gearmulator

Emulation of classic VA synths of the late 90s/2000s that are based on Motorola 56300 family DSPs
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pa_stream.c (5314B)

      1 /*
      2  * $Id$
      3  * Portable Audio I/O Library
      4  * stream interface
      5  *
      6  * Based on the Open Source API proposed by Ross Bencina
      7  * Copyright (c) 2008 Ross Bencina
      8  *
      9  * Permission is hereby granted, free of charge, to any person obtaining
     10  * a copy of this software and associated documentation files
     11  * (the "Software"), to deal in the Software without restriction,
     12  * including without limitation the rights to use, copy, modify, merge,
     13  * publish, distribute, sublicense, and/or sell copies of the Software,
     14  * and to permit persons to whom the Software is furnished to do so,
     15  * subject to the following conditions:
     16  *
     17  * The above copyright notice and this permission notice shall be
     18  * included in all copies or substantial portions of the Software.
     19  *
     20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     23  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
     24  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
     25  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     26  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     27  */
     28 
     29 /*
     30  * The text above constitutes the entire PortAudio license; however, 
     31  * the PortAudio community also makes the following non-binding requests:
     32  *
     33  * Any person wishing to distribute modifications to the Software is
     34  * requested to send the modifications to the original developer so that
     35  * they can be incorporated into the canonical version. It is also 
     36  * requested that these non-binding requests be included along with the 
     37  * license above.
     38  */
     39 
     40 /** @file
     41  @ingroup common_src
     42 
     43  @brief Stream interfaces, representation structures and helper functions
     44  used to interface between pa_front.c host API implementations.
     45 */
     46 
     47 
     48 #include "pa_stream.h"
     49 
     50 
     51 void PaUtil_InitializeStreamInterface( PaUtilStreamInterface *streamInterface,
     52                                        PaError (*Close)( PaStream* ),
     53                                        PaError (*Start)( PaStream* ),
     54                                        PaError (*Stop)( PaStream* ),
     55                                        PaError (*Abort)( PaStream* ),
     56                                        PaError (*IsStopped)( PaStream* ),
     57                                        PaError (*IsActive)( PaStream* ),
     58                                        PaTime (*GetTime)( PaStream* ),
     59                                        double (*GetCpuLoad)( PaStream* ),
     60                                        PaError (*Read)( PaStream*, void *, unsigned long ),
     61                                        PaError (*Write)( PaStream*, const void *, unsigned long ),
     62                                        signed long (*GetReadAvailable)( PaStream* ),
     63                                        signed long (*GetWriteAvailable)( PaStream* )  )
     64 {
     65     streamInterface->Close = Close;
     66     streamInterface->Start = Start;
     67     streamInterface->Stop = Stop;
     68     streamInterface->Abort = Abort;
     69     streamInterface->IsStopped = IsStopped;
     70     streamInterface->IsActive = IsActive;
     71     streamInterface->GetTime = GetTime;
     72     streamInterface->GetCpuLoad = GetCpuLoad;
     73     streamInterface->Read = Read;
     74     streamInterface->Write = Write;
     75     streamInterface->GetReadAvailable = GetReadAvailable;
     76     streamInterface->GetWriteAvailable = GetWriteAvailable;
     77 }
     78 
     79 
     80 void PaUtil_InitializeStreamRepresentation( PaUtilStreamRepresentation *streamRepresentation,
     81         PaUtilStreamInterface *streamInterface,
     82         PaStreamCallback *streamCallback,
     83         void *userData )
     84 {
     85     streamRepresentation->magic = PA_STREAM_MAGIC;
     86     streamRepresentation->nextOpenStream = 0;
     87     streamRepresentation->streamInterface = streamInterface;
     88     streamRepresentation->streamCallback = streamCallback;
     89     streamRepresentation->streamFinishedCallback = 0;
     90 
     91     streamRepresentation->userData = userData;
     92 
     93     streamRepresentation->streamInfo.inputLatency = 0.;
     94     streamRepresentation->streamInfo.outputLatency = 0.;
     95     streamRepresentation->streamInfo.sampleRate = 0.;
     96 }
     97 
     98 
     99 void PaUtil_TerminateStreamRepresentation( PaUtilStreamRepresentation *streamRepresentation )
    100 {
    101     streamRepresentation->magic = 0;
    102 }
    103 
    104 
    105 PaError PaUtil_DummyRead( PaStream* stream,
    106                                void *buffer,
    107                                unsigned long frames )
    108 {
    109     (void)stream; /* unused parameter */
    110     (void)buffer; /* unused parameter */
    111     (void)frames; /* unused parameter */
    112 
    113     return paCanNotReadFromACallbackStream;
    114 }
    115 
    116 
    117 PaError PaUtil_DummyWrite( PaStream* stream,
    118                                const void *buffer,
    119                                unsigned long frames )
    120 {
    121     (void)stream; /* unused parameter */
    122     (void)buffer; /* unused parameter */
    123     (void)frames; /* unused parameter */
    124 
    125     return paCanNotWriteToACallbackStream;
    126 }
    127 
    128 
    129 signed long PaUtil_DummyGetReadAvailable( PaStream* stream )
    130 {
    131     (void)stream; /* unused parameter */
    132 
    133     return paCanNotReadFromACallbackStream;
    134 }
    135 
    136 
    137 signed long PaUtil_DummyGetWriteAvailable( PaStream* stream )
    138 {
    139     (void)stream; /* unused parameter */
    140 
    141     return paCanNotWriteToACallbackStream;
    142 }
    143 
    144 
    145 double PaUtil_DummyGetCpuLoad( PaStream* stream )
    146 {
    147     (void)stream; /* unused parameter */
    148 
    149     return 0.0;
    150 }