Changeset 5239 for pjproject/trunk/pjmedia/src/pjmedia/stream_info.c

Timestamp:

Feb 4, 2016 6:11:58 AM (7 years ago)

Author:

ming

Message:

Fixed #1904: Support for Opus codec

File:

• pjproject/trunk/pjmedia/src/pjmedia/stream_info.c (modified) (2 diffs)

pjproject/trunk/pjmedia/src/pjmedia/stream_info.c

@@ -34 +34 @@
 static const pj_str_t ID_TELEPHONE_EVENT = { "telephone-event", 15 };
 
+static void get_opus_channels_and_clock_rate(const pjmedia_codec_fmtp *enc_fmtp,
+                                             const pjmedia_codec_fmtp *dec_fmtp,
+                                             unsigned *channel_cnt,
+                                             unsigned *clock_rate)
+{
+    unsigned i;
+    unsigned enc_channel_cnt = 0, local_channel_cnt = 0;
+    unsigned enc_clock_rate = 0, local_clock_rate = 0;
+
+    for (i = 0; i < dec_fmtp->cnt; ++i) {
+        if (!pj_stricmp2(&dec_fmtp->param[i].name, "sprop-maxcapturerate")) {
+            local_clock_rate = (unsigned)pj_strtoul(&dec_fmtp->param[i].val);
+        } else if (!pj_stricmp2(&dec_fmtp->param[i].name, "sprop-stereo")) {
+            local_channel_cnt = (unsigned)pj_strtoul(&dec_fmtp->param[i].val);
+            local_channel_cnt = (local_channel_cnt > 0) ? 2 : 1;
+        }
+    }
+    if (!local_clock_rate) local_clock_rate = *clock_rate;
+    if (!local_channel_cnt) local_channel_cnt = *channel_cnt;
+
+    for (i = 0; i < enc_fmtp->cnt; ++i) {
+        if (!pj_stricmp2(&enc_fmtp->param[i].name, "maxplaybackrate")) {
+            enc_clock_rate = (unsigned)pj_strtoul(&enc_fmtp->param[i].val);
+        } else if (!pj_stricmp2(&enc_fmtp->param[i].name, "stereo")) {
+            enc_channel_cnt = (unsigned)pj_strtoul(&enc_fmtp->param[i].val);
+            enc_channel_cnt = (enc_channel_cnt > 0) ? 2 : 1;
+        }
+    }
+    /* The default is a standard mono session with 48000 Hz clock rate
+     * (RFC 7587, section 7)
+     */
+    if (!enc_clock_rate) enc_clock_rate = 48000;
+    if (!enc_channel_cnt) enc_channel_cnt = 1;
+
+    *clock_rate = (enc_clock_rate < local_clock_rate) ? enc_clock_rate :
+                  local_clock_rate;
+
+    *channel_cnt = (enc_channel_cnt < local_channel_cnt) ? enc_channel_cnt :
+                   local_channel_cnt;
+}
+
 /*
  * Internal function for collecting codec info and param from the SDP media.
@@ -218 +259 @@
     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. */