ppapi/api/private/ppb_video_destination_private.idl

   1 /* Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file.
   4  */
   5
   6 /**
   7  * This file defines the <code>PPB_VideoDestination_Private</code> interface
   8  * for a video destination resource, which sends video frames to a MediaStream
   9  * video track in the browser.
  10  */
  11
  12  label Chrome {
  13    M28 = 0.1
  14  };
  15
  16 /**
  17  * The <code>PPB_VideoDestination_Private</code> interface contains pointers to
  18  * several functions for creating video destination resources and using them to
  19  * send video frames to a MediaStream video track in the browser.
  20  */
  21 interface PPB_VideoDestination_Private {
  22   /**
  23    * Creates a video destination resource.
  24    *
  25    * @param[in] instance A <code>PP_Instance</code> identifying an instance of
  26    * a module.
  27    *
  28    * @return A <code>PP_Resource</code> with a nonzero ID on success or zero on
  29    * failure. Failure means the instance was invalid.
  30    */
  31   PP_Resource Create([in] PP_Instance instance);
  32
  33   /**
  34    * Determines if a resource is a video destination resource.
  35    *
  36    * @param[in] resource The <code>PP_Resource</code> to test.
  37    *
  38    * @return A <code>PP_Bool</code> with <code>PP_TRUE</code> if the given
  39    * resource is a video destination resource or <code>PP_FALSE</code>
  40    * otherwise.
  41    */
  42   PP_Bool IsVideoDestination([in] PP_Resource resource);
  43
  44   /**
  45    * Opens a video destination for putting frames.
  46    *
  47    * @param[in] destination A <code>PP_Resource</code> corresponding to a video
  48    * destination resource.
  49    * @param[in] stream_url A <code>PP_Var</code> string holding a URL
  50    * identifying a MediaStream.
  51    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
  52    * completion of Open().
  53    *
  54    * @return An int32_t containing a result code from <code>pp_errors.h</code>.
  55    * Returns PP_ERROR_BADRESOURCE if destination isn't a valid video
  56    * destination.
  57    * Returns PP_ERROR_INPROGRESS if destination is already open.
  58    * Returns PP_ERROR_FAILED if the MediaStream doesn't exist or if there is
  59    * some other browser error.
  60    */
  61   int32_t Open([in] PP_Resource destination,
  62                [in] PP_Var stream_url,
  63                [in] PP_CompletionCallback callback);
  64
  65   /**
  66    * Puts a frame to the video destination.
  67    *
  68    * After this call, you should take care to release your references to the
  69    * image embedded in the video frame. If you paint to the image after
  70    * PutFame(), there is the possibility of artifacts because the browser may
  71    * still be copying the frame to the stream.
  72    *
  73    * @param[in] destination A <code>PP_Resource</code> corresponding to a video
  74    * destination resource.
  75    * @param[in] frame A <code>PP_VideoFrame_Private</code> holding the video
  76    * frame to send to the destination.
  77    *
  78    * @return An int32_t containing a result code from <code>pp_errors.h</code>.
  79    * Returns PP_ERROR_BADRESOURCE if destination isn't a valid video
  80    * destination.
  81    * Returns PP_ERROR_FAILED if destination is not open, if the video frame has
  82    * an invalid image data resource, or if some other browser error occurs.
  83    */
  84   int32_t PutFrame([in] PP_Resource destination,
  85                    [in] PP_VideoFrame_Private frame);
  86
  87   /**
  88    * Closes the video destination.
  89    *
  90    * @param[in] destination A <code>PP_Resource</code> corresponding to a video
  91    * destination.
  92    */
  93   void Close([in] PP_Resource destination);
  94 };
  95