llmediaimplgstreamervidplug.h

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#ifndef __GST_SLVIDEO_H__
#define __GST_SLVIDEO_H__

#if LL_GSTREAMER_ENABLED

extern "C" {
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideosink.h>
}

G_BEGIN_DECLS

/* #defines don't like whitespacey bits */
#define GST_TYPE_SLVIDEO \
  (gst_slvideo_get_type())
#define GST_SLVIDEO(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SLVIDEO,GstSLVideo))
#define GST_SLVIDEO_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SLVIDEO,GstSLVideoClass))
#define GST_IS_SLVIDEO(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SLVIDEO))
#define GST_IS_SLVIDEO_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SLVIDEO))

typedef struct _GstSLVideo      GstSLVideo;
typedef struct _GstSLVideoClass GstSLVideoClass;

typedef enum {
        SLV_PF_UNKNOWN = 0,
        SLV_PF_RGBX    = 1,
        SLV_PF_BGRX    = 2,
        SLV__END       = 3
} SLVPixelFormat;
const int SLVPixelFormatBytes[SLV__END] = {1, 4, 4};

struct _GstSLVideo
{
        GstVideoSink video_sink;

        GstCaps *caps;

        int fps_n, fps_d;
        int par_n, par_d;
        int height, width;
        SLVPixelFormat format;

        // SHARED WITH APPLICATION:
        // Access to the following should be protected by GST_OBJECT_LOCK() on
        // the GstSLVideo object, and should be totally consistent upon UNLOCK
        // (i.e. all written at once to reflect the current retained frame info
        // when the retained frame is updated.)
        bool retained_frame_ready; // new frame ready since flag last reset. (*TODO: could get the writer to wait on a semaphore instead of having the reader poll, potentially making dropped frames somewhat cheaper.)
        U8*  retained_frame_data;
        int  retained_frame_allocbytes;
        int  retained_frame_width, retained_frame_height;
        SLVPixelFormat retained_frame_format;
};

struct _GstSLVideoClass 
{
        GstVideoSink parent_class;
};

GType gst_slvideo_get_type (void);

void gst_slvideo_init_class (void);

G_END_DECLS

#endif // LL_GSTREAMER_ENABLED

#endif /* __GST_SLVIDEO_H__ */

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