1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef VPX_VPX_DECODER_H_ 11 #define VPX_VPX_DECODER_H_ 12 13 /*!\defgroup decoder Decoder Algorithm Interface 14 * \ingroup codec 15 * This abstraction allows applications using this decoder to easily support 16 * multiple video formats with minimal code duplication. This section describes 17 * the interface common to all decoders. 18 * @{ 19 */ 20 21 /*!\file 22 * \brief Describes the decoder algorithm interface to applications. 23 * 24 * This file describes the interface between an application and a 25 * video decoder algorithm. 26 * 27 */ 28 #ifdef __cplusplus 29 extern "C" { 30 #endif 31 32 #include "./vpx_codec.h" 33 #include "./vpx_frame_buffer.h" 34 35 /*!\brief Current ABI version number 36 * 37 * \internal 38 * If this file is altered in any way that changes the ABI, this value 39 * must be bumped. Examples include, but are not limited to, changing 40 * types, removing or reassigning enums, adding/removing/rearranging 41 * fields to structures 42 */ 43 #define VPX_DECODER_ABI_VERSION (3 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/ 44 45 /*! \brief Decoder capabilities bitfield 46 * 47 * Each decoder advertises the capabilities it supports as part of its 48 * ::vpx_codec_iface_t interface structure. Capabilities are extra interfaces 49 * or functionality, and are not required to be supported by a decoder. 50 * 51 * The available flags are specified by VPX_CODEC_CAP_* defines. 52 */ 53 #define VPX_CODEC_CAP_PUT_SLICE 0x10000 /**< Will issue put_slice callbacks */ 54 #define VPX_CODEC_CAP_PUT_FRAME 0x20000 /**< Will issue put_frame callbacks */ 55 #define VPX_CODEC_CAP_POSTPROC 0x40000 /**< Can postprocess decoded frame */ 56 #define VPX_CODEC_CAP_ERROR_CONCEALMENT 0x80000 /**< Can conceal errors due to 57 packet loss */ 58 #define VPX_CODEC_CAP_INPUT_FRAGMENTS 0x100000 /**< Can receive encoded frames 59 one fragment at a time */ 60 61 /*! \brief Initialization-time Feature Enabling 62 * 63 * Certain codec features must be known at initialization time, to allow for 64 * proper memory allocation. 65 * 66 * The available flags are specified by VPX_CODEC_USE_* defines. 67 */ 68 #define VPX_CODEC_CAP_FRAME_THREADING 0x200000 /**< Can support frame-based 69 multi-threading */ 70 #define VPX_CODEC_CAP_EXTERNAL_FRAME_BUFFER 0x400000 /**< Can support external 71 frame buffers */ 72 73 #define VPX_CODEC_USE_POSTPROC 0x10000 /**< Postprocess decoded frame */ 74 #define VPX_CODEC_USE_ERROR_CONCEALMENT 0x20000 /**< Conceal errors in decoded 75 frames */ 76 #define VPX_CODEC_USE_INPUT_FRAGMENTS 0x40000 /**< The input frame should be 77 passed to the decoder one 78 fragment at a time */ 79 #define VPX_CODEC_USE_FRAME_THREADING 0x80000 /**< Enable frame-based 80 multi-threading */ 81 82 /*!\brief Stream properties 83 * 84 * This structure is used to query or set properties of the decoded 85 * stream. Algorithms may extend this structure with data specific 86 * to their bitstream by setting the sz member appropriately. 87 */ 88 typedef struct vpx_codec_stream_info { 89 unsigned int sz; /**< Size of this structure */ 90 unsigned int w; /**< Width (or 0 for unknown/default) */ 91 unsigned int h; /**< Height (or 0 for unknown/default) */ 92 unsigned int is_kf; /**< Current frame is a keyframe */ 93 } vpx_codec_stream_info_t; 94 95 /* REQUIRED FUNCTIONS 96 * 97 * The following functions are required to be implemented for all decoders. 98 * They represent the base case functionality expected of all decoders. 99 */ 100 101 102 /*!\brief Initialization Configurations 103 * 104 * This structure is used to pass init time configuration options to the 105 * decoder. 106 */ 107 typedef struct vpx_codec_dec_cfg { 108 unsigned int threads; /**< Maximum number of threads to use, default 1 */ 109 unsigned int w; /**< Width */ 110 unsigned int h; /**< Height */ 111 } vpx_codec_dec_cfg_t; /**< alias for struct vpx_codec_dec_cfg */ 112 113 114 /*!\brief Initialize a decoder instance 115 * 116 * Initializes a decoder context using the given interface. Applications 117 * should call the vpx_codec_dec_init convenience macro instead of this 118 * function directly, to ensure that the ABI version number parameter 119 * is properly initialized. 120 * 121 * If the library was configured with --disable-multithread, this call 122 * is not thread safe and should be guarded with a lock if being used 123 * in a multithreaded context. 124 * 125 * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags 126 * parameter), the storage pointed to by the cfg parameter must be 127 * kept readable and stable until all memory maps have been set. 128 * 129 * \param[in] ctx Pointer to this instance's context. 130 * \param[in] iface Pointer to the algorithm interface to use. 131 * \param[in] cfg Configuration to use, if known. May be NULL. 132 * \param[in] flags Bitfield of VPX_CODEC_USE_* flags 133 * \param[in] ver ABI version number. Must be set to 134 * VPX_DECODER_ABI_VERSION 135 * \retval #VPX_CODEC_OK 136 * The decoder algorithm initialized. 137 * \retval #VPX_CODEC_MEM_ERROR 138 * Memory allocation failed. 139 */ 140 vpx_codec_err_t vpx_codec_dec_init_ver(vpx_codec_ctx_t *ctx, 141 vpx_codec_iface_t *iface, 142 vpx_codec_dec_cfg_t *cfg, 143 vpx_codec_flags_t flags, 144 int ver); 145 146 /*!\brief Convenience macro for vpx_codec_dec_init_ver() 147 * 148 * Ensures the ABI version parameter is properly set. 149 */ 150 #define vpx_codec_dec_init(ctx, iface, cfg, flags) \ 151 vpx_codec_dec_init_ver(ctx, iface, cfg, flags, VPX_DECODER_ABI_VERSION) 152 153 154 /*!\brief Parse stream info from a buffer 155 * 156 * Performs high level parsing of the bitstream. Construction of a decoder 157 * context is not necessary. Can be used to determine if the bitstream is 158 * of the proper format, and to extract information from the stream. 159 * 160 * \param[in] iface Pointer to the algorithm interface 161 * \param[in] data Pointer to a block of data to parse 162 * \param[in] data_sz Size of the data buffer 163 * \param[in,out] si Pointer to stream info to update. The size member 164 * \ref MUST be properly initialized, but \ref MAY be 165 * clobbered by the algorithm. This parameter \ref MAY 166 * be NULL. 167 * 168 * \retval #VPX_CODEC_OK 169 * Bitstream is parsable and stream information updated 170 */ 171 vpx_codec_err_t vpx_codec_peek_stream_info(vpx_codec_iface_t *iface, 172 const uint8_t *data, 173 unsigned int data_sz, 174 vpx_codec_stream_info_t *si); 175 176 177 /*!\brief Return information about the current stream. 178 * 179 * Returns information about the stream that has been parsed during decoding. 180 * 181 * \param[in] ctx Pointer to this instance's context 182 * \param[in,out] si Pointer to stream info to update. The size member 183 * \ref MUST be properly initialized, but \ref MAY be 184 * clobbered by the algorithm. This parameter \ref MAY 185 * be NULL. 186 * 187 * \retval #VPX_CODEC_OK 188 * Bitstream is parsable and stream information updated 189 */ 190 vpx_codec_err_t vpx_codec_get_stream_info(vpx_codec_ctx_t *ctx, 191 vpx_codec_stream_info_t *si); 192 193 194 /*!\brief Decode data 195 * 196 * Processes a buffer of coded data. If the processing results in a new 197 * decoded frame becoming available, PUT_SLICE and PUT_FRAME events may be 198 * generated, as appropriate. Encoded data \ref MUST be passed in DTS (decode 199 * time stamp) order. Frames produced will always be in PTS (presentation 200 * time stamp) order. 201 * If the decoder is configured with VPX_CODEC_USE_INPUT_FRAGMENTS enabled, 202 * data and data_sz can contain a fragment of the encoded frame. Fragment 203 * \#n must contain at least partition \#n, but can also contain subsequent 204 * partitions (\#n+1 - \#n+i), and if so, fragments \#n+1, .., \#n+i must 205 * be empty. When no more data is available, this function should be called 206 * with NULL as data and 0 as data_sz. The memory passed to this function 207 * must be available until the frame has been decoded. 208 * 209 * \param[in] ctx Pointer to this instance's context 210 * \param[in] data Pointer to this block of new coded data. If 211 * NULL, a VPX_CODEC_CB_PUT_FRAME event is posted 212 * for the previously decoded frame. 213 * \param[in] data_sz Size of the coded data, in bytes. 214 * \param[in] user_priv Application specific data to associate with 215 * this frame. 216 * \param[in] deadline Soft deadline the decoder should attempt to meet, 217 * in us. Set to zero for unlimited. 218 * 219 * \return Returns #VPX_CODEC_OK if the coded data was processed completely 220 * and future pictures can be decoded without error. Otherwise, 221 * see the descriptions of the other error codes in ::vpx_codec_err_t 222 * for recoverability capabilities. 223 */ 224 vpx_codec_err_t vpx_codec_decode(vpx_codec_ctx_t *ctx, 225 const uint8_t *data, 226 unsigned int data_sz, 227 void *user_priv, 228 long deadline); 229 230 231 /*!\brief Decoded frames iterator 232 * 233 * Iterates over a list of the frames available for display. The iterator 234 * storage should be initialized to NULL to start the iteration. Iteration is 235 * complete when this function returns NULL. 236 * 237 * The list of available frames becomes valid upon completion of the 238 * vpx_codec_decode call, and remains valid until the next call to vpx_codec_decode. 239 * 240 * \param[in] ctx Pointer to this instance's context 241 * \param[in,out] iter Iterator storage, initialized to NULL 242 * 243 * \return Returns a pointer to an image, if one is ready for display. Frames 244 * produced will always be in PTS (presentation time stamp) order. 245 */ 246 vpx_image_t *vpx_codec_get_frame(vpx_codec_ctx_t *ctx, 247 vpx_codec_iter_t *iter); 248 249 250 /*!\defgroup cap_put_frame Frame-Based Decoding Functions 251 * 252 * The following functions are required to be implemented for all decoders 253 * that advertise the VPX_CODEC_CAP_PUT_FRAME capability. Calling these functions 254 * for codecs that don't advertise this capability will result in an error 255 * code being returned, usually VPX_CODEC_ERROR 256 * @{ 257 */ 258 259 /*!\brief put frame callback prototype 260 * 261 * This callback is invoked by the decoder to notify the application of 262 * the availability of decoded image data. 263 */ 264 typedef void (*vpx_codec_put_frame_cb_fn_t)(void *user_priv, 265 const vpx_image_t *img); 266 267 268 /*!\brief Register for notification of frame completion. 269 * 270 * Registers a given function to be called when a decoded frame is 271 * available. 272 * 273 * \param[in] ctx Pointer to this instance's context 274 * \param[in] cb Pointer to the callback function 275 * \param[in] user_priv User's private data 276 * 277 * \retval #VPX_CODEC_OK 278 * Callback successfully registered. 279 * \retval #VPX_CODEC_ERROR 280 * Decoder context not initialized, or algorithm not capable of 281 * posting slice completion. 282 */ 283 vpx_codec_err_t vpx_codec_register_put_frame_cb(vpx_codec_ctx_t *ctx, 284 vpx_codec_put_frame_cb_fn_t cb, 285 void *user_priv); 286 287 288 /*!@} - end defgroup cap_put_frame */ 289 290 /*!\defgroup cap_put_slice Slice-Based Decoding Functions 291 * 292 * The following functions are required to be implemented for all decoders 293 * that advertise the VPX_CODEC_CAP_PUT_SLICE capability. Calling these functions 294 * for codecs that don't advertise this capability will result in an error 295 * code being returned, usually VPX_CODEC_ERROR 296 * @{ 297 */ 298 299 /*!\brief put slice callback prototype 300 * 301 * This callback is invoked by the decoder to notify the application of 302 * the availability of partially decoded image data. The 303 */ 304 typedef void (*vpx_codec_put_slice_cb_fn_t)(void *user_priv, 305 const vpx_image_t *img, 306 const vpx_image_rect_t *valid, 307 const vpx_image_rect_t *update); 308 309 310 /*!\brief Register for notification of slice completion. 311 * 312 * Registers a given function to be called when a decoded slice is 313 * available. 314 * 315 * \param[in] ctx Pointer to this instance's context 316 * \param[in] cb Pointer to the callback function 317 * \param[in] user_priv User's private data 318 * 319 * \retval #VPX_CODEC_OK 320 * Callback successfully registered. 321 * \retval #VPX_CODEC_ERROR 322 * Decoder context not initialized, or algorithm not capable of 323 * posting slice completion. 324 */ 325 vpx_codec_err_t vpx_codec_register_put_slice_cb(vpx_codec_ctx_t *ctx, 326 vpx_codec_put_slice_cb_fn_t cb, 327 void *user_priv); 328 329 330 /*!@} - end defgroup cap_put_slice*/ 331 332 /*!\defgroup cap_external_frame_buffer External Frame Buffer Functions 333 * 334 * The following section is required to be implemented for all decoders 335 * that advertise the VPX_CODEC_CAP_EXTERNAL_FRAME_BUFFER capability. 336 * Calling this function for codecs that don't advertise this capability 337 * will result in an error code being returned, usually VPX_CODEC_ERROR. 338 * 339 * \note 340 * Currently this only works with VP9. 341 * @{ 342 */ 343 344 /*!\brief Pass in external frame buffers for the decoder to use. 345 * 346 * Registers functions to be called when libvpx needs a frame buffer 347 * to decode the current frame and a function to be called when libvpx does 348 * not internally reference the frame buffer. This set function must 349 * be called before the first call to decode or libvpx will assume the 350 * default behavior of allocating frame buffers internally. 351 * 352 * \param[in] ctx Pointer to this instance's context 353 * \param[in] cb_get Pointer to the get callback function 354 * \param[in] cb_release Pointer to the release callback function 355 * \param[in] cb_priv Callback's private data 356 * 357 * \retval #VPX_CODEC_OK 358 * External frame buffers will be used by libvpx. 359 * \retval #VPX_CODEC_INVALID_PARAM 360 * One or more of the callbacks were NULL. 361 * \retval #VPX_CODEC_ERROR 362 * Decoder context not initialized, or algorithm not capable of 363 * using external frame buffers. 364 * 365 * \note 366 * When decoding VP9, the application may be required to pass in at least 367 * #VP9_MAXIMUM_REF_BUFFERS + #VPX_MAXIMUM_WORK_BUFFERS external frame 368 * buffers. 369 */ 370 vpx_codec_err_t vpx_codec_set_frame_buffer_functions( 371 vpx_codec_ctx_t *ctx, 372 vpx_get_frame_buffer_cb_fn_t cb_get, 373 vpx_release_frame_buffer_cb_fn_t cb_release, void *cb_priv); 374 375 /*!@} - end defgroup cap_external_frame_buffer */ 376 377 /*!@} - end defgroup decoder*/ 378 #ifdef __cplusplus 379 } 380 #endif 381 #endif // VPX_VPX_DECODER_H_ 382 383