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diff --git a/ppapi/api/dev/ppb_audio_input_dev.idl b/ppapi/api/dev/ppb_audio_input_dev.idl
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+++ b/ppapi/api/dev/ppb_audio_input_dev.idl
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+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPB_AudioInput_Dev</code> interface, which
+ * provides realtime audio input capture.
+ */
+
+label Chrome {
+  M17 = 0.1
+};
+
+/**
+ * <code>PPB_AudioInput_Callback</code> defines the type of an audio callback
+ * function used to provide the audio buffer with data. This callback will be
+ * called on a separate thread to the creation thread.
+ */
+typedef void PPB_AudioInput_Callback([out] mem_t sample_buffer,
+                                     [in] uint32_t buffer_size_in_bytes,
+                                     [inout] mem_t user_data);
+
+/**
+ * The <code>PPB_AudioInput_Dev</code> interface contains pointers to several
+ * functions for handling audio input resources.
+ */
+[version=0.1, macro="PPB_AUDIO_INPUT_DEV_INTERFACE"]
+interface PPB_AudioInput_Dev {
+  /**
+   * Create is a pointer to a function that creates an audio input resource.
+   * No sound will be captured until StartCapture() is called.
+   */
+  PP_Resource Create(
+      [in] PP_Instance instance,
+      [in] PP_Resource config,
+      [in] PPB_AudioInput_Callback audio_input_callback,
+      [inout] mem_t user_data);
+
+  /**
+   * IsAudioInput is a pointer to a function that determines if the given
+   * resource is an audio input resource.
+   *
+   * @param[in] resource A PP_Resource containing a resource.
+   *
+   * @return A PP_BOOL containing containing PP_TRUE if the given resource is
+   * an audio input resource, otherwise PP_FALSE.
+   */
+  PP_Bool IsAudioInput(
+      [in] PP_Resource audio_input);
+
+  /**
+   * GetCurrrentConfig() returns an audio config resource for the given audio
+   * resource.
+   *
+   * @param[in] config A <code>PP_Resource</code> corresponding to an audio
+   * resource.
+   *
+   * @return A <code>PP_Resource</code> containing the audio config resource if
+   * successful.
+   */
+  PP_Resource GetCurrentConfig(
+      [in] PP_Resource audio_input);
+
+  /**
+   * StartCapture() starts the capture of the audio input resource and begins
+   * periodically calling the callback.
+   *
+   * @param[in] config A <code>PP_Resource</code> corresponding to an audio
+   * input resource.
+   *
+   * @return A <code>PP_Bool</code> containing <code>PP_TRUE</code> if
+   * successful, otherwise <code>PP_FALSE</code>. Also returns
+   * <code>PP_TRUE</code> (and be a no-op) if called while callback is already
+   * in progress.
+   */
+  PP_Bool StartCapture(
+      [in] PP_Resource audio_input);
+
+  /**
+   * StopCapture is a pointer to a function that stops the capture of
+   * the audio input resource.
+   *
+   * @param[in] config A PP_Resource containing the audio input resource.
+   *
+   * @return A PP_BOOL containing PP_TRUE if successful, otherwise PP_FALSE.
+   * Also returns PP_TRUE (and is a no-op) if called while capture is already
+   * stopped. If a buffer is being captured, StopCapture will block until the
+   * call completes.
+   */
+  PP_Bool StopCapture(
+      [in] PP_Resource audio_input);
+};
+