Add MimeUtil::Parse{Audio|Video}CodecString

media/base/video_codecs.cc

 // Copyright 2015 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/video_codecs.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 219 matching lines @@
                            ? gfx::ColorSpace::RangeID::FULL
                            : gfx::ColorSpace::RangeID::LIMITED;
 
   return true;
 }
 
 bool ParseLegacyVp9CodecID(const std::string& codec_id,
                            VideoCodecProfile* profile,
                            uint8_t* level_idc) {
   if (codec_id == "vp9" || codec_id == "vp9.0") {
-    // Profile is not included in the codec string. Assuming profile 0 to be
-    // backward compatible.
-    *profile = VP9PROFILE_PROFILE0;
+    // Profile is not included in the codec string. Consumers of parsed codec
+    // should handle by rejecting ambiguous string or resolving to a default
+    // profile.
+    *profile = VIDEO_CODEC_PROFILE_UNKNOWN;
     // Use 0 to indicate unknown level.
     *level_idc = 0;
     return true;
   }
   return false;
 }
 
 bool ParseAVCCodecId(const std::string& codec_id,
                      VideoCodecProfile* profile,
                      uint8_t* level_idc) {
@@ skipping 371 matching lines @@
     return kCodecHEVC;
 #endif
 #if BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
   if (ParseDolbyVisionCodecId(codec_id, &profile, &level))
     return kCodecDolbyVision;
 #endif
   return kUnknownVideoCodec;
 }
 
 }  // namespace media