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// Copyright 2019, Chef. All rights reserved.
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// https://github.com/q191201771/lal
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package main
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import (
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"flag"
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"os"
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"github.com/q191201771/lal/pkg/base"
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"github.com/q191201771/lal/pkg/httpflv"
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"github.com/q191201771/lal/pkg/rtmp"
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"github.com/q191201771/naza/pkg/nazalog"
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"m7s.live/engine/v4/util/bits/pio"
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)
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// 拉取HTTP-FLV的流
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//
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// TODO
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// - 存储成flv文件
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// - 拉取HTTP-FLV流进行分析参见另外一个demo：analyseflv。 这个demo可能可以删除掉了。
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func main() {
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_ = nazalog.Init(func(option *nazalog.Option) {
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option.AssertBehavior = nazalog.AssertFatal
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})
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defer nazalog.Sync()
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base.LogoutStartInfo()
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url, flvname := parseFlag()
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flvfile, err := os.Create(flvname)
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if err != nil {
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nazalog.Errorf("create flv file failed, err=%+v", err)
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return
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}
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session := httpflv.NewPullSession()
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err = session.Pull(url, func(tag httpflv.Tag) {
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if tag.Header.Type == httpflv.TagTypeMetadata {
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// 根据metadata填写flv头
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opa, err := rtmp.ParseMetadata(tag.Payload())
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if err != nil {
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nazalog.Errorf("ParseMetadata failed, err=%+v", err)
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return
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}
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b := make([]byte, 13)
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var flags uint8
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audiocodecid := opa.Find("audiocodecid")
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videocodecid := opa.Find("videocodecid")
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if audiocodecid != 0 {
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flags |= 0x04
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}
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if videocodecid != 0 {
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flags |= 0x01
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}
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writeFlvHeader(b, flags)
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flvfile.Write(b)
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}
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nazalog.Infof("tag Type:%d, tag Size:%d", tag.Header.Type, tag.Header.DataSize)
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flvfile.Write(tag.Raw)
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})
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nazalog.Assert(nil, err)
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err = <-session.WaitChan()
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nazalog.Assert(nil, err)
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}
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func parseFlag() (url, flvfile string) {
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i := flag.String("i", "", "specify http-flv url")
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o := flag.String("o", "", "specify output flv file")
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flag.Parse()
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if *i == "" || *o == "" {
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flag.Usage()
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base.OsExitAndWaitPressIfWindows(1)
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}
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return *i, *o
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}
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func writeFlvHeader(b []byte, flags uint8) {
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// 'FLV', version 1
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pio.PutU32BE(b[0:4], 0x464c5601)
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b[4] = flags
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// DataOffset: UI32 Offset in bytes from start of file to start of body (that is, size of header)
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// The DataOffset field usually has a value of 9 for FLV version 1.
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pio.PutU32BE(b[5:9], 9)
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// PreviousTagSize0: UI32 Always 0
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pio.PutU32BE(b[9:13], 0)
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return
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}
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