ESP8266 Community Forum

hdrut wrote:Cooooool, listening to DI.fm already

Got to get some flash and DAC ics soon !!

Thks again Jeroen.

MVG

Horacio

Hello
Could you tell me how you compiled the source files.
Thank you very much

First thanks for the great work!
I added a DAC and the sound is great. Still, without the SPI memory I do have some lag that is getting worst an worst after 5minutes.

I have a naive question : on an ESP8266 with 4Mo of flash, could this flash be used to allow more RAM to buffer the MP3 stream and avoid the use of a separate SPI RAM chip? or is there another benefit of using a 2nd SPI chip?

Thanks for you help

I would like to drive a H-Bridge gate driver of a class D amplifier with a PWM/PDM signal/channel with ESP8266. Due to the 160 Mhz the ESP8266 can be a decent modulator for a D Class amp.

But, I don't see how this chip can handle a 320 kbps data rate, the best receive speeds I found on the internet are 20 kb/s IN THE BEST CASE with UDP and that's still only 160 kbps. Most of the times however the receive speed will be about 10 kb/s or even lower. If we optimize the TCP stack we could get a constant 15-20 kb/s for 160 kbps streaming and that's more than enough for most people, but still suboptimal compared to only a little more expensive chips.

Also I don't think that MP3 streaming or decoding with MAD is any good, the Opus codec would be a MUCH MUCH better option than MAD because opus supports variable bitrates and multiple channels while MAD supports only 1 channel. An MP3 to Opus service is a simple nodejs/python server with ffmpeg and libopus.

If one could implement an opus codec decoder for ESP8266 this little thing would become way more awesome even with 128-160 kbps. Those who need higher bitrates are pretty much f.-ed by the low Rx speed unless buffering is acceptable so there is no reason to buy an expensive DAC module to use with this chip.
https://www.opus-codec.org

Congratulation, Sprite_tm for this super works!
Hard work for some days and now I can hear the music! The next step is to connect a PCM5102 board (I made it to RPi) to the I2S output. Only one thing what I don't understand. When I uploaded the eagle.flash.bin and theeagle.irom0text.bin files to ESP8266, it didn't work, I had to upload blank.bin files, as rudi wrote last year in nr.19829. Would somebody explain why is this?