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227 lines
8.1 KiB
C++
227 lines
8.1 KiB
C++
//
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// audio.cpp
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// interface
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//
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// Created by Stephen Birarda on 1/22/13.
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// Copyright (c) 2013 Rosedale Lab. All rights reserved.
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//
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#include <iostream>
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#include <fstream>
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#include "audio.h"
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bool Audio::initialized;
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PaError Audio::err;
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PaStream *Audio::stream;
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Audio::AudioData *Audio::data;
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/**
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* Audio callback used by portaudio.
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* Communicates with Audio via a shared pointer to Audio::data.
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* Writes input audio channels (if they exist) into Audio::data->buffer,
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multiplied by Audio::data->inputGain.
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* Then writes Audio::data->buffer into output audio channels, and clears
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the portion of Audio::data->buffer that has been read from for reuse.
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*
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* @param[in] inputBuffer A pointer to an internal portaudio data buffer containing data read by portaudio.
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* @param[out] outputBuffer A pointer to an internal portaudio data buffer to be read by the configured output device.
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* @param[in] frames Number of frames that portaudio requests to be read/written.
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(Valid size of input/output buffers = frames * number of channels (2) * sizeof data type (float)).
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* @param[in] timeInfo Portaudio time info. Currently unused.
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* @param[in] statusFlags Portaudio status flags. Currently unused.
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* @param[in] userData Pointer to supplied user data (in this case, a pointer to Audio::data).
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Used to communicate with external code (since portaudio calls this function from another thread).
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* @return Should be of type PaStreamCallbackResult. Return paComplete to end the stream, or paContinue to continue (default).
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Can be used to end the stream from within the callback.
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*/
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int audioCallback (const void *inputBuffer,
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void *outputBuffer,
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unsigned long frames,
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const PaStreamCallbackTimeInfo *timeInfo,
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PaStreamCallbackFlags statusFlags,
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void *userData)
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{
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Audio::AudioData *data = (Audio::AudioData *) userData;
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int16_t *outputLeft = ((int16_t **) outputBuffer)[0];
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int16_t *outputRight = ((int16_t **) outputBuffer)[1];
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// float yawRatio = 0;
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// int numSamplesDelay = abs(floor(yawRatio * PHASE_DELAY_AT_90));
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//
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// if (numSamplesDelay > PHASE_DELAY_AT_90) {
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// numSamplesDelay = PHASE_DELAY_AT_90;
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// }
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//
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// int16_t *leadingBuffer = yawRatio > 0 ? outputLeft : outputRight;
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// int16_t *trailingBuffer = yawRatio > 0 ? outputRight : outputLeft;
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//
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int16_t *samplesToQueue = new int16_t[BUFFER_LENGTH_BYTES];
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for (int s = 0; s < AUDIO_SOURCES; s++) {
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int wrapAroundSamples = (BUFFER_LENGTH_BYTES / sizeof(int16_t)) - (data->sources[s].lengthInSamples - data->sources[s].samplePointer);
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if (wrapAroundSamples <= 0) {
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memcpy(samplesToQueue, data->sources[s].audioData + data->sources[s].samplePointer, BUFFER_LENGTH_BYTES);
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data->sources[s].samplePointer += (BUFFER_LENGTH_BYTES / sizeof(int16_t));
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} else {
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memcpy(samplesToQueue, data->sources[s].audioData + data->sources[s].samplePointer, (data->sources[s].lengthInSamples - data->sources[s].samplePointer) * sizeof(int16_t));
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memcpy(samplesToQueue + (data->sources[s].lengthInSamples - data->sources[s].samplePointer), data->sources[s].audioData, wrapAroundSamples * sizeof(int16_t));
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data->sources[s].samplePointer = wrapAroundSamples;
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}
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glm::vec3 headPos = data->linkedHead->getPos();
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glm::vec3 sourcePos = data->sources[s].position;
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float distance = sqrtf(powf(-headPos[0] - sourcePos[0], 2) + powf(-headPos[2] - sourcePos[2], 2));
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float amplitudeRatio = powf(0.5, cbrtf(distance * 10));
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for (int i = 0; i < BUFFER_LENGTH_BYTES / sizeof(int16_t); i++) {
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samplesToQueue[i] *= amplitudeRatio;
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outputLeft[i] = s == 0 ? samplesToQueue[i] : outputLeft[i] + samplesToQueue[i];
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}
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if (wrapAroundSamples > 0) {
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delete[] samplesToQueue;
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}
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}
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for (int f = 0; f < BUFFER_LENGTH_BYTES; f++) {
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outputLeft[f] = (int) floor(outputLeft[f] / AUDIO_SOURCES);
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outputRight[f] = outputLeft[f];
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}
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// int offsetBytes = numSamplesDelay * sizeof(int16_t);
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// memcpy(trailingBuffer, data->sources[1].delayBuffer + (PHASE_DELAY_AT_90 - numSamplesDelay), offsetBytes);
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// memcpy(trailingBuffer + numSamplesDelay, samplesToQueue, BUFFER_LENGTH_BYTES - offsetBytes);
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// // copy PHASE_DELAY_AT_90 samples to delayBuffer in case we need it next go around
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// memcpy(data->sources[1].delayBuffer, data->sources[1].audioData + data->sources[1].samplePointer - PHASE_DELAY_AT_90, PHASE_DELAY_AT_90 * sizeof(int16_t));
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return paContinue;
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}
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/**
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* Initialize portaudio and start an audio stream.
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* Should be called at the beginning of program exection.
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* @seealso Audio::terminate
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* @return Returns true if successful or false if an error occurred.
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Use Audio::getError() to retrieve the error code.
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*/
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bool Audio::init()
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{
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Head deadHead = Head();
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return Audio::init(&deadHead);
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}
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bool Audio::init(Head* mainHead)
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{
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data = new AudioData();
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data->linkedHead = mainHead;
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err = Pa_Initialize();
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if (err != paNoError) goto error;
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err = Pa_OpenDefaultStream(&stream,
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NULL, // input channels
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2, // output channels
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(paInt16 | paNonInterleaved), // sample format
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22050, // sample rate (hz)
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512, // frames per buffer
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audioCallback, // callback function
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(void *) data); // user data to be passed to callback
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if (err != paNoError) goto error;
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data->sources[0].position = glm::vec3(3, 0, -1);
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readFile("love.raw", &data->sources[0]);
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data->sources[1].position = glm::vec3(-1, 0, 3);
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readFile("grayson.raw", &data->sources[1]);
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initialized = true;
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// start the stream now that sources are good to go
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Pa_StartStream(stream);
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if (err != paNoError) goto error;
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return paNoError;
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error:
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fprintf(stderr, "-- Failed to initialize portaudio --\n");
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fprintf(stderr, "PortAudio error (%d): %s\n", err, Pa_GetErrorText(err));
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initialized = false;
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delete[] data;
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return false;
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}
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void Audio::sourceSetup()
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{
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if (initialized) {
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// render gl objects on screen for our sources
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glPushMatrix();
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glTranslatef(data->sources[0].position[0], data->sources[0].position[1], data->sources[0].position[2]);
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glColor3f(1, 0, 0);
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glutSolidCube(0.5);
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glPopMatrix();
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glPushMatrix();
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glTranslatef(data->sources[1].position[0], data->sources[1].position[1], data->sources[1].position[2]);
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glColor3f(0, 0, 1);
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glutSolidCube(0.5);
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glPopMatrix();
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}
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}
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void Audio::readFile(const char *filename, struct AudioSource *source)
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{
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FILE *soundFile = fopen(filename, "r");
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// get length of file:
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std::fseek(soundFile, 0, SEEK_END);
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source->lengthInSamples = std::ftell(soundFile) / sizeof(int16_t);
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std::rewind(soundFile);
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source->audioData = new int16_t[source->lengthInSamples];
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std::fread(source->audioData, sizeof(int16_t), source->lengthInSamples, soundFile);
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std::fclose(soundFile);
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}
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/**
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* Close the running audio stream, and deinitialize portaudio.
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* Should be called at the end of program execution.
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* @return Returns true if the initialization was successful, or false if an error occured.
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The error code may be retrieved by Audio::getError().
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*/
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bool Audio::terminate ()
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{
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if (!initialized) {
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return true;
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} else {
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initialized = false;
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err = Pa_CloseStream(stream);
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if (err != paNoError) goto error;
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delete data;
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err = Pa_Terminate();
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if (err != paNoError) goto error;
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return true;
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}
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error:
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fprintf(stderr, "-- portaudio termination error --\n");
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fprintf(stderr, "PortAudio error (%d): %s\n", err, Pa_GetErrorText(err));
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return false;
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}
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