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-rw-r--r--Game/Code/lib/portaudio/delphi/portaudio.pas2316
1 files changed, 1158 insertions, 1158 deletions
diff --git a/Game/Code/lib/portaudio/delphi/portaudio.pas b/Game/Code/lib/portaudio/delphi/portaudio.pas
index 94516c7a..b5b9f04e 100644
--- a/Game/Code/lib/portaudio/delphi/portaudio.pas
+++ b/Game/Code/lib/portaudio/delphi/portaudio.pas
@@ -1,1158 +1,1158 @@
-{*
- * $Id: portaudio.h,v 1.7 2007/08/16 20:45:34 richardash1981 Exp $
- * PortAudio Portable Real-Time Audio Library
- * PortAudio API Header File
- * Latest version available at: http://www.portaudio.com/
- *
- * Copyright (c) 1999-2002 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.
- *
- * 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.
- *}
-
-{*
- * The text above constitutes the entire PortAudio license; however,
- * the PortAudio community also makes the following non-binding requests:
- *
- * 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. It is also
- * requested that these non-binding requests be included along with the
- * license above.
- *}
-
-{** @file
- @brief The PortAudio API.
-*}
-
-unit portaudio;
-
-{$IFDEF FPC}
- {$PACKRECORDS C} (* GCC/Visual C/C++ compatible record packing *)
- {$MODE DELPHI }
-{$ENDIF}
-
-interface
-
-//uses;
-
-const
-{$IFDEF MSWINDOWS}
- LibName = 'portaudio_x86.dll';
-{$ENDIF}
-{$IFDEF LINUX}
- LibName = 'libportaudio.so';
-{$ENDIF}
-{$IFDEF DARWIN}
-// this is for portaudio version 19
- LibName = 'libportaudio.2.dylib';
- {$LINKLIB libportaudio.2}
-{$ENDIF}
-
-{** Retrieve the release number of the currently running PortAudio build,
- eg 1900.
-*}
-function Pa_GetVersion(): Integer; cdecl; external LibName;
-
-
-{** Retrieve a textual description of the current PortAudio build,
- eg "PortAudio V19-devel 13 October 2002".
-*}
-function Pa_GetVersionText(): PChar; cdecl; external LibName;
-
-
-{** Error codes returned by PortAudio functions.
- Note that with the exception of paNoError, all PaErrorCodes are negative.
-*}
-
-type TPaError = Integer;
-type TPaErrorCode = {enum}Integer; const
-{enum_begin PaErrorCode}
- paNoError = 0;
-
- paNotInitialized = -10000;
- paUnanticipatedHostError = (paNotInitialized+ 1);
- paInvalidChannelCount = (paNotInitialized+ 2);
- paInvalidSampleRate = (paNotInitialized+ 3);
- paInvalidDevice = (paNotInitialized+ 4);
- paInvalidFlag = (paNotInitialized+ 5);
- paSampleFormatNotSupported = (paNotInitialized+ 6);
- paBadIODeviceCombination = (paNotInitialized+ 7);
- paInsufficientMemory = (paNotInitialized+ 8);
- paBufferTooBig = (paNotInitialized+ 9);
- paBufferTooSmall = (paNotInitialized+10);
- paNullCallback = (paNotInitialized+11);
- paBadStreamPtr = (paNotInitialized+12);
- paTimedOut = (paNotInitialized+13);
- paInternalError = (paNotInitialized+14);
- paDeviceUnavailable = (paNotInitialized+15);
- paIncompatibleHostApiSpecificStreamInfo = (paNotInitialized+16);
- paStreamIsStopped = (paNotInitialized+17);
- paStreamIsNotStopped = (paNotInitialized+18);
- paInputOverflowed = (paNotInitialized+19);
- paOutputUnderflowed = (paNotInitialized+20);
- paHostApiNotFound = (paNotInitialized+21);
- paInvalidHostApi = (paNotInitialized+22);
- paCanNotReadFromACallbackStream = (paNotInitialized+23); {**< @todo review error code name *}
- paCanNotWriteToACallbackStream = (paNotInitialized+24); {**< @todo review error code name *}
- paCanNotReadFromAnOutputOnlyStream = (paNotInitialized+25); {**< @todo review error code name *}
- paCanNotWriteToAnInputOnlyStream = (paNotInitialized+26); {**< @todo review error code name *}
- paIncompatibleStreamHostApi = (paNotInitialized+27);
- paBadBufferPtr = (paNotInitialized+28);
-{enum_end PaErrorCode}
-
-
-{** Translate the supplied PortAudio error code into a human readable
- message.
-*}
-function Pa_GetErrorText( errorCode: TPaError ): PChar; cdecl; external LibName;
-
-
-{** Library initialization function - call this before using PortAudio.
- This function initialises internal data structures and prepares underlying
- host APIs for use. With the exception of Pa_GetVersion(), Pa_GetVersionText(),
- and Pa_GetErrorText(), this function MUST be called before using any other
- PortAudio API functions.
-
- If Pa_Initialize() is called multiple times, each successful
- call must be matched with a corresponding call to Pa_Terminate().
- Pairs of calls to Pa_Initialize()/Pa_Terminate() may overlap, and are not
- required to be fully nested.
-
- Note that if Pa_Initialize() returns an error code, Pa_Terminate() should
- NOT be called.
-
- @return paNoError if successful, otherwise an error code indicating the cause
- of failure.
-
- @see Pa_Terminate
-*}
-function Pa_Initialize(): TPaError; cdecl; external LibName;
-
-
-{** Library termination function - call this when finished using PortAudio.
- This function deallocates all resources allocated by PortAudio since it was
- initializied by a call to Pa_Initialize(). In cases where Pa_Initialise() has
- been called multiple times, each call must be matched with a corresponding call
- to Pa_Terminate(). The final matching call to Pa_Terminate() will automatically
- close any PortAudio streams that are still open.
-
- Pa_Terminate() MUST be called before exiting a program which uses PortAudio.
- Failure to do so may result in serious resource leaks, such as audio devices
- not being available until the next reboot.
-
- @return paNoError if successful, otherwise an error code indicating the cause
- of failure.
-
- @see Pa_Initialize
-*}
-function Pa_Terminate(): TPaError; cdecl; external LibName;
-
-
-
-{** The type used to refer to audio devices. Values of this type usually
- range from 0 to (Pa_GetDeviceCount()-1), and may also take on the PaNoDevice
- and paUseHostApiSpecificDeviceSpecification values.
-
- @see Pa_GetDeviceCount, paNoDevice, paUseHostApiSpecificDeviceSpecification
-*}
-type TPaDeviceIndex = Integer;
-
-
-{** A special PaDeviceIndex value indicating that no device is available,
- or should be used.
-
- @see PaDeviceIndex
-*}
-const paNoDevice = TPaDeviceIndex(-1);
-
-
-{** A special PaDeviceIndex value indicating that the device(s) to be used
- are specified in the host api specific stream info structure.
-
- @see PaDeviceIndex
-*}
-const paUseHostApiSpecificDeviceSpecification = TPaDeviceIndex(-2);
-
-
-{* Host API enumeration mechanism *}
-
-{** The type used to enumerate to host APIs at runtime. Values of this type
- range from 0 to (Pa_GetHostApiCount()-1).
-
- @see Pa_GetHostApiCount
-*}
-type TPaHostApiIndex = Integer;
-
-{** Retrieve the number of available host APIs. Even if a host API is
- available it may have no devices available.
-
- @return A non-negative value indicating the number of available host APIs
- or, a PaErrorCode (which are always negative) if PortAudio is not initialized
- or an error is encountered.
-
- @see PaHostApiIndex
-*}
-function Pa_GetHostApiCount(): TPaHostApiIndex; cdecl; external LibName;
-
-
-{** Retrieve the index of the default host API. The default host API will be
- the lowest common denominator host API on the current platform and is
- unlikely to provide the best performance.
-
- @return A non-negative value ranging from 0 to (Pa_GetHostApiCount()-1)
- indicating the default host API index or, a PaErrorCode (which are always
- negative) if PortAudio is not initialized or an error is encountered.
-*}
-function Pa_GetDefaultHostApi(): TPaHostApiIndex; cdecl; external LibName;
-
-
-{** Unchanging unique identifiers for each supported host API. This type
- is used in the PaHostApiInfo structure. The values are guaranteed to be
- unique and to never change, thus allowing code to be written that
- conditionally uses host API specific extensions.
-
- New type ids will be allocated when support for a host API reaches
- "public alpha" status, prior to that developers should use the
- paInDevelopment type id.
-
- @see PaHostApiInfo
-*}
-type TPaHostApiTypeId = {enum}Integer; const
-{enum_begin PaHostApiTypeId}
- paInDevelopment=0; {* use while developing support for a new host API *}
- paDirectSound=1;
- paMME=2;
- paASIO=3;
- paSoundManager=4;
- paCoreAudio=5;
- paOSS=7;
- paALSA=8;
- paAL=9;
- paBeOS=10;
- paWDMKS=11;
- paJACK=12;
- paWASAPI=13;
- paAudioScienceHPI=14;
-{enum_end PaHostApiTypeId}
-
-{** A structure containing information about a particular host API. *}
-
-type
- PPaHostApiInfo = ^TPaHostApiInfo;
- TPaHostApiInfo = record
- {** this is struct version 1 *}
- structVersion: Integer;
- {** The well known unique identifier of this host API @see PaHostApiTypeId *}
- _type: TPaHostApiTypeId;
- {** A textual description of the host API for display on user interfaces. *}
- name: PChar;
-
- {** The number of devices belonging to this host API. This field may be
- used in conjunction with Pa_HostApiDeviceIndexToDeviceIndex() to enumerate
- all devices for this host API.
- @see Pa_HostApiDeviceIndexToDeviceIndex
- *}
- deviceCount: Integer;
-
- {** The default input device for this host API. The value will be a
- device index ranging from 0 to (Pa_GetDeviceCount()-1), or paNoDevice
- if no default input device is available.
- *}
- defaultInputDevice: TPaDeviceIndex;
-
- {** The default output device for this host API. The value will be a
- device index ranging from 0 to (Pa_GetDeviceCount()-1), or paNoDevice
- if no default output device is available.
- *}
- defaultOutputDevice: TPaDeviceIndex;
- end;
-
-
-{** Retrieve a pointer to a structure containing information about a specific
- host Api.
-
- @param hostApi A valid host API index ranging from 0 to (Pa_GetHostApiCount()-1)
-
- @return A pointer to an immutable PaHostApiInfo structure describing
- a specific host API. If the hostApi parameter is out of range or an error
- is encountered, the function returns NULL.
-
- The returned structure is owned by the PortAudio implementation and must not
- be manipulated or freed. The pointer is only guaranteed to be valid between
- calls to Pa_Initialize() and Pa_Terminate().
-*}
-function Pa_GetHostApiInfo( hostApi: TPaHostApiIndex ): PPaHostApiInfo; cdecl; external LibName;
-
-
-{** Convert a static host API unique identifier, into a runtime
- host API index.
-
- @param type A unique host API identifier belonging to the PaHostApiTypeId
- enumeration.
-
- @return A valid PaHostApiIndex ranging from 0 to (Pa_GetHostApiCount()-1) or,
- a PaErrorCode (which are always negative) if PortAudio is not initialized
- or an error is encountered.
-
- The paHostApiNotFound error code indicates that the host API specified by the
- type parameter is not available.
-
- @see PaHostApiTypeId
-*}
-function Pa_HostApiTypeIdToHostApiIndex( _type: TPaHostApiTypeId ): TPaHostApiIndex; cdecl; external LibName;
-
-
-{** Convert a host-API-specific device index to standard PortAudio device index.
- This function may be used in conjunction with the deviceCount field of
- PaHostApiInfo to enumerate all devices for the specified host API.
-
- @param hostApi A valid host API index ranging from 0 to (Pa_GetHostApiCount()-1)
-
- @param hostApiDeviceIndex A valid per-host device index in the range
- 0 to (Pa_GetHostApiInfo(hostApi)->deviceCount-1)
-
- @return A non-negative PaDeviceIndex ranging from 0 to (Pa_GetDeviceCount()-1)
- or, a PaErrorCode (which are always negative) if PortAudio is not initialized
- or an error is encountered.
-
- A paInvalidHostApi error code indicates that the host API index specified by
- the hostApi parameter is out of range.
-
- A paInvalidDevice error code indicates that the hostApiDeviceIndex parameter
- is out of range.
-
- @see PaHostApiInfo
-*}
-function Pa_HostApiDeviceIndexToDeviceIndex( hostApi: TPaHostApiIndex;
- hostApiDeviceIndex: Integer ): TPaDeviceIndex; cdecl; external LibName;
-
-
-
-{** Structure used to return information about a host error condition.
-*}
-type
- PPaHostErrorInfo = ^TPaHostErrorInfo;
- TPaHostErrorInfo = record
- hostApiType: TPaHostApiTypeId; {**< the host API which returned the error code *}
- errorCode: Longint; {**< the error code returned *}
- errorText: PChar; {**< a textual description of the error if available, otherwise a zero-length string *}
- end;
-
-
-{** Return information about the last host error encountered. The error
- information returned by Pa_GetLastHostErrorInfo() will never be modified
- asyncronously by errors occurring in other PortAudio owned threads
- (such as the thread that manages the stream callback.)
-
- This function is provided as a last resort, primarily to enhance debugging
- by providing clients with access to all available error information.
-
- @return A pointer to an immutable structure constaining information about
- the host error. The values in this structure will only be valid if a
- PortAudio function has previously returned the paUnanticipatedHostError
- error code.
-*}
-function Pa_GetLastHostErrorInfo(): PPaHostErrorInfo; cdecl; external LibName;
-
-
-
-{* Device enumeration and capabilities *}
-
-{** Retrieve the number of available devices. The number of available devices
- may be zero.
-
- @return A non-negative value indicating the number of available devices or,
- a PaErrorCode (which are always negative) if PortAudio is not initialized
- or an error is encountered.
-*}
-function Pa_GetDeviceCount(): TPaDeviceIndex; cdecl; external LibName;
-
-
-{** Retrieve the index of the default input device. The result can be
- used in the inputDevice parameter to Pa_OpenStream().
-
- @return The default input device index for the default host API, or paNoDevice
- if no default input device is available or an error was encountered.
-*}
-function Pa_GetDefaultInputDevice(): TPaDeviceIndex; cdecl; external LibName;
-
-
-{** Retrieve the index of the default output device. The result can be
- used in the outputDevice parameter to Pa_OpenStream().
-
- @return The default output device index for the defualt host API, or paNoDevice
- if no default output device is available or an error was encountered.
-
- @note
- On the PC, the user can specify a default device by
- setting an environment variable. For example, to use device #1.
-<pre>
- set PA_RECOMMENDED_OUTPUT_DEVICE=1
-</pre>
- The user should first determine the available device ids by using
- the supplied application "pa_devs".
-*}
-function Pa_GetDefaultOutputDevice(): TPaDeviceIndex; cdecl; external LibName;
-
-
-{** The type used to represent monotonic time in seconds that can be used
- for syncronisation. The type is used for the outTime argument to the
- PaStreamCallback and as the result of Pa_GetStreamTime().
-
- @see PaStreamCallback, Pa_GetStreamTime
-*}
-type TPaTime = Double;
-
-
-{** A type used to specify one or more sample formats. Each value indicates
- a possible format for sound data passed to and from the stream callback,
- Pa_ReadStream and Pa_WriteStream.
-
- The standard formats paFloat32, paInt16, paInt32, paInt24, paInt8
- and aUInt8 are usually implemented by all implementations.
-
- The floating point representation (paFloat32) uses +1.0 and -1.0 as the
- maximum and minimum respectively.
-
- paUInt8 is an unsigned 8 bit format where 128 is considered "ground"
-
- The paNonInterleaved flag indicates that a multichannel buffer is passed
- as a set of non-interleaved pointers.
-
- @see Pa_OpenStream, Pa_OpenDefaultStream, PaDeviceInfo
- @see paFloat32, paInt16, paInt32, paInt24, paInt8
- @see paUInt8, paCustomFormat, paNonInterleaved
-*}
-type TPaSampleFormat = Longword;
-const
- paFloat32 = TPaSampleFormat($00000001); {**< @see PaSampleFormat *}
- paInt32 = TPaSampleFormat($00000002); {**< @see PaSampleFormat *}
- paInt24 = TPaSampleFormat($00000004); {**< Packed 24 bit format. @see PaSampleFormat *}
- paInt16 = TPaSampleFormat($00000008); {**< @see PaSampleFormat *}
- paInt8 = TPaSampleFormat($00000010); {**< @see PaSampleFormat *}
- paUInt8 = TPaSampleFormat($00000020); {**< @see PaSampleFormat *}
- paCustomFormat = TPaSampleFormat($00010000); {**< @see PaSampleFormat *}
- paNonInterleaved = TPaSampleFormat($80000000);
-
-{** A structure providing information and capabilities of PortAudio devices.
- Devices may support input, output or both input and output.
-*}
-type
- PPaDeviceInfo = ^TPaDeviceInfo;
- TPaDeviceInfo = record
- structVersion: Integer; {* this is struct version 2 *}
- name: PChar;
- hostApi: TPaHostApiIndex; {* note this is a host API index, not a type id*}
-
- maxInputChannels: Integer;
- maxOutputChannels: Integer;
-
- {* Default latency values for interactive performance. *}
- defaultLowInputLatency: TPaTime;
- defaultLowOutputLatency: TPaTime;
- {* Default latency values for robust non-interactive applications (eg. playing sound files). *}
- defaultHighInputLatency: TPaTime;
- defaultHighOutputLatency: TPaTime;
-
- defaultSampleRate: Double;
- end;
-
-
-{** Retrieve a pointer to a PaDeviceInfo structure containing information
- about the specified device.
- @return A pointer to an immutable PaDeviceInfo structure. If the device
- parameter is out of range the function returns NULL.
-
- @param device A valid device index in the range 0 to (Pa_GetDeviceCount()-1)
-
- @note PortAudio manages the memory referenced by the returned pointer,
- the client must not manipulate or free the memory. The pointer is only
- guaranteed to be valid between calls to Pa_Initialize() and Pa_Terminate().
-
- @see PaDeviceInfo, PaDeviceIndex
-*}
-function Pa_GetDeviceInfo( device: TPaDeviceIndex ): PPaDeviceInfo; cdecl; external LibName;
-
-
-{** Parameters for one direction (input or output) of a stream.
-*}
-type
- PPaStreamParameters = ^TPaStreamParameters;
- TPaStreamParameters = record
- {** A valid device index in the range 0 to (Pa_GetDeviceCount()-1)
- specifying the device to be used or the special constant
- paUseHostApiSpecificDeviceSpecification which indicates that the actual
- device(s) to use are specified in hostApiSpecificStreamInfo.
- This field must not be set to paNoDevice.
- *}
- device: TPaDeviceIndex;
-
- {** The number of channels of sound to be delivered to the
- stream callback or accessed by Pa_ReadStream() or Pa_WriteStream().
- It can range from 1 to the value of maxInputChannels in the
- PaDeviceInfo record for the device specified by the device parameter.
- *}
- channelCount: Integer;
-
- {** The sample format of the buffer provided to the stream callback,
- a_ReadStream() or Pa_WriteStream(). It may be any of the formats described
- by the PaSampleFormat enumeration.
- *}
- sampleFormat: TPaSampleFormat;
-
- {** The desired latency in seconds. Where practical, implementations should
- configure their latency based on these parameters, otherwise they may
- choose the closest viable latency instead. Unless the suggested latency
- is greater than the absolute upper limit for the device implementations
- should round the suggestedLatency up to the next practial value - ie to
- provide an equal or higher latency than suggestedLatency wherever possibe.
- Actual latency values for an open stream may be retrieved using the
- inputLatency and outputLatency fields of the PaStreamInfo structure
- returned by Pa_GetStreamInfo().
- @see default*Latency in PaDeviceInfo, *Latency in PaStreamInfo
- *}
- suggestedLatency: TPaTime;
-
- {** An optional pointer to a host api specific data structure
- containing additional information for device setup and/or stream processing.
- hostApiSpecificStreamInfo is never required for correct operation,
- if not used it should be set to NULL.
- *}
- hostApiSpecificStreamInfo: Pointer;
- end;
-
-
-{** Return code for Pa_IsFormatSupported indicating success. *}
-const paFormatIsSupported = (0);
-
-{** Determine whether it would be possible to open a stream with the specified
- parameters.
-
- @param inputParameters A structure that describes the input parameters used to
- open a stream. The suggestedLatency field is ignored. See PaStreamParameters
- for a description of these parameters. inputParameters must be NULL for
- output-only streams.
-
- @param outputParameters A structure that describes the output parameters used
- to open a stream. The suggestedLatency field is ignored. See PaStreamParameters
- for a description of these parameters. outputParameters must be NULL for
- input-only streams.
-
- @param sampleRate The required sampleRate. For full-duplex streams it is the
- sample rate for both input and output
-
- @return Returns 0 if the format is supported, and an error code indicating why
- the format is not supported otherwise. The constant paFormatIsSupported is
- provided to compare with the return value for success.
-
- @see paFormatIsSupported, PaStreamParameters
-*}
-function Pa_IsFormatSupported( inputParameters: PPaStreamParameters;
- outputParameters: PPaStreamParameters;
- sampleRate: Double ): TPaError; cdecl; external LibName;
-
-
-
-{* Streaming types and functions *}
-
-
-{**
- A single PaStream can provide multiple channels of real-time
- streaming audio input and output to a client application. A stream
- provides access to audio hardware represented by one or more
- PaDevices. Depending on the underlying Host API, it may be possible
- to open multiple streams using the same device, however this behavior
- is implementation defined. Portable applications should assume that
- a PaDevice may be simultaneously used by at most one PaStream.
-
- Pointers to PaStream objects are passed between PortAudio functions that
- operate on streams.
-
- @see Pa_OpenStream, Pa_OpenDefaultStream, Pa_OpenDefaultStream, Pa_CloseStream,
- Pa_StartStream, Pa_StopStream, Pa_AbortStream, Pa_IsStreamActive,
- Pa_GetStreamTime, Pa_GetStreamCpuLoad
-
-*}
-type
- PPaStream = Pointer;
-
-{** Can be passed as the framesPerBuffer parameter to Pa_OpenStream()
- or Pa_OpenDefaultStream() to indicate that the stream callback will
- accept buffers of any size.
-*}
-const paFramesPerBufferUnspecified = (0);
-
-
-{** Flags used to control the behavior of a stream. They are passed as
- parameters to Pa_OpenStream or Pa_OpenDefaultStream. Multiple flags may be
- ORed together.
-
- @see Pa_OpenStream, Pa_OpenDefaultStream
- @see paNoFlag, paClipOff, paDitherOff, paNeverDropInput,
- paPrimeOutputBuffersUsingStreamCallback, paPlatformSpecificFlags
-*}
-type TPaStreamFlags = Longword;
-
-{** @see PaStreamFlags *}
-const paNoFlag = TPaStreamFlags(0);
-
-{** Disable default clipping of out of range samples.
- @see PaStreamFlags
-*}
-const paClipOff = TPaStreamFlags($00000001);
-
-{** Disable default dithering.
- @see PaStreamFlags
-*}
-const paDitherOff = TPaStreamFlags($00000002);
-
-{** Flag requests that where possible a full duplex stream will not discard
- overflowed input samples without calling the stream callback. This flag is
- only valid for full duplex callback streams and only when used in combination
- with the paFramesPerBufferUnspecified (0) framesPerBuffer parameter. Using
- this flag incorrectly results in a paInvalidFlag error being returned from
- Pa_OpenStream and Pa_OpenDefaultStream.
-
- @see PaStreamFlags, paFramesPerBufferUnspecified
-*}
-const paNeverDropInput = TPaStreamFlags($00000004);
-
-{** Call the stream callback to fill initial output buffers, rather than the
- default behavior of priming the buffers with zeros (silence). This flag has
- no effect for input-only and blocking read/write streams.
-
- @see PaStreamFlags
-*}
-const paPrimeOutputBuffersUsingStreamCallback = TPaStreamFlags($00000008);
-
-{** A mask specifying the platform specific bits.
- @see PaStreamFlags
-*}
-const paPlatformSpecificFlags = TPaStreamFlags($FFFF0000);
-
-{**
- Timing information for the buffers passed to the stream callback.
-*}
-type
- PPaStreamCallbackTimeInfo = ^TPaStreamCallbackTimeInfo;
- TPaStreamCallbackTimeInfo = record
- inputBufferAdcTime: TPaTime;
- currentTime: TPaTime;
- outputBufferDacTime: TPaTime;
- end;
-
-
-{**
- Flag bit constants for the statusFlags to PaStreamCallback.
-
- @see paInputUnderflow, paInputOverflow, paOutputUnderflow, paOutputOverflow,
- paPrimingOutput
-*}
-type TPaStreamCallbackFlags = Longword;
-
-{** In a stream opened with paFramesPerBufferUnspecified, indicates that
- input data is all silence (zeros) because no real data is available. In a
- stream opened without paFramesPerBufferUnspecified, it indicates that one or
- more zero samples have been inserted into the input buffer to compensate
- for an input underflow.
- @see PaStreamCallbackFlags
-*}
-const paInputUnderflow = TPaStreamCallbackFlags($00000001);
-
-{** In a stream opened with paFramesPerBufferUnspecified, indicates that data
- prior to the first sample of the input buffer was discarded due to an
- overflow, possibly because the stream callback is using too much CPU time.
- Otherwise indicates that data prior to one or more samples in the
- input buffer was discarded.
- @see PaStreamCallbackFlags
-*}
-const paInputOverflow = TPaStreamCallbackFlags($00000002);
-
-{** Indicates that output data (or a gap) was inserted, possibly because the
- stream callback is using too much CPU time.
- @see PaStreamCallbackFlags
-*}
-const paOutputUnderflow = TPaStreamCallbackFlags($00000004);
-
-{** Indicates that output data will be discarded because no room is available.
- @see PaStreamCallbackFlags
-*}
-const paOutputOverflow = TPaStreamCallbackFlags($00000008);
-
-{** Some of all of the output data will be used to prime the stream, input
- data may be zero.
- @see PaStreamCallbackFlags
-*}
-const paPrimingOutput = TPaStreamCallbackFlags($00000010);
-
-{**
- Allowable return values for the PaStreamCallback.
- @see PaStreamCallback
-*}
-type TPaStreamCallbackResult = {enum}Integer; const
-{enum_begin PaStreamCallbackResult}
- paContinue=0;
- paComplete=1;
- paAbort=2;
-{enum_end PaStreamCallbackResult}
-
-{**
- Functions of type PaStreamCallback are implemented by PortAudio clients.
- They consume, process or generate audio in response to requests from an
- active PortAudio stream.
-
- @param input and @param output are arrays of interleaved samples,
- the format, packing and number of channels used by the buffers are
- determined by parameters to Pa_OpenStream().
-
- @param frameCount The number of sample frames to be processed by
- the stream callback.
-
- @param timeInfo The time in seconds when the first sample of the input
- buffer was received at the audio input, the time in seconds when the first
- sample of the output buffer will begin being played at the audio output, and
- the time in seconds when the stream callback was called.
- See also Pa_GetStreamTime()
-
- @param statusFlags Flags indicating whether input and/or output buffers
- have been inserted or will be dropped to overcome underflow or overflow
- conditions.
-
- @param userData The value of a user supplied pointer passed to
- Pa_OpenStream() intended for storing synthesis data etc.
-
- @return
- The stream callback should return one of the values in the
- PaStreamCallbackResult enumeration. To ensure that the callback continues
- to be called, it should return paContinue (0). Either paComplete or paAbort
- can be returned to finish stream processing, after either of these values is
- returned the callback will not be called again. If paAbort is returned the
- stream will finish as soon as possible. If paComplete is returned, the stream
- will continue until all buffers generated by the callback have been played.
- 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 Pa_StopStream(), Pa_AbortStream() or Pa_CloseStream() can also
- be used to stop the stream. The callback must always fill the entire output
- buffer irrespective of its return value.
-
- @see Pa_OpenStream, Pa_OpenDefaultStream
-
- @note With the exception of Pa_GetStreamCpuLoad() it is not permissable to call
- PortAudio API functions from within the stream callback.
-*}
-type
- PPaStreamCallback = ^TPaStreamCallback;
- TPaStreamCallback = function(
- input: Pointer; output: Pointer;
- frameCount: Longword;
- timeInfo: PPaStreamCallbackTimeInfo;
- statusFlags: TPaStreamCallbackFlags;
- userData: Pointer ): Integer; cdecl;
-
-
-{** Opens a stream for either input, output or both.
-
- @param stream The address of a PaStream pointer which will receive
- a pointer to the newly opened stream.
-
- @param inputParameters A structure that describes the input parameters used by
- the opened stream. See PaStreamParameters for a description of these parameters.
- inputParameters must be NULL for output-only streams.
-
- @param outputParameters A structure that describes the output parameters used by
- the opened stream. See PaStreamParameters for a description of these parameters.
- outputParameters must be NULL for input-only streams.
-
- @param sampleRate The desired sampleRate. For full-duplex streams it is the
- sample rate for both input and output
-
- @param framesPerBuffer The number of frames passed to the stream callback
- function, or the preferred block granularity for a blocking read/write stream.
- The special value paFramesPerBufferUnspecified (0) may be used to request that
- the stream callback will recieve an optimal (and possibly varying) number of
- frames based on host requirements and the requested latency settings.
- Note: With some host APIs, the use of non-zero framesPerBuffer for a callback
- stream may introduce an additional layer of buffering which could introduce
- additional latency. PortAudio guarantees that the additional latency
- will be kept to the theoretical minimum however, it is strongly recommended
- that a non-zero framesPerBuffer value only be used when your algorithm
- requires a fixed number of frames per stream callback.
-
- @param streamFlags Flags which modify the behaviour of the streaming process.
- This parameter may contain a combination of flags ORed together. Some flags may
- only be relevant to certain buffer formats.
-
- @param streamCallback A pointer to a client supplied function that is responsible
- for processing and filling input and output buffers. If this parameter is NULL
- the stream will be opened in 'blocking read/write' mode. In blocking mode,
- the client can receive sample data using Pa_ReadStream and write sample data
- using Pa_WriteStream, the number of samples that may be read or written
- without blocking is returned by Pa_GetStreamReadAvailable and
- Pa_GetStreamWriteAvailable respectively.
-
- @param userData A client supplied pointer which is passed to the stream callback
- function. It could for example, contain a pointer to instance data necessary
- for processing the audio buffers. This parameter is ignored if streamCallback
- is NULL.
-
- @return
- Upon success Pa_OpenStream() returns paNoError and places a pointer to a
- valid PaStream in the stream argument. The stream is inactive (stopped).
- If a call to Pa_OpenStream() fails, a non-zero error code is returned (see
- PaError for possible error codes) and the value of stream is invalid.
-
- @see PaStreamParameters, PaStreamCallback, Pa_ReadStream, Pa_WriteStream,
- Pa_GetStreamReadAvailable, Pa_GetStreamWriteAvailable
-*}
-function Pa_OpenStream( var stream: PPaStream;
- inputParameters: PPaStreamParameters;
- outputParameters: PPaStreamParameters;
- sampleRate: Double;
- framesPerBuffer: Longword;
- streamFlags: TPaStreamFlags;
- streamCallback: PPaStreamCallback;
- userData: Pointer ): TPaError; cdecl; external LibName;
-
-
-{** A simplified version of Pa_OpenStream() that opens the default input
- and/or output devices.
-
- @param stream The address of a PaStream pointer which will receive
- a pointer to the newly opened stream.
-
- @param numInputChannels The number of channels of sound that will be supplied
- to the stream callback or returned by Pa_ReadStream. It can range from 1 to
- the value of maxInputChannels in the PaDeviceInfo record for the default input
- device. If 0 the stream is opened as an output-only stream.
-
- @param numOutputChannels The number of channels of sound to be delivered to the
- stream callback or passed to Pa_WriteStream. It can range from 1 to the value
- of maxOutputChannels in the PaDeviceInfo record for the default output dvice.
- If 0 the stream is opened as an output-only stream.
-
- @param sampleFormat The sample format of both the input and output buffers
- provided to the callback or passed to and from Pa_ReadStream and Pa_WriteStream.
- sampleFormat may be any of the formats described by the PaSampleFormat
- enumeration.
-
- @param sampleRate Same as Pa_OpenStream parameter of the same name.
- @param framesPerBuffer Same as Pa_OpenStream parameter of the same name.
- @param streamCallback Same as Pa_OpenStream parameter of the same name.
- @param userData Same as Pa_OpenStream parameter of the same name.
-
- @return As for Pa_OpenStream
-
- @see Pa_OpenStream, PaStreamCallback
-*}
-function Pa_OpenDefaultStream( var stream: PPaStream;
- numInputChannels: Integer;
- numOutputChannels: Integer;
- sampleFormat: TPaSampleFormat;
- sampleRate: Double;
- framesPerBuffer: Longword;
- streamCallback: PPaStreamCallback;
- userData: Pointer ): TPaError; cdecl; external LibName;
-
-
-{** Closes an audio stream. If the audio stream is active it
- discards any pending buffers as if Pa_AbortStream() had been called.
-*}
-function Pa_CloseStream( stream: PPaStream ): TPaError; cdecl; external LibName;
-
-
-{** Functions of type PaStreamFinishedCallback are implemented by PortAudio
- clients. They can be registered with a stream using the Pa_SetStreamFinishedCallback
- function. Once registered they are called when the stream becomes inactive
- (ie once a call to Pa_StopStream() will not block).
- A stream will become inactive after the stream callback returns non-zero,
- or when Pa_StopStream or Pa_AbortStream is called. For a stream providing audio
- output, if the stream callback returns paComplete, or Pa_StopStream is called,
- the stream finished callback will not be called until all generated sample data
- has been played.
-
- @param userData The userData parameter supplied to Pa_OpenStream()
-
- @see Pa_SetStreamFinishedCallback
-*}
-type
- PPaStreamFinishedCallback = ^TPaStreamFinishedCallback;
- TPaStreamFinishedCallback = procedure( userData: Pointer ); cdecl;
-
-
-{** Register a stream finished callback function which will be called when the
- stream becomes inactive. See the description of PaStreamFinishedCallback for
- further details about when the callback will be called.
-
- @param stream a pointer to a PaStream that is in the stopped state - if the
- stream is not stopped, the stream's finished callback will remain unchanged
- and an error code will be returned.
-
- @param streamFinishedCallback a pointer to a function with the same signature
- as PaStreamFinishedCallback, that will be called when the stream becomes
- inactive. Passing NULL for this parameter will un-register a previously
- registered stream finished callback function.
-
- @return on success returns paNoError, otherwise an error code indicating the cause
- of the error.
-
- @see PaStreamFinishedCallback
-*}
-function Pa_SetStreamFinishedCallback( stream: PPaStream;
- streamFinishedCallback: PPaStreamFinishedCallback ): TPaError; cdecl; external LibName;
-
-
-{** Commences audio processing.
-*}
-function Pa_StartStream( stream: PPaStream ): TPaError; cdecl; external LibName;
-
-
-{** Terminates audio processing. It waits until all pending
- audio buffers have been played before it returns.
-*}
-function Pa_StopStream( stream: PPaStream ): TPaError; cdecl; external LibName;
-
-
-{** Terminates audio processing immediately without waiting for pending
- buffers to complete.
-*}
-function Pa_AbortStream( stream: PPaStream ): TPaError; cdecl; external LibName;
-
-
-{** Determine whether the stream is stopped.
- A stream is considered to be stopped prior to a successful call to
- Pa_StartStream and after a successful call to Pa_StopStream or Pa_AbortStream.
- If a stream callback returns a value other than paContinue the stream is NOT
- considered to be stopped.
-
- @return Returns one (1) when the stream is stopped, zero (0) when
- the stream is running or, a PaErrorCode (which are always negative) if
- PortAudio is not initialized or an error is encountered.
-
- @see Pa_StopStream, Pa_AbortStream, Pa_IsStreamActive
-*}
-function Pa_IsStreamStopped( stream: PPaStream ): TPaError; cdecl; external LibName;
-
-
-{** Determine whether the stream is active.
- A stream is active after a successful call to Pa_StartStream(), until it
- becomes inactive either as a result of a call to Pa_StopStream() or
- Pa_AbortStream(), or as a result of a return value other than paContinue from
- the stream callback. In the latter case, the stream is considered inactive
- after the last buffer has finished playing.
-
- @return Returns one (1) when the stream is active (ie playing or recording
- audio), zero (0) when not playing or, a PaErrorCode (which are always negative)
- if PortAudio is not initialized or an error is encountered.
-
- @see Pa_StopStream, Pa_AbortStream, Pa_IsStreamStopped
-*}
-function Pa_IsStreamActive( stream: PPaStream ): TPaError; cdecl; external LibName;
-
-
-
-{** A structure containing unchanging information about an open stream.
- @see Pa_GetStreamInfo
-*}
-type
- PPaStreamInfo = ^TPaStreamInfo;
- TPaStreamInfo = record
- {** this is struct version 1 *}
- structVersion: Integer;
-
- {** The input latency of the stream in seconds. This value provides the most
- accurate estimate of input latency available to the implementation. It may
- differ significantly from the suggestedLatency value passed to Pa_OpenStream().
- The value of this field will be zero (0.) for output-only streams.
- @see PaTime
- *}
- inputLatency: TPaTime;
-
- {** The output latency of the stream in seconds. This value provides the most
- accurate estimate of output latency available to the implementation. It may
- differ significantly from the suggestedLatency value passed to Pa_OpenStream().
- The value of this field will be zero (0.) for input-only streams.
- @see PaTime
- *}
- outputLatency: TPaTime;
-
- {** The sample rate of the stream in Hertz (samples per second). In cases
- where the hardware sample rate is inaccurate and PortAudio is aware of it,
- the value of this field may be different from the sampleRate parameter
- passed to Pa_OpenStream(). If information about the actual hardware sample
- rate is not available, this field will have the same value as the sampleRate
- parameter passed to Pa_OpenStream().
- *}
- sampleRate: Double;
- end;
-
-
-{** Retrieve a pointer to a PaStreamInfo structure containing information
- about the specified stream.
- @return A pointer to an immutable PaStreamInfo structure. If the stream
- parameter invalid, or an error is encountered, the function returns NULL.
-
- @param stream A pointer to an open stream previously created with Pa_OpenStream.
-
- @note PortAudio manages the memory referenced by the returned pointer,
- the client must not manipulate or free the memory. The pointer is only
- guaranteed to be valid until the specified stream is closed.
-
- @see PaStreamInfo
-*}
-function Pa_GetStreamInfo( stream: PPaStream ): PPaStreamInfo; cdecl; external LibName;
-
-
-{** Determine the current time for the stream according to the same clock used
- to generate buffer timestamps. This time may be used for syncronising other
- events to the audio stream, for example synchronizing audio to MIDI.
-
- @return The stream's current time in seconds, or 0 if an error occurred.
-
- @see PaTime, PaStreamCallback
-*}
-function Pa_GetStreamTime( stream: PPaStream ): TPaTime; cdecl; external LibName;
-
-
-{** Retrieve CPU usage information for the specified stream.
- The "CPU Load" is a fraction of total CPU time consumed by a callback stream's
- audio processing routines including, but not limited to the client supplied
- stream callback. This function does not work with blocking read/write streams.
-
- This function may be called from the stream callback function or the
- application.
-
- @return
- A floating point value, typically between 0.0 and 1.0, where 1.0 indicates
- that the stream callback is consuming the maximum number of CPU cycles possible
- to maintain real-time operation. A value of 0.5 would imply that PortAudio and
- the stream callback was consuming roughly 50% of the available CPU time. The
- return value may exceed 1.0. A value of 0.0 will always be returned for a
- blocking read/write stream, or if an error occurrs.
-*}
-function Pa_GetStreamCpuLoad( stream: PPaStream ): Double; cdecl; external LibName;
-
-
-{** Read samples from an input stream. The function doesn't return until
- the entire buffer has been filled - this may involve waiting for the operating
- system to supply the data.
-
- @param stream A pointer to an open stream previously created with Pa_OpenStream.
-
- @param buffer A pointer to a buffer of sample frames. The buffer contains
- samples in the format specified by the inputParameters->sampleFormat field
- used to open the stream, and the number of channels specified by
- inputParameters->numChannels. If non-interleaved samples were requested,
- buffer is a pointer to the first element of an array of non-interleaved
- buffer pointers, one for each channel.
-
- @param frames The number of frames to be read into buffer. This parameter
- is not constrained to a specific range, however high performance applications
- will want to match this parameter to the framesPerBuffer parameter used
- when opening the stream.
-
- @return On success PaNoError will be returned, or PaInputOverflowed if input
- data was discarded by PortAudio after the previous call and before this call.
-*}
-function Pa_ReadStream( stream: PPaStream;
- buffer: Pointer;
- frames: Longword ): TPaError; cdecl; external LibName;
-
-
-{** Write samples to an output stream. This function doesn't return until the
- entire buffer has been consumed - this may involve waiting for the operating
- system to consume the data.
-
- @param stream A pointer to an open stream previously created with Pa_OpenStream.
-
- @param buffer A pointer to a buffer of sample frames. The buffer contains
- samples in the format specified by the outputParameters->sampleFormat field
- used to open the stream, and the number of channels specified by
- outputParameters->numChannels. If non-interleaved samples were requested,
- buffer is a pointer to the first element of an array of non-interleaved
- buffer pointers, one for each channel.
-
- @param frames The number of frames to be written from buffer. This parameter
- is not constrained to a specific range, however high performance applications
- will want to match this parameter to the framesPerBuffer parameter used
- when opening the stream.
-
- @return On success PaNoError will be returned, or paOutputUnderflowed if
- additional output data was inserted after the previous call and before this
- call.
-*}
-function Pa_WriteStream( stream: PPaStream;
- buffer: Pointer;
- frames: Longword ): TPaError; cdecl; external LibName;
-
-
-{** Retrieve the number of frames that can be read from the stream without
- waiting.
-
- @return Returns a non-negative value representing the maximum number of frames
- that can be read from the stream without blocking or busy waiting or, a
- PaErrorCode (which are always negative) if PortAudio is not initialized or an
- error is encountered.
-*}
-function Pa_GetStreamReadAvailable( stream: PPaStream ): Longint; cdecl; external LibName;
-
-
-{** Retrieve the number of frames that can be written to the stream without
- waiting.
-
- @return Returns a non-negative value representing the maximum number of frames
- that can be written to the stream without blocking or busy waiting or, a
- PaErrorCode (which are always negative) if PortAudio is not initialized or an
- error is encountered.
-*}
-function Pa_GetStreamWriteAvailable( stream: PPaStream ): Longint; cdecl; external LibName;
-
-
-{** Retrieve the host type handling an open stream.
-
- @return Returns a non-negative value representing the host API type
- handling an open stream or, a PaErrorCode (which are always negative)
- if PortAudio is not initialized or an error is encountered.
-*}
-function Pa_GetStreamHostApiType( stream: PPaStream ): TPaHostApiTypeId; cdecl; external LibName;
-
-
-{* Miscellaneous utilities *}
-
-
-{** Retrieve the size of a given sample format in bytes.
-
- @return The size in bytes of a single sample in the specified format,
- or paSampleFormatNotSupported if the format is not supported.
-*}
-function Pa_GetSampleSize( format: TPaSampleFormat ): TPaError; cdecl; external LibName;
-
-
-{** Put the caller to sleep for at least 'msec' milliseconds. This function is
- provided only as a convenience for authors of portable code (such as the tests
- and examples in the PortAudio distribution.)
-
- The function may sleep longer than requested so don't rely on this for accurate
- musical timing.
-*}
-procedure Pa_Sleep( msec: Longint ); cdecl; external LibName;
-
-implementation
-
-end.
+{*
+ * $Id: portaudio.h,v 1.7 2007/08/16 20:45:34 richardash1981 Exp $
+ * PortAudio Portable Real-Time Audio Library
+ * PortAudio API Header File
+ * Latest version available at: http://www.portaudio.com/
+ *
+ * Copyright (c) 1999-2002 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.
+ *
+ * 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.
+ *}
+
+{*
+ * The text above constitutes the entire PortAudio license; however,
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * 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. It is also
+ * requested that these non-binding requests be included along with the
+ * license above.
+ *}
+
+{** @file
+ @brief The PortAudio API.
+*}
+
+unit portaudio;
+
+{$IFDEF FPC}
+ {$PACKRECORDS C} (* GCC/Visual C/C++ compatible record packing *)
+ {$MODE DELPHI }
+{$ENDIF}
+
+interface
+
+//uses;
+
+const
+{$IFDEF MSWINDOWS}
+ LibName = 'portaudio_x86.dll';
+{$ENDIF}
+{$IFDEF LINUX}
+ LibName = 'libportaudio.so';
+{$ENDIF}
+{$IFDEF DARWIN}
+// this is for portaudio version 19
+ LibName = 'libportaudio.2.dylib';
+ {$LINKLIB libportaudio.2}
+{$ENDIF}
+
+{** Retrieve the release number of the currently running PortAudio build,
+ eg 1900.
+*}
+function Pa_GetVersion(): Integer; cdecl; external LibName;
+
+
+{** Retrieve a textual description of the current PortAudio build,
+ eg "PortAudio V19-devel 13 October 2002".
+*}
+function Pa_GetVersionText(): PChar; cdecl; external LibName;
+
+
+{** Error codes returned by PortAudio functions.
+ Note that with the exception of paNoError, all PaErrorCodes are negative.
+*}
+
+type TPaError = Integer;
+type TPaErrorCode = {enum}Integer; const
+{enum_begin PaErrorCode}
+ paNoError = 0;
+
+ paNotInitialized = -10000;
+ paUnanticipatedHostError = (paNotInitialized+ 1);
+ paInvalidChannelCount = (paNotInitialized+ 2);
+ paInvalidSampleRate = (paNotInitialized+ 3);
+ paInvalidDevice = (paNotInitialized+ 4);
+ paInvalidFlag = (paNotInitialized+ 5);
+ paSampleFormatNotSupported = (paNotInitialized+ 6);
+ paBadIODeviceCombination = (paNotInitialized+ 7);
+ paInsufficientMemory = (paNotInitialized+ 8);
+ paBufferTooBig = (paNotInitialized+ 9);
+ paBufferTooSmall = (paNotInitialized+10);
+ paNullCallback = (paNotInitialized+11);
+ paBadStreamPtr = (paNotInitialized+12);
+ paTimedOut = (paNotInitialized+13);
+ paInternalError = (paNotInitialized+14);
+ paDeviceUnavailable = (paNotInitialized+15);
+ paIncompatibleHostApiSpecificStreamInfo = (paNotInitialized+16);
+ paStreamIsStopped = (paNotInitialized+17);
+ paStreamIsNotStopped = (paNotInitialized+18);
+ paInputOverflowed = (paNotInitialized+19);
+ paOutputUnderflowed = (paNotInitialized+20);
+ paHostApiNotFound = (paNotInitialized+21);
+ paInvalidHostApi = (paNotInitialized+22);
+ paCanNotReadFromACallbackStream = (paNotInitialized+23); {**< @todo review error code name *}
+ paCanNotWriteToACallbackStream = (paNotInitialized+24); {**< @todo review error code name *}
+ paCanNotReadFromAnOutputOnlyStream = (paNotInitialized+25); {**< @todo review error code name *}
+ paCanNotWriteToAnInputOnlyStream = (paNotInitialized+26); {**< @todo review error code name *}
+ paIncompatibleStreamHostApi = (paNotInitialized+27);
+ paBadBufferPtr = (paNotInitialized+28);
+{enum_end PaErrorCode}
+
+
+{** Translate the supplied PortAudio error code into a human readable
+ message.
+*}
+function Pa_GetErrorText( errorCode: TPaError ): PChar; cdecl; external LibName;
+
+
+{** Library initialization function - call this before using PortAudio.
+ This function initialises internal data structures and prepares underlying
+ host APIs for use. With the exception of Pa_GetVersion(), Pa_GetVersionText(),
+ and Pa_GetErrorText(), this function MUST be called before using any other
+ PortAudio API functions.
+
+ If Pa_Initialize() is called multiple times, each successful
+ call must be matched with a corresponding call to Pa_Terminate().
+ Pairs of calls to Pa_Initialize()/Pa_Terminate() may overlap, and are not
+ required to be fully nested.
+
+ Note that if Pa_Initialize() returns an error code, Pa_Terminate() should
+ NOT be called.
+
+ @return paNoError if successful, otherwise an error code indicating the cause
+ of failure.
+
+ @see Pa_Terminate
+*}
+function Pa_Initialize(): TPaError; cdecl; external LibName;
+
+
+{** Library termination function - call this when finished using PortAudio.
+ This function deallocates all resources allocated by PortAudio since it was
+ initializied by a call to Pa_Initialize(). In cases where Pa_Initialise() has
+ been called multiple times, each call must be matched with a corresponding call
+ to Pa_Terminate(). The final matching call to Pa_Terminate() will automatically
+ close any PortAudio streams that are still open.
+
+ Pa_Terminate() MUST be called before exiting a program which uses PortAudio.
+ Failure to do so may result in serious resource leaks, such as audio devices
+ not being available until the next reboot.
+
+ @return paNoError if successful, otherwise an error code indicating the cause
+ of failure.
+
+ @see Pa_Initialize
+*}
+function Pa_Terminate(): TPaError; cdecl; external LibName;
+
+
+
+{** The type used to refer to audio devices. Values of this type usually
+ range from 0 to (Pa_GetDeviceCount()-1), and may also take on the PaNoDevice
+ and paUseHostApiSpecificDeviceSpecification values.
+
+ @see Pa_GetDeviceCount, paNoDevice, paUseHostApiSpecificDeviceSpecification
+*}
+type TPaDeviceIndex = Integer;
+
+
+{** A special PaDeviceIndex value indicating that no device is available,
+ or should be used.
+
+ @see PaDeviceIndex
+*}
+const paNoDevice = TPaDeviceIndex(-1);
+
+
+{** A special PaDeviceIndex value indicating that the device(s) to be used
+ are specified in the host api specific stream info structure.
+
+ @see PaDeviceIndex
+*}
+const paUseHostApiSpecificDeviceSpecification = TPaDeviceIndex(-2);
+
+
+{* Host API enumeration mechanism *}
+
+{** The type used to enumerate to host APIs at runtime. Values of this type
+ range from 0 to (Pa_GetHostApiCount()-1).
+
+ @see Pa_GetHostApiCount
+*}
+type TPaHostApiIndex = Integer;
+
+{** Retrieve the number of available host APIs. Even if a host API is
+ available it may have no devices available.
+
+ @return A non-negative value indicating the number of available host APIs
+ or, a PaErrorCode (which are always negative) if PortAudio is not initialized
+ or an error is encountered.
+
+ @see PaHostApiIndex
+*}
+function Pa_GetHostApiCount(): TPaHostApiIndex; cdecl; external LibName;
+
+
+{** Retrieve the index of the default host API. The default host API will be
+ the lowest common denominator host API on the current platform and is
+ unlikely to provide the best performance.
+
+ @return A non-negative value ranging from 0 to (Pa_GetHostApiCount()-1)
+ indicating the default host API index or, a PaErrorCode (which are always
+ negative) if PortAudio is not initialized or an error is encountered.
+*}
+function Pa_GetDefaultHostApi(): TPaHostApiIndex; cdecl; external LibName;
+
+
+{** Unchanging unique identifiers for each supported host API. This type
+ is used in the PaHostApiInfo structure. The values are guaranteed to be
+ unique and to never change, thus allowing code to be written that
+ conditionally uses host API specific extensions.
+
+ New type ids will be allocated when support for a host API reaches
+ "public alpha" status, prior to that developers should use the
+ paInDevelopment type id.
+
+ @see PaHostApiInfo
+*}
+type TPaHostApiTypeId = {enum}Integer; const
+{enum_begin PaHostApiTypeId}
+ paInDevelopment=0; {* use while developing support for a new host API *}
+ paDirectSound=1;
+ paMME=2;
+ paASIO=3;
+ paSoundManager=4;
+ paCoreAudio=5;
+ paOSS=7;
+ paALSA=8;
+ paAL=9;
+ paBeOS=10;
+ paWDMKS=11;
+ paJACK=12;
+ paWASAPI=13;
+ paAudioScienceHPI=14;
+{enum_end PaHostApiTypeId}
+
+{** A structure containing information about a particular host API. *}
+
+type
+ PPaHostApiInfo = ^TPaHostApiInfo;
+ TPaHostApiInfo = record
+ {** this is struct version 1 *}
+ structVersion: Integer;
+ {** The well known unique identifier of this host API @see PaHostApiTypeId *}
+ _type: TPaHostApiTypeId;
+ {** A textual description of the host API for display on user interfaces. *}
+ name: PChar;
+
+ {** The number of devices belonging to this host API. This field may be
+ used in conjunction with Pa_HostApiDeviceIndexToDeviceIndex() to enumerate
+ all devices for this host API.
+ @see Pa_HostApiDeviceIndexToDeviceIndex
+ *}
+ deviceCount: Integer;
+
+ {** The default input device for this host API. The value will be a
+ device index ranging from 0 to (Pa_GetDeviceCount()-1), or paNoDevice
+ if no default input device is available.
+ *}
+ defaultInputDevice: TPaDeviceIndex;
+
+ {** The default output device for this host API. The value will be a
+ device index ranging from 0 to (Pa_GetDeviceCount()-1), or paNoDevice
+ if no default output device is available.
+ *}
+ defaultOutputDevice: TPaDeviceIndex;
+ end;
+
+
+{** Retrieve a pointer to a structure containing information about a specific
+ host Api.
+
+ @param hostApi A valid host API index ranging from 0 to (Pa_GetHostApiCount()-1)
+
+ @return A pointer to an immutable PaHostApiInfo structure describing
+ a specific host API. If the hostApi parameter is out of range or an error
+ is encountered, the function returns NULL.
+
+ The returned structure is owned by the PortAudio implementation and must not
+ be manipulated or freed. The pointer is only guaranteed to be valid between
+ calls to Pa_Initialize() and Pa_Terminate().
+*}
+function Pa_GetHostApiInfo( hostApi: TPaHostApiIndex ): PPaHostApiInfo; cdecl; external LibName;
+
+
+{** Convert a static host API unique identifier, into a runtime
+ host API index.
+
+ @param type A unique host API identifier belonging to the PaHostApiTypeId
+ enumeration.
+
+ @return A valid PaHostApiIndex ranging from 0 to (Pa_GetHostApiCount()-1) or,
+ a PaErrorCode (which are always negative) if PortAudio is not initialized
+ or an error is encountered.
+
+ The paHostApiNotFound error code indicates that the host API specified by the
+ type parameter is not available.
+
+ @see PaHostApiTypeId
+*}
+function Pa_HostApiTypeIdToHostApiIndex( _type: TPaHostApiTypeId ): TPaHostApiIndex; cdecl; external LibName;
+
+
+{** Convert a host-API-specific device index to standard PortAudio device index.
+ This function may be used in conjunction with the deviceCount field of
+ PaHostApiInfo to enumerate all devices for the specified host API.
+
+ @param hostApi A valid host API index ranging from 0 to (Pa_GetHostApiCount()-1)
+
+ @param hostApiDeviceIndex A valid per-host device index in the range
+ 0 to (Pa_GetHostApiInfo(hostApi)->deviceCount-1)
+
+ @return A non-negative PaDeviceIndex ranging from 0 to (Pa_GetDeviceCount()-1)
+ or, a PaErrorCode (which are always negative) if PortAudio is not initialized
+ or an error is encountered.
+
+ A paInvalidHostApi error code indicates that the host API index specified by
+ the hostApi parameter is out of range.
+
+ A paInvalidDevice error code indicates that the hostApiDeviceIndex parameter
+ is out of range.
+
+ @see PaHostApiInfo
+*}
+function Pa_HostApiDeviceIndexToDeviceIndex( hostApi: TPaHostApiIndex;
+ hostApiDeviceIndex: Integer ): TPaDeviceIndex; cdecl; external LibName;
+
+
+
+{** Structure used to return information about a host error condition.
+*}
+type
+ PPaHostErrorInfo = ^TPaHostErrorInfo;
+ TPaHostErrorInfo = record
+ hostApiType: TPaHostApiTypeId; {**< the host API which returned the error code *}
+ errorCode: Longint; {**< the error code returned *}
+ errorText: PChar; {**< a textual description of the error if available, otherwise a zero-length string *}
+ end;
+
+
+{** Return information about the last host error encountered. The error
+ information returned by Pa_GetLastHostErrorInfo() will never be modified
+ asyncronously by errors occurring in other PortAudio owned threads
+ (such as the thread that manages the stream callback.)
+
+ This function is provided as a last resort, primarily to enhance debugging
+ by providing clients with access to all available error information.
+
+ @return A pointer to an immutable structure constaining information about
+ the host error. The values in this structure will only be valid if a
+ PortAudio function has previously returned the paUnanticipatedHostError
+ error code.
+*}
+function Pa_GetLastHostErrorInfo(): PPaHostErrorInfo; cdecl; external LibName;
+
+
+
+{* Device enumeration and capabilities *}
+
+{** Retrieve the number of available devices. The number of available devices
+ may be zero.
+
+ @return A non-negative value indicating the number of available devices or,
+ a PaErrorCode (which are always negative) if PortAudio is not initialized
+ or an error is encountered.
+*}
+function Pa_GetDeviceCount(): TPaDeviceIndex; cdecl; external LibName;
+
+
+{** Retrieve the index of the default input device. The result can be
+ used in the inputDevice parameter to Pa_OpenStream().
+
+ @return The default input device index for the default host API, or paNoDevice
+ if no default input device is available or an error was encountered.
+*}
+function Pa_GetDefaultInputDevice(): TPaDeviceIndex; cdecl; external LibName;
+
+
+{** Retrieve the index of the default output device. The result can be
+ used in the outputDevice parameter to Pa_OpenStream().
+
+ @return The default output device index for the defualt host API, or paNoDevice
+ if no default output device is available or an error was encountered.
+
+ @note
+ On the PC, the user can specify a default device by
+ setting an environment variable. For example, to use device #1.
+<pre>
+ set PA_RECOMMENDED_OUTPUT_DEVICE=1
+</pre>
+ The user should first determine the available device ids by using
+ the supplied application "pa_devs".
+*}
+function Pa_GetDefaultOutputDevice(): TPaDeviceIndex; cdecl; external LibName;
+
+
+{** The type used to represent monotonic time in seconds that can be used
+ for syncronisation. The type is used for the outTime argument to the
+ PaStreamCallback and as the result of Pa_GetStreamTime().
+
+ @see PaStreamCallback, Pa_GetStreamTime
+*}
+type TPaTime = Double;
+
+
+{** A type used to specify one or more sample formats. Each value indicates
+ a possible format for sound data passed to and from the stream callback,
+ Pa_ReadStream and Pa_WriteStream.
+
+ The standard formats paFloat32, paInt16, paInt32, paInt24, paInt8
+ and aUInt8 are usually implemented by all implementations.
+
+ The floating point representation (paFloat32) uses +1.0 and -1.0 as the
+ maximum and minimum respectively.
+
+ paUInt8 is an unsigned 8 bit format where 128 is considered "ground"
+
+ The paNonInterleaved flag indicates that a multichannel buffer is passed
+ as a set of non-interleaved pointers.
+
+ @see Pa_OpenStream, Pa_OpenDefaultStream, PaDeviceInfo
+ @see paFloat32, paInt16, paInt32, paInt24, paInt8
+ @see paUInt8, paCustomFormat, paNonInterleaved
+*}
+type TPaSampleFormat = Longword;
+const
+ paFloat32 = TPaSampleFormat($00000001); {**< @see PaSampleFormat *}
+ paInt32 = TPaSampleFormat($00000002); {**< @see PaSampleFormat *}
+ paInt24 = TPaSampleFormat($00000004); {**< Packed 24 bit format. @see PaSampleFormat *}
+ paInt16 = TPaSampleFormat($00000008); {**< @see PaSampleFormat *}
+ paInt8 = TPaSampleFormat($00000010); {**< @see PaSampleFormat *}
+ paUInt8 = TPaSampleFormat($00000020); {**< @see PaSampleFormat *}
+ paCustomFormat = TPaSampleFormat($00010000); {**< @see PaSampleFormat *}
+ paNonInterleaved = TPaSampleFormat($80000000);
+
+{** A structure providing information and capabilities of PortAudio devices.
+ Devices may support input, output or both input and output.
+*}
+type
+ PPaDeviceInfo = ^TPaDeviceInfo;
+ TPaDeviceInfo = record
+ structVersion: Integer; {* this is struct version 2 *}
+ name: PChar;
+ hostApi: TPaHostApiIndex; {* note this is a host API index, not a type id*}
+
+ maxInputChannels: Integer;
+ maxOutputChannels: Integer;
+
+ {* Default latency values for interactive performance. *}
+ defaultLowInputLatency: TPaTime;
+ defaultLowOutputLatency: TPaTime;
+ {* Default latency values for robust non-interactive applications (eg. playing sound files). *}
+ defaultHighInputLatency: TPaTime;
+ defaultHighOutputLatency: TPaTime;
+
+ defaultSampleRate: Double;
+ end;
+
+
+{** Retrieve a pointer to a PaDeviceInfo structure containing information
+ about the specified device.
+ @return A pointer to an immutable PaDeviceInfo structure. If the device
+ parameter is out of range the function returns NULL.
+
+ @param device A valid device index in the range 0 to (Pa_GetDeviceCount()-1)
+
+ @note PortAudio manages the memory referenced by the returned pointer,
+ the client must not manipulate or free the memory. The pointer is only
+ guaranteed to be valid between calls to Pa_Initialize() and Pa_Terminate().
+
+ @see PaDeviceInfo, PaDeviceIndex
+*}
+function Pa_GetDeviceInfo( device: TPaDeviceIndex ): PPaDeviceInfo; cdecl; external LibName;
+
+
+{** Parameters for one direction (input or output) of a stream.
+*}
+type
+ PPaStreamParameters = ^TPaStreamParameters;
+ TPaStreamParameters = record
+ {** A valid device index in the range 0 to (Pa_GetDeviceCount()-1)
+ specifying the device to be used or the special constant
+ paUseHostApiSpecificDeviceSpecification which indicates that the actual
+ device(s) to use are specified in hostApiSpecificStreamInfo.
+ This field must not be set to paNoDevice.
+ *}
+ device: TPaDeviceIndex;
+
+ {** The number of channels of sound to be delivered to the
+ stream callback or accessed by Pa_ReadStream() or Pa_WriteStream().
+ It can range from 1 to the value of maxInputChannels in the
+ PaDeviceInfo record for the device specified by the device parameter.
+ *}
+ channelCount: Integer;
+
+ {** The sample format of the buffer provided to the stream callback,
+ a_ReadStream() or Pa_WriteStream(). It may be any of the formats described
+ by the PaSampleFormat enumeration.
+ *}
+ sampleFormat: TPaSampleFormat;
+
+ {** The desired latency in seconds. Where practical, implementations should
+ configure their latency based on these parameters, otherwise they may
+ choose the closest viable latency instead. Unless the suggested latency
+ is greater than the absolute upper limit for the device implementations
+ should round the suggestedLatency up to the next practial value - ie to
+ provide an equal or higher latency than suggestedLatency wherever possibe.
+ Actual latency values for an open stream may be retrieved using the
+ inputLatency and outputLatency fields of the PaStreamInfo structure
+ returned by Pa_GetStreamInfo().
+ @see default*Latency in PaDeviceInfo, *Latency in PaStreamInfo
+ *}
+ suggestedLatency: TPaTime;
+
+ {** An optional pointer to a host api specific data structure
+ containing additional information for device setup and/or stream processing.
+ hostApiSpecificStreamInfo is never required for correct operation,
+ if not used it should be set to NULL.
+ *}
+ hostApiSpecificStreamInfo: Pointer;
+ end;
+
+
+{** Return code for Pa_IsFormatSupported indicating success. *}
+const paFormatIsSupported = (0);
+
+{** Determine whether it would be possible to open a stream with the specified
+ parameters.
+
+ @param inputParameters A structure that describes the input parameters used to
+ open a stream. The suggestedLatency field is ignored. See PaStreamParameters
+ for a description of these parameters. inputParameters must be NULL for
+ output-only streams.
+
+ @param outputParameters A structure that describes the output parameters used
+ to open a stream. The suggestedLatency field is ignored. See PaStreamParameters
+ for a description of these parameters. outputParameters must be NULL for
+ input-only streams.
+
+ @param sampleRate The required sampleRate. For full-duplex streams it is the
+ sample rate for both input and output
+
+ @return Returns 0 if the format is supported, and an error code indicating why
+ the format is not supported otherwise. The constant paFormatIsSupported is
+ provided to compare with the return value for success.
+
+ @see paFormatIsSupported, PaStreamParameters
+*}
+function Pa_IsFormatSupported( inputParameters: PPaStreamParameters;
+ outputParameters: PPaStreamParameters;
+ sampleRate: Double ): TPaError; cdecl; external LibName;
+
+
+
+{* Streaming types and functions *}
+
+
+{**
+ A single PaStream can provide multiple channels of real-time
+ streaming audio input and output to a client application. A stream
+ provides access to audio hardware represented by one or more
+ PaDevices. Depending on the underlying Host API, it may be possible
+ to open multiple streams using the same device, however this behavior
+ is implementation defined. Portable applications should assume that
+ a PaDevice may be simultaneously used by at most one PaStream.
+
+ Pointers to PaStream objects are passed between PortAudio functions that
+ operate on streams.
+
+ @see Pa_OpenStream, Pa_OpenDefaultStream, Pa_OpenDefaultStream, Pa_CloseStream,
+ Pa_StartStream, Pa_StopStream, Pa_AbortStream, Pa_IsStreamActive,
+ Pa_GetStreamTime, Pa_GetStreamCpuLoad
+
+*}
+type
+ PPaStream = Pointer;
+
+{** Can be passed as the framesPerBuffer parameter to Pa_OpenStream()
+ or Pa_OpenDefaultStream() to indicate that the stream callback will
+ accept buffers of any size.
+*}
+const paFramesPerBufferUnspecified = (0);
+
+
+{** Flags used to control the behavior of a stream. They are passed as
+ parameters to Pa_OpenStream or Pa_OpenDefaultStream. Multiple flags may be
+ ORed together.
+
+ @see Pa_OpenStream, Pa_OpenDefaultStream
+ @see paNoFlag, paClipOff, paDitherOff, paNeverDropInput,
+ paPrimeOutputBuffersUsingStreamCallback, paPlatformSpecificFlags
+*}
+type TPaStreamFlags = Longword;
+
+{** @see PaStreamFlags *}
+const paNoFlag = TPaStreamFlags(0);
+
+{** Disable default clipping of out of range samples.
+ @see PaStreamFlags
+*}
+const paClipOff = TPaStreamFlags($00000001);
+
+{** Disable default dithering.
+ @see PaStreamFlags
+*}
+const paDitherOff = TPaStreamFlags($00000002);
+
+{** Flag requests that where possible a full duplex stream will not discard
+ overflowed input samples without calling the stream callback. This flag is
+ only valid for full duplex callback streams and only when used in combination
+ with the paFramesPerBufferUnspecified (0) framesPerBuffer parameter. Using
+ this flag incorrectly results in a paInvalidFlag error being returned from
+ Pa_OpenStream and Pa_OpenDefaultStream.
+
+ @see PaStreamFlags, paFramesPerBufferUnspecified
+*}
+const paNeverDropInput = TPaStreamFlags($00000004);
+
+{** Call the stream callback to fill initial output buffers, rather than the
+ default behavior of priming the buffers with zeros (silence). This flag has
+ no effect for input-only and blocking read/write streams.
+
+ @see PaStreamFlags
+*}
+const paPrimeOutputBuffersUsingStreamCallback = TPaStreamFlags($00000008);
+
+{** A mask specifying the platform specific bits.
+ @see PaStreamFlags
+*}
+const paPlatformSpecificFlags = TPaStreamFlags($FFFF0000);
+
+{**
+ Timing information for the buffers passed to the stream callback.
+*}
+type
+ PPaStreamCallbackTimeInfo = ^TPaStreamCallbackTimeInfo;
+ TPaStreamCallbackTimeInfo = record
+ inputBufferAdcTime: TPaTime;
+ currentTime: TPaTime;
+ outputBufferDacTime: TPaTime;
+ end;
+
+
+{**
+ Flag bit constants for the statusFlags to PaStreamCallback.
+
+ @see paInputUnderflow, paInputOverflow, paOutputUnderflow, paOutputOverflow,
+ paPrimingOutput
+*}
+type TPaStreamCallbackFlags = Longword;
+
+{** In a stream opened with paFramesPerBufferUnspecified, indicates that
+ input data is all silence (zeros) because no real data is available. In a
+ stream opened without paFramesPerBufferUnspecified, it indicates that one or
+ more zero samples have been inserted into the input buffer to compensate
+ for an input underflow.
+ @see PaStreamCallbackFlags
+*}
+const paInputUnderflow = TPaStreamCallbackFlags($00000001);
+
+{** In a stream opened with paFramesPerBufferUnspecified, indicates that data
+ prior to the first sample of the input buffer was discarded due to an
+ overflow, possibly because the stream callback is using too much CPU time.
+ Otherwise indicates that data prior to one or more samples in the
+ input buffer was discarded.
+ @see PaStreamCallbackFlags
+*}
+const paInputOverflow = TPaStreamCallbackFlags($00000002);
+
+{** Indicates that output data (or a gap) was inserted, possibly because the
+ stream callback is using too much CPU time.
+ @see PaStreamCallbackFlags
+*}
+const paOutputUnderflow = TPaStreamCallbackFlags($00000004);
+
+{** Indicates that output data will be discarded because no room is available.
+ @see PaStreamCallbackFlags
+*}
+const paOutputOverflow = TPaStreamCallbackFlags($00000008);
+
+{** Some of all of the output data will be used to prime the stream, input
+ data may be zero.
+ @see PaStreamCallbackFlags
+*}
+const paPrimingOutput = TPaStreamCallbackFlags($00000010);
+
+{**
+ Allowable return values for the PaStreamCallback.
+ @see PaStreamCallback
+*}
+type TPaStreamCallbackResult = {enum}Integer; const
+{enum_begin PaStreamCallbackResult}
+ paContinue=0;
+ paComplete=1;
+ paAbort=2;
+{enum_end PaStreamCallbackResult}
+
+{**
+ Functions of type PaStreamCallback are implemented by PortAudio clients.
+ They consume, process or generate audio in response to requests from an
+ active PortAudio stream.
+
+ @param input and @param output are arrays of interleaved samples,
+ the format, packing and number of channels used by the buffers are
+ determined by parameters to Pa_OpenStream().
+
+ @param frameCount The number of sample frames to be processed by
+ the stream callback.
+
+ @param timeInfo The time in seconds when the first sample of the input
+ buffer was received at the audio input, the time in seconds when the first
+ sample of the output buffer will begin being played at the audio output, and
+ the time in seconds when the stream callback was called.
+ See also Pa_GetStreamTime()
+
+ @param statusFlags Flags indicating whether input and/or output buffers
+ have been inserted or will be dropped to overcome underflow or overflow
+ conditions.
+
+ @param userData The value of a user supplied pointer passed to
+ Pa_OpenStream() intended for storing synthesis data etc.
+
+ @return
+ The stream callback should return one of the values in the
+ PaStreamCallbackResult enumeration. To ensure that the callback continues
+ to be called, it should return paContinue (0). Either paComplete or paAbort
+ can be returned to finish stream processing, after either of these values is
+ returned the callback will not be called again. If paAbort is returned the
+ stream will finish as soon as possible. If paComplete is returned, the stream
+ will continue until all buffers generated by the callback have been played.
+ 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 Pa_StopStream(), Pa_AbortStream() or Pa_CloseStream() can also
+ be used to stop the stream. The callback must always fill the entire output
+ buffer irrespective of its return value.
+
+ @see Pa_OpenStream, Pa_OpenDefaultStream
+
+ @note With the exception of Pa_GetStreamCpuLoad() it is not permissable to call
+ PortAudio API functions from within the stream callback.
+*}
+type
+ PPaStreamCallback = ^TPaStreamCallback;
+ TPaStreamCallback = function(
+ input: Pointer; output: Pointer;
+ frameCount: Longword;
+ timeInfo: PPaStreamCallbackTimeInfo;
+ statusFlags: TPaStreamCallbackFlags;
+ userData: Pointer ): Integer; cdecl;
+
+
+{** Opens a stream for either input, output or both.
+
+ @param stream The address of a PaStream pointer which will receive
+ a pointer to the newly opened stream.
+
+ @param inputParameters A structure that describes the input parameters used by
+ the opened stream. See PaStreamParameters for a description of these parameters.
+ inputParameters must be NULL for output-only streams.
+
+ @param outputParameters A structure that describes the output parameters used by
+ the opened stream. See PaStreamParameters for a description of these parameters.
+ outputParameters must be NULL for input-only streams.
+
+ @param sampleRate The desired sampleRate. For full-duplex streams it is the
+ sample rate for both input and output
+
+ @param framesPerBuffer The number of frames passed to the stream callback
+ function, or the preferred block granularity for a blocking read/write stream.
+ The special value paFramesPerBufferUnspecified (0) may be used to request that
+ the stream callback will recieve an optimal (and possibly varying) number of
+ frames based on host requirements and the requested latency settings.
+ Note: With some host APIs, the use of non-zero framesPerBuffer for a callback
+ stream may introduce an additional layer of buffering which could introduce
+ additional latency. PortAudio guarantees that the additional latency
+ will be kept to the theoretical minimum however, it is strongly recommended
+ that a non-zero framesPerBuffer value only be used when your algorithm
+ requires a fixed number of frames per stream callback.
+
+ @param streamFlags Flags which modify the behaviour of the streaming process.
+ This parameter may contain a combination of flags ORed together. Some flags may
+ only be relevant to certain buffer formats.
+
+ @param streamCallback A pointer to a client supplied function that is responsible
+ for processing and filling input and output buffers. If this parameter is NULL
+ the stream will be opened in 'blocking read/write' mode. In blocking mode,
+ the client can receive sample data using Pa_ReadStream and write sample data
+ using Pa_WriteStream, the number of samples that may be read or written
+ without blocking is returned by Pa_GetStreamReadAvailable and
+ Pa_GetStreamWriteAvailable respectively.
+
+ @param userData A client supplied pointer which is passed to the stream callback
+ function. It could for example, contain a pointer to instance data necessary
+ for processing the audio buffers. This parameter is ignored if streamCallback
+ is NULL.
+
+ @return
+ Upon success Pa_OpenStream() returns paNoError and places a pointer to a
+ valid PaStream in the stream argument. The stream is inactive (stopped).
+ If a call to Pa_OpenStream() fails, a non-zero error code is returned (see
+ PaError for possible error codes) and the value of stream is invalid.
+
+ @see PaStreamParameters, PaStreamCallback, Pa_ReadStream, Pa_WriteStream,
+ Pa_GetStreamReadAvailable, Pa_GetStreamWriteAvailable
+*}
+function Pa_OpenStream( var stream: PPaStream;
+ inputParameters: PPaStreamParameters;
+ outputParameters: PPaStreamParameters;
+ sampleRate: Double;
+ framesPerBuffer: Longword;
+ streamFlags: TPaStreamFlags;
+ streamCallback: PPaStreamCallback;
+ userData: Pointer ): TPaError; cdecl; external LibName;
+
+
+{** A simplified version of Pa_OpenStream() that opens the default input
+ and/or output devices.
+
+ @param stream The address of a PaStream pointer which will receive
+ a pointer to the newly opened stream.
+
+ @param numInputChannels The number of channels of sound that will be supplied
+ to the stream callback or returned by Pa_ReadStream. It can range from 1 to
+ the value of maxInputChannels in the PaDeviceInfo record for the default input
+ device. If 0 the stream is opened as an output-only stream.
+
+ @param numOutputChannels The number of channels of sound to be delivered to the
+ stream callback or passed to Pa_WriteStream. It can range from 1 to the value
+ of maxOutputChannels in the PaDeviceInfo record for the default output dvice.
+ If 0 the stream is opened as an output-only stream.
+
+ @param sampleFormat The sample format of both the input and output buffers
+ provided to the callback or passed to and from Pa_ReadStream and Pa_WriteStream.
+ sampleFormat may be any of the formats described by the PaSampleFormat
+ enumeration.
+
+ @param sampleRate Same as Pa_OpenStream parameter of the same name.
+ @param framesPerBuffer Same as Pa_OpenStream parameter of the same name.
+ @param streamCallback Same as Pa_OpenStream parameter of the same name.
+ @param userData Same as Pa_OpenStream parameter of the same name.
+
+ @return As for Pa_OpenStream
+
+ @see Pa_OpenStream, PaStreamCallback
+*}
+function Pa_OpenDefaultStream( var stream: PPaStream;
+ numInputChannels: Integer;
+ numOutputChannels: Integer;
+ sampleFormat: TPaSampleFormat;
+ sampleRate: Double;
+ framesPerBuffer: Longword;
+ streamCallback: PPaStreamCallback;
+ userData: Pointer ): TPaError; cdecl; external LibName;
+
+
+{** Closes an audio stream. If the audio stream is active it
+ discards any pending buffers as if Pa_AbortStream() had been called.
+*}
+function Pa_CloseStream( stream: PPaStream ): TPaError; cdecl; external LibName;
+
+
+{** Functions of type PaStreamFinishedCallback are implemented by PortAudio
+ clients. They can be registered with a stream using the Pa_SetStreamFinishedCallback
+ function. Once registered they are called when the stream becomes inactive
+ (ie once a call to Pa_StopStream() will not block).
+ A stream will become inactive after the stream callback returns non-zero,
+ or when Pa_StopStream or Pa_AbortStream is called. For a stream providing audio
+ output, if the stream callback returns paComplete, or Pa_StopStream is called,
+ the stream finished callback will not be called until all generated sample data
+ has been played.
+
+ @param userData The userData parameter supplied to Pa_OpenStream()
+
+ @see Pa_SetStreamFinishedCallback
+*}
+type
+ PPaStreamFinishedCallback = ^TPaStreamFinishedCallback;
+ TPaStreamFinishedCallback = procedure( userData: Pointer ); cdecl;
+
+
+{** Register a stream finished callback function which will be called when the
+ stream becomes inactive. See the description of PaStreamFinishedCallback for
+ further details about when the callback will be called.
+
+ @param stream a pointer to a PaStream that is in the stopped state - if the
+ stream is not stopped, the stream's finished callback will remain unchanged
+ and an error code will be returned.
+
+ @param streamFinishedCallback a pointer to a function with the same signature
+ as PaStreamFinishedCallback, that will be called when the stream becomes
+ inactive. Passing NULL for this parameter will un-register a previously
+ registered stream finished callback function.
+
+ @return on success returns paNoError, otherwise an error code indicating the cause
+ of the error.
+
+ @see PaStreamFinishedCallback
+*}
+function Pa_SetStreamFinishedCallback( stream: PPaStream;
+ streamFinishedCallback: PPaStreamFinishedCallback ): TPaError; cdecl; external LibName;
+
+
+{** Commences audio processing.
+*}
+function Pa_StartStream( stream: PPaStream ): TPaError; cdecl; external LibName;
+
+
+{** Terminates audio processing. It waits until all pending
+ audio buffers have been played before it returns.
+*}
+function Pa_StopStream( stream: PPaStream ): TPaError; cdecl; external LibName;
+
+
+{** Terminates audio processing immediately without waiting for pending
+ buffers to complete.
+*}
+function Pa_AbortStream( stream: PPaStream ): TPaError; cdecl; external LibName;
+
+
+{** Determine whether the stream is stopped.
+ A stream is considered to be stopped prior to a successful call to
+ Pa_StartStream and after a successful call to Pa_StopStream or Pa_AbortStream.
+ If a stream callback returns a value other than paContinue the stream is NOT
+ considered to be stopped.
+
+ @return Returns one (1) when the stream is stopped, zero (0) when
+ the stream is running or, a PaErrorCode (which are always negative) if
+ PortAudio is not initialized or an error is encountered.
+
+ @see Pa_StopStream, Pa_AbortStream, Pa_IsStreamActive
+*}
+function Pa_IsStreamStopped( stream: PPaStream ): TPaError; cdecl; external LibName;
+
+
+{** Determine whether the stream is active.
+ A stream is active after a successful call to Pa_StartStream(), until it
+ becomes inactive either as a result of a call to Pa_StopStream() or
+ Pa_AbortStream(), or as a result of a return value other than paContinue from
+ the stream callback. In the latter case, the stream is considered inactive
+ after the last buffer has finished playing.
+
+ @return Returns one (1) when the stream is active (ie playing or recording
+ audio), zero (0) when not playing or, a PaErrorCode (which are always negative)
+ if PortAudio is not initialized or an error is encountered.
+
+ @see Pa_StopStream, Pa_AbortStream, Pa_IsStreamStopped
+*}
+function Pa_IsStreamActive( stream: PPaStream ): TPaError; cdecl; external LibName;
+
+
+
+{** A structure containing unchanging information about an open stream.
+ @see Pa_GetStreamInfo
+*}
+type
+ PPaStreamInfo = ^TPaStreamInfo;
+ TPaStreamInfo = record
+ {** this is struct version 1 *}
+ structVersion: Integer;
+
+ {** The input latency of the stream in seconds. This value provides the most
+ accurate estimate of input latency available to the implementation. It may
+ differ significantly from the suggestedLatency value passed to Pa_OpenStream().
+ The value of this field will be zero (0.) for output-only streams.
+ @see PaTime
+ *}
+ inputLatency: TPaTime;
+
+ {** The output latency of the stream in seconds. This value provides the most
+ accurate estimate of output latency available to the implementation. It may
+ differ significantly from the suggestedLatency value passed to Pa_OpenStream().
+ The value of this field will be zero (0.) for input-only streams.
+ @see PaTime
+ *}
+ outputLatency: TPaTime;
+
+ {** The sample rate of the stream in Hertz (samples per second). In cases
+ where the hardware sample rate is inaccurate and PortAudio is aware of it,
+ the value of this field may be different from the sampleRate parameter
+ passed to Pa_OpenStream(). If information about the actual hardware sample
+ rate is not available, this field will have the same value as the sampleRate
+ parameter passed to Pa_OpenStream().
+ *}
+ sampleRate: Double;
+ end;
+
+
+{** Retrieve a pointer to a PaStreamInfo structure containing information
+ about the specified stream.
+ @return A pointer to an immutable PaStreamInfo structure. If the stream
+ parameter invalid, or an error is encountered, the function returns NULL.
+
+ @param stream A pointer to an open stream previously created with Pa_OpenStream.
+
+ @note PortAudio manages the memory referenced by the returned pointer,
+ the client must not manipulate or free the memory. The pointer is only
+ guaranteed to be valid until the specified stream is closed.
+
+ @see PaStreamInfo
+*}
+function Pa_GetStreamInfo( stream: PPaStream ): PPaStreamInfo; cdecl; external LibName;
+
+
+{** Determine the current time for the stream according to the same clock used
+ to generate buffer timestamps. This time may be used for syncronising other
+ events to the audio stream, for example synchronizing audio to MIDI.
+
+ @return The stream's current time in seconds, or 0 if an error occurred.
+
+ @see PaTime, PaStreamCallback
+*}
+function Pa_GetStreamTime( stream: PPaStream ): TPaTime; cdecl; external LibName;
+
+
+{** Retrieve CPU usage information for the specified stream.
+ The "CPU Load" is a fraction of total CPU time consumed by a callback stream's
+ audio processing routines including, but not limited to the client supplied
+ stream callback. This function does not work with blocking read/write streams.
+
+ This function may be called from the stream callback function or the
+ application.
+
+ @return
+ A floating point value, typically between 0.0 and 1.0, where 1.0 indicates
+ that the stream callback is consuming the maximum number of CPU cycles possible
+ to maintain real-time operation. A value of 0.5 would imply that PortAudio and
+ the stream callback was consuming roughly 50% of the available CPU time. The
+ return value may exceed 1.0. A value of 0.0 will always be returned for a
+ blocking read/write stream, or if an error occurrs.
+*}
+function Pa_GetStreamCpuLoad( stream: PPaStream ): Double; cdecl; external LibName;
+
+
+{** Read samples from an input stream. The function doesn't return until
+ the entire buffer has been filled - this may involve waiting for the operating
+ system to supply the data.
+
+ @param stream A pointer to an open stream previously created with Pa_OpenStream.
+
+ @param buffer A pointer to a buffer of sample frames. The buffer contains
+ samples in the format specified by the inputParameters->sampleFormat field
+ used to open the stream, and the number of channels specified by
+ inputParameters->numChannels. If non-interleaved samples were requested,
+ buffer is a pointer to the first element of an array of non-interleaved
+ buffer pointers, one for each channel.
+
+ @param frames The number of frames to be read into buffer. This parameter
+ is not constrained to a specific range, however high performance applications
+ will want to match this parameter to the framesPerBuffer parameter used
+ when opening the stream.
+
+ @return On success PaNoError will be returned, or PaInputOverflowed if input
+ data was discarded by PortAudio after the previous call and before this call.
+*}
+function Pa_ReadStream( stream: PPaStream;
+ buffer: Pointer;
+ frames: Longword ): TPaError; cdecl; external LibName;
+
+
+{** Write samples to an output stream. This function doesn't return until the
+ entire buffer has been consumed - this may involve waiting for the operating
+ system to consume the data.
+
+ @param stream A pointer to an open stream previously created with Pa_OpenStream.
+
+ @param buffer A pointer to a buffer of sample frames. The buffer contains
+ samples in the format specified by the outputParameters->sampleFormat field
+ used to open the stream, and the number of channels specified by
+ outputParameters->numChannels. If non-interleaved samples were requested,
+ buffer is a pointer to the first element of an array of non-interleaved
+ buffer pointers, one for each channel.
+
+ @param frames The number of frames to be written from buffer. This parameter
+ is not constrained to a specific range, however high performance applications
+ will want to match this parameter to the framesPerBuffer parameter used
+ when opening the stream.
+
+ @return On success PaNoError will be returned, or paOutputUnderflowed if
+ additional output data was inserted after the previous call and before this
+ call.
+*}
+function Pa_WriteStream( stream: PPaStream;
+ buffer: Pointer;
+ frames: Longword ): TPaError; cdecl; external LibName;
+
+
+{** Retrieve the number of frames that can be read from the stream without
+ waiting.
+
+ @return Returns a non-negative value representing the maximum number of frames
+ that can be read from the stream without blocking or busy waiting or, a
+ PaErrorCode (which are always negative) if PortAudio is not initialized or an
+ error is encountered.
+*}
+function Pa_GetStreamReadAvailable( stream: PPaStream ): Longint; cdecl; external LibName;
+
+
+{** Retrieve the number of frames that can be written to the stream without
+ waiting.
+
+ @return Returns a non-negative value representing the maximum number of frames
+ that can be written to the stream without blocking or busy waiting or, a
+ PaErrorCode (which are always negative) if PortAudio is not initialized or an
+ error is encountered.
+*}
+function Pa_GetStreamWriteAvailable( stream: PPaStream ): Longint; cdecl; external LibName;
+
+
+{** Retrieve the host type handling an open stream.
+
+ @return Returns a non-negative value representing the host API type
+ handling an open stream or, a PaErrorCode (which are always negative)
+ if PortAudio is not initialized or an error is encountered.
+*}
+function Pa_GetStreamHostApiType( stream: PPaStream ): TPaHostApiTypeId; cdecl; external LibName;
+
+
+{* Miscellaneous utilities *}
+
+
+{** Retrieve the size of a given sample format in bytes.
+
+ @return The size in bytes of a single sample in the specified format,
+ or paSampleFormatNotSupported if the format is not supported.
+*}
+function Pa_GetSampleSize( format: TPaSampleFormat ): TPaError; cdecl; external LibName;
+
+
+{** Put the caller to sleep for at least 'msec' milliseconds. This function is
+ provided only as a convenience for authors of portable code (such as the tests
+ and examples in the PortAudio distribution.)
+
+ The function may sleep longer than requested so don't rely on this for accurate
+ musical timing.
+*}
+procedure Pa_Sleep( msec: Longint ); cdecl; external LibName;
+
+implementation
+
+end.
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