1 files changed, 112 insertions, 0 deletions
diff --git a/media/webm/webm_audio_client.cc b/media/webm/webm_audio_client.cc
new file mode 100644
index 0000000..e52f44b
--- /dev/null
+++ b/media/webm/webm_audio_client.cc
@@ -0,0 +1,112 @@
+// Copyright (c) 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/webm/webm_audio_client.h"
+
+#include "media/base/audio_decoder_config.h"
+#include "media/base/channel_layout.h"
+#include "media/webm/webm_constants.h"
+
+namespace media {
+
+WebMAudioClient::WebMAudioClient(const LogCB& log_cb)
+    : log_cb_(log_cb) {
+  Reset();
+}
+
+WebMAudioClient::~WebMAudioClient() {
+}
+
+void WebMAudioClient::Reset() {
+  channels_ = -1;
+  samples_per_second_ = -1;
+  output_samples_per_second_ = -1;
+}
+
+bool WebMAudioClient::InitializeConfig(
+    const std::string& codec_id, const std::vector<uint8>& codec_private,
+    bool is_encrypted, AudioDecoderConfig* config) {
+  DCHECK(config);
+
+  AudioCodec audio_codec = kUnknownAudioCodec;
+  if (codec_id == "A_VORBIS") {
+    audio_codec = kCodecVorbis;
+  } else {
+    MEDIA_LOG(log_cb_) << "Unsupported audio codec_id " << codec_id;
+    return false;
+  }
+
+  if (samples_per_second_ <= 0)
+    return false;
+
+  // Set channel layout default if a Channels element was not present.
+  if (channels_ == -1)
+    channels_ = 1;
+
+  ChannelLayout channel_layout =  GuessChannelLayout(channels_);
+
+  if (channel_layout == CHANNEL_LAYOUT_UNSUPPORTED) {
+    MEDIA_LOG(log_cb_) << "Unsupported channel count " << channels_;
+    return false;
+  }
+
+  int samples_per_second = samples_per_second_;
+  if (output_samples_per_second_ > 0)
+    samples_per_second = output_samples_per_second_;
+
+  const uint8* extra_data = NULL;
+  size_t extra_data_size = 0;
+  if (codec_private.size() > 0) {
+    extra_data = &codec_private[0];
+    extra_data_size = codec_private.size();
+  }
+
+  config->Initialize(
+      audio_codec, kSampleFormatPlanarF32, channel_layout,
+      samples_per_second, extra_data, extra_data_size, is_encrypted, true);
+  return config->IsValidConfig();
+}
+
+bool WebMAudioClient::OnUInt(int id, int64 val) {
+  if (id == kWebMIdChannels) {
+    if (channels_ != -1) {
+      MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
+                         << " specified. (" << channels_ << " and " << val
+                         << ")";
+      return false;
+    }
+
+    channels_ = val;
+  }
+  return true;
+}
+
+bool WebMAudioClient::OnFloat(int id, double val) {
+  double* dst = NULL;
+
+  switch (id) {
+    case kWebMIdSamplingFrequency:
+      dst = &samples_per_second_;
+      break;
+    case kWebMIdOutputSamplingFrequency:
+      dst = &output_samples_per_second_;
+      break;
+    default:
+      return true;
+  }
+
+  if (val <= 0)
+    return false;
+
+  if (*dst != -1) {
+    MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
+                       << " specified (" << *dst << " and " << val << ")";
+    return false;
+  }
+
+  *dst = val;
+  return true;
+}
+
+}  // namespace media