OpenDSP replaces the Nintendo 3DS DSP firmware used by libctru's ndsp.
Link it into your homebrew so users don't need to dump dspfirm.cdc.
It was written from scratch and contains no Nintendo firmware code.
With devkitPro and libctru installed:
make -C library installAdd OpenDSP to your Makefile:
LIBS := -lopendsp -lctru -lm
LIBDIRS := $(PORTLIBS) $(CTRULIB)Include <opendsp.h>, use opendspInit() instead of ndspInit(), and call
opendspExit() when you're done. Your other ndsp calls stay the same.
The guide covers adding it directly to a project.
OpenDSP supports 24 voices, PCM8/PCM16, DSP-ADPCM, mono/stereo, looping buffers, all three interpolation modes, filters, mixing, capture and sleep/wake. Surround output is currently mixed down to stereo; the rear ratio still works.
Reverb and delay run on the DSP through ndsp's two aux buses. Include
<opendsp/effects.h> to configure them. The guide
has an example, and Sound Lab includes Room, Hall, Plate and Cave presets.
Use <opendsp/audio.h> to stream WAV, AAC and MP3 with pause, looping and WAV seeking.
It reads and buffers files in the background. See the streaming guide
and example.
AAC-LC uses the DSP by default. ARM11 is available for standalone decoding and
formats outside the DSP's limits. If you only need the decoder, use
<opendsp/aac.h>; AAC.md covers its API and format limits.
MP3 runs on DSP by default, with ARM11 available explicitly. Both support
MPEG-1 Layer III up to 320 kbit/s. Use <opendsp/mp3.h> for raw-frame decoding;
MP3.md covers formats and API use.
Sound Lab lets you try music, sound effects, WAV/AAC/MP3 files,
filters and effects. The live monitor shows DSP load and the active decoder. Put your music in
sdmc:/3ds/opendsp-lab/ and press X in the player to switch decoders.
CIA and 3DSX downloads are included. You can also build it with
make -C examples/soundlab or make -C examples/soundlab cia.
Tested on a New Nintendo 3DS with Luma3DS. The library includes the firmware; see BUILDING.md if you want to change it.
BSD 2-Clause. Include the copyright notice and license text when distributing OpenDSP.
Made by Cellenseres. Thanks to Gericom for teak-llvm, wwylele for teakra, and the devkitPro and libctru developers.
OpenDSP is not affiliated with Nintendo.