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rtp: helpers to parse a=fmtp lines
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@ -28,6 +28,8 @@ librtp_plugin_la_LIBADD += libvlc_srtp.la $(GCRYPT_LIBS)
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librtp_plugin_la_DEPENDENCIES += libvlc_srtp.la
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endif
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noinst_HEADERS += access/rtp/fmtp.h
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# RTP payload parser plugins
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rtpparsedir = $(accessdir)/rtp
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rtpparse_LTLIBRARIES = \
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106
modules/access/rtp/fmtp.h
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106
modules/access/rtp/fmtp.h
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@ -0,0 +1,106 @@
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/**
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* @file fmtp.h
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* @brief SDP format parameters (fmtp) helpers
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*/
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/*****************************************************************************
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* Copyright © 2022 Rémi Denis-Courmont
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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****************************************************************************/
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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static inline
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const char *vlc_sdp_fmtp_get_str(const struct vlc_sdp_pt *desc,
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const char *name, size_t *restrict lenp)
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{
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const char *p = desc->parameters;
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size_t namelen = strlen(name);
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while (p != NULL) {
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p += strspn(p, " ");
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if (strncmp(p, name, namelen) == 0 && p[namelen] == '=') {
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p += namelen + 1;
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*lenp = strcspn(p, ";");
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return p;
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}
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p = strchr(p, ';');
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if (p != NULL)
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p++;
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}
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return NULL;
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}
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static
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int vlc_sdp_fmtp_get_ull(const struct vlc_sdp_pt *desc, const char *name,
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unsigned long long *restrict res)
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{
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size_t len;
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const char *n = vlc_sdp_fmtp_get_str(desc, name, &len);
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if (n == NULL)
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return -ENOENT;
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if (len == 0)
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return -EINVAL;
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char *end;
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unsigned long long ull = strtoull(n, &end, 10);
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if (end != n + len)
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return -EINVAL;
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*res = ull;
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return 0;
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}
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static inline
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int vlc_sdp_fmtp_get_u16(const struct vlc_sdp_pt *desc, const char *name,
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uint16_t *restrict res)
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{
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unsigned long long ull;
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int err = vlc_sdp_fmtp_get_ull(desc, name, &ull);
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if (err == 0) {
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if (ull >> 16)
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return -ERANGE;
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*res = ull;
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}
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return err;
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}
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static inline
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int vlc_sdp_fmtp_get_u8(const struct vlc_sdp_pt *desc, const char *name,
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uint8_t *restrict res)
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{
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unsigned long long ull;
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int err = vlc_sdp_fmtp_get_ull(desc, name, &ull);
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if (err == 0) {
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if (ull >> 8)
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return -ERANGE;
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*res = ull;
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}
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return err;
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}
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#define vlc_sdp_fmtp_get(desc, name, vp) \
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_Generic (*(vp), \
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uint16_t: vlc_sdp_fmtp_get_u16(desc, name, (uint16_t *)(vp)), \
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uint8_t: vlc_sdp_fmtp_get_u8(desc, name, (uint8_t *)(vp)))
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