Support multiple media tracks in MSE / ChunkDemuxer

media/base/audio_codecs.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/audio_codecs.h"
 
 #include "base/logging.h"
+#include "base/strings/string_util.h"
 
 namespace media {
 
 // These names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
 std::string GetCodecName(AudioCodec codec) {
   switch (codec) {
     case kUnknownAudioCodec:
       return "unknown";
     case kCodecAAC:
       return "aac";
@@ skipping 23 matching lines @@
       return "eac3";
     case kCodecALAC:
       return "alac";
     case kCodecAC3:
       return "ac3";
   }
   NOTREACHED();
   return "";
 }
 
+AudioCodec StringToAudioCodec(const std::string& codec_id) {
+  if (codec_id == "aac")
+    return kCodecAAC;
+  if (codec_id == "ac-3" || codec_id == "mp4a.A5")
+    return kCodecAC3;
+  if (codec_id == "ec-3" || codec_id == "mp4a.A6")
+    return kCodecEAC3;
+  if (codec_id == "mp3")
+    return kCodecMP3;
+  if (codec_id == "alac")
+    return kCodecALAC;
+  if (codec_id == "flac")
+    return kCodecFLAC;
+  if (codec_id == "opus")
+    return kCodecOpus;
+  if (codec_id == "vorbis")
+    return kCodecVorbis;
+  if (base::StartsWith(codec_id, "mp4a.40.", base::CompareCase::SENSITIVE))
+    return kCodecAAC;
+  return kUnknownAudioCodec;
+}
+
 }  // namespace media