The AudioKit and some ESP32 Processors have 4MB of SPI RAM that we can use e.g. to store recorded audio. I was playing with the idea to build some looping logic. Therefore I have added an additional DynamicMemoryStream class that can stores the audio data on the heap. With the Read more
I added support for the VS1053 breakout boards to my Arduino Audio Tools project. Finally the recording of sound from the microphone or the aux input is working as well both for the VS1003 and VS1053 devices! Arduino Sketch It is working the same like any other input: #include “AudioTools.h” Read more
The VS1053 and VS1003 audio codecs support real time MIDI. While the VS1003 only provides a few instruments, the VS1053 has 128 melodic instruments and quite a few additional percussion instruments! When GPIO0 is low and GPIO1 is high during boot, real-time MIDI mode is activated. Unfortunately these pins are Read more
I added support for the VS1053 breakout boards to my Arduino Audio Tools project. This module is interesting if you have a microcontroller that does not support I2S because all communication is going via SPI. Some boards also include an SD drive. The major disadvantage is the number of pins Read more
I converted some Audio C++ libraries into Arduino Libraries and used symlinks which point to the original file locations to make sure that Arduino can find all relevant files. This approach was working fine in OSX and Linux. Unfortunately this seems to create problems in Windows, so I decided to Read more
The ESP32 microcontroller has only a few hundred kilobytes of internal RAM. Fortunately the ESP32 AudioKit or ESP32 Wrover provide 8MB PSRAM where 4MB can be directly addressed. More information how to use PSRAM in Arduino can be found here. The only thing to highlight is that PSRAM can not Read more
Per definition ogg files should use the Vorbis file format using Ogg framing. Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality: So it is basically the open source alternative to mp3! xiph.org provides an integer only decoder implementation which is based Read more
I started to work on a FLAC CODEC for my Arduino Audio Tools. FLAC stands for Free Lossless Audio Codec, an audio format similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality. This is similar to how Zip works, except with FLAC Read more
When I was looking for an alternative open source MP3 decoder, I found the minimp3 project from lieff. Arduino Support Yesterday I took another effort to make it work on an Arduino ESP32. To make the project Arduino compatible was easy: I just had to add library.properties and change the Read more
Codecs play an important role in audio streaming, as we have seen in one of my last blogs. I have spent some time to make the Opus Codec available as Arduino Library and I am providing some simple integration from my Arduino Audio Tools library. Opus is a codec for Read more