java、android可用的rtp封包解包h264案例
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2022-07-09 16:51:13
做直播,音视频通讯。经常需要通过rtp协议封装音视频数据来发送。网上找到的基本都是c或c++版本的,没有java版本的。就算千辛万苦找到一篇java版本的,要么不能用,要么就是一些片段,要么有封包没解...
做直播,音视频通讯。经常需要通过rtp协议封装音视频数据来发送。网上找到的基本都是c或c++版本的,没有java版本的。就算千辛万苦找到一篇java版本的,要么不能用,要么就是一些片段,要么有封包没解包。
很是蛋疼,本人也是这样,刚开始不太熟悉rtp协议,不太明白怎么封包组包,痛苦了几天,终于搞出来了,分享给有需要的朋友,希望对你们有所帮助。
直接看代码吧。不多说了。
首先看看关键类:
package com.imsdk.socket.udp.codec; import android.os.systemclock; import android.util.log; import java.io.bytearrayinputstream; import java.io.ioexception; import java.io.inputstream; import java.math.bigdecimal; import java.util.random; import java.util.concurrent.semaphore; public class rtsppacketencode { private static final string tag = "rtsppacketencode"; //------------视频转换数据监听----------- public interface h264tortplinsener { void h264tortpresponse(byte[] out, int len); } private h264tortplinsener h264tortplinsener; //执行回调 private void exceuteh264tortplinsener(byte[] out, int len) { if (this.h264tortplinsener != null) { h264tortplinsener.h264tortpresponse(out, len); } } // -------视频-------- private int framerate = 10; private byte[] sendbuf = new byte[1500]; private int packagesize = 1400; private int seq_num = 0; private int timestamp_increse = (int) (90000.0 / framerate);//framerate是帧率 private int ts_current = 0; private int bytes = 0; // -------视频end-------- public rtsppacketencode(h264tortplinsener h264tortplinsener) { this.h264tortplinsener = h264tortplinsener; } /** * 一帧一帧的rtp封包 * * @param r * @return */ public void h264tortp(byte[] r, int h264len) throws exception { calculateutil.memset(sendbuf, 0, 1500); sendbuf[1] = (byte) (sendbuf[1] | 96); // 负载类型号96,其值为:01100000 sendbuf[0] = (byte) (sendbuf[0] | 0x80); // 版本号,此版本固定为2 sendbuf[1] = (byte) (sendbuf[1] & 254); //标志位,由具体协议规定其值,其值为:01100000 sendbuf[11] = 10;//随机指定10,并在本rtp回话中全局唯一,java默认采用网络字节序号 不用转换(同源标识符的最后一个字节) if (h264len <= packagesize) { sendbuf[1] = (byte) (sendbuf[1] | 0x80); // 设置rtp m位为1,其值为:11100000,分包的最后一片,m位(第一位)为0,后7位是十进制的96,表示负载类型 sendbuf[3] = (byte) seq_num++; system.arraycopy(calculateutil.inttobyte(seq_num++), 0, sendbuf, 2, 2);//send[2]和send[3]为序列号,共两位 { // java默认的网络字节序是大端字节序(无论在什么平台上),因为windows为小字节序,所以必须倒序 /**参考: * http://blog.csdn.net/u011068702/article/details/51857557 * http://cpjsjxy.iteye.com/blog/1591261 */ byte temp = 0; temp = sendbuf[3]; sendbuf[3] = sendbuf[2]; sendbuf[2] = temp; } // fu-a header, 并将这个header填入sendbuf[12] sendbuf[12] = (byte) (sendbuf[12] | ((byte) (r[0] & 0x80)) << 7); sendbuf[12] = (byte) (sendbuf[12] | ((byte) ((r[0] & 0x60) >> 5)) << 5); sendbuf[12] = (byte) (sendbuf[12] | ((byte) (r[0] & 0x1f))); // 同理将sendbuf[13]赋给nalu_payload //nalu头已经写到sendbuf[12]中,接下来则存放的是nal的第一个字节之后的数据。所以从r的第二个字节开始复制 system.arraycopy(r, 1, sendbuf, 13, h264len - 1); ts_current = ts_current + timestamp_increse; system.arraycopy(calculateutil.inttobyte(ts_current), 0, sendbuf, 4, 4);//序列号接下来是时间戳,4个字节,存储后也需要倒序 { byte temp = 0; temp = sendbuf[4]; sendbuf[4] = sendbuf[7]; sendbuf[7] = temp; temp = sendbuf[5]; sendbuf[5] = sendbuf[6]; sendbuf[6] = temp; } bytes = h264len + 12;//获sendbuf的长度,为nalu的长度(包含nalu头但取出起始前缀,加上rtp_header固定长度12个字节) //client.send(new datagrampacket(sendbuf, bytes, addr, port/*9200*/)); //send(sendbuf,bytes); exceuteh264tortplinsener(sendbuf, bytes); } else if (h264len > packagesize) { int k = 0, l = 0; k = h264len / packagesize; l = h264len % packagesize; int t = 0; ts_current = ts_current + timestamp_increse; system.arraycopy(calculateutil.inttobyte(ts_current), 0, sendbuf, 4, 4);//时间戳,并且倒序 { byte temp = 0; temp = sendbuf[4]; sendbuf[4] = sendbuf[7]; sendbuf[7] = temp; temp = sendbuf[5]; sendbuf[5] = sendbuf[6]; sendbuf[6] = temp; } while (t <= k) { system.arraycopy(calculateutil.inttobyte(seq_num++), 0, sendbuf, 2, 2);//序列号,并且倒序 { byte temp = 0; temp = sendbuf[3]; sendbuf[3] = sendbuf[2]; sendbuf[2] = temp; } if (t == 0) {//分包的第一片 sendbuf[1] = (byte) (sendbuf[1] & 0x7f);//其值为:01100000,不是最后一片,m位(第一位)设为0 //fu indicator,一个字节,紧接在rtp header之后,包括f,nri,header sendbuf[12] = (byte) (sendbuf[12] | ((byte) (r[0] & 0x80)) << 7);//禁止位,为0 sendbuf[12] = (byte) (sendbuf[12] | ((byte) ((r[0] & 0x60) >> 5)) << 5);//nri,表示包的重要性 sendbuf[12] = (byte) (sendbuf[12] | (byte) (28));//type,表示此fu-a包为什么类型,一般此处为28 //fu header,一个字节,s,e,r,type sendbuf[13] = (byte) (sendbuf[13] & 0xbf);//e=0,表示是否为最后一个包,是则为1 sendbuf[13] = (byte) (sendbuf[13] & 0xdf);//r=0,保留位,必须设置为0 sendbuf[13] = (byte) (sendbuf[13] | 0x80);//s=1,表示是否为第一个包,是则为1 sendbuf[13] = (byte) (sendbuf[13] | ((byte) (r[0] & 0x1f)));//type,即nalu头对应的type //将除去nalu头剩下的nalu数据写入sendbuf的第14个字节之后。前14个字节包括:12字节的rtp header,fu indicator,fu header system.arraycopy(r, 1, sendbuf, 14, packagesize); //client.send(new datagrampacket(sendbuf, packagesize + 14, addr, port/*9200*/)); exceuteh264tortplinsener(sendbuf, packagesize + 14); t++; } else if (t == k) {//分片的最后一片 sendbuf[1] = (byte) (sendbuf[1] | 0x80); sendbuf[12] = (byte) (sendbuf[12] | ((byte) (r[0] & 0x80)) << 7); sendbuf[12] = (byte) (sendbuf[12] | ((byte) ((r[0] & 0x60) >> 5)) << 5); sendbuf[12] = (byte) (sendbuf[12] | (byte) (28)); sendbuf[13] = (byte) (sendbuf[13] & 0xdf); //r=0,保留位必须设为0 sendbuf[13] = (byte) (sendbuf[13] & 0x7f); //s=0,不是第一个包 sendbuf[13] = (byte) (sendbuf[13] | 0x40); //e=1,是最后一个包 sendbuf[13] = (byte) (sendbuf[13] | ((byte) (r[0] & 0x1f)));//nalu头对应的type if (0 != l) {//如果不能整除,则有剩下的包,执行此代码。如果包大小恰好是1400的倍数,不执行此代码。 system.arraycopy(r, t * packagesize + 1, sendbuf, 14, l - 1);//l-1,不包含nalu头 bytes = l - 1 + 14; //bytes=l-1+14; //client.send(new datagrampacket(sendbuf, bytes, addr, port/*9200*/)); //send(sendbuf,bytes); exceuteh264tortplinsener(sendbuf, bytes); }//pl t++; } else if (t < k && 0 != t) {//既不是第一片,又不是最后一片的包 sendbuf[1] = (byte) (sendbuf[1] & 0x7f); //m=0,其值为:01100000,不是最后一片,m位(第一位)设为0. sendbuf[12] = (byte) (sendbuf[12] | ((byte) (r[0] & 0x80)) << 7); sendbuf[12] = (byte) (sendbuf[12] | ((byte) ((r[0] & 0x60) >> 5)) << 5); sendbuf[12] = (byte) (sendbuf[12] | (byte) (28)); sendbuf[13] = (byte) (sendbuf[13] & 0xdf); //r=0,保留位必须设为0 sendbuf[13] = (byte) (sendbuf[13] & 0x7f); //s=0,不是第一个包 sendbuf[13] = (byte) (sendbuf[13] & 0xbf); //e=0,不是最后一个包 sendbuf[13] = (byte) (sendbuf[13] | ((byte) (r[0] & 0x1f)));//nalu头对应的type system.arraycopy(r, t * packagesize + 1, sendbuf, 14, packagesize);//不包含nalu头 //client.send(new datagrampacket(sendbuf, packagesize + 14, addr, port/*9200*/)); //send(sendbuf,1414); exceuteh264tortplinsener(sendbuf, packagesize + 14); t++; } } } } }
计算类:
package com.imsdk.socket.udp.codec; /** * 计算类 * * @author kokjuis */ public class calculateutil { /** * 注释:int到字节数组的转换! * * @param number * @return */ public static byte[] inttobyte(int number) { int temp = number; byte[] b = new byte[4]; for (int i = 0; i < b.length; i++) { b[i] = new integer(temp & 0xff).bytevalue();// 将最低位保存在最低位 temp = temp >> 8; // 向右移8位 } return b; } public static int bytetoint(byte b) { //java 总是把 byte 当做有符处理;我们可以通过将其和 0xff 进行二进制与得到它的无符值 return b & 0xff; } //byte 数组与 int 的相互转换 public static int bytearraytoint(byte[] b) { return b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16 | (b[0] & 0xff) << 24; } public static byte[] inttobytearray(int a) { return new byte[] { (byte) ((a >> 24) & 0xff), (byte) ((a >> 16) & 0xff), (byte) ((a >> 8) & 0xff), (byte) (a & 0xff) }; } // 清空buf的值 public static void memset(byte[] buf, int value, int size) { for (int i = 0; i < size; i++) { buf[i] = (byte) value; } } public static void dump(nalu_t n) { system.out.println("len: " + n.len + " nal_unit_type:" + n.nal_unit_type); } // 判断是否为0x000001,如果是返回1 public static int findstartcode2(byte[] buf, int off) { if (buf[0 + off] != 0 || buf[1 + off] != 0 || buf[2 + off] != 1) return 0; else return 1; } // 判断是否为0x00000001,如果是返回1 public static int findstartcode3(byte[] buf, int off) { if (buf[0 + off] != 0 || buf[1 + off] != 0 || buf[2 + off] != 0 || buf[3 + off] != 1) return 0; else return 1; } }
使用的话,实现监听就可以了:
@override public void h264tortpresponse(byte[] out, int len) { //h264转rtp监听 if (out != null) { log.v(tag, "---发送数据---" + len); netsendtask.pushbuf(out, len); } } rtsppacketencode.h264tortp(h264, ret);
组包类:
package com.imsdk.socket.udp.codec; public class rtsppacketdecode { private byte[] h264buffer; private int h264len = 0; private int h264pos = 0; private static final byte[] start_code = {0, 0, 0, 1}; // h264 start code //传入视频的分辨率 public rtsppacketdecode(int width, int height) { h264buffer = new byte[getyuvbuffer(width, height)]; } /** * rtp解包h264 * * @param rtpdata * @return */ public byte[] rtp2h264(byte[] rtpdata, int rtplen) { int fu_header_len = 12; // fu-header长度为12字节 int extension = (rtpdata[0] & (1 << 4)); // x: 扩展为是否为1 if (extension > 0) { // 计算扩展头的长度 int extlen = (rtpdata[12] << 24) + (rtpdata[13] << 16) + (rtpdata[14] << 8) + rtpdata[15]; fu_header_len += (extlen + 1) * 4; } // 解析fu-indicator byte indicatortype = (byte) (calculateutil.bytetoint(rtpdata[fu_header_len]) & 0x1f); // 取出low 5 bit 则为fu-indicator type byte nri = (byte) ((calculateutil.bytetoint(rtpdata[fu_header_len]) >> 5) & 0x03); // 取出h2bit and h3bit byte f = (byte) (calculateutil.bytetoint(rtpdata[fu_header_len]) >> 7); // 取出h1bit byte h264_nal_header; byte fu_header; if (indicatortype == 28) { // fu-a fu_header = rtpdata[fu_header_len + 1]; byte s = (byte) (rtpdata[fu_header_len + 1] & 0x80); byte e = (byte) (rtpdata[fu_header_len + 1] & 0x40); if (e == 64) { // end of fu-a //zologutil.d("rtpparser", "end of fu-a.....;;;"); byte[] temp = new byte[rtplen - (fu_header_len + 2)]; system.arraycopy(rtpdata, fu_header_len + 2, temp, 0, temp.length); writedata2buffer(temp, temp.length); if (h264pos >= 0) { h264pos = -1; if (h264len > 0) { byte[] h264data = new byte[h264len]; system.arraycopy(h264buffer, 0, h264data, 0, h264len); h264len = 0; return h264data; } } } else if (s == -128) { // start of fu-a h264pos = 0; // 指针归0 writedata2buffer(start_code, 4); // 写入h264起始码 h264_nal_header = (byte) ((fu_header & 0x1f) | (nri << 5) | (f << 7)); writedata2buffer(new byte[]{h264_nal_header}, 1); byte[] temp = new byte[rtplen - (fu_header_len + 2)]; system.arraycopy(rtpdata, fu_header_len + 2, temp, 0, temp.length); // 负载数据 writedata2buffer(temp, temp.length); } else { byte[] temp = new byte[rtplen - (fu_header_len + 2)]; system.arraycopy(rtpdata, fu_header_len + 2, temp, 0, temp.length); writedata2buffer(temp, temp.length); } } else { // nalu h264pos = 0; writedata2buffer(start_code, 4); byte[] temp = new byte[rtplen - fu_header_len]; system.arraycopy(rtpdata, fu_header_len, temp, 0, temp.length); writedata2buffer(temp, temp.length); if (h264pos >= 0) { h264pos = -1; if (h264len > 0) { byte[] h264data = new byte[h264len]; system.arraycopy(h264buffer, 0, h264data, 0, h264len); h264len = 0; return h264data; } } } return null; } private void writedata2buffer(byte[] data, int len) { if (h264pos >= 0) { system.arraycopy(data, 0, h264buffer, h264pos, len); h264pos += len; h264len += len; } } //计算h264大小 public int getyuvbuffer(int width, int height) { // stride = align(width, 16) int stride = (int) math.ceil(width / 16.0) * 16; // y_size = stride * height int y_size = stride * height; // c_stride = align(stride/2, 16) int c_stride = (int) math.ceil(width / 32.0) * 16; // c_size = c_stride * height/2 int c_size = c_stride * height / 2; // size = y_size + c_size * 2 return y_size + c_size * 2; } }
使用:
byte[] tmp = rtsppacketdecode.rtp2h264(out,len);
以上这篇java、android可用的rtp封包解包h264案例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。
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