/**
 * 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 ffmpegVirtualFile.h
 * @author jyelon
 * @date 2007-08-01
 */

#ifndef FFMPEGVIRTUALFILE_H
#define FFMPEGVIRTUALFILE_H

#include "pandabase.h"
#include "config_movies.h"
#include "filename.h"
#include "subfileInfo.h"

#include <stdarg.h>
extern "C" {
  #include <libavformat/avio.h>
}

struct URLContext;
struct AVFormatContext;

/**
 * Enables ffmpeg to access panda's VFS.  Create an instance of the
 * FfmpegVirtualFile for each ffmpeg stream you wish to open.
 */
class EXPCL_FFMPEG FfmpegVirtualFile {
public:
  FfmpegVirtualFile();
  FfmpegVirtualFile(const FfmpegVirtualFile &copy) = delete;
  ~FfmpegVirtualFile();

  FfmpegVirtualFile &operator = (const FfmpegVirtualFile &copy) = delete;

  bool open_vfs(const Filename &filename);
  bool open_subfile(const SubfileInfo &info);
  void close();

  INLINE bool is_open() const;
  INLINE AVFormatContext *get_format_context() const;

  static void register_protocol();

private:
  // These are callbacks passed to ffmpeg and cannot change signature.
  static int read_packet(void *opaque, uint8_t *buf, int buf_size);
  static int64_t seek(void *opaque, int64_t offset, int whence);

  static void log_callback(void *ptr, int level, const char *fmt, va_list v1);

private:
  AVIOContext *_io_context;
  AVFormatContext *_format_context;
  std::streampos _start;
  std::streamsize _size;
  std::istream *_in;
  pifstream _file_in;
  bool _owns_in;
  int _buffer_size;
};

#include "ffmpegVirtualFile.I"

#endif // FFMPEGVIRTUALFILE_H