_element_init(&cfg);
TEST_ASSERT_NOT_NULL(el);
TEST_ASSERT_EQUAL(ESP_OK, audio_element_start(el));
Audio Event
Example
audio_event_handle_t evt1;
audio_event_cfg_t cfg
cfg.dispatcher = evt_process;
cfg.queue_size = 10;
cfg.context = &evt1;
cfg.type = AUDIO_EVENT_TYPE_ELEMENT;
evt1 = audio_event_init(&cfg);
TEST_ASSERT_NOT_NULL(evt1);
audio_event_msg_t msg;
int i;
ESP_LOGI(TAG, "[ ] dispatch 10 msg to
for (i = 0; i < 10; i++) {
msg.cmd = i;
TEST_ASSERT_EQUAL(ESP_OK, audio_event_dispatch(evt1, &msg));
}
msg.cmd = 10;
TEST_ASSERT_EQUAL(ESP_FAIL, audio_event_dispatch(evt1, &msg));
ESP_LOGI(TAG, "[ ] listening 10 event have dispatched fron
while (audio_event_listen(evt1)
Audio Pipeline
Example
audio_element_handle_t first_el, mid_el, last_el;
audio_element_cfg_t el_cfg
3.3. Software Design
= DEFAULT_AUDIO_ELEMENT_CONFIG();
= AUDIO_EVENT_IFACE_DEFAULT_CFG();
evt1");
== ESP_OK);
= DEFAULT_AUDIO_ELEMENT_CONFIG();
Read the Docs Template Documentation, Release
evt1");
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