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Multi-Room Music example

Example Brief

ESP Multi-Room Music is a Wi-Fi-based communication protocol to share music among multiple interconnected speakers. Under this protocol, those connected speakers form a Group. They can play music synchronously and are controlled together, which can easily achieve a theater-grade stereo surround sound system.

Resources

Memory consumption:

memory_total (byte) memory_inram (byte) memory_psram (byte)
279632 145064 134568

Environment Setup

Hardware Required

This example runs on the boards that are marked with a green checkbox in the table. Please remember to select the board in menuconfig as discussed in Section Configuration below.

Example Set Up

Use Special IDF Branch

  • This example needs to select a branch above IDF relase/v5.0 to compile:
cd $IDF_PATH
git checkout master
git pull
git checkout release/v5.0
git submodule update --init --recursive

Configuration

Open the project configuration menu (idf.py menuconfig).

  • Select a compatible audio board in menuconfig > Audio HAL
  • Set up Wi-Fi connection in Example Configuration > WiFi SSID and WiFi Password

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output (replace PORT with your board's serial port name):

idf.py -p PORT flash monitor

To exit the serial monitor, type Ctrl-].

See ESP-IDF Programming Guide for full steps to configure and build an ESP-IDF project.

How to Use the Example

Example Functionality

  • Prepare some audio boards, load and run the example on all of them.
  • After all the boards are in Slave start searching mode, press the PLAY/REC button on one of the boards to start Multi-Room Music playback.

Example Log

  • Slave start searching
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...
  • Master playing
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
  • Slave playing
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

Technical Support and Feedback

Please use the following feedback channels:

  • For technical queries, go to the esp32.com forum
  • For a feature request or bug report, create a GitHub issue

We will get back to you as soon as possible.