func (c *Caps) GetSize() int {
return int(C.gst_caps_get_size(c.g()))
}
// pad probe
func probe() {
pipeline := C.gst_pipeline_new(toGStr("pipeline"))
src, err := NewElement("videotestsrc", "src")
if err != nil {
log.Fatal(err)
}
filter, err := NewElement("capsfilter", "filter")
if err != nil {
log.Fatal(err)
}
csp, err := NewElement("videoconvert", "csp")
if err != nil {
log.Fatal(err)
}
sink, err := NewElement("xvimagesink", "sink")
if err != nil {
log.Fatal(err)
}
BinAdd(pipeline, src, filter, csp, sink)
ElementLink(src, filter, csp, sink)
C.gst_element_set_state(pipeline, C.GST_STATE_PLAYING)
messages := PipelineWatchBus(asGstPipeline(pipeline))
width, height := 640, 480
filtercaps := NewCapsSimple("video/x-raw",
"format", "RGB16",
"width", width,
"height", height,
"framerate", Fraction{25, 1})
ObjSet(asGObj(filter), "caps", filtercaps)
n := C.gst_caps_get_size(filtercaps)
structure := C.gst_caps_get_structure(filtercaps, n-1)
_ = structure
C.gst_caps_unref(filtercaps)
pad := C.gst_element_get_static_pad(src, toGStr("src"))
PadAddProbe(pad, C.GST_PAD_PROBE_TYPE_BUFFER, func(info *C.GstPadProbeInfo) C.GstPadProbeReturn {
buffer := (*C.GstBuffer)(unsafe.Pointer(info.data))
buffer = asGstBuffer(C.gst_mini_object_make_writable(asGstMiniObject(buffer)))
var mapInfo C.GstMapInfo
C.gst_buffer_map(buffer, &mapInfo, C.GST_MAP_WRITE)
var ptr []C.guint16
header := (*reflect.SliceHeader)(unsafe.Pointer(&ptr))
header.Len = int(mapInfo.size / 2)
header.Cap = header.Len
header.Data = uintptr(unsafe.Pointer(mapInfo.data))
for y := 0; y < height; y++ {
for x := 0; x < width/2; x++ {
ptr[x], ptr[width-1-x] = ptr[width-1-x], ptr[x]
}
ptr = ptr[width:]
}
C.gst_buffer_unmap(buffer, &mapInfo)
info.data = asGPtr(buffer)
return C.GST_PAD_PROBE_OK
})
C.gst_object_unref(asGPtr(pad))
go func() {
for msg := range messages {
MessageDump(msg)
}
}()
loop := C.g_main_loop_new(nil, False())
C.g_main_loop_run(loop)
}