mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-08 18:16:02 -05:00
5b9645bf09
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
223 lines
7.8 KiB
Plaintext
223 lines
7.8 KiB
Plaintext
STATUS:
|
|
|
|
MME, DirectSound and ASIO versions are more-or-less working. See FIXMEs @todos
|
|
and the proposals matrix at portaudio.com for further status.
|
|
|
|
The pa_tests directory contains tests. pa_tests/README.txt notes which tests
|
|
currently build.
|
|
|
|
The PaUtil support code is finished enough for other implementations to be
|
|
ported. No changes are expected to be made to the definition of the PaUtil
|
|
functions.
|
|
|
|
Note that it's not yet 100% clear how the current support functions
|
|
will interact with blocking read/write streams.
|
|
|
|
BUILD INSTRUCTIONS
|
|
|
|
to build tests/patest_sine.c you will need to compile and link the following
|
|
files (MME)
|
|
pa_common\pa_process.c
|
|
pa_common\pa_skeleton.c
|
|
pa_common\pa_stream.c
|
|
pa_common\pa_trace.c
|
|
pa_common\pa_converters.c
|
|
pa_common\pa_cpuload.c
|
|
pa_common\pa_dither.c
|
|
pa_common\pa_front.c
|
|
pa_common\pa_allocation.h
|
|
pa_win\pa_win_util.c
|
|
pa_win\pa_win_hostapis.c
|
|
pa_win_wmme\pa_win_wmme.c
|
|
|
|
see below for a description of these files.
|
|
|
|
|
|
FILES:
|
|
|
|
portaudio.h
|
|
public api header file
|
|
|
|
pa_front.c
|
|
implements the interface defined in portaudio.h. manages multiple host apis.
|
|
validates function parameters before calling through to host apis. tracks
|
|
open streams and closes them at Pa_Terminate().
|
|
|
|
pa_util.h
|
|
declares utility functions for use my implementations. including utility
|
|
functions which must be implemented separately for each platform.
|
|
|
|
pa_hostapi.h
|
|
hostapi representation structure used to interface between pa_front.c
|
|
and implementations
|
|
|
|
pa_stream.c/h
|
|
stream interface and representation structures and helper functions
|
|
used to interface between pa_front.c and implementations
|
|
|
|
pa_cpuload.c/h
|
|
source and header for cpu load calculation facility
|
|
|
|
pa_trace.c/h
|
|
source and header for debug trace log facility
|
|
|
|
pa_converters.c/h
|
|
sample buffer conversion facility
|
|
|
|
pa_dither.c/h
|
|
dither noise generator
|
|
|
|
pa_process.c/h
|
|
callback buffer processing facility including interleave and block adaption
|
|
|
|
pa_allocation.c/h
|
|
allocation context for tracking groups of allocations
|
|
|
|
pa_skeleton.c
|
|
an skeleton implementation showing how the common code can be used.
|
|
|
|
pa_win_util.c
|
|
Win32 implementation of platform specific PaUtil functions (memory allocation,
|
|
usec clock, Pa_Sleep().) The file will be used with all Win32 host APIs.
|
|
|
|
pa_win_hostapis.c
|
|
contains the paHostApiInitializers array and an implementation of
|
|
Pa_GetDefaultHostApi() for win32 builds.
|
|
|
|
pa_win_wmme.c
|
|
Win32 host api implementation for the windows multimedia extensions audio API.
|
|
|
|
pa_win_wmme.h
|
|
public header file containing interfaces to mme-specific functions and the
|
|
deviceInfo data structure.
|
|
|
|
|
|
CODING GUIDELINES:
|
|
|
|
naming conventions:
|
|
#defines begin with PA_
|
|
#defines local to a file end with _
|
|
global utility variables begin with paUtil
|
|
global utility types begin with PaUtil (including function types)
|
|
global utility functions begin with PaUtil_
|
|
static variables end with _
|
|
static constants begin with const and end with _
|
|
static funtions have no special prefix/suffix
|
|
|
|
In general, implementations should declare all of their members static,
|
|
except for their initializer which should be exported. All exported names
|
|
should be preceeded by Pa<MN>_ where MN is the module name, for example
|
|
the windows mme initializer should be named PaWinWmme_Initialize().
|
|
|
|
Every host api should define an initializer which returns an error code
|
|
and a PaHostApiInterface*. The initializer should only return an error other
|
|
than paNoError if it encounters an unexpected and fatal error (memory allocation
|
|
error for example). In general, there may be conditions under which it returns
|
|
a NULL interface pointer and also returns paNoError. For example, if the ASIO
|
|
implementation detects that ASIO is not installed, it should return a
|
|
NULL interface, and paNoError.
|
|
|
|
Platform-specific shared functions should begin with Pa<PN>_ where PN is the
|
|
platform name. eg. PaWin_ for windows, PaUnix_ for unix.
|
|
|
|
The above two conventions should also be followed whenever it is necessary to
|
|
share functions accross multiple source files.
|
|
|
|
Two utilities for debug messages are provided. The PA_DEBUG macro defined in
|
|
pa_implementation.h provides a simple way to print debug messages to stderr.
|
|
Due to real-time performance issues, PA_DEBUG may not be suitable for use
|
|
within the portaudio processing callback, or in other threads. In such cases
|
|
the event tracing facility provided in pa_trace.h may be more appropriate.
|
|
|
|
If PA_LOG_API_CALLS is defined, all calls to the public PortAudio API
|
|
will be logged to stderr along with parameter and return values.
|
|
|
|
|
|
TODO:
|
|
(this list is totally out of date)
|
|
|
|
finish coding converter functions in pa_converters.c (anyone?)
|
|
|
|
implement block adaption in pa_process.c (phil?)
|
|
|
|
fix all current tests to work with new code. this should mostly involve
|
|
changing PortAudioStream to PaStream, and GetDefaultDeviceID to GetDefaultDevice etc.
|
|
|
|
write some new tests to exercise the multi-api functions
|
|
|
|
write (doxygen) documentation for pa_trace (phil?)
|
|
|
|
remove unused typeids from PaHostAPITypeID
|
|
|
|
create a global configuration file which documents which PA_ defines can be
|
|
used for configuration
|
|
|
|
need a coding standard for comment formatting
|
|
|
|
migrate directx (phil)
|
|
|
|
migrate asio (ross?, stephane?)
|
|
|
|
see top of pa_win_wmme.c for MME todo items (ross)
|
|
|
|
write style guide document (ross)
|
|
|
|
|
|
DESIGN ISSUES:
|
|
(this list is totally out of date)
|
|
|
|
consider removing Pa_ConvertHostApiDeviceIndexToGlobalDeviceIndex() from the API
|
|
|
|
switch to new latency parameter mechanism now (?)
|
|
|
|
question: if input or outputDriverInfo structures are passed for a different
|
|
hostApi from the one being called, do we return an error or just ignore
|
|
them? (i think return error)
|
|
|
|
consider renaming PortAudioCallback to PaStreamCallback
|
|
|
|
consider renaming PaError, PaResult
|
|
|
|
|
|
ASSORTED DISORGANISED NOTES:
|
|
|
|
NOTE:
|
|
pa_lib.c performs the following validations for Pa_OpenStream() which we do not currently do:
|
|
- checks the device info to make sure that the device supports the requested sample rate,
|
|
it may also change the sample rate to the "closest available" sample rate if it
|
|
is within a particular error margin
|
|
|
|
rationale for breaking up internalPortAudioStream:
|
|
each implementation has its own requirements and behavior, and should be
|
|
able to choose the best way to operate without being limited by the
|
|
constraints imposed by a common infrastructure. in other words the
|
|
implementations should be able to pick and choose services from the
|
|
common infrastructure. currently identified services include:
|
|
|
|
- cpu load tracking
|
|
- buffering and conversion service (same code works for input and output)
|
|
- should support buffer multiplexing (non-integer length input and output buffers)
|
|
- in-place conversion where possible (only for callback, read/write always copies)
|
|
- should manage allocation of temporary buffers if necessary
|
|
- instrumentation (should be able to be disabled): callback count, framesProcessed
|
|
- common data: magic, streamInterface, callback, userdata
|
|
|
|
|
|
- conversion functions:
|
|
- should handle temp buffer allocation
|
|
- dithering (random number state per-stream)
|
|
- buffer size mismatches
|
|
- with new buffer slip rules, temp buffers may always be needed
|
|
- we should aim for in-place conversion wherever possible
|
|
- does phil's code support in-place conversion? (yes)
|
|
|
|
- dicuss relationship between user and host buffer sizes
|
|
- completely independent.. individual implementations may constrain
|
|
host buffer sizes if necessary
|
|
|
|
|
|
- discuss device capabilities:
|
|
- i'd like to be able to request certain information:
|
|
- channel count for example
|
|
|