/*
* Internal function for collecting codec info and param from the SDP media.
*/
static pj_status_t get_audio_codec_info_param(pjmedia_stream_info *si,
pj_pool_t *pool,
pjmedia_codec_mgr *mgr,
const pjmedia_sdp_media *local_m,
const pjmedia_sdp_media *rem_m)
{
const pjmedia_sdp_attr *attr;
pjmedia_sdp_rtpmap *rtpmap;
unsigned i, fmti, pt = 0;
pj_status_t status;
/* Find the first codec which is not telephone-event */
for ( fmti = 0; fmti < local_m->desc.fmt_count; ++fmti ) {
pjmedia_sdp_rtpmap r;
if ( !pj_isdigit(*local_m->desc.fmt[fmti].ptr) )
return PJMEDIA_EINVALIDPT;
pt = pj_strtoul(&local_m->desc.fmt[fmti]);
if (pt < 96) {
/* This is known static PT. Skip rtpmap checking because it is
* optional. */
break;
}
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL)
continue;
status = pjmedia_sdp_attr_get_rtpmap(attr, &r);
if (status != PJ_SUCCESS)
continue;
if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) != 0)
break;
}
if ( fmti >= local_m->desc.fmt_count )
return PJMEDIA_EINVALIDPT;
/* Get payload type for receiving direction */
si->rx_pt = pt;
/* Get codec info.
* For static payload types, get the info from codec manager.
* For dynamic payload types, MUST get the rtpmap.
*/
if (pt < 96) {
pj_bool_t has_rtpmap;
rtpmap = NULL;
has_rtpmap = PJ_TRUE;
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL) {
has_rtpmap = PJ_FALSE;
}
if (attr != NULL) {
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
has_rtpmap = PJ_FALSE;
}
/* Build codec format info: */
if (has_rtpmap) {
si->fmt.type = si->type;
si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]);
pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name);
si->fmt.clock_rate = rtpmap->clock_rate;
#if defined(PJMEDIA_HANDLE_G722_MPEG_BUG) && (PJMEDIA_HANDLE_G722_MPEG_BUG != 0)
/* The session info should have the actual clock rate, because
* this info is used for calculationg buffer size, etc in stream
*/
if (si->fmt.pt == PJMEDIA_RTP_PT_G722)
si->fmt.clock_rate = 16000;
#endif
/* For audio codecs, rtpmap parameters denotes the number of
* channels.
*/
if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) {
si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param);
} else {
si->fmt.channel_cnt = 1;
}
} else {
const pjmedia_codec_info *p_info;
status = pjmedia_codec_mgr_get_codec_info( mgr, pt, &p_info);
if (status != PJ_SUCCESS)
return status;
pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info));
}
/* For static payload type, pt's are symetric */
si->tx_pt = pt;
} else {
pjmedia_codec_id codec_id;
pj_str_t codec_id_st;
const pjmedia_codec_info *p_info;
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL)
return PJMEDIA_EMISSINGRTPMAP;
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
return status;
/* Build codec format info: */
si->fmt.type = si->type;
si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]);
si->fmt.encoding_name = rtpmap->enc_name;
si->fmt.clock_rate = rtpmap->clock_rate;
/* For audio codecs, rtpmap parameters denotes the number of
* channels.
*/
if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) {
si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param);
} else {
si->fmt.channel_cnt = 1;
}
/* Normalize the codec info from codec manager. Note that the
* payload type will be resetted to its default (it might have
* been rewritten by the SDP negotiator to match to the remote
* offer), this is intentional as currently some components may
* prefer (or even require) the default PT in codec info.
*/
pjmedia_codec_info_to_id(&si->fmt, codec_id, sizeof(codec_id));
i = 1;
codec_id_st = pj_str(codec_id);
status = pjmedia_codec_mgr_find_codecs_by_id(mgr, &codec_id_st,
&i, &p_info, NULL);
if (status != PJ_SUCCESS)
return status;
pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info));
/* Determine payload type for outgoing channel, by finding
* dynamic payload type in remote SDP that matches the answer.
*/
si->tx_pt = 0xFFFF;
for (i=0; i<rem_m->desc.fmt_count; ++i) {
if (pjmedia_sdp_neg_fmt_match(pool,
(pjmedia_sdp_media*)local_m, fmti,
(pjmedia_sdp_media*)rem_m, i, 0) ==
PJ_SUCCESS)
{
/* Found matched codec. */
si->tx_pt = pj_strtoul(&rem_m->desc.fmt[i]);
break;
}
}
if (si->tx_pt == 0xFFFF)
return PJMEDIA_EMISSINGRTPMAP;
}
/* Now that we have codec info, get the codec param. */
si->param = PJ_POOL_ALLOC_T(pool, pjmedia_codec_param);
status = pjmedia_codec_mgr_get_default_param(mgr, &si->fmt,
si->param);
/* Get remote fmtp for our encoder. */
pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt,
&si->param->setting.enc_fmtp);
/* Get local fmtp for our decoder. */
pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt,
&si->param->setting.dec_fmtp);
if (!pj_stricmp2(&si->fmt.encoding_name, "opus")) {
get_opus_channels_and_clock_rate(&si->param->setting.enc_fmtp,
&si->param->setting.dec_fmtp,
&si->fmt.channel_cnt,
&si->fmt.clock_rate);
}
/* Get the remote ptime for our encoder. */
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"ptime", NULL);
if (attr) {
pj_str_t tmp_val = attr->value;
unsigned frm_per_pkt;
pj_strltrim(&tmp_val);
/* Round up ptime when the specified is not multiple of frm_ptime */
frm_per_pkt = (pj_strtoul(&tmp_val) +
si->param->info.frm_ptime/2) /
si->param->info.frm_ptime;
if (frm_per_pkt != 0) {
si->param->setting.frm_per_pkt = (pj_uint8_t)frm_per_pkt;
}
}
/* Get remote maxptime for our encoder. */
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"maxptime", NULL);
if (attr) {
pj_str_t tmp_val = attr->value;
pj_strltrim(&tmp_val);
si->tx_maxptime = pj_strtoul(&tmp_val);
}
/* When direction is NONE (it means SDP negotiation has failed) we don't
* need to return a failure here, as returning failure will cause
* the whole SDP to be rejected. See ticket #:
* http://
*
* Thanks Alain Totouom
*/
if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE)
return status;
/* Get incomming payload type for telephone-events */
si->rx_event_pt = -1;
for (i=0; i<local_m->attr_count; ++i) {
pjmedia_sdp_rtpmap r;
attr = local_m->attr[i];
if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0)
continue;
if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS)
continue;
if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) {
si->rx_event_pt = pj_strtoul(&r.pt);
break;
}
}
/* Get outgoing payload type for telephone-events */
si->tx_event_pt = -1;
for (i=0; i<rem_m->attr_count; ++i) {
pjmedia_sdp_rtpmap r;
attr = rem_m->attr[i];
if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0)
continue;
if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS)
continue;
if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) {
si->tx_event_pt = pj_strtoul(&r.pt);
break;
}
}
return PJ_SUCCESS;
}
/*
* Internal function for collecting codec info and param from the SDP media.
*/
static pj_status_t get_video_codec_info_param(pjmedia_vid_stream_info *si,
pj_pool_t *pool,
pjmedia_vid_codec_mgr *mgr,
const pjmedia_sdp_media *local_m,
const pjmedia_sdp_media *rem_m)
{
unsigned pt = 0;
const pjmedia_vid_codec_info *p_info;
pj_status_t status;
pt = pj_strtoul(&local_m->desc.fmt[0]);
/* Get payload type for receiving direction */
si->rx_pt = pt;
/* Get codec info and payload type for transmitting direction. */
if (pt < 96) {
/* For static payload types, get the codec info from codec manager. */
status = pjmedia_vid_codec_mgr_get_codec_info(mgr, pt, &p_info);
if (status != PJ_SUCCESS)
return status;
si->codec_info = *p_info;
/* Get payload type for transmitting direction.
* For static payload type, pt's are symetric.
*/
si->tx_pt = pt;
} else {
const pjmedia_sdp_attr *attr;
pjmedia_sdp_rtpmap *rtpmap;
pjmedia_codec_id codec_id;
pj_str_t codec_id_st;
unsigned i;
/* Determine payload type for outgoing channel, by finding
* dynamic payload type in remote SDP that matches the answer.
*/
si->tx_pt = 0xFFFF;
for (i=0; i<rem_m->desc.fmt_count; ++i) {
if (pjmedia_sdp_neg_fmt_match(NULL,
(pjmedia_sdp_media*)local_m, 0,
(pjmedia_sdp_media*)rem_m, i, 0) ==
PJ_SUCCESS)
{
/* Found matched codec. */
si->tx_pt = pj_strtoul(&rem_m->desc.fmt[i]);
break;
}
}
if (si->tx_pt == 0xFFFF)
return PJMEDIA_EMISSINGRTPMAP;
/* For dynamic payload types, get codec name from the rtpmap */
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[0]);
if (attr == NULL)
return PJMEDIA_EMISSINGRTPMAP;
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
return status;
/* Then get the codec info from the codec manager */
pj_ansi_snprintf(codec_id, sizeof(codec_id), "%.*s/",
(int)rtpmap->enc_name.slen, rtpmap->enc_name.ptr);
codec_id_st = pj_str(codec_id);
i = 1;
status = pjmedia_vid_codec_mgr_find_codecs_by_id(mgr, &codec_id_st,
&i, &p_info, NULL);
if (status != PJ_SUCCESS)
return status;
si->codec_info = *p_info;
}
/* Request for codec with the correct packing for streaming */
si->codec_info.packings = PJMEDIA_VID_PACKING_PACKETS;
/* Now that we have codec info, get the codec param. */
si->codec_param = PJ_POOL_ALLOC_T(pool, pjmedia_vid_codec_param);
status = pjmedia_vid_codec_mgr_get_default_param(mgr,
&si->codec_info,
si->codec_param);
/* Adjust encoding bitrate, if higher than remote preference. The remote
* bitrate preference is read from SDP "b=TIAS" line in media level.
*/
if ((si->dir & PJMEDIA_DIR_ENCODING) && rem_m->bandw_count) {
unsigned i, bandw = 0;
for (i = 0; i < rem_m->bandw_count; ++i) {
const pj_str_t STR_BANDW_MODIFIER_TIAS = { "TIAS", 4 };
if (!pj_stricmp(&rem_m->bandw[i]->modifier,
&STR_BANDW_MODIFIER_TIAS))
{
bandw = rem_m->bandw[i]->value;
break;
}
}
if (bandw) {
pjmedia_video_format_detail *enc_vfd;
enc_vfd = pjmedia_format_get_video_format_detail(
&si->codec_param->enc_fmt, PJ_TRUE);
if (!enc_vfd->avg_bps || enc_vfd->avg_bps > bandw)
enc_vfd->avg_bps = bandw * 3 / 4;
if (!enc_vfd->max_bps || enc_vfd->max_bps > bandw)
enc_vfd->max_bps = bandw;
}
}
/* Get remote fmtp for our encoder. */
pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt,
&si->codec_param->enc_fmtp);
/* Get local fmtp for our decoder. */
pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt,
&si->codec_param->dec_fmtp);
/* When direction is NONE (it means SDP negotiation has failed) we don't
* need to return a failure here, as returning failure will cause
* the whole SDP to be rejected. See ticket #:
* http://
*
* Thanks Alain Totouom
*/
if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE)
return status;
return PJ_SUCCESS;
}
