From b40fecd9ab0ec146f77aeb9419892ae4cbfd1c1a Mon Sep 17 00:00:00 2001 From: Joshua Colp Date: Mon, 24 Sep 2012 14:25:43 +0000 Subject: [PATCH] Fix an issue with H.264 format attribute comparison and fix an issue with improper SDP being produced. The H.264 format attribute module compares two format attribute structures to determine if they are compatible or not. In some instances it was possible for this check to determine that both structures were incompatible when they actually should be considered compatible. This check has now been made even more permissive by assuming that if no attribute information is available the two structures are compatible. If both structures contain attribute information a base level comparison of the H.264 IDC value is done to see if they are compatible or not. The above issue uncovered a secondary issue in chan_sip where the SDP being produced would be incorrect if the formats were considered incompatible. This has now been fixed by checking that all information required to produce the SDP is available instead of assuming it is. (closes issue ASTERISK-20464) Reported by: Leif Madsen git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@373413 65c4cc65-6c06-0410-ace0-fbb531ad65f3 --- channels/chan_sip.c | 24 +++++++++++++++--------- res/res_format_attr_h264.c | 9 +++++---- 2 files changed, 20 insertions(+), 13 deletions(-) diff --git a/channels/chan_sip.c b/channels/chan_sip.c index 6e386e19bc..6d9a2cf3c6 100644 --- a/channels/chan_sip.c +++ b/channels/chan_sip.c @@ -12227,11 +12227,17 @@ static void add_codec_to_sdp(const struct sip_pvt *p, { int rtp_code; struct ast_format_list fmt; + const char *mime; + unsigned int rate; if (debug) ast_verbose("Adding codec %d (%s) to SDP\n", format->id, ast_getformatname(format)); - if ((rtp_code = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(p->rtp), 1, format, 0)) == -1) + + if (((rtp_code = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(p->rtp), 1, format, 0)) == -1) || + !(mime = ast_rtp_lookup_mime_subtype2(1, format, 0, ast_test_flag(&p->flags[0], SIP_G726_NONSTANDARD) ? AST_RTP_OPT_G726_NONSTANDARD : 0)) || + !(rate = ast_rtp_lookup_sample_rate2(1, format, 0))) { return; + } if (p->rtp) { struct ast_codec_pref *pref = &ast_rtp_instance_get_codecs(p->rtp)->pref; @@ -12239,10 +12245,7 @@ static void add_codec_to_sdp(const struct sip_pvt *p, } else /* I don't see how you couldn't have p->rtp, but good to check for and error out if not there like earlier code */ return; ast_str_append(m_buf, 0, " %d", rtp_code); - ast_str_append(a_buf, 0, "a=rtpmap:%d %s/%d\r\n", - rtp_code, - ast_rtp_lookup_mime_subtype2(1, format, 0, ast_test_flag(&p->flags[0], SIP_G726_NONSTANDARD) ? AST_RTP_OPT_G726_NONSTANDARD : 0), - ast_rtp_lookup_sample_rate2(1, format, 0)); + ast_str_append(a_buf, 0, "a=rtpmap:%d %s/%d\r\n", rtp_code, mime, rate); ast_format_sdp_generate(format, rtp_code, a_buf); @@ -12288,6 +12291,8 @@ static void add_vcodec_to_sdp(const struct sip_pvt *p, struct ast_format *format int debug, int *min_packet_size) { int rtp_code; + const char *subtype; + unsigned int rate; if (!p->vrtp) return; @@ -12295,13 +12300,14 @@ static void add_vcodec_to_sdp(const struct sip_pvt *p, struct ast_format *format if (debug) ast_verbose("Adding video codec %d (%s) to SDP\n", format->id, ast_getformatname(format)); - if ((rtp_code = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(p->vrtp), 1, format, 0)) == -1) + if (((rtp_code = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(p->vrtp), 1, format, 0)) == -1) || + !(subtype = ast_rtp_lookup_mime_subtype2(1, format, 0, 0)) || + !(rate = ast_rtp_lookup_sample_rate2(1, format, 0))) { return; + } ast_str_append(m_buf, 0, " %d", rtp_code); - ast_str_append(a_buf, 0, "a=rtpmap:%d %s/%d\r\n", rtp_code, - ast_rtp_lookup_mime_subtype2(1, format, 0, 0), - ast_rtp_lookup_sample_rate2(1, format, 0)); + ast_str_append(a_buf, 0, "a=rtpmap:%d %s/%d\r\n", rtp_code, subtype, rate); ast_format_sdp_generate(format, rtp_code, a_buf); } diff --git a/res/res_format_attr_h264.c b/res/res_format_attr_h264.c index 3b62b74c0f..9642c51f1a 100644 --- a/res/res_format_attr_h264.c +++ b/res/res_format_attr_h264.c @@ -74,11 +74,12 @@ enum h264_attr_keys { static enum ast_format_cmp_res h264_format_attr_cmp(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2) { - unsigned int idc1 = fattr1->format_attr[H264_ATTR_KEY_PROFILE_IDC] ? fattr1->format_attr[H264_ATTR_KEY_PROFILE_IDC] : 0x42; - unsigned int idc2 = fattr2->format_attr[H264_ATTR_KEY_PROFILE_IDC] ? fattr2->format_attr[H264_ATTR_KEY_PROFILE_IDC] : 0x42; + if (!fattr1->format_attr[H264_ATTR_KEY_PROFILE_IDC] || !fattr2->format_attr[H264_ATTR_KEY_PROFILE_IDC] || + (fattr1->format_attr[H264_ATTR_KEY_PROFILE_IDC] == fattr2->format_attr[H264_ATTR_KEY_PROFILE_IDC])) { + return AST_FORMAT_CMP_EQUAL; + } - /* We are as permissive as possible to ensure the maximum number of calls succeed */ - return (idc1 == idc2) ? AST_FORMAT_CMP_EQUAL : AST_FORMAT_CMP_NOT_EQUAL; + return AST_FORMAT_CMP_NOT_EQUAL; } static int h264_format_attr_get_joint(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2, struct ast_format_attr *result) -- 2.47.2