esp_log_level_set(“*”, ESP_LOG_WARN);

esp_log_level_set(TAG, ESP_LOG_INFO);

ESP_LOGI(TAG, “[ 1 ] Start audio codec chip”);

audio_hal_codec_config_t audio_hal_codec_cfg = AUDIO_HAL_ES8388_DEFAULT();

audio_hal_handle_t hal = audio_hal_init(&audio_hal_codec_cfg, 0); // 初始化编解码驱动

audio_hal_ctrl_codec(hal, AUDIO_HAL_CODEC_MODE_DECODE, AUDIO_HAL_CTRL_START); // 启动解码

int player_volume;

audio_hal_get_volume(hal, &player_volume); // 获取音量

ESP_LOGI(TAG, “[ 2 ] Create audio pipeline, add all elements to pipeline, and subscribe pipeline event”);

audio_pipeline_cfg_t pipeline_cfg = DEFAULT_AUDIO_PIPELINE_CONFIG();

pipeline = audio_pipeline_init(&pipeline_cfg); // 初始化管道

mem_assert(pipeline);

ESP_LOGI(TAG, “[2.1] Create mp3 decoder to decode mp3 file and set custom read callback”);

mp3_decoder_cfg_t mp3_cfg = DEFAULT_MP3_DECODER_CONFIG();

mp3_decoder = mp3_decoder_init(&mp3_cfg); // 初始化mp3 decoder元素

audio_element_set_read_cb(mp3_decoder, mp3_music_read_cb, NULL);

ESP_LOGI(TAG, “[2.2] Create i2s stream to write data to codec chip”);

i2s_stream_cfg_t i2s_cfg = I2S_STREAM_CFG_DEFAULT();

i2s_cfg.type = AUDIO_STREAM_WRITER;

i2s_stream_writer = i2s_stream_init(&i2s_cfg); // 初始化i2s stream元素

ESP_LOGI(TAG, “[2.3] Register all elements to audio pipeline”); // 注册元素到管道中去

audio_pipeline_register(pipeline, mp3_decoder, “mp3”);

audio_pipeline_register(pipeline, i2s_stream_writer, “i2s”);

ESP_LOGI(TAG, “[2.4] Link it together [mp3_music_read_cb]–>mp3_decoder–>i2s_stream–>[codec_chip]”);

audio_pipeline_link(pipeline, (const char *[]) {“mp3”, “i2s”}, 2); // 将mp3_music_read_cb mp3_decoder i2s_stream codec_chip关联在一起

ESP_LOGI(TAG, “[ 3 ] Initialize peripherals”);

esp_periph_config_t periph_cfg = { 0 };

esp_periph_init(&periph_cfg);

ESP_LOGI(TAG, “[3.1] Initialize Touch peripheral”);

periph_touch_cfg_t touch_cfg = {

.touch_mask = TOUCH_SEL_SET | TOUCH_SEL_PLAY | TOUCH_SEL_VOLUP | TOUCH_SEL_VOLDWN,

.tap_threshold_percent = 70,

};

esp_periph_handle_t touch_periph = periph_touch_init(&touch_cfg); // 初始化按键

ESP_LOGI(TAG, “[3.2] Start all peripherals”);

esp_periph_start(touch_periph);

ESP_LOGI(TAG, “[ 4 ] Setup event listener”);

audio_event_iface_cfg_t evt_cfg = AUDIO_EVENT_IFACE_DEFAULT_CFG();

audio_event_iface_handle_t evt = audio_event_iface_init(&evt_cfg);

ESP_LOGI(TAG, “[4.1] Listening event from all elements of pipeline”);

audio_pipeline_set_listener(pipeline, evt); // 设置按键事件

ESP_LOGI(TAG, “[4.2] Listening event from peripherals”); // 设置外设监听事件

audio_event_iface_set_listener(esp_periph_get_event_iface(), evt);

ESP_LOGW(TAG, “[ 5 ] Tap touch buttons to control music player:”);

ESP_LOGW(TAG, " [Play] to start, pause and resume, [Set] to stop.");

ESP_LOGW(TAG, " [Vol-] or [Vol+] to adjust volume.");

while (1) {

audio_event_iface_msg_t msg;

esp_err_t ret = audio_event_iface_listen(evt, &msg, portMAX_DELAY);

if (ret != ESP_OK) {

ESP_LOGE(TAG, “[ * ] Event interface error : %d”, ret);

continue;

}

if (msg.source_type == AUDIO_ELEMENT_TYPE_ELEMENT && msg.source == (void *) mp3_decoder

&& msg.cmd == AEL_MSG_CMD_REPORT_MUSIC_INFO) {

audio_element_info_t music_info = {0};

audio_element_getinfo(mp3_decoder, &music_info);

ESP_LOGI(TAG, “[ * ] Receive music info from mp3 decoder, sample_rates=%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);

continue;

}

if (msg.source_type == PERIPH_ID_TOUCH

&& msg.cmd == PERIPH_TOUCH_TAP

&& msg.source == (void *)touch_periph) {

if ((int) msg.data == TOUCH_PLAY) { // 改变播放状态

ESP_LOGI(TAG, “[ * ] [Play] touch tap event”);

audio_element_state_t el_state = audio_element_get_state(i2s_stream_writer);

switch (el_state) {

case AEL_STATE_INIT :

ESP_LOGI(TAG, “[ * ] Starting audio pipeline”);

audio_pipeline_run(pipeline);

break;

case AEL_STATE_RUNNING :

ESP_LOGI(TAG, “[ * ] Pausing audio pipeline”);

audio_pipeline_pause(pipeline);

break;

case AEL_STATE_PAUSED :

ESP_LOGI(TAG, “[ * ] Resuming audio pipeline”);

audio_pipeline_resume(pipeline);

break;

case AEL_STATE_FINISHED :

ESP_LOGI(TAG, “[ * ] Rewinding audio pipeline”);

audio_pipeline_stop(pipeline);

adf_music_mp3_pos = 0;

audio_pipeline_resume(pipeline);

break;

default :

ESP_LOGI(TAG, “[ * ] Not supported state %d”, el_state);

}

} else if ((int) msg.data == TOUCH_SET) {

ESP_LOGI(TAG, “[ * ] [Set] touch tap event”);

ESP_LOGI(TAG, “[ * ] Stopping audio pipeline”);

break;

} else if ((int) msg.data ==

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TOUCH_VOLUP) {

ESP_LOGI(TAG, “[ * ] [Vol+] touch tap event”);

player_volume += 10;

if (player_volume > 100) {

player_volume = 100;

}

audio_hal_set_volume(hal, player_volume);

ESP_LOGI(TAG, “[ * ] Volume set to %d %%”, player_volume);

} else if ((int) msg.data == TOUCH_VOLDWN) {

ESP_LOGI(TAG, “[ * ] [Vol-] touch tap event”);

player_volume -= 10;

if (player_volume < 0) {

player_volume = 0;

}

audio_hal_set_volume(hal, player_volume);

ESP_LOGI(TAG, “[ * ] Volume set to %d %%”, player_volume);

}

}

}

ESP_LOGI(TAG, “[ 6 ] Stop audio_pipeline”);

audio_pipeline_terminate(pipeline);

audio_pipeline_unregister(pipeline, mp3_decoder);

audio_pipeline_unregister(pipeline, i2s_stream_writer);

/* Terminate the pipeline before removing the listener */

audio_pipeline_remove_listener(pipeline);

/* Make sure audio_pipeline_remove_listener is called before destroying event_iface */

audio_event_iface_destroy(evt);

/* Release all resources */

audio_pipeline_deinit(pipeline);

audio_element_deinit(i2s_stream_writer);

audio_element_deinit(mp3_decoder);

}

相信大多数从事Android开发的朋友们越来越发现，找工作越来越难了，面试的要求越来越高了

除了基础扎实的java知识，数据结构算法，设计模式还要求会底层源码，NDK技术，性能调优，还有会些小程序和跨平台，比如说flutter，以思维脑图的方式展示在下图；

本文已被 CODING开源项目：《Android学习笔记总结+移动架构视频+大厂面试真题+项目实战源码》收录

版权声明 本文为[mb619a1115cf5a5]所创，转载请带上原文链接，感谢 https://blog.51cto.com/u_15439113/4702982