Add HE AAC support to ISO BMFF.

media/mp4/mp4_stream_parser.cc

 // Copyright (c) 2012 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/mp4/mp4_stream_parser.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/time.h"
 #include "media/base/audio_decoder_config.h"
@@ skipping 145 matching lines @@
     if (track->media.handler.type == kAudio && !audio_config.IsValidConfig()) {
       RCHECK(!samp_descr.audio_entries.empty());
       const AudioSampleEntry& entry = samp_descr.audio_entries[0];
 
       // TODO(strobe): We accept all format values, pending clarification on
       // the formats used for encrypted media (http://crbug.com/132351).
       //  RCHECK(entry.format == FOURCC_MP4A ||
       //         (entry.format == FOURCC_ENCA &&
       //          entry.sinf.format.format == FOURCC_MP4A));
 
-      const ChannelLayout layout =
-          AVC::ConvertAACChannelCountToChannelLayout(entry.channelcount);
-      audio_config.Initialize(kCodecAAC, entry.samplesize, layout,
-                              entry.samplerate, NULL, 0, false);
+      aac_ = entry.esds.aac;

[acolwell GONE FROM CHROMIUM, 2012/06/28 17:31:25]

What protects this code from other audio codecs being in the file like AMR-NB or
MP3?

+      audio_config.Initialize(kCodecAAC, entry.samplesize,
+                              aac_.channel_layout(), aac_.frequency(),
+                              NULL, 0, false);
+
       has_audio_ = true;
       audio_track_id_ = track->header.track_id;
     }
     if (track->media.handler.type == kVideo && !video_config.IsValidConfig()) {
       RCHECK(!samp_descr.video_entries.empty());
       const VideoSampleEntry& entry = samp_descr.video_entries[0];
 
       //  RCHECK(entry.format == FOURCC_AVC1 ||
       //         (entry.format == FOURCC_ENCV &&
       //          entry.sinf.format.format == FOURCC_AVC1));
@@ skipping 100 matching lines @@
               sample_table.description.video_entries[0].avcc;
           break;
         }
       }
       RCHECK(avc_config != NULL);
       RCHECK(AVC::InsertParameterSets(*avc_config, &frame_buf));
       parameter_sets_inserted_ = true;
     }
   }
 
+  if (audio) {
+    aac_.ConvertEsdsToADTS(&frame_buf);
+  }
+
   scoped_refptr<StreamParserBuffer> stream_buf =
     StreamParserBuffer::CopyFrom(&frame_buf[0], frame_buf.size(),
                                  runs_.is_keyframe());
 
   stream_buf->SetDuration(runs_.duration());
   // We depend on the decoder performing frame reordering without reordering
   // timestamps, and only provide the decode timestamp in the buffer.
   stream_buf->SetTimestamp(runs_.dts());
 
   DVLOG(3) << "Pushing frame: aud=" << audio
@@ skipping 52 matching lines @@
   return true;
 }
 
 void MP4StreamParser::ChangeState(State new_state) {
   DVLOG(2) << "Changing state: " << new_state;
   state_ = new_state;
 }
 
 }  // namespace mp4
 }  // namespace media