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feat(ffmpeg): speed optimization and export memory buffer

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Adrian Shum 2022-09-13 21:15:16 +08:00 • committed by GitHub
parent 3a5e26f37c
commit ce911eaf8a
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 28 additions and 53 deletions
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26
ffmpeg/ffmpeg.go
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@ -80,11 +80,8 @@ func LoadAVContext(ctx context.Context, reader io.Reader, size int64) (*AVContex
return av, nil
}
func (av *AVContext) ExportImage() ([]byte, error) {
if !av.hasFrame {
return nil, nil
}
return encodeFrameImage(av)
func (av *AVContext) Export() (buf []byte, err error) {
return exportBuffer(av)
}
func (av *AVContext) Close() {
@ -279,15 +276,16 @@ func convertFrameToRGB(av *AVContext) error {
return nil
}
func encodeFrameImage(av *AVContext) ([]byte, error) {
pkt := C.create_packet()
err := C.encode_frame_to_image(av.formatContext, av.frame, &pkt)
if err < 0 {
return nil, avError(err)
func exportBuffer(av *AVContext) ([]byte, error) {
if !av.hasFrame {
return nil, ErrDecoderNotFound
}
p := C.GoBytes(unsafe.Pointer(pkt.data), pkt.size)
if pkt.buf != nil {
C.av_packet_unref(&pkt)
size := av.height * av.width
if av.hasAlpha {
size *= 4
} else {
size *= 3
}
return p, nil
buf := C.GoBytes(unsafe.Pointer(av.frame.data[0]), C.int(size))
return buf, nil
}