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74 lines
2.2 KiB
Go
74 lines
2.2 KiB
Go
package video
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/*
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#include <gst/video/video.h>
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extern void goVideoGDestroyNotifyFunc (gpointer user_data);
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extern void goVideoConvertSampleCb (GstSample * sample, GError * gerr, gpointer user_data);
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void cgoVideoGDestroyNotifyFunc (gpointer user_data)
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{
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goVideoGDestroyNotifyFunc(user_data);
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}
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void cgoVideoConvertSampleCb (GstSample * sample, GError * gerr, gpointer user_data)
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{
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goVideoConvertSampleCb(sample, gerr, user_data);
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}
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*/
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import "C"
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import (
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"time"
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"unsafe"
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gopointer "github.com/mattn/go-pointer"
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"github.com/tinyzimmer/go-gst/gst"
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)
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// ConvertSampleCallback represents a callback from a video convert opereration.
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// It contains the converted sample or any error that ocurred.
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type ConvertSampleCallback func(*gst.Sample, error)
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// ConvertSample converts a raw video buffer into the specified output caps.
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//
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// The output caps can be any raw video formats or any image formats (jpeg, png, ...).
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//
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// The width, height and pixel-aspect-ratio can also be specified in the output caps.
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func ConvertSample(sample *gst.Sample, toCaps *gst.Caps, timeout time.Duration) (*gst.Sample, error) {
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var gerr *C.GError
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ret := C.gst_video_convert_sample(
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fromCoreSample(sample),
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fromCoreCaps(toCaps),
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durationToClockTime(timeout),
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&gerr,
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)
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if gerr != nil {
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return nil, wrapGerr(gerr)
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}
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if ret == nil {
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return nil, nil
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}
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return gst.FromGstSampleUnsafeFull(unsafe.Pointer(ret)), nil
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}
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// ConvertSampleAsync converts a raw video buffer into the specified output caps.
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//
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// The output caps can be any raw video formats or any image formats (jpeg, png, ...).
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//
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// The width, height and pixel-aspect-ratio can also be specified in the output caps.
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//
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// The callback will be called after conversion, when an error occurred or if conversion
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// didn't finish after timeout.
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func ConvertSampleAsync(sample *gst.Sample, toCaps *gst.Caps, timeout time.Duration, cb ConvertSampleCallback) {
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ptr := gopointer.Save(cb)
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C.gst_video_convert_sample_async(
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fromCoreSample(sample),
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fromCoreCaps(toCaps),
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durationToClockTime(timeout),
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C.GstVideoConvertSampleCallback(C.cgoVideoConvertSampleCb),
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(C.gpointer)(unsafe.Pointer(ptr)),
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C.GDestroyNotify(C.cgoVideoGDestroyNotifyFunc),
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)
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}
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