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# include/ortp/rtcp.h

    00001 /*
    00002   The oRTP library is an RTP (Realtime Transport Protocol - rfc3550) stack.
    00003   Copyright (C) 2001  Simon MORLAT simon.morlat@linphone.org
    00004
    00005   This library is free software; you can redistribute it and/or
    00006   modify it under the terms of the GNU Lesser General Public
    00007   License as published by the Free Software Foundation; either
    00008   version 2.1 of the License, or (at your option) any later version.
    00009
    00010   This library is distributed in the hope that it will be useful,
    00011   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013   Lesser General Public License for more details.
    00014
    00015   You should have received a copy of the GNU Lesser General Public
    00016   License along with this library; if not, write to the Free Software
    00017   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00018 */
    00019
    00020
    00021 #ifndef RTCP_H
    00022 #define RTCP_H
    00023
    00024 #include <ortp/port.h>
    00025
    00026 #define RTCP_MAX_RECV_BUFSIZE 1024
    00027
    00028 #define RTCP_SENDER_INFO_SIZE 20
    00029 #define RTCP_REPORT_BLOCK_SIZE 24
    00030 #define RTCP_COMMON_HEADER_SIZE 4
    00031 #define RTCP_SSRC_FIELD_SIZE 4
    00032
    00033 #ifdef __cplusplus
    00034 extern "C"{
    00035 #endif
    00036
    00037 /* RTCP common header */
    00038
    00039 typedef enum {
    00040     RTCP_SR     = 200,
    00041     RTCP_RR     = 201,
    00042     RTCP_SDES   = 202,
    00043     RTCP_BYE    = 203,
    00044     RTCP_APP    = 204
    00045 } rtcp_type_t;
    00046
    00047
    00048 typedef struct rtcp_common_header
    00049 {
    00050 #ifdef ORTP_BIGENDIAN
    00051         uint16_t version:2;
    00052         uint16_t padbit:1;
    00053         uint16_t rc:5;
    00054         uint16_t packet_type:8;
    00055 #else
    00056         uint16_t rc:5;
    00057         uint16_t padbit:1;
    00058         uint16_t version:2;
    00059         uint16_t packet_type:8;
    00060 #endif
    00061         uint16_t length:16;
    00062 } rtcp_common_header_t;
    00063
    00064 #define rtcp_common_header_set_version(ch,v) (ch)->version=v
    00065 #define rtcp_common_header_set_padbit(ch,p) (ch)->padbit=p
    00066 #define rtcp_common_header_set_rc(ch,rc) (ch)->rc=rc
    00067 #define rtcp_common_header_set_packet_type(ch,pt) (ch)->packet_type=pt
    00068 #define rtcp_common_header_set_length(ch,l)     (ch)->length=htons(l)
    00069
    00070 #define rtcp_common_header_get_version(ch) ((ch)->version)
    00071 #define rtcp_common_header_get padbit(ch) ((ch)->padbit)
    00072 #define rtcp_common_header_get_rc(ch) ((ch)->rc)
    00073 #define rtcp_common_header_get_packet_type(ch) ((ch)->packet_type)
    00074 #define rtcp_common_header_get_length(ch)       ntohs((ch)->length)
    00075
    00076
    00077 /* SR or RR  packets */
    00078
    00079 typedef struct sender_info
    00080 {
    00081         uint32_t ntp_timestamp_msw;
    00082         uint32_t ntp_timestamp_lsw;
    00083         uint32_t rtp_timestamp;
    00084         uint32_t senders_packet_count;
    00085         uint32_t senders_octet_count;
    00086 } sender_info_t;
    00087
    00088 uint64_t sender_info_get_ntp_timestamp(const sender_info_t *si);
    00089 #define sender_info_get_rtp_timestamp(si)       ((si)->rtp_timestamp)
    00090 #define sender_info_get_packet_count(si) \
    00091         ntohl((si)->senders_packet_count)
    00092 #define sender_info_get_octet_count(si) \
    00093         ntohl((si)->senders_octet_count)
    00094
    00095
    00096 typedef struct report_block
    00097 {
    00098         uint32_t ssrc;
    00099         uint32_t fl_cnpl;/*fraction lost + cumulative number of packet lost*/
    00100         uint32_t ext_high_seq_num_rec; /*extended highest sequence number received */
    00101         uint32_t interarrival_jitter;
    00102         uint32_t lsr; /*last SR */
    00103         uint32_t delay_snc_last_sr; /*delay since last sr*/
    00104 } report_block_t;
    00105
    00106 #define report_block_get_ssrc(rb) \
    00107         ntohl((rb)->ssrc)
    00108 #define report_block_get_fraction_lost(rb) \
    00109         (((uint32_t)ntohl((rb)->fl_cnpl))>>24)
    00110 #define report_block_get_cum_packet_loss(rb) \
    00111         (((uint32_t)ntohl((rb)->fl_cnpl)) & 0xFFFFFF)
    00112 #define report_block_get_high_ext_seq(rb) \
    00113         ntohl(((report_block_t*)(rb))->ext_high_seq_num_rec)
    00114 #define report_block_get_interarrival_jitter(rb) \
    00115         ntohl(((report_block_t*)(rb))->interarrival_jitter)
    00116 #define report_block_get_last_SR_time(rb) \
    00117         ntohl(((report_block_t*)(rb))->lsr)
    00118 #define report_block_get_last_SR_delay(rb) \
    00119         ntohl(((report_block_t*)(rb))->delay_snc_last_sr)
    00120
    00121 #define report_block_set_fraction_lost(rb,fl)\
    00122         ((rb)->fl_cnpl)=htonl( (ntohl((rb)->fl_cnpl) & 0xFFFFFF) | (((fl) & 0xFF)<<24))
    00123
    00124 #define report_block_set_cum_packet_lost(rb,cpl)\
    00125         ((rb)->fl_cnpl)=htonl( (ntohl((rb)->fl_cnpl) & 0xFF000000) | (((cpl) & 0xFFFFFF)))
    00126
    00127 /* SDES packets */
    00128
    00129 typedef enum {
    00130     RTCP_SDES_END               = 0,
    00131     RTCP_SDES_CNAME     = 1,
    00132     RTCP_SDES_NAME      = 2,
    00133     RTCP_SDES_EMAIL     = 3,
    00134     RTCP_SDES_PHONE     = 4,
    00135     RTCP_SDES_LOC               = 5,
    00136     RTCP_SDES_TOOL      = 6,
    00137     RTCP_SDES_NOTE      = 7,
    00138     RTCP_SDES_PRIV              = 8,
    00139     RTCP_SDES_MAX               = 9
    00140 } rtcp_sdes_type_t;
    00141
    00142 typedef struct sdes_chunk
    00143 {
    00144         uint32_t csrc;
    00145 } sdes_chunk_t;
    00146
    00147
    00148 #define sdes_chunk_get_csrc(c)  ntohl((c)->csrc)
    00149
    00150 typedef struct sdes_item
    00151 {
    00152         uint8_t item_type;
    00153         uint8_t len;
    00154         char content[1];
    00155 } sdes_item_t;
    00156
    00157 #define RTCP_SDES_MAX_STRING_SIZE 255
    00158 #define RTCP_SDES_ITEM_HEADER_SIZE 2
    00159 #define RTCP_SDES_CHUNK_DEFAULT_SIZE 1024
    00160 #define RTCP_SDES_CHUNK_HEADER_SIZE (sizeof(sdes_chunk_t))
    00161
    00162 /* RTCP bye packet */
    00163
    00164 typedef struct rtcp_bye_reason
    00165 {
    00166         uint8_t len;
    00167         char content[1];
    00168 } rtcp_bye_reason_t;
    00169
    00170 typedef struct rtcp_bye
    00171 {
    00172         rtcp_common_header_t ch;
    00173         uint32_t ssrc[1];  /* the bye may contain several ssrc/csrc */
    00174 } rtcp_bye_t;
    00175 #define RTCP_BYE_HEADER_SIZE sizeof(rtcp_bye_t)
    00176 #define RTCP_BYE_REASON_MAX_STRING_SIZE 255
    00177
    00178
    00179
    00180 typedef struct rtcp_sr{
    00181         rtcp_common_header_t ch;
    00182         uint32_t ssrc;
    00183         sender_info_t si;
    00184         report_block_t rb[1];
    00185 } rtcp_sr_t;
    00186
    00187 typedef struct rtcp_rr{
    00188         rtcp_common_header_t ch;
    00189         uint32_t ssrc;
    00190         report_block_t rb[1];
    00191 } rtcp_rr_t;
    00192
    00193 typedef struct rtcp_app{
    00194         rtcp_common_header_t ch;
    00195         uint32_t ssrc;
    00196         char name[4];
    00197 } rtcp_app_t;
    00198
    00199 struct _RtpSession;
    00200 void rtp_session_rtcp_process_send(struct _RtpSession *s);
    00201 void rtp_session_rtcp_process_recv(struct _RtpSession *s);
    00202
    00203 #define RTCP_DEFAULT_REPORT_INTERVAL 5
    00204
    00205
    00206 /* packet parsing api */
    00207
    00208 /*in case of coumpound packet, set read pointer of m to the beginning of the next RTCP
    00209 packet */
    00210 bool_t rtcp_next_packet(mblk_t *m);
    00211 /* put the read pointer at the first RTCP packet of the compound packet (as before any previous calls ot rtcp_next_packet() */
    00212 void rtcp_rewind(mblk_t *m);
    00213 /* get common header*/
    00214 const rtcp_common_header_t * rtcp_get_common_header(const mblk_t *m);
    00215
    00216 /*Sender Report accessors */
    00217 /* check if this packet is a SR and if it is correct */
    00218 bool_t rtcp_is_SR(const mblk_t *m);
    00219 uint32_t rtcp_SR_get_ssrc(const mblk_t *m);
    00220 const sender_info_t * rtcp_SR_get_sender_info(const mblk_t *m);
    00221 const report_block_t * rtcp_SR_get_report_block(const mblk_t *m, int idx);
    00222
    00223 /*Receiver report accessors*/
    00224 bool_t rtcp_is_RR(const mblk_t *m);
    00225 uint32_t rtcp_RR_get_ssrc(const mblk_t *m);
    00226 const report_block_t * rtcp_RR_get_report_block(const mblk_t *m,int idx);
    00227
    00228 /*SDES accessors */
    00229 bool_t rtcp_is_SDES(const mblk_t *m);
    00230 typedef void (*SdesItemFoundCallback)(void *user_data, uint32_t csrc, rtcp_sdes_type_t t, const char *content, uint8_t content_len);
    00231 void rtcp_sdes_parse(const mblk_t *m, SdesItemFoundCallback cb, void *user_data);
    00232
    00233 /*BYE accessors */
    00234 bool_t rtcp_is_BYE(const mblk_t *m);
    00235 bool_t rtcp_BYE_get_ssrc(const mblk_t *m, int idx, uint32_t *ssrc);
    00236 bool_t rtcp_BYE_get_reason(const mblk_t *m, const char **reason, int *reason_len);
    00237
    00238 /*APP accessors */
    00239 bool_t rtcp_is_APP(const mblk_t *m);
    00240 int rtcp_APP_get_subtype(const mblk_t *m);
    00241 uint32_t rtcp_APP_get_ssrc(const mblk_t *m);
    00242 /* name argument is supposed to be at least 4 characters (note: no '\0' written)*/
    00243 void rtcp_APP_get_name(const mblk_t *m, char *name);
    00244 /* retrieve the data. when returning, data points directly into the mblk_t */
    00245 void rtcp_APP_get_data(const mblk_t *m, uint8_t **data, int *len);
    00246
    00247
    00248 #ifdef __cplusplus
    00249 }
    00250 #endif
    00251
    00252 #endif