Play from remote host/url

[aidam38]

It'd absolutely awesome if this library also worked with remote host/url, like in https://github.com/schreibfaul1/ESP32-audioI2S. This would allow playing audio directly from youtube using the audio-only links generated by youtube-dl (the two audio codecs offered by youtube are opus and mp4a, I tried getting mp4a work with ESP32-audioI2S but ran into some issue, and I don't know if mp4a is compatible with m4a or aac anyway...).

I tried looking into implementing this myself, but it seems to be out of my abilities for now... Is there any chance you could take some time to implement this?

[schreibfaul1]

Hello aidam38, the problem is not the audio source. WiFi will work if you extend the example accordingly. The reason why I didn't include the opus decoder in audioI2S is the required size of the stack. audioI2S runs in the Arduino loop(). This is not sufficient for opus, too many recursions lead to a crash. The Arduino loop stack should be twice as big. How do you download audio streams from YouTuv'be. Do you have a premium account? And MP4 is not compatible with m4a.

[aidam38]

You don't need YouTube Premium or any sort of authentication to get audio streams from YouTube. Personally I'm using this library https://www.npmjs.com/package/ytdl-core and this short js snippet to get audio-only streams:

const info = await ytdl.getInfo("https://www.youtube.com/watch?v=VYJtb2YXae8")
const formats = ytdl.filterFormats(info.formats, "audioonly")

but I assume there's some sort of official YouTube API behind this which allows a client to request audio stream links for YouTube URLs (the urls returned from ytdl have an expiration and include the clients IP address in the query parameters; hence why I'm not including an example link here because it'd stop working in a day or so and I don't want to expose my IP).

The indicated mime types of the available streams are audio/mp4; codecs="mp4a.40.2" and audio/webm; codecs="opus".

[probonopd]

Thanks @schreibfaul1 for your libraries, which are extremely helpful. I am building a webradio/podcast player and really would like to have the capability to play OPUS podcasts from the web.

The reason why I didn't include the opus decoder in audioI2S is the required size of the stack. audioI2S runs in the Arduino loop(). This is not sufficient for opus, too many recursions lead to a crash. The Arduino loop stack should be twice as big.

Could we configure it to be twice as big? Would this help?

https://community.platformio.org/t/esp32-stack-configuration-reloaded/20994/4

[schreibfaul1]

In my audioI2S repository there is a test branch with this OPUS decoder but with a smaller stack, PSRAM is recommended. https://github.com/schreibfaul1/ESP32-audioI2S/tree/only_for_testing

[probonopd]

Thanks for the test branch with this OPUS decoder. Unfortunately I don't have a PSRAM device at hand. On my a ESP32-PICO-KIT V4 with i2s DAC, using 70a1311 has the side effect that I can no longer play this stream in my sketch, which did play before:

http://188.40.97.185:8179/stream

Is this caused by unrelated changes or does merely adding the OPUS codec impact the ability to play other formats?