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 11 12 /*!\file 13 * \brief Describes the decoder algorithm interface for algorithm 14 * implementations. 15 * 16 * This file defines the private structures and data types that are only 17 * relevant to implementing an algorithm, as opposed to using it. 18 * 19 * To create a decoder algorithm class, an interface structure is put 20 * into the global namespace: 21 * <pre> 22 * my_codec.c: 23 * vpx_codec_iface_t my_codec = { 24 * "My Codec v1.0", 25 * VPX_CODEC_ALG_ABI_VERSION, 26 * ... 27 * }; 28 * </pre> 29 * 30 * An application instantiates a specific decoder instance by using 31 * vpx_codec_init() and a pointer to the algorithm's interface structure: 32 * <pre> 33 * my_app.c: 34 * extern vpx_codec_iface_t my_codec; 35 * { 36 * vpx_codec_ctx_t algo; 37 * res = vpx_codec_init(&algo, &my_codec); 38 * } 39 * </pre> 40 * 41 * Once initialized, the instance is manged using other functions from 42 * the vpx_codec_* family. 43 */ 44 #ifndef VPX_INTERNAL_VPX_CODEC_INTERNAL_H_ 45 #define VPX_INTERNAL_VPX_CODEC_INTERNAL_H_ 46 #include "../vpx_decoder.h" 47 #include "../vpx_encoder.h" 48 #include <stdarg.h> 49 50 #ifdef __cplusplus 51 extern "C" { 52 #endif 53 54 /*!\brief Current ABI version number 55 * 56 * \internal 57 * If this file is altered in any way that changes the ABI, this value 58 * must be bumped. Examples include, but are not limited to, changing 59 * types, removing or reassigning enums, adding/removing/rearranging 60 * fields to structures 61 */ 62 #define VPX_CODEC_INTERNAL_ABI_VERSION (5) /**<\hideinitializer*/ 63 64 typedef struct vpx_codec_alg_priv vpx_codec_alg_priv_t; 65 typedef struct vpx_codec_priv_enc_mr_cfg vpx_codec_priv_enc_mr_cfg_t; 66 67 /*!\brief init function pointer prototype 68 * 69 * Performs algorithm-specific initialization of the decoder context. This 70 * function is called by the generic vpx_codec_init() wrapper function, so 71 * plugins implementing this interface may trust the input parameters to be 72 * properly initialized. 73 * 74 * \param[in] ctx Pointer to this instance's context 75 * \retval #VPX_CODEC_OK 76 * The input stream was recognized and decoder initialized. 77 * \retval #VPX_CODEC_MEM_ERROR 78 * Memory operation failed. 79 */ 80 typedef vpx_codec_err_t (*vpx_codec_init_fn_t)(vpx_codec_ctx_t *ctx, 81 vpx_codec_priv_enc_mr_cfg_t *data); 82 83 /*!\brief destroy function pointer prototype 84 * 85 * Performs algorithm-specific destruction of the decoder context. This 86 * function is called by the generic vpx_codec_destroy() wrapper function, 87 * so plugins implementing this interface may trust the input parameters 88 * to be properly initialized. 89 * 90 * \param[in] ctx Pointer to this instance's context 91 * \retval #VPX_CODEC_OK 92 * The input stream was recognized and decoder initialized. 93 * \retval #VPX_CODEC_MEM_ERROR 94 * Memory operation failed. 95 */ 96 typedef vpx_codec_err_t (*vpx_codec_destroy_fn_t)(vpx_codec_alg_priv_t *ctx); 97 98 /*!\brief parse stream info function pointer prototype 99 * 100 * Performs high level parsing of the bitstream. This function is called by the 101 * generic vpx_codec_peek_stream_info() wrapper function, so plugins 102 * implementing this interface may trust the input parameters to be properly 103 * initialized. 104 * 105 * \param[in] data Pointer to a block of data to parse 106 * \param[in] data_sz Size of the data buffer 107 * \param[in,out] si Pointer to stream info to update. The size member 108 * \ref MUST be properly initialized, but \ref MAY be 109 * clobbered by the algorithm. This parameter \ref MAY 110 * be NULL. 111 * 112 * \retval #VPX_CODEC_OK 113 * Bitstream is parsable and stream information updated 114 */ 115 typedef vpx_codec_err_t (*vpx_codec_peek_si_fn_t)(const uint8_t *data, 116 unsigned int data_sz, 117 vpx_codec_stream_info_t *si); 118 119 /*!\brief Return information about the current stream. 120 * 121 * Returns information about the stream that has been parsed during decoding. 122 * 123 * \param[in] ctx Pointer to this instance's context 124 * \param[in,out] si Pointer to stream info to update. The size member 125 * \ref MUST be properly initialized, but \ref MAY be 126 * clobbered by the algorithm. This parameter \ref MAY 127 * be NULL. 128 * 129 * \retval #VPX_CODEC_OK 130 * Bitstream is parsable and stream information updated 131 */ 132 typedef vpx_codec_err_t (*vpx_codec_get_si_fn_t)(vpx_codec_alg_priv_t *ctx, 133 vpx_codec_stream_info_t *si); 134 135 /*!\brief control function pointer prototype 136 * 137 * This function is used to exchange algorithm specific data with the decoder 138 * instance. This can be used to implement features specific to a particular 139 * algorithm. 140 * 141 * This function is called by the generic vpx_codec_control() wrapper 142 * function, so plugins implementing this interface may trust the input 143 * parameters to be properly initialized. However, this interface does not 144 * provide type safety for the exchanged data or assign meanings to the 145 * control codes. Those details should be specified in the algorithm's 146 * header file. In particular, the ctrl_id parameter is guaranteed to exist 147 * in the algorithm's control mapping table, and the data parameter may be NULL. 148 * 149 * 150 * \param[in] ctx Pointer to this instance's context 151 * \param[in] ctrl_id Algorithm specific control identifier 152 * \param[in,out] data Data to exchange with algorithm instance. 153 * 154 * \retval #VPX_CODEC_OK 155 * The internal state data was deserialized. 156 */ 157 typedef vpx_codec_err_t (*vpx_codec_control_fn_t)(vpx_codec_alg_priv_t *ctx, 158 va_list ap); 159 160 /*!\brief control function pointer mapping 161 * 162 * This structure stores the mapping between control identifiers and 163 * implementing functions. Each algorithm provides a list of these 164 * mappings. This list is searched by the vpx_codec_control() wrapper 165 * function to determine which function to invoke. The special 166 * value {0, NULL} is used to indicate end-of-list, and must be 167 * present. The special value {0, <non-null>} can be used as a catch-all 168 * mapping. This implies that ctrl_id values chosen by the algorithm 169 * \ref MUST be non-zero. 170 */ 171 typedef const struct vpx_codec_ctrl_fn_map { 172 int ctrl_id; 173 vpx_codec_control_fn_t fn; 174 } vpx_codec_ctrl_fn_map_t; 175 176 /*!\brief decode data function pointer prototype 177 * 178 * Processes a buffer of coded data. If the processing results in a new 179 * decoded frame becoming available, #VPX_CODEC_CB_PUT_SLICE and 180 * #VPX_CODEC_CB_PUT_FRAME events are generated as appropriate. This 181 * function is called by the generic vpx_codec_decode() wrapper function, 182 * so plugins implementing this interface may trust the input parameters 183 * to be properly initialized. 184 * 185 * \param[in] ctx Pointer to this instance's context 186 * \param[in] data Pointer to this block of new coded data. If 187 * NULL, a #VPX_CODEC_CB_PUT_FRAME event is posted 188 * for the previously decoded frame. 189 * \param[in] data_sz Size of the coded data, in bytes. 190 * 191 * \return Returns #VPX_CODEC_OK if the coded data was processed completely 192 * and future pictures can be decoded without error. Otherwise, 193 * see the descriptions of the other error codes in ::vpx_codec_err_t 194 * for recoverability capabilities. 195 */ 196 typedef vpx_codec_err_t (*vpx_codec_decode_fn_t)(vpx_codec_alg_priv_t *ctx, 197 const uint8_t *data, 198 unsigned int data_sz, 199 void *user_priv, 200 long deadline); 201 202 /*!\brief Decoded frames iterator 203 * 204 * Iterates over a list of the frames available for display. The iterator 205 * storage should be initialized to NULL to start the iteration. Iteration is 206 * complete when this function returns NULL. 207 * 208 * The list of available frames becomes valid upon completion of the 209 * vpx_codec_decode call, and remains valid until the next call to vpx_codec_decode. 210 * 211 * \param[in] ctx Pointer to this instance's context 212 * \param[in out] iter Iterator storage, initialized to NULL 213 * 214 * \return Returns a pointer to an image, if one is ready for display. Frames 215 * produced will always be in PTS (presentation time stamp) order. 216 */ 217 typedef vpx_image_t *(*vpx_codec_get_frame_fn_t)(vpx_codec_alg_priv_t *ctx, 218 vpx_codec_iter_t *iter); 219 220 /*!\brief Pass in external frame buffers for the decoder to use. 221 * 222 * Registers functions to be called when libvpx needs a frame buffer 223 * to decode the current frame and a function to be called when libvpx does 224 * not internally reference the frame buffer. This set function must 225 * be called before the first call to decode or libvpx will assume the 226 * default behavior of allocating frame buffers internally. 227 * 228 * \param[in] ctx Pointer to this instance's context 229 * \param[in] cb_get Pointer to the get callback function 230 * \param[in] cb_release Pointer to the release callback function 231 * \param[in] cb_priv Callback's private data 232 * 233 * \retval #VPX_CODEC_OK 234 * External frame buffers will be used by libvpx. 235 * \retval #VPX_CODEC_INVALID_PARAM 236 * One or more of the callbacks were NULL. 237 * \retval #VPX_CODEC_ERROR 238 * Decoder context not initialized, or algorithm not capable of 239 * using external frame buffers. 240 * 241 * \note 242 * When decoding VP9, the application may be required to pass in at least 243 * #VP9_MAXIMUM_REF_BUFFERS + #VPX_MAXIMUM_WORK_BUFFERS external frame 244 * buffers. 245 */ 246 typedef vpx_codec_err_t (*vpx_codec_set_fb_fn_t)( 247 vpx_codec_alg_priv_t *ctx, 248 vpx_get_frame_buffer_cb_fn_t cb_get, 249 vpx_release_frame_buffer_cb_fn_t cb_release, void *cb_priv); 250 251 252 typedef vpx_codec_err_t (*vpx_codec_encode_fn_t)(vpx_codec_alg_priv_t *ctx, 253 const vpx_image_t *img, 254 vpx_codec_pts_t pts, 255 unsigned long duration, 256 vpx_enc_frame_flags_t flags, 257 unsigned long deadline); 258 typedef const vpx_codec_cx_pkt_t *(*vpx_codec_get_cx_data_fn_t)(vpx_codec_alg_priv_t *ctx, 259 vpx_codec_iter_t *iter); 260 261 typedef vpx_codec_err_t 262 (*vpx_codec_enc_config_set_fn_t)(vpx_codec_alg_priv_t *ctx, 263 const vpx_codec_enc_cfg_t *cfg); 264 typedef vpx_fixed_buf_t * 265 (*vpx_codec_get_global_headers_fn_t)(vpx_codec_alg_priv_t *ctx); 266 267 typedef vpx_image_t * 268 (*vpx_codec_get_preview_frame_fn_t)(vpx_codec_alg_priv_t *ctx); 269 270 typedef vpx_codec_err_t 271 (*vpx_codec_enc_mr_get_mem_loc_fn_t)(const vpx_codec_enc_cfg_t *cfg, 272 void **mem_loc); 273 274 /*!\brief usage configuration mapping 275 * 276 * This structure stores the mapping between usage identifiers and 277 * configuration structures. Each algorithm provides a list of these 278 * mappings. This list is searched by the vpx_codec_enc_config_default() 279 * wrapper function to determine which config to return. The special value 280 * {-1, {0}} is used to indicate end-of-list, and must be present. At least 281 * one mapping must be present, in addition to the end-of-list. 282 * 283 */ 284 typedef const struct vpx_codec_enc_cfg_map { 285 int usage; 286 vpx_codec_enc_cfg_t cfg; 287 } vpx_codec_enc_cfg_map_t; 288 289 #define NOT_IMPLEMENTED 0 290 291 /*!\brief Decoder algorithm interface interface 292 * 293 * All decoders \ref MUST expose a variable of this type. 294 */ 295 struct vpx_codec_iface { 296 const char *name; /**< Identification String */ 297 int abi_version; /**< Implemented ABI version */ 298 vpx_codec_caps_t caps; /**< Decoder capabilities */ 299 vpx_codec_init_fn_t init; /**< \copydoc ::vpx_codec_init_fn_t */ 300 vpx_codec_destroy_fn_t destroy; /**< \copydoc ::vpx_codec_destroy_fn_t */ 301 vpx_codec_ctrl_fn_map_t *ctrl_maps; /**< \copydoc ::vpx_codec_ctrl_fn_map_t */ 302 struct vpx_codec_dec_iface { 303 vpx_codec_peek_si_fn_t peek_si; /**< \copydoc ::vpx_codec_peek_si_fn_t */ 304 vpx_codec_get_si_fn_t get_si; /**< \copydoc ::vpx_codec_get_si_fn_t */ 305 vpx_codec_decode_fn_t decode; /**< \copydoc ::vpx_codec_decode_fn_t */ 306 vpx_codec_get_frame_fn_t get_frame; /**< \copydoc ::vpx_codec_get_frame_fn_t */ 307 vpx_codec_set_fb_fn_t set_fb_fn; /**< \copydoc ::vpx_codec_set_fb_fn_t */ 308 } dec; 309 struct vpx_codec_enc_iface { 310 int cfg_map_count; 311 vpx_codec_enc_cfg_map_t *cfg_maps; /**< \copydoc ::vpx_codec_enc_cfg_map_t */ 312 vpx_codec_encode_fn_t encode; /**< \copydoc ::vpx_codec_encode_fn_t */ 313 vpx_codec_get_cx_data_fn_t get_cx_data; /**< \copydoc ::vpx_codec_get_cx_data_fn_t */ 314 vpx_codec_enc_config_set_fn_t cfg_set; /**< \copydoc ::vpx_codec_enc_config_set_fn_t */ 315 vpx_codec_get_global_headers_fn_t get_glob_hdrs; /**< \copydoc ::vpx_codec_get_global_headers_fn_t */ 316 vpx_codec_get_preview_frame_fn_t get_preview; /**< \copydoc ::vpx_codec_get_preview_frame_fn_t */ 317 vpx_codec_enc_mr_get_mem_loc_fn_t mr_get_mem_loc; /**< \copydoc ::vpx_codec_enc_mr_get_mem_loc_fn_t */ 318 } enc; 319 }; 320 321 /*!\brief Callback function pointer / user data pair storage */ 322 typedef struct vpx_codec_priv_cb_pair { 323 union { 324 vpx_codec_put_frame_cb_fn_t put_frame; 325 vpx_codec_put_slice_cb_fn_t put_slice; 326 } u; 327 void *user_priv; 328 } vpx_codec_priv_cb_pair_t; 329 330 331 /*!\brief Instance private storage 332 * 333 * This structure is allocated by the algorithm's init function. It can be 334 * extended in one of two ways. First, a second, algorithm specific structure 335 * can be allocated and the priv member pointed to it. Alternatively, this 336 * structure can be made the first member of the algorithm specific structure, 337 * and the pointer cast to the proper type. 338 */ 339 struct vpx_codec_priv { 340 unsigned int sz; 341 vpx_codec_iface_t *iface; 342 struct vpx_codec_alg_priv *alg_priv; 343 const char *err_detail; 344 vpx_codec_flags_t init_flags; 345 struct { 346 vpx_codec_priv_cb_pair_t put_frame_cb; 347 vpx_codec_priv_cb_pair_t put_slice_cb; 348 } dec; 349 struct { 350 int tbd; 351 struct vpx_fixed_buf cx_data_dst_buf; 352 unsigned int cx_data_pad_before; 353 unsigned int cx_data_pad_after; 354 vpx_codec_cx_pkt_t cx_data_pkt; 355 unsigned int total_encoders; 356 } enc; 357 }; 358 359 /* 360 * Multi-resolution encoding internal configuration 361 */ 362 struct vpx_codec_priv_enc_mr_cfg 363 { 364 unsigned int mr_total_resolutions; 365 unsigned int mr_encoder_id; 366 struct vpx_rational mr_down_sampling_factor; 367 void* mr_low_res_mode_info; 368 }; 369 370 #undef VPX_CTRL_USE_TYPE 371 #define VPX_CTRL_USE_TYPE(id, typ) \ 372 static VPX_INLINE typ id##__value(va_list args) {return va_arg(args, typ);} 373 374 #undef VPX_CTRL_USE_TYPE_DEPRECATED 375 #define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ) \ 376 static VPX_INLINE typ id##__value(va_list args) {return va_arg(args, typ);} 377 378 #define CAST(id, arg) id##__value(arg) 379 380 /* CODEC_INTERFACE convenience macro 381 * 382 * By convention, each codec interface is a struct with extern linkage, where 383 * the symbol is suffixed with _algo. A getter function is also defined to 384 * return a pointer to the struct, since in some cases it's easier to work 385 * with text symbols than data symbols (see issue #169). This function has 386 * the same name as the struct, less the _algo suffix. The CODEC_INTERFACE 387 * macro is provided to define this getter function automatically. 388 */ 389 #define CODEC_INTERFACE(id)\ 390 vpx_codec_iface_t* id(void) { return &id##_algo; }\ 391 vpx_codec_iface_t id##_algo 392 393 394 /* Internal Utility Functions 395 * 396 * The following functions are intended to be used inside algorithms as 397 * utilities for manipulating vpx_codec_* data structures. 398 */ 399 struct vpx_codec_pkt_list { 400 unsigned int cnt; 401 unsigned int max; 402 struct vpx_codec_cx_pkt pkts[1]; 403 }; 404 405 #define vpx_codec_pkt_list_decl(n)\ 406 union {struct vpx_codec_pkt_list head;\ 407 struct {struct vpx_codec_pkt_list head;\ 408 struct vpx_codec_cx_pkt pkts[n];} alloc;} 409 410 #define vpx_codec_pkt_list_init(m)\ 411 (m)->alloc.head.cnt = 0,\ 412 (m)->alloc.head.max = sizeof((m)->alloc.pkts) / sizeof((m)->alloc.pkts[0]) 413 414 int 415 vpx_codec_pkt_list_add(struct vpx_codec_pkt_list *, 416 const struct vpx_codec_cx_pkt *); 417 418 const vpx_codec_cx_pkt_t * 419 vpx_codec_pkt_list_get(struct vpx_codec_pkt_list *list, 420 vpx_codec_iter_t *iter); 421 422 423 #include <stdio.h> 424 #include <setjmp.h> 425 426 struct vpx_internal_error_info { 427 vpx_codec_err_t error_code; 428 int has_detail; 429 char detail[80]; 430 int setjmp; 431 jmp_buf jmp; 432 }; 433 434 void vpx_internal_error(struct vpx_internal_error_info *info, 435 vpx_codec_err_t error, 436 const char *fmt, 437 ...); 438 439 #ifdef __cplusplus 440 } // extern "C" 441 #endif 442 443 #endif // VPX_INTERNAL_VPX_CODEC_INTERNAL_H_ 444