Fix mpeg-1 layer2 parsing typo.

media/formats/mpeg/mpeg1_audio_stream_parser.cc

 // Copyright 2014 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/formats/mpeg/mpeg1_audio_stream_parser.h"
 
 #include "media/base/media_log.h"
 
 namespace media {
 
@@ skipping 120 matching lines @@
       bitrate_index == kBitrateFree || bitrate_index == kBitrateBad ||
       sample_rate_index == kSampleRateReserved) {
     MEDIA_LOG(ERROR, media_log)
         << "Invalid header data :" << std::hex << " sync 0x" << sync
         << " version 0x" << version << " layer 0x" << layer
         << " bitrate_index 0x" << bitrate_index << " sample_rate_index 0x"
         << sample_rate_index << " channel_mode 0x" << channel_mode;
     return false;
   }
 
-  if (layer == kLayer2 && kIsAllowed[bitrate_index][channel_mode]) {
+  if (layer == kLayer2 && !kIsAllowed[bitrate_index][channel_mode]) {
     MEDIA_LOG(ERROR, media_log) << "Invalid (bitrate_index, channel_mode)"
                                 << " combination :" << std::hex
                                 << " bitrate_index " << bitrate_index
                                 << " channel_mode " << channel_mode;
     return false;
   }
 
   int bitrate = kBitrateMap[bitrate_index][kVersionLayerMap[version][layer]];
 
   if (bitrate == 0) {
@@ skipping 131 matching lines @@
     if (metadata_frame)
       *metadata_frame = true;
     return header_bytes_read + reader.bits_read() / 8;
   }
 
   // If it wasn't a XING frame, just return the number consumed bytes.
   return header_bytes_read;
 }
 
 }  // namespace media