Blargg's Audio Libraries - Blip_Buffer: http://slack.net/~ant/libs/audio.html#Blip_Buffer
Blip_Buffer provides waveform synthesis and sample buffering with a high-level interface that allows easy generation of square waves and similar with high sound quality. Waveforms are specified by amplitude changes at times in terms of the source clock rate, then efficiently resampled to the output sample rate with adjustable low-pass and high-pass filtering. It is well-suited for emulation of the sound chips used video game consoles before the mid-1990s.
Author : Shay Green hotpop.com@blargg
Website: http://www.slack.net/~ant/
Forum : http://groups.google.com/group/blargg-sound-libs
License: GNU Lesser General Public License (LGPL)
A series of tutorial programs and demos are included. To use a demo, compile and run a program consisting of the demo's .cpp file, the source files in player/ or sdl_player/ (as described below), and Blip_Buffer.cpp. The four numbered demos should be gone through first, since they show the basics.
It is recommended that you use the SDL multimedia library when building the demos, which enhances them with live display, output, and interactivity. It is available at http://www.libsdl.org/ and works on most platforms. If you have SDL, compile the demos with the source files from the sdl_player/ directory. If you don't have SDL or want the demos to write their output to a wave sound file, use the source files from the player/ directory
See notes.txt for more information, and Blip_Buffer.h and Blip_Synth.h for reference. Post to the discussion forum for assistance.
| Files | Notes |
|---|---|
| notes.txt | General notes about the library |
| changes.txt | Changes made since previous releases |
| LGPL.txt | GNU Lesser General Public License |
| Blip_Buffer.h | Blip_Buffer and Blip_Synth |
| Blip_Buffer.cpp | |
| demo/ | Tutorials and demos |
| waveform.cpp | How to generate a simple waveform |
| square.cpp | How to make a square wave |
| clock_rate.cpp | How the clock rate and sample rate work |
| continuous.cpp | How to generate a continuous square wave |
| multiple_waves.cpp | Multiple waves can be added into a buffer |
| stereo.cpp | How to generate stereo sound using two Blip_Buffers |
| treble_bass.cpp | How treble and bass affect waveform |
| buffering.cpp | Three ways of buffering samples in a Blip_Buffer |
| external_mixing.cpp | How to mix an external sample buffer into a Blip_Buffer |
| delta_synth.cpp | How to use low-level delta mode of Blip_Synth |
| sample_formats.cpp | Reading samples in floating-point and unsigned formats |
| sdl_audio.cpp | Complete example for programs using SDL sound |
| player/ | Use with demos to write output to wave sound file |
| player.h | Demo player and utilities |
| player.cpp | |
| Wave_Writer.h | Wave sound file writer |
| Wave_Writer.cpp | |
| sdl_player/ | Use with demos to play and show output interactively |
| player.cpp | Demo player using SDL |
| Audio_Scope.h | Audio scope window |
| Audio_Scope.cpp | |
| Sync_Audio.h | Simple synchronous audio interface for SDL sound |
| Sync_Audio.cpp |