Add PP_VideoFrame, PPB_VideoReader, and PPB_VideoWriter APIs to Pepper.

ppapi/api/ppb_video_reader.idl

Index: ppapi/api/ppb_video_reader.idl
diff --git a/ppapi/api/ppb_video_reader.idl b/ppapi/api/ppb_video_reader.idl
new file mode 100644
index 0000000000000000000000000000000000000000..1c9858436aaf2f3a0b81e174faac87ade4c724e4
--- /dev/null
+++ b/ppapi/api/ppb_video_reader.idl
@@ -0,0 +1,89 @@
+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPB_VideoReader</code> struct for a video reader
+ * resource.
+ */
+
+ label Chrome {
+   M28 = 0.1
+ };
+
+/**
+ * The <code>PPB_VideoReader</code> interface contains pointers to several
+ * functions for creating video reader resources and using them to consume
+ * streams of video frames.
+ */
+interface PPB_VideoReader {
+  /**
+   * Creates a video reader resource.
+   *
+   * @param[in] instance A <code>PP_Instance</code> identifying one instance
+   * of a module.
+   *
+   * @return A <code>PP_Resource</code> with a nonzero ID on success or zero on
+   * failure. Failure means the instance was invalid.
+   */
+  PP_Resource Create([in] PP_Instance instance);
+
+  /**
+   * Determines if a given resource is a video reader.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a resource.
+   *
+   * @return A <code>PP_Bool</code> with <code>PP_TRUE</code> if the given
+   * resource is a video reader or <code>PP_FALSE</code> otherwise.
+   */
+  PP_Bool IsVideoReader([in] PP_Resource resource);
+
+  /**
+   * Opens a video stream with the given id for reading.
+   *
+   * @param[in] reader A <code>PP_Resource</code> corresponding to a video
+   * reader resource.
+   * @param[in] stream_id A <code>PP_Var</code> holding a string uniquely
+   * identifying the stream. This string is application defined.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of Open().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   * Returns PP_ERROR_BADRESOURCE if reader isn't a valid video reader.
+   * Returns PP_ERROR_INPROGRESS if the reader has already opened a stream.
+   */
+  int32_t Open([in] PP_Resource reader,
+               [in] PP_Var stream_id,

[juberti, 2013/04/05 18:46:12]

In the latest proposal I changed this to be an [out] param, e.g. browser
generates the id for a new track.

[bbudge, 2013/04/05 20:50:24]

I'll change it in a follow on patch.
On 2013/04/05 18:46:12, juberti wrote:

+               [in] PP_CompletionCallback callback);
+
+  /**
+   * Gets the next frame of video from the reader's open stream. The image data
+   * resource returned in the frame will have its reference count incremented by
+   * one and must be managed by the plugin.
+   *
+   * @param[in] reader A <code>PP_Resource</code> corresponding to a video
+   * reader resource.
+   * @param[out] frame A <code>PP_VideoFrame</code> to hold a video frame to
+   * read from the open stream.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of GetNextFrame().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   * Returns PP_ERROR_BADRESOURCE if reader isn't a valid video reader.
+   * Returns PP_ERROR_FAILED if the reader has not opened a stream, if the video
+   * frame has an invalid image data resource, or if some other error occurs.
+   */
+  int32_t GetFrame([in] PP_Resource reader,
+                   [out] PP_VideoFrame frame,
+                   [in] PP_CompletionCallback callback);
+
+  /**
+   * Closes the reader's video stream.
+   *
+   * @param[in] reader A <code>PP_Resource</code> corresponding to a video
+   * reader resource.
+   */
+  void Close([in] PP_Resource reader);
+};
+