mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
262 lines
9.8 KiB
Go
262 lines
9.8 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ofdgo
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"maps"
|
|
"mime"
|
|
"strings"
|
|
|
|
codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
|
|
"github.com/xiaoqidun/pdfgo"
|
|
)
|
|
|
|
// screenAnnotation 转换屏幕注解的音视频呈现，不忽略必须遵守的播放器约束
|
|
// 入参: ctx 取消上下文, page PDF页面, annotation 屏幕注解, strict 严格检查开关
|
|
// 返回: error 动作、媒体或外观错误
|
|
func (p *pdfImporter) screenAnnotation(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, strict bool) error {
|
|
if annotation.Dictionary["A"] == nil {
|
|
return p.appearanceAnnotation(ctx, page, annotation)
|
|
}
|
|
appearance := annotation
|
|
appearance.Dictionary = maps.Clone(annotation.Dictionary)
|
|
delete(appearance.Dictionary, "A")
|
|
additional, err := p.reader.Resolve(annotation.Dictionary["AA"])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if dict, ok := additional.(pdfgo.Dictionary); ok {
|
|
dict = maps.Clone(dict)
|
|
delete(dict, "U")
|
|
appearance.Dictionary["AA"] = dict
|
|
}
|
|
if appearance.Dictionary["AP"] == nil {
|
|
appearance.Dictionary["AP"] = pdfgo.Dictionary{"N": &pdfgo.Stream{Dictionary: pdfgo.Dictionary{
|
|
"Type": pdfgo.Name("XObject"), "Subtype": pdfgo.Name("Form"), "BBox": pdfgo.Array{pdfgo.Integer(0), pdfgo.Integer(0), pdfgo.Integer(1), pdfgo.Integer(1)},
|
|
}}}
|
|
}
|
|
flags, err := p.reader.ReadAnnotationFlags(annotation)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if flags&64 != 0 {
|
|
return p.appearanceAnnotation(ctx, page, appearance)
|
|
}
|
|
var actions []Action
|
|
currentPage := p.page
|
|
if err := p.reader.WalkActions(ctx, annotation.Dictionary["A"], func(info pdfgo.ActionInfo) error {
|
|
current := annotation
|
|
current.Dictionary = pdfgo.Dictionary{"A": info.Dictionary}
|
|
converted, err := p.linkActions(current, strict, ¤tPage)
|
|
actions = append(actions, converted...)
|
|
return err
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
return p.appearanceAnnotation(ctx, page, appearance, actions...)
|
|
}
|
|
|
|
// renditionLinkActions 按屏幕关联转换播放及控制，切换视频时先停止其他候选
|
|
// 入参: object PDF媒体动作, source 触发注解，零值表示非图元动作, strict 是否禁止语义损失, currentPage 动作链当前页
|
|
// 返回: []Action 有序OFD动作，无法转换时为空, error 参数、资源或严格模式错误
|
|
func (p *pdfImporter) renditionLinkActions(object pdfgo.Object, source pdfgo.Annotation, strict bool, currentPage int) ([]Action, error) {
|
|
playback, err := p.reader.ReadRenditionPlayback(p.ctx, object)
|
|
if err != nil {
|
|
if !strict && errors.Is(err, pdfgo.ErrInvalidAction) {
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("invalid PDF rendition action ignored: %v", err)})
|
|
return nil, nil
|
|
}
|
|
return nil, err
|
|
}
|
|
if playback.Operation == nil || *playback.Operation < 0 || *playback.Operation >= 4 {
|
|
return nil, p.renditionActionLoss("conditional rendition playback or script", strict)
|
|
}
|
|
if _, ok := p.pages[playback.Page]; !ok {
|
|
return nil, p.renditionActionLoss("screen page is outside the document", strict)
|
|
}
|
|
if *playback.Operation != 0 {
|
|
return p.renditionControls(playback.Annotation.Reference, *playback.Operation, "", strict)
|
|
}
|
|
selected, err := playback.Rendition.Select(p.ctx, func(candidate *pdfgo.Rendition) (bool, error) {
|
|
_, _, viable, err := p.nativeRendition(candidate)
|
|
return viable, err
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if selected == nil {
|
|
return nil, p.renditionActionLoss("no equivalent media rendition", strict)
|
|
}
|
|
converted, kind, _, err := p.nativeRendition(selected)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if kind == "Video" {
|
|
parameters, _, err := codecpdf.RenditionParameters(p.reader, selected.Screen, map[pdfgo.Name]func(pdfgo.Object) bool{
|
|
"W": func(value pdfgo.Object) bool { return value == pdfgo.Integer(0) || value == pdfgo.Integer(3) },
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
window := pdfgo.Integer(3)
|
|
if value, ok := parameters["W"].(pdfgo.Integer); ok {
|
|
window = value
|
|
}
|
|
matches := window == 0 && source.Subtype == ""
|
|
if window == 3 && source.Subtype != "" {
|
|
index := p.pageIndexes[playback.Page]
|
|
matches = currentPage == index && p.page == index
|
|
if matches {
|
|
if err := p.moviePlaybackBounds(converted.Movie, source, playback.Annotation, currentPage, strict); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
if !matches {
|
|
if err := p.renditionActionLoss("media playback window differs in OFD", strict); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
id, err := p.renditionResource(selected, kind, playback)
|
|
if err != nil || id == "" {
|
|
return nil, err
|
|
}
|
|
controls, err := p.renditionControls(playback.Annotation.Reference, 1, id, strict)
|
|
if err != nil || controls == nil {
|
|
return nil, err
|
|
}
|
|
if kind == "Audio" {
|
|
converted.Sound.ResourceID = id
|
|
} else {
|
|
converted.Movie.ResourceID = id
|
|
}
|
|
if len(selected.Play) != 0 || len(selected.Screen) != 0 || len(selected.Clip.BestEffort) != 0 {
|
|
p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF media rendition converted; best-effort presentation preferences may differ in OFD"})
|
|
}
|
|
return append(controls, converted), nil
|
|
}
|
|
|
|
// renditionResource 注册所选媒体，按屏幕区分播放实例并共用原始文件
|
|
// 入参: selected 已选择的原生呈现, kind 媒体类型, playback 播放目标
|
|
// 返回: string 资源标识，不可用时为空, error 文件或资源错误
|
|
func (p *pdfImporter) renditionResource(selected *pdfgo.Rendition, kind string, playback pdfgo.RenditionPlayback) (string, error) {
|
|
format := codecpdf.MediaFormat(*selected.Clip.File)
|
|
if format == "" {
|
|
mediaType, _, _ := mime.ParseMediaType(selected.Clip.ContentType)
|
|
format = strings.TrimPrefix(strings.SplitN(mediaType, "/", 2)[1], "x-")
|
|
}
|
|
id, err := p.mediaResource(p.ctx, *selected.Clip.File, kind, format, false)
|
|
if err != nil || id == "" {
|
|
return "", err
|
|
}
|
|
return p.mediaInstance(id, playback.Annotation, p.pageIndexes[playback.Page])
|
|
}
|
|
|
|
// renditionActionLoss 按导入策略报告媒体控制或呈现差异，不执行脚本
|
|
// 入参: reason 无法等价转换的原因, strict 是否禁止语义损失
|
|
// 返回: error 严格模式错误
|
|
func (p *pdfImporter) renditionActionLoss(reason string, strict bool) error {
|
|
if strict {
|
|
return &pdfgo.UnsupportedError{Feature: reason}
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Message: "PDF rendition action: " + reason})
|
|
return nil
|
|
}
|
|
|
|
// nativeRendition 检查可等价转换的媒体分支，视频不接受无法表达的音量及循环
|
|
// 入参: rendition 媒体呈现或选择器
|
|
// 返回: Action 播放动作, string 媒体类别, bool 是否可用, error 参数错误
|
|
func (p *pdfImporter) nativeRendition(rendition *pdfgo.Rendition) (Action, string, bool, error) {
|
|
result := Action{Event: "CLICK"}
|
|
viable, err := codecpdf.RenditionCriteria(p.reader, rendition)
|
|
if err != nil || !viable {
|
|
return result, "", false, err
|
|
}
|
|
if rendition.Subtype == "SR" {
|
|
return result, "", true, nil
|
|
}
|
|
clip := rendition.Clip
|
|
if clip == nil || clip.Subtype != "MCD" || clip.File == nil || len(clip.MustHonor) != 0 || len(clip.Players) != 0 {
|
|
return result, "", false, nil
|
|
}
|
|
if clip.File.Embedded == nil && p.resolveFile == nil {
|
|
return result, "", false, nil
|
|
}
|
|
for key, object := range clip.Permissions {
|
|
value, err := p.reader.Resolve(object)
|
|
if err != nil {
|
|
return result, "", false, err
|
|
}
|
|
if key == "Type" && value == pdfgo.Name("MediaPermissions") {
|
|
continue
|
|
}
|
|
if key != "TF" {
|
|
return result, "", false, nil
|
|
}
|
|
if _, ok := value.(pdfgo.String); !ok {
|
|
return result, "", false, fmt.Errorf("invalid media temporary-file permission")
|
|
}
|
|
}
|
|
mediaType, _, err := mime.ParseMediaType(clip.ContentType)
|
|
if err != nil || !strings.HasPrefix(mediaType, "audio/") && !strings.HasPrefix(mediaType, "video/") {
|
|
return result, "", false, nil
|
|
}
|
|
audio := strings.HasPrefix(mediaType, "audio/")
|
|
play, viable, err := codecpdf.RenditionParameters(p.reader, rendition.Play, map[pdfgo.Name]func(pdfgo.Object) bool{
|
|
"V": func(value pdfgo.Object) bool {
|
|
number, ok := value.(pdfgo.Integer)
|
|
return ok && number >= 0 && number <= 100 && (audio || number == 100)
|
|
},
|
|
"RC": func(value pdfgo.Object) bool {
|
|
return value == pdfgo.Integer(1) || value == pdfgo.Real(1) || audio && (value == pdfgo.Integer(0) || value == pdfgo.Real(0))
|
|
},
|
|
"A": func(value pdfgo.Object) bool { return value == pdfgo.Boolean(true) },
|
|
"F": func(value pdfgo.Object) bool { return value == pdfgo.Integer(0) || value == pdfgo.Integer(5) },
|
|
})
|
|
if err != nil || !viable {
|
|
return result, "", false, err
|
|
}
|
|
screen, viable, err := codecpdf.RenditionParameters(p.reader, rendition.Screen, map[pdfgo.Name]func(pdfgo.Object) bool{
|
|
"W": func(value pdfgo.Object) bool { return !audio && value == pdfgo.Integer(0) || value == pdfgo.Integer(3) },
|
|
})
|
|
if err != nil || !viable {
|
|
return result, "", false, err
|
|
}
|
|
if screen["W"] == pdfgo.Integer(0) {
|
|
valid, err := codecpdf.RenditionFloatingWindow(p.reader, rendition.Screen)
|
|
if err != nil || !valid {
|
|
return result, "", false, err
|
|
}
|
|
}
|
|
volume := 100
|
|
if value := play["V"]; value != nil {
|
|
volume = int(value.(pdfgo.Integer))
|
|
}
|
|
repeat := false
|
|
if value := play["RC"]; value != nil && value != pdfgo.Integer(1) && value != pdfgo.Real(1) {
|
|
repeat = true
|
|
}
|
|
if audio {
|
|
result.Sound = &Sound{Volume: &volume, Repeat: repeat}
|
|
return result, "Audio", true, nil
|
|
}
|
|
result.Movie = &Movie{Operator: "Play"}
|
|
return result, "Video", true, nil
|
|
}
|