/[pcsx2_0.9.7]/trunk/3rdparty/portaudio/pablio/pablio.c
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Annotation of /trunk/3rdparty/portaudio/pablio/pablio.c

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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 7 months ago) by william
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committing r3113 initial commit again...
1 william 31 /*
2     * $Id: pablio.c 1151 2006-11-29 02:11:16Z leland_lucius $
3     * pablio.c
4     * Portable Audio Blocking Input/Output utility.
5     *
6     * Author: Phil Burk, http://www.softsynth.com
7     *
8     * This program uses the PortAudio Portable Audio Library.
9     * For more information see: http://www.portaudio.com
10     * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
11     *
12     * Permission is hereby granted, free of charge, to any person obtaining
13     * a copy of this software and associated documentation files
14     * (the "Software"), to deal in the Software without restriction,
15     * including without limitation the rights to use, copy, modify, merge,
16     * publish, distribute, sublicense, and/or sell copies of the Software,
17     * and to permit persons to whom the Software is furnished to do so,
18     * subject to the following conditions:
19     *
20     * The above copyright notice and this permission notice shall be
21     * included in all copies or substantial portions of the Software.
22     *
23     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24     * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25     * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
26     * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
27     * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
28     * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
29     * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30     */
31    
32     /*
33     * The text above constitutes the entire PortAudio license; however,
34     * the PortAudio community also makes the following non-binding requests:
35     *
36     * Any person wishing to distribute modifications to the Software is
37     * requested to send the modifications to the original developer so that
38     * they can be incorporated into the canonical version. It is also
39     * requested that these non-binding requests be included along with the
40     * license above.
41     */
42    
43     #include <stdio.h>
44     #include <stdlib.h>
45     #include <math.h>
46     #include "portaudio.h"
47     #include "pa_ringbuffer.h"
48     #include "pablio.h"
49     #include <string.h>
50    
51     /************************************************************************/
52     /******** Constants *****************************************************/
53     /************************************************************************/
54    
55     #define FRAMES_PER_BUFFER (256)
56    
57     /************************************************************************/
58     /******** Prototypes ****************************************************/
59     /************************************************************************/
60    
61     static int blockingIOCallback( void *inputBuffer, void *outputBuffer,
62     unsigned long framesPerBuffer,
63     PaTimestamp outTime, void *userData );
64     static PaError PABLIO_InitFIFO( RingBuffer *rbuf, long numFrames, long bytesPerFrame );
65     static PaError PABLIO_TermFIFO( RingBuffer *rbuf );
66    
67     /************************************************************************/
68     /******** Functions *****************************************************/
69     /************************************************************************/
70    
71     /* Called from PortAudio.
72     * Read and write data only if there is room in FIFOs.
73     */
74     static int blockingIOCallback( void *inputBuffer, void *outputBuffer,
75     unsigned long framesPerBuffer,
76     PaTimestamp outTime, void *userData )
77     {
78     PABLIO_Stream *data = (PABLIO_Stream*)userData;
79     long numBytes = data->bytesPerFrame * framesPerBuffer;
80     (void) outTime;
81    
82     /* This may get called with NULL inputBuffer during initial setup. */
83     if( inputBuffer != NULL )
84     {
85     PaUtil_WriteRingBuffer( &data->inFIFO, inputBuffer, numBytes );
86     }
87     if( outputBuffer != NULL )
88     {
89     int i;
90     int numRead = PaUtil_ReadRingBuffer( &data->outFIFO, outputBuffer, numBytes );
91     /* Zero out remainder of buffer if we run out of data. */
92     for( i=numRead; i<numBytes; i++ )
93     {
94     ((char *)outputBuffer)[i] = 0;
95     }
96     }
97    
98     return 0;
99     }
100    
101     /* Allocate buffer. */
102     static PaError PABLIO_InitFIFO( RingBuffer *rbuf, long numFrames, long bytesPerFrame )
103     {
104     long numBytes = numFrames * bytesPerFrame;
105     char *buffer = (char *) malloc( numBytes );
106     if( buffer == NULL ) return paInsufficientMemory;
107     memset( buffer, 0, numBytes );
108     return (PaError) PaUtil_InitializeRingBuffer( rbuf, numBytes, buffer );
109     }
110    
111     /* Free buffer. */
112     static PaError PABLIO_TermFIFO( RingBuffer *rbuf )
113     {
114     if( rbuf->buffer ) free( rbuf->buffer );
115     rbuf->buffer = NULL;
116     return paNoError;
117     }
118    
119     /************************************************************
120     * Write data to ring buffer.
121     * Will not return until all the data has been written.
122     */
123     long WriteAudioStream( PABLIO_Stream *aStream, void *data, long numFrames )
124     {
125     long bytesWritten;
126     char *p = (char *) data;
127     long numBytes = aStream->bytesPerFrame * numFrames;
128     while( numBytes > 0)
129     {
130     bytesWritten = PaUtil_WriteRingBuffer( &aStream->outFIFO, p, numBytes );
131     numBytes -= bytesWritten;
132     p += bytesWritten;
133     if( numBytes > 0) Pa_Sleep(10);
134     }
135     return numFrames;
136     }
137    
138     /************************************************************
139     * Read data from ring buffer.
140     * Will not return until all the data has been read.
141     */
142     long ReadAudioStream( PABLIO_Stream *aStream, void *data, long numFrames )
143     {
144     long bytesRead;
145     char *p = (char *) data;
146     long numBytes = aStream->bytesPerFrame * numFrames;
147     while( numBytes > 0)
148     {
149     bytesRead = PaUtil_ReadRingBuffer( &aStream->inFIFO, p, numBytes );
150     numBytes -= bytesRead;
151     p += bytesRead;
152     if( numBytes > 0) Pa_Sleep(10);
153     }
154     return numFrames;
155     }
156    
157     /************************************************************
158     * Return the number of frames that could be written to the stream without
159     * having to wait.
160     */
161     long GetAudioStreamWriteable( PABLIO_Stream *aStream )
162     {
163     int bytesEmpty = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
164     return bytesEmpty / aStream->bytesPerFrame;
165     }
166    
167     /************************************************************
168     * Return the number of frames that are available to be read from the
169     * stream without having to wait.
170     */
171     long GetAudioStreamReadable( PABLIO_Stream *aStream )
172     {
173     int bytesFull = PaUtil_GetRingBufferReadAvailable( &aStream->inFIFO );
174     return bytesFull / aStream->bytesPerFrame;
175     }
176    
177     /************************************************************/
178     static unsigned long RoundUpToNextPowerOf2( unsigned long n )
179     {
180     long numBits = 0;
181     if( ((n-1) & n) == 0) return n; /* Already Power of two. */
182     while( n > 0 )
183     {
184     n= n>>1;
185     numBits++;
186     }
187     return (1<<numBits);
188     }
189    
190     /************************************************************
191     * Opens a PortAudio stream with default characteristics.
192     * Allocates PABLIO_Stream structure.
193     *
194     * flags parameter can be an ORed combination of:
195     * PABLIO_READ, PABLIO_WRITE, or PABLIO_READ_WRITE,
196     * and either PABLIO_MONO or PABLIO_STEREO
197     */
198     PaError OpenAudioStream( PABLIO_Stream **rwblPtr, double sampleRate,
199     PaSampleFormat format, long flags )
200     {
201     long bytesPerSample;
202     long doRead = 0;
203     long doWrite = 0;
204     PaError err;
205     PABLIO_Stream *aStream;
206     long minNumBuffers;
207     long numFrames;
208    
209     /* Allocate PABLIO_Stream structure for caller. */
210     aStream = (PABLIO_Stream *) malloc( sizeof(PABLIO_Stream) );
211     if( aStream == NULL ) return paInsufficientMemory;
212     memset( aStream, 0, sizeof(PABLIO_Stream) );
213    
214     /* Determine size of a sample. */
215     bytesPerSample = Pa_GetSampleSize( format );
216     if( bytesPerSample < 0 )
217     {
218     err = (PaError) bytesPerSample;
219     goto error;
220     }
221     aStream->samplesPerFrame = ((flags&PABLIO_MONO) != 0) ? 1 : 2;
222     aStream->bytesPerFrame = bytesPerSample * aStream->samplesPerFrame;
223    
224     /* Initialize PortAudio */
225     err = Pa_Initialize();
226     if( err != paNoError ) goto error;
227    
228     /* Warning: numFrames must be larger than amount of data processed per interrupt
229     * inside PA to prevent glitches. Just to be safe, adjust size upwards.
230     */
231     minNumBuffers = 2 * Pa_GetMinNumBuffers( FRAMES_PER_BUFFER, sampleRate );
232     numFrames = minNumBuffers * FRAMES_PER_BUFFER;
233     numFrames = RoundUpToNextPowerOf2( numFrames );
234    
235     /* Initialize Ring Buffers */
236     doRead = ((flags & PABLIO_READ) != 0);
237     doWrite = ((flags & PABLIO_WRITE) != 0);
238     if(doRead)
239     {
240     err = PABLIO_InitFIFO( &aStream->inFIFO, numFrames, aStream->bytesPerFrame );
241     if( err != paNoError ) goto error;
242     }
243     if(doWrite)
244     {
245     long numBytes;
246     err = PABLIO_InitFIFO( &aStream->outFIFO, numFrames, aStream->bytesPerFrame );
247     if( err != paNoError ) goto error;
248     /* Make Write FIFO appear full initially. */
249     numBytes = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
250     PaUtil_AdvanceRingBufferWriteIndex( &aStream->outFIFO, numBytes );
251     }
252    
253     /* Open a PortAudio stream that we will use to communicate with the underlying
254     * audio drivers. */
255     err = Pa_OpenStream(
256     &aStream->stream,
257     (doRead ? Pa_GetDefaultInputDeviceID() : paNoDevice),
258     (doRead ? aStream->samplesPerFrame : 0 ),
259     format,
260     NULL,
261     (doWrite ? Pa_GetDefaultOutputDeviceID() : paNoDevice),
262     (doWrite ? aStream->samplesPerFrame : 0 ),
263     format,
264     NULL,
265     sampleRate,
266     FRAMES_PER_BUFFER,
267     minNumBuffers,
268     paClipOff, /* we won't output out of range samples so don't bother clipping them */
269     blockingIOCallback,
270     aStream );
271     if( err != paNoError ) goto error;
272    
273     err = Pa_StartStream( aStream->stream );
274     if( err != paNoError ) goto error;
275    
276     *rwblPtr = aStream;
277     return paNoError;
278    
279     error:
280     CloseAudioStream( aStream );
281     *rwblPtr = NULL;
282     return err;
283     }
284    
285     /************************************************************/
286     PaError CloseAudioStream( PABLIO_Stream *aStream )
287     {
288     PaError err;
289     int bytesEmpty;
290     int byteSize = aStream->outFIFO.bufferSize;
291    
292     /* If we are writing data, make sure we play everything written. */
293     if( byteSize > 0 )
294     {
295     bytesEmpty = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
296     while( bytesEmpty < byteSize )
297     {
298     Pa_Sleep( 10 );
299     bytesEmpty = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
300     }
301     }
302    
303     err = Pa_StopStream( aStream->stream );
304     if( err != paNoError ) goto error;
305     err = Pa_CloseStream( aStream->stream );
306     if( err != paNoError ) goto error;
307     Pa_Terminate();
308    
309     error:
310     PABLIO_TermFIFO( &aStream->inFIFO );
311     PABLIO_TermFIFO( &aStream->outFIFO );
312     free( aStream );
313     return err;
314     }

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