[vlc-devel] [PATCH] live555: retrieve RTSP track languages from SDP

[Gilles Chanteperdrix]

First for the "a=lang:" session attribute, then for each subsession
look for the same attribute, and use the session attribute if none
was found.
---
 modules/access/live555.cpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/modules/access/live555.cpp b/modules/access/live555.cpp
index b9ed723..869904e 100644
--- a/modules/access/live555.cpp
+++ b/modules/access/live555.cpp
@@ -685,6 +685,8 @@ static int SessionsSetup( demux_t *p_demux )
     unsigned int   i_receive_buffer = 0;
     int            i_frame_buffer = DEFAULT_FRAME_BUFFER_SIZE;
     unsigned const thresh = 200000; /* RTP reorder threshold .2 second (default .1) */
+    const char     *p_sess_lang = NULL;
+    const char     *p_lang;
 
     b_rtsp_tcp    = var_CreateGetBool( p_demux, "rtsp-tcp" ) ||
                     var_GetBool( p_demux, "rtsp-http" );
@@ -699,6 +701,19 @@ static int SessionsSetup( demux_t *p_demux )
         return VLC_EGENERIC;
     }
 
+    if (strcmp(p_sys->p_sdp, "m=") != 0) {
+        const char *p_sess_attr_end;
+
+        p_sess_attr_end = strstr(p_sys->p_sdp, "\nm=");
+        if (!p_sess_attr_end)
+            p_sess_attr_end = strstr(p_sys->p_sdp, "\rm=");
+
+        p_sess_lang = p_sess_attr_end ? strstr(p_sys->p_sdp, "a=lang:") : NULL;
+        if (p_sess_lang && 
+            p_sess_lang - p_sys->p_sdp > p_sess_attr_end - p_sys->p_sdp)
+            p_sess_lang = NULL;
+    }
+
     /* Initialise each media subsession */
     iter = new MediaSubsessionIterator( *p_sys->ms );
     while( ( sub = iter->next() ) != NULL )
@@ -1090,6 +1105,18 @@ static int SessionsSetup( demux_t *p_demux )
                 }
             }
 
+            /* Try and parse a=lang: attribute */
+            p_lang = strstr(sub->savedSDPLines(), "a=lang:");
+            if (!p_lang)
+                p_lang = p_sess_lang;
+            
+            if (p_lang) {
+                unsigned i_lang_len;
+                p_lang += 7;
+                i_lang_len = strcspn(p_lang, " \r\n");
+                tk->fmt.psz_language = strndup(p_lang, i_lang_len);
+            }
+
             if( !tk->b_quicktime && !tk->b_muxed && !tk->b_asf )
             {
                 tk->p_es = es_out_Add( p_demux->out, &tk->fmt );
-- 
1.8.5.1