267 lines
8.3 KiB
Go
267 lines
8.3 KiB
Go
package app
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import (
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"context"
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"errors"
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"fmt"
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"math"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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type playbackSegmentIndex struct {
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Name string
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Start float64
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Duration float64
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}
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type playbackGenerated struct {
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ctx context.Context
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cancel context.CancelFunc
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directory string
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base string
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query string
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playlist string
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segments []playbackSegmentIndex
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files map[string]bool
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bytes int64
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resources *playbackResources
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done chan struct{}
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once sync.Once
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mu sync.RWMutex
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}
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func playbackGeneratedArgs(media providerMedia, input, directory, processing string) []string {
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args := playbackInputArgs(media, input, 0)
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if processing == "audio" {
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args = append(args, "-c:v", "copy", "-c:a", "aac", "-b:a", "128k", "-ar", "48000", "-ac", "2")
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} else {
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args = append(args, "-c", "copy")
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}
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return append(args, "-avoid_negative_ts", "make_zero", "-f", "hls", "-hls_time", "2", "-hls_list_size", "0",
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"-hls_playlist_type", "vod", "-hls_segment_type", "fmp4", "-hls_fmp4_init_filename", "init.mp4",
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"-hls_flags", "temp_file", "-hls_segment_filename", filepath.ToSlash(filepath.Join(directory, "%06d.m4s")), filepath.ToSlash(filepath.Join(directory, "index.m3u8")))
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}
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func (app *UIApp) generatePlayback(ctx context.Context, media *playbackMediaSession, processing, base, query string) error {
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ffmpeg, err := app.downloader.ensureFFmpeg(ctx)
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if err != nil {
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return err
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}
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release, err := app.mediaResources().acquire(ctx, processing, false)
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if err != nil {
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return err
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}
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defer release()
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directory, err := os.MkdirTemp("", "juku-playback-media-")
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if err != nil {
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return err
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}
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jobCtx, cancel := context.WithCancel(media.ctx)
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stop := context.AfterFunc(ctx, cancel)
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defer stop()
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generated := &playbackGenerated{ctx: jobCtx, cancel: cancel, directory: directory, base: base, query: query,
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resources: app.mediaResources(), done: make(chan struct{}), files: make(map[string]bool)}
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media.generated = generated
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defer close(generated.done)
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input := media.local
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var proxy *hlsProxy
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if input == "" {
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proxy, err = app.downloader.newHLSProxy(jobCtx, media.media, media.key)
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if err != nil {
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return err
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}
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defer proxy.Close()
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proxy.acquire = func(ctx context.Context) (func(), error) { return app.mediaResources().acquire(ctx, "media", false) }
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input = proxy.root
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}
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command := ffmpegMediaCommand(jobCtx, ffmpeg, playbackGeneratedArgs(media.media, input, directory, processing)...)
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log := &playbackLog{text: cappedStringWriter{limit: 64 * 1024}, ready: make(chan struct{})}
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command.Stderr = log
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if err := command.Start(); err != nil {
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return fmt.Errorf("无法启动媒体封装：%w", err)
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}
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done := make(chan error, 1)
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go func() { done <- command.Wait() }()
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ticker := time.NewTicker(50 * time.Millisecond)
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defer ticker.Stop()
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for {
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select {
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case err := <-done:
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if err != nil {
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return playbackStreamError(jobCtx, proxy, log, media.media, err, nil)
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}
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if err = generated.accountCache(); err != nil {
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return err
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}
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body, err := os.ReadFile(filepath.Join(directory, "index.m3u8"))
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if err != nil {
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return err
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}
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if err := generated.index(string(body)); err != nil {
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return err
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}
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media.plan.URL = generated.assetURL("index.m3u8")
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media.plan.Player, media.plan.MIME, media.plan.Processing = "hls", "application/vnd.apple.mpegurl", processing
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media.plan.Duration = generated.segments[len(generated.segments)-1].Start + generated.segments[len(generated.segments)-1].Duration
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media.plan.SeekEnd = media.plan.Duration
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return nil
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case <-ticker.C:
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if err := generated.accountCache(); err != nil {
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cancel()
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<-done
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return err
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}
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case <-ctx.Done():
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cancel()
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<-done
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return ctx.Err()
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}
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}
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}
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func (generated *playbackGenerated) accountCache() error {
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entries, err := os.ReadDir(generated.directory)
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if err != nil {
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return err
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}
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var size int64
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for _, entry := range entries {
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info, err := entry.Info()
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if err != nil {
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if os.IsNotExist(err) {
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continue
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}
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return err
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}
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if !info.Mode().IsRegular() || info.Size() > 64<<20 {
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return errors.New("媒体分片超出缓存限制")
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}
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size += info.Size()
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}
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resources := generated.resources
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resources.mu.Lock()
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defer resources.mu.Unlock()
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if resources.cacheBytes+size-generated.bytes > int64(resources.settings.CacheMB)<<20 {
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return errors.New("媒体临时缓存已达上限，请关闭其他播放后重试")
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}
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resources.cacheBytes += size - generated.bytes
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generated.bytes = size
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return nil
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}
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func (generated *playbackGenerated) assetURL(name string) string {
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address := generated.base + name
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if generated.query != "" {
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address += "?" + generated.query
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}
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return address
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}
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func (generated *playbackGenerated) index(playlist string) error {
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if len(playlist) > 2<<20 || !strings.HasPrefix(playlist, "#EXTM3U") || !strings.Contains(playlist, "#EXT-X-ENDLIST") {
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return errors.New("媒体封装尚未完成，不能生成完整播放索引")
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}
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lines := strings.Split(playlist, "\n")
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var start, duration, longest float64
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validName := func(name string) bool {
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return name != "" && filepath.Base(name) == name && !strings.ContainsAny(name, "\\?\x00") && (strings.HasSuffix(name, ".mp4") || strings.HasSuffix(name, ".m4s"))
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}
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for i, line := range lines {
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if strings.HasPrefix(line, "#EXTINF:") {
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value, _, _ := strings.Cut(strings.TrimPrefix(line, "#EXTINF:"), ",")
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var err error
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duration, err = strconv.ParseFloat(value, 64)
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if err != nil || math.IsNaN(duration) || math.IsInf(duration, 0) || duration <= 0 || duration > 3600 {
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return errors.New("媒体分片时长无效")
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}
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longest = math.Max(longest, duration)
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} else if strings.HasPrefix(line, "#EXT-X-MAP:") {
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matches := hlsURIAttribute.FindStringSubmatch(line)
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if len(matches) != 2 || !validName(matches[1]) {
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return errors.New("媒体初始化片段无效")
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}
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generated.files[matches[1]] = true
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lines[i] = strings.Replace(line, matches[0], `URI="`+generated.assetURL(matches[1])+`"`, 1)
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} else if line != "" && !strings.HasPrefix(line, "#") {
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if duration <= 0 || !validName(line) || len(generated.segments) >= 16384 || start+duration > 24*60*60 {
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return errors.New("媒体分片索引无效")
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}
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generated.files[line] = true
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generated.segments = append(generated.segments, playbackSegmentIndex{Name: line, Start: start, Duration: duration})
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start += duration
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duration = 0
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lines[i] = generated.assetURL(line)
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}
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}
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if len(generated.segments) == 0 || duration != 0 {
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return errors.New("媒体播放索引没有完整分片")
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}
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for i, line := range lines {
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if strings.HasPrefix(line, "#EXT-X-TARGETDURATION:") {
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lines[i] = "#EXT-X-TARGETDURATION:" + strconv.Itoa(int(math.Ceil(longest)))
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}
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}
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for name := range generated.files {
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info, err := os.Stat(filepath.Join(generated.directory, name))
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if err != nil {
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return fmt.Errorf("媒体分片未完整生成（%s）：%w", name, err)
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}
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if !info.Mode().IsRegular() {
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return fmt.Errorf("媒体分片未完整生成（%s 不是普通文件）", name)
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}
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if info.Size() <= 0 {
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return fmt.Errorf("媒体分片未完整生成（%s 为空文件）", name)
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}
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}
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generated.playlist = strings.Join(lines, "\n")
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return nil
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}
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func (generated *playbackGenerated) Close() {
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generated.once.Do(func() {
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generated.cancel()
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go func() {
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<-generated.done
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generated.mu.Lock()
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defer generated.mu.Unlock()
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_ = os.RemoveAll(generated.directory)
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generated.resources.mu.Lock()
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generated.resources.cacheBytes -= generated.bytes
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generated.resources.mu.Unlock()
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}()
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})
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}
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func (generated *playbackGenerated) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
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generated.mu.RLock()
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defer generated.mu.RUnlock()
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if generated.ctx.Err() != nil {
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writer.WriteHeader(http.StatusGone)
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return
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}
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name := strings.TrimPrefix(request.URL.Path, generated.base)
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if name == "index.m3u8" {
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writer.Header().Set("Content-Type", "application/vnd.apple.mpegurl")
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http.ServeContent(writer, request, name, time.Time{}, strings.NewReader(generated.playlist))
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return
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}
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if !generated.files[name] {
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http.NotFound(writer, request)
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return
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}
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file, err := os.Open(filepath.Join(generated.directory, name))
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if err != nil {
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http.NotFound(writer, request)
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return
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}
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defer file.Close()
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writer.Header().Set("Content-Type", "video/mp4")
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http.ServeContent(writer, request, name, time.Time{}, file)
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}
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