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sdp: Add support for T.38

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This change adds a T.38 format which can be used in a stream
topology to specify that a UDPTL stream needs to be created.
The SDP API has been changed to understand T.38 and create
the UDPTL session, add the attributes, and parse the attributes.

This change does not change the boundary of the T.38 state
machine. It is still up to the channel driver to implement and
act on it (such as queueing control frames or reacting to them).

ASTERISK-26949

Change-Id: If28956762ccb8ead562ac6c03d162d3d6014f2c7
This commit is contained in:
Joshua Colp
2017-04-14 10:21:13 +00:00
committed by Richard Mudgett
parent 32b3e36c68
commit 19a79ae12c
10 changed files with 623 additions and 47 deletions
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61
main/sdp.c
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@@ -23,6 +23,7 @@
#include "asterisk/codec.h"
#include "asterisk/format.h"
#include "asterisk/format_cap.h"
#include "asterisk/format_cache.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/sdp_state.h"
#include "asterisk/sdp_options.h"
@@ -712,34 +713,56 @@ static struct ast_stream *get_stream_from_m(const struct ast_sdp_m_line *m_line)
ao2_ref(caps, -1);
return NULL;
}
ast_rtp_codecs_payloads_initialize(&codecs);
for (i = 0; i < ast_sdp_m_get_payload_count(m_line); ++i) {
struct ast_sdp_payload *payload_s;
struct ast_sdp_rtpmap *rtpmap;
int payload;
switch (ast_stream_get_type(stream)) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
ast_rtp_codecs_payloads_initialize(&codecs);
payload_s = ast_sdp_m_get_payload(m_line, i);
sscanf(payload_s->fmt, "%30d", &payload);
ast_rtp_codecs_payloads_set_m_type(&codecs, NULL, payload);
for (i = 0; i < ast_sdp_m_get_payload_count(m_line); ++i) {
struct ast_sdp_payload *payload_s;
struct ast_sdp_rtpmap *rtpmap;
int payload;
rtpmap = sdp_payload_get_rtpmap(m_line, payload);
if (!rtpmap) {
continue;
payload_s = ast_sdp_m_get_payload(m_line, i);
sscanf(payload_s->fmt, "%30d", &payload);
ast_rtp_codecs_payloads_set_m_type(&codecs, NULL, payload);
rtpmap = sdp_payload_get_rtpmap(m_line, payload);
if (!rtpmap) {
continue;
}
ast_rtp_codecs_payloads_set_rtpmap_type_rate(&codecs, NULL,
payload, m_line->type, rtpmap->encoding_name, 0,
rtpmap->clock_rate);
ast_sdp_rtpmap_free(rtpmap);
process_fmtp(m_line, payload, &codecs);
}
ast_rtp_codecs_payloads_set_rtpmap_type_rate(&codecs, NULL,
payload, m_line->type, rtpmap->encoding_name, 0,
rtpmap->clock_rate);
ast_sdp_rtpmap_free(rtpmap);
process_fmtp(m_line, payload, &codecs);
ast_rtp_codecs_payload_formats(&codecs, caps, &non_ast_fmts);
ast_rtp_codecs_payloads_destroy(&codecs);
break;
case AST_MEDIA_TYPE_IMAGE:
for (i = 0; i < ast_sdp_m_get_payload_count(m_line); ++i) {
struct ast_sdp_payload *payload;
/* As we don't carry T.38 over RTP we do our own format check */
payload = ast_sdp_m_get_payload(m_line, i);
if (!strcasecmp(payload->fmt, "t38")) {
ast_format_cap_append(caps, ast_format_t38, 0);
}
}
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
ast_rtp_codecs_payload_formats(&codecs, caps, &non_ast_fmts);
ast_stream_set_formats(stream, caps);
ao2_ref(caps, -1);
ast_rtp_codecs_payloads_destroy(&codecs);
return stream;
}