PortAudio portable cross-platform audio I/O library (fork)
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d859f7d5dfThe currently used clock, CLOCK_REALTIME, will have discontinuous jumps, forward and backward, when the system clock is adjusted. This is bad for synchronizing audio. CLOCK_MONOTONIC does not have jumps, and never moves backward, but does have the continuous adjustments done by NTP to increase clock accuracy. Since kernel 2.6.25 ALSA has use CLOCK_MONOTONIC by default for timestamps (commit b751eef1 from Dec 13 2007). This change means the timestamps provided in the PA callbacks can be compared to PaUtil_GetTime(), which currently does not work. The function used on MacOS, mach_absolute_time(), behaves like CLOCK_MONOTONIC. If the system does not have CLOCK_MONOTONIC, fallback to CLOCK_REALTIME, which is what alsa-lib does for such systems. Which at this point would need to be very old. * Use clock monotonic for condition variable This is necessary to match PaUtil_GetTime() also using the monotonic clock. Otherwise the wait time, derived from that function, will be completely incorrect. This will also fix an obscure flaw if the system clock is adjust while waiting for the stream to open, it might not wait at all and fail or wait (effectively) forever instead of timing out, depend on the adjustment direction. |
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PortAudio - portable audio I/O library
PortAudio is a portable audio I/O library designed for cross-platform support of audio. It uses either a callback mechanism to request audio processing, or blocking read/write calls to buffer data between the native audio subsystem and the client. Audio can be processed in various formats, including 32 bit floating point, and will be converted to the native format internally.
Documentation:
- Documentation is available at http://www.portaudio.com/docs/
- Or at
/doc/html/index.htmlafter running Doxygen. - Also see
src/common/portaudio.hfor the API spec. - And see the
examples/andtest/directories for many examples of usage. (We suggestexamples/paex_saw.cfor an example.)
For information on compiling programs with PortAudio, please see the tutorial at:
http://portaudio.com/docs/v19-doxydocs/tutorial_start.html
We have an active mailing list for user and developer discussions. Please feel free to join. See http://www.portaudio.com for details.
Important Files and Folders:
include/portaudio.h = header file for PortAudio API. Specifies API.
src/common/ = platform independent code, host independent
code for all implementations.
src/os = os specific (but host api neutral) code
src/hostapi = implementations for different host apis
Host API Implementations:
src/hostapi/alsa = Advanced Linux Sound Architecture (ALSA)
src/hostapi/asihpi = AudioScience HPI
src/hostapi/asio = ASIO for Windows and Macintosh
src/hostapi/coreaudio = Macintosh Core Audio for OS X
src/hostapi/dsound = Windows Direct Sound
src/hostapi/jack = JACK Audio Connection Kit
src/hostapi/oss = Unix Open Sound System (OSS)
src/hostapi/wasapi = Windows Vista WASAPI
src/hostapi/wdmks = Windows WDM Kernel Streaming
src/hostapi/wmme = Windows MultiMedia Extensions (MME)
Test Programs:
test/pa_fuzz.c = guitar fuzz box
test/pa_devs.c = print a list of available devices
test/pa_minlat.c = determine minimum latency for your machine
test/paqa_devs.c = self test that opens all devices
test/paqa_errs.c = test error detection and reporting
test/patest_clip.c = hear a sine wave clipped and unclipped
test/patest_dither.c = hear effects of dithering (extremely subtle)
test/patest_pink.c = fun with pink noise
test/patest_record.c = record and playback some audio
test/patest_maxsines.c = how many sine waves can we play? Tests Pa_GetCPULoad().
test/patest_sine.c = output a sine wave in a simple PA app
test/patest_sync.c = test synchronization of audio and video
test/patest_wire.c = pass input to output, wire simulator