134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
package processor
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import (
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"bufio"
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"github.com/bluenviron/mediacommon/pkg/codecs/mpeg4audio"
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"os"
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"sync"
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"github.com/bluenviron/gortsplib/v4/pkg/format"
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"github.com/bluenviron/mediacommon/pkg/codecs/h264"
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"github.com/bluenviron/mediacommon/pkg/formats/mpegts"
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)
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func multiplyAndDivide(v, m, d int64) int64 {
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secs := v / d
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dec := v % d
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return (secs*m + dec*m/d)
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}
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// MpegtsMuxer allows to save a H264 / MPEG-4 audio stream into a MPEG-TS file.
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type MpegtsMuxer struct {
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FileName string
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H264Format *format.H264
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Mpeg4AudioFormat *format.MPEG4Audio
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f *os.File
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b *bufio.Writer
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w *mpegts.Writer
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h264Track *mpegts.Track
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mpeg4AudioTrack *mpegts.Track
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dtsExtractor *h264.DTSExtractor2
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mutex sync.Mutex
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}
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// Initialize initializes a MpegtsMuxer.
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func (e *MpegtsMuxer) Initialize() error {
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var err error
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e.f, err = os.Create(e.FileName)
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if err != nil {
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return err
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}
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e.b = bufio.NewWriter(e.f)
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e.h264Track = &mpegts.Track{
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Codec: &mpegts.CodecH264{},
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}
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e.mpeg4AudioTrack = &mpegts.Track{
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Codec: &mpegts.CodecMPEG4Audio{
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Config: mpeg4audio.Config{},
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},
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}
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e.w = mpegts.NewWriter(e.b, []*mpegts.Track{e.h264Track, e.mpeg4AudioTrack})
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return nil
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}
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// Close closes all the MpegtsMuxer resources.
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func (e *MpegtsMuxer) Close() {
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e.b.Flush()
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e.f.Close()
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}
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// WriteH264 writes a H264 access unit into MPEG-TS.
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func (e *MpegtsMuxer) WriteH264(pts int64, au [][]byte) error {
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e.mutex.Lock()
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defer e.mutex.Unlock()
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var filteredAU [][]byte
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nonIDRPresent := false
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idrPresent := false
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for _, nalu := range au {
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typ := h264.NALUType(nalu[0] & 0x1F)
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switch typ {
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case h264.NALUTypeSPS:
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e.H264Format.SPS = nalu
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continue
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case h264.NALUTypePPS:
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e.H264Format.PPS = nalu
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continue
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case h264.NALUTypeAccessUnitDelimiter:
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continue
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case h264.NALUTypeIDR:
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idrPresent = true
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case h264.NALUTypeNonIDR:
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nonIDRPresent = true
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}
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filteredAU = append(filteredAU, nalu)
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}
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au = filteredAU
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if au == nil || (!nonIDRPresent && !idrPresent) {
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return nil
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}
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// Add SPS and PPS before access unit that contains an IDR.
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if idrPresent {
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au = append([][]byte{e.H264Format.SPS, e.H264Format.PPS}, au...)
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}
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if e.dtsExtractor == nil {
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// Skip samples silently until we find one with an IDR.
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if !idrPresent {
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return nil
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}
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e.dtsExtractor = h264.NewDTSExtractor2()
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}
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dts, err := e.dtsExtractor.Extract(au, pts)
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if err != nil {
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return err
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}
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// Encode into MPEG-TS.
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return e.w.WriteH2642(e.h264Track, pts, dts, au)
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}
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// WriteAAC writes MPEG-4 audio access units into MPEG-TS.
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func (e *MpegtsMuxer) WriteAAC(aus [][]byte, pts int64) error {
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e.mutex.Lock()
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defer e.mutex.Unlock()
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return e.w.WriteMPEG4Audio(e.mpeg4AudioTrack, multiplyAndDivide(pts, 90000, int64(8000)), aus)
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}
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