diff options
Diffstat (limited to 'pjmedia/src/pjmedia/sdp.c')
| -rw-r--r-- | pjmedia/src/pjmedia/sdp.c | 1898 |
1 files changed, 949 insertions, 949 deletions
diff --git a/pjmedia/src/pjmedia/sdp.c b/pjmedia/src/pjmedia/sdp.c index 1fe2b7b2..42a1fd4c 100644 --- a/pjmedia/src/pjmedia/sdp.c +++ b/pjmedia/src/pjmedia/sdp.c @@ -1,949 +1,949 @@ -/* $Id$ */
-/*
- * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <pjmedia/sdp.h>
-#include <pj/scanner.h>
-#include <pj/except.h>
-#include <pj/log.h>
-#include <pj/os.h>
-#include <pj/string.h>
-#include <pj/pool.h>
-
-enum {
- SKIP_WS = 0,
- SYNTAX_ERROR = 1,
-};
-#define TOKEN "-.!%*_=`'~"
-#define NTP_OFFSET ((pj_uint32_t)2208988800)
-#define LOG_THIS "sdp"
-
-/*
- * Prototypes for line parser.
- */
-static void parse_version(pj_scanner *scanner);
-static void parse_origin(pj_scanner *scanner, pjsdp_session_desc *ses);
-static void parse_time(pj_scanner *scanner, pjsdp_session_desc *ses);
-static void parse_generic_line(pj_scanner *scanner, pj_str_t *str);
-static void parse_connection_info(pj_scanner *scanner, pjsdp_conn_info *conn);
-static pjsdp_attr *parse_attr(pj_pool_t *pool, pj_scanner *scanner);
-static void parse_media(pj_scanner *scanner, pjsdp_media_desc *med);
-
-/*
- * Prototypes for attribute parsers.
- */
-static pjsdp_rtpmap_attr * parse_rtpmap_attr( pj_pool_t *pool, pj_scanner *scanner );
-static pjsdp_attr_string * parse_generic_string_attr( pj_pool_t *pool, pj_scanner *scanner );
-static pjsdp_attr_num * parse_generic_num_attr( pj_pool_t *pool, pj_scanner *scanner );
-static pjsdp_attr * parse_name_only_attr( pj_pool_t *pool, pj_scanner *scanner );
-static pjsdp_fmtp_attr * parse_fmtp_attr( pj_pool_t *pool, pj_scanner *scanner );
-
-
-/*
- * Prototypes for functions to print attribute.
- * All of them returns integer for the length printed, or -1 on error.
- */
-static int print_rtpmap_attr(const pjsdp_rtpmap_attr *attr,
- char *buf, int length);
-static int print_generic_string_attr(const pjsdp_attr_string *attr,
- char *buf, int length);
-static int print_generic_num_attr(const pjsdp_attr_num *attr,
- char *buf, int length);
-static int print_name_only_attr(const pjsdp_attr *attr,
- char *buf, int length);
-static int print_fmtp_attr(const pjsdp_fmtp_attr *attr,
- char *buf, int length);
-
-/*
- * Prototypes for cloning attributes.
- */
-static pjsdp_attr* clone_rtpmap_attr (pj_pool_t *pool, const pjsdp_attr *rhs);
-static pjsdp_attr* clone_generic_string_attr (pj_pool_t *pool, const pjsdp_attr *rhs);
-static pjsdp_attr* clone_generic_num_attr (pj_pool_t *pool, const pjsdp_attr *rhs);
-static pjsdp_attr* clone_name_only_attr (pj_pool_t *pool, const pjsdp_attr *rhs);
-static pjsdp_attr* clone_fmtp_attr (pj_pool_t *pool, const pjsdp_attr *rhs);
-
-
-/*
- * Prototypes
- */
-static void init_sdp_parser(void);
-
-
-typedef void * (*FPARSE)(pj_pool_t *pool, pj_scanner *scanner);
-typedef int (*FPRINT)(const void *attr, char *buf, int length);
-typedef pjsdp_attr* (*FCLONE)(pj_pool_t *pool, const pjsdp_attr *rhs);
-
-/*
- * Array of functions to print attribute.
- */
-static struct attr_map_rec
-{
- pj_str_t name;
- FPARSE parse_attr;
- FPRINT print_attr;
- FCLONE clone;
-} attr_map[] =
-{
- {{"rtpmap", 6}, (FPARSE)&parse_rtpmap_attr, (FPRINT)&print_rtpmap_attr, (FCLONE)&clone_rtpmap_attr},
- {{"cat", 3}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"keywds", 6}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"tool", 4}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"ptime", 5}, (FPARSE)&parse_generic_num_attr, (FPRINT)&print_generic_num_attr, (FCLONE)&clone_generic_num_attr},
- {{"recvonly", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr},
- {{"sendonly", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr},
- {{"sendrecv", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr},
- {{"orient", 6}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"type", 4}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"charset", 7}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"sdplang", 7}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"lang", 4}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"framerate", 9}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr},
- {{"quality", 7}, (FPARSE)&parse_generic_num_attr, (FPRINT)&print_generic_num_attr, (FCLONE)&clone_generic_num_attr},
- {{"fmtp", 4}, (FPARSE)&parse_fmtp_attr, (FPRINT)&print_fmtp_attr, (FCLONE)&clone_fmtp_attr},
- {{"inactive", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr},
- {{"", 0}, NULL, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}
-};
-
-/*
- * Scanner character specification.
- */
-static int is_initialized;
-static pj_char_spec cs_token;
-
-static void init_sdp_parser(void)
-{
- if (is_initialized == 0) {
- is_initialized = 1;
- if (is_initialized != 1) {
- return;
- }
- }
- pj_cs_add_alpha(cs_token);
- pj_cs_add_num(cs_token);
- pj_cs_add_str( cs_token, TOKEN);
-}
-
-static int print_rtpmap_attr(const pjsdp_rtpmap_attr *rtpmap,
- char *buf, int len)
-{
- char *p = buf;
-
- if (len < 16+rtpmap->encoding_name.slen+rtpmap->parameter.slen) {
- return -1;
- }
-
- /* colon and payload type. */
- *p++ = ':';
- len = pj_utoa(rtpmap->payload_type, p);
- p += len;
-
- /* space, encoding name */
- *p++ = ' ';
- pj_memcpy(p, rtpmap->encoding_name.ptr, rtpmap->encoding_name.slen);
- p += rtpmap->encoding_name.slen;
-
- /* slash, clock-rate. */
- *p++ = '/';
- len = pj_utoa(rtpmap->clock_rate, p);
- p += len;
-
- /* optionally add encoding parameter. */
- if (rtpmap->parameter.slen) {
- *p++ = '/';
- pj_memcpy(p, rtpmap->parameter.ptr, rtpmap->parameter.slen);
- p += rtpmap->parameter.slen;
- }
-
- return p-buf;
-}
-
-static int print_generic_string_attr(const pjsdp_attr_string *attr,
- char *buf, int len)
-{
- char *p = buf;
-
- if (len < attr->value.slen + 4) {
- return -1;
- }
-
- /* colon and attribute value. */
- *p++ = ':';
- pj_memcpy(p, attr->value.ptr, attr->value.slen);
- p += attr->value.slen;
-
- return p-buf;
-}
-
-static int print_generic_num_attr(const pjsdp_attr_num *attr, char *buf, int len)
-{
- char *p = buf;
-
- if (len < 10) {
- return -1;
- }
- *p++ = ':';
- return pj_utoa(attr->value, p);
-}
-
-static int print_name_only_attr(const pjsdp_attr *attr, char *buf, int len)
-{
- PJ_UNUSED_ARG(attr)
- PJ_UNUSED_ARG(buf)
- PJ_UNUSED_ARG(len)
- return 0;
-}
-
-static int print_fmtp_attr(const pjsdp_fmtp_attr *fmtp, char *buf, int len)
-{
- char *p = buf;
-
- if (len < 4+fmtp->format.slen+fmtp->param.slen) {
- return -1;
- }
-
- /* colon and format. */
- *p++ = ':';
- pj_memcpy(p, fmtp->format.ptr, fmtp->format.slen);
- p += fmtp->format.slen;
-
- /* space and parameter. */
- *p++ = ' ';
- pj_memcpy(p, fmtp->param.ptr, fmtp->param.slen);
- p += fmtp->param.slen;
-
- return p-buf;
-}
-
-
-static int print_attr(const pjsdp_attr *attr, char *buf, int len)
-{
- char *p = buf;
- struct attr_map_rec *desc = &attr_map[attr->type];
-
- if (len < 16) {
- return -1;
- }
-
- *p++ = 'a';
- *p++ = '=';
- pj_memcpy(p, desc->name.ptr, desc->name.slen);
- p += desc->name.slen;
-
- len = (*desc->print_attr)(attr, p, (buf+len)-p);
- if (len < 0) {
- return -1;
- }
- p += len;
- *p++ = '\r';
- *p++ = '\n';
- return p-buf;
-}
-
-static pjsdp_attr* clone_rtpmap_attr (pj_pool_t *pool, const pjsdp_attr *p)
-{
- const pjsdp_rtpmap_attr *rhs = (const pjsdp_rtpmap_attr*)p;
- pjsdp_rtpmap_attr *attr = pj_pool_alloc (pool, sizeof(pjsdp_rtpmap_attr));
- if (!attr)
- return NULL;
-
- attr->type = rhs->type;
- attr->payload_type = rhs->payload_type;
- if (!pj_strdup (pool, &attr->encoding_name, &rhs->encoding_name)) return NULL;
- attr->clock_rate = rhs->clock_rate;
- if (!pj_strdup (pool, &attr->parameter, &rhs->parameter)) return NULL;
-
- return (pjsdp_attr*)attr;
-}
-
-static pjsdp_attr* clone_generic_string_attr (pj_pool_t *pool, const pjsdp_attr *p)
-{
- const pjsdp_attr_string* rhs = (const pjsdp_attr_string*) p;
- pjsdp_attr_string *attr = pj_pool_alloc (pool, sizeof(pjsdp_attr_string));
- if (!attr)
- return NULL;
-
- attr->type = rhs->type;
- if (!pj_strdup (pool, &attr->value, &rhs->value)) return NULL;
-
- return (pjsdp_attr*)attr;
-}
-
-static pjsdp_attr* clone_generic_num_attr (pj_pool_t *pool, const pjsdp_attr *p)
-{
- const pjsdp_attr_num* rhs = (const pjsdp_attr_num*) p;
- pjsdp_attr_num *attr = pj_pool_alloc (pool, sizeof(pjsdp_attr_num));
- if (!attr)
- return NULL;
-
- attr->type = rhs->type;
- attr->value = rhs->value;
-
- return (pjsdp_attr*)attr;
-}
-
-static pjsdp_attr* clone_name_only_attr (pj_pool_t *pool, const pjsdp_attr *rhs)
-{
- pjsdp_attr *attr = pj_pool_alloc (pool, sizeof(pjsdp_attr));
- if (!attr)
- return NULL;
-
- attr->type = rhs->type;
- return attr;
-}
-
-static pjsdp_attr* clone_fmtp_attr (pj_pool_t *pool, const pjsdp_attr *p)
-{
- const pjsdp_fmtp_attr* rhs = (const pjsdp_fmtp_attr*) p;
- pjsdp_fmtp_attr *attr = pj_pool_alloc (pool, sizeof(pjsdp_fmtp_attr));
- if (!attr)
- return NULL;
-
- attr->type = rhs->type;
- if (!pj_strdup (pool, &attr->format, &rhs->format)) return NULL;
- if (!pj_strdup (pool, &attr->param, &rhs->param)) return NULL;
-
- return (pjsdp_attr*)attr;
-}
-
-PJ_DEF(pjsdp_attr*) pjsdp_attr_clone (pj_pool_t *pool, const pjsdp_attr *rhs)
-{
- struct attr_map_rec *desc;
-
- if (rhs->type >= PJSDP_END_OF_ATTR) {
- pj_assert(0);
- return NULL;
- }
-
- desc = &attr_map[rhs->type];
- return (*desc->clone) (pool, rhs);
-}
-
-PJ_DEF(const pjsdp_attr*) pjsdp_attr_find (int count, const pjsdp_attr *attr_array[], int type)
-{
- int i;
-
- for (i=0; i<count; ++i) {
- if (attr_array[i]->type == type)
- return attr_array[i];
- }
- return NULL;
-}
-
-static int print_connection_info( pjsdp_conn_info *c, char *buf, int len)
-{
- char *p = buf;
-
- if (len < 8+c->net_type.slen+c->addr_type.slen+c->addr.slen) {
- return -1;
- }
- *p++ = 'c';
- *p++ = '=';
- pj_memcpy(p, c->net_type.ptr, c->net_type.slen);
- p += c->net_type.slen;
- *p++ = ' ';
- pj_memcpy(p, c->addr_type.ptr, c->addr_type.slen);
- p += c->addr_type.slen;
- *p++ = ' ';
- pj_memcpy(p, c->addr.ptr, c->addr.slen);
- p += c->addr.slen;
- *p++ = '\r';
- *p++ = '\n';
-
- return p-buf;
-}
-
-PJ_DEF(pjsdp_conn_info*) pjsdp_conn_info_clone (pj_pool_t *pool, const pjsdp_conn_info *rhs)
-{
- pjsdp_conn_info *c = pj_pool_alloc (pool, sizeof(pjsdp_conn_info));
- if (!c) return NULL;
-
- if (!pj_strdup (pool, &c->net_type, &rhs->net_type)) return NULL;
- if (!pj_strdup (pool, &c->addr_type, &rhs->addr_type)) return NULL;
- if (!pj_strdup (pool, &c->addr, &rhs->addr)) return NULL;
-
- return c;
-}
-
-static int print_media_desc( pjsdp_media_desc *m, char *buf, int len)
-{
- char *p = buf;
- char *end = buf+len;
- unsigned i;
- int printed;
-
- /* check length for the "m=" line. */
- if (len < m->desc.media.slen+m->desc.transport.slen+12+24) {
- return -1;
- }
- *p++ = 'm'; /* m= */
- *p++ = '=';
- pj_memcpy(p, m->desc.media.ptr, m->desc.media.slen);
- p += m->desc.media.slen;
- *p++ = ' ';
- printed = pj_utoa(m->desc.port, p);
- p += printed;
- if (m->desc.port_count > 1) {
- *p++ = '/';
- printed = pj_utoa(m->desc.port_count, p);
- p += printed;
- }
- *p++ = ' ';
- pj_memcpy(p, m->desc.transport.ptr, m->desc.transport.slen);
- p += m->desc.transport.slen;
- for (i=0; i<m->desc.fmt_count; ++i) {
- *p++ = ' ';
- pj_memcpy(p, m->desc.fmt[i].ptr, m->desc.fmt[i].slen);
- p += m->desc.fmt[i].slen;
- }
- *p++ = '\r';
- *p++ = '\n';
-
- /* print connection info, if present. */
- if (m->conn) {
- printed = print_connection_info(m->conn, p, end-p);
- if (printed < 0) {
- return -1;
- }
- p += printed;
- }
-
- /* print attributes. */
- for (i=0; i<m->attr_count; ++i) {
- printed = print_attr(m->attr[i], p, end-p);
- if (printed < 0) {
- return -1;
- }
- p += printed;
- }
-
- return p-buf;
-}
-
-PJ_DEF(pjsdp_media_desc*) pjsdp_media_desc_clone (pj_pool_t *pool,
- const pjsdp_media_desc *rhs)
-{
- unsigned int i;
- pjsdp_media_desc *m = pj_pool_alloc (pool, sizeof(pjsdp_media_desc));
- if (!m)
- return NULL;
-
- pj_strdup (pool, &m->desc.media, &rhs->desc.media);
- m->desc.port = rhs->desc.port;
- m->desc.port_count = rhs->desc.port_count;
- pj_strdup (pool, &m->desc.transport, &rhs->desc.transport);
- m->desc.fmt_count = rhs->desc.fmt_count;
- for (i=0; i<rhs->desc.fmt_count; ++i)
- m->desc.fmt[i] = rhs->desc.fmt[i];
-
- if (rhs->conn) {
- m->conn = pjsdp_conn_info_clone (pool, rhs->conn);
- if (!m->conn)
- return NULL;
- } else {
- m->conn = NULL;
- }
-
- m->attr_count = rhs->attr_count;
- for (i=0; i < rhs->attr_count; ++i) {
- m->attr[i] = pjsdp_attr_clone (pool, rhs->attr[i]);
- if (!m->attr[i])
- return NULL;
- }
-
- return m;
-}
-
-/** Check if the media description has the specified attribute. */
-PJ_DEF(pj_bool_t) pjsdp_media_desc_has_attr (const pjsdp_media_desc *m,
- pjsdp_attr_type_e attr_type)
-{
- unsigned i;
- for (i=0; i<m->attr_count; ++i) {
- pjsdp_attr *attr = m->attr[i];
- if (attr->type == attr_type)
- return 1;
- }
- return 0;
-}
-
-/** Find rtpmap attribute for the specified payload type. */
-PJ_DEF(const pjsdp_rtpmap_attr*)
-pjsdp_media_desc_find_rtpmap (const pjsdp_media_desc *m, unsigned pt)
-{
- unsigned i;
- for (i=0; i<m->attr_count; ++i) {
- pjsdp_attr *attr = m->attr[i];
- if (attr->type == PJSDP_ATTR_RTPMAP) {
- const pjsdp_rtpmap_attr* rtpmap = (const pjsdp_rtpmap_attr*)attr;
- if (rtpmap->payload_type == pt)
- return rtpmap;
- }
- }
- return NULL;
-}
-
-
-static int print_session(const pjsdp_session_desc *ses, char *buf, pj_ssize_t len)
-{
- char *p = buf;
- char *end = buf+len;
- unsigned i;
- int printed;
-
- /* Check length for v= and o= lines. */
- if (len < 5+
- 2+ses->origin.user.slen+18+
- ses->origin.net_type.slen+ses->origin.addr.slen + 2)
- {
- return -1;
- }
-
- /* SDP version (v= line) */
- pj_memcpy(p, "v=0\r\n", 5);
- p += 5;
-
- /* Owner (o=) line. */
- *p++ = 'o';
- *p++ = '=';
- pj_memcpy(p, ses->origin.user.ptr, ses->origin.user.slen);
- p += ses->origin.user.slen;
- *p++ = ' ';
- printed = pj_utoa(ses->origin.id, p);
- p += printed;
- *p++ = ' ';
- printed = pj_utoa(ses->origin.version, p);
- p += printed;
- *p++ = ' ';
- pj_memcpy(p, ses->origin.net_type.ptr, ses->origin.net_type.slen);
- p += ses->origin.net_type.slen;
- *p++ = ' ';
- pj_memcpy(p, ses->origin.addr_type.ptr, ses->origin.addr_type.slen);
- p += ses->origin.addr_type.slen;
- *p++ = ' ';
- pj_memcpy(p, ses->origin.addr.ptr, ses->origin.addr.slen);
- p += ses->origin.addr.slen;
- *p++ = '\r';
- *p++ = '\n';
-
- /* Session name (s=) line. */
- if ((end-p) < 8+ses->name.slen) {
- return -1;
- }
- *p++ = 's';
- *p++ = '=';
- pj_memcpy(p, ses->name.ptr, ses->name.slen);
- p += ses->name.slen;
- *p++ = '\r';
- *p++ = '\n';
-
- /* Time */
- if ((end-p) < 24) {
- return -1;
- }
- *p++ = 't';
- *p++ = '=';
- printed = pj_utoa(ses->time.start, p);
- p += printed;
- *p++ = ' ';
- printed = pj_utoa(ses->time.stop, p);
- p += printed;
- *p++ = '\r';
- *p++ = '\n';
-
- /* Connection line (c=) if exist. */
- if (ses->conn) {
- printed = print_connection_info(ses->conn, p, end-p);
- if (printed < 1) {
- return -1;
- }
- p += printed;
- }
-
- /* Print all attribute (a=) lines. */
- for (i=0; i<ses->attr_count; ++i) {
- printed = print_attr(ses->attr[i], p, end-p);
- if (printed < 0) {
- return -1;
- }
- p += printed;
- }
-
- /* Print media (m=) lines. */
- for (i=0; i<ses->media_count; ++i) {
- printed = print_media_desc(ses->media[i], p, end-p);
- if (printed < 0) {
- return -1;
- }
- p += printed;
- }
-
- return p-buf;
-}
-
-/******************************************************************************
- * PARSERS
- */
-
-static void parse_version(pj_scanner *scanner)
-{
- pj_scan_advance_n(scanner, 3, SKIP_WS);
- pj_scan_get_newline(scanner);
-}
-
-static void parse_origin(pj_scanner *scanner, pjsdp_session_desc *ses)
-{
- pj_str_t str;
-
- /* o= */
- pj_scan_advance_n(scanner, 2, SKIP_WS);
-
- /* username. */
- pj_scan_get_until_ch(scanner, ' ', &ses->origin.user);
- pj_scan_get_char(scanner);
-
- /* id */
- pj_scan_get_until_ch(scanner, ' ', &str);
- ses->origin.id = pj_strtoul(&str);
- pj_scan_get_char(scanner);
-
- /* version */
- pj_scan_get_until_ch(scanner, ' ', &str);
- ses->origin.version = pj_strtoul(&str);
- pj_scan_get_char(scanner);
-
- /* network-type */
- pj_scan_get_until_ch(scanner, ' ', &ses->origin.net_type);
- pj_scan_get_char(scanner);
-
- /* addr-type */
- pj_scan_get_until_ch(scanner, ' ', &ses->origin.addr_type);
- pj_scan_get_char(scanner);
-
- /* address */
- pj_scan_get_until_ch(scanner, '\r', &ses->origin.addr);
-
- /* newline */
- pj_scan_get_newline(scanner);
-}
-
-static void parse_time(pj_scanner *scanner, pjsdp_session_desc *ses)
-{
- pj_str_t str;
-
- /* t= */
- pj_scan_advance_n(scanner, 2, SKIP_WS);
-
- /* start time */
- pj_scan_get_until_ch(scanner, ' ', &str);
- ses->time.start = pj_strtoul(&str);
-
- pj_scan_get_char(scanner);
-
- /* stop time */
- pj_scan_get_until_ch(scanner, '\r', &str);
- ses->time.stop = pj_strtoul(&str);
-
- /* newline */
- pj_scan_get_newline(scanner);
-}
-
-static void parse_generic_line(pj_scanner *scanner, pj_str_t *str)
-{
- /* x= */
- pj_scan_advance_n(scanner, 2, SKIP_WS);
-
- /* get anything until newline. */
- pj_scan_get_until_ch(scanner, '\r', str);
-
- /* newline. */
- pj_scan_get_newline(scanner);
-}
-
-static void parse_connection_info(pj_scanner *scanner, pjsdp_conn_info *conn)
-{
- /* c= */
- pj_scan_advance_n(scanner, 2, SKIP_WS);
-
- /* network-type */
- pj_scan_get_until_ch(scanner, ' ', &conn->net_type);
- pj_scan_get_char(scanner);
-
- /* addr-type */
- pj_scan_get_until_ch(scanner, ' ', &conn->addr_type);
- pj_scan_get_char(scanner);
-
- /* address. */
- pj_scan_get_until_ch(scanner, '\r', &conn->addr);
-
- /* newline */
- pj_scan_get_newline(scanner);
-}
-
-static void parse_media(pj_scanner *scanner, pjsdp_media_desc *med)
-{
- pj_str_t str;
-
- /* m= */
- pj_scan_advance_n(scanner, 2, SKIP_WS);
-
- /* type */
- pj_scan_get_until_ch(scanner, ' ', &med->desc.media);
- pj_scan_get_char(scanner);
-
- /* port */
- pj_scan_get(scanner, cs_token, &str);
- med->desc.port = (unsigned short)pj_strtoul(&str);
- if (*scanner->current == '/') {
- /* port count */
- pj_scan_get_char(scanner);
- pj_scan_get(scanner, cs_token, &str);
- med->desc.port_count = pj_strtoul(&str);
-
- } else {
- med->desc.port_count = 0;
- }
-
- if (pj_scan_get_char(scanner) != ' ') {
- PJ_THROW(SYNTAX_ERROR);
- }
-
- /* transport */
- pj_scan_get_until_ch(scanner, ' ', &med->desc.transport);
-
- /* format list */
- med->desc.fmt_count = 0;
- while (*scanner->current == ' ') {
- pj_scan_get_char(scanner);
- pj_scan_get(scanner, cs_token, &med->desc.fmt[med->desc.fmt_count++]);
- }
-
- /* newline */
- pj_scan_get_newline(scanner);
-}
-
-static pjsdp_rtpmap_attr * parse_rtpmap_attr( pj_pool_t *pool, pj_scanner *scanner )
-{
- pjsdp_rtpmap_attr *rtpmap;
- pj_str_t str;
-
- rtpmap = pj_pool_calloc(pool, 1, sizeof(*rtpmap));
- if (pj_scan_get_char(scanner) != ':') {
- PJ_THROW(SYNTAX_ERROR);
- }
- pj_scan_get_until_ch(scanner, ' ', &str);
- rtpmap->payload_type = pj_strtoul(&str);
- pj_scan_get_char(scanner);
-
- pj_scan_get_until_ch(scanner, '/', &rtpmap->encoding_name);
- pj_scan_get_char(scanner);
- pj_scan_get(scanner, cs_token, &str);
- rtpmap->clock_rate = pj_strtoul(&str);
-
- if (*scanner->current == '/') {
- pj_scan_get_char(scanner);
- pj_scan_get_until_ch(scanner, '\r', &rtpmap->parameter);
- }
-
- return rtpmap;
-}
-
-static pjsdp_attr_string * parse_generic_string_attr( pj_pool_t *pool, pj_scanner *scanner )
-{
- pjsdp_attr_string *attr;
- attr = pj_pool_calloc(pool, 1, sizeof(*attr));
-
- if (pj_scan_get_char(scanner) != ':') {
- PJ_THROW(SYNTAX_ERROR);
- }
- pj_scan_get_until_ch(scanner, '\r', &attr->value);
- return attr;
-}
-
-static pjsdp_attr_num * parse_generic_num_attr( pj_pool_t *pool, pj_scanner *scanner )
-{
- pjsdp_attr_num *attr;
- pj_str_t str;
-
- attr = pj_pool_calloc(pool, 1, sizeof(*attr));
-
- if (pj_scan_get_char(scanner) != ':') {
- PJ_THROW(SYNTAX_ERROR);
- }
- pj_scan_get_until_ch(scanner, '\r', &str);
- attr->value = pj_strtoul(&str);
- return attr;
-}
-
-static pjsdp_attr * parse_name_only_attr( pj_pool_t *pool, pj_scanner *scanner )
-{
- pjsdp_attr *attr;
-
- PJ_UNUSED_ARG(scanner)
- attr = pj_pool_calloc(pool, 1, sizeof(*attr));
- return attr;
-}
-
-static pjsdp_fmtp_attr * parse_fmtp_attr( pj_pool_t *pool, pj_scanner *scanner )
-{
- pjsdp_fmtp_attr *fmtp;
-
- fmtp = pj_pool_calloc(pool, 1, sizeof(*fmtp));
-
- if (pj_scan_get_char(scanner) != ':') {
- PJ_THROW(SYNTAX_ERROR);
- }
- pj_scan_get_until_ch(scanner, ' ', &fmtp->format);
- pj_scan_get_char(scanner);
- pj_scan_get_until_ch(scanner, '\r', &fmtp->param);
- return fmtp;
-}
-
-static pjsdp_attr *parse_attr( pj_pool_t *pool, pj_scanner *scanner)
-{
- void * (*parse_func)(pj_pool_t *pool, pj_scanner *scanner) = NULL;
- pj_str_t attrname;
- unsigned i;
- pjsdp_attr *attr;
-
- /* skip a= */
- pj_scan_advance_n(scanner, 2, SKIP_WS);
-
- /* get attr name. */
- pj_scan_get(scanner, cs_token, &attrname);
-
- /* find entry to handle attrname */
- for (i=0; i<PJ_ARRAY_SIZE(attr_map); ++i) {
- struct attr_map_rec *p = &attr_map[i];
- if (pj_strcmp(&attrname, &p->name) == 0) {
- parse_func = p->parse_attr;
- break;
- }
- }
-
- /* fallback to generic string parser. */
- if (parse_func == NULL) {
- parse_func = &parse_generic_string_attr;
- }
-
- attr = (*parse_func)(pool, scanner);
- attr->type = i;
-
- /* newline */
- pj_scan_get_newline(scanner);
-
- return attr;
-}
-
-static void on_scanner_error(pj_scanner *scanner)
-{
- PJ_UNUSED_ARG(scanner)
-
- PJ_THROW(SYNTAX_ERROR);
-}
-
-/*
- * Parse SDP message.
- */
-PJ_DEF(pjsdp_session_desc*) pjsdp_parse( char *buf, pj_size_t len,
- pj_pool_t *pool)
-{
- pj_scanner scanner;
- pjsdp_session_desc *session;
- pjsdp_media_desc *media = NULL;
- void *attr;
- pjsdp_conn_info *conn;
- pj_str_t dummy;
- int cur_name = 254;
- PJ_USE_EXCEPTION;
-
- init_sdp_parser();
-
- pj_scan_init(&scanner, buf, len, 0, &on_scanner_error);
- session = pj_pool_calloc(pool, 1, sizeof(*session));
-
- PJ_TRY {
- while (!pj_scan_is_eof(&scanner)) {
- cur_name = *scanner.current;
- switch (cur_name) {
- case 'a':
- attr = parse_attr(pool, &scanner);
- if (attr) {
- if (media) {
- media->attr[media->attr_count++] = attr;
- } else {
- session->attr[session->attr_count++] = attr;
- }
- }
- break;
- case 'o':
- parse_origin(&scanner, session);
- break;
- case 's':
- parse_generic_line(&scanner, &session->name);
- break;
- case 'c':
- conn = pj_pool_calloc(pool, 1, sizeof(*conn));
- parse_connection_info(&scanner, conn);
- if (media) {
- media->conn = conn;
- } else {
- session->conn = conn;
- }
- break;
- case 't':
- parse_time(&scanner, session);
- break;
- case 'm':
- media = pj_pool_calloc(pool, 1, sizeof(*media));
- parse_media(&scanner, media);
- session->media[ session->media_count++ ] = media;
- break;
- case 'v':
- parse_version(&scanner);
- break;
- default:
- parse_generic_line(&scanner, &dummy);
- break;
- }
- }
- }
- PJ_CATCH(SYNTAX_ERROR) {
- PJ_LOG(2, (LOG_THIS, "Syntax error in SDP parser '%c' line %d col %d",
- cur_name, scanner.line, scanner.col));
- if (!pj_scan_is_eof(&scanner)) {
- if (*scanner.current != '\r') {
- pj_scan_get_until_ch(&scanner, '\r', &dummy);
- }
- pj_scan_get_newline(&scanner);
- }
- }
- PJ_END;
-
- pj_scan_fini(&scanner);
- return session;
-}
-
-/*
- * Print SDP description.
- */
-PJ_DEF(int) pjsdp_print( const pjsdp_session_desc *desc, char *buf, pj_size_t size)
-{
- return print_session(desc, buf, size);
-}
-
-
+/* $Id$ */ +/* + * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <pjmedia/sdp.h> +#include <pj/scanner.h> +#include <pj/except.h> +#include <pj/log.h> +#include <pj/os.h> +#include <pj/string.h> +#include <pj/pool.h> + +enum { + SKIP_WS = 0, + SYNTAX_ERROR = 1, +}; +#define TOKEN "-.!%*_=`'~" +#define NTP_OFFSET ((pj_uint32_t)2208988800) +#define LOG_THIS "sdp" + +/* + * Prototypes for line parser. + */ +static void parse_version(pj_scanner *scanner); +static void parse_origin(pj_scanner *scanner, pjsdp_session_desc *ses); +static void parse_time(pj_scanner *scanner, pjsdp_session_desc *ses); +static void parse_generic_line(pj_scanner *scanner, pj_str_t *str); +static void parse_connection_info(pj_scanner *scanner, pjsdp_conn_info *conn); +static pjsdp_attr *parse_attr(pj_pool_t *pool, pj_scanner *scanner); +static void parse_media(pj_scanner *scanner, pjsdp_media_desc *med); + +/* + * Prototypes for attribute parsers. + */ +static pjsdp_rtpmap_attr * parse_rtpmap_attr( pj_pool_t *pool, pj_scanner *scanner ); +static pjsdp_attr_string * parse_generic_string_attr( pj_pool_t *pool, pj_scanner *scanner ); +static pjsdp_attr_num * parse_generic_num_attr( pj_pool_t *pool, pj_scanner *scanner ); +static pjsdp_attr * parse_name_only_attr( pj_pool_t *pool, pj_scanner *scanner ); +static pjsdp_fmtp_attr * parse_fmtp_attr( pj_pool_t *pool, pj_scanner *scanner ); + + +/* + * Prototypes for functions to print attribute. + * All of them returns integer for the length printed, or -1 on error. + */ +static int print_rtpmap_attr(const pjsdp_rtpmap_attr *attr, + char *buf, int length); +static int print_generic_string_attr(const pjsdp_attr_string *attr, + char *buf, int length); +static int print_generic_num_attr(const pjsdp_attr_num *attr, + char *buf, int length); +static int print_name_only_attr(const pjsdp_attr *attr, + char *buf, int length); +static int print_fmtp_attr(const pjsdp_fmtp_attr *attr, + char *buf, int length); + +/* + * Prototypes for cloning attributes. + */ +static pjsdp_attr* clone_rtpmap_attr (pj_pool_t *pool, const pjsdp_attr *rhs); +static pjsdp_attr* clone_generic_string_attr (pj_pool_t *pool, const pjsdp_attr *rhs); +static pjsdp_attr* clone_generic_num_attr (pj_pool_t *pool, const pjsdp_attr *rhs); +static pjsdp_attr* clone_name_only_attr (pj_pool_t *pool, const pjsdp_attr *rhs); +static pjsdp_attr* clone_fmtp_attr (pj_pool_t *pool, const pjsdp_attr *rhs); + + +/* + * Prototypes + */ +static void init_sdp_parser(void); + + +typedef void * (*FPARSE)(pj_pool_t *pool, pj_scanner *scanner); +typedef int (*FPRINT)(const void *attr, char *buf, int length); +typedef pjsdp_attr* (*FCLONE)(pj_pool_t *pool, const pjsdp_attr *rhs); + +/* + * Array of functions to print attribute. + */ +static struct attr_map_rec +{ + pj_str_t name; + FPARSE parse_attr; + FPRINT print_attr; + FCLONE clone; +} attr_map[] = +{ + {{"rtpmap", 6}, (FPARSE)&parse_rtpmap_attr, (FPRINT)&print_rtpmap_attr, (FCLONE)&clone_rtpmap_attr}, + {{"cat", 3}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"keywds", 6}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"tool", 4}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"ptime", 5}, (FPARSE)&parse_generic_num_attr, (FPRINT)&print_generic_num_attr, (FCLONE)&clone_generic_num_attr}, + {{"recvonly", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr}, + {{"sendonly", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr}, + {{"sendrecv", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr}, + {{"orient", 6}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"type", 4}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"charset", 7}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"sdplang", 7}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"lang", 4}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"framerate", 9}, (FPARSE)&parse_generic_string_attr, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr}, + {{"quality", 7}, (FPARSE)&parse_generic_num_attr, (FPRINT)&print_generic_num_attr, (FCLONE)&clone_generic_num_attr}, + {{"fmtp", 4}, (FPARSE)&parse_fmtp_attr, (FPRINT)&print_fmtp_attr, (FCLONE)&clone_fmtp_attr}, + {{"inactive", 8}, (FPARSE)&parse_name_only_attr, (FPRINT)&print_name_only_attr, (FCLONE)&clone_name_only_attr}, + {{"", 0}, NULL, (FPRINT)&print_generic_string_attr, (FCLONE)&clone_generic_string_attr} +}; + +/* + * Scanner character specification. + */ +static int is_initialized; +static pj_char_spec cs_token; + +static void init_sdp_parser(void) +{ + if (is_initialized == 0) { + is_initialized = 1; + if (is_initialized != 1) { + return; + } + } + pj_cs_add_alpha(cs_token); + pj_cs_add_num(cs_token); + pj_cs_add_str( cs_token, TOKEN); +} + +static int print_rtpmap_attr(const pjsdp_rtpmap_attr *rtpmap, + char *buf, int len) +{ + char *p = buf; + + if (len < 16+rtpmap->encoding_name.slen+rtpmap->parameter.slen) { + return -1; + } + + /* colon and payload type. */ + *p++ = ':'; + len = pj_utoa(rtpmap->payload_type, p); + p += len; + + /* space, encoding name */ + *p++ = ' '; + pj_memcpy(p, rtpmap->encoding_name.ptr, rtpmap->encoding_name.slen); + p += rtpmap->encoding_name.slen; + + /* slash, clock-rate. */ + *p++ = '/'; + len = pj_utoa(rtpmap->clock_rate, p); + p += len; + + /* optionally add encoding parameter. */ + if (rtpmap->parameter.slen) { + *p++ = '/'; + pj_memcpy(p, rtpmap->parameter.ptr, rtpmap->parameter.slen); + p += rtpmap->parameter.slen; + } + + return p-buf; +} + +static int print_generic_string_attr(const pjsdp_attr_string *attr, + char *buf, int len) +{ + char *p = buf; + + if (len < attr->value.slen + 4) { + return -1; + } + + /* colon and attribute value. */ + *p++ = ':'; + pj_memcpy(p, attr->value.ptr, attr->value.slen); + p += attr->value.slen; + + return p-buf; +} + +static int print_generic_num_attr(const pjsdp_attr_num *attr, char *buf, int len) +{ + char *p = buf; + + if (len < 10) { + return -1; + } + *p++ = ':'; + return pj_utoa(attr->value, p); +} + +static int print_name_only_attr(const pjsdp_attr *attr, char *buf, int len) +{ + PJ_UNUSED_ARG(attr) + PJ_UNUSED_ARG(buf) + PJ_UNUSED_ARG(len) + return 0; +} + +static int print_fmtp_attr(const pjsdp_fmtp_attr *fmtp, char *buf, int len) +{ + char *p = buf; + + if (len < 4+fmtp->format.slen+fmtp->param.slen) { + return -1; + } + + /* colon and format. */ + *p++ = ':'; + pj_memcpy(p, fmtp->format.ptr, fmtp->format.slen); + p += fmtp->format.slen; + + /* space and parameter. */ + *p++ = ' '; + pj_memcpy(p, fmtp->param.ptr, fmtp->param.slen); + p += fmtp->param.slen; + + return p-buf; +} + + +static int print_attr(const pjsdp_attr *attr, char *buf, int len) +{ + char *p = buf; + struct attr_map_rec *desc = &attr_map[attr->type]; + + if (len < 16) { + return -1; + } + + *p++ = 'a'; + *p++ = '='; + pj_memcpy(p, desc->name.ptr, desc->name.slen); + p += desc->name.slen; + + len = (*desc->print_attr)(attr, p, (buf+len)-p); + if (len < 0) { + return -1; + } + p += len; + *p++ = '\r'; + *p++ = '\n'; + return p-buf; +} + +static pjsdp_attr* clone_rtpmap_attr (pj_pool_t *pool, const pjsdp_attr *p) +{ + const pjsdp_rtpmap_attr *rhs = (const pjsdp_rtpmap_attr*)p; + pjsdp_rtpmap_attr *attr = pj_pool_alloc (pool, sizeof(pjsdp_rtpmap_attr)); + if (!attr) + return NULL; + + attr->type = rhs->type; + attr->payload_type = rhs->payload_type; + if (!pj_strdup (pool, &attr->encoding_name, &rhs->encoding_name)) return NULL; + attr->clock_rate = rhs->clock_rate; + if (!pj_strdup (pool, &attr->parameter, &rhs->parameter)) return NULL; + + return (pjsdp_attr*)attr; +} + +static pjsdp_attr* clone_generic_string_attr (pj_pool_t *pool, const pjsdp_attr *p) +{ + const pjsdp_attr_string* rhs = (const pjsdp_attr_string*) p; + pjsdp_attr_string *attr = pj_pool_alloc (pool, sizeof(pjsdp_attr_string)); + if (!attr) + return NULL; + + attr->type = rhs->type; + if (!pj_strdup (pool, &attr->value, &rhs->value)) return NULL; + + return (pjsdp_attr*)attr; +} + +static pjsdp_attr* clone_generic_num_attr (pj_pool_t *pool, const pjsdp_attr *p) +{ + const pjsdp_attr_num* rhs = (const pjsdp_attr_num*) p; + pjsdp_attr_num *attr = pj_pool_alloc (pool, sizeof(pjsdp_attr_num)); + if (!attr) + return NULL; + + attr->type = rhs->type; + attr->value = rhs->value; + + return (pjsdp_attr*)attr; +} + +static pjsdp_attr* clone_name_only_attr (pj_pool_t *pool, const pjsdp_attr *rhs) +{ + pjsdp_attr *attr = pj_pool_alloc (pool, sizeof(pjsdp_attr)); + if (!attr) + return NULL; + + attr->type = rhs->type; + return attr; +} + +static pjsdp_attr* clone_fmtp_attr (pj_pool_t *pool, const pjsdp_attr *p) +{ + const pjsdp_fmtp_attr* rhs = (const pjsdp_fmtp_attr*) p; + pjsdp_fmtp_attr *attr = pj_pool_alloc (pool, sizeof(pjsdp_fmtp_attr)); + if (!attr) + return NULL; + + attr->type = rhs->type; + if (!pj_strdup (pool, &attr->format, &rhs->format)) return NULL; + if (!pj_strdup (pool, &attr->param, &rhs->param)) return NULL; + + return (pjsdp_attr*)attr; +} + +PJ_DEF(pjsdp_attr*) pjsdp_attr_clone (pj_pool_t *pool, const pjsdp_attr *rhs) +{ + struct attr_map_rec *desc; + + if (rhs->type >= PJSDP_END_OF_ATTR) { + pj_assert(0); + return NULL; + } + + desc = &attr_map[rhs->type]; + return (*desc->clone) (pool, rhs); +} + +PJ_DEF(const pjsdp_attr*) pjsdp_attr_find (int count, const pjsdp_attr *attr_array[], int type) +{ + int i; + + for (i=0; i<count; ++i) { + if (attr_array[i]->type == type) + return attr_array[i]; + } + return NULL; +} + +static int print_connection_info( pjsdp_conn_info *c, char *buf, int len) +{ + char *p = buf; + + if (len < 8+c->net_type.slen+c->addr_type.slen+c->addr.slen) { + return -1; + } + *p++ = 'c'; + *p++ = '='; + pj_memcpy(p, c->net_type.ptr, c->net_type.slen); + p += c->net_type.slen; + *p++ = ' '; + pj_memcpy(p, c->addr_type.ptr, c->addr_type.slen); + p += c->addr_type.slen; + *p++ = ' '; + pj_memcpy(p, c->addr.ptr, c->addr.slen); + p += c->addr.slen; + *p++ = '\r'; + *p++ = '\n'; + + return p-buf; +} + +PJ_DEF(pjsdp_conn_info*) pjsdp_conn_info_clone (pj_pool_t *pool, const pjsdp_conn_info *rhs) +{ + pjsdp_conn_info *c = pj_pool_alloc (pool, sizeof(pjsdp_conn_info)); + if (!c) return NULL; + + if (!pj_strdup (pool, &c->net_type, &rhs->net_type)) return NULL; + if (!pj_strdup (pool, &c->addr_type, &rhs->addr_type)) return NULL; + if (!pj_strdup (pool, &c->addr, &rhs->addr)) return NULL; + + return c; +} + +static int print_media_desc( pjsdp_media_desc *m, char *buf, int len) +{ + char *p = buf; + char *end = buf+len; + unsigned i; + int printed; + + /* check length for the "m=" line. */ + if (len < m->desc.media.slen+m->desc.transport.slen+12+24) { + return -1; + } + *p++ = 'm'; /* m= */ + *p++ = '='; + pj_memcpy(p, m->desc.media.ptr, m->desc.media.slen); + p += m->desc.media.slen; + *p++ = ' '; + printed = pj_utoa(m->desc.port, p); + p += printed; + if (m->desc.port_count > 1) { + *p++ = '/'; + printed = pj_utoa(m->desc.port_count, p); + p += printed; + } + *p++ = ' '; + pj_memcpy(p, m->desc.transport.ptr, m->desc.transport.slen); + p += m->desc.transport.slen; + for (i=0; i<m->desc.fmt_count; ++i) { + *p++ = ' '; + pj_memcpy(p, m->desc.fmt[i].ptr, m->desc.fmt[i].slen); + p += m->desc.fmt[i].slen; + } + *p++ = '\r'; + *p++ = '\n'; + + /* print connection info, if present. */ + if (m->conn) { + printed = print_connection_info(m->conn, p, end-p); + if (printed < 0) { + return -1; + } + p += printed; + } + + /* print attributes. */ + for (i=0; i<m->attr_count; ++i) { + printed = print_attr(m->attr[i], p, end-p); + if (printed < 0) { + return -1; + } + p += printed; + } + + return p-buf; +} + +PJ_DEF(pjsdp_media_desc*) pjsdp_media_desc_clone (pj_pool_t *pool, + const pjsdp_media_desc *rhs) +{ + unsigned int i; + pjsdp_media_desc *m = pj_pool_alloc (pool, sizeof(pjsdp_media_desc)); + if (!m) + return NULL; + + pj_strdup (pool, &m->desc.media, &rhs->desc.media); + m->desc.port = rhs->desc.port; + m->desc.port_count = rhs->desc.port_count; + pj_strdup (pool, &m->desc.transport, &rhs->desc.transport); + m->desc.fmt_count = rhs->desc.fmt_count; + for (i=0; i<rhs->desc.fmt_count; ++i) + m->desc.fmt[i] = rhs->desc.fmt[i]; + + if (rhs->conn) { + m->conn = pjsdp_conn_info_clone (pool, rhs->conn); + if (!m->conn) + return NULL; + } else { + m->conn = NULL; + } + + m->attr_count = rhs->attr_count; + for (i=0; i < rhs->attr_count; ++i) { + m->attr[i] = pjsdp_attr_clone (pool, rhs->attr[i]); + if (!m->attr[i]) + return NULL; + } + + return m; +} + +/** Check if the media description has the specified attribute. */ +PJ_DEF(pj_bool_t) pjsdp_media_desc_has_attr (const pjsdp_media_desc *m, + pjsdp_attr_type_e attr_type) +{ + unsigned i; + for (i=0; i<m->attr_count; ++i) { + pjsdp_attr *attr = m->attr[i]; + if (attr->type == attr_type) + return 1; + } + return 0; +} + +/** Find rtpmap attribute for the specified payload type. */ +PJ_DEF(const pjsdp_rtpmap_attr*) +pjsdp_media_desc_find_rtpmap (const pjsdp_media_desc *m, unsigned pt) +{ + unsigned i; + for (i=0; i<m->attr_count; ++i) { + pjsdp_attr *attr = m->attr[i]; + if (attr->type == PJSDP_ATTR_RTPMAP) { + const pjsdp_rtpmap_attr* rtpmap = (const pjsdp_rtpmap_attr*)attr; + if (rtpmap->payload_type == pt) + return rtpmap; + } + } + return NULL; +} + + +static int print_session(const pjsdp_session_desc *ses, char *buf, pj_ssize_t len) +{ + char *p = buf; + char *end = buf+len; + unsigned i; + int printed; + + /* Check length for v= and o= lines. */ + if (len < 5+ + 2+ses->origin.user.slen+18+ + ses->origin.net_type.slen+ses->origin.addr.slen + 2) + { + return -1; + } + + /* SDP version (v= line) */ + pj_memcpy(p, "v=0\r\n", 5); + p += 5; + + /* Owner (o=) line. */ + *p++ = 'o'; + *p++ = '='; + pj_memcpy(p, ses->origin.user.ptr, ses->origin.user.slen); + p += ses->origin.user.slen; + *p++ = ' '; + printed = pj_utoa(ses->origin.id, p); + p += printed; + *p++ = ' '; + printed = pj_utoa(ses->origin.version, p); + p += printed; + *p++ = ' '; + pj_memcpy(p, ses->origin.net_type.ptr, ses->origin.net_type.slen); + p += ses->origin.net_type.slen; + *p++ = ' '; + pj_memcpy(p, ses->origin.addr_type.ptr, ses->origin.addr_type.slen); + p += ses->origin.addr_type.slen; + *p++ = ' '; + pj_memcpy(p, ses->origin.addr.ptr, ses->origin.addr.slen); + p += ses->origin.addr.slen; + *p++ = '\r'; + *p++ = '\n'; + + /* Session name (s=) line. */ + if ((end-p) < 8+ses->name.slen) { + return -1; + } + *p++ = 's'; + *p++ = '='; + pj_memcpy(p, ses->name.ptr, ses->name.slen); + p += ses->name.slen; + *p++ = '\r'; + *p++ = '\n'; + + /* Time */ + if ((end-p) < 24) { + return -1; + } + *p++ = 't'; + *p++ = '='; + printed = pj_utoa(ses->time.start, p); + p += printed; + *p++ = ' '; + printed = pj_utoa(ses->time.stop, p); + p += printed; + *p++ = '\r'; + *p++ = '\n'; + + /* Connection line (c=) if exist. */ + if (ses->conn) { + printed = print_connection_info(ses->conn, p, end-p); + if (printed < 1) { + return -1; + } + p += printed; + } + + /* Print all attribute (a=) lines. */ + for (i=0; i<ses->attr_count; ++i) { + printed = print_attr(ses->attr[i], p, end-p); + if (printed < 0) { + return -1; + } + p += printed; + } + + /* Print media (m=) lines. */ + for (i=0; i<ses->media_count; ++i) { + printed = print_media_desc(ses->media[i], p, end-p); + if (printed < 0) { + return -1; + } + p += printed; + } + + return p-buf; +} + +/****************************************************************************** + * PARSERS + */ + +static void parse_version(pj_scanner *scanner) +{ + pj_scan_advance_n(scanner, 3, SKIP_WS); + pj_scan_get_newline(scanner); +} + +static void parse_origin(pj_scanner *scanner, pjsdp_session_desc *ses) +{ + pj_str_t str; + + /* o= */ + pj_scan_advance_n(scanner, 2, SKIP_WS); + + /* username. */ + pj_scan_get_until_ch(scanner, ' ', &ses->origin.user); + pj_scan_get_char(scanner); + + /* id */ + pj_scan_get_until_ch(scanner, ' ', &str); + ses->origin.id = pj_strtoul(&str); + pj_scan_get_char(scanner); + + /* version */ + pj_scan_get_until_ch(scanner, ' ', &str); + ses->origin.version = pj_strtoul(&str); + pj_scan_get_char(scanner); + + /* network-type */ + pj_scan_get_until_ch(scanner, ' ', &ses->origin.net_type); + pj_scan_get_char(scanner); + + /* addr-type */ + pj_scan_get_until_ch(scanner, ' ', &ses->origin.addr_type); + pj_scan_get_char(scanner); + + /* address */ + pj_scan_get_until_ch(scanner, '\r', &ses->origin.addr); + + /* newline */ + pj_scan_get_newline(scanner); +} + +static void parse_time(pj_scanner *scanner, pjsdp_session_desc *ses) +{ + pj_str_t str; + + /* t= */ + pj_scan_advance_n(scanner, 2, SKIP_WS); + + /* start time */ + pj_scan_get_until_ch(scanner, ' ', &str); + ses->time.start = pj_strtoul(&str); + + pj_scan_get_char(scanner); + + /* stop time */ + pj_scan_get_until_ch(scanner, '\r', &str); + ses->time.stop = pj_strtoul(&str); + + /* newline */ + pj_scan_get_newline(scanner); +} + +static void parse_generic_line(pj_scanner *scanner, pj_str_t *str) +{ + /* x= */ + pj_scan_advance_n(scanner, 2, SKIP_WS); + + /* get anything until newline. */ + pj_scan_get_until_ch(scanner, '\r', str); + + /* newline. */ + pj_scan_get_newline(scanner); +} + +static void parse_connection_info(pj_scanner *scanner, pjsdp_conn_info *conn) +{ + /* c= */ + pj_scan_advance_n(scanner, 2, SKIP_WS); + + /* network-type */ + pj_scan_get_until_ch(scanner, ' ', &conn->net_type); + pj_scan_get_char(scanner); + + /* addr-type */ + pj_scan_get_until_ch(scanner, ' ', &conn->addr_type); + pj_scan_get_char(scanner); + + /* address. */ + pj_scan_get_until_ch(scanner, '\r', &conn->addr); + + /* newline */ + pj_scan_get_newline(scanner); +} + +static void parse_media(pj_scanner *scanner, pjsdp_media_desc *med) +{ + pj_str_t str; + + /* m= */ + pj_scan_advance_n(scanner, 2, SKIP_WS); + + /* type */ + pj_scan_get_until_ch(scanner, ' ', &med->desc.media); + pj_scan_get_char(scanner); + + /* port */ + pj_scan_get(scanner, cs_token, &str); + med->desc.port = (unsigned short)pj_strtoul(&str); + if (*scanner->current == '/') { + /* port count */ + pj_scan_get_char(scanner); + pj_scan_get(scanner, cs_token, &str); + med->desc.port_count = pj_strtoul(&str); + + } else { + med->desc.port_count = 0; + } + + if (pj_scan_get_char(scanner) != ' ') { + PJ_THROW(SYNTAX_ERROR); + } + + /* transport */ + pj_scan_get_until_ch(scanner, ' ', &med->desc.transport); + + /* format list */ + med->desc.fmt_count = 0; + while (*scanner->current == ' ') { + pj_scan_get_char(scanner); + pj_scan_get(scanner, cs_token, &med->desc.fmt[med->desc.fmt_count++]); + } + + /* newline */ + pj_scan_get_newline(scanner); +} + +static pjsdp_rtpmap_attr * parse_rtpmap_attr( pj_pool_t *pool, pj_scanner *scanner ) +{ + pjsdp_rtpmap_attr *rtpmap; + pj_str_t str; + + rtpmap = pj_pool_calloc(pool, 1, sizeof(*rtpmap)); + if (pj_scan_get_char(scanner) != ':') { + PJ_THROW(SYNTAX_ERROR); + } + pj_scan_get_until_ch(scanner, ' ', &str); + rtpmap->payload_type = pj_strtoul(&str); + pj_scan_get_char(scanner); + + pj_scan_get_until_ch(scanner, '/', &rtpmap->encoding_name); + pj_scan_get_char(scanner); + pj_scan_get(scanner, cs_token, &str); + rtpmap->clock_rate = pj_strtoul(&str); + + if (*scanner->current == '/') { + pj_scan_get_char(scanner); + pj_scan_get_until_ch(scanner, '\r', &rtpmap->parameter); + } + + return rtpmap; +} + +static pjsdp_attr_string * parse_generic_string_attr( pj_pool_t *pool, pj_scanner *scanner ) +{ + pjsdp_attr_string *attr; + attr = pj_pool_calloc(pool, 1, sizeof(*attr)); + + if (pj_scan_get_char(scanner) != ':') { + PJ_THROW(SYNTAX_ERROR); + } + pj_scan_get_until_ch(scanner, '\r', &attr->value); + return attr; +} + +static pjsdp_attr_num * parse_generic_num_attr( pj_pool_t *pool, pj_scanner *scanner ) +{ + pjsdp_attr_num *attr; + pj_str_t str; + + attr = pj_pool_calloc(pool, 1, sizeof(*attr)); + + if (pj_scan_get_char(scanner) != ':') { + PJ_THROW(SYNTAX_ERROR); + } + pj_scan_get_until_ch(scanner, '\r', &str); + attr->value = pj_strtoul(&str); + return attr; +} + +static pjsdp_attr * parse_name_only_attr( pj_pool_t *pool, pj_scanner *scanner ) +{ + pjsdp_attr *attr; + + PJ_UNUSED_ARG(scanner) + attr = pj_pool_calloc(pool, 1, sizeof(*attr)); + return attr; +} + +static pjsdp_fmtp_attr * parse_fmtp_attr( pj_pool_t *pool, pj_scanner *scanner ) +{ + pjsdp_fmtp_attr *fmtp; + + fmtp = pj_pool_calloc(pool, 1, sizeof(*fmtp)); + + if (pj_scan_get_char(scanner) != ':') { + PJ_THROW(SYNTAX_ERROR); + } + pj_scan_get_until_ch(scanner, ' ', &fmtp->format); + pj_scan_get_char(scanner); + pj_scan_get_until_ch(scanner, '\r', &fmtp->param); + return fmtp; +} + +static pjsdp_attr *parse_attr( pj_pool_t *pool, pj_scanner *scanner) +{ + void * (*parse_func)(pj_pool_t *pool, pj_scanner *scanner) = NULL; + pj_str_t attrname; + unsigned i; + pjsdp_attr *attr; + + /* skip a= */ + pj_scan_advance_n(scanner, 2, SKIP_WS); + + /* get attr name. */ + pj_scan_get(scanner, cs_token, &attrname); + + /* find entry to handle attrname */ + for (i=0; i<PJ_ARRAY_SIZE(attr_map); ++i) { + struct attr_map_rec *p = &attr_map[i]; + if (pj_strcmp(&attrname, &p->name) == 0) { + parse_func = p->parse_attr; + break; + } + } + + /* fallback to generic string parser. */ + if (parse_func == NULL) { + parse_func = &parse_generic_string_attr; + } + + attr = (*parse_func)(pool, scanner); + attr->type = i; + + /* newline */ + pj_scan_get_newline(scanner); + + return attr; +} + +static void on_scanner_error(pj_scanner *scanner) +{ + PJ_UNUSED_ARG(scanner) + + PJ_THROW(SYNTAX_ERROR); +} + +/* + * Parse SDP message. + */ +PJ_DEF(pjsdp_session_desc*) pjsdp_parse( char *buf, pj_size_t len, + pj_pool_t *pool) +{ + pj_scanner scanner; + pjsdp_session_desc *session; + pjsdp_media_desc *media = NULL; + void *attr; + pjsdp_conn_info *conn; + pj_str_t dummy; + int cur_name = 254; + PJ_USE_EXCEPTION; + + init_sdp_parser(); + + pj_scan_init(&scanner, buf, len, 0, &on_scanner_error); + session = pj_pool_calloc(pool, 1, sizeof(*session)); + + PJ_TRY { + while (!pj_scan_is_eof(&scanner)) { + cur_name = *scanner.current; + switch (cur_name) { + case 'a': + attr = parse_attr(pool, &scanner); + if (attr) { + if (media) { + media->attr[media->attr_count++] = attr; + } else { + session->attr[session->attr_count++] = attr; + } + } + break; + case 'o': + parse_origin(&scanner, session); + break; + case 's': + parse_generic_line(&scanner, &session->name); + break; + case 'c': + conn = pj_pool_calloc(pool, 1, sizeof(*conn)); + parse_connection_info(&scanner, conn); + if (media) { + media->conn = conn; + } else { + session->conn = conn; + } + break; + case 't': + parse_time(&scanner, session); + break; + case 'm': + media = pj_pool_calloc(pool, 1, sizeof(*media)); + parse_media(&scanner, media); + session->media[ session->media_count++ ] = media; + break; + case 'v': + parse_version(&scanner); + break; + default: + parse_generic_line(&scanner, &dummy); + break; + } + } + } + PJ_CATCH(SYNTAX_ERROR) { + PJ_LOG(2, (LOG_THIS, "Syntax error in SDP parser '%c' line %d col %d", + cur_name, scanner.line, scanner.col)); + if (!pj_scan_is_eof(&scanner)) { + if (*scanner.current != '\r') { + pj_scan_get_until_ch(&scanner, '\r', &dummy); + } + pj_scan_get_newline(&scanner); + } + } + PJ_END; + + pj_scan_fini(&scanner); + return session; +} + +/* + * Print SDP description. + */ +PJ_DEF(int) pjsdp_print( const pjsdp_session_desc *desc, char *buf, pj_size_t size) +{ + return print_session(desc, buf, size); +} + + |