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// 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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"errors"
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"fmt"
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"github.com/xiaoqidun/pdfgo"
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)
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// movieResource 保存视频原始内容，按用途复用媒体或附件资源
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// 入参: ctx 取消上下文, file 文件说明, attachment 是否作为附件保存
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// 返回: string 媒体或附件标识，缺少外部资源时为空, error 读取、注册或取消错误
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func (p *pdfImporter) movieResource(ctx context.Context, file pdfgo.FileSpecification, attachment bool) (string, error) {
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return p.mediaResource(ctx, file, "Video", pdfMediaFormat(file), attachment)
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}
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// movieAnnotation 保留视频外观及可表示的播放动作，无法等价转换时按策略处理
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// 入参: ctx 取消上下文, page PDF页面, annotation 视频注解, strict 是否禁止语义损失
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// 返回: error 媒体、外观、播放参数或取消错误
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func (p *pdfImporter) movieAnnotation(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, strict bool) error {
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if err := ctx.Err(); err != nil {
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return err
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}
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movie, err := p.reader.ReadMovie(annotation.Dictionary["Movie"])
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if err != nil {
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return err
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}
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activation, err := p.reader.Resolve(annotation.Dictionary["A"])
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if err != nil {
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return err
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}
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if activation == pdfgo.Boolean(false) {
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return p.appearanceAnnotation(ctx, page, annotation)
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}
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if activation == pdfgo.Boolean(true) {
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activation = nil
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}
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parameters, err := p.reader.ReadMovieActivation(ctx, activation)
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if err != nil {
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return err
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}
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if !pdfMoviePlaybackSupported(movie, parameters) {
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if err := p.moviePlaybackLoss(ctx, movie.File, strict); err != nil {
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return err
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}
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return p.appearanceAnnotation(ctx, page, annotation)
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}
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if parameters.FloatingScale != nil {
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if err := p.movieActionLoss("movie playback window", strict, true); err != nil {
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return err
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}
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}
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id, err := p.movieResource(ctx, movie.File, false)
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if err != nil {
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return err
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}
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if id == "" {
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return p.appearanceAnnotation(ctx, page, annotation)
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}
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id, err = p.mediaInstance(id, annotation, p.page)
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if err != nil {
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return err
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}
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return p.appearanceAnnotation(ctx, page, annotation, Action{Event: "CLICK", Movie: &Movie{ResourceID: id, Operator: "Play"}})
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}
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// pdfMoviePlaybackSupported 判断OFD视频动作能否保持播放内容、声音及控制方式
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// 入参: movie 视频信息, parameters 播放参数
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// 返回: bool 是否可直接转换，不含播放窗口差异
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func pdfMoviePlaybackSupported(movie pdfgo.Movie, parameters pdfgo.MovieActivation) bool {
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return (parameters.Start == nil || parameters.Start.Value == 0) && parameters.Duration == nil && parameters.Rate == 1 && parameters.Volume == 1 && !parameters.ShowControls && !parameters.Synchronous && parameters.Mode == "Once" && movie.Rotate == 0
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}
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// movieLinkAction 转换当前页视频操作，不将指定播放区间或速度改为完整默认播放
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// 入参: object PDF视频动作, source 触发注解, strict 是否禁止语义损失, currentPage 动作链当前页
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// 返回: *Action OFD视频动作，不能安全转换时为空, error 参数、资源或严格模式错误
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func (p *pdfImporter) movieLinkAction(object pdfgo.Object, source pdfgo.Annotation, strict bool, currentPage int) (*Action, error) {
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if currentPage < 0 || currentPage >= len(p.pageOrder) {
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if _, err := p.reader.ReadMovieAction(p.ctx, object); err != nil {
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return nil, err
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}
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return nil, p.movieActionLoss("movie target without a fixed current page", strict, false)
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}
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playback, err := p.reader.ReadMoviePlayback(p.ctx, p.pageOrder[currentPage], object)
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if err != nil {
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if !strict && errors.Is(err, pdfgo.ErrInvalidAction) {
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p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("invalid PDF movie action ignored: %v", err)})
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return nil, nil
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}
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return nil, err
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}
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if playback.Operation == "Play" {
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parameters := playback.Activation
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if !pdfMoviePlaybackSupported(playback.Movie, parameters) {
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return nil, p.moviePlaybackLoss(p.ctx, playback.Movie.File, strict)
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}
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if parameters.FloatingScale != nil {
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if err := p.movieActionLoss("movie playback window", strict, true); err != nil {
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return nil, err
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}
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}
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}
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id, err := p.movieResource(p.ctx, playback.Movie.File, false)
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if err != nil || id == "" {
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return nil, err
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}
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id, err = p.mediaInstance(id, playback.Annotation, currentPage)
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if err != nil {
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return nil, err
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}
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action := &Action{Event: "CLICK", Movie: &Movie{ResourceID: id, Operator: string(playback.Operation)}}
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if playback.Operation == "Play" && playback.Activation.FloatingScale == nil {
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if err := p.moviePlaybackBounds(action.Movie, source, playback.Annotation, currentPage, strict); err != nil {
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return nil, err
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}
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}
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return action, nil
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}
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// moviePlaybackBounds 保存同页嵌入视频的播放区域，不改变触发注解的点击区域
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// 入参: movie OFD视频动作, source 触发注解, target 播放注解, currentPage 当前页, strict 是否禁止语义损失
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// 返回: error 播放区域、标志或严格模式错误
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func (p *pdfImporter) moviePlaybackBounds(movie *Movie, source, target pdfgo.Annotation, currentPage int, strict bool) error {
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if source.Subtype == "" || currentPage != p.page {
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return p.movieActionLoss("movie playback window", strict, true)
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}
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if source.Rect == target.Rect {
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return nil
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}
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flags, err := p.reader.ReadAnnotationFlags(target)
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if err != nil {
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return err
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}
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if flags&(8|16) != 0 {
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return p.movieActionLoss("movie playback window scaling", strict, true)
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}
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box := pdfBounds([]pdfgo.Point{
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p.matrix.Apply(pdfgo.Point{X: target.Rect.XMin, Y: target.Rect.YMin}),
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p.matrix.Apply(pdfgo.Point{X: target.Rect.XMax, Y: target.Rect.YMin}),
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p.matrix.Apply(pdfgo.Point{X: target.Rect.XMax, Y: target.Rect.YMax}),
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p.matrix.Apply(pdfgo.Point{X: target.Rect.XMin, Y: target.Rect.YMax}),
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})
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if box.W <= 0 || box.H <= 0 {
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return p.movieActionLoss("empty movie playback window", strict, true)
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}
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if p.movieBounds == nil {
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p.movieBounds = make(map[*Movie]Box)
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}
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p.movieBounds[movie] = box
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return nil
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}
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// annotationMovieBounds 校验同一动作链的播放区域，保持单一图元上的动作顺序
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// 入参: actions 注解动作, source 触发区域, flags 触发注解标志
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// 返回: Box 播放区域, error 无法等价转换的窗口要求
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func (p *pdfImporter) annotationMovieBounds(actions []Action, source Box, flags int64) (Box, error) {
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playback, found := source, false
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for _, action := range actions {
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if action.Movie == nil || action.Movie.Operator != "" && action.Movie.Operator != "Play" {
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continue
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}
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box, ok := p.movieBounds[action.Movie]
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if !ok {
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box = source
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}
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if found && playback != box || box != source && flags&(8|16) != 0 {
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return source, p.movieActionLoss("multiple or fixed-scale movie playback windows", p.warning == nil, true)
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}
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playback, found = box, true
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}
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return playback, nil
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}
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// moviePlaybackLoss 保留不可等价转换的视频文件，不生成改变播放内容的动作
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// 入参: ctx 取消上下文, file 视频文件说明, strict 是否禁止语义损失
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// 返回: error 严格模式、资源读取或取消错误
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func (p *pdfImporter) moviePlaybackLoss(ctx context.Context, file pdfgo.FileSpecification, strict bool) error {
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if strict {
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return &pdfgo.UnsupportedError{Feature: "movie playback parameters conversion"}
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}
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id, err := p.movieResource(ctx, file, true)
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if err != nil {
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return err
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}
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message := "PDF movie playback parameters not transferred to OFD; action omitted"
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if id != "" {
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message += "; original media retained as attachment"
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}
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p.warning(pdfgo.Diagnostic{Page: p.page + 1, Message: message})
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return nil
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}
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// movieActionLoss 按策略报告OFD无法表达的视频参数，不自行添加扩展属性
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// 入参: feature 差异内容, strict 严格模式, retained 是否保留视频操作
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// 返回: error 严格模式下的不可等价转换错误
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func (p *pdfImporter) movieActionLoss(feature string, strict, retained bool) error {
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if strict {
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return &pdfgo.UnsupportedError{Feature: feature + " conversion"}
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}
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suffix := "; action omitted"
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if retained {
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suffix = "; video operation retained"
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}
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p.warning(pdfgo.Diagnostic{Message: "PDF " + feature + " not transferred to OFD" + suffix})
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return nil
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}
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