mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 14:31:12 +08:00
62 lines
1.9 KiB
Go
62 lines
1.9 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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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 ofdgo
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import (
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"context"
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"fmt"
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"github.com/xiaoqidun/pdfgo"
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)
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// soundAction 保留音量、循环及等待语义，PDF同步播放同时限制交互
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// 入参: action OFD音频动作
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// 返回: *pdfNavigationAction PDF音频动作, error 资源或参数错误
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func (n *pdfNavigation) soundAction(action Sound) (*pdfNavigationAction, error) {
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volume := 100
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if action.Volume != nil {
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volume = *action.Volume
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}
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if volume < 0 || volume > 100 {
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return nil, fmt.Errorf("invalid sound volume")
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}
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file := n.audio[action.ResourceID]
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if file == nil {
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media, err := n.source.Media(action.ResourceID)
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if err != nil {
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return nil, err
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}
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if media.Type != "Audio" {
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return nil, fmt.Errorf("sound resource is not audio: %s", action.ResourceID)
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}
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if n.audio == nil {
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n.audio = make(map[string]*pdfgo.FileSpecification)
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}
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file = n.mediaFile(media)
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n.audio[action.ResourceID] = file
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}
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return &pdfNavigationAction{Sound: &pdfgo.SoundAction{
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Sound: pdfgo.Sound{File: file}, Volume: float64(volume) / 100,
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Repeat: action.Repeat, Synchronous: action.Synchronous && !action.Repeat,
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}}, nil
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}
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// loadAudio 在绘制后读取自描述音频文件，原始内容不作采样转换
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// 入参: ctx 取消上下文
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// 返回: error 资源读取或取消错误
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func (n *pdfNavigation) loadAudio(ctx context.Context) error {
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return n.loadMediaFiles(ctx, n.audio)
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}
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