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101 lines
2.5 KiB
Go
101 lines
2.5 KiB
Go
// Copyright 2017 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 oto offers io.Writer to play sound on multiple platforms.
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package oto
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import (
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"io"
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"runtime"
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)
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// Player is a PCM (pulse-code modulation) audio player.
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// Player implements io.WriteCloser.
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// Use Write method to play samples.
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type Player struct {
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context *Context
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r *io.PipeReader
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w *io.PipeWriter
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}
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func newPlayer(context *Context) *Player {
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r, w := io.Pipe()
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p := &Player{
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context: context,
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r: r,
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w: w,
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}
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runtime.SetFinalizer(p, (*Player).Close)
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return p
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}
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// Write writes PCM samples to the Player.
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//
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// The format is as follows:
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// [data] = [sample 1] [sample 2] [sample 3] ...
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// [sample *] = [channel 1] ...
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// [channel *] = [byte 1] [byte 2] ...
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// Byte ordering is little endian.
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//
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// The data is first put into the Player's buffer. Once the buffer is full, Player starts playing
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// the data and empties the buffer.
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//
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// If the supplied data doesn't fit into the Player's buffer, Write block until a sufficient amount
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// of data has been played (or at least started playing) and the remaining unplayed data fits into
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// the buffer.
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//
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// Note, that the Player won't start playing anything until the buffer is full.
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func (p *Player) Write(buf []byte) (int, error) {
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return p.w.Write(buf)
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}
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// Close closes the Player and frees any resources associated with it. The Player is no longer
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// usable after calling Close.
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func (p *Player) Close() error {
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runtime.SetFinalizer(p, nil)
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// Already closed
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if p.context == nil {
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return nil
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}
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// Close the pipe writer before RemoveSource, or Read-ing in the mux takes forever.
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if err := p.w.Close(); err != nil {
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return err
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}
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p.context.mux.RemoveSource(p.r)
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p.context = nil
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// Close the pipe reader after RemoveSource, or ErrClosedPipe happens at Read-ing.
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if err := p.r.Close(); err != nil {
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return err
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}
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return nil
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}
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func max(a, b int) int {
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if a < b {
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return b
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}
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return a
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}
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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