Introduce AudioDecoderConfig to migrate away from GetAVStream().

media/base/audio_decoder_config.cc

+// Copyright (c) 2011 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_decoder_config.h"
+
+#include "base/logging.h"
+
+namespace media {
+
+AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
+                                       int bits_per_channel,
+                                       ChannelLayout channel_layout,
+                                       int sample_rate,
+                                       const uint8* extra_data,
+                                       size_t extra_data_size)
+    : codec_(codec),
+      bits_per_channel_(bits_per_channel),
+      channel_layout_(channel_layout),
+      sample_rate_(sample_rate),
+      extra_data_size_(extra_data_size) {
+  CHECK(extra_data_size_ == 0 || extra_data);

[Ami GONE FROM CHROMIUM, 2011/09/12 20:54:21]

CHECK, really?

[Ami GONE FROM CHROMIUM, 2011/09/12 20:54:21]

IWBN to assert the stronger:
(size!=0) == (data!=NULL)

[scherkus (not reviewing), 2011/09/19 21:19:45]

Done.

+  if (extra_data_size_ > 0) {
+    extra_data_.reset(new uint8[extra_data_size_]);
+    memcpy(extra_data_.get(), extra_data, extra_data_size_);
+  }
+}
+
+AudioDecoderConfig::~AudioDecoderConfig() {}
+
+AudioCodec AudioDecoderConfig::codec() const {
+  return codec_;
+}
+
+int AudioDecoderConfig::bits_per_channel() const {
+  return bits_per_channel_;
+}
+
+ChannelLayout AudioDecoderConfig::channel_layout() const {
+  return channel_layout_;
+}
+
+int AudioDecoderConfig::sample_rate() const {
+  return sample_rate_;
+}
+
+uint8* AudioDecoderConfig::extra_data() const {
+  return extra_data_.get();
+}
+
+size_t AudioDecoderConfig::extra_data_size() const {
+  return extra_data_size_;
+}
+
+}  // namespace media