mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-14 23:17:27 +01:00
136 lines
3.4 KiB
Go
136 lines
3.4 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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// +build !js
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package driver
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// TODO: Use golang.org/x/sys/windows (NewLazyDLL) instead of cgo.
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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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import "C"
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import (
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"errors"
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"fmt"
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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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func newHeader(waveOut C.HWAVEOUT, bufferSize int) (*header, error) {
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// NOTE: This is never freed so far, and we don't have to because newHeader is called a certain number of times.
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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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if err := C.waveOutPrepareHeader(waveOut, &h.waveHdr, C.sizeOfWavehdr); err != C.MMSYSERR_NOERROR {
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return nil, fmt.Errorf("driver: waveOutPrepareHeader error: %d", err)
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}
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return h, nil
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}
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func (h *header) Write(waveOut C.HWAVEOUT, data []byte) error {
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if len(data) != h.bufferSize {
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return errors.New("driver: 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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return fmt.Errorf("driver: waveOutWriter error: %d", err)
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}
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return nil
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}
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const numHeader = 8
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type Player struct {
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out C.HWAVEOUT
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buffer []byte
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headers []*header
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}
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const bufferSize = 4096
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func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
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numBlockAlign := channelNum * bytesPerSample
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f := C.WAVEFORMATEX{
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wFormatTag: C.WAVE_FORMAT_PCM,
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nChannels: C.WORD(channelNum),
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nSamplesPerSec: C.DWORD(sampleRate),
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nAvgBytesPerSec: C.DWORD(sampleRate * numBlockAlign),
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wBitsPerSample: C.WORD(bytesPerSample * 8),
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nBlockAlign: C.WORD(numBlockAlign),
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}
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var w C.HWAVEOUT
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if err := C.waveOutOpen(&w, C.WAVE_MAPPER, &f, 0, 0, C.CALLBACK_NULL); err != C.MMSYSERR_NOERROR {
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return nil, fmt.Errorf("driver: waveOutOpen error: %d", err)
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}
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p := &Player{
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out: w,
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buffer: []byte{},
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headers: make([]*header, numHeader),
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}
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for i := 0; i < numHeader; i++ {
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var err error
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p.headers[i], err = newHeader(w, bufferSize)
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if err != nil {
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return nil, err
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}
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}
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return p, nil
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}
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func (p *Player) Proceed(data []byte) error {
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p.buffer = append(p.buffer, data...)
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if bufferSize > len(p.buffer) {
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return nil
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}
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headerToWrite := (*header)(nil)
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for _, h := range p.headers {
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// TODO: Need to check WHDR_DONE?
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if h.waveHdr.dwFlags&C.WHDR_INQUEUE == 0 {
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headerToWrite = h
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break
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}
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}
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if headerToWrite == nil {
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// This can happen (#207)
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return nil
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}
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if err := headerToWrite.Write(p.out, p.buffer[:bufferSize]); err != nil {
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return err
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}
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p.buffer = p.buffer[bufferSize:]
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return nil
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}
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func (p *Player) Close() error {
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// TODO: Implement this
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return nil
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}
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