ESP Multi-Room Music 方案：支持音频实时同步播放 实现音乐互联共享

项目背景

随着无线通信技术的发展，针对不同音频应用领域的无线音频产品正不断涌现。近日，乐鑫科技推出了基于 Wi-Fi 的多扬声器互联共享音乐通信协议——ESP Multi-Room Music 方案。该方案使用乐鑫自研的基于 Wi-Fi 局域网的音频同步播放技术，支持音频设备间低延时自动校准，打造影院级立体声环绕系统。该方案具有以下优势：

• 影院级立体声环绕系统： 可居家轻松构建影院级的立体声环绕系统，升级家庭影音系统，感受高质量的澎湃声音体验。
• 低延时自校准：ESP Multi-Room Music 方案支持自动低延时校准，确保在不同位置的所有扬声器声音同步。
• DIY 环绕效果：支持用户自定义多设备之间的组网以及环绕效果，可以根据用户的居家环境和喜好，实现对音箱的智能 DIY 群组控制。
• 多播放来源：支持来自媒资云端、手机设备、本地 AUX等输入方式，可随时随地构建设备协同播放场景。
• 稳定性和可靠性：基于局域网 Wi-Fi 技术，提供稳定、可靠的音频数据传输，让用户的音频体验更加流畅。
• 易于安装和使用：无需复杂的设置过程，用户即可轻松安装和使用。同时摆脱繁琐的信号线缆，使空间更加整洁。

观看视频了解 ESP Multi-Room Music 方案。

ESP 音乐互联共享【超酷】

ESP Multi-Room Music 方案开源项目现已开源在 GitHub。

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项目价值

ESP Multi-Room Music 方案支持单个音箱的独立操作，在实现语音对话、音乐播放的同时，还能与其他预设群组音箱同步播放，并完成精确的实时校准同步，以实现立体环绕的音箱效果。这意味着，无论是个人消费类音响产品，还是专业商业音响产品，该方案都能为用户提供卓越的环绕体验和便利的使用体验。因其低时延同步播放的特性，该方案还能够被用于校园广播、居家检测报警、工厂流程化产品等应用中，为实时音频信息传递和设备实时共享提供关键支持。此外，ESP Multi-Room Music 方案还能与 ESP RainMaker 云平台实现互联，在满足用户使用 APP 对音响进行 DIY 群组控制的同时，还能作为语音中枢记录环境中的其他智能产品。

综上所述，ESP Multi-Room Music 方案为音频互联共享提供了崭新和高效的解决方案，这将为用户、学生、家庭和企业带来更丰富、更便捷、更智能的音频体验！

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开发指南

1. 环境配置

硬件要求：本例程支持的开发板在 $ADF_PATH/examples/README_CN.md 文档中例程与乐鑫音频开发板的兼容性表格中有标注，表格中标有绿色复选框的开发板均可运行本例程。如下面的配置一节所述，可以在 menuconfig 中选择开发板。

2. 编译和下载

使用 IDF 其他分支：本例程支持 IDF release/v4.2 及以后的分支，例程默认使用 IDF release/v4.4 分支。

cd $IDF_PATH

git checkout master

git pull

git checkout release/v4.2

git submodule update --init --recursive

配置：打开配置选项 idf.py menuconfig。

在 menuconfig > Audio HAL 中选择合适的开发板。

在 Example Configuration > WiFi SSID 和 WiFi Password 配置 Wi-Fi 网络。

编译和下载：请先编译版本并烧录到开发板上，然后运行 monitor 工具来查看串口输出 (替换 PORT 为端口名称):

idf.py -p PORT flash monitor

退出调试界面使用 Ctrl-]。

有关配置和使用 ESP-IDF 生成项目的完整步骤，请参阅《ESP-IDF 编程指南》。

3. 如何使用例程

功能和用法：

• 准备三块及以上乐鑫音频开发板（例如 ESP32-S3-Krovo-2 或者 ESP32-LyraT-Mini），同时在所有开发板上加载并运行示例。
• 当所有开发板都处于从机开始搜索模式后，按下其中一块开发板的 PLAY/REC 键开始 (ESP) Multi-Room Music 播放。

日志输出：

• 从机开始搜索，打印如下：

I (5451) ESP_AUDIO_TASK: media_ctrl_task running...,0x3f805a60



----------------------------- ESP Audio Platform -----------------------------

|                                                                            |

|                 ESP_AUDIO-v1.6.6-10-gf944a6b-aca0d7f-2d83f7a               |

|                     Compile date: Mar 15 2021-11:14:21                     |

------------------------------------------------------------------------------

I (5492) ESP_AUDIO_CTRL: Func:media_ctrl_create, Line:342, MEM Total:4338832 Bytes, Inter:220956 Bytes, Dram:205124 Bytes



I (5504) AUDIO_HAL: Codec mode is 3, Ctrl:1

I (5510) MRM_EXAMPLE: [ 3 ] Create and start input key service

I (5516) ESP_DECODER: esp_decoder_init, stack size is 30720

I (5522) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3

I (5545) I2S: APLL: Req RATE: 48000, real rate: 47999.961, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 12287990.000, SCLK: 1535998.750000, diva: 1, divb: 0

I (5549) ESP_AUDIO_CTRL: Enter play procedure, src:0

I (5554) ESP_AUDIO_CTRL: Play procedure, URL is ok, src:0

I (5560) ESP_AUDIO_CTRL: Request_CMD_Queue CMD:0, Available:5, que:0x3ffd5320

I (5568) ESP_AUDIO_TASK: It's a decoder

I (5572) ESP_AUDIO_TASK: 1.CUR IN:[IN_raw],CODEC:[DEC_auto],RESAMPLE:[48000],OUT:[OUT_iis],rate:0,ch:0,pos:0

I (5583) ESP_AUDIO_TASK: 2.Handles,IN:0x3f806fd0,CODEC:0x3f807254,FILTER:0x3f8075b8,OUT:0x3f807414

I (5592) ESP_AUDIO_TASK: 2.2 Update all pipeline

I (5597) ESP_AUDIO_TASK: 2.3 Linked new pipeline

I (5603) AUDIO_PIPELINE: link el->rb, el:0x3f806fd0, tag:IN_raw, rb:0x3f807758

I (5611) AUDIO_PIPELINE: link el->rb, el:0x3f807254, tag:DEC_auto, rb:0x3f809f98

I (5619) AUDIO_PIPELINE: link el->rb, el:0x3f8075b8, tag:Resample, rb:0x3f80bfd8

I (5627) ESP_AUDIO_TASK: 3. Previous starting...

I (5632) AUDIO_ELEMENT: [IN_raw-0x3f806fd0] Element task created

I (5639) AUDIO_THREAD: The DEC_auto task allocate stack on external memory

I (5648) AUDIO_ELEMENT: [DEC_auto-0x3f807254] Element task created

I (5653) AUDIO_ELEMENT: [DEC_auto] AEL_MSG_CMD_RESUME,state:1

I (5660) ESP_AUDIO_TASK: No Blocking play with decoder

I (5665) ESP_AUDIO_TASK: Recv Element[IN_raw-0x3f806fd0] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (5677) ESP_AUDIO_TASK: Recv Element[IN_raw-0x3f806fd0] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (5688) ESP_DECODER: Ready to do audio type check, pos:0, (line 104)

I (5695) ESP_AUDIO_CTRL: Func:_ctrl_play, Line:763, MEM Total:4267572 Bytes, Inter:206344 Bytes, Dram:190512 Bytes



I (5706) ESP_AUDIO_CTRL: Exit play procedure, ret:0

W (5714) MRM_MULTICAST: creat addr 239.255.255.252 port 1900

I (5718) AUDIO_THREAD: The mrm_slave_client task allocate stack on external memory

I (5726) MRM_CLIENT: Slave start searching...

• 主机开始播放，打印如下：

I (56177) MRM_EXAMPLE: [ * ] [Play] input key event

I (56734) MRM_CLIENT: slave client task stoped

I (56735) AUDIO_THREAD: The mrm_master_client task allocate stack on external memory

I (58324) HTTP_STREAM: total_bytes=2994349

I (58325) AUDIO_ELEMENT: [http-0x3f805e44] Element task created

I (58325) AUDIO_THREAD: The multi_room_play task allocate stack on external memory

I (58334) ESP_DECODER: Detect audio type is MP3

I (58338) MP3_DECODER: MP3 opened

I (58342) ADF_BIT_STREAM: The element is 0x3f807254. The reserve data 2 is 0x0.

I (58353) ESP_AUDIO_TASK: Recv Element[DEC_auto-0x3f807254] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (58367) ESP_AUDIO_TASK: Received music info then on play

I (58368) ESP_AUDIO_TASK: On event play, status:UNKNOWN, 0

I (58374) AUDIO_THREAD: The Resample task allocate stack on external memory

I (58382) AUDIO_ELEMENT: [Resample-0x3f8075b8] Element task created

I (58391) AUDIO_ELEMENT: [Resample] AEL_MSG_CMD_RESUME,state:1

I (58395) AUDIO_ELEMENT: [OUT_iis-0x3f807414] Element task created

I (58402) AUDIO_ELEMENT: [OUT_iis] AEL_MSG_CMD_RESUME,state:1

I (58408) I2S_STREAM: AUDIO_STREAM_WRITER

I (58413) ESP_AUDIO_TASK: Recv Element[OUT_iis-0x3f807414] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (58567) RSP_FILTER: sample rate of source data : 44100, channel of source data : 2, sample rate of destination data : 2

I (58571) ESP_AUDIO_TASK: Recv Element[Resample-0x3f8075b8] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (58583) ESP_AUDIO_TASK: ESP_AUDIO status is AEL_STATUS_STATE_RUNNING, 0, src:0, is_stopping:0

I (58592) ESP_AUDIO_TASK: Func:media_ctrl_task, Line:860, MEM Total:4169352 Bytes, Inter:155804 Bytes, Dram:139972 Bytes



I (59139) MRM_CLIENT: ===== Send Sync =====

Version:ESP32 MRM/1.0

Tag:SYNC_PTS

TSF:5784716

Sync:533



I (59543) MRM_CLIENT: ===== Send Sync =====

Version:ESP32 MRM/1.0

Tag:SYNC_PTS

TSF:5785121

Sync:938



I (59947) MRM_CLIENT: ===== Send Sync =====

Version:ESP32 MRM/1.0

Tag:SYNC_PTS

TSF:5785525

Sync:1344



I (60350) MRM_CLIENT: ===== Send Sync =====

Version:ESP32 MRM/1.0

Tag:SYNC_PTS

TSF:5785929

Sync:1749

• 从机开始播放，打印如下：

I (59095) MRM_EXAMPLE: slave set url https://dl.espressif.com/dl/audio/ff-16b-2c-44100hz.mp3

I (60563) HTTP_STREAM: total_bytes=2994349

I (60563) AUDIO_ELEMENT: [http-0x3f805e44] Element task created

W (60563) AUIDO_MEM: Can't support stack on external memory due to ESP32 chip is 1

I (60573) ESP_DECODER: Detect audio type is MP3

I (60577) MP3_DECODER: MP3 opened

I (60581) ADF_BIT_STREAM: The element is 0x3f806250. The reserve data 2 is 0x0.

I (60592) ESP_AUDIO_TASK: Recv Element[DEC_auto-0x3f806250] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (60607) ESP_AUDIO_TASK: Received music info then on play

I (60608) ESP_AUDIO_TASK: On event play, status:UNKNOWN, 0

W (60613) AUIDO_MEM: Can't support stack on external memory due to ESP32 chip is 1

I (60621) AUDIO_ELEMENT: [Resample-0x3f8065b4] Element task created

I (60629) AUDIO_ELEMENT: [Resample] AEL_MSG_CMD_RESUME,state:1

I (60634) AUDIO_ELEMENT: [OUT_iis-0x3f806410] Element task created

I (60641) AUDIO_ELEMENT: [OUT_iis] AEL_MSG_CMD_RESUME,state:1

I (60647) I2S_STREAM: AUDIO_STREAM_WRITER

I (60653) ESP_AUDIO_TASK: Recv Element[OUT_iis-0x3f806410] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (60800) RSP_FILTER: sample rate of source data : 44100, channel of source data : 2, sample rate of destination data : 2

I (60804) ESP_AUDIO_TASK: Recv Element[Resample-0x3f8065b4] MSG,type:20000,cmd:8,len:4,status:AEL_STATUS_STATE_RUNNING

I (60815) ESP_AUDIO_TASK: ESP_AUDIO status is AEL_STATUS_STATE_RUNNING, 0, src:0, is_stopping:0

I (60824) ESP_AUDIO_TASK: Func:media_ctrl_task, Line:860, MEM Total:4167400 Bytes, Inter:108288 Bytes, Dram:92456 Bytes



I (61554) MRM_EXAMPLE: slave got sync 601

I (61554) MRM_CLIENT: [sync] Sync 601 PTS 714 E2E_delay [68] sync diff [-13] ms

I (61964) MRM_EXAMPLE: slave got sync 1011

I (61965) MRM_CLIENT: [sync] Sync 1011 PTS 1024 E2E_delay [73] sync diff [-3] ms

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相关资源

• 项目 Github 链接
• 项目 README 文档_CN
• 例程与乐鑫音频开发板的兼容性表格
• 乐鑫物联网开发框架 ESP-IDF
• 乐鑫 ESP RainMaker SDK