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Diffstat (limited to 'examples/multimedia/audiodecoder/audiodecoder.cpp')
| -rw-r--r-- | examples/multimedia/audiodecoder/audiodecoder.cpp | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/examples/multimedia/audiodecoder/audiodecoder.cpp b/examples/multimedia/audiodecoder/audiodecoder.cpp new file mode 100644 index 000000000..1505a881e --- /dev/null +++ b/examples/multimedia/audiodecoder/audiodecoder.cpp @@ -0,0 +1,188 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "audiodecoder.h" +#include <stdio.h> + +AudioDecoder::AudioDecoder(bool isPlayback, bool isDelete) + : m_cout(stdout, QIODevice::WriteOnly) +{ + m_isPlayback = isPlayback; + m_isDelete = isDelete; + + // Make sure the data we receive is in correct PCM format. + // Our wav file writer only supports SignedInt sample type. + QAudioFormat format; + format.setChannelCount(2); + format.setSampleSize(16); + format.setSampleRate(48000); + format.setCodec("audio/pcm"); + format.setSampleType(QAudioFormat::SignedInt); + m_decoder.setAudioFormat(format); + + connect(&m_decoder, SIGNAL(bufferReady()), this, SLOT(bufferReady())); + connect(&m_decoder, SIGNAL(error(QAudioDecoder::Error)), this, SLOT(error(QAudioDecoder::Error))); + connect(&m_decoder, SIGNAL(stateChanged(QAudioDecoder::State)), this, SLOT(stateChanged(QAudioDecoder::State))); + connect(&m_decoder, SIGNAL(finished()), this, SLOT(finished())); + connect(&m_decoder, SIGNAL(positionChanged(qint64)), this, SLOT(updateProgress())); + connect(&m_decoder, SIGNAL(durationChanged(qint64)), this, SLOT(updateProgress())); + + connect(&m_soundEffect, SIGNAL(statusChanged()), this, SLOT(playbackStatusChanged())); + connect(&m_soundEffect, SIGNAL(playingChanged()), this, SLOT(playingChanged())); + + m_progress = -1.0; +} + +void AudioDecoder::setSourceFilename(const QString &fileName) +{ + m_decoder.setSourceFilename(fileName); +} + +void AudioDecoder::start() +{ + m_decoder.start(); +} + +void AudioDecoder::stop() +{ + m_decoder.stop(); +} + +void AudioDecoder::setTargetFilename(const QString &fileName) +{ + m_targetFilename = fileName; +} + +void AudioDecoder::bufferReady() +{ + // read a buffer from audio decoder + QAudioBuffer buffer = m_decoder.read(); + if (!buffer.isValid()) + return; + + if (!m_fileWriter.isOpen() && !m_fileWriter.open(m_targetFilename, buffer.format())) { + m_decoder.stop(); + return; + } + + m_fileWriter.write(buffer); +} + +void AudioDecoder::error(QAudioDecoder::Error error) +{ + switch (error) { + case QAudioDecoder::NoError: + return; + case QAudioDecoder::ResourceError: + m_cout << "Resource error" << endl; + break; + case QAudioDecoder::FormatError: + m_cout << "Format error" << endl; + break; + case QAudioDecoder::AccessDeniedError: + m_cout << "Access denied error" << endl; + break; + case QAudioDecoder::ServiceMissingError: + m_cout << "Service missing error" << endl; + break; + } + + emit done(); +} + +void AudioDecoder::stateChanged(QAudioDecoder::State newState) +{ + switch (newState) { + case QAudioDecoder::DecodingState: + m_cout << "Decoding..." << endl; + break; + case QAudioDecoder::StoppedState: + m_cout << "Decoding stopped" << endl; + break; + } +} + +void AudioDecoder::finished() +{ + if (!m_fileWriter.close()) + m_cout << "Failed to finilize output file" << endl; + + m_cout << "Decoding finished" << endl; + + if (m_isPlayback) { + m_cout << "Starting playback" << endl; + m_soundEffect.setSource(QUrl::fromLocalFile(m_targetFilename)); + m_soundEffect.play(); + } else { + emit done(); + } +} + +void AudioDecoder::playbackStatusChanged() +{ + if (m_soundEffect.status() == QSoundEffect::Error) { + m_cout << "Playback error" << endl; + emit done(); + } +} + +void AudioDecoder::playingChanged() +{ + if (!m_soundEffect.isPlaying()) { + m_cout << "Playback finished" << endl; + if (m_isDelete) + QFile::remove(m_targetFilename); + emit done(); + } +} + +void AudioDecoder::updateProgress() +{ + qint64 position = m_decoder.position(); + qint64 duration = m_decoder.duration(); + qreal progress = m_progress; + if (position >= 0 && duration > 0) + progress = position / (qreal)duration; + + if (progress > m_progress + 0.1) { + m_cout << "Decoding progress: " << (int)(progress * 100.0) << "%" << endl; + m_progress = progress; + } +} |