zoneminder/src/zm_ffmpeg_camera.h

//
// ZoneMinder Ffmpeg Class Interface, $Date: 2008-07-25 10:33:23 +0100 (Fri, 25 Jul 2008) $, $Revision: 2611 $
// 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_FFMPEG_CAMERA_H
#define ZM_FFMPEG_CAMERA_H

#include "zm_camera.h"

#if HAVE_LIBAVUTIL_HWCONTEXT_H
typedef struct DecodeContext {
      AVBufferRef *hw_device_ref;
} DecodeContext;
#endif
//
// Class representing 'ffmpeg' cameras, i.e. those which are
// accessed using ffmpeg multimedia framework
//
class FfmpegCamera : public Camera {
  protected:
    std::string         mPath;
    std::string         mSecondPath;
    std::string         mMethod;
    std::string         mOptions;

    std::string         encoder_options;
    std::string         hwaccel_name;
    std::string         hwaccel_device;

    int frameCount;    

#if HAVE_LIBAVFORMAT
    AVFormatContext     *mFormatContext[2];
    int                 mFormats;
    int                 mFormatIndex;
    int                 mVideoStreamId;
    int                 mAudioStreamId;
    AVCodecContext      *mVideoCodecContext;
    AVCodecContext      *mAudioCodecContext;
    AVCodec             *mVideoCodec;
    AVCodec             *mAudioCodec;
    _AVPIXELFORMAT      imagePixFormat;

    bool                use_hwaccel; //will default to on if hwaccel specified, will get turned off if there is a failure
#if HAVE_LIBAVUTIL_HWCONTEXT_H
    AVBufferRef *hw_device_ctx = nullptr;
#endif

    // Used to store the incoming packet, it will get copied when queued. 
    // We only ever need one at a time, so instead of constantly allocating
    // and freeing this structure, we will just make it a member of the object.
    AVPacket packet;       

    int OpenFfmpeg();
    int Close();
    bool mCanCapture;

#if HAVE_LIBSWSCALE
    struct SwsContext   *mConvertContext;
#endif

    int                 error_count;

  public:
    FfmpegCamera(
        const Monitor *monitor,
        const std::string &path,
        const std::string &second_path,
        const std::string &p_method,
        const std::string &p_options,
        int p_width,
        int p_height,
        int p_colours,
        int p_brightness,
        int p_contrast,
        int p_hue,
        int p_colour,
        bool p_capture,
        bool p_record_audio,
        const std::string &p_hwaccel_name,
        const std::string &p_hwaccel_device
        );
    ~FfmpegCamera();

    const std::string &Path() const { return mPath; }
    const std::string &Options() const { return mOptions; } 
    const std::string &Method() const { return mMethod; }

    int PrimeCapture();
    int PreCapture();
    int Capture(ZMPacket &p);
    int PostCapture();
  private:
    static int FfmpegInterruptCallback(void*ctx);
};
#endif // ZM_FFMPEG_CAMERA_H