src/zm_mpeg.h

Rama master · réplica de lectura del repositorio original.

/*
 * ZoneMinder MPEG Interface, $Date$, $Revision$
 * Copyright (C) 2001-2008 Philip Coombes
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef ZM_MPEG_H
#define ZM_MPEG_H

#include "zm_ffmpeg.h"
#include <pthread.h>
#include <array>
#include <vector>

class Image;

class VideoStream {
 protected:
  struct MimeData {
    const char *format;
    const char *mime_type;
  };

 protected:
  static bool initialised;
  static struct MimeData mime_data[];

 protected:
  char *codec_and_format;
  const char *filename;
  const char *format;
  const char *codec_name;
  enum _AVPIXELFORMAT pf;
  const AVOutputFormat *of;
  AVFormatContext *ofc;
  AVStream *ost;
  AVCodecContext *codec_context;
  const AVCodec *codec;
  av_frame_ptr opicture;
  av_frame_ptr tmp_opicture;
  uint8_t *video_outbuf;
  int video_outbuf_size;
  double last_pts;
  bool stream_opened;

  pthread_t streaming_thread;
  bool do_streaming;
  bool add_timestamp;
  unsigned int timestamp;
  uint8_t *buffer_copy;
  pthread_mutex_t *buffer_copy_lock;
  int buffer_copy_size;
  int buffer_copy_used;
  std::array<av_packet_ptr, 2> packet_buffers;
  int packet_index;
  // EncodeImage's conversion target and scaler, reused from frame to frame.
  std::vector<uint8_t> packed_image;
  SwsContext *pack_context;
  int SendPacket(AVPacket *packet);
  static void* StreamingThreadCallback(void *ctx);

 protected:
  static void Initialise();

  void SetupFormat( );
  int SetupCodec( int colours, int subpixelorder, int width, int height, int bitrate, double frame_rate );
  void SetParameters();
  void ActuallyOpenStream();
  double ActuallyEncodeFrame( const uint8_t *buffer, int buffer_size, bool add_timestamp=false, unsigned int timestamp=0 );

 public:
  VideoStream( const char *filename, const char *format, int bitrate, double frame_rate, int colours, int subpixelorder, int width, int height );
  ~VideoStream();
  const char *MimeType() const;
  bool OpenStream();
  double EncodeFrame( const uint8_t *buffer, int buffer_size, bool add_timestamp=false, unsigned int timestamp=0 );
  // Encode an Image of any size, pixel format and stride. EncodeFrame copies its
  // buffer into one sized for the dimensions and format the stream was opened
  // with, packed with no row padding, so a frame that differs in any of those
  // (an event from another monitor, a text frame in the monitor's RGB32 after
  // RGB24 event frames, a 32-byte aligned stride) would overrun it. This
  // converts to exactly that layout first.
  double EncodeImage(const Image &image, bool add_timestamp=false, unsigned int timestamp=0);
  // Convert image into out as a packed (align 1) buffer of pf at width x height,
  // reusing *context. An image of another shape is fitted inside, keeping its
  // aspect ratio, on black. Returns false if the conversion could not be set up.
  static void FillBlack(AVPixelFormat pf, int height, uint8_t *data[4], const int linesize[4]);
  static bool PackImage(const Image &image, AVPixelFormat pf, int width, int height,
                        std::vector<uint8_t> &out, SwsContext **context);
};

#endif // ZM_MPEG_H