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// Copyright 2020, 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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"strconv"
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"strings"
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"github.com/q191201771/lal/pkg/base"
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)
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func ParseASC(a *AFmtPBase) ([]byte, error) {
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if a.Format != base.RTPPacketTypeAAC {
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return nil, ErrSDP
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}
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v, ok := a.Parameters["config"]
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if !ok {
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return nil, ErrSDP
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}
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if len(v) < 4 || (len(v)%2) != 0 {
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return nil, ErrSDP
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}
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l := len(v) / 2
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r := make([]byte, l)
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for i := 0; i < l; i++ {
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b, err := strconv.ParseInt(v[i*2:i*2+2], 16, 0)
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if err != nil {
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return nil, ErrSDP
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}
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r[i] = uint8(b)
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}
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return r, nil
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}
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func ParseVPSSPSPPS(a *AFmtPBase) (vps, sps, pps []byte, err error) {
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v, ok := a.Parameters["sprop-vps"]
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if !ok {
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return nil, nil, nil, ErrSDP
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}
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if vps, err = base64.StdEncoding.DecodeString(v); err != nil {
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return nil, nil, nil, err
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}
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v, ok = a.Parameters["sprop-sps"]
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if !ok {
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return nil, nil, nil, ErrSDP
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}
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if sps, err = base64.StdEncoding.DecodeString(v); err != nil {
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return nil, nil, nil, err
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}
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v, ok = a.Parameters["sprop-pps"]
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if !ok {
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return nil, nil, nil, ErrSDP
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}
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if pps, err = base64.StdEncoding.DecodeString(v); err != nil {
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return nil, nil, nil, err
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}
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return
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}
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// 解析AVC/H264的sps，pps
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// 例子见单元测试
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func ParseSPSPPS(a *AFmtPBase) (sps, pps []byte, err error) {
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v, ok := a.Parameters["sprop-parameter-sets"]
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if !ok {
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return nil, nil, ErrSDP
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}
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items := strings.SplitN(v, ",", 2)
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if len(items) != 2 {
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return nil, nil, ErrSDP
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}
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sps, err = base64.StdEncoding.DecodeString(items[0])
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if err != nil {
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return nil, nil, ErrSDP
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}
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pps, err = base64.StdEncoding.DecodeString(items[1])
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return
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}
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