mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 11:48:55 +01:00
127 lines
3.1 KiB
Go
127 lines
3.1 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package audio
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// #cgo LDFLAGS: -lwinmm
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//
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// #include <windows.h>
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// #include <mmsystem.h>
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//
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// #define sizeOfWavehdr (sizeof(WAVEHDR))
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//
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// MMRESULT waveOutOpen2(HWAVEOUT* waveOut, WAVEFORMATEX* format);
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import "C"
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import (
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"fmt"
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"io"
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"time"
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"unsafe"
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)
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type header struct {
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buffer unsafe.Pointer
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bufferSize int
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waveHdr C.WAVEHDR
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}
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// TODO: Reduce panics and use errors instead
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func newHeader(waveOut C.HWAVEOUT, bufferSize int) header {
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// NOTE: This is never freed so far.
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buf := C.malloc(C.size_t(bufferSize))
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h := header{
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buffer: buf,
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bufferSize: bufferSize,
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waveHdr: C.WAVEHDR{
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lpData: C.LPSTR(buf),
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dwBufferLength: C.DWORD(bufferSize),
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},
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}
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// TODO: Need to unprepare to avoid memory leak?
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if err := C.waveOutPrepareHeader(waveOut, &h.waveHdr, C.sizeOfWavehdr); err != C.MMSYSERR_NOERROR {
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panic(fmt.Sprintf("audio: waveOutPrepareHeader error %d", err))
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}
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return h
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}
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func (h *header) Write(waveOut C.HWAVEOUT, data []byte) {
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if len(data) != h.bufferSize {
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panic("audio: len(data) must equal to h.bufferSize")
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}
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C.memcpy(h.buffer, unsafe.Pointer(&data[0]), C.size_t(h.bufferSize))
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if err := C.waveOutWrite(waveOut, &h.waveHdr, C.sizeOfWavehdr); err != C.MMSYSERR_NOERROR {
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panic(fmt.Sprintf("audio: waveOutWriter error %d", err))
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}
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}
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const numHeader = 8
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var sem = make(chan struct{}, numHeader)
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//export releaseSemaphore
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func releaseSemaphore() {
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<-sem
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}
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func startPlaying(src io.Reader, sampleRate int) error {
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const numBlockAlign = channelNum * bitsPerSample / 8
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f := C.WAVEFORMATEX{
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wFormatTag: C.WAVE_FORMAT_PCM,
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nChannels: channelNum,
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nSamplesPerSec: C.DWORD(sampleRate),
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nAvgBytesPerSec: C.DWORD(sampleRate) * numBlockAlign,
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wBitsPerSample: bitsPerSample,
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nBlockAlign: numBlockAlign,
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}
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var w C.HWAVEOUT
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if err := C.waveOutOpen2(&w, &f); err != C.MMSYSERR_NOERROR {
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return fmt.Errorf("audio: waveOutOpen error: %d", err)
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}
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go func() {
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const bufferSize = 1024
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b := []byte{}
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bb := make([]byte, bufferSize)
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headers := make([]header, numHeader)
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for i := 0; i < numHeader; i++ {
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headers[i] = newHeader(w, bufferSize)
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}
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i := 0
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for {
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n, err := src.Read(bb)
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if 0 < n {
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b = append(b, bb[:n]...)
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for bufferSize <= len(b) {
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sem <- struct{}{}
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headers[i].Write(w, b[:bufferSize])
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b = b[bufferSize:]
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i++
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i %= len(headers)
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}
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}
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if err == io.EOF {
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break
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}
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if err != nil {
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// TODO: Propagate this error?
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panic(err)
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}
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time.Sleep(1 * time.Millisecond)
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}
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// TODO: Finalize the wave handler
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}()
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return nil
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}
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