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Add support for parsing SDP attributes, generating SDP attributes, and passing it through.

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This support includes codecs such as H.263, H.264, SILK, and CELT. You are able to set up a call and have attribute information pass. This should help considerably with video calls.

Review: https://reviewboard.asterisk.org/r/2005/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@370055 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Joshua Colp
2012-07-13 16:49:40 +00:00
parent 2603707f30
commit a693fd1d87
6 changed files with 180 additions and 41 deletions
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32
res/res_format_attr_silk.c
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@@ -47,6 +47,36 @@ struct silk_attr {
unsigned int packetloss_percentage;
};
static int silk_sdp_parse(struct ast_format_attr *format_attr, const char *attributes)
{
struct silk_attr *attr = (struct silk_attr *) format_attr;
unsigned int val;
if (sscanf(attributes, "maxaveragebitrate=%30u", &val) == 1) {
attr->maxbitrate = val;
}
if (sscanf(attributes, "usedtx=%30u", &val) == 1) {
attr->dtx = val;
}
if (sscanf(attributes, "useinbandfec=%30u", &val) == 1) {
attr->fec = val;
}
return 0;
}
static void silk_sdp_generate(const struct ast_format_attr *format_attr, unsigned int payload, struct ast_str **str)
{
struct silk_attr *attr = (struct silk_attr *) format_attr;
if ((attr->maxbitrate > 5000) && (attr->maxbitrate < 40000)) {
ast_str_append(str, 0, "a=fmtp:%d maxaveragebitrate=%d\r\n", payload, attr->maxbitrate);
}
ast_str_append(str, 0, "a=fmtp:%d usedtx=%d\r\n", payload, attr->dtx);
ast_str_append(str, 0, "a=fmtp:%d useinbandfec=%d\r\n", payload, attr->fec);
}
static enum ast_format_cmp_res silk_cmp(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2)
{
struct silk_attr *attr1 = (struct silk_attr *) fattr1;
@@ -195,6 +225,8 @@ static struct ast_format_attr_interface silk_interface = {
.format_attr_set = silk_set,
.format_attr_isset = silk_isset,
.format_attr_get_val = silk_get_val,
.format_attr_sdp_parse = silk_sdp_parse,
.format_attr_sdp_generate = silk_sdp_generate,
};
static int load_module(void)