示例#1
0
文件: writer.go 项目: louisyoo/mp4
func (self *SimpleH264Writer) prepare() (err error) {
	if self.mdatWriter, err = atom.WriteAtomHeader(self.W, "mdat"); err != nil {
		return
	}

	if len(self.SPS) == 0 {
		err = fmt.Errorf("invalid SPS")
		return
	}

	if len(self.PPS) == 0 {
		err = fmt.Errorf("invalid PPS")
		return
	}

	if self.Width == 0 || self.Height == 0 {
		var info *atom.H264SPSInfo
		if info, err = atom.ParseH264SPS(self.SPS[1:]); err != nil {
			return
		}
		self.Width = int(info.Width)
		self.Height = int(info.Height)
	}

	self.sampleIdx = 1

	self.sample = &atom.SampleTable{
		SampleDesc: &atom.SampleDesc{
			Avc1Desc: &atom.Avc1Desc{
				DataRefIdx:           1,
				HorizontalResolution: 72,
				VorizontalResolution: 72,
				Width:                self.Width,
				Height:               self.Height,
				FrameCount:           1,
				Depth:                24,
				ColorTableId:         -1,
				Conf:                 &atom.Avc1Conf{},
			},
		},
		TimeToSample: &atom.TimeToSample{},
		SampleToChunk: &atom.SampleToChunk{
			Entries: []atom.SampleToChunkEntry{
				{
					FirstChunk:   1,
					SampleDescId: 1,
				},
			},
		},
		SampleSize: &atom.SampleSize{},
		ChunkOffset: &atom.ChunkOffset{
			Entries: []int{8},
		},
		SyncSample: &atom.SyncSample{},
	}
	self.sampleToChunk = &self.sample.SampleToChunk.Entries[0]

	return
}
示例#2
0
文件: test.go 项目: louisyoo/mp4
func TestConvert(filename string) (err error) {
	var osfile *os.File
	if osfile, err = os.Open(filename); err != nil {
		return
	}

	var finfo os.FileInfo
	if finfo, err = osfile.Stat(); err != nil {
		return
	}
	log.Println("filesize", finfo.Size())

	lr := &io.LimitedReader{R: osfile, N: finfo.Size()}

	var outfile *os.File
	if outfile, err = os.Create(filename + ".out.mp4"); err != nil {
		return
	}

	for lr.N > 0 {
		var ar *io.LimitedReader

		var cc4 string
		if ar, cc4, err = atom.ReadAtomHeader(lr, ""); err != nil {
			return
		}

		if cc4 == "moov" {

			curPos, _ := outfile.Seek(0, 1)
			origSize := ar.N + 8
			var moov *atom.Movie
			if moov, err = atom.ReadMovie(ar); err != nil {
				return
			}

			//log.Println(moov.Tracks[0].Media.Info.Data.Refer)

			if err = atom.WriteMovie(outfile, moov); err != nil {
				return
			}
			curPosAfterRead, _ := outfile.Seek(0, 1)
			bytesWritten := curPosAfterRead - curPos

			log.Println("regen moov", "tracks nr", len(moov.Tracks),
				"origSize", origSize, "bytesWritten", bytesWritten,
			)

			padSize := origSize - bytesWritten - 8
			aw, _ := atom.WriteAtomHeader(outfile, "free")
			atom.WriteDummy(outfile, int(padSize))
			aw.Close()

		} else {

			outcc4 := cc4
			if outcc4 != "mdat" {
				log.Println("omit", cc4)
				outcc4 = "free"
			} else {
				log.Println("copy", cc4)
			}

			var aw *atom.Writer
			if aw, err = atom.WriteAtomHeader(outfile, outcc4); err != nil {
				return
			}

			if _, err = io.CopyN(aw, ar, ar.N); err != nil {
				return
			}
			if err = aw.Close(); err != nil {
				return
			}
		}

		//log.Println("atom", cc4, "left", lr.N)
		//atom.ReadDummy(ar, int(ar.N))
	}

	if err = outfile.Close(); err != nil {
		return
	}

	return
}