mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-23 12:48:40 -05:00
8d353a5b3b
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
426 lines
14 KiB
Plaintext
426 lines
14 KiB
Plaintext
#ifndef PORT_AUDIO_H
|
|
#define PORT_AUDIO_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
/*
|
|
* PortAudio Portable Real-Time Audio Library
|
|
* PortAudio API Header File
|
|
* Latest version available at: http://www.audiomulch.com/portaudio/
|
|
*
|
|
* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files
|
|
* (the "Software"), to deal in the Software without restriction,
|
|
* including without limitation the rights to use, copy, modify, merge,
|
|
* publish, distribute, sublicense, and/or sell copies of the Software,
|
|
* and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* Any person wishing to distribute modifications to the Software is
|
|
* requested to send the modifications to the original developer so that
|
|
* they can be incorporated into the canonical version.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
|
|
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
|
|
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
typedef int PaError;
|
|
typedef enum {
|
|
paNoError = 0,
|
|
|
|
paHostError = -10000,
|
|
paInvalidChannelCount,
|
|
paInvalidSampleRate,
|
|
paInvalidDeviceId,
|
|
paInvalidFlag,
|
|
paSampleFormatNotSupported,
|
|
paBadIODeviceCombination,
|
|
paInsufficientMemory,
|
|
paBufferTooBig,
|
|
paBufferTooSmall,
|
|
paNullCallback,
|
|
paBadStreamPtr,
|
|
paTimedOut,
|
|
paInternalError
|
|
} PaErrorNum;
|
|
|
|
/*
|
|
Pa_Initialize() is the library initialisation function - call this before
|
|
using the library.
|
|
*/
|
|
|
|
PaError Pa_Initialize( void );
|
|
|
|
/*
|
|
Pa_Terminate() is the library termination function - call this after
|
|
using the library.
|
|
*/
|
|
|
|
PaError Pa_Terminate( void );
|
|
|
|
/*
|
|
Return host specific error.
|
|
This can be called after receiving a paHostError.
|
|
*/
|
|
long Pa_GetHostError( void );
|
|
|
|
/*
|
|
Translate the error number into a human readable message.
|
|
*/
|
|
const char *Pa_GetErrorText( PaError errnum );
|
|
|
|
/*
|
|
Sample formats
|
|
|
|
These are formats used to pass sound data between the callback and the
|
|
stream. Each device has a "native" format which may be used when optimum
|
|
efficiency or control over conversion is required.
|
|
|
|
Formats marked "always available" are supported (emulated) by all devices.
|
|
|
|
The floating point representation uses +1.0 and -1.0 as the respective
|
|
maximum and minimum.
|
|
|
|
*/
|
|
|
|
typedef unsigned long PaSampleFormat;
|
|
#define paFloat32 ((PaSampleFormat) (1<<0)) /*always available*/
|
|
#define paInt16 ((PaSampleFormat) (1<<1)) /*always available*/
|
|
#define paInt32 ((PaSampleFormat) (1<<2)) /*always available*/
|
|
#define paInt24 ((PaSampleFormat) (1<<3))
|
|
#define paPackedInt24 ((PaSampleFormat) (1<<4))
|
|
#define paInt8 ((PaSampleFormat) (1<<5))
|
|
#define paUInt8 ((PaSampleFormat) (1<<6)) /* unsigned 8 bit, 128 is "ground" */
|
|
#define paCustomFormat ((PaSampleFormat) (1<<16))
|
|
|
|
/*
|
|
Device enumeration mechanism.
|
|
|
|
Device ids range from 0 to Pa_CountDevices()-1.
|
|
|
|
Devices may support input, output or both. Device 0 is always the "default"
|
|
device and should support at least stereo in and out if that is available
|
|
on the taget platform _even_ if this involves kludging an input/output
|
|
device on platforms that usually separate input from output. Other platform
|
|
specific devices are specified by positive device ids.
|
|
*/
|
|
|
|
typedef int PaDeviceID;
|
|
#define paNoDevice -1
|
|
|
|
typedef struct{
|
|
int structVersion;
|
|
const char *name;
|
|
int maxInputChannels;
|
|
int maxOutputChannels;
|
|
/* Number of discrete rates, or -1 if range supported. */
|
|
int numSampleRates;
|
|
/* Array of supported sample rates, or {min,max} if range supported. */
|
|
const double *sampleRates;
|
|
PaSampleFormat nativeSampleFormats;
|
|
} PaDeviceInfo;
|
|
|
|
|
|
int Pa_CountDevices();
|
|
/*
|
|
Pa_GetDefaultInputDeviceID(), Pa_GetDefaultOutputDeviceID()
|
|
|
|
Return the default device ID or paNoDevice if there is no devices.
|
|
The result can be passed to Pa_OpenStream().
|
|
|
|
On the PC, the user can specify a default device by
|
|
setting an environment variable. For example, to use device #1.
|
|
|
|
set PA_RECOMMENDED_OUTPUT_DEVICE=1
|
|
|
|
The user should first determine the available device ID by using
|
|
the supplied application "pa_devs".
|
|
*/
|
|
PaDeviceID Pa_GetDefaultInputDeviceID( void );
|
|
PaDeviceID Pa_GetDefaultOutputDeviceID( void );
|
|
|
|
/*
|
|
PaTimestamp is used to represent a continuous sample clock with arbitrary
|
|
start time useful for syncronisation. The type is used in the outTime
|
|
argument to the callback function and the result of Pa_StreamTime()
|
|
*/
|
|
|
|
typedef double PaTimestamp;
|
|
|
|
/*
|
|
Pa_GetDeviceInfo() returns a pointer to an immutable PaDeviceInfo structure
|
|
referring to the device specified by id.
|
|
If id is out of range the function returns NULL.
|
|
|
|
The returned structure is owned by the PortAudio implementation and must
|
|
not be manipulated or freed. The pointer is guaranteed to be valid until
|
|
between calls to Pa_Initialize() and Pa_Terminate().
|
|
*/
|
|
|
|
const PaDeviceInfo* Pa_GetDeviceInfo( PaDeviceID devID );
|
|
|
|
/*
|
|
PortAudioCallback is implemented by clients of the portable audio api.
|
|
|
|
inputBuffer and outputBuffer are arrays of interleaved samples,
|
|
the format, packing and number of channels used by the buffers are
|
|
determined by parameters to Pa_OpenStream() (see below).
|
|
|
|
framesPerBuffer is the number of sample frames to be processed by the callback.
|
|
|
|
outTime is the time in samples when the buffer(s) processed by
|
|
this callback will begin being played at the audio output.
|
|
See also Pa_StreamTime()
|
|
|
|
userData is the value of a user supplied pointer passed to Pa_OpenStream()
|
|
intended for storing synthesis data etc.
|
|
|
|
return value:
|
|
The callback can return a nonzero value to stop the stream. This may be
|
|
useful in applications such as soundfile players where a specific duration
|
|
of output is required. However, it is not necessary to utilise this mechanism
|
|
as StopStream() will also terminate the stream. A callback returning a
|
|
nonzero value must fill the entire outputBuffer.
|
|
|
|
NOTE: None of the other stream functions may be called from within the
|
|
callback function except for Pa_GetCPULoad().
|
|
|
|
*/
|
|
|
|
typedef int (PortAudioCallback)(
|
|
void *inputBuffer, void *outputBuffer,
|
|
unsigned long framesPerBuffer,
|
|
PaTimestamp outTime, void *userData );
|
|
|
|
|
|
/*
|
|
Stream flags
|
|
|
|
These flags may be supplied (ored together) in the streamFlags argument to
|
|
the Pa_OpenStream() function.
|
|
|
|
[ suggestions? ]
|
|
*/
|
|
|
|
#define paNoFlag (0)
|
|
#define paClipOff (1<<0) /* disable defult clipping of out of range samples */
|
|
#define paDitherOff (1<<1) /* disable default dithering */
|
|
#define paPlatformSpecificFlags (0x00010000)
|
|
typedef unsigned long PaStreamFlags;
|
|
|
|
/*
|
|
A single PortAudioStream provides multiple channels of real-time
|
|
input and output audio streaming to a client application.
|
|
Pointers to PortAudioStream objects are passed between PortAudio functions.
|
|
*/
|
|
|
|
typedef void PortAudioStream;
|
|
#define PaStream PortAudioStream
|
|
|
|
/*
|
|
Pa_OpenStream() opens a stream for either input, output or both.
|
|
|
|
stream is the address of a PortAudioStream pointer which will receive
|
|
a pointer to the newly opened stream.
|
|
|
|
inputDevice is the id of the device used for input (see PaDeviceID above.)
|
|
inputDevice may be paNoDevice to indicate that an input device is not required.
|
|
|
|
numInputChannels is the number of channels of sound to be delivered to the
|
|
callback. It can range from 1 to the value of maxInputChannels in the
|
|
device input record for the device specified in the inputDevice parameter.
|
|
If inputDevice is paNoDevice numInputChannels is ignored.
|
|
|
|
inputSampleFormat is the format of inputBuffer provided to the callback
|
|
function. inputSampleFormat may be any of the formats described by the
|
|
PaSampleFormat enumeration (see above). PortAudio guarantees support for
|
|
the sound devices native formats (nativeSampleFormats in the device info
|
|
record) and additionally 16 and 32 bit integer and 32 bit floating point
|
|
formats. Support for other formats is implementation defined.
|
|
|
|
inputDriverInfo is a pointer to an optional driver specific data structure
|
|
containing additional information for device setup or stream processing.
|
|
inputDriverInfo is never required for correct operation. If not used
|
|
inputDriverInfo should be NULL.
|
|
|
|
outputDevice is the id of the device used for output (see PaDeviceID above.)
|
|
outputDevice may be paNoDevice to indicate that an output device is not required.
|
|
|
|
numOutputChannels is the number of channels of sound to be supplied by the
|
|
callback. See the definition of numInputChannels above for more details.
|
|
|
|
outputSampleFormat is the sample format of the outputBuffer filled by the
|
|
callback function. See the definition of inputSampleFormat above for more
|
|
details.
|
|
|
|
outputDriverInfo is a pointer to an optional driver specific data structure
|
|
containing additional information for device setup or stream processing.
|
|
outputDriverInfo is never required for correct operation. If not used
|
|
outputDriverInfo should be NULL.
|
|
|
|
sampleRate is the desired sampleRate for input and output
|
|
|
|
framesPerBuffer is the length in sample frames of all internal sample buffers
|
|
used for communication with platform specific audio routines. Wherever
|
|
possible this corresponds to the framesPerBuffer parameter passed to the
|
|
callback function.
|
|
|
|
numberOfBuffers is the number of buffers used for multibuffered
|
|
communication with the platform specific audio routines. This parameter is
|
|
provided only as a guide - and does not imply that an implementation must
|
|
use multibuffered i/o when reliable double buffering is available (such as
|
|
SndPlayDoubleBuffer() on the Macintosh.)
|
|
|
|
streamFlags may contain a combination of flags ORed together.
|
|
These flags modify the behavior of the
|
|
streaming process. Some flags may only be relevant to certain buffer formats.
|
|
|
|
callback is a pointer to a client supplied function that is responsible
|
|
for processing and filling input and output buffers (see above for details.)
|
|
|
|
userData is a client supplied pointer which is passed to the callback
|
|
function. It could for example, contain a pointer to instance data necessary
|
|
for processing the audio buffers.
|
|
|
|
return value:
|
|
Apon success Pa_OpenStream() returns PaNoError and places a pointer to a
|
|
valid PortAudioStream in the stream argument. The stream is inactive (stopped).
|
|
If a call to Pa_OpenStream() fails a nonzero error code is returned (see
|
|
PAError above) and the value of stream is invalid.
|
|
|
|
*/
|
|
|
|
PaError Pa_OpenStream( PortAudioStream** stream,
|
|
PaDeviceID inputDevice,
|
|
int numInputChannels,
|
|
PaSampleFormat inputSampleFormat,
|
|
void *inputDriverInfo,
|
|
PaDeviceID outputDevice,
|
|
int numOutputChannels,
|
|
PaSampleFormat outputSampleFormat,
|
|
void *outputDriverInfo,
|
|
double sampleRate,
|
|
unsigned long framesPerBuffer,
|
|
unsigned long numberOfBuffers,
|
|
PaStreamFlags streamFlags,
|
|
PortAudioCallback *callback,
|
|
void *userData );
|
|
|
|
|
|
/*
|
|
Pa_OpenDefaultStream() is a simplified version of Pa_OpenStream() that
|
|
opens the default input and/or ouput devices. Most parameters have
|
|
identical meaning to their Pa_OpenStream() counterparts, with the following
|
|
exceptions:
|
|
|
|
If either numInputChannels or numOutputChannels is 0 the respective device
|
|
is not opened (same as passing paNoDevice in the device arguments to Pa_OpenStream() )
|
|
|
|
sampleFormat applies to both the input and output buffers.
|
|
*/
|
|
|
|
PaError Pa_OpenDefaultStream( PortAudioStream** stream,
|
|
int numInputChannels,
|
|
int numOutputChannels,
|
|
PaSampleFormat sampleFormat,
|
|
double sampleRate,
|
|
unsigned long framesPerBuffer,
|
|
unsigned long numberOfBuffers,
|
|
PortAudioCallback *callback,
|
|
void *userData );
|
|
|
|
/*
|
|
Pa_CloseStream() closes an audio stream, flushing any pending buffers.
|
|
*/
|
|
|
|
PaError Pa_CloseStream( PortAudioStream* );
|
|
|
|
/*
|
|
Pa_StartStream() and Pa_StopStream() begin and terminate audio processing.
|
|
Pa_StopStream() waits until all pending audio buffers have been played.
|
|
Pa_AbortStream() stops playing immediately without waiting for pending
|
|
buffers to complete.
|
|
*/
|
|
|
|
PaError Pa_StartStream( PortAudioStream *stream );
|
|
|
|
PaError Pa_StopStream( PortAudioStream *stream );
|
|
|
|
PaError Pa_AbortStream( PortAudioStream *stream );
|
|
|
|
/*
|
|
Pa_StreamActive() returns one when the stream is playing audio,
|
|
zero when not playing, or a negative error number if the
|
|
stream is invalid.
|
|
The stream is active between calls to Pa_StartStream() and Pa_StopStream(),
|
|
but may also become inactive if the callback returns a non-zero value.
|
|
In the latter case, the stream is considered inactive after the last
|
|
buffer has finished playing.
|
|
*/
|
|
|
|
PaError Pa_StreamActive( PortAudioStream *stream );
|
|
|
|
/*
|
|
Pa_StreamTime() returns the current output time for the stream in samples.
|
|
This time may be used as a time reference (for example syncronising audio to
|
|
MIDI).
|
|
*/
|
|
|
|
PaTimestamp Pa_StreamTime( PortAudioStream *stream );
|
|
|
|
/*
|
|
The "CPU Load" is a fraction of total CPU time consumed by the
|
|
stream's audio processing.
|
|
A value of 0.5 would imply that PortAudio and the sound generating
|
|
callback was consuming roughly 50% of the available CPU time.
|
|
This function may be called from the callback function or the application.
|
|
*/
|
|
double Pa_GetCPULoad( PortAudioStream* stream );
|
|
|
|
/*
|
|
Use Pa_GetMinNumBuffers() to determine minimum number of buffers required for
|
|
the current host based on minimum latency.
|
|
On the PC, for the DirectSound implementation, latency can be optionally set
|
|
by user by setting an environment variable.
|
|
For example, to set latency to 200 msec, put:
|
|
|
|
set PA_MIN_LATENCY_MSEC=200
|
|
|
|
in the AUTOEXEC.BAT file and reboot.
|
|
If the environment variable is not set, then the latency will be determined
|
|
based on the OS. Windows NT has higher latency than Win95.
|
|
*/
|
|
|
|
int Pa_GetMinNumBuffers( int framesPerBuffer, double sampleRate );
|
|
|
|
/*
|
|
Sleep for at least 'msec' milliseconds.
|
|
You may sleep longer than the requested time so don't rely
|
|
on this for accurate musical timing.
|
|
*/
|
|
void Pa_Sleep( long msec );
|
|
|
|
/*
|
|
Return size in bytes of a single sample in a given PaSampleFormat
|
|
or paSampleFormatNotSupported.
|
|
*/
|
|
PaError Pa_GetSampleSize( PaSampleFormat format );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
#endif /* PORT_AUDIO_H */
|