AAC support in the SDP generator

Originally committed as revision 10398 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/sdp.c

@@ -110,32 +110,61 @@ static char *data_to_hex(char *buff, const uint8_t *src, int s)
     return buff;
 }
 
-static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
+static char *extradata2config(const uint8_t *extradata, int extradata_size)
 {
-    char *config = NULL;
+    char *config;
 
-    switch (c->codec_id) {
-        case CODEC_ID_MPEG4:
-            if (c->flags & CODEC_FLAG_GLOBAL_HEADER) {
-                if (c->extradata_size > MAX_EXTRADATA_SIZE) {
+    if (extradata_size > MAX_EXTRADATA_SIZE) {
         av_log(NULL, AV_LOG_ERROR, "Too many extra data!\n");
 
         return NULL;
     }
-                config = av_malloc(10 + c->extradata_size * 2);
+    config = av_malloc(10 + extradata_size * 2);
     if (config == NULL) {
         av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");
         return NULL;
     }
     memcpy(config, "; config=", 9);
-                data_to_hex(config + 9, c->extradata, c->extradata_size);
-                config[9 + c->extradata_size * 2] = 0;
+    data_to_hex(config + 9, extradata, extradata_size);
+    config[9 + extradata_size * 2] = 0;
+
+    return config;
+}
+
+static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
+{
+    char *config = NULL;
+
+    switch (c->codec_id) {
+        case CODEC_ID_MPEG4:
+            if (c->flags & CODEC_FLAG_GLOBAL_HEADER) {
+                config = extradata2config(c->extradata, c->extradata_size);
             }
             av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
                                     "a=fmtp:%d profile-level-id=1%s\r\n",
                                      payload_type,
                                      payload_type, config ? config : "");
             break;
+        case CODEC_ID_AAC:
+            if (c->flags & CODEC_FLAG_GLOBAL_HEADER) {
+                config = extradata2config(c->extradata, c->extradata_size);
+            } else {
+                /* FIXME: maybe we can forge config information based on the
+                 *        codec parameters...
+                 */
+                av_log(NULL, AV_LOG_ERROR, "AAC with no global headers is currently not supported\n");
+                return NULL;
+            }
+            if (config == NULL) {
+                return NULL;
+            }
+            av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
+                                    "a=fmtp:%d profile-level-id=1;"
+                                    "mode=AAC-hbr;sizelength=13;indexlength=3;"
+                                    "indexdeltalength=3%s\r\n",
+                                     payload_type, c->sample_rate, c->channels,
+                                     payload_type, config);
+            break;
         default:
             /* Nothing special to do, here... */
             break;