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92 lines
3.0 KiB
92 lines
3.0 KiB
package com.inspect.tcpserver.sip.media;
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import java.util.StringTokenizer;
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public class SdpParser {
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public static SdpInfo parse(String sdp) {
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SdpInfo info = new SdpInfo();
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String[] lines = sdp.split("\\r?\\n");
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for (String line : lines) {
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line = line.trim();
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if (line.isEmpty()) continue;
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// ---------- 会话级 ----------
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if (line.startsWith("c=")) {
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// c=IN IP4 192.168.1.116
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String[] parts = line.split("\\s+");
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if (parts.length >= 3) {
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info.setRemoteIp(parts[2]);
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}
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}
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// ---------- media ----------
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else if (line.startsWith("m=video")) {
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// m=video 50000 TCP/AVP 98
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StringTokenizer st = new StringTokenizer(line);
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st.nextToken(); // m=video
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info.setMediaPort(Integer.parseInt(st.nextToken()));
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String proto = st.nextToken();
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if (proto.toUpperCase().contains("TCP")) {
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info.setTransport(SdpInfo.Transport.RTP_TCP);
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} else {
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info.setTransport(SdpInfo.Transport.RTP_UDP);
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}
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info.setPayloadType(Integer.parseInt(st.nextToken()));
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}
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// ---------- rtpmap ----------
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else if (line.startsWith("a=rtpmap")) {
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// a=rtpmap:98 H264/90000
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String value = line.substring("a=rtpmap:".length());
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String[] parts = value.split("\\s+");
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if (parts.length == 2) {
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String[] codecInfo = parts[1].split("/");
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info.setCodec(codecInfo[0]);
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info.setClockRate(Integer.parseInt(codecInfo[1]));
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}
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}
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// ---------- setup ----------
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else if (line.startsWith("a=setup:")) {
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info.setSetup(line.substring("a=setup:".length()));
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}
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// ---------- connection ----------
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else if (line.startsWith("a=connection:")) {
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info.setConnection(line.substring("a=connection:".length()));
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}
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// ---------- fmtp ----------
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else if (line.startsWith("a=fmtp:")) {
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// 可留作扩展
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info.putAttribute("fmtp", line);
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}
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// ---------- y= (SSRC) ----------
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else if (line.startsWith("y=")) {
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// y=0700000038
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info.setSsrc(Long.parseLong(line.substring(2)));
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}
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// ---------- 其他属性 ----------
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else if (line.startsWith("a=")) {
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int idx = line.indexOf(':');
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if (idx > 0) {
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info.putAttribute(
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line.substring(2, idx),
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line.substring(idx + 1)
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);
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}
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}
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}
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return info;
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}
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}
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