350 lines
8.1 KiB
Go
350 lines
8.1 KiB
Go
package go_vod
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"hash/fnv"
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"log"
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"math"
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"net/http"
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"os"
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"os/exec"
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"sort"
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"strconv"
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"strings"
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"time"
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)
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type Manager struct {
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c *Config
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path string
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tempDir string
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id string
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close chan string
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inactive int
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probe *ProbeVideoData
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numChunks int
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streams map[string]*Stream
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}
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type ProbeVideoData struct {
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Width int
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Height int
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Duration time.Duration
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FrameRate int
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CodecName string
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BitRate int
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Rotation int
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}
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func NewManager(c *Config, path string, id string, close chan string) (*Manager, error) {
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m := &Manager{c: c, path: path, id: id, close: close}
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m.streams = make(map[string]*Stream)
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h := fnv.New32a()
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h.Write([]byte(path))
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ph := fmt.Sprint(h.Sum32())
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m.tempDir = fmt.Sprintf("%s/%s-%s", m.c.TempDir, id, ph)
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// Delete temp dir if exists
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os.RemoveAll(m.tempDir)
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os.MkdirAll(m.tempDir, 0755)
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if err := m.ffprobe(); err != nil {
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return nil, err
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}
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// heuristic
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if m.probe.CodecName != "h264" {
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m.probe.BitRate *= 2
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}
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m.numChunks = int(math.Ceil(m.probe.Duration.Seconds() / float64(c.ChunkSize)))
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// Possible streams
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m.streams["360p"] = &Stream{c: c, m: m, quality: "360p", height: 360, width: 640, bitrate: 500000}
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m.streams["480p"] = &Stream{c: c, m: m, quality: "480p", height: 480, width: 854, bitrate: 1200000}
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m.streams["720p"] = &Stream{c: c, m: m, quality: "720p", height: 720, width: 1280, bitrate: 2200000}
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m.streams["1080p"] = &Stream{c: c, m: m, quality: "1080p", height: 1080, width: 1920, bitrate: 3600000}
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m.streams["1440p"] = &Stream{c: c, m: m, quality: "1440p", height: 1440, width: 2560, bitrate: 6000000}
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m.streams["2160p"] = &Stream{c: c, m: m, quality: "2160p", height: 2160, width: 3840, bitrate: 10000000}
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// height is our primary dimension for scaling
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// using the probed size, we adjust the width of the stream
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// the smaller dimemension of the output should match the height here
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smDim, lgDim := m.probe.Height, m.probe.Width
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if m.probe.Height > m.probe.Width {
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smDim, lgDim = lgDim, smDim
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}
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// Only keep streams that are smaller than the video
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for k, stream := range m.streams {
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stream.order = 0
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// scale bitrate by frame rate with reference 30
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stream.bitrate = int(float64(stream.bitrate) * float64(m.probe.FrameRate) / 30.0)
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// now store the width of the stream as the larger dimension
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stream.width = int(math.Ceil(float64(lgDim) * float64(stream.height) / float64(smDim)))
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// remove invalid streams
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if (stream.height > smDim || stream.width > lgDim) || // no upscaling; we're not AI
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(float64(stream.bitrate) > float64(m.probe.BitRate)*0.8) || // no more than 80% of original bitrate
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(stream.height%2 != 0 || stream.width%2 != 0) { // no odd dimensions
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// remove stream
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delete(m.streams, k)
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continue
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}
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}
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// Original stream
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m.streams[QUALITY_MAX] = &Stream{
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c: c, m: m,
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quality: QUALITY_MAX,
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height: m.probe.Height,
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width: m.probe.Width,
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bitrate: m.probe.BitRate,
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order: 1,
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}
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// Start all streams
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for _, stream := range m.streams {
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go stream.Run()
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}
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log.Printf("%s: new manager for %s", m.id, m.path)
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// Check for inactivity
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go func() {
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t := time.NewTicker(5 * time.Second)
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defer t.Stop()
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for {
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<-t.C
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if m.inactive == -1 {
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t.Stop()
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return
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}
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m.inactive++
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// Check if any stream is active
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for _, stream := range m.streams {
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if stream.coder != nil {
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m.inactive = 0
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break
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}
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}
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// Nothing done for 5 minutes
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if m.inactive >= m.c.ManagerIdleTime/5 {
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t.Stop()
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m.Destroy()
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m.close <- m.id
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return
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}
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}
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}()
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return m, nil
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}
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// Destroys streams. DOES NOT emit on the close channel.
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func (m *Manager) Destroy() {
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log.Printf("%s: destroying manager", m.id)
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m.inactive = -1
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for _, stream := range m.streams {
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stream.Stop()
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}
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// Delete temp dir
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os.RemoveAll(m.tempDir)
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// Delete file if temp
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freeIfTemp(m.path)
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}
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func (m *Manager) ServeHTTP(w http.ResponseWriter, r *http.Request, chunk string) error {
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// Master list
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if chunk == "index.m3u8" {
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return m.ServeIndex(w, r)
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}
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// Stream list
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m3u8Sfx := ".m3u8"
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if strings.HasSuffix(chunk, m3u8Sfx) {
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quality := strings.TrimSuffix(chunk, m3u8Sfx)
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if stream, ok := m.streams[quality]; ok {
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return stream.ServeList(w, r)
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}
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}
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// Stream chunk
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tsSfx := ".ts"
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if strings.HasSuffix(chunk, tsSfx) {
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parts := strings.Split(chunk, "-")
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if len(parts) != 2 {
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w.WriteHeader(http.StatusBadRequest)
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return nil
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}
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quality := parts[0]
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chunkIdStr := strings.TrimSuffix(parts[1], tsSfx)
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chunkId, err := strconv.Atoi(chunkIdStr)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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return nil
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}
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if stream, ok := m.streams[quality]; ok {
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return stream.ServeChunk(w, chunkId)
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}
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}
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// Stream full video
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mp4Sfx := ".mp4"
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if strings.HasSuffix(chunk, mp4Sfx) {
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quality := strings.TrimSuffix(chunk, mp4Sfx)
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if stream, ok := m.streams[quality]; ok {
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return stream.ServeFullVideo(w, r)
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}
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// Fall back to original
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return m.streams[QUALITY_MAX].ServeFullVideo(w, r)
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}
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w.WriteHeader(http.StatusNotFound)
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return nil
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}
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func (m *Manager) ServeIndex(w http.ResponseWriter, r *http.Request) error {
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WriteM3U8ContentType(w)
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w.Write([]byte("#EXTM3U\n"))
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// get sorted streams by bitrate
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streams := make([]*Stream, 0)
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for _, stream := range m.streams {
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streams = append(streams, stream)
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}
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sort.Slice(streams, func(i, j int) bool {
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return streams[i].order < streams[j].order ||
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(streams[i].order == streams[j].order && streams[i].bitrate < streams[j].bitrate)
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})
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// Write all streams
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query := GetQueryString(r)
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for _, stream := range streams {
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s := fmt.Sprintf("#EXT-X-STREAM-INF:BANDWIDTH=%d,RESOLUTION=%dx%d,FRAME-RATE=%d\n%s.m3u8%s\n", stream.bitrate, stream.width, stream.height, m.probe.FrameRate, stream.quality, query)
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w.Write([]byte(s))
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}
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return nil
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}
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func (m *Manager) ffprobe() error {
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args := []string{
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// Hide debug information
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"-v", "error",
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// Show everything
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"-show_entries", "format:stream",
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"-select_streams", "v", // Video stream only, we're not interested in audio
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"-of", "json",
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m.path,
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}
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ctx, cancel := context.WithDeadline(context.TODO(), time.Now().Add(5*time.Second))
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defer cancel()
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cmd := exec.CommandContext(ctx, m.c.FFprobe, args...)
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var stdout, stderr bytes.Buffer
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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err := cmd.Run()
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if err != nil {
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log.Println(stderr.String())
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return err
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}
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out := struct {
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Streams []struct {
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Width int `json:"width"`
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Height int `json:"height"`
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Duration string `json:"duration"`
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FrameRate string `json:"avg_frame_rate"`
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CodecName string `json:"codec_name"`
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BitRate string `json:"bit_rate"`
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SideDataList []struct {
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SideDataType string `json:"side_data_type"`
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Rotation int `json:"rotation"`
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} `json:"side_data_list"`
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} `json:"streams"`
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Format struct {
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Duration string `json:"duration"`
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} `json:"format"`
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}{}
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if err := json.Unmarshal(stdout.Bytes(), &out); err != nil {
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return err
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}
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if len(out.Streams) == 0 {
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return errors.New("no video streams found")
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}
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var duration time.Duration
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if out.Streams[0].Duration != "" {
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duration, _ = time.ParseDuration(out.Streams[0].Duration + "s")
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} else if out.Format.Duration != "" {
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duration, _ = time.ParseDuration(out.Format.Duration + "s")
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}
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// FrameRate is a fraction string
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frac := strings.Split(out.Streams[0].FrameRate, "/")
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if len(frac) != 2 {
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frac = []string{"30", "1"}
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}
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num, e1 := strconv.Atoi(frac[0])
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den, e2 := strconv.Atoi(frac[1])
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if e1 != nil || e2 != nil {
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num = 30
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den = 1
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}
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frameRate := float64(num) / float64(den)
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// BitRate is a string
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bitRate, err := strconv.Atoi(out.Streams[0].BitRate)
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if err != nil {
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bitRate = 5000000
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}
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// Get rotation from side data
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rotation := 0
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for _, sideData := range out.Streams[0].SideDataList {
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if sideData.SideDataType == "Display Matrix" {
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rotation = sideData.Rotation
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}
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}
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m.probe = &ProbeVideoData{
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Width: out.Streams[0].Width,
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Height: out.Streams[0].Height,
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Duration: duration,
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FrameRate: int(frameRate),
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CodecName: out.Streams[0].CodecName,
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BitRate: bitRate,
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Rotation: rotation,
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}
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return nil
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}
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