ppapi/c/ppb_video_decoder.h

   1 /* Copyright (c) 2014 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 /* From ppb_video_decoder.idl modified Fri Jul 11 18:06:37 2014. */
   7
   8 #ifndef PPAPI_C_PPB_VIDEO_DECODER_H_
   9 #define PPAPI_C_PPB_VIDEO_DECODER_H_
  10
  11 #include "ppapi/c/pp_bool.h"
  12 #include "ppapi/c/pp_codecs.h"
  13 #include "ppapi/c/pp_completion_callback.h"
  14 #include "ppapi/c/pp_instance.h"
  15 #include "ppapi/c/pp_macros.h"
  16 #include "ppapi/c/pp_resource.h"
  17 #include "ppapi/c/pp_size.h"
  18 #include "ppapi/c/pp_stdint.h"
  19
  20 #define PPB_VIDEODECODER_INTERFACE_0_1 "PPB_VideoDecoder;0.1" /* dev */
  21 /**
  22  * @file
  23  * This file defines the <code>PPB_VideoDecoder</code> interface.
  24  */
  25
  26
  27 /**
  28  * @addtogroup Interfaces
  29  * @{
  30  */
  31 /**
  32  * Video decoder interface.
  33  *
  34  * Typical usage:
  35  * - Call Create() to create a new video decoder resource.
  36  * - Call Initialize() to initialize it with a 3d graphics context and the
  37  *   desired codec profile.
  38  * - Call Decode() continuously (waiting for each previous call to complete) to
  39  *   push bitstream buffers to the decoder.
  40  * - Call GetPicture() continuously (waiting for each previous call to complete)
  41  *   to pull decoded pictures from the decoder.
  42  * - Call Flush() to signal end of stream to the decoder and perform shutdown
  43  *   when it completes.
  44  * - Call Reset() to quickly stop the decoder (e.g. to implement Seek) and wait
  45  *   for the callback before restarting decoding at another point.
  46  * - To destroy the decoder, the plugin should release all of its references to
  47  *   it. Any pending callbacks will abort before the decoder is destroyed.
  48  *
  49  * Available video codecs vary by platform.
  50  * All: theora, vorbis, vp8.
  51  * Chrome and ChromeOS: aac, h264.
  52  * ChromeOS: mpeg4.
  53  */
  54 struct PPB_VideoDecoder_0_1 { /* dev */
  55   /**
  56    * Creates a new video decoder resource.
  57    *
  58    * @param[in] instance A <code>PP_Instance</code> identifying the instance
  59    * with the video decoder.
  60    *
  61    * @return A <code>PP_Resource</code> corresponding to a video decoder if
  62    * successful or 0 otherwise.
  63    */
  64   PP_Resource (*Create)(PP_Instance instance);
  65   /**
  66    * Determines if the given resource is a video decoder.
  67    *
  68    * @param[in] resource A <code>PP_Resource</code> identifying a resource.
  69    *
  70    * @return <code>PP_TRUE</code> if the resource is a
  71    * <code>PPB_VideoDecoder</code>, <code>PP_FALSE</code> if the resource is
  72    * invalid or some other type.
  73    */
  74   PP_Bool (*IsVideoDecoder)(PP_Resource resource);
  75   /**
  76    * Initializes a video decoder resource. This should be called after Create()
  77    * and before any other functions.
  78    *
  79    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
  80    * decoder.
  81    * @param[in] graphics3d_context A <code>PPB_Graphics3D</code> resource to use
  82    * during decoding.
  83    * @param[in] profile A <code>PP_VideoProfile</code> specifying the video
  84    * codec profile.
  85    * @param[in] allow_software_fallback A <code>PP_Bool</code> specifying
  86    * whether the decoder can fall back to software decoding if a suitable
  87    * hardware decoder isn't available.
  88    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
  89    * completion.
  90    *
  91    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
  92    * Returns PP_ERROR_NOTSUPPORTED if video decoding is not available, or the
  93    * requested profile is not supported. In this case, the client may call
  94    * Initialize() again with different parameters to find a good configuration.
  95    */
  96   int32_t (*Initialize)(PP_Resource video_decoder,
  97                         PP_Resource graphics3d_context,
  98                         PP_VideoProfile profile,
  99                         PP_Bool allow_software_fallback,
 100                         struct PP_CompletionCallback callback);
 101   /**
 102    * Decodes a bitstream buffer. Copies |size| bytes of data from the plugin's
 103    * |buffer|. The plugin should wait until the decoder signals completion by
 104    * returning PP_OK or by running |callback| before calling Decode() again.
 105    *
 106    * In general, each bitstream buffer should contain a demuxed bitstream frame
 107    * for the selected video codec. For example, H264 decoders expect to receive
 108    * one AnnexB NAL unit, including the 4 byte start code prefix, while VP8
 109    * decoders expect to receive a bitstream frame without the IVF frame header.
 110    *
 111    * If the call to Decode() eventually results in a picture, the |decode_id|
 112    * parameter is copied into the returned picture. The plugin can use this to
 113    * associate decoded pictures with Decode() calls (e.g. to assign timestamps
 114    * or frame numbers to pictures.) This value is opaque to the API so the
 115    * plugin is free to pass any value.
 116    *
 117    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 118    * decoder.
 119    * @param[in] decode_id An optional value, chosen by the plugin, that can be
 120    * used to associate calls to Decode() with decoded pictures returned by
 121    * GetPicture().
 122    * @param[in] size Buffer size in bytes.
 123    * @param[in] buffer Starting address of buffer.
 124    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 125    * completion.
 126    *
 127    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 128    * Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Flush()
 129    * or Reset() call is pending.
 130    * Returns PP_ERROR_INPROGRESS if there is another Decode() call pending.
 131    * Returns PP_ERROR_NOMEMORY if a bitstream buffer can't be created.
 132    * Returns PP_ERROR_ABORTED when Reset() is called while Decode() is pending.
 133    */
 134   int32_t (*Decode)(PP_Resource video_decoder,
 135                     uint32_t decode_id,
 136                     uint32_t size,
 137                     const void* buffer,
 138                     struct PP_CompletionCallback callback);
 139   /**
 140    * Gets the next picture from the decoder. The picture is valid after the
 141    * decoder signals completion by returning PP_OK or running |callback|. The
 142    * plugin can call GetPicture() again after the decoder signals completion.
 143    * When the plugin is finished using the picture, it should return it to the
 144    * system by calling RecyclePicture().
 145    *
 146    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 147    * decoder.
 148    * @param[out] picture A <code>PP_VideoPicture</code> to hold the decoded
 149    * picture.
 150    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 151    * completion.
 152    *
 153    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 154    * Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Reset()
 155    * call is pending.
 156    * Returns PP_ERROR_INPROGRESS if there is another GetPicture() call pending.
 157    * Returns PP_ERROR_ABORTED when Reset() is called, or if a call to Flush()
 158    * completes while GetPicture() is pending.
 159    */
 160   int32_t (*GetPicture)(PP_Resource video_decoder,
 161                         struct PP_VideoPicture* picture,
 162                         struct PP_CompletionCallback callback);
 163   /**
 164    * Recycles a picture that the plugin has received from the decoder.
 165    * The plugin should call this as soon as it has finished using the texture so
 166    * the decoder can decode more pictures.
 167    *
 168    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 169    * decoder.
 170    * @param[in] picture A <code>PP_VideoPicture</code> to return to
 171    * the decoder.
 172    */
 173   void (*RecyclePicture)(PP_Resource video_decoder,
 174                          const struct PP_VideoPicture* picture);
 175   /**
 176    * Flushes the decoder. The plugin should call Flush() when it reaches the
 177    * end of its video stream in order to stop cleanly. The decoder will run any
 178    * pending Decode() call to completion. The plugin should make no further
 179    * calls to the decoder other than GetPicture() and RecyclePicture() until
 180    * the decoder signals completion by running |callback|. Just before
 181    * completion, any pending GetPicture() call will complete by running its
 182    * callback with result PP_ERROR_ABORTED to signal that no more pictures are
 183    * available. Any pictures held by the plugin remain valid during and after
 184    * the flush and should be recycled back to the decoder.
 185    *
 186    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 187    * decoder.
 188    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 189    * completion.
 190    *
 191    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 192    * Returns PP_ERROR_FAILED if the decoder isn't initialized.
 193    */
 194   int32_t (*Flush)(PP_Resource video_decoder,
 195                    struct PP_CompletionCallback callback);
 196   /**
 197    * Resets the decoder as quickly as possible. The plugin can call Reset() to
 198    * skip to another position in the video stream. After Reset() returns, any
 199    * pending calls to Decode() and GetPicture()) abort, causing their callbacks
 200    * to run with PP_ERROR_ABORTED. The plugin should not make further calls to
 201    * the decoder other than RecyclePicture() until the decoder signals
 202    * completion by running |callback|. Any pictures held by the plugin remain
 203    * valid during and after the reset and should be recycled back to the
 204    * decoder.
 205    *
 206    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 207    * decoder.
 208    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 209    * completion.
 210    *
 211    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 212    * Returns PP_ERROR_FAILED if the decoder isn't initialized.
 213    */
 214   int32_t (*Reset)(PP_Resource video_decoder,
 215                    struct PP_CompletionCallback callback);
 216 };
 217 /**
 218  * @}
 219  */
 220
 221 #endif  /* PPAPI_C_PPB_VIDEO_DECODER_H_ */
 222