Changeset 3955 for pjproject/trunk

Timestamp:

Feb 20, 2012 3:30:54 AM (13 years ago)

Author:

nanang

Message:

Re #1244: Added bitrate adjustment for video encoder based on remote SDP "b=TIAS" line in media level.

File:

• pjproject/trunk/pjmedia/src/pjmedia/vid_stream.c (modified) (1 diff)

pjproject/trunk/pjmedia/src/pjmedia/vid_stream.c

@@ -1892 +1892 @@
                                                      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,