/* This file is part of the Pangolin Project.
 * http://github.com/stevenlovegrove/Pangolin
 *
 * Copyright (c) 2011 Steven Lovegrove
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once

#include <pangolin/pangolin.h>
#include <pangolin/video/video.h>

extern "C"
{

// HACK for some versions of FFMPEG
#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif

#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/pixdesc.h>
#include <libavcodec/avcodec.h>
}

#ifndef HAVE_FFMPEG_AVPIXELFORMAT
#  define AVPixelFormat PixelFormat
#endif

namespace pangolin
{

class PANGOLIN_EXPORT FfmpegVideo : public VideoInterface
{
public:
    FfmpegVideo(const std::string filename, const std::string fmtout = "RGB24", const std::string codec_hint = "", bool dump_info = false, int user_video_stream = -1, ImageDim size = ImageDim(0,0));
    ~FfmpegVideo();
    
    //! Implement VideoInput::Start()
    void Start();
    
    //! Implement VideoInput::Stop()
    void Stop();

    //! Implement VideoInput::SizeBytes()
    size_t SizeBytes() const;

    //! Implement VideoInput::Streams()
    const std::vector<StreamInfo>& Streams() const;
    
    //! Implement VideoInput::GrabNext()
    bool GrabNext( unsigned char* image, bool wait = true );
    
    //! Implement VideoInput::GrabNewest()
    bool GrabNewest( unsigned char* image, bool wait = true );
    
protected:
    void InitUrl(const std::string filename, const std::string fmtout = "RGB24", const std::string codec_hint = "", bool dump_info = false , int user_video_stream = -1, ImageDim size= ImageDim(0,0));
    
    std::vector<StreamInfo> streams;
    
    SwsContext      *img_convert_ctx;
    AVFormatContext *pFormatCtx;
    int             videoStream;
    int             audioStream;
    AVCodecContext  *pVidCodecCtx;
    AVCodecContext  *pAudCodecCtx;
    AVCodec         *pVidCodec;
    AVCodec         *pAudCodec;
    AVFrame         *pFrame;
    AVFrame         *pFrameOut;
    AVPacket        packet;
    int             numBytesOut;
    uint8_t         *buffer;
    AVPixelFormat     fmtout;
};

enum FfmpegMethod
{
    FFMPEG_FAST_BILINEAR =    1,
    FFMPEG_BILINEAR      =    2,
    FFMPEG_BICUBIC       =    4,
    FFMPEG_X             =    8,
    FFMPEG_POINT         = 0x10,
    FFMPEG_AREA          = 0x20,
    FFMPEG_BICUBLIN      = 0x40,
    FFMPEG_GAUSS         = 0x80,
    FFMPEG_SINC          =0x100,
    FFMPEG_LANCZOS       =0x200,
    FFMPEG_SPLINE        =0x400
};

class PANGOLIN_EXPORT FfmpegConverter : public VideoInterface
{
public:
    FfmpegConverter(std::unique_ptr<VideoInterface>& videoin, const std::string pixelfmtout = "RGB24", FfmpegMethod method = FFMPEG_POINT);
    ~FfmpegConverter();
    
    //! Implement VideoInput::Start()
    void Start();
    
    //! Implement VideoInput::Stop()
    void Stop();

    //! Implement VideoInput::SizeBytes()
    size_t SizeBytes() const;

    //! Implement VideoInput::Streams()
    const std::vector<StreamInfo>& Streams() const;
    
    //! Implement VideoInput::GrabNext()
    bool GrabNext( unsigned char* image, bool wait = true );
    
    //! Implement VideoInput::GrabNewest()
    bool GrabNewest( unsigned char* image, bool wait = true );
    
protected:
    std::vector<StreamInfo> streams;
    
    struct ConvertContext
    {
        SwsContext*     img_convert_ctx;
        AVPixelFormat   fmtsrc;
        AVPixelFormat   fmtdst;
        AVFrame*        avsrc;
        AVFrame*        avdst; 
        size_t          w,h;
        size_t          src_buffer_offset;
        size_t          dst_buffer_offset;
        
        void convert(const unsigned char * src, unsigned char* dst);
        
    };
    
    std::unique_ptr<VideoInterface> videoin;
    std::unique_ptr<unsigned char[]> input_buffer;

    std::vector<ConvertContext> converters;
    //size_t src_buffer_size;
    size_t dst_buffer_size;
};

#if (LIBAVFORMAT_VERSION_MAJOR > 55) || ((LIBAVFORMAT_VERSION_MAJOR == 55) && (LIBAVFORMAT_VERSION_MINOR >= 7))
typedef AVCodecID CodecID;
#endif

// Forward declaration
class FfmpegVideoOutputStream;

class PANGOLIN_EXPORT FfmpegVideoOutput
    : public VideoOutputInterface
{
    friend class FfmpegVideoOutputStream;
public:
    FfmpegVideoOutput( const std::string& filename, int base_frame_rate, int bit_rate, bool flip = false );
    ~FfmpegVideoOutput();

    const std::vector<StreamInfo>& Streams() const override;

    void SetStreams(const std::vector<StreamInfo>& streams, const std::string& uri, const picojson::value& properties) override;

    int WriteStreams(const unsigned char* data, const picojson::value& frame_properties) override;

    bool IsPipe() const override;
    
protected:
    void Initialise(std::string filename);
    void StartStream();
    void Close();
    
    std::string filename;
    bool started;
    AVFormatContext *oc;
    std::vector<FfmpegVideoOutputStream*> streams;
    std::vector<StreamInfo> strs;

    int frame_count;
    
    int base_frame_rate;
    int bit_rate;
    bool is_pipe;
    bool flip;
};

}