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metadata.go
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/
metadata.go
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// Copyright 2020, Chef. All rights reserved.
// https://github.com/forkiss/lal
//
// Use of this source code is governed by a MIT-style license
// that can be found in the License file.
//
// Author: Chef (191201771@qq.com)
package rtmp
import (
"bytes"
"github.com/forkiss/naza/pkg/nazabytes"
"github.com/forkiss/naza/pkg/nazalog"
"github.com/forkiss/lal/pkg/base"
)
func ParseMetadata(b []byte) (ObjectPairArray, error) {
pos := 0
v, l, err := Amf0.ReadString(b[pos:])
if err != nil {
return nil, err
}
pos += l
if v == "@setDataFrame" {
_, l, err = Amf0.ReadString(b[pos:])
if err != nil {
return nil, err
}
pos += l
}
opa, _, err := Amf0.ReadObjectOrArray(b[pos:])
return opa, err
}
// TODO(chef): [test] MetadataEnsureWithSetDataFrame 这两个函数增加单元测试 202207
// MetadataEnsureWithSdf
//
// 确保metadata中包含@setDataFrame
//
// @return 返回的内存块为内部独立申请
//
func MetadataEnsureWithSdf(b []byte) ([]byte, error) {
var ret []byte
v, _, err := Amf0.ReadString(b)
if err != nil {
nazalog.Errorf("%+v", err)
return append(ret, b...), err
}
// 已经有了
if v == "@setDataFrame" {
return append(ret, b...), nil
}
buf := nazabytes.NewBuffer(16 + len(b)) // 16=1+2+13 @setDataFrame
if err = Amf0.WriteString(buf, "@setDataFrame"); err != nil {
nazalog.Errorf("%+v", err)
return append(ret, b...), err
}
_, err = buf.Write(b)
return buf.Bytes(), err
}
// MetadataEnsureWithoutSdf
//
// 确保metadata中不包含@setDataFrame
//
// @return 返回的内存块为内部独立申请
//
func MetadataEnsureWithoutSdf(b []byte) ([]byte, error) {
var ret []byte
v, l, err := Amf0.ReadString(b)
if err != nil {
nazalog.Errorf("%+v", err)
return append(ret, b...), err
}
// 本来就不包含
if v != "@setDataFrame" {
return append(ret, b...), nil
}
return append(ret, b[l:]...), nil
}
// BuildMetadata spec-video_file_format_spec_v10.pdf
// onMetaData
// - duration DOUBLE, seconds
// - width DOUBLE
// - height DOUBLE
// - videodatarate DOUBLE
// - framerate DOUBLE
// - videocodecid DOUBLE
// - audiosamplerate DOUBLE
// - audiosamplesize DOUBLE
// - stereo BOOL
// - audiocodecid DOUBLE
// - filesize DOUBLE, bytes
//
// 目前包含的字段:
// - width
// - height
// - audiocodecid
// - videocodecid
// - version
//
// @param width 如果为-1,则metadata中不写入该字段
// @param height 如果为-1,则metadata中不写入该字段
// @param audiocodecid 如果为-1,则metadata中不写入该字段
// AAC 10
// @param videocodecid 如果为-1,则metadata中不写入该字段
// H264 7
// H265 12
// @return 返回的内存块为新申请的独立内存块
func BuildMetadata(width int, height int, audiocodecid int, videocodecid int) ([]byte, error) {
buf := &bytes.Buffer{}
if err := Amf0.WriteString(buf, "onMetaData"); err != nil {
return nil, err
}
var opa ObjectPairArray
if width != -1 {
opa = append(opa, ObjectPair{
Key: "width",
Value: width,
})
}
if height != -1 {
opa = append(opa, ObjectPair{
Key: "height",
Value: height,
})
}
if audiocodecid != -1 {
opa = append(opa, ObjectPair{
Key: "audiocodecid",
Value: audiocodecid,
})
}
if videocodecid != -1 {
opa = append(opa, ObjectPair{
Key: "videocodecid",
Value: videocodecid,
})
}
opa = append(opa, ObjectPair{
Key: "version",
Value: base.LalRtmpBuildMetadataEncoder,
})
if err := Amf0.WriteObject(buf, opa); err != nil {
return nil, err
}
return buf.Bytes(), nil
}