OPUS is a audio format which is featuring high quality of audio or voice codec.
This program is using PWM for sound output. I don't have any I2S devices which is using in MaixPy.
22 -- L ch
23 -- R ch
you may use 2.2kΩ register and coupling capacitor to drive your head phone.
Demo music: PeriTune Sakuya3
You may use other music by using opus-demo for decoding and convert your outputfile using xxd command. (Not ogg container; sorry)
you can use libopus demo program
$ ./opus_demo -e voip 48000 2 64000 -framesize 20 test.raw test.opus && ./opus_demo -d 48000 2 test.opus test2.raw && aplay test2.raw -r 44100 -c2 -f S16_LEconvert into .c file
xxd -i [filename] > [outputfile]
libopus: https://github.com/xiph/opus (tested :ad8fe90db79b7d2a135e3dfd2ed6631b0c5662ab)
host is mips but this build is for any archtecture and overritten by CC=riscv64-unknown-elf-gcc
$ ./configure --host=mips --enable-fixed-point --disable-extra-programs CC=riscv64-unknown-elf-gcc CFLAGS=" -mcmodel=medany -fno-common -ffunction-sections -fdata-sections -fno-exceptions -fstrict-volatile-bitfields -fno-zero-initialized-in-bss -Os"
$ makeyou can see the archive in the .lib/ directory.