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 Wed Nov  5 14:04:14 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_point.h"
  17 #include "ppapi/c/pp_rect.h"
  18 #include "ppapi/c/pp_resource.h"
  19 #include "ppapi/c/pp_size.h"
  20 #include "ppapi/c/pp_stdint.h"
  21
  22 #define PPB_VIDEODECODER_INTERFACE_0_1 "PPB_VideoDecoder;0.1"
  23 #define PPB_VIDEODECODER_INTERFACE_0_2 "PPB_VideoDecoder;0.2"
  24 #define PPB_VIDEODECODER_INTERFACE_1_0 "PPB_VideoDecoder;1.0"
  25 #define PPB_VIDEODECODER_INTERFACE PPB_VIDEODECODER_INTERFACE_1_0
  26
  27 /**
  28  * @file
  29  * This file defines the <code>PPB_VideoDecoder</code> interface.
  30  */
  31
  32
  33 /**
  34  * @addtogroup Interfaces
  35  * @{
  36  */
  37 /**
  38  * Video decoder interface.
  39  *
  40  * Typical usage:
  41  * - Call Create() to create a new video decoder resource.
  42  * - Call Initialize() to initialize it with a 3d graphics context and the
  43  *   desired codec profile.
  44  * - Call Decode() continuously (waiting for each previous call to complete) to
  45  *   push bitstream buffers to the decoder.
  46  * - Call GetPicture() continuously (waiting for each previous call to complete)
  47  *   to pull decoded pictures from the decoder.
  48  * - Call Flush() to signal end of stream to the decoder and perform shutdown
  49  *   when it completes.
  50  * - Call Reset() to quickly stop the decoder (e.g. to implement Seek) and wait
  51  *   for the callback before restarting decoding at another point.
  52  * - To destroy the decoder, the plugin should release all of its references to
  53  *   it. Any pending callbacks will abort before the decoder is destroyed.
  54  *
  55  * Available video codecs vary by platform.
  56  * All: theora, vorbis, vp8.
  57  * Chrome and ChromeOS: aac, h264.
  58  * ChromeOS: mpeg4.
  59  */
  60 struct PPB_VideoDecoder_1_0 {
  61   /**
  62    * Creates a new video decoder resource.
  63    *
  64    * @param[in] instance A <code>PP_Instance</code> identifying the instance
  65    * with the video decoder.
  66    *
  67    * @return A <code>PP_Resource</code> corresponding to a video decoder if
  68    * successful or 0 otherwise.
  69    */
  70   PP_Resource (*Create)(PP_Instance instance);
  71   /**
  72    * Determines if the given resource is a video decoder.
  73    *
  74    * @param[in] resource A <code>PP_Resource</code> identifying a resource.
  75    *
  76    * @return <code>PP_TRUE</code> if the resource is a
  77    * <code>PPB_VideoDecoder</code>, <code>PP_FALSE</code> if the resource is
  78    * invalid or some other type.
  79    */
  80   PP_Bool (*IsVideoDecoder)(PP_Resource resource);
  81   /**
  82    * Initializes a video decoder resource. This should be called after Create()
  83    * and before any other functions.
  84    *
  85    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
  86    * decoder.
  87    * @param[in] graphics3d_context A <code>PPB_Graphics3D</code> resource to use
  88    * during decoding.
  89    * @param[in] profile A <code>PP_VideoProfile</code> specifying the video
  90    * codec profile.
  91    * @param[in] acceleration A <code>PP_HardwareAcceleration</code> specifying
  92    * whether to use a hardware accelerated or a software implementation.
  93    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
  94    * completion.
  95    *
  96    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
  97    * Returns PP_ERROR_NOTSUPPORTED if video decoding is not available, or the
  98    * requested profile is not supported. In this case, the client may call
  99    * Initialize() again with different parameters to find a good configuration.
 100    */
 101   int32_t (*Initialize)(PP_Resource video_decoder,
 102                         PP_Resource graphics3d_context,
 103                         PP_VideoProfile profile,
 104                         PP_HardwareAcceleration acceleration,
 105                         struct PP_CompletionCallback callback);
 106   /**
 107    * Decodes a bitstream buffer. Copies |size| bytes of data from the plugin's
 108    * |buffer|. The plugin should wait until the decoder signals completion by
 109    * returning PP_OK or by running |callback| before calling Decode() again.
 110    *
 111    * In general, each bitstream buffer should contain a demuxed bitstream frame
 112    * for the selected video codec. For example, H264 decoders expect to receive
 113    * one AnnexB NAL unit, including the 4 byte start code prefix, while VP8
 114    * decoders expect to receive a bitstream frame without the IVF frame header.
 115    *
 116    * If the call to Decode() eventually results in a picture, the |decode_id|
 117    * parameter is copied into the returned picture. The plugin can use this to
 118    * associate decoded pictures with Decode() calls (e.g. to assign timestamps
 119    * or frame numbers to pictures.) This value is opaque to the API so the
 120    * plugin is free to pass any value.
 121    *
 122    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 123    * decoder.
 124    * @param[in] decode_id An optional value, chosen by the plugin, that can be
 125    * used to associate calls to Decode() with decoded pictures returned by
 126    * GetPicture().
 127    * @param[in] size Buffer size in bytes.
 128    * @param[in] buffer Starting address of buffer.
 129    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 130    * completion.
 131    *
 132    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 133    * Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Flush()
 134    * or Reset() call is pending.
 135    * Returns PP_ERROR_INPROGRESS if there is another Decode() call pending.
 136    * Returns PP_ERROR_NOMEMORY if a bitstream buffer can't be created.
 137    * Returns PP_ERROR_ABORTED when Reset() is called while Decode() is pending.
 138    */
 139   int32_t (*Decode)(PP_Resource video_decoder,
 140                     uint32_t decode_id,
 141                     uint32_t size,
 142                     const void* buffer,
 143                     struct PP_CompletionCallback callback);
 144   /**
 145    * Gets the next picture from the decoder. The picture is valid after the
 146    * decoder signals completion by returning PP_OK or running |callback|. The
 147    * plugin can call GetPicture() again after the decoder signals completion.
 148    * When the plugin is finished using the picture, it should return it to the
 149    * system by calling RecyclePicture().
 150    *
 151    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 152    * decoder.
 153    * @param[out] picture A <code>PP_VideoPicture</code> to hold the decoded
 154    * picture.
 155    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 156    * completion.
 157    *
 158    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 159    * Returns PP_ERROR_FAILED if the decoder isn't initialized or if a Reset()
 160    * call is pending.
 161    * Returns PP_ERROR_INPROGRESS if there is another GetPicture() call pending.
 162    * Returns PP_ERROR_ABORTED when Reset() is called, or if a call to Flush()
 163    * completes while GetPicture() is pending.
 164    */
 165   int32_t (*GetPicture)(PP_Resource video_decoder,
 166                         struct PP_VideoPicture* picture,
 167                         struct PP_CompletionCallback callback);
 168   /**
 169    * Recycles a picture that the plugin has received from the decoder.
 170    * The plugin should call this as soon as it has finished using the texture so
 171    * the decoder can decode more pictures.
 172    *
 173    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 174    * decoder.
 175    * @param[in] picture A <code>PP_VideoPicture</code> to return to
 176    * the decoder.
 177    */
 178   void (*RecyclePicture)(PP_Resource video_decoder,
 179                          const struct PP_VideoPicture* picture);
 180   /**
 181    * Flushes the decoder. The plugin should call Flush() when it reaches the
 182    * end of its video stream in order to stop cleanly. The decoder will run any
 183    * pending Decode() call to completion. The plugin should make no further
 184    * calls to the decoder other than GetPicture() and RecyclePicture() until
 185    * the decoder signals completion by running |callback|. Just before
 186    * completion, any pending GetPicture() call will complete by running its
 187    * callback with result PP_ERROR_ABORTED to signal that no more pictures are
 188    * available. Any pictures held by the plugin remain valid during and after
 189    * the flush and should be recycled back to the decoder.
 190    *
 191    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 192    * decoder.
 193    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 194    * completion.
 195    *
 196    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 197    * Returns PP_ERROR_FAILED if the decoder isn't initialized.
 198    */
 199   int32_t (*Flush)(PP_Resource video_decoder,
 200                    struct PP_CompletionCallback callback);
 201   /**
 202    * Resets the decoder as quickly as possible. The plugin can call Reset() to
 203    * skip to another position in the video stream. After Reset() returns, any
 204    * pending calls to Decode() and GetPicture()) abort, causing their callbacks
 205    * to run with PP_ERROR_ABORTED. The plugin should not make further calls to
 206    * the decoder other than RecyclePicture() until the decoder signals
 207    * completion by running |callback|. Any pictures held by the plugin remain
 208    * valid during and after the reset and should be recycled back to the
 209    * decoder.
 210    *
 211    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
 212    * decoder.
 213    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
 214    * completion.
 215    *
 216    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
 217    * Returns PP_ERROR_FAILED if the decoder isn't initialized.
 218    */
 219   int32_t (*Reset)(PP_Resource video_decoder,
 220                    struct PP_CompletionCallback callback);
 221 };
 222
 223 typedef struct PPB_VideoDecoder_1_0 PPB_VideoDecoder;
 224
 225 struct PPB_VideoDecoder_0_1 {
 226   PP_Resource (*Create)(PP_Instance instance);
 227   PP_Bool (*IsVideoDecoder)(PP_Resource resource);
 228   int32_t (*Initialize)(PP_Resource video_decoder,
 229                         PP_Resource graphics3d_context,
 230                         PP_VideoProfile profile,
 231                         PP_Bool allow_software_fallback,
 232                         struct PP_CompletionCallback callback);
 233   int32_t (*Decode)(PP_Resource video_decoder,
 234                     uint32_t decode_id,
 235                     uint32_t size,
 236                     const void* buffer,
 237                     struct PP_CompletionCallback callback);
 238   int32_t (*GetPicture)(PP_Resource video_decoder,
 239                         struct PP_VideoPicture_0_1* picture,
 240                         struct PP_CompletionCallback callback);
 241   void (*RecyclePicture)(PP_Resource video_decoder,
 242                          const struct PP_VideoPicture* picture);
 243   int32_t (*Flush)(PP_Resource video_decoder,
 244                    struct PP_CompletionCallback callback);
 245   int32_t (*Reset)(PP_Resource video_decoder,
 246                    struct PP_CompletionCallback callback);
 247 };
 248
 249 struct PPB_VideoDecoder_0_2 {
 250   PP_Resource (*Create)(PP_Instance instance);
 251   PP_Bool (*IsVideoDecoder)(PP_Resource resource);
 252   int32_t (*Initialize)(PP_Resource video_decoder,
 253                         PP_Resource graphics3d_context,
 254                         PP_VideoProfile profile,
 255                         PP_HardwareAcceleration acceleration,
 256                         struct PP_CompletionCallback callback);
 257   int32_t (*Decode)(PP_Resource video_decoder,
 258                     uint32_t decode_id,
 259                     uint32_t size,
 260                     const void* buffer,
 261                     struct PP_CompletionCallback callback);
 262   int32_t (*GetPicture)(PP_Resource video_decoder,
 263                         struct PP_VideoPicture_0_1* picture,
 264                         struct PP_CompletionCallback callback);
 265   void (*RecyclePicture)(PP_Resource video_decoder,
 266                          const struct PP_VideoPicture* picture);
 267   int32_t (*Flush)(PP_Resource video_decoder,
 268                    struct PP_CompletionCallback callback);
 269   int32_t (*Reset)(PP_Resource video_decoder,
 270                    struct PP_CompletionCallback callback);
 271 };
 272 /**
 273  * @}
 274  */
 275
 276 #endif  /* PPAPI_C_PPB_VIDEO_DECODER_H_ */
 277