diff options
Diffstat (limited to 'record.c')
| -rw-r--r-- | record.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/record.c b/record.c new file mode 100644 index 0000000..41b984d --- /dev/null +++ b/record.c @@ -0,0 +1,231 @@ +#include <stdlib.h> +#include <stdio.h> +#include <portaudio.h> + + +#define SAMPLE_RATE (8000) +#define FRAMES_PER_BUFFER (512) +#define NUM_CHANNELS (2) +#define DITHER_FLAG (1) +#define WRITE_TO_FILE (1) + +#define PA_SAMPLE_TYPE paInt16 +#define SAMPLE_SILENCE (0) +#define PRINTF_S_FORMAT "%d" + +typedef short SAMPLE; + +typedef struct +{ + int frameIndex; /* Index into sample array. */ + int maxFrameIndex; + SAMPLE *recordedSamples; +}paTestData; + + +static int recordCallback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ){ + paTestData *data = (paTestData*)userData; + const SAMPLE *rptr = (const SAMPLE*)inputBuffer; + SAMPLE *wptr = &data->recordedSamples[data->frameIndex * NUM_CHANNELS]; + long framesToCalc; + long i; + int finished; + unsigned long framesLeft = data->maxFrameIndex - data->frameIndex; + + (void) outputBuffer; /* Prevent unused variable warnings. */ + (void) timeInfo; + (void) statusFlags; + (void) userData; + + if( framesLeft < framesPerBuffer ) + { + framesToCalc = framesLeft; + finished = paComplete; + } + else + { + framesToCalc = framesPerBuffer; + finished = paContinue; + } + + if( inputBuffer == NULL ) + { + for( i=0; i<framesToCalc; i++ ) + { + *wptr++ = SAMPLE_SILENCE; /* left */ + if( NUM_CHANNELS == 2 ) *wptr++ = SAMPLE_SILENCE; /* right */ + } + } + else + { + for( i=0; i<framesToCalc; i++ ) + { + *wptr++ = *rptr++; /* left */ + if( NUM_CHANNELS == 2 ) *wptr++ = *rptr++; /* right */ + } + } + data->frameIndex += framesToCalc; + return finished; +} +static int playCallback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) + { + paTestData *data = (paTestData*)userData; + SAMPLE *rptr = &data->recordedSamples[data->frameIndex * NUM_CHANNELS]; + SAMPLE *wptr = (SAMPLE*)outputBuffer; + unsigned int i; + int finished; + unsigned int framesLeft = data->maxFrameIndex - data->frameIndex; + + (void) inputBuffer; /* Prevent unused variable warnings. */ + (void) timeInfo; + (void) statusFlags; + (void) userData; + + if( framesLeft < framesPerBuffer ) + { + /* final buffer... */ + for( i=0; i<framesLeft; i++ ) + { + *wptr++ = *rptr++; /* left */ + if( NUM_CHANNELS == 2 ) *wptr++ = *rptr++; /* right */ + } + for( ; i<framesPerBuffer; i++ ) + { + *wptr++ = 0; /* left */ + if( NUM_CHANNELS == 2 ) *wptr++ = 0; /* right */ + } + data->frameIndex += framesLeft; + finished = paComplete; + } + else + { + for( i=0; i<framesPerBuffer; i++ ) + { + *wptr++ = *rptr++; /* left */ + if( NUM_CHANNELS == 2 ) *wptr++ = *rptr++; /* right */ + } + data->frameIndex += framesPerBuffer; + finished = paContinue; + } + return finished; + } + +int record(int NUM_SECONDS){ + PaStream* stream; + PaError err = paNoError; + PaStreamParameters inputParameters, outputParameters; + paTestData data; + int numBytes; + int i; + SAMPLE max, val; + int totalFrames; + double average; + int numSamples; + data.maxFrameIndex = totalFrames = NUM_SECONDS * SAMPLE_RATE; + data.frameIndex = 0; + numSamples = totalFrames * NUM_CHANNELS; + numBytes = numSamples * sizeof(SAMPLE); + data.recordedSamples = (SAMPLE *) malloc( numBytes ); + if( data.recordedSamples == NULL ) + { + printf("Could not allocate record array.\n"); + goto done; + } + for( i=0; i<numSamples; i++ ) data.recordedSamples[i] = 0; + + err = Pa_Initialize(); + if( err != paNoError ) goto done; + + inputParameters.device = Pa_GetDefaultInputDevice(); + if (inputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default input device.\n"); + goto done; + } + inputParameters.channelCount = 2; + inputParameters.sampleFormat = PA_SAMPLE_TYPE; + inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency; + inputParameters.hostApiSpecificStreamInfo = NULL; + + /* Record some audio. -------------------------------------------- */ + err = Pa_OpenStream( + &stream, + &inputParameters, + NULL, /* &outputParameters, */ + SAMPLE_RATE, + FRAMES_PER_BUFFER, + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + recordCallback, + &data ); + if( err != paNoError ) goto done; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto done; + printf("=== NOW RECORDING ===\n"); fflush(stdout); + + while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) + { + Pa_Sleep(1000); + printf("index = %d\n", data.frameIndex ); fflush(stdout); + } + if( err < 0 ) goto done; + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto done; + + /* Measure maximum peak amplitude. */ + max = 0; + average = 0.0; + for( i=0; i<numSamples; i++ ) + { + val = data.recordedSamples[i]; + if( val < 0 ) val = -val; /* ABS */ + if( val > max ) + { + max = val; + } + average += val; + } + + average = average / (double)numSamples; + + /* printf("sample max amplitude = "PRINTF_S_FORMAT"\n", max ); */ + /* printf("sample average = %lf\n", average ); */ + + /* Write recorded data to a file. */ +#if WRITE_TO_FILE + { + FILE *fid; + fid = fopen("recorded.raw", "wb"); + if( fid == NULL ) + { + printf("Could not open file."); + } + else + { + fwrite( data.recordedSamples, NUM_CHANNELS * sizeof(SAMPLE), totalFrames, fid ); + fclose( fid ); + /* printf("Wrote data to 'recorded.raw'\n"); */ + } + } +#endif + +done: + Pa_Terminate(); + if( data.recordedSamples ) /* Sure it is NULL or valid. */ + free( data.recordedSamples ); + if( err != paNoError ) + { + 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 ) ); + err = 1; /* Always return 0 or 1, but no other return codes. */ + } +} |