mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-13 15:41:50 -05:00
8d353a5b3b
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
808 lines
27 KiB
C
808 lines
27 KiB
C
/*
|
|
* $Id$
|
|
* Portable Audio I/O Library skeleton implementation
|
|
* demonstrates how to use the common functions to implement support
|
|
* for a host API
|
|
*
|
|
* Based on the Open Source API proposed by Ross Bencina
|
|
* Copyright (c) 1999-2002 Ross Bencina, 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.
|
|
*/
|
|
|
|
/** @file
|
|
@brief Skeleton implementation of support for a host API.
|
|
|
|
@note This file is provided as a starting point for implementing support for
|
|
a new host API. IMPLEMENT ME comments are used to indicate functionality
|
|
which much be customised for each implementation.
|
|
*/
|
|
|
|
|
|
#include <string.h> /* strlen() */
|
|
|
|
#include "pa_util.h"
|
|
#include "pa_allocation.h"
|
|
#include "pa_hostapi.h"
|
|
#include "pa_stream.h"
|
|
#include "pa_cpuload.h"
|
|
#include "pa_process.h"
|
|
|
|
|
|
/* prototypes for functions declared in this file */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif /* __cplusplus */
|
|
|
|
PaError PaSkeleton_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex index );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
|
|
|
|
static void Terminate( struct PaUtilHostApiRepresentation *hostApi );
|
|
static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi,
|
|
const PaStreamParameters *inputParameters,
|
|
const PaStreamParameters *outputParameters,
|
|
double sampleRate );
|
|
static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi,
|
|
PaStream** s,
|
|
const PaStreamParameters *inputParameters,
|
|
const PaStreamParameters *outputParameters,
|
|
double sampleRate,
|
|
unsigned long framesPerBuffer,
|
|
PaStreamFlags streamFlags,
|
|
PaStreamCallback *streamCallback,
|
|
void *userData );
|
|
static PaError CloseStream( PaStream* stream );
|
|
static PaError StartStream( PaStream *stream );
|
|
static PaError StopStream( PaStream *stream );
|
|
static PaError AbortStream( PaStream *stream );
|
|
static PaError IsStreamStopped( PaStream *s );
|
|
static PaError IsStreamActive( PaStream *stream );
|
|
static PaTime GetStreamTime( PaStream *stream );
|
|
static double GetStreamCpuLoad( PaStream* stream );
|
|
static PaError ReadStream( PaStream* stream, void *buffer, unsigned long frames );
|
|
static PaError WriteStream( PaStream* stream, const void *buffer, unsigned long frames );
|
|
static signed long GetStreamReadAvailable( PaStream* stream );
|
|
static signed long GetStreamWriteAvailable( PaStream* stream );
|
|
|
|
|
|
/* IMPLEMENT ME: a macro like the following one should be used for reporting
|
|
host errors */
|
|
#define PA_SKELETON_SET_LAST_HOST_ERROR( errorCode, errorText ) \
|
|
PaUtil_SetLastHostErrorInfo( paInDevelopment, errorCode, errorText )
|
|
|
|
/* PaSkeletonHostApiRepresentation - host api datastructure specific to this implementation */
|
|
|
|
typedef struct
|
|
{
|
|
PaUtilHostApiRepresentation inheritedHostApiRep;
|
|
PaUtilStreamInterface callbackStreamInterface;
|
|
PaUtilStreamInterface blockingStreamInterface;
|
|
|
|
PaUtilAllocationGroup *allocations;
|
|
|
|
/* implementation specific data goes here */
|
|
}
|
|
PaSkeletonHostApiRepresentation; /* IMPLEMENT ME: rename this */
|
|
|
|
|
|
PaError PaSkeleton_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex hostApiIndex )
|
|
{
|
|
PaError result = paNoError;
|
|
int i, deviceCount;
|
|
PaSkeletonHostApiRepresentation *skeletonHostApi;
|
|
PaDeviceInfo *deviceInfoArray;
|
|
|
|
skeletonHostApi = (PaSkeletonHostApiRepresentation*)PaUtil_AllocateMemory( sizeof(PaSkeletonHostApiRepresentation) );
|
|
if( !skeletonHostApi )
|
|
{
|
|
result = paInsufficientMemory;
|
|
goto error;
|
|
}
|
|
|
|
skeletonHostApi->allocations = PaUtil_CreateAllocationGroup();
|
|
if( !skeletonHostApi->allocations )
|
|
{
|
|
result = paInsufficientMemory;
|
|
goto error;
|
|
}
|
|
|
|
*hostApi = &skeletonHostApi->inheritedHostApiRep;
|
|
(*hostApi)->info.structVersion = 1;
|
|
(*hostApi)->info.type = paInDevelopment; /* IMPLEMENT ME: change to correct type id */
|
|
(*hostApi)->info.name = "skeleton implementation"; /* IMPLEMENT ME: change to correct name */
|
|
|
|
(*hostApi)->info.defaultInputDevice = paNoDevice; /* IMPLEMENT ME */
|
|
(*hostApi)->info.defaultOutputDevice = paNoDevice; /* IMPLEMENT ME */
|
|
|
|
(*hostApi)->info.deviceCount = 0;
|
|
|
|
deviceCount = 0; /* IMPLEMENT ME */
|
|
|
|
if( deviceCount > 0 )
|
|
{
|
|
(*hostApi)->deviceInfos = (PaDeviceInfo**)PaUtil_GroupAllocateMemory(
|
|
skeletonHostApi->allocations, sizeof(PaDeviceInfo*) * deviceCount );
|
|
if( !(*hostApi)->deviceInfos )
|
|
{
|
|
result = paInsufficientMemory;
|
|
goto error;
|
|
}
|
|
|
|
/* allocate all device info structs in a contiguous block */
|
|
deviceInfoArray = (PaDeviceInfo*)PaUtil_GroupAllocateMemory(
|
|
skeletonHostApi->allocations, sizeof(PaDeviceInfo) * deviceCount );
|
|
if( !deviceInfoArray )
|
|
{
|
|
result = paInsufficientMemory;
|
|
goto error;
|
|
}
|
|
|
|
for( i=0; i < deviceCount; ++i )
|
|
{
|
|
PaDeviceInfo *deviceInfo = &deviceInfoArray[i];
|
|
deviceInfo->structVersion = 2;
|
|
deviceInfo->hostApi = hostApiIndex;
|
|
deviceInfo->name = 0; /* IMPLEMENT ME: allocate block and copy name eg:
|
|
deviceName = (char*)PaUtil_GroupAllocateMemory( skeletonHostApi->allocations, strlen(srcName) + 1 );
|
|
if( !deviceName )
|
|
{
|
|
result = paInsufficientMemory;
|
|
goto error;
|
|
}
|
|
strcpy( deviceName, srcName );
|
|
deviceInfo->name = deviceName;
|
|
*/
|
|
|
|
deviceInfo->maxInputChannels = 0; /* IMPLEMENT ME */
|
|
deviceInfo->maxOutputChannels = 0; /* IMPLEMENT ME */
|
|
|
|
deviceInfo->defaultLowInputLatency = 0.; /* IMPLEMENT ME */
|
|
deviceInfo->defaultLowOutputLatency = 0.; /* IMPLEMENT ME */
|
|
deviceInfo->defaultHighInputLatency = 0.; /* IMPLEMENT ME */
|
|
deviceInfo->defaultHighOutputLatency = 0.; /* IMPLEMENT ME */
|
|
|
|
deviceInfo->defaultSampleRate = 0.; /* IMPLEMENT ME */
|
|
|
|
(*hostApi)->deviceInfos[i] = deviceInfo;
|
|
++(*hostApi)->info.deviceCount;
|
|
}
|
|
}
|
|
|
|
(*hostApi)->Terminate = Terminate;
|
|
(*hostApi)->OpenStream = OpenStream;
|
|
(*hostApi)->IsFormatSupported = IsFormatSupported;
|
|
|
|
PaUtil_InitializeStreamInterface( &skeletonHostApi->callbackStreamInterface, CloseStream, StartStream,
|
|
StopStream, AbortStream, IsStreamStopped, IsStreamActive,
|
|
GetStreamTime, GetStreamCpuLoad,
|
|
PaUtil_DummyRead, PaUtil_DummyWrite,
|
|
PaUtil_DummyGetReadAvailable, PaUtil_DummyGetWriteAvailable );
|
|
|
|
PaUtil_InitializeStreamInterface( &skeletonHostApi->blockingStreamInterface, CloseStream, StartStream,
|
|
StopStream, AbortStream, IsStreamStopped, IsStreamActive,
|
|
GetStreamTime, PaUtil_DummyGetCpuLoad,
|
|
ReadStream, WriteStream, GetStreamReadAvailable, GetStreamWriteAvailable );
|
|
|
|
return result;
|
|
|
|
error:
|
|
if( skeletonHostApi )
|
|
{
|
|
if( skeletonHostApi->allocations )
|
|
{
|
|
PaUtil_FreeAllAllocations( skeletonHostApi->allocations );
|
|
PaUtil_DestroyAllocationGroup( skeletonHostApi->allocations );
|
|
}
|
|
|
|
PaUtil_FreeMemory( skeletonHostApi );
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
static void Terminate( struct PaUtilHostApiRepresentation *hostApi )
|
|
{
|
|
PaSkeletonHostApiRepresentation *skeletonHostApi = (PaSkeletonHostApiRepresentation*)hostApi;
|
|
|
|
/*
|
|
IMPLEMENT ME:
|
|
- clean up any resources not handled by the allocation group
|
|
*/
|
|
|
|
if( skeletonHostApi->allocations )
|
|
{
|
|
PaUtil_FreeAllAllocations( skeletonHostApi->allocations );
|
|
PaUtil_DestroyAllocationGroup( skeletonHostApi->allocations );
|
|
}
|
|
|
|
PaUtil_FreeMemory( skeletonHostApi );
|
|
}
|
|
|
|
|
|
static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi,
|
|
const PaStreamParameters *inputParameters,
|
|
const PaStreamParameters *outputParameters,
|
|
double sampleRate )
|
|
{
|
|
int inputChannelCount, outputChannelCount;
|
|
PaSampleFormat inputSampleFormat, outputSampleFormat;
|
|
|
|
if( inputParameters )
|
|
{
|
|
inputChannelCount = inputParameters->channelCount;
|
|
inputSampleFormat = inputParameters->sampleFormat;
|
|
|
|
/* all standard sample formats are supported by the buffer adapter,
|
|
this implementation doesn't support any custom sample formats */
|
|
if( inputSampleFormat & paCustomFormat )
|
|
return paSampleFormatNotSupported;
|
|
|
|
/* unless alternate device specification is supported, reject the use of
|
|
paUseHostApiSpecificDeviceSpecification */
|
|
|
|
if( inputParameters->device == paUseHostApiSpecificDeviceSpecification )
|
|
return paInvalidDevice;
|
|
|
|
/* check that input device can support inputChannelCount */
|
|
if( inputChannelCount > hostApi->deviceInfos[ inputParameters->device ]->maxInputChannels )
|
|
return paInvalidChannelCount;
|
|
|
|
/* validate inputStreamInfo */
|
|
if( inputParameters->hostApiSpecificStreamInfo )
|
|
return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */
|
|
}
|
|
else
|
|
{
|
|
inputChannelCount = 0;
|
|
}
|
|
|
|
if( outputParameters )
|
|
{
|
|
outputChannelCount = outputParameters->channelCount;
|
|
outputSampleFormat = outputParameters->sampleFormat;
|
|
|
|
/* all standard sample formats are supported by the buffer adapter,
|
|
this implementation doesn't support any custom sample formats */
|
|
if( outputSampleFormat & paCustomFormat )
|
|
return paSampleFormatNotSupported;
|
|
|
|
/* unless alternate device specification is supported, reject the use of
|
|
paUseHostApiSpecificDeviceSpecification */
|
|
|
|
if( outputParameters->device == paUseHostApiSpecificDeviceSpecification )
|
|
return paInvalidDevice;
|
|
|
|
/* check that output device can support outputChannelCount */
|
|
if( outputChannelCount > hostApi->deviceInfos[ outputParameters->device ]->maxOutputChannels )
|
|
return paInvalidChannelCount;
|
|
|
|
/* validate outputStreamInfo */
|
|
if( outputParameters->hostApiSpecificStreamInfo )
|
|
return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */
|
|
}
|
|
else
|
|
{
|
|
outputChannelCount = 0;
|
|
}
|
|
|
|
/*
|
|
IMPLEMENT ME:
|
|
|
|
- if a full duplex stream is requested, check that the combination
|
|
of input and output parameters is supported if necessary
|
|
|
|
- check that the device supports sampleRate
|
|
|
|
Because the buffer adapter handles conversion between all standard
|
|
sample formats, the following checks are only required if paCustomFormat
|
|
is implemented, or under some other unusual conditions.
|
|
|
|
- check that input device can support inputSampleFormat, or that
|
|
we have the capability to convert from inputSampleFormat to
|
|
a native format
|
|
|
|
- check that output device can support outputSampleFormat, or that
|
|
we have the capability to convert from outputSampleFormat to
|
|
a native format
|
|
*/
|
|
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) sampleRate;
|
|
|
|
return paFormatIsSupported;
|
|
}
|
|
|
|
/* PaSkeletonStream - a stream data structure specifically for this implementation */
|
|
|
|
typedef struct PaSkeletonStream
|
|
{ /* IMPLEMENT ME: rename this */
|
|
PaUtilStreamRepresentation streamRepresentation;
|
|
PaUtilCpuLoadMeasurer cpuLoadMeasurer;
|
|
PaUtilBufferProcessor bufferProcessor;
|
|
|
|
/* IMPLEMENT ME:
|
|
- implementation specific data goes here
|
|
*/
|
|
unsigned long framesPerHostCallback; /* just an example */
|
|
}
|
|
PaSkeletonStream;
|
|
|
|
/* see pa_hostapi.h for a list of validity guarantees made about OpenStream parameters */
|
|
|
|
static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi,
|
|
PaStream** s,
|
|
const PaStreamParameters *inputParameters,
|
|
const PaStreamParameters *outputParameters,
|
|
double sampleRate,
|
|
unsigned long framesPerBuffer,
|
|
PaStreamFlags streamFlags,
|
|
PaStreamCallback *streamCallback,
|
|
void *userData )
|
|
{
|
|
PaError result = paNoError;
|
|
PaSkeletonHostApiRepresentation *skeletonHostApi = (PaSkeletonHostApiRepresentation*)hostApi;
|
|
PaSkeletonStream *stream = 0;
|
|
unsigned long framesPerHostBuffer = framesPerBuffer; /* these may not be equivalent for all implementations */
|
|
int inputChannelCount, outputChannelCount;
|
|
PaSampleFormat inputSampleFormat, outputSampleFormat;
|
|
PaSampleFormat hostInputSampleFormat, hostOutputSampleFormat;
|
|
|
|
|
|
if( inputParameters )
|
|
{
|
|
inputChannelCount = inputParameters->channelCount;
|
|
inputSampleFormat = inputParameters->sampleFormat;
|
|
|
|
/* unless alternate device specification is supported, reject the use of
|
|
paUseHostApiSpecificDeviceSpecification */
|
|
|
|
if( inputParameters->device == paUseHostApiSpecificDeviceSpecification )
|
|
return paInvalidDevice;
|
|
|
|
/* check that input device can support inputChannelCount */
|
|
if( inputChannelCount > hostApi->deviceInfos[ inputParameters->device ]->maxInputChannels )
|
|
return paInvalidChannelCount;
|
|
|
|
/* validate inputStreamInfo */
|
|
if( inputParameters->hostApiSpecificStreamInfo )
|
|
return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */
|
|
|
|
/* IMPLEMENT ME - establish which host formats are available */
|
|
hostInputSampleFormat =
|
|
PaUtil_SelectClosestAvailableFormat( paInt16 /* native formats */, inputSampleFormat );
|
|
}
|
|
else
|
|
{
|
|
inputChannelCount = 0;
|
|
inputSampleFormat = hostInputSampleFormat = paInt16; /* Surpress 'uninitialised var' warnings. */
|
|
}
|
|
|
|
if( outputParameters )
|
|
{
|
|
outputChannelCount = outputParameters->channelCount;
|
|
outputSampleFormat = outputParameters->sampleFormat;
|
|
|
|
/* unless alternate device specification is supported, reject the use of
|
|
paUseHostApiSpecificDeviceSpecification */
|
|
|
|
if( outputParameters->device == paUseHostApiSpecificDeviceSpecification )
|
|
return paInvalidDevice;
|
|
|
|
/* check that output device can support inputChannelCount */
|
|
if( outputChannelCount > hostApi->deviceInfos[ outputParameters->device ]->maxOutputChannels )
|
|
return paInvalidChannelCount;
|
|
|
|
/* validate outputStreamInfo */
|
|
if( outputParameters->hostApiSpecificStreamInfo )
|
|
return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */
|
|
|
|
/* IMPLEMENT ME - establish which host formats are available */
|
|
hostOutputSampleFormat =
|
|
PaUtil_SelectClosestAvailableFormat( paInt16 /* native formats */, outputSampleFormat );
|
|
}
|
|
else
|
|
{
|
|
outputChannelCount = 0;
|
|
outputSampleFormat = hostOutputSampleFormat = paInt16; /* Surpress 'uninitialized var' warnings. */
|
|
}
|
|
|
|
/*
|
|
IMPLEMENT ME:
|
|
|
|
( the following two checks are taken care of by PaUtil_InitializeBufferProcessor() FIXME - checks needed? )
|
|
|
|
- check that input device can support inputSampleFormat, or that
|
|
we have the capability to convert from outputSampleFormat to
|
|
a native format
|
|
|
|
- check that output device can support outputSampleFormat, or that
|
|
we have the capability to convert from outputSampleFormat to
|
|
a native format
|
|
|
|
- if a full duplex stream is requested, check that the combination
|
|
of input and output parameters is supported
|
|
|
|
- check that the device supports sampleRate
|
|
|
|
- alter sampleRate to a close allowable rate if possible / necessary
|
|
|
|
- validate suggestedInputLatency and suggestedOutputLatency parameters,
|
|
use default values where necessary
|
|
*/
|
|
|
|
|
|
|
|
|
|
/* validate platform specific flags */
|
|
if( (streamFlags & paPlatformSpecificFlags) != 0 )
|
|
return paInvalidFlag; /* unexpected platform specific flag */
|
|
|
|
|
|
stream = (PaSkeletonStream*)PaUtil_AllocateMemory( sizeof(PaSkeletonStream) );
|
|
if( !stream )
|
|
{
|
|
result = paInsufficientMemory;
|
|
goto error;
|
|
}
|
|
|
|
if( streamCallback )
|
|
{
|
|
PaUtil_InitializeStreamRepresentation( &stream->streamRepresentation,
|
|
&skeletonHostApi->callbackStreamInterface, streamCallback, userData );
|
|
}
|
|
else
|
|
{
|
|
PaUtil_InitializeStreamRepresentation( &stream->streamRepresentation,
|
|
&skeletonHostApi->blockingStreamInterface, streamCallback, userData );
|
|
}
|
|
|
|
PaUtil_InitializeCpuLoadMeasurer( &stream->cpuLoadMeasurer, sampleRate );
|
|
|
|
|
|
/* we assume a fixed host buffer size in this example, but the buffer processor
|
|
can also support bounded and unknown host buffer sizes by passing
|
|
paUtilBoundedHostBufferSize or paUtilUnknownHostBufferSize instead of
|
|
paUtilFixedHostBufferSize below. */
|
|
|
|
result = PaUtil_InitializeBufferProcessor( &stream->bufferProcessor,
|
|
inputChannelCount, inputSampleFormat, hostInputSampleFormat,
|
|
outputChannelCount, outputSampleFormat, hostOutputSampleFormat,
|
|
sampleRate, streamFlags, framesPerBuffer,
|
|
framesPerHostBuffer, paUtilFixedHostBufferSize,
|
|
streamCallback, userData );
|
|
if( result != paNoError )
|
|
goto error;
|
|
|
|
|
|
/*
|
|
IMPLEMENT ME: initialise the following fields with estimated or actual
|
|
values.
|
|
*/
|
|
stream->streamRepresentation.streamInfo.inputLatency =
|
|
PaUtil_GetBufferProcessorInputLatency(&stream->bufferProcessor);
|
|
stream->streamRepresentation.streamInfo.outputLatency =
|
|
PaUtil_GetBufferProcessorOutputLatency(&stream->bufferProcessor);
|
|
stream->streamRepresentation.streamInfo.sampleRate = sampleRate;
|
|
|
|
|
|
/*
|
|
IMPLEMENT ME:
|
|
- additional stream setup + opening
|
|
*/
|
|
|
|
stream->framesPerHostCallback = framesPerHostBuffer;
|
|
|
|
*s = (PaStream*)stream;
|
|
|
|
return result;
|
|
|
|
error:
|
|
if( stream )
|
|
PaUtil_FreeMemory( stream );
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
ExampleHostProcessingLoop() illustrates the kind of processing which may
|
|
occur in a host implementation.
|
|
|
|
*/
|
|
static void ExampleHostProcessingLoop( void *inputBuffer, void *outputBuffer, void *userData )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)userData;
|
|
PaStreamCallbackTimeInfo timeInfo = {0,0,0}; /* IMPLEMENT ME */
|
|
int callbackResult;
|
|
unsigned long framesProcessed;
|
|
|
|
PaUtil_BeginCpuLoadMeasurement( &stream->cpuLoadMeasurer );
|
|
|
|
/*
|
|
IMPLEMENT ME:
|
|
- generate timing information
|
|
- handle buffer slips
|
|
*/
|
|
|
|
/*
|
|
If you need to byte swap or shift inputBuffer to convert it into a
|
|
portaudio format, do it here.
|
|
*/
|
|
|
|
|
|
|
|
PaUtil_BeginBufferProcessing( &stream->bufferProcessor, &timeInfo, 0 /* IMPLEMENT ME: pass underflow/overflow flags when necessary */ );
|
|
|
|
/*
|
|
depending on whether the host buffers are interleaved, non-interleaved
|
|
or a mixture, you will want to call PaUtil_SetInterleaved*Channels(),
|
|
PaUtil_SetNonInterleaved*Channel() or PaUtil_Set*Channel() here.
|
|
*/
|
|
|
|
PaUtil_SetInputFrameCount( &stream->bufferProcessor, 0 /* default to host buffer size */ );
|
|
PaUtil_SetInterleavedInputChannels( &stream->bufferProcessor,
|
|
0, /* first channel of inputBuffer is channel 0 */
|
|
inputBuffer,
|
|
0 ); /* 0 - use inputChannelCount passed to init buffer processor */
|
|
|
|
PaUtil_SetOutputFrameCount( &stream->bufferProcessor, 0 /* default to host buffer size */ );
|
|
PaUtil_SetInterleavedOutputChannels( &stream->bufferProcessor,
|
|
0, /* first channel of outputBuffer is channel 0 */
|
|
outputBuffer,
|
|
0 ); /* 0 - use outputChannelCount passed to init buffer processor */
|
|
|
|
/* you must pass a valid value of callback result to PaUtil_EndBufferProcessing()
|
|
in general you would pass paContinue for normal operation, and
|
|
paComplete to drain the buffer processor's internal output buffer.
|
|
You can check whether the buffer processor's output buffer is empty
|
|
using PaUtil_IsBufferProcessorOuputEmpty( bufferProcessor )
|
|
*/
|
|
callbackResult = paContinue;
|
|
framesProcessed = PaUtil_EndBufferProcessing( &stream->bufferProcessor, &callbackResult );
|
|
|
|
|
|
/*
|
|
If you need to byte swap or shift outputBuffer to convert it to
|
|
host format, do it here.
|
|
*/
|
|
|
|
PaUtil_EndCpuLoadMeasurement( &stream->cpuLoadMeasurer, framesProcessed );
|
|
|
|
|
|
if( callbackResult == paContinue )
|
|
{
|
|
/* nothing special to do */
|
|
}
|
|
else if( callbackResult == paAbort )
|
|
{
|
|
/* IMPLEMENT ME - finish playback immediately */
|
|
|
|
/* once finished, call the finished callback */
|
|
if( stream->streamRepresentation.streamFinishedCallback != 0 )
|
|
stream->streamRepresentation.streamFinishedCallback( stream->streamRepresentation.userData );
|
|
}
|
|
else
|
|
{
|
|
/* User callback has asked us to stop with paComplete or other non-zero value */
|
|
|
|
/* IMPLEMENT ME - finish playback once currently queued audio has completed */
|
|
|
|
/* once finished, call the finished callback */
|
|
if( stream->streamRepresentation.streamFinishedCallback != 0 )
|
|
stream->streamRepresentation.streamFinishedCallback( stream->streamRepresentation.userData );
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
When CloseStream() is called, the multi-api layer ensures that
|
|
the stream has already been stopped or aborted.
|
|
*/
|
|
static PaError CloseStream( PaStream* s )
|
|
{
|
|
PaError result = paNoError;
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/*
|
|
IMPLEMENT ME:
|
|
- additional stream closing + cleanup
|
|
*/
|
|
|
|
PaUtil_TerminateBufferProcessor( &stream->bufferProcessor );
|
|
PaUtil_TerminateStreamRepresentation( &stream->streamRepresentation );
|
|
PaUtil_FreeMemory( stream );
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static PaError StartStream( PaStream *s )
|
|
{
|
|
PaError result = paNoError;
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
PaUtil_ResetBufferProcessor( &stream->bufferProcessor );
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior */
|
|
|
|
/* suppress unused function warning. the code in ExampleHostProcessingLoop or
|
|
something similar should be implemented to feed samples to and from the
|
|
host after StartStream() is called.
|
|
*/
|
|
(void) ExampleHostProcessingLoop;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static PaError StopStream( PaStream *s )
|
|
{
|
|
PaError result = paNoError;
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior */
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static PaError AbortStream( PaStream *s )
|
|
{
|
|
PaError result = paNoError;
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior */
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static PaError IsStreamStopped( PaStream *s )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior */
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static PaError IsStreamActive( PaStream *s )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior */
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static PaTime GetStreamTime( PaStream *s )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static double GetStreamCpuLoad( PaStream* s )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
return PaUtil_GetCpuLoad( &stream->cpuLoadMeasurer );
|
|
}
|
|
|
|
|
|
/*
|
|
As separate stream interfaces are used for blocking and callback
|
|
streams, the following functions can be guaranteed to only be called
|
|
for blocking streams.
|
|
*/
|
|
|
|
static PaError ReadStream( PaStream* s,
|
|
void *buffer,
|
|
unsigned long frames )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) buffer;
|
|
(void) frames;
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior*/
|
|
|
|
return paNoError;
|
|
}
|
|
|
|
|
|
static PaError WriteStream( PaStream* s,
|
|
const void *buffer,
|
|
unsigned long frames )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) buffer;
|
|
(void) frames;
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior*/
|
|
|
|
return paNoError;
|
|
}
|
|
|
|
|
|
static signed long GetStreamReadAvailable( PaStream* s )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static signed long GetStreamWriteAvailable( PaStream* s )
|
|
{
|
|
PaSkeletonStream *stream = (PaSkeletonStream*)s;
|
|
|
|
/* suppress unused variable warnings */
|
|
(void) stream;
|
|
|
|
/* IMPLEMENT ME, see portaudio.h for required behavior*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|