exportthread.h

#ifndef EXPORTTHREAD_H
#define EXPORTTHREAD_H

#include <QThread>
#include <QOffscreenSurface>
#include <QMutex>
#include <QWaitCondition>

class ExportDialog;
struct AVFormatContext;
struct AVCodecContext;
struct AVFrame;
struct AVPacket;
struct AVStream;
struct AVCodec;
struct SwsContext;
struct SwrContext;

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

#define COMPRESSION_TYPE_CBR 0
#define COMPRESSION_TYPE_CFR 1
#define COMPRESSION_TYPE_TARGETSIZE 2
#define COMPRESSION_TYPE_TARGETBR 3

// structs that store parameters passed from the export dialogs to this thread

struct ExportParams {
    // export parameters
    QString filename;
    bool video_enabled;
    int video_codec;
    int video_width;
    int video_height;
    double video_frame_rate;
    int video_compression_type;
    double video_bitrate;
    bool audio_enabled;
    int audio_codec;
    int audio_sampling_rate;
    int audio_bitrate;
    long start_frame;
    long end_frame;
};

struct VideoCodecParams {
    int pix_fmt;
};

class ExportThread : public QThread {
    Q_OBJECT
public:
    ExportThread(const ExportParams& iparams, const VideoCodecParams& ivparams, QObject* parent = nullptr);
    void run();

    QOffscreenSurface surface;

    ExportDialog* ed;

    bool continueEncode;
signals:
    void progress_changed(int value, qint64 remaining_ms);
public slots:
    void wake();
private:
    bool encode(AVFormatContext* ofmt_ctx, AVCodecContext* codec_ctx, AVFrame* frame, AVPacket* packet, AVStream* stream, bool rescale);
    bool setupVideo();
    bool setupAudio();
    bool setupContainer();

    // params imported from dialogs
    ExportParams params;
    VideoCodecParams vcodec_params;

    AVFormatContext* fmt_ctx;
    AVStream* video_stream;
    AVCodec* vcodec;
    AVCodecContext* vcodec_ctx;
    AVFrame* video_frame;
    AVFrame* sws_frame;
    SwsContext* sws_ctx;
    AVStream* audio_stream;
    AVCodec* acodec;
    AVFrame* audio_frame;
    AVFrame* swr_frame;
    AVCodecContext* acodec_ctx;
    AVPacket video_pkt;
    AVPacket audio_pkt;
    SwrContext* swr_ctx;

    bool vpkt_alloc;
    bool apkt_alloc;

    int aframe_bytes;
    int ret;
    char* c_filename;

    QMutex mutex;
    QWaitCondition waitCond;
};

#endif // EXPORTTHREAD_H