//export Go_callback
func Go_callback(playerInfo unsafe.Pointer, queue C.AudioQueueRef, buffer C.AudioQueueBufferRef) {
audioData := ((*[1 << 30]byte)(unsafe.Pointer((*buffer).mAudioData)))[:buffer.mAudioDataBytesCapacity]
pktDescs := (*[1 << 30]C.AudioStreamPacketDescription)(unsafe.Pointer(buffer.mPacketDescriptions))
npackets := 0
upto := audioData
if peeked != nil {
copy(upto, peeked)
pktDescs[npackets].mStartOffset = C.SInt64(int64(len(audioData) - len(upto)))
pktDescs[npackets].mDataByteSize = C.UInt32(int32(len(peeked)))
upto = upto[len(peeked):]
npackets++
}
peeked = <-packetsin
for len(peeked) <= len(upto) {
copy(upto, peeked)
pktDescs[npackets].mStartOffset = C.SInt64(int64(len(audioData) - len(upto)))
pktDescs[npackets].mDataByteSize = C.UInt32(int32(len(peeked)))
pktDescs[npackets].mVariableFramesInPacket = C.UInt32(int32(0))
upto = upto[len(peeked):]
npackets++
peeked = <-packetsin
}
buffer.mAudioDataByteSize = C.UInt32(len(audioData) - len(upto))
buffer.mPacketDescriptionCount = C.UInt32(npackets)
C.AudioQueueEnqueueBuffer(queue, buffer, 0, (*C.AudioStreamPacketDescription)(nil))
}
// there is no uint64 CFNumber type, so we have to use the SInt64 one
func convertUInt32ToCFNumber(u uint32) C.CFNumberRef {
sint := C.SInt64(u)
return C.CFNumberCreate(nil, C.kCFNumberSInt64Type, unsafe.Pointer(&sint))
}
// ===== CFNumber =====
// for simplicity's sake, only include the largest of any given numeric datatype
func convertInt64ToCFNumber(i int64) C.CFNumberRef {
sint := C.SInt64(i)
return C.CFNumberCreate(nil, C.kCFNumberSInt64Type, unsafe.Pointer(&sint))
}
//export go_audiofile_getsizeproc
func go_audiofile_getsizeproc(data unsafe.Pointer) C.SInt64 {
af := (*AudioFile)(data)
return C.SInt64(af.fileSize)
}