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// Copyright 2021, 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 sdp
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import (
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"strings"
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"github.com/q191201771/naza/pkg/nazaerrors"
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"github.com/q191201771/lal/pkg/aac"
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"github.com/q191201771/lal/pkg/base"
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)
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// Pack
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//
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// @param samplingFrequency: 音频采样率，注意，当前G711U使用这个参数传递，AAC的采样率通过 asc 参数传递 TODO(chef): 考虑 AAC 采样率通过 samplingFrequency 传递 202303
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func Pack(vps, sps, pps, asc []byte, audioPt base.AvPacketPt, samplingFrequency int) (ctx LogicContext, err error) {
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// 判断音频、视频是否存在，以及视频是H264还是H265
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var hasAudio, hasVideo, isHevc, isAac bool
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if sps != nil && pps != nil {
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hasVideo = true
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if vps != nil {
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isHevc = true
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}
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}
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if audioPt != base.AvPacketPtUnknown {
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switch audioPt {
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case base.AvPacketPtG711U:
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hasAudio = true
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case base.AvPacketPtAac:
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if asc != nil {
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isAac = true
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hasAudio = true
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// 判断AAC的采样率
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var ascCtx *aac.AscContext
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ascCtx, err = aac.NewAscContext(asc)
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if err != nil {
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return
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}
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samplingFrequency, err = ascCtx.GetSamplingFrequency()
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if err != nil {
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return
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}
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}
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}
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}
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if !hasAudio && !hasVideo {
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err = nazaerrors.Wrap(base.ErrSdp)
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return
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}
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sdpStr := fmt.Sprintf(`v=0
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o=- 0 0 IN IP4 127.0.0.1
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s=No Name
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c=IN IP4 127.0.0.1
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t=0 0
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a=tool:%s
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`, base.LalPackSdp)
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streamid := 0
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if hasVideo {
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if isHevc {
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tmpl := `m=video 0 RTP/AVP 98
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a=rtpmap:98 H265/90000
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a=fmtp:98 profile-id=1;sprop-sps=%s;sprop-pps=%s;sprop-vps=%s
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a=control:streamid=%d
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`
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sdpStr += fmt.Sprintf(tmpl, base64.StdEncoding.EncodeToString(sps), base64.StdEncoding.EncodeToString(pps), base64.StdEncoding.EncodeToString(vps), streamid)
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} else {
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tmpl := `m=video 0 RTP/AVP 96
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a=rtpmap:96 H264/90000
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a=fmtp:96 packetization-mode=1; sprop-parameter-sets=%s,%s; profile-level-id=640016
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a=control:streamid=%d
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`
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sdpStr += fmt.Sprintf(tmpl, base64.StdEncoding.EncodeToString(sps), base64.StdEncoding.EncodeToString(pps), streamid)
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}
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streamid++
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}
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if hasAudio {
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if isAac {
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tmpl := `m=audio 0 RTP/AVP 97
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b=AS:128
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a=rtpmap:97 MPEG4-GENERIC/%d/2
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a=fmtp:97 profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3; config=%s
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a=control:streamid=%d
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`
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sdpStr += fmt.Sprintf(tmpl, samplingFrequency, hex.EncodeToString(asc), streamid)
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} else {
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tmpl := `m=audio 0 RTP/AVP 0
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a=rtpmap:0 PCMU/%d
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a=control:streamid=%d
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`
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sdpStr += fmt.Sprintf(tmpl, samplingFrequency, streamid)
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}
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}
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raw := []byte(strings.ReplaceAll(sdpStr, "\n", "\r\n"))
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ctx, err = ParseSdp2LogicContext(raw)
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return
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}
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