125 lines
3.8 KiB
C++
125 lines
3.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QMessageBox>
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#include "audiooutput.h"
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#include "audiofifo.h"
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int AudioOutput::callbackHelper(
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const void *inputBuffer,
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void *outputBuffer,
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unsigned long framesPerBuffer,
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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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AudioOutput* audioOutput = (AudioOutput*)userData;
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if(outputBuffer == NULL)
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return 0;
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return audioOutput->callback(inputBuffer, outputBuffer, framesPerBuffer, timeInfo, statusFlags);
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}
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int AudioOutput::callback(
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const void* inputBuffer,
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void* outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo*
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timeInfo, PaStreamCallbackFlags statusFlags)
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{
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Q_UNUSED(inputBuffer);
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Q_UNUSED(timeInfo);
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Q_UNUSED(statusFlags);
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int needed = framesPerBuffer * 4;
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int done = m_audioFifo->read((quint8*)outputBuffer, needed, 1);
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memset(((quint8*)outputBuffer) + done, 0x00, needed - done);
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m_streamStartTime += (PaTime)framesPerBuffer / (PaTime)m_sampleRate;
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return 0;
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}
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AudioOutput::AudioOutput() :
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m_stream(NULL),
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m_audioFifo(NULL),
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m_sampleRate(0)
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{
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}
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AudioOutput::~AudioOutput()
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{
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stop();
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}
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bool AudioOutput::start(int device, int rate, AudioFifo* audioFifo)
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{
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if(m_stream != NULL)
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stop();
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PaStreamParameters outputParameters;
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const PaStreamInfo* streamInfo;
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PaError err;
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m_audioFifo = audioFifo;
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outputParameters.device = device;
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outputParameters.channelCount = 2;
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outputParameters.sampleFormat = paInt16;
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outputParameters.suggestedLatency = Pa_GetDeviceInfo(outputParameters.device)->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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qDebug("AudioOutput: open");
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if((err = Pa_OpenStream(&m_stream, NULL, &outputParameters, rate, 1024, paClipOff, callbackHelper, this)) != paNoError)
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goto failed;
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qDebug("AudioOutput: start");
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m_streamStartTime = Pa_GetStreamTime(m_stream);
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if((err = Pa_StartStream(m_stream)) != paNoError)
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goto failed;
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streamInfo = Pa_GetStreamInfo(m_stream);
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m_sampleRate = streamInfo->sampleRate;
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qDebug("AudioOutput: playback has started (%s @ %d Hz)", Pa_GetDeviceInfo(outputParameters.device)->name, rate);
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return true;
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failed:
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qCritical("AudioOutput: playback failed: %s (%d)", Pa_GetErrorText(err), err);
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Pa_CloseStream(m_stream);
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m_stream = NULL;
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m_sampleRate = 0;
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return false;
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}
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void AudioOutput::stop()
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{
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if(m_stream != NULL) {
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Pa_StopStream(m_stream);
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Pa_CloseStream(m_stream);
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m_stream = NULL;
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m_sampleRate = 0;
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qDebug("AudioOutput: stopped");
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}
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}
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int AudioOutput::bufferedSamples()
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{
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return (Pa_GetStreamTime(m_stream) - m_streamStartTime) * m_sampleRate;
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}
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