Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ******************************************************************************/ |
| 18 | /** |
| 19 | ******************************************************************************* |
| 20 | * @file |
| 21 | * ihevc_buf_mgr.c |
| 22 | * |
| 23 | * @brief |
| 24 | * Contains function definitions for buffer management |
| 25 | * |
| 26 | * @author |
| 27 | * Srinivas T |
| 28 | * |
| 29 | * @par List of Functions: |
| 30 | * - ihevc_buf_mgr_init() |
| 31 | * - ihevc_buf_mgr_add() |
| 32 | * - ihevc_buf_mgr_get_next_free() |
| 33 | * - ihevc_buf_mgr_check_free() |
| 34 | * - ihevc_buf_mgr_release() |
| 35 | * - ihevc_buf_mgr_set_status() |
| 36 | * - ihevc_buf_mgr_get_status() |
| 37 | * - ihevc_buf_mgr_get_buf() |
| 38 | * - ihevc_buf_mgr_get_num_active_buf() |
| 39 | * |
| 40 | * @remarks |
| 41 | * None |
| 42 | * |
| 43 | ******************************************************************************* |
| 44 | */ |
| 45 | #include <stdlib.h> |
| 46 | #include "ihevc_typedefs.h" |
| 47 | #include "ihevc_macros.h" |
| 48 | #include "ihevc_func_selector.h" |
| 49 | #include "ihevc_buf_mgr.h" |
| 50 | |
| 51 | |
| 52 | /** |
| 53 | ******************************************************************************* |
| 54 | * |
| 55 | * @brief |
| 56 | * Buffer manager initialization function. |
| 57 | * |
| 58 | * @par Description: |
| 59 | * Initializes the buffer manager structure |
| 60 | * |
| 61 | * @param[in] ps_buf_mgr |
| 62 | * Pointer to the buffer manager |
| 63 | * |
| 64 | * @returns |
| 65 | * |
| 66 | * @remarks |
| 67 | * None |
| 68 | * |
| 69 | ******************************************************************************* |
| 70 | */ |
| 71 | |
| 72 | void ihevc_buf_mgr_init( |
| 73 | buf_mgr_t *ps_buf_mgr) |
| 74 | { |
| 75 | WORD32 id; |
| 76 | |
| 77 | ps_buf_mgr->u4_max_buf_cnt = BUF_MGR_MAX_CNT; |
| 78 | ps_buf_mgr->u4_active_buf_cnt = 0; |
| 79 | |
| 80 | for(id = 0; id < BUF_MGR_MAX_CNT; id++) |
| 81 | { |
| 82 | ps_buf_mgr->au4_status[id] = 0; |
| 83 | ps_buf_mgr->apv_ptr[id] = NULL; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | |
| 88 | /** |
| 89 | ******************************************************************************* |
| 90 | * |
| 91 | * @brief |
| 92 | * Adds and increments the buffer and buffer count. |
| 93 | * |
| 94 | * @par Description: |
| 95 | * Adds a buffer to the buffer manager if it is not already present and |
| 96 | * increments the active buffer count |
| 97 | * |
| 98 | * @param[in] ps_buf_mgr |
| 99 | * Pointer to the buffer manager |
| 100 | * |
| 101 | * @param[in] pv_ptr |
| 102 | * Pointer to the buffer to be added |
| 103 | * |
| 104 | * @returns Returns 0 on success, -1 otherwise |
| 105 | * |
| 106 | * @remarks |
| 107 | * None |
| 108 | * |
| 109 | ******************************************************************************* |
| 110 | */ |
| 111 | WORD32 ihevc_buf_mgr_add( |
| 112 | buf_mgr_t *ps_buf_mgr, |
| 113 | void *pv_ptr, |
| 114 | WORD32 buf_id) |
| 115 | { |
| 116 | |
| 117 | /* Check if buffer ID is within allowed range */ |
| 118 | if(buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt) |
| 119 | { |
| 120 | return (-1); |
| 121 | } |
| 122 | |
| 123 | /* Check if the current ID is being used to hold some other buffer */ |
| 124 | if((ps_buf_mgr->apv_ptr[buf_id] != NULL) && |
| 125 | (ps_buf_mgr->apv_ptr[buf_id] != pv_ptr)) |
| 126 | { |
| 127 | return (-1); |
| 128 | } |
| 129 | ps_buf_mgr->apv_ptr[buf_id] = pv_ptr; |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | |
| 135 | /** |
| 136 | ******************************************************************************* |
| 137 | * |
| 138 | * @brief |
| 139 | * Gets the next free buffer. |
| 140 | * |
| 141 | * @par Description: |
| 142 | * Returns the next free buffer available and sets the corresponding status |
| 143 | * to DEC |
| 144 | * |
| 145 | * @param[in] ps_buf_mgr |
| 146 | * Pointer to the buffer manager |
| 147 | * |
| 148 | * @param[in] pi4_buf_id |
| 149 | * Pointer to the id of the free buffer |
| 150 | * |
| 151 | * @returns Pointer to the free buffer |
| 152 | * |
| 153 | * @remarks |
| 154 | * None |
| 155 | * |
| 156 | ******************************************************************************* |
| 157 | */ |
| 158 | void* ihevc_buf_mgr_get_next_free( |
| 159 | buf_mgr_t *ps_buf_mgr, |
| 160 | WORD32 *pi4_buf_id) |
| 161 | { |
| 162 | WORD32 id; |
| 163 | void *pv_ret_ptr; |
| 164 | |
| 165 | pv_ret_ptr = NULL; |
| 166 | for(id = 0; id < (WORD32)ps_buf_mgr->u4_max_buf_cnt; id++) |
| 167 | { |
| 168 | /* Check if the buffer is non-null and status is zero */ |
| 169 | if((ps_buf_mgr->au4_status[id] == 0) && (ps_buf_mgr->apv_ptr[id])) |
| 170 | { |
| 171 | *pi4_buf_id = id; |
| 172 | /* DEC is set to 1 */ |
| 173 | ps_buf_mgr->au4_status[id] = 1; |
| 174 | pv_ret_ptr = ps_buf_mgr->apv_ptr[id]; |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | return pv_ret_ptr; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | /** |
| 184 | ******************************************************************************* |
| 185 | * |
| 186 | * @brief |
| 187 | * Checks the buffer manager for free buffers available. |
| 188 | * |
| 189 | * @par Description: |
| 190 | * Checks if there are any free buffers available |
| 191 | * |
| 192 | * @param[in] ps_buf_mgr |
| 193 | * Pointer to the buffer manager |
| 194 | * |
| 195 | * @returns Returns 0 if available, -1 otherwise |
| 196 | * |
| 197 | * @remarks |
| 198 | * None |
| 199 | * |
| 200 | ******************************************************************************* |
| 201 | */ |
| 202 | WORD32 ihevc_buf_mgr_check_free( |
| 203 | buf_mgr_t *ps_buf_mgr) |
| 204 | { |
| 205 | UWORD32 id; |
| 206 | |
| 207 | for(id = 0; id < ps_buf_mgr->u4_max_buf_cnt; id++) |
| 208 | { |
| 209 | if((ps_buf_mgr->au4_status[id] == 0) && |
| 210 | (ps_buf_mgr->apv_ptr[id])) |
| 211 | { |
| 212 | return 1; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | return 0; |
| 217 | |
| 218 | } |
| 219 | |
| 220 | |
| 221 | /** |
| 222 | ******************************************************************************* |
| 223 | * |
| 224 | * @brief |
| 225 | * Resets the status bits. |
| 226 | * |
| 227 | * @par Description: |
| 228 | * resets the status bits that the mask contains (status corresponding to |
| 229 | * the id) |
| 230 | * |
| 231 | * @param[in] ps_buf_mgr |
| 232 | * Pointer to the buffer manager |
| 233 | * |
| 234 | * @param[in] buf_id |
| 235 | * ID of the buffer status to be released |
| 236 | * |
| 237 | * @param[in] mask |
| 238 | * Contains the bits that are to be reset |
| 239 | * |
| 240 | * @returns 0 if success, -1 otherwise |
| 241 | * |
| 242 | * @remarks |
| 243 | * None |
| 244 | * |
| 245 | ******************************************************************************* |
| 246 | */ |
| 247 | WORD32 ihevc_buf_mgr_release( |
| 248 | buf_mgr_t *ps_buf_mgr, |
| 249 | WORD32 buf_id, |
| 250 | UWORD32 mask) |
| 251 | { |
| 252 | /* If the given id is pointing to an id which is not yet added */ |
| 253 | if(buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt) |
| 254 | { |
| 255 | return (-1); |
| 256 | } |
| 257 | |
| 258 | ps_buf_mgr->au4_status[buf_id] &= ~mask; |
| 259 | |
| 260 | /* If both the REF and DISP are zero, DEC is set to zero */ |
| 261 | if(ps_buf_mgr->au4_status[buf_id] == 1) |
| 262 | { |
| 263 | ps_buf_mgr->au4_status[buf_id] = 0; |
| 264 | } |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | |
| 270 | /** |
| 271 | ******************************************************************************* |
| 272 | * |
| 273 | * @brief |
| 274 | * Sets the status bit. |
| 275 | * |
| 276 | * @par Description: |
| 277 | * sets the status bits that the mask contains (status corresponding to the |
| 278 | * id) |
| 279 | * |
| 280 | * |
| 281 | * @param[in] ps_buf_mgr |
| 282 | * Pointer to the buffer manager |
| 283 | * |
| 284 | * @param[in] buf_id |
| 285 | * ID of the buffer whose status needs to be modified |
| 286 | * |
| 287 | * |
| 288 | * @param[in] mask |
| 289 | * Contains the bits that are to be set |
| 290 | * |
| 291 | * @returns 0 if success, -1 otherwise |
| 292 | * |
| 293 | * @remarks |
| 294 | * None |
| 295 | * |
| 296 | ******************************************************************************* |
| 297 | */ |
| 298 | WORD32 ihevc_buf_mgr_set_status( |
| 299 | buf_mgr_t *ps_buf_mgr, |
| 300 | WORD32 buf_id, |
| 301 | UWORD32 mask) |
| 302 | { |
| 303 | if(buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt) |
| 304 | { |
| 305 | return (-1); |
| 306 | } |
| 307 | |
| 308 | |
| 309 | if((ps_buf_mgr->au4_status[buf_id] & mask) != 0) |
| 310 | { |
| 311 | return (-1); |
| 312 | } |
| 313 | |
| 314 | ps_buf_mgr->au4_status[buf_id] |= mask; |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | |
| 319 | /** |
| 320 | ******************************************************************************* |
| 321 | * |
| 322 | * @brief |
| 323 | * Returns the status of the buffer. |
| 324 | * |
| 325 | * @par Description: |
| 326 | * Returns the status of the buffer corresponding to the id |
| 327 | * |
| 328 | * @param[in] ps_buf_mgr |
| 329 | * Pointer to the buffer manager |
| 330 | * |
| 331 | * @param[in] buf_id |
| 332 | * ID of the buffer status required |
| 333 | * |
| 334 | * @returns Status of the buffer corresponding to the id |
| 335 | * |
| 336 | * @remarks |
| 337 | * None |
| 338 | * |
| 339 | ******************************************************************************* |
| 340 | */ |
| 341 | UWORD32 ihevc_buf_mgr_get_status( |
| 342 | buf_mgr_t *ps_buf_mgr, |
| 343 | WORD32 buf_id) |
| 344 | { |
| 345 | return ps_buf_mgr->au4_status[buf_id]; |
| 346 | } |
| 347 | |
| 348 | |
| 349 | /** |
| 350 | ******************************************************************************* |
| 351 | * |
| 352 | * @brief |
| 353 | * Gets the buffer from the buffer manager |
| 354 | * |
| 355 | * @par Description: |
| 356 | * Returns the pointer to the buffer corresponding to the id |
| 357 | * |
| 358 | * @param[in] ps_buf_mgr |
| 359 | * Pointer to the buffer manager |
| 360 | * |
| 361 | * @param[in] buf_id |
| 362 | * ID of the buffer required |
| 363 | * |
| 364 | * @returns Pointer to the buffer required |
| 365 | * |
| 366 | * @remarks |
| 367 | * None |
| 368 | * |
| 369 | ******************************************************************************* |
| 370 | */ |
| 371 | void* ihevc_buf_mgr_get_buf( |
| 372 | buf_mgr_t *ps_buf_mgr, |
| 373 | WORD32 buf_id) |
| 374 | { |
| 375 | return ps_buf_mgr->apv_ptr[buf_id]; |
| 376 | } |
| 377 | |
| 378 | |
| 379 | /** |
| 380 | ******************************************************************************* |
| 381 | * |
| 382 | * @brief |
| 383 | * Gets the no.of active buffer |
| 384 | * |
| 385 | * @par Description: |
| 386 | * Return the number of active buffers in the buffer manager |
| 387 | * |
| 388 | * @param[in] ps_buf_mgr |
| 389 | * Pointer to the buffer manager |
| 390 | * |
| 391 | * @returns number of active buffers |
| 392 | * |
| 393 | * @remarks |
| 394 | * None |
| 395 | * |
| 396 | ******************************************************************************* |
| 397 | */ |
| 398 | UWORD32 ihevc_buf_mgr_get_num_active_buf( |
| 399 | buf_mgr_t *ps_buf_mgr) |
| 400 | { |
| 401 | return ps_buf_mgr->u4_max_buf_cnt; |
| 402 | } |