1 /*---------------------------------------------------------------------------* 2 * AudioInRecord.c * 3 * * 4 * Copyright 2007, 2008 Nuance Communciations, Inc. * 5 * * 6 * Licensed under the Apache License, Version 2.0 (the 'License'); * 7 * you may not use this file except in compliance with the License. * 8 * * 9 * You may obtain a copy of the License at * 10 * http://www.apache.org/licenses/LICENSE-2.0 * 11 * * 12 * Unless required by applicable law or agreed to in writing, software * 13 * distributed under the License is distributed on an 'AS IS' BASIS, * 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * 15 * See the License for the specific language governing permissions and * 16 * limitations under the License. * 17 * * 18 *---------------------------------------------------------------------------*/ 19 20 #include <stdlib.h> 21 #include <stdio.h> 22 #include <limits.h> 23 #include <string.h> 24 #ifdef WIN32 25 #include <windows.h> 26 #include <mmsystem.h> 27 #endif 28 #include "audioin.h" 29 30 #define SAMPLING_RATE 11025 31 32 #define N_FRAMES_PER_BUFFER 512 /* low-level driver counts in terms of frames, not samples */ 33 #define N_TUPLES_PER_FRAME 1 /* tuple: a set of samples (set of 1 if mono, set of 2 if stereo */ 34 #define N_CHANNELS_PER_TUPLE 1 /* 1: mono; 2: stereo */ 35 36 #define N_TUPLES_PER_BUFFER (N_FRAMES_PER_BUFFER * N_TUPLES_PER_FRAME) 37 #define N_SAMPLES_PER_BUFFER (N_TUPLES_PER_BUFFER * N_CHANNELS_PER_TUPLE) 38 39 #define N_SECONDS_TO_RECORD 10 40 #define N_SAMPLES_TO_RECORD (N_SECONDS_TO_RECORD * SAMPLING_RATE * N_CHANNELS_PER_TUPLE) 41 42 #define OUTPUT_FILENAME "output_AudioInRecord.pcm" 43 44 typedef short typeSample; 45 46 /* store incoming samples here, then write to file at the end */ 47 typeSample recordedSamples[N_SAMPLES_TO_RECORD]; 48 49 50 int main(int argc, char* argv[]) 51 { 52 AUDIOIN_H hAudioIn; 53 AUDIOIN_INFO AudioInInfo; 54 LHS_AUDIOIN_ERROR lhsErr; 55 unsigned int nSamples; 56 57 printf("\nAudioTestRecord: capturing %u seconds of audio at %u Hz\n\n", N_SECONDS_TO_RECORD, SAMPLING_RATE); 58 59 memset(recordedSamples, 0, N_SAMPLES_TO_RECORD * sizeof(typeSample)); 60 61 printf("Opening the AudioIn device: "); 62 lhsErr = lhs_audioinOpen(WAVE_MAPPER, SAMPLING_RATE, &hAudioIn); 63 printf("lhs_audioinOpen() returns %ld\n", lhsErr); 64 if (lhsErr != LHS_AUDIOIN_OK) 65 { 66 printf("ERROR: Unable to open audio device\n\n"); 67 return 1; 68 } 69 70 printf("Starting the AudioIn device: "); 71 lhsErr = lhs_audioinStart(hAudioIn); 72 printf("lhs_audioinStart() returns %ld\n", lhsErr); 73 if (lhsErr != LHS_AUDIOIN_OK) 74 { 75 printf("ERROR: Unable to start audio device\n\n"); 76 printf("Closing the AudioIn device: "); 77 lhsErr = lhs_audioinClose(&hAudioIn); 78 printf("lhs_audioinClose() returns %ld\n", lhsErr); 79 if (lhsErr != LHS_AUDIOIN_OK) 80 { 81 printf("ERROR: Unable to close audio device\n\n"); 82 return 1; 83 } 84 return 1; 85 } 86 87 printf("... Start Speaking ...\n"); 88 89 nSamples = 0; 90 while (nSamples <= N_SAMPLES_TO_RECORD - N_SAMPLES_PER_BUFFER) 91 { 92 unsigned long u32NbrOfSamples; 93 94 u32NbrOfSamples = N_SAMPLES_PER_BUFFER / N_CHANNELS_PER_TUPLE; /* audioin only does mono */ 95 lhsErr = lhs_audioinGetSamples(hAudioIn, &u32NbrOfSamples, &(recordedSamples[nSamples]), &AudioInInfo); 96 if (lhsErr == LHS_AUDIOIN_OK) 97 nSamples += u32NbrOfSamples; 98 else 99 printf("ERROR: lhs_audioinGetSamples() returns %ld\n", lhsErr); 100 } 101 102 printf("Stopping the AudioIn device: "); 103 lhsErr = lhs_audioinStop(hAudioIn); 104 printf("lhs_audioinStop() returns %ld\n", lhsErr); 105 if (lhsErr != LHS_AUDIOIN_OK) 106 { 107 printf("ERROR: Unable to stop audio device\n\n"); 108 printf("Closing the AudioIn device: "); 109 lhsErr = lhs_audioinClose(&hAudioIn); 110 printf("lhs_audioinClose() returns %ld\n", lhsErr); 111 if (lhsErr != LHS_AUDIOIN_OK) 112 { 113 printf("ERROR: Unable to close audio device\n\n"); 114 return 1; 115 } 116 return 1; 117 } 118 119 printf("Closing the AudioIn device: "); 120 lhsErr = lhs_audioinClose(&hAudioIn); 121 printf("lhs_audioinClose() returns %ld\n", lhsErr); 122 if (lhsErr != LHS_AUDIOIN_OK) 123 { 124 printf("ERROR: Unable to close audio device\n\n"); 125 return 1; 126 } 127 128 /* write to file */ 129 { 130 FILE *fpOutput; 131 char *szFilename = OUTPUT_FILENAME; 132 133 fpOutput = fopen(szFilename, "wb"); 134 if (fpOutput == NULL) 135 { 136 printf("ERROR: cannot create output file: '%s'\n", szFilename); 137 return 1; 138 } 139 fwrite(recordedSamples, sizeof(typeSample), nSamples, fpOutput); 140 fclose(fpOutput); 141 142 printf("\nOutput audio saved to '%s'\n\n", szFilename); 143 } 144 145 146 return 0; 147 } 148
