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