cannam@140: /* cannam@140: * $Id$ cannam@140: * test_rw_echo.c cannam@140: * Echo delayed input to output. cannam@140: * cannam@140: * Author: Phil Burk, http://www.softsynth.com/portaudio/ cannam@140: * cannam@140: * This program uses PABLIO, the Portable Audio Blocking I/O Library. cannam@140: * PABLIO is built on top of PortAudio, the Portable Audio Library. cannam@140: * cannam@140: * Note that if you need low latency, you should not use PABLIO. cannam@140: * Use the PA_OpenStream callback technique which is lower level cannam@140: * than PABLIO. cannam@140: * cannam@140: * For more information see: http://www.portaudio.com cannam@140: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@140: * cannam@140: * Permission is hereby granted, free of charge, to any person obtaining cannam@140: * a copy of this software and associated documentation files cannam@140: * (the "Software"), to deal in the Software without restriction, cannam@140: * including without limitation the rights to use, copy, modify, merge, cannam@140: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@140: * and to permit persons to whom the Software is furnished to do so, cannam@140: * subject to the following conditions: cannam@140: * cannam@140: * The above copyright notice and this permission notice shall be cannam@140: * included in all copies or substantial portions of the Software. cannam@140: * cannam@140: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@140: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@140: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@140: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@140: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@140: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@140: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@140: */ cannam@140: cannam@140: /* cannam@140: * The text above constitutes the entire PortAudio license; however, cannam@140: * the PortAudio community also makes the following non-binding requests: cannam@140: * cannam@140: * Any person wishing to distribute modifications to the Software is cannam@140: * requested to send the modifications to the original developer so that cannam@140: * they can be incorporated into the canonical version. It is also cannam@140: * requested that these non-binding requests be included along with the cannam@140: * license above. cannam@140: */ cannam@140: cannam@140: #include cannam@140: #include cannam@140: #include cannam@140: #include "pablio.h" cannam@140: #include cannam@140: cannam@140: /* cannam@140: ** Note that many of the older ISA sound cards on PCs do NOT support cannam@140: ** full duplex audio (simultaneous record and playback). cannam@140: ** And some only support full duplex at lower sample rates. cannam@140: */ cannam@140: #define SAMPLE_RATE (22050) cannam@140: #define NUM_SECONDS (20) cannam@140: #define SAMPLES_PER_FRAME (2) cannam@140: cannam@140: /* Select whether we will use floats or shorts. */ cannam@140: #if 1 cannam@140: #define SAMPLE_TYPE paFloat32 cannam@140: typedef float SAMPLE; cannam@140: #else cannam@140: #define SAMPLE_TYPE paInt16 cannam@140: typedef short SAMPLE; cannam@140: #endif cannam@140: cannam@140: #define NUM_ECHO_FRAMES (2*SAMPLE_RATE) cannam@140: SAMPLE samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0}; cannam@140: cannam@140: /*******************************************************************/ cannam@140: int main(void); cannam@140: int main(void) cannam@140: { cannam@140: int i; cannam@140: PaError err; cannam@140: PABLIO_Stream *aInStream; cannam@140: PABLIO_Stream *aOutStream; cannam@140: int index; cannam@140: cannam@140: printf("Full duplex sound test using PABLIO\n"); cannam@140: fflush(stdout); cannam@140: cannam@140: /* Open simplified blocking I/O layer on top of PortAudio. */ cannam@140: /* Open input first so it can start to fill buffers. */ cannam@140: err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE, cannam@140: (PABLIO_READ | PABLIO_STEREO) ); cannam@140: if( err != paNoError ) goto error; cannam@140: /* printf("opened input\n"); fflush(stdout); /**/ cannam@140: cannam@140: err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE, cannam@140: (PABLIO_WRITE | PABLIO_STEREO) ); cannam@140: if( err != paNoError ) goto error; cannam@140: /* printf("opened output\n"); fflush(stdout); /**/ cannam@140: cannam@140: /* Process samples in the foreground. */ cannam@140: index = 0; cannam@140: for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ ) cannam@140: { cannam@140: /* Write old frame of data to output. */ cannam@140: /* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */ cannam@140: WriteAudioStream( aOutStream, &samples[index][0], 1 ); cannam@140: cannam@140: /* Read one frame of data into sample array for later output. */ cannam@140: ReadAudioStream( aInStream, &samples[index][0], 1 ); cannam@140: index += 1; cannam@140: if( index >= NUM_ECHO_FRAMES ) index = 0; cannam@140: cannam@140: if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/ cannam@140: } cannam@140: cannam@140: CloseAudioStream( aOutStream ); cannam@140: CloseAudioStream( aInStream ); cannam@140: cannam@140: printf("R/W echo sound test complete.\n" ); cannam@140: fflush(stdout); cannam@140: return 0; cannam@140: cannam@140: error: cannam@140: fprintf( stderr, "An error occured while using PortAudio\n" ); cannam@140: fprintf( stderr, "Error number: %d\n", err ); cannam@140: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@140: return -1; cannam@140: }