[TO M50] Enable implicit signalling for HE AAC v1 & v2 in ADTS.

media/base/audio_buffer.cc

 // Copyright 2013 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_buffer.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "media/base/audio_bus.h"
@@ skipping 190 matching lines @@
   return sample >> 16;
 }
 
 template <>
 inline int16_t ConvertSample<float, int16_t>(float sample) {
   return static_cast<int16_t>(
       nearbyint(sample < 0 ? (-sample) * std::numeric_limits<int16_t>::min()
                            : sample * std::numeric_limits<int16_t>::max()));
 }
 
+void AudioBuffer::AdjustSampleRate(int sample_rate) {
+  DCHECK(!end_of_stream_);
+  sample_rate_ = sample_rate;
+  duration_ = CalculateDuration(adjusted_frame_count_, sample_rate_);
+}
+
 void AudioBuffer::ReadFrames(int frames_to_copy,
                              int source_frame_offset,
                              int dest_frame_offset,
                              AudioBus* dest) {
   // Deinterleave each channel (if necessary) and convert to 32bit
   // floating-point with nominal range -1.0 -> +1.0 (if necessary).
 
   // |dest| must have the same number of channels, and the number of frames
   // specified must be in range.
   DCHECK(!end_of_stream());
@@ skipping 197 matching lines @@
     }
   } else {
     CHECK_EQ(frames_to_copy, 0);
   }
 
   // Trim the leftover data off the end of the buffer and update duration.
   TrimEnd(frames_to_trim);
 }
 
 }  // namespace media