diff options
Diffstat (limited to 'pjmedia/src/pjmedia/sdp.c')
| -rw-r--r-- | pjmedia/src/pjmedia/sdp.c | 934 |
1 files changed, 934 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia/sdp.c b/pjmedia/src/pjmedia/sdp.c new file mode 100644 index 00000000..43b47d1d --- /dev/null +++ b/pjmedia/src/pjmedia/sdp.c @@ -0,0 +1,934 @@ +/* $Header: /pjproject/pjmedia/src/pjmedia/sdp.c 9 6/12/05 11:36a Bennylp $ */
+
+
+#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);
+}
+
+
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