Suggestion: support for the ESP32-A1S

[henkiejan1]

Hi Ed,

I didn't know if you knowing there is a special ESP32 for audio functions. It has a AC101 audio decoder inside. There are also very complete development boards like the AI Thinker audio development kit and it cost arround the €15,-. In my opinion a very good price for a real complete product.

I have ordered a AI Thinker audio developement kit with ESP32-A1S. It has a lot of function. But not standard a display. But you can easily add one. :)

See for more info this link.

[Edzelf]

Yes, looks good. I hope there is some documentation on how to use the AC101 for mp3 decoding.

[henkiejan1]

What i so read, is the development with the 'Espressif Audio Framework. ADF' There are samples on this Github: https://github.com/espressif/esp-adf There are also instructions for the Espressif audio development kits with a ES8388, ES8374 and ZL38063 codec chips. I read there nothing about the AC101 but on the Chinese wiki from AI Thinker translated they said you should use the ESP ADF also. Here is a link to a Google translated AI Thinker page from Chinese:

And this link from only the ESP32-A1S chip is also very interesting.

[Edzelf]

Reading the documentation I found out that the audiochip does not decode MP3. This is done in software, so high bitrates may cause a problem.

[arlaor]

Reading the documentation I found out that the audiochip does not decode MP3. This is done in software, so high bitrates may cause a problem.

Hi @Edzelf

then what would be the function of the AC101 chip?

[Edzelf]

Digital to analog conversion, volume control, filtering. I just received the esp32 audio development module. No success in putting it to work...

[henkiejan1]

Little bit sad that it could not be work. The board has all the hardware needs what i see integrated.

But what i also see is that Espressif also have there own equalboard but with other components. The Espressif LyraT board. Here is al link to the official Espressif site. One of the difference is that it used a external ES8388 codec chip. And that there is more documentation what i see than about the ESP32-A1S. Here is a lot information. i do not own this board but maybe also a idea?

[Edzelf]

As far as I know: the ES8388 is not an MP3 decoder.

[aguynamedben]

There's an abandoned PR from a year ago to get the AC101 working with esp-adf: https://github.com/espressif/esp-adf/pull/11

So sad 😭could have been the perfect audio dev board. Are y'all using LyraT? Does it "just work" with esp-adf?

[Edzelf]

I finally got my A1S board to work with the play_mp3 demo. I followed https://github.com/phkehl/esp32-a1s-audio_hal.

[arlaor]

Hi @Edzelf So is possible implement Esp32 Radio in a1s module?

[Edzelf]

Maybe, but I think that software MP3 decoding is too slow for the ESP32-Radio project. There is a sample program that reads a MP3 file from https://dl.espressif.com/dl/audio/ff-16b-2c-44100hz.mp3 (128 kbps) and plays it. That works correctly. Sound is good. Note that the codec used for Internet Radio is not always MP3, but sometimes AAC. I would say: give it a try!

[Edzelf]

You have to replace "AUDIO_HAL_ES8388_DEFAULT" by "AUDIO_HAL_AC101_DEFAULT".

[henkiejan1]

Very interesting! :) My experience with the ESP32-A1S with mp3 on a SD card and the default demo software is that the sound quality was really good! You could download also a sample firmware from the AI Thinker site. https://wiki.ai-thinker.com/esp32-a1s on the bottem of the site. Tip: use google chrome because the whole site is in Chinese.

[henkiejan1]

I has a little bit time so i started to experimented with my AI Thinker board. I have now for a long time the AAC stream of Q-music Netherlands playing (not https!!) without interrupts with the example ai_examples/pipeline_living_stream . Off course with the default example so i cant tune up the volume. But sound quality is very good. I have configured in make menuconfig for now the CPU on 240MHz. I used the modified ESP-ADF from https://github.com/donny681/esp-adf

it used now arround 135mAh from a powerbank standalone.

I like to try more :)

[henkiejan1]

And BTW id didn;t know if you saw it. But there is a datasheet in your link for the AC101 decoder. https://github.com/phkehl/esp32-a1s-audio_hal/blob/master/doc/x-powers-AC101-codec-datasheet.pdf

[henkiejan1]

And it even run on 80MHz without problems.

rst:0x1 (POWERON_RESET),boot:0x1f (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff0018,len:4 load:0x3fff001c,len:5540 load:0x40078000,len:0 load:0x40078000,len:13752 entry 0x40078fb0 I (28) boot: ESP-IDF v3.0.1 2nd stage bootloader I (28) boot: compile time 23:00:04 I (28) boot: Enabling RNG early entropy source... I (33) boot: SPI Speed : 80MHz I (37) boot: SPI Mode : DIO I (41) boot: SPI Flash Size : 4MB I (45) boot: Partition Table: I (48) boot: ## Label Usage Type ST Offset Length I (56) boot: 0 nvs WiFi data 01 02 00009000 00006000 I (63) boot: 1 phy_init RF data 01 01 0000f000 00001000 I (71) boot: 2 factory factory app 00 00 00010000 00100000 I (78) boot: End of partition table I (82) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x1de9c (122524) map I (127) esp_image: segment 1: paddr=0x0002dec4 vaddr=0x3ffb0000 size=0x0214c ( 8524) load I (130) esp_image: segment 2: paddr=0x00030018 vaddr=0x400d0018 size=0x88b88 (560008) map I (296) esp_image: segment 3: paddr=0x000b8ba8 vaddr=0x3ffb214c size=0x01104 ( 4356) load I (298) esp_image: segment 4: paddr=0x000b9cb4 vaddr=0x40080000 size=0x00400 ( 1024) load I (303) esp_image: segment 5: paddr=0x000ba0bc vaddr=0x40080400 size=0x0beac ( 48812) load I (329) esp_image: segment 6: paddr=0x000c5f70 vaddr=0x400c0000 size=0x00000 ( 0) load I (337) boot: Loaded app from partition at offset 0x10000 I (337) boot: Disabling RNG early entropy source... I (339) cpu_start: Pro cpu up. I (342) cpu_start: Starting app cpu, entry point is 0x40081228 I (0) cpu_start: App cpu up. I (353) heap_init: Initializing. RAM available for dynamic allocation: I (360) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM I (366) heap_init: At 3FFB91A0 len 00026E60 (155 KiB): DRAM I (372) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM I (378) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM I (385) heap_init: At 4008C2AC len 00013D54 (79 KiB): IRAM I (391) cpu_start: Pro cpu start user code I (184) cpu_start: Starting scheduler on PRO CPU. I (0) cpu_start: Starting scheduler on APP CPU. I (286) HTTP_MP3_EXAMPLE: [ 1 ] Start audio codec chip I (1406) HTTP_MP3_EXAMPLE: [2.0] Create audio pipeline for playback I (1406) HTTP_MP3_EXAMPLE: [2.1] Create http stream to read data I (1406) HTTP_MP3_EXAMPLE: [2.2] Create i2s stream to write data to codec chip I (1416) HTTP_MP3_EXAMPLE: [2.3] Create mp3 decoder to decode mp3 file I (1416) HTTP_MP3_EXAMPLE: [2.4] Register all elements to audio pipeline I (1426) HTTP_MP3_EXAMPLE: [2.5] Link it together http_stream-->mp3_decoder-->i2s_stream-->[codec_chip] I (1436) HTTP_MP3_EXAMPLE: [2.6] Setup uri (http as http_stream, mp3 as mp3 decoder, and default output is i2s) I (1446) HTTP_MP3_EXAMPLE: [ 3 ] Start and wait for Wi-Fi network I (1496) phy: phy_version: 3662, 711a97c, May 9 2018, 14:29:06, 0, 0 W (3756) PERIPH_WIFI: Wi-Fi disconnected from SSID MijnWifi, auto-reconnect enabled, reconnect after 1000 ms I (5726) HTTP_MP3_EXAMPLE: [ 4 ] Setup event listener I (5726) HTTP_MP3_EXAMPLE: [4.1] Listening event from all elements of pipeline I (5726) HTTP_MP3_EXAMPLE: [4.2] Listening event from peripherals I (5736) HTTP_MP3_EXAMPLE: [ 5 ] Start audio_pipeline I (6286) HTTP_MP3_EXAMPLE: [ * ] Receive music info from mp3 decoder, sample_rates=44100, bits=16, ch=2

[Technikfreak2002]

@henkiejan1 How did you compile this? I have set up everything yesterday on a Linux Mint VM and could not compile any example of the modified adf without errors....

Is there any progress anyway?

Thank You!

[henkiejan1]

Just with the ESP-ADF framework and the examples. Not with ESP32-Radio. You just need to read every step carefully.