doxygen/videobuffers_8h_source.html

#ifndef VIDEOBUFFERS_H

#define VIDEOBUFFERS_H


// Std

#include <vector>

#include <map>


// Qt

#include <QSize>

#if QT_VERSION < QT_VERSION_CHECK(5,14,0)

#include <QMutex>

#else

#include <QRecursiveMutex>

#endif

#include <QString>


// MythTV

#include "libmythbase/mythdeque.h"

#include "libmythtv/mythtvexp.h"

#include "libmythtv/mythframe.h"

#include "libmythtv/mythcodecid.h"


using frame_queue_t  = MythDeque<MythVideoFrame*> ;

using frame_vector_t = std::vector<MythVideoFrame>;

using vbuffer_map_t  = std::map<const MythVideoFrame*, uint>;


const QString& DebugString(const MythVideoFrame *Frame, bool Short = false);

const QString& DebugString(uint  FrameNum, bool Short = false);


enum BufferType

{

    kVideoBuffer_avail     = 0x00000001,

    kVideoBuffer_limbo     = 0x00000002,

    kVideoBuffer_used      = 0x00000004,

    kVideoBuffer_pause     = 0x00000008,

    kVideoBuffer_displayed = 0x00000010,

    kVideoBuffer_finished  = 0x00000020,

    kVideoBuffer_decode    = 0x00000040,

    kVideoBuffer_all       = 0x0000003F,

};


class MTV_PUBLIC VideoBuffers

{

  public:

    VideoBuffers() = default;

   ~VideoBuffers() = default;


    static uint GetNumBuffers(int PixelFormat, int MaxReferenceFrames = 16, bool Decoder = false);

    void Init(uint NumDecode,

              uint NeedFree, uint NeedprebufferNormal,

              uint NeedPrebufferSmall);

    bool CreateBuffers(VideoFrameType Type, const VideoFrameTypes* RenderFormats, QSize Size,

                       uint NeedFree, uint NeedprebufferNormal,

                       uint NeedPrebufferSmall, int MaxReferenceFrames = 16);

    bool CreateBuffers(VideoFrameType Type, int Width, int Height, const VideoFrameTypes* RenderFormats);

    static bool ReinitBuffer(MythVideoFrame *Frame, VideoFrameType Type, MythCodecID CodecID, int Width, int Height);

    void SetDeinterlacing(MythDeintType Single, MythDeintType Double, MythCodecID CodecID);


    void Reset(void);

    void DiscardFrames(bool NextFrameIsKeyFrame);

    void ClearAfterSeek(void);


    void SetPrebuffering(bool Normal);

    MythVideoFrame *GetNextFreeFrame(BufferType EnqueueTo = kVideoBuffer_limbo);

    void ReleaseFrame(MythVideoFrame *Frame);

    void DeLimboFrame(MythVideoFrame *Frame);

    void StartDisplayingFrame(void);

    void DoneDisplayingFrame(MythVideoFrame *Frame);

    void DiscardFrame(MythVideoFrame *Frame);

    void DiscardPauseFrames(void);

    bool DiscardAndRecreate(MythCodecID CodecID, QSize VideoDim, int References);


    MythVideoFrame *At(uint FrameNum);

    MythVideoFrame *Dequeue(BufferType Type);

    MythVideoFrame *Head(BufferType Type);

    MythVideoFrame *Tail(BufferType Type);

    void Enqueue(BufferType Type, MythVideoFrame* Frame);

    void SafeEnqueue(BufferType Type, MythVideoFrame* Frame);

    void Remove(BufferType Type, MythVideoFrame *Frame);

    frame_queue_t::iterator BeginLock(BufferType Type);

    frame_queue_t::iterator End(BufferType Type);

    void EndLock();

    uint Size(BufferType Type) const;

    bool Contains(BufferType Type, MythVideoFrame* Frame) const;

    MythVideoFrame *GetLastDecodedFrame(void);

    MythVideoFrame *GetLastShownFrame(void);


    uint ValidVideoFrames(void) const;

    uint FreeVideoFrames(void) const;

    bool EnoughFreeFrames(void) const;

    bool EnoughDecodedFrames(void) const;


    const MythVideoFrame *At(uint FrameNum) const;

    const MythVideoFrame *GetLastDecodedFrame(void) const;

    const MythVideoFrame *GetLastShownFrame(void) const;

    uint  Size(void) const;


    QString GetStatus(uint Num = 0) const;


  private:

    frame_queue_t       *Queue(BufferType Type);

    const frame_queue_t *Queue(BufferType Type) const;

    MythVideoFrame      *GetNextFreeFrameInternal(BufferType EnqueueTo);

    static void          SetDeinterlacingFlags(MythVideoFrame &Frame, MythDeintType Single,

                                               MythDeintType Double, MythCodecID CodecID);


    frame_queue_t        m_available;

    frame_queue_t        m_used;

    frame_queue_t        m_limbo;

    frame_queue_t        m_pause;

    frame_queue_t        m_displayed;

    frame_queue_t        m_decode;

    frame_queue_t        m_finished;

    vbuffer_map_t        m_vbufferMap;

    frame_vector_t       m_buffers;

    const VideoFrameTypes* m_renderFormats { nullptr };


    uint                 m_needFreeFrames            { 0 };

    uint                 m_needPrebufferFrames       { 0 };

    uint                 m_needPrebufferFramesNormal { 0 };

    uint                 m_needPrebufferFramesSmall  { 0 };

    uint                 m_rpos                      { 0 };

    uint                 m_vpos                      { 0 };

#if QT_VERSION < QT_VERSION_CHECK(5,14,0)

    mutable QMutex       m_globalLock                { QMutex::Recursive };

#else

    mutable QRecursiveMutex m_globalLock;

#endif

};


#endif // VIDEOBUFFERS_H