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project/fm_viewer/fav/AudioDecoder.cpp

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+/******************************************************************************
+    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 "AudioDecoder.h"
+#include "AVDecoder_p.h"
+#include "AVCompat.h"
+#include "AudioResampler.h"
+#include "factory.h"
+#include "Logger.h"
+
+namespace FAV {
+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 FAV