diff options
author | Guenter Geiger <ggeiger@users.sourceforge.net> | 2004-02-02 11:28:02 +0000 |
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committer | Guenter Geiger <ggeiger@users.sourceforge.net> | 2004-02-02 11:28:02 +0000 |
commit | ae6b5d89ea93b95c2990895077cf5e8f0bba9ad9 (patch) | |
tree | 1e7570f11ac688e94342968e90301c4684e61193 /pd/portaudio_v18/pa_tests/patest_latency.c | |
parent | f26399eba6ee6ce9eb7bae9a4b60a90dc2ebca94 (diff) |
This commit was generated by cvs2svn to compensate for changes in r1301,
which included commits to RCS files with non-trunk default branches.
svn path=/trunk/; revision=1302
Diffstat (limited to 'pd/portaudio_v18/pa_tests/patest_latency.c')
-rw-r--r-- | pd/portaudio_v18/pa_tests/patest_latency.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/pd/portaudio_v18/pa_tests/patest_latency.c b/pd/portaudio_v18/pa_tests/patest_latency.c new file mode 100644 index 00000000..39ede0a7 --- /dev/null +++ b/pd/portaudio_v18/pa_tests/patest_latency.c @@ -0,0 +1,176 @@ +/* + * $Id: patest_latency.c,v 1.4 2002/03/21 00:58:45 philburk Exp $ + * Hear the latency caused by big buffers. + * Play a sine wave and change frequency based on letter input. + * + * Author: Phil Burk <philburk@softsynth.com>, and Darren Gibbs + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.portaudio.com + * Copyright (c) 1999-2000 Ross Bencina and Phil Burk + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files + * (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * Any person wishing to distribute modifications to the Software is + * requested to send the modifications to the original developer so that + * they can be incorporated into the canonical version. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ +#include <stdio.h> +#include <math.h> +#include "portaudio.h" + +#define OUTPUT_DEVICE (Pa_GetDefaultOutputDeviceID()) +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER (64) + +#if 0 +#define MIN_LATENCY_MSEC (2000) +#define NUM_BUFFERS ((MIN_LATENCY_MSEC * SAMPLE_RATE) / (FRAMES_PER_BUFFER * 1000)) +#else +#define NUM_BUFFERS (0) +#endif + +#define MIN_FREQ (100.0f) +#define CalcPhaseIncrement(freq) ((freq)/SAMPLE_RATE) +#ifndef M_PI +#define M_PI (3.14159265) +#endif +#define TABLE_SIZE (400) +typedef struct +{ + float sine[TABLE_SIZE + 1]; // add one for guard point for interpolation + float phase_increment; + float left_phase; + float right_phase; +} +paTestData; +float LookupSine( paTestData *data, float phase ); +/* Convert phase between and 1.0 to sine value + * using linear interpolation. + */ +float LookupSine( paTestData *data, float phase ) +{ + float fIndex = phase*TABLE_SIZE; + int index = (int) fIndex; + float fract = fIndex - index; + float lo = data->sine[index]; + float hi = data->sine[index+1]; + float val = lo + fract*(hi-lo); + return val; +} +/* This routine will be called by the PortAudio engine when audio is needed. +** It may called at interrupt level on some machines so don't do anything +** that could mess up the system like calling malloc() or free(). +*/ +static int patestCallback( void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + PaTimestamp outTime, void *userData ) +{ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + int i; + int finished = 0; + (void) outTime; /* Prevent unused variable warnings. */ + (void) inputBuffer; + + for( i=0; i<framesPerBuffer; i++ ) + { + *out++ = LookupSine(data, data->left_phase); /* left */ + *out++ = LookupSine(data, data->right_phase); /* right */ + data->left_phase += data->phase_increment; + if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f; + data->right_phase += (data->phase_increment * 1.5f); /* fifth above */ + if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f; + } + return 0; +} +/*******************************************************************/ +int main(void); +int main(void) +{ + PortAudioStream *stream; + PaError err; + paTestData data; + int i; + int done = 0; + printf("PortAudio Test: enter letter then hit ENTER. numBuffers = %d\n", NUM_BUFFERS ); + /* initialise sinusoidal wavetable */ + for( i=0; i<TABLE_SIZE; i++ ) + { + data.sine[i] = 0.90f * (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); + } + data.sine[TABLE_SIZE] = data.sine[0]; // set guard point + data.left_phase = data.right_phase = 0.0; + data.phase_increment = CalcPhaseIncrement(MIN_FREQ); + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + printf("PortAudio Test: output device = %d\n", OUTPUT_DEVICE ); + err = Pa_OpenStream( + &stream, + paNoDevice, + 0, /* no input */ + paFloat32, /* 32 bit floating point input */ + NULL, + OUTPUT_DEVICE, + 2, /* stereo output */ + paFloat32, /* 32 bit floating point output */ + NULL, + SAMPLE_RATE, + FRAMES_PER_BUFFER, + NUM_BUFFERS, /* number of buffers, if zero then use default minimum */ + paClipOff|paDitherOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + &data ); + if( err != paNoError ) goto error; + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error; + printf("Play ASCII keyboard. Hit 'q' to stop. (Use RETURN key on Mac)\n"); + fflush(stdout); + while ( !done ) + { + float freq; + int index; + char c; + do + { + c = getchar(); + } + while( c < ' '); /* Strip white space and control chars. */ + + if( c == 'q' ) done = 1; + index = c % 26; + freq = MIN_FREQ + (index * 40.0); + data.phase_increment = CalcPhaseIncrement(freq); + } + printf("Call Pa_StopStream()\n"); + err = Pa_StopStream( stream ); + if( err != paNoError ) goto error; + Pa_Terminate(); + printf("Test finished.\n"); + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occured while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |