audio: merged all processors into single versatile object

app/audio/audioprocessor.h

@@ -0,0 +1,77 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef AUDIOPROCESSOR_H
+#define AUDIOPROCESSOR_H
+
+#include <inttypes.h>
+
+extern "C" {
+#include <libavfilter/avfilter.h>
+}
+
+#include "render/audioparams.h"
+
+namespace olive {
+
+class AudioProcessor
+{
+public:
+  AudioProcessor();
+
+  ~AudioProcessor();
+
+  DISABLE_COPY_MOVE(AudioProcessor)
+
+  bool Open(const AudioParams &from, const AudioParams &to, double tempo = 1.0);
+
+  void Close();
+
+  bool IsOpen() const { return filter_graph_; }
+
+  using Buffer = QVector<QByteArray>;
+  int Convert(float **in, int nb_in_samples, AudioProcessor::Buffer *output);
+
+  void Flush();
+
+private:
+  static AVFilterContext* CreateTempoFilter(AVFilterGraph *graph, AVFilterContext *link, const double& tempo);
+
+  AVFilterGraph* filter_graph_;
+
+  AVFilterContext* buffersrc_ctx_;
+
+  AVFilterContext* buffersink_ctx_;
+
+  AudioParams from_;
+  AVSampleFormat from_fmt_;
+
+  AudioParams to_;
+  AVSampleFormat to_fmt_;
+
+  AVFrame *in_frame_;
+
+  AVFrame *out_frame_;
+
+};
+
+}
+
+#endif // AUDIOPROCESSOR_H