added aac-he & aac-hev2 support

Author: arut

ngx_rtmp_codec_module.c

@@ -292,13 +292,11 @@ ngx_rtmp_codec_parse_aac_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
     ngx_rtmp_bit_read(&br, 16);
 
     ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 5);
-
     if (ctx->aac_profile == 31) {
         ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 6) + 32;
     }
 
     idx = (ngx_uint_t) ngx_rtmp_bit_read(&br, 4);
-
     if (idx == 15) {
         ctx->sample_rate = (ngx_uint_t) ngx_rtmp_bit_read(&br, 24);
     } else {
@@ -307,15 +305,45 @@ ngx_rtmp_codec_parse_aac_header(ngx_rtmp_session_t *s, ngx_chain_t *in)
 
     ctx->aac_chan_conf = (ngx_uint_t) ngx_rtmp_bit_read(&br, 4);
 
+    if (ctx->aac_profile == 5 || ctx->aac_profile == 29) {
+        
+        if (ctx->aac_profile == 29) {
+            ctx->aac_ps = 1;
+        }
+
+        ctx->aac_sbr = 1;
+
+        idx = (ngx_uint_t) ngx_rtmp_bit_read(&br, 4);
+        if (idx == 15) {
+            ctx->sample_rate = (ngx_uint_t) ngx_rtmp_bit_read(&br, 24);
+        } else {
+            ctx->sample_rate = aac_sample_rates[idx];
+        }
+
+        ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 5);
+        if (ctx->aac_profile == 31) {
+            ctx->aac_profile = (ngx_uint_t) ngx_rtmp_bit_read(&br, 6) + 32;
+        }
+    }
+
     /* MPEG-4 Audio Specific Config
 
        5 bits: object type
        if (object type == 31)
-       6 bits + 32: object type
-       --->4 bits: frequency index
+         6 bits + 32: object type
+       4 bits: frequency index
        if (frequency index == 15)
-       24 bits: frequency
+         24 bits: frequency
        4 bits: channel configuration
+
+       if (object_type == 5)
+           4 bits: frequency index
+           if (frequency index == 15)
+             24 bits: frequency
+           5 bits: object type
+           if (object type == 31)
+             6 bits + 32: object type
+             
        var bits: AOT Specific Config
      */
 

ngx_rtmp_codec_module.h

@@ -60,6 +60,8 @@ typedef struct {
     ngx_uint_t                  audio_codec_id;
     ngx_uint_t                  aac_profile;
     ngx_uint_t                  aac_chan_conf;
+    ngx_uint_t                  aac_sbr;
+    ngx_uint_t                  aac_ps;
     ngx_uint_t                  avc_profile;
     ngx_uint_t                  avc_compat;
     ngx_uint_t                  avc_level;

ngx_rtmp_stat_module.c

@@ -363,16 +363,24 @@ ngx_rtmp_stat_client(ngx_http_request_t *r, ngx_chain_t ***lll,
 
 
 static char *
-ngx_rtmp_stat_get_aac_profile(ngx_uint_t p) {
+ngx_rtmp_stat_get_aac_profile(ngx_uint_t p, ngx_uint_t sbr, ngx_uint_t ps) {
     switch (p) {
         case 1:
             return "Main";
         case 2:
+            if (ps) {
+                return "HEv2";
+            }
+            if (sbr) {
+                return "HE";
+            }
             return "LC";
         case 3:
             return "SSR";
         case 4:
             return "LTP";
+        case 5:
+            return "SBR";
         default:
             return "";
     }
@@ -526,7 +534,9 @@ ngx_rtmp_stat_live(ngx_http_request_t *r, ngx_chain_t ***lll,
                 if (codec->aac_profile) {
                     NGX_RTMP_STAT_L("<profile>");
                     NGX_RTMP_STAT_CS(
-                            ngx_rtmp_stat_get_aac_profile(codec->aac_profile));
+                            ngx_rtmp_stat_get_aac_profile(codec->aac_profile,
+                                                          codec->aac_sbr,
+                                                          codec->aac_ps));
                     NGX_RTMP_STAT_L("</profile>");
                 }
                 if (codec->aac_chan_conf) {