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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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"bytes"
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"encoding/hex"
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"flag"
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/q191201771/naza/pkg/nazastring"
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"github.com/q191201771/lal/pkg/rtmp"
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"github.com/q191201771/lal/pkg/avc"
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"github.com/q191201771/lal/pkg/hevc"
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"github.com/q191201771/naza/pkg/bele"
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"github.com/q191201771/naza/pkg/bitrate"
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"github.com/q191201771/lal/pkg/httpflv"
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"github.com/q191201771/naza/pkg/nazalog"
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)
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// 分析诊断HTTP-FLV流的时间戳。注意，这个程序还没有完成。
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// 功能：
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// - 时间戳回退检查
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// - 当音频时间戳出现回退时打error日志
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// - 当视频时间戳出现回退时打error日志
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// - 将音频和视频时间戳看成一个整体，出现回退时打error日志
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// - 定时打印：
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// - 总体带宽
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// - 音频带宽
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// - 视频带宽
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// - 视频DTS和PTS不相等的计数
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// - I帧间隔时间
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// - H264
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// - 打印每个tag的类型：key seq header...
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// - 打印每个tag中有多少个帧：SPS PPS SEI IDR SLICE...
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// - 打印每个SLICE的类型：I、P、B...
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// 解析metadata信息，并打印
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// TODO
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// - 检查时间戳正向大的跳跃
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// - 打印GOP中帧数量？
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// - slice_num?
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// - 输入源可以是httpflv，也可以是flv文件
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var (
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timestampCheckFlag = true
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printStatFlag = true
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printEveryTagFlag = false
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printMetaData = true
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analysisVideoTagFlag = true
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)
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var (
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prevAudioTS = int64(-1)
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prevVideoTS = int64(-1)
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prevTS = int64(-1)
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prevIDRTS = int64(-1)
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diffIDRTS = int64(-1)
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)
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func main() {
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url := parseFlag()
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session := httpflv.NewPullSession()
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brTotal := bitrate.New()
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brAudio := bitrate.New()
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brVideo := bitrate.New()
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videoCTSNotZeroCount := 0
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go func() {
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for {
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time.Sleep(1 * time.Second)
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if printStatFlag {
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nazalog.Debugf("stat. total=%dKb/s, audio=%dKb/s, video=%dKb/s, videoCTSNotZeroCount=%d, diffIDRTS=%d",
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int(brTotal.Rate()), int(brAudio.Rate()), int(brVideo.Rate()), videoCTSNotZeroCount, diffIDRTS)
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}
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}
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}()
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err := session.Pull(url, func(tag httpflv.Tag) {
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if printEveryTagFlag {
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debugLength := 32
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if len(tag.Raw) < 32 {
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debugLength = len(tag.Raw)
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}
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nazalog.Debugf("header=%+v, hex=%s", tag.Header, hex.Dump(tag.Raw[11:debugLength]))
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}
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brTotal.Add(len(tag.Raw))
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switch tag.Header.Type {
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case httpflv.TagTypeMetadata:
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if printMetaData {
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nazalog.Debugf("----------\n%s", hex.Dump(tag.Raw[11:]))
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opa, err := rtmp.ParseMetadata(tag.Raw[11 : len(tag.Raw)-4])
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nazalog.Assert(nil, err)
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var buf bytes.Buffer
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buf.WriteString(fmt.Sprintf("-----\ncount:%d\n", len(opa)))
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for _, op := range opa {
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buf.WriteString(fmt.Sprintf(" %s: %+v\n", op.Key, op.Value))
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}
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nazalog.Debugf("%+v", buf.String())
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}
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case httpflv.TagTypeAudio:
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brAudio.Add(len(tag.Raw))
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if timestampCheckFlag {
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if prevAudioTS != -1 && int64(tag.Header.Timestamp) < prevAudioTS {
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nazalog.Errorf("audio timestamp error, less than prev audio timestamp. header=%+v, prevAudioTS=%d, diff=%d", tag.Header, prevAudioTS, int64(tag.Header.Timestamp)-prevAudioTS)
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}
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if prevTS != -1 && int64(tag.Header.Timestamp) < prevTS {
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nazalog.Warnf("audio timestamp error. less than prev global timestamp. header=%+v, prevTS=%d, diff=%d", tag.Header, prevTS, int64(tag.Header.Timestamp)-prevTS)
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}
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}
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prevAudioTS = int64(tag.Header.Timestamp)
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prevTS = int64(tag.Header.Timestamp)
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case httpflv.TagTypeVideo:
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analysisVideoTag(tag)
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videoCTS := bele.BEUint24(tag.Raw[13:])
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if videoCTS != 0 {
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videoCTSNotZeroCount++
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}
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brVideo.Add(len(tag.Raw))
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if timestampCheckFlag {
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if prevVideoTS != -1 && int64(tag.Header.Timestamp) < prevVideoTS {
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nazalog.Errorf("video timestamp error, less than prev video timestamp. header=%+v, prevVideoTS=%d, diff=%d", tag.Header, prevVideoTS, int64(tag.Header.Timestamp)-prevVideoTS)
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}
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if prevTS != -1 && int64(tag.Header.Timestamp) < prevTS {
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nazalog.Warnf("video timestamp error, less than prev global timestamp. header=%+v, prevTS=%d, diff=%d", tag.Header, prevTS, int64(tag.Header.Timestamp)-prevTS)
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}
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}
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prevVideoTS = int64(tag.Header.Timestamp)
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prevTS = int64(tag.Header.Timestamp)
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}
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})
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nazalog.Warn(err)
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}
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const (
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typeUnknown uint8 = 1
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typeAVC uint8 = 2
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typeHEVC uint8 = 3
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)
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var t uint8 = typeUnknown
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func analysisVideoTag(tag httpflv.Tag) {
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var buf bytes.Buffer
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if tag.IsVideoKeySeqHeader() {
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if tag.IsAVCKeySeqHeader() {
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t = typeAVC
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buf.WriteString(" [AVC SeqHeader] ")
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if _, _, err := avc.ParseSPSPPSFromSeqHeader(tag.Raw[11:]); err != nil {
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buf.WriteString(" parse sps pps failed.")
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}
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} else if tag.IsHEVCKeySeqHeader() {
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t = typeHEVC
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//nazalog.Debugf("%s", nazastring.DumpSliceByte(tag.Raw[11:]))
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vps, sps, pps, _ := hevc.ParseVPSSPSPPSFromSeqHeader(tag.Raw[11:])
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nazalog.Debugf("%s", nazastring.DumpSliceByte(vps))
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nazalog.Debugf("%s", nazastring.DumpSliceByte(sps))
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nazalog.Debugf("%s", nazastring.DumpSliceByte(pps))
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//nazalog.Debugf("%s %s %s %+v", hex.Dump(vps), hex.Dump(sps), hex.Dump(pps), err)
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buf.WriteString(" [HEVC SeqHeader] ")
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}
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} else {
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body := tag.Raw[11:]
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i := 5
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for i != int(tag.Header.DataSize) {
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if i+4 > int(tag.Header.DataSize) {
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nazalog.Errorf("invalid nalu size. i=%d, tag size=%d", i, int(tag.Header.DataSize))
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break
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}
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naluLen := bele.BEUint32(body[i:])
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if i+int(naluLen) > int(tag.Header.DataSize) {
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nazalog.Errorf("invalid nalu size. i=%d, naluLen=%d, tag size=%d", i, naluLen, int(tag.Header.DataSize))
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break
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}
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switch t {
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case typeAVC:
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if avc.ParseNALUType(body[i+4]) == avc.NALUTypeIDRSlice {
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if prevIDRTS != int64(-1) {
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diffIDRTS = int64(tag.Header.Timestamp) - prevIDRTS
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}
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prevIDRTS = int64(tag.Header.Timestamp)
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}
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if avc.ParseNALUType(body[i+4]) == avc.NALUTypeSEI {
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delay := SEIDelayMS(body[i+4 : i+4+int(naluLen)])
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if delay != -1 {
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buf.WriteString(fmt.Sprintf("delay: %dms", delay))
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}
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}
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sliceTypeReadable, _ := avc.ParseSliceTypeReadable(body[i+4:])
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buf.WriteString(fmt.Sprintf(" [%s(%s)] ", avc.ParseNALUTypeReadable(body[i+4]), sliceTypeReadable))
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case typeHEVC:
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if hevc.ParseNALUType(body[i+4]) == hevc.NALUTypeSEI {
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delay := SEIDelayMS(body[i+4 : i+4+int(naluLen)])
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if delay != -1 {
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buf.WriteString(fmt.Sprintf("delay: %dms", delay))
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}
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}
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buf.WriteString(fmt.Sprintf(" [%s] ", hevc.ParseNALUTypeReadable(body[i+4])))
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}
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i = i + 4 + int(naluLen)
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}
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}
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if analysisVideoTagFlag {
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nazalog.Debug(buf.String())
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}
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}
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// 注意，SEI的内容是自定义格式，解析的代码不具有通用性
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func SEIDelayMS(seiNALU []byte) int {
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//nazalog.Debugf("sei: %s", hex.Dump(seiNALU))
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items := strings.Split(string(seiNALU), ":")
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if len(items) != 3 {
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return -1
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}
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a, err := strconv.ParseInt(items[1], 10, 64)
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if err != nil {
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return -1
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}
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t := time.Unix(a/1e3, a%1e3)
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d := time.Now().Sub(t)
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return int(d.Nanoseconds() / 1e6)
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}
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func parseFlag() string {
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url := flag.String("i", "", "specify http-flv url")
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flag.Parse()
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if *url == "" {
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flag.Usage()
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os.Exit(1)
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}
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return *url
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}
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