fork from github

src/AudioGeneratorOpus.h

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+/*
+  AudioGeneratorOpus
+  Audio output generator that plays Opus audio files
+    
+  Copyright (C) 2020  Earle F. Philhower, III
+
+  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 _AUDIOGENERATOROPUS_H
+#define _AUDIOGENERATOROPUS_H
+
+#include <AudioGenerator.h>
+//#include "libopus/opus.h"
+#include "opusfile/opusfile.h"
+
+class AudioGeneratorOpus : public AudioGenerator
+{
+  public:
+    AudioGeneratorOpus();
+    virtual ~AudioGeneratorOpus() override;
+    virtual bool begin(AudioFileSource *source, AudioOutput *output) override;
+    virtual bool loop() override;
+    virtual bool stop() override;
+    virtual bool isRunning() override;
+
+  protected:
+    // Opus callbacks, need static functions to bounce into C++ from C
+    static int OPUS_read(void *_stream, unsigned char *_ptr, int _nbytes) {
+      return static_cast<AudioGeneratorOpus*>(_stream)->read_cb(_ptr, _nbytes);
+    }
+    static int OPUS_seek(void *_stream, opus_int64 _offset, int _whence) {
+      return static_cast<AudioGeneratorOpus*>(_stream)->seek_cb(_offset, _whence);
+    }
+    static opus_int64 OPUS_tell(void *_stream) {
+      return static_cast<AudioGeneratorOpus*>(_stream)->tell_cb();
+    }
+    static int OPUS_close(void *_stream) {
+      return static_cast<AudioGeneratorOpus*>(_stream)->close_cb();
+    }
+
+    // Actual Opus callbacks
+    int read_cb(unsigned char *_ptr, int _nbytes);
+    int seek_cb(opus_int64 _offset, int _whence);
+    opus_int64 tell_cb();
+    int close_cb();
+
+  private:
+    OpusFileCallbacks cb = {OPUS_read, OPUS_seek, OPUS_tell, OPUS_close};
+    OggOpusFile *of;
+    int prev_li; // To detect changes in streams
+
+    int16_t *buff;
+    uint32_t buffPtr;
+    uint32_t buffLen;
+};
+
+#endif
+