In traditional http streaming we can just read a single audio stream and feed it to a decoder. Unfortunatly Http Live Streaming (HLS) adds a lot of additional complexity and overhead. It works by splitting an audiostream into very short segments, which are just a few seconds in length, and Read more
After we can access the Internet purely using IDF functionality w/o Arduino, the final challange is to provide access to files as Streams! IDF provides the concept of the Virtual File System (VFS): you can mount a file system under a name and access the files of that file system Read more
In my last post, I described that I have implemented the URLStream class using pure IDF functionality. So you will not be wrong if you expect a working MP3 Internat Player next that just relies on the IDF w/o Arduino. The main.cpp Program Here is the complete IDF program that Read more
The following classes can be used as HTTP client and implement the AbstractURLStream API. All these classes are dependent on the Arduino Networking API: URLStream: Supports HTTP GET, POST, PUT and DELETE ICYStream: Supports the ICY protocol URLStreamBuffered: Using buffer that is filled by a task ICYStreamBuffered: Using buffer that Read more
In all my demo sketches so far, I have used just one decoder only, but what if we want to play multiple audio file types ? To support this scenario, I decided to provide the MultiDecoder class, that lets you register your codecs with the corresponding mime type. This class Read more
So far I was using the Fast Fourier Transform (FFT) functionality of my “Arduino Audio Tools Library” for analyzing the audio. This week I spent some time to make sure that we also support the inverse FFT properly. The inverse FFT is generating audio samples in the time domain from Read more
When I was comparing the RP2040 with an ESP32 for audio filters quite some time ago , the ESP32 was winning by a big margin. The Rasperry Pico has been improved with the new RP2350 and I thought it would be interesting to have a comparision: I was using the Read more
Yesterday, a user was proposing an Arduino Sketch for a Guitar Effects Pedal which is mixing the original input with an effect. Setting up a simple effect is easy, but I have never thought about how to mix the effect with the original input. He was proposing the following process Read more
I was wondering if the Raperry Pico 2W can be used with my Arduino Snapclient Library. A related discussion was hinting that it is just not powerful enough. In the beginning was stuggeling quite a bit and the audio with Opus was just not working and I could bareliy make Read more
The starting point for writing audio data from USB to I2S using a Rasperry Pico (RP2040) Microcontroller is the speaker example sketch from my extended TinyUSB library. We would just do an i2s.write(data, len) in the callback: Unfortunately this did not work and this was locking up the output quite Read more