[457] | 1 | /**
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| 2 | * @file
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| 3 | * RTP client/server module
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| 4 | *
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Redistribution and use in source and binary forms, with or without modification,
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| 9 | * are permitted provided that the following conditions are met:
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| 10 | *
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| 11 | * 1. Redistributions of source code must retain the above copyright notice,
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| 12 | * this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 14 | * this list of conditions and the following disclaimer in the documentation
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| 15 | * and/or other materials provided with the distribution.
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| 16 | * 3. The name of the author may not be used to endorse or promote products
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| 17 | * derived from this software without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 20 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 22 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 23 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 24 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 27 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 28 | * OF SUCH DAMAGE.
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| 29 | *
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| 30 | * This file is part of the lwIP TCP/IP stack.
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| 31 | *
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| 32 | */
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| 33 |
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| 34 | #include "lwip/opt.h"
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| 35 |
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| 36 | #if LWIP_SOCKET && LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
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| 37 |
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| 38 | #include "lwip/sys.h"
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| 39 | #include "lwip/sockets.h"
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| 40 |
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| 41 | #include "rtp.h"
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| 42 |
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| 43 | #include "rtpdata.h"
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| 44 |
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| 45 | #include <string.h>
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| 46 |
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| 47 | /** This is an example of a "RTP" client/server based on a MPEG4 bitstream (with socket API).
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| 48 | */
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| 49 |
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| 50 | /**
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| 51 | * RTP_DEBUG: Enable debugging for RTP.
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| 52 | */
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| 53 | #ifndef RTP_DEBUG
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| 54 | #define RTP_DEBUG LWIP_DBG_ON
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| 55 | #endif
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| 56 |
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| 57 | /** RTP stream port */
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| 58 | #ifndef RTP_STREAM_PORT
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| 59 | #define RTP_STREAM_PORT 4000
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| 60 | #endif
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| 61 |
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| 62 | /** RTP stream multicast address as IPv4 address in "u32_t" format */
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| 63 | #ifndef RTP_STREAM_ADDRESS
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| 64 | #define RTP_STREAM_ADDRESS inet_addr("232.0.0.0")
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| 65 | #endif
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| 66 |
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| 67 | /** RTP send delay - in milliseconds */
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| 68 | #ifndef RTP_SEND_DELAY
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| 69 | #define RTP_SEND_DELAY 40
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| 70 | #endif
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| 71 |
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| 72 | /** RTP receive timeout - in milliseconds */
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| 73 | #ifndef RTP_RECV_TIMEOUT
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| 74 | #define RTP_RECV_TIMEOUT 2000
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| 75 | #endif
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| 76 |
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| 77 | /** RTP stats display period - in received packets */
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| 78 | #ifndef RTP_RECV_STATS
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| 79 | #define RTP_RECV_STATS 50
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| 80 | #endif
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| 81 |
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| 82 | /** RTP macro to let the application process the data */
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| 83 | #ifndef RTP_RECV_PROCESSING
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| 84 | #define RTP_RECV_PROCESSING(p,s)
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| 85 | #endif
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| 86 |
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| 87 | /** RTP packet/payload size */
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| 88 | #define RTP_PACKET_SIZE 1500
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| 89 | #define RTP_PAYLOAD_SIZE 1024
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| 90 |
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| 91 | /** RTP header constants */
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| 92 | #define RTP_VERSION 0x80
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| 93 | #define RTP_TIMESTAMP_INCREMENT 3600
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| 94 | #define RTP_SSRC 0
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| 95 | #define RTP_PAYLOADTYPE 96
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| 96 | #define RTP_MARKER_MASK 0x80
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| 97 |
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| 98 | /** RTP message header */
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| 99 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 100 | # include "arch/bpstruct.h"
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| 101 | #endif
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| 102 | PACK_STRUCT_BEGIN
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| 103 | struct rtp_hdr {
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| 104 | PACK_STRUCT_FLD_8(u8_t version);
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| 105 | PACK_STRUCT_FLD_8(u8_t payloadtype);
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| 106 | PACK_STRUCT_FIELD(u16_t seqNum);
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| 107 | PACK_STRUCT_FIELD(u32_t timestamp);
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| 108 | PACK_STRUCT_FIELD(u32_t ssrc);
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| 109 | } PACK_STRUCT_STRUCT;
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| 110 | PACK_STRUCT_END
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| 111 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 112 | # include "arch/epstruct.h"
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| 113 | #endif
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| 114 |
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| 115 | /** RTP packets */
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| 116 | static u8_t rtp_send_packet[RTP_PACKET_SIZE];
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| 117 | static u8_t rtp_recv_packet[RTP_PACKET_SIZE];
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| 118 |
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| 119 | /**
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| 120 | * RTP send packets
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| 121 | */
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| 122 | static void
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| 123 | rtp_send_packets( int sock, struct sockaddr_in* to)
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| 124 | {
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| 125 | struct rtp_hdr* rtphdr;
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| 126 | u8_t* rtp_payload;
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| 127 | size_t rtp_payload_size;
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| 128 | size_t rtp_data_index;
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| 129 |
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| 130 | /* prepare RTP packet */
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| 131 | rtphdr = (struct rtp_hdr*)rtp_send_packet;
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| 132 | rtphdr->version = RTP_VERSION;
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| 133 | rtphdr->payloadtype = 0;
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| 134 | rtphdr->ssrc = PP_HTONL(RTP_SSRC);
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| 135 | rtphdr->timestamp = lwip_htonl(lwip_ntohl(rtphdr->timestamp) + RTP_TIMESTAMP_INCREMENT);
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| 136 |
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| 137 | /* send RTP stream packets */
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| 138 | rtp_data_index = 0;
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| 139 | do {
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| 140 | rtp_payload = rtp_send_packet+sizeof(struct rtp_hdr);
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| 141 | rtp_payload_size = LWIP_MIN(RTP_PAYLOAD_SIZE, sizeof(rtp_data) - rtp_data_index);
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| 142 |
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| 143 | MEMCPY(rtp_payload, rtp_data + rtp_data_index, rtp_payload_size);
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| 144 |
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| 145 | /* set MARKER bit in RTP header on the last packet of an image */
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| 146 | if ((rtp_data_index + rtp_payload_size) >= sizeof(rtp_data)) {
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| 147 | rtphdr->payloadtype = RTP_PAYLOADTYPE | RTP_MARKER_MASK;
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| 148 | } else {
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| 149 | rtphdr->payloadtype = RTP_PAYLOADTYPE;
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| 150 | }
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| 151 |
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| 152 | /* send RTP stream packet */
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| 153 | if (lwip_sendto(sock, rtp_send_packet, sizeof(struct rtp_hdr) + rtp_payload_size,
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| 154 | 0, (struct sockaddr *)to, sizeof(struct sockaddr)) >= 0) {
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| 155 | rtphdr->seqNum = lwip_htons((u16_t)(lwip_ntohs(rtphdr->seqNum) + 1));
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| 156 | rtp_data_index += rtp_payload_size;
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| 157 | } else {
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| 158 | LWIP_DEBUGF(RTP_DEBUG, ("rtp_sender: not sendto==%i\n", errno));
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| 159 | }
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| 160 | }while (rtp_data_index < sizeof(rtp_data));
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| 161 | }
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| 162 |
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| 163 | /**
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| 164 | * RTP send thread
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| 165 | */
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| 166 | static void
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| 167 | rtp_send_thread(void *arg)
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| 168 | {
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| 169 | int sock;
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| 170 | struct sockaddr_in local;
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| 171 | struct sockaddr_in to;
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| 172 | u32_t rtp_stream_address;
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| 173 |
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| 174 | LWIP_UNUSED_ARG(arg);
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| 175 |
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| 176 | /* initialize RTP stream address */
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| 177 | rtp_stream_address = RTP_STREAM_ADDRESS;
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| 178 |
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| 179 | /* if we got a valid RTP stream address... */
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| 180 | if (rtp_stream_address != 0) {
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| 181 | /* create new socket */
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| 182 | sock = lwip_socket(AF_INET, SOCK_DGRAM, 0);
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| 183 | if (sock >= 0) {
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| 184 | /* prepare local address */
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| 185 | memset(&local, 0, sizeof(local));
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| 186 | local.sin_family = AF_INET;
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| 187 | local.sin_port = PP_HTONS(INADDR_ANY);
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| 188 | local.sin_addr.s_addr = PP_HTONL(INADDR_ANY);
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| 189 |
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| 190 | /* bind to local address */
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| 191 | if (lwip_bind(sock, (struct sockaddr *)&local, sizeof(local)) == 0) {
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| 192 | /* prepare RTP stream address */
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| 193 | memset(&to, 0, sizeof(to));
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| 194 | to.sin_family = AF_INET;
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| 195 | to.sin_port = PP_HTONS(RTP_STREAM_PORT);
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| 196 | to.sin_addr.s_addr = rtp_stream_address;
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| 197 |
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| 198 | /* send RTP packets */
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| 199 | memset(rtp_send_packet, 0, sizeof(rtp_send_packet));
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| 200 | while (1) {
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| 201 | rtp_send_packets( sock, &to);
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| 202 | sys_msleep(RTP_SEND_DELAY);
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| 203 | }
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| 204 | }
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| 205 |
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| 206 | /* close the socket */
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| 207 | lwip_close(sock);
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| 208 | }
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| 209 | }
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| 210 | }
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| 211 |
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| 212 | /**
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| 213 | * RTP recv thread
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| 214 | */
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| 215 | static void
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| 216 | rtp_recv_thread(void *arg)
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| 217 | {
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| 218 | int sock;
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| 219 | struct sockaddr_in local;
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| 220 | struct sockaddr_in from;
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| 221 | int fromlen;
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| 222 | struct ip_mreq ipmreq;
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| 223 | struct rtp_hdr* rtphdr;
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| 224 | u32_t rtp_stream_address;
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| 225 | int timeout;
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| 226 | int result;
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| 227 | int recvrtppackets = 0;
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| 228 | int lostrtppackets = 0;
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| 229 | u16_t lastrtpseq = 0;
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| 230 |
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| 231 | LWIP_UNUSED_ARG(arg);
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| 232 |
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| 233 | /* initialize RTP stream address */
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| 234 | rtp_stream_address = RTP_STREAM_ADDRESS;
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| 235 |
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| 236 | /* if we got a valid RTP stream address... */
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| 237 | if (rtp_stream_address != 0) {
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| 238 | /* create new socket */
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| 239 | sock = lwip_socket(AF_INET, SOCK_DGRAM, 0);
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| 240 | if (sock >= 0) {
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| 241 | /* prepare local address */
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| 242 | memset(&local, 0, sizeof(local));
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| 243 | local.sin_family = AF_INET;
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| 244 | local.sin_port = PP_HTONS(RTP_STREAM_PORT);
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| 245 | local.sin_addr.s_addr = PP_HTONL(INADDR_ANY);
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| 246 |
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| 247 | /* bind to local address */
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| 248 | if (lwip_bind(sock, (struct sockaddr *)&local, sizeof(local)) == 0) {
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| 249 | /* set recv timeout */
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| 250 | timeout = RTP_RECV_TIMEOUT;
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| 251 | result = lwip_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
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| 252 | if (result) {
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| 253 | LWIP_DEBUGF(RTP_DEBUG, ("rtp_recv_thread: setsockopt(SO_RCVTIMEO) failed: errno=%d\n", errno));
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| 254 | }
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| 255 |
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| 256 | /* prepare multicast "ip_mreq" struct */
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| 257 | ipmreq.imr_multiaddr.s_addr = rtp_stream_address;
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| 258 | ipmreq.imr_interface.s_addr = PP_HTONL(INADDR_ANY);
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| 259 |
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| 260 | /* join multicast group */
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| 261 | if (lwip_setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &ipmreq, sizeof(ipmreq)) == 0) {
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| 262 | /* receive RTP packets */
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| 263 | while(1) {
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| 264 | fromlen = sizeof(from);
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| 265 | result = lwip_recvfrom(sock, rtp_recv_packet, sizeof(rtp_recv_packet), 0,
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| 266 | (struct sockaddr *)&from, (socklen_t *)&fromlen);
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| 267 | if ((result > 0) && ((size_t)result >= sizeof(struct rtp_hdr))) {
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| 268 | size_t recved = (size_t)result;
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| 269 | rtphdr = (struct rtp_hdr *)rtp_recv_packet;
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| 270 | recvrtppackets++;
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| 271 | if ((lastrtpseq == 0) || ((lastrtpseq + 1) == lwip_ntohs(rtphdr->seqNum))) {
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| 272 | RTP_RECV_PROCESSING((rtp_recv_packet + sizeof(rtp_hdr)), (recved-sizeof(rtp_hdr)));
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| 273 | LWIP_UNUSED_ARG(recved); /* just in case... */
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| 274 | } else {
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| 275 | lostrtppackets++;
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| 276 | }
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| 277 | lastrtpseq = lwip_ntohs(rtphdr->seqNum);
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| 278 | if ((recvrtppackets % RTP_RECV_STATS) == 0) {
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| 279 | LWIP_DEBUGF(RTP_DEBUG, ("rtp_recv_thread: recv %6i packet(s) / lost %4i packet(s) (%.4f%%)...\n", recvrtppackets, lostrtppackets, (lostrtppackets*100.0)/recvrtppackets));
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| 280 | }
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| 281 | } else {
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| 282 | LWIP_DEBUGF(RTP_DEBUG, ("rtp_recv_thread: recv timeout...\n"));
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| 283 | }
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| 284 | }
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| 285 |
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| 286 | /* leave multicast group */
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| 287 | /* TODO: this code is never reached
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| 288 | result = lwip_setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, &ipmreq, sizeof(ipmreq));
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| 289 | if (result) {
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| 290 | LWIP_DEBUGF(RTP_DEBUG, ("rtp_recv_thread: setsockopt(IP_DROP_MEMBERSHIP) failed: errno=%d\n", errno));
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| 291 | }*/
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| 292 | }
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| 293 | }
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| 294 |
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| 295 | /* close the socket */
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| 296 | lwip_close(sock);
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| 297 | }
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| 298 | }
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| 299 | }
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| 300 |
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| 301 | void
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| 302 | rtp_init(void)
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| 303 | {
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| 304 | sys_thread_new("rtp_send_thread", rtp_send_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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| 305 | sys_thread_new("rtp_recv_thread", rtp_recv_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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| 306 | }
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| 307 |
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| 308 | #endif /* LWIP_SOCKET && LWIP_IGMP */
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