diff options
Diffstat (limited to 'pjmedia/include/pjmedia/sdp_neg.h')
| -rw-r--r-- | pjmedia/include/pjmedia/sdp_neg.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/pjmedia/include/pjmedia/sdp_neg.h b/pjmedia/include/pjmedia/sdp_neg.h index bc36b19e..bc8c52cb 100644 --- a/pjmedia/include/pjmedia/sdp_neg.h +++ b/pjmedia/include/pjmedia/sdp_neg.h @@ -663,6 +663,95 @@ PJ_DECL(pj_status_t) pjmedia_sdp_neg_negotiate( pj_pool_t *pool, pj_bool_t allow_asym); +/** + * Enumeration of customized SDP format matching option flags. See + * #pjmedia_sdp_neg_register_fmt_match_cb() for more info. + */ +typedef enum pjmedia_sdp_neg_fmt_match_flag +{ + /** + * In generating answer, the SDP fmtp in the answer candidate may need + * to be modified by the customized SDP format matching callback to + * achieve flexible SDP negotiation, e.g: AMR fmtp 'octet-align' field + * can be adjusted with the offer when the codec implementation support + * both packetization modes octet-aligned and bandwidth-efficient. + */ + PJMEDIA_SDP_NEG_FMT_MATCH_ALLOW_MODIFY_ANSWER = 1, + +} pjmedia_sdp_neg_fmt_match_flag; + + +/** + * The declaration of customized SDP format matching callback. See + * #pjmedia_sdp_neg_register_fmt_match_cb() for more info. + * + * @param pool The memory pool. + * @param offer The SDP media offer. + * @param o_fmt_idx Index of the format in the SDP media offer. + * @param answer The SDP media answer. + * @param a_fmt_idx Index of the format in the SDP media answer. + * @param option The format matching option, see + * #pjmedia_sdp_neg_fmt_match_flag. + * + * @return PJ_SUCCESS when the formats in offer and answer match. + */ +typedef pj_status_t (*pjmedia_sdp_neg_fmt_match_cb)(pj_pool_t *pool, + pjmedia_sdp_media *offer, + unsigned o_fmt_idx, + pjmedia_sdp_media *answer, + unsigned a_fmt_idx, + unsigned option); + + +/** + * Register customized SDP format matching callback function for the specified + * format. The customized SDP format matching is needed when the format + * identification in a media stream session cannot be simply determined by + * encoding name and clock rate, but also involves one or more format specific + * parameters, which are specified in SDP fmtp attribute. For example, + * an H.264 video stream is also identified by profile, level, and + * packetization-mode parameters. As those parameters are format specifics, + * the negotiation must be done by the format or codec implementation. + * + * To unregister the callback of specific format, just call this function with + * parameter #cb set to NULL. + * + * @param fmt_name The format name, e.g: "H.264", "AMR", "G7221". Note + * that the string buffer must remain valid until the + * callback is unregistered. + * @param cb The customized SDP format negotiation callback or + * NULL to unregister the specified format callback. + * + * @return PJ_SUCCESS on success. + */ +PJ_DECL(pj_status_t) pjmedia_sdp_neg_register_fmt_match_cb( + const pj_str_t *fmt_name, + pjmedia_sdp_neg_fmt_match_cb cb); + + +/** + * Match format in the SDP media offer and answer. The matching mechanism + * will be done by comparing the encoding name and clock rate, and if the + * custom format matching callback for the specified format is registered, + * see #pjmedia_sdp_neg_register_fmt_match_cb(), it will be called for more + * detail verification, e.g: format parameters specified in SDP fmtp. + * + * @param pool The memory pool. + * @param offer The SDP media offer. + * @param o_fmt_idx Index of the format in the SDP media offer. + * @param answer The SDP media answer. + * @param a_fmt_idx Index of the format in the SDP media answer. + * @param option The format matching option, see + * #pjmedia_sdp_neg_fmt_match_flag. + * + * @return PJ_SUCCESS when the formats in offer and answer match. + */ +PJ_DECL(pj_status_t) pjmedia_sdp_neg_fmt_match( pj_pool_t *pool, + pjmedia_sdp_media *offer, + unsigned o_fmt_idx, + pjmedia_sdp_media *answer, + unsigned a_fmt_idx, + unsigned option); PJ_END_DECL |