fix: Fire trackinfo for audio only transmuxers

lib/mp4/transmuxer.js

@@ -934,6 +934,12 @@ Transmuxer = function(options) {
           .pipe(pipeline.audioSegmentStream)
           .pipe(pipeline.coalesceStream);
       }
+
+      // emit pmt info
+      self.trigger('trackinfo', {
+        hasAudio: !!audioTrack,
+        hasVideo: !!videoTrack
+      });
     });
 
     // Re-emit any data coming from the coalesce stream to the outside world

lib/partial/transmuxer.js

@@ -165,11 +165,7 @@ var aacPipeline = function(options) {
     pipeline = {
     type: 'aac',
     tracks: {
-      audio: {
-        timelineStartInfo: {
-          baseMediaDecodeTime: options.baseMediaDecodeTime
-        }
-      }
+      audio: null
     },
     metadataStream: new m2ts.MetadataStream(),
     aacStream: new AacStream(),
@@ -197,9 +193,9 @@ var aacPipeline = function(options) {
       return;
     }
 
-    pipeline.tracks.audio = {
+    pipeline.tracks.audio = pipeline.tracks.audio || {
       timelineStartInfo: {
-        baseMediaDecodeTime: pipeline.tracks.audio.timelineStartInfo.baseMediaDecodeTime
+        baseMediaDecodeTime: options.baseMediaDecodeTime
       },
       codec: 'adts',
       type: 'audio'
@@ -208,19 +204,13 @@ var aacPipeline = function(options) {
     // hook up the audio segment stream to the first track with aac data
     pipeline.audioSegmentStream = new AudioSegmentStream(pipeline.tracks.audio, options);
 
-    pipeline.audioSegmentStream.on('timingInfo',
-      pipeline.trigger.bind(pipeline, 'audioTimingInfo'));
-
-    // Set up the final part of the audio pipeline
-    pipeline.adtsStream
-      .pipe(pipeline.audioSegmentStream);
-
     pipeline.audioSegmentStream.on('data', function(data) {
       pipeline.trigger('data', {
         type: 'audio',
         data: data
       });
     });
+
     pipeline.audioSegmentStream.on('partialdone',
                                    pipeline.trigger.bind(pipeline, 'partialdone'));
     pipeline.audioSegmentStream.on('done', pipeline.trigger.bind(pipeline, 'done'));
@@ -229,6 +219,14 @@ var aacPipeline = function(options) {
     pipeline.audioSegmentStream.on('timingInfo',
                                    pipeline.trigger.bind(pipeline, 'audioTimingInfo'));
 
+    // Set up the final part of the audio pipeline
+    pipeline.adtsStream
+      .pipe(pipeline.audioSegmentStream);
+
+    pipeline.trigger('trackinfo', {
+      hasAudio: !!pipeline.tracks.audio,
+      hasVideo: !!pipeline.tracks.video
+    });
   });
 
   // set the pipeline up as a stream before binding to get access to the trigger function
@@ -266,6 +264,7 @@ var Transmuxer = function(options) {
     hasFlushed = true;
 
   Transmuxer.prototype.init.call(this);
+  options.baseMediaDecodeTime = options.baseMediaDecodeTime || 0;
 
   this.push = function(bytes) {
     if (hasFlushed) {