AudioDecoder.cpp

/******************************************************************************
    QtAV:  Multimedia framework based on Qt and FFmpeg
    Copyright (C) 2012-2016 Wang Bin <wbsecg1@gmail.com>

*   This file is part of QtAV

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
******************************************************************************/

#include "QtAV/AudioDecoder.h"
#include "QtAV/private/AVDecoder_p.h"
#include "QtAV/private/AVCompat.h"
#include "QtAV/AudioResampler.h"
#include "QtAV/private/factory.h"
#include "utils/Logger.h"

namespace QtAV {
FACTORY_DEFINE(AudioDecoder)
// TODO: why vc can not declare extern func in a class member? resolved as &func@@YAXXZ
extern bool RegisterAudioDecoderFFmpeg_Man();
void AudioDecoder::registerAll() {
    static bool done = false;
    if (done)
        return;
    done = true;
    RegisterAudioDecoderFFmpeg_Man();
}

QStringList AudioDecoder::supportedCodecs()
{
    static QStringList codecs;
    if (!codecs.isEmpty())
        return codecs;
    avcodec_register_all();
    AVCodec* c = NULL;
    while ((c=av_codec_next(c))) {
        if (!av_codec_is_decoder(c) || c->type != AVMEDIA_TYPE_AUDIO)
            continue;
        codecs.append(QString::fromLatin1(c->name));
    }
    return codecs;
}

AudioDecoderPrivate::AudioDecoderPrivate()
    : AVDecoderPrivate()
    , resampler(0)
{
    resampler = AudioResampler::create(AudioResamplerId_FF);
    if (!resampler)
        resampler = AudioResampler::create(AudioResamplerId_Libav);
    if (resampler)
        resampler->setOutSampleFormat(AV_SAMPLE_FMT_FLT);
}

AudioDecoderPrivate::~AudioDecoderPrivate()
{
    if (resampler) {
        delete resampler;
        resampler = 0;
    }
}

AudioDecoder::AudioDecoder(AudioDecoderPrivate &d):
    AVDecoder(d)
{
}

QString AudioDecoder::name() const
{
    return QLatin1String(AudioDecoder::name(id()));
}

QByteArray AudioDecoder::data() const
{
    return d_func().decoded;
}

AudioResampler* AudioDecoder::resampler()
{
    return d_func().resampler;
}

} //namespace QtAV