/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file ffmpegAudioCursor.h
 * @author jyelon
 * @date 2007-08-01
 */

#ifndef FFMPEGAUDIOCURSOR_H
#define FFMPEGAUDIOCURSOR_H

#include "pandabase.h"

#include "movieAudioCursor.h"
#include "namable.h"
#include "texture.h"
#include "pointerTo.h"
#include "ffmpegVirtualFile.h"

extern "C" {
  #include <libavcodec/avcodec.h>
}

class FfmpegAudio;
struct AVFormatContext;
struct AVCodecContext;
struct AVStream;
struct AVPacket;
struct SwrContext;

/**
 * A stream that generates a sequence of audio samples.
 */
class EXPCL_FFMPEG FfmpegAudioCursor : public MovieAudioCursor {
  friend class FfmpegAudio;

PUBLISHED:
  FfmpegAudioCursor(FfmpegAudio *src);
  virtual ~FfmpegAudioCursor();
  virtual void seek(double offset);

public:
  virtual int read_samples(int n, int16_t *data);

protected:
  void fetch_packet();
  bool reload_buffer();
  void cleanup();
  Filename _filename;
  int _initial_dts;
  AVPacket *_packet;
  int            _packet_size;
  unsigned char *_packet_data;
  AVFormatContext *_format_ctx;
  AVCodecContext  *_audio_ctx;
  FfmpegVirtualFile _ffvfile;
  int _audio_index;
  double _audio_timebase;

  AVFrame  *_frame;
  int16_t *_buffer;
  int       _buffer_size;
  int16_t *_buffer_alloc;
  int       _buffer_head;
  int       _buffer_tail;

  SwrContext *_resample_ctx;

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    MovieAudioCursor::init_type();
    register_type(_type_handle, "FfmpegAudioCursor",
                  MovieAudioCursor::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#include "ffmpegAudioCursor.I"

#endif // FFMPEGAUDIOCURSOR_H