src/tdm_capture.c

   1 /**************************************************************************
   2  *
   3  * libtdm
   4  *
   5  * Copyright 2015 Samsung Electronics co., Ltd. All Rights Reserved.
   6  *
   7  * Contact: Eunchul Kim <chulspro.kim@samsung.com>,
   8  *          JinYoung Jeon <jy0.jeon@samsung.com>,
   9  *          Taeheon Kim <th908.kim@samsung.com>,
  10  *          YoungJun Cho <yj44.cho@samsung.com>,
  11  *          SooChan Lim <sc1.lim@samsung.com>,
  12  *          Boram Park <sc1.lim@samsung.com>
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the
  16  * "Software"), to deal in the Software without restriction, including
  17  * without limitation the rights to use, copy, modify, merge, publish,
  18  * distribute, sub license, and/or sell copies of the Software, and to
  19  * permit persons to whom the Software is furnished to do so, subject to
  20  * the following conditions:
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  27  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  29  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  30  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  31  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  32  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33  *
  34 **************************************************************************/
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include "tdm.h"
  41 #include "tdm_backend.h"
  42 #include "tdm_private.h"
  43 #include "tdm_helper.h"
  44
  45 #define CAPTURE_FUNC_ENTRY() \
  46         tdm_func_capture *func_capture; \
  47         tdm_private_display *private_display; \
  48         tdm_private_capture *private_capture; \
  49         tdm_error ret = TDM_ERROR_NONE; \
  50         TDM_RETURN_VAL_IF_FAIL(capture != NULL, TDM_ERROR_INVALID_PARAMETER); \
  51         private_capture = (tdm_private_capture*)capture; \
  52         private_display = private_capture->private_display; \
  53         func_capture = &private_display->func_capture
  54
  55 static void
  56 _tdm_capture_print_list(struct list_head *list)
  57 {
  58         tdm_capture_private_buffer *b = NULL;
  59         char str[512], *p;
  60         int len = sizeof(str);
  61
  62         TDM_RETURN_IF_FAIL(list != NULL);
  63
  64         p = str;
  65         LIST_FOR_EACH_ENTRY(b, list, link) {
  66                 if (len > 0) {
  67                         int l = snprintf(p, len, " (%p)", b->buffer);
  68                         p += l;
  69                         len -= l;
  70                 } else
  71                         break;
  72         }
  73
  74         TDM_INFO("\t %s", str);
  75 }
  76
  77 static tdm_capture_private_buffer *
  78 _tdm_capture_find_tbm_buffer(struct list_head *list, tbm_surface_h buffer)
  79 {
  80         tdm_capture_private_buffer *b = NULL, *bb = NULL;
  81
  82         LIST_FOR_EACH_ENTRY_SAFE(b, bb, list, link) {
  83                 if (b->buffer == buffer)
  84                         return b;
  85         }
  86
  87         return NULL;
  88 }
  89
  90 static tdm_capture_private_buffer *
  91 _tdm_capture_find_buffer(struct list_head *list, tdm_capture_private_buffer *capture_buffer)
  92 {
  93         tdm_capture_private_buffer *b = NULL, *bb = NULL;
  94
  95         LIST_FOR_EACH_ENTRY_SAFE(b, bb, list, link) {
  96                 if (b == capture_buffer)
  97                         return b;
  98         }
  99
 100         return NULL;
 101 }
 102
 103 INTERN void
 104 tdm_capture_cb_done(tdm_capture *capture_backend, tbm_surface_h buffer,
 105                                         void *user_data)
 106 {
 107         tdm_private_capture *private_capture = user_data;
 108         tdm_private_display *private_display = private_capture->private_display;
 109         tdm_capture_private_buffer *capture_buffer = NULL, *first_entry = NULL;
 110
 111         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 112
 113         if (private_capture->owner_tid != syscall(SYS_gettid)) {
 114                 tdm_thread_cb_capture_done capture_done;
 115                 tdm_error ret;
 116
 117                 capture_done.base.type = TDM_THREAD_CB_CAPTURE_DONE;
 118                 capture_done.base.length = sizeof capture_done;
 119                 capture_done.capture_stamp = private_capture->stamp;
 120                 capture_done.buffer = buffer;
 121                 capture_done.user_data = user_data;
 122
 123                 ret = tdm_thread_send_cb(private_display->private_loop, &capture_done.base);
 124                 TDM_WARNING_IF_FAIL(ret == TDM_ERROR_NONE);
 125
 126                 return;
 127         }
 128
 129         if (private_capture->owner_tid != syscall(SYS_gettid))
 130                 TDM_NEVER_GET_HERE();
 131
 132         if (tdm_debug_dump & TDM_DUMP_FLAG_CAPTURE) {
 133                 char str[TDM_PATH_LEN];
 134                 static int i;
 135                 snprintf(str, TDM_PATH_LEN, "capture_%03d", i++);
 136                 tdm_helper_dump_buffer_str(buffer, tdm_debug_dump_dir, str);
 137         }
 138
 139         if (tdm_debug_module & TDM_DEBUG_BUFFER)
 140                 TDM_INFO("capture(%p) done: %p", private_capture, buffer);
 141
 142         if (!LIST_IS_EMPTY(&private_capture->buffer_list)) {
 143                 first_entry = container_of((&private_capture->buffer_list)->next, capture_buffer, link);
 144                 if (first_entry->buffer != buffer)
 145                         TDM_ERR("buffer(%p) is skipped", first_entry->buffer);
 146         } else {
 147                 TDM_NEVER_GET_HERE();
 148         }
 149
 150         if ((capture_buffer = _tdm_capture_find_tbm_buffer(&private_capture->buffer_list, buffer))) {
 151                 LIST_DEL(&capture_buffer->link);
 152                 LIST_DELINIT(&capture_buffer->commit_link);
 153
 154                 _pthread_mutex_unlock(&private_display->lock);
 155                 if (private_capture->done_func)
 156                         private_capture->done_func(capture_buffer, buffer, private_capture->done_user_data);
 157                 tdm_buffer_unref_backend(buffer);
 158                 _pthread_mutex_lock(&private_display->lock);
 159
 160                 free(capture_buffer);
 161         }
 162 }
 163
 164 INTERN tdm_private_capture *
 165 tdm_capture_find_stamp(tdm_private_display *private_display, double stamp)
 166 {
 167         tdm_private_capture *private_capture = NULL;
 168
 169         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), NULL);
 170
 171         LIST_FOR_EACH_ENTRY(private_capture, &private_display->capture_list, display_link) {
 172                 if (private_capture->stamp == stamp)
 173                         return private_capture;
 174         }
 175
 176         return NULL;
 177 }
 178
 179 INTERN tdm_private_capture *
 180 tdm_capture_create_output_internal(tdm_private_output *private_output,
 181                                                                    tdm_error *error)
 182 {
 183         tdm_private_display *private_display = private_output->private_display;
 184         tdm_func_output *func_output = &private_display->func_output;
 185         tdm_func_capture *func_capture = &private_display->func_capture;
 186         tdm_private_capture *private_capture = NULL;
 187         tdm_capture *capture_backend = NULL;
 188         tdm_error ret = TDM_ERROR_NONE;
 189
 190         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), NULL);
 191
 192         if (!(private_display->capabilities & TDM_DISPLAY_CAPABILITY_CAPTURE)) {
 193                 TDM_ERR("no capture capability");
 194                 if (error)
 195                         *error = TDM_ERROR_NO_CAPABILITY;
 196                 return NULL;
 197         }
 198
 199         if (!(private_display->caps_capture.capabilities & TDM_CAPTURE_CAPABILITY_OUTPUT)) {
 200                 TDM_ERR("no output capture capability");
 201                 if (error)
 202                         *error = TDM_ERROR_NO_CAPABILITY;
 203                 return NULL;
 204         }
 205
 206         capture_backend = func_output->output_create_capture(
 207                                                   private_output->output_backend, &ret);
 208         if (ret != TDM_ERROR_NONE) {
 209                 if (error)
 210                         *error = ret;
 211                 return NULL;
 212         }
 213
 214         private_capture = calloc(1, sizeof(tdm_private_capture));
 215         if (!private_capture) {
 216                 TDM_ERR("failed: alloc memory");
 217                 func_capture->capture_destroy(capture_backend);
 218                 if (error)
 219                         *error = TDM_ERROR_OUT_OF_MEMORY;
 220                 return NULL;
 221         }
 222
 223         ret = func_capture->capture_set_done_handler(capture_backend,
 224                         tdm_capture_cb_done, private_capture);
 225         if (ret != TDM_ERROR_NONE) {
 226                 TDM_ERR("capture(%p) set capture_done_handler failed", private_capture);
 227                 func_capture->capture_destroy(capture_backend);
 228                 if (error)
 229                         *error = ret;
 230                 return NULL;
 231         }
 232
 233         private_capture->stamp = tdm_helper_get_time();
 234         while (tdm_capture_find_stamp(private_display, private_capture->stamp))
 235                 private_capture->stamp++;
 236
 237         LIST_ADD(&private_capture->link, &private_output->capture_list);
 238         LIST_ADD(&private_capture->display_link, &private_display->capture_list);
 239
 240         private_capture->target = TDM_CAPTURE_TARGET_OUTPUT;
 241         private_capture->private_display = private_display;
 242         private_capture->private_output = private_output;
 243         private_capture->private_layer = NULL;
 244         private_capture->capture_backend = capture_backend;
 245         private_capture->owner_tid = syscall(SYS_gettid);
 246
 247         LIST_INITHEAD(&private_capture->pending_buffer_list);
 248         LIST_INITHEAD(&private_capture->buffer_list);
 249
 250         TDM_DBG("capture(%p) create", private_capture);
 251
 252         if (error)
 253                 *error = TDM_ERROR_NONE;
 254
 255         return private_capture;
 256 }
 257
 258 INTERN tdm_private_capture *
 259 tdm_capture_create_layer_internal(tdm_private_layer *private_layer,
 260                                                                   tdm_error *error)
 261 {
 262         tdm_private_output *private_output = private_layer->private_output;
 263         tdm_private_display *private_display = private_output->private_display;
 264         tdm_func_layer *func_layer = &private_display->func_layer;
 265         tdm_func_capture *func_capture = &private_display->func_capture;
 266         tdm_private_capture *private_capture = NULL;
 267         tdm_capture *capture_backend = NULL;
 268         tdm_error ret = TDM_ERROR_NONE;
 269
 270         TDM_RETURN_VAL_IF_FAIL(TDM_MUTEX_IS_LOCKED(), NULL);
 271
 272         if (!(private_display->capabilities & TDM_DISPLAY_CAPABILITY_CAPTURE)) {
 273                 TDM_ERR("no capture capability");
 274                 if (error)
 275                         *error = TDM_ERROR_NO_CAPABILITY;
 276                 return NULL;
 277         }
 278
 279         if (!(private_display->caps_capture.capabilities & TDM_CAPTURE_CAPABILITY_LAYER)) {
 280                 TDM_ERR("no layer capture capability");
 281                 if (error)
 282                         *error = TDM_ERROR_NO_CAPABILITY;
 283                 return NULL;
 284         }
 285
 286         capture_backend = func_layer->layer_create_capture(private_layer->layer_backend,
 287                                           &ret);
 288         if (ret != TDM_ERROR_NONE)
 289                 return NULL;
 290
 291         private_capture = calloc(1, sizeof(tdm_private_capture));
 292         if (!private_capture) {
 293                 TDM_ERR("failed: alloc memory");
 294                 func_capture->capture_destroy(capture_backend);
 295                 if (error)
 296                         *error = TDM_ERROR_OUT_OF_MEMORY;
 297                 return NULL;
 298         }
 299
 300         private_capture->stamp = tdm_helper_get_time();
 301         while (tdm_capture_find_stamp(private_display, private_capture->stamp))
 302                 private_capture->stamp++;
 303
 304         LIST_ADD(&private_capture->link, &private_layer->capture_list);
 305         LIST_ADD(&private_capture->display_link, &private_display->capture_list);
 306
 307         private_capture->target = TDM_CAPTURE_TARGET_LAYER;
 308         private_capture->private_display = private_display;
 309         private_capture->private_output = private_output;
 310         private_capture->private_layer = private_layer;
 311         private_capture->capture_backend = capture_backend;
 312         private_capture->owner_tid = syscall(SYS_gettid);
 313
 314         LIST_INITHEAD(&private_capture->pending_buffer_list);
 315         LIST_INITHEAD(&private_capture->buffer_list);
 316
 317         TDM_DBG("capture(%p) create", private_capture);
 318
 319         if (error)
 320                 *error = TDM_ERROR_NONE;
 321
 322         return private_capture;
 323 }
 324
 325 INTERN void
 326 tdm_capture_destroy_internal(tdm_private_capture *private_capture)
 327 {
 328         tdm_private_display *private_display;
 329         tdm_func_capture *func_capture;
 330         tdm_capture_private_buffer *b = NULL, *bb = NULL;
 331         struct list_head clone_list;
 332
 333         TDM_RETURN_IF_FAIL(TDM_MUTEX_IS_LOCKED());
 334
 335         if (!private_capture)
 336                 return;
 337
 338         private_display = private_capture->private_display;
 339
 340         LIST_DEL(&private_capture->link);
 341         LIST_DEL(&private_capture->display_link);
 342
 343         func_capture = &private_capture->private_display->func_capture;
 344         func_capture->capture_destroy(private_capture->capture_backend);
 345
 346         if (!LIST_IS_EMPTY(&private_capture->pending_buffer_list)) {
 347                 TDM_WRN("capture(%p) not finished:", private_capture);
 348                 _tdm_capture_print_list(&private_capture->pending_buffer_list);
 349
 350                 LIST_INITHEAD(&clone_list);
 351                 LIST_FOR_EACH_ENTRY_SAFE(b, bb, &private_capture->pending_buffer_list, link) {
 352                         LIST_DEL(&b->link);
 353                         LIST_ADDTAIL(&b->link, &clone_list);
 354                 }
 355
 356                 _pthread_mutex_unlock(&private_display->lock);
 357                 LIST_FOR_EACH_ENTRY_SAFE(b, bb, &clone_list, link) {
 358                         LIST_DEL(&b->link);
 359                         tdm_buffer_unref_backend(b->buffer);
 360                         free(b);
 361                 }
 362                 _pthread_mutex_lock(&private_display->lock);
 363         }
 364
 365         if (!LIST_IS_EMPTY(&private_capture->buffer_list)) {
 366                 TDM_WRN("capture(%p) not finished:", private_capture);
 367                 _tdm_capture_print_list(&private_capture->buffer_list);
 368
 369                 LIST_INITHEAD(&clone_list);
 370                 LIST_FOR_EACH_ENTRY_SAFE(b, bb, &private_capture->buffer_list, link) {
 371                         LIST_DEL(&b->link);
 372                         LIST_ADDTAIL(&b->link, &clone_list);
 373                 }
 374
 375                 _pthread_mutex_unlock(&private_display->lock);
 376                 LIST_FOR_EACH_ENTRY_SAFE(b, bb, &clone_list, link) {
 377                         LIST_DEL(&b->link);
 378                         tdm_buffer_unref_backend(b->buffer);
 379                         free(b);
 380                 }
 381                 _pthread_mutex_lock(&private_display->lock);
 382         }
 383
 384         private_capture->stamp = 0;
 385         free(private_capture);
 386 }
 387
 388 EXTERN void
 389 tdm_capture_destroy(tdm_capture *capture)
 390 {
 391         tdm_private_capture *private_capture = capture;
 392         tdm_private_display *private_display;
 393
 394         if (!private_capture)
 395                 return;
 396
 397         TDM_DBG("capture(%p) destroy", private_capture);
 398
 399         private_display = private_capture->private_display;
 400
 401         _pthread_mutex_lock(&private_display->lock);
 402         tdm_capture_destroy_internal(private_capture);
 403         _pthread_mutex_unlock(&private_display->lock);
 404 }
 405
 406 EXTERN tdm_error
 407 tdm_capture_set_info(tdm_capture *capture, tdm_info_capture *info)
 408 {
 409         CAPTURE_FUNC_ENTRY();
 410
 411         TDM_RETURN_VAL_IF_FAIL(info != NULL, TDM_ERROR_INVALID_PARAMETER);
 412         TDM_RETURN_VAL_IF_FAIL(info->type != 0, TDM_ERROR_INVALID_PARAMETER);
 413
 414         _pthread_mutex_lock(&private_display->lock);
 415
 416         if (!func_capture->capture_set_info) {
 417                 _pthread_mutex_unlock(&private_display->lock);
 418                 TDM_DBG("failed: not implemented!!");
 419                 return TDM_ERROR_NOT_IMPLEMENTED;
 420         }
 421
 422         if (info->type == TDM_CAPTURE_TYPE_STREAM && info->frequency == 0) {
 423                 tdm_private_output *private_output = private_capture->private_output;
 424                 info->frequency = private_output->current_mode->vrefresh;
 425         }
 426
 427         TDM_INFO("capture(%p) info: dst(%dx%d %d,%d %dx%d %c%c%c%c) trans(%d) type(%d) freq(%d) flags(%x)",
 428                          private_capture,
 429                          info->dst_config.size.h, info->dst_config.size.v,
 430                          info->dst_config.pos.x, info->dst_config.pos.y,
 431                          info->dst_config.pos.w, info->dst_config.pos.h,
 432                          FOURCC_STR(info->dst_config.format),
 433                          info->transform, info->type, info->frequency, info->flags);
 434
 435         ret = func_capture->capture_set_info(private_capture->capture_backend, info);
 436         TDM_WARNING_IF_FAIL(ret == TDM_ERROR_NONE);
 437
 438         private_capture->info = *info;
 439
 440         _pthread_mutex_unlock(&private_display->lock);
 441
 442         return ret;
 443 }
 444
 445 EXTERN tdm_error
 446 tdm_capture_set_done_handler(tdm_capture *capture, tdm_capture_done_handler func, void *user_data)
 447 {
 448         tdm_private_display *private_display;
 449         tdm_private_capture *private_capture;
 450         tdm_error ret = TDM_ERROR_NONE;
 451
 452         TDM_RETURN_VAL_IF_FAIL(capture != NULL, TDM_ERROR_INVALID_PARAMETER);
 453
 454         private_capture = (tdm_private_capture*)capture;
 455         private_display = private_capture->private_display;
 456
 457         TDM_RETURN_VAL_IF_FAIL(func != NULL, TDM_ERROR_INVALID_PARAMETER);
 458
 459         _pthread_mutex_lock(&private_display->lock);
 460
 461         private_capture->done_func = func;
 462         private_capture->done_user_data = user_data;
 463
 464         _pthread_mutex_unlock(&private_display->lock);
 465
 466         return ret;
 467 }
 468
 469 EXTERN tdm_error
 470 tdm_capture_attach(tdm_capture *capture, tbm_surface_h buffer)
 471 {
 472         tdm_capture_private_buffer *capture_buffer;
 473
 474         CAPTURE_FUNC_ENTRY();
 475
 476         TDM_RETURN_VAL_IF_FAIL(buffer != NULL, TDM_ERROR_INVALID_PARAMETER);
 477
 478         _pthread_mutex_lock(&private_display->lock);
 479
 480         if (!func_capture->capture_attach) {
 481                 _pthread_mutex_unlock(&private_display->lock);
 482                 TDM_DBG("failed: not implemented!!");
 483                 return TDM_ERROR_NOT_IMPLEMENTED;
 484         }
 485
 486         if (tdm_display_check_module_abi(private_display, 1, 2) &&
 487                 private_display->caps_capture.max_attach_count > 0) {
 488                 int length = LIST_LENGTH(&private_capture->pending_buffer_list) +
 489                                          LIST_LENGTH(&private_capture->buffer_list);
 490                 if (length >= private_display->caps_capture.max_attach_count) {
 491                         _pthread_mutex_unlock(&private_display->lock);
 492                         TDM_DBG("failed: too many attached!! max_attach_count(%d)",
 493                                         private_display->caps_capture.max_attach_count);
 494                         return TDM_ERROR_BAD_REQUEST;
 495                 }
 496         }
 497
 498         capture_buffer = calloc(1, sizeof * capture_buffer);
 499         if (!capture_buffer) {
 500                 _pthread_mutex_unlock(&private_display->lock);
 501                 TDM_ERR("alloc failed");
 502                 return TDM_ERROR_OUT_OF_MEMORY;
 503         }
 504
 505         ret = func_capture->capture_attach(private_capture->capture_backend, buffer);
 506         TDM_WARNING_IF_FAIL(ret == TDM_ERROR_NONE);
 507
 508         if (ret != TDM_ERROR_NONE) {
 509                 free(capture_buffer);
 510                 _pthread_mutex_unlock(&private_display->lock);
 511                 TDM_ERR("attach failed");
 512                 return ret;
 513         }
 514
 515         LIST_ADDTAIL(&capture_buffer->link, &private_capture->pending_buffer_list);
 516         capture_buffer->buffer = tdm_buffer_ref_backend(buffer);
 517
 518         if (tdm_debug_module & TDM_DEBUG_BUFFER) {
 519                 TDM_INFO("capture(%p) attached:", private_capture);
 520                 tdm_buffer_list_dump(&private_capture->buffer_list);
 521         }
 522
 523         _pthread_mutex_unlock(&private_display->lock);
 524
 525         return ret;
 526 }
 527
 528 EXTERN tdm_error
 529 tdm_capture_commit(tdm_capture *capture)
 530 {
 531         tdm_capture_private_buffer *b = NULL, *bb = NULL;
 532         tdm_private_output *private_output;
 533         struct list_head commit_buffer_list;
 534
 535         CAPTURE_FUNC_ENTRY();
 536
 537         _pthread_mutex_lock(&private_display->lock);
 538
 539         private_output = private_capture->private_output;
 540         if (private_output->current_dpms_value > TDM_OUTPUT_DPMS_ON) {
 541                 TDM_ERR("output(%d) dpms: %s", private_output->pipe,
 542                                 tdm_dpms_str(private_output->current_dpms_value));
 543                 _pthread_mutex_unlock(&private_display->lock);
 544                 return TDM_ERROR_BAD_REQUEST;
 545         }
 546
 547         if (!func_capture->capture_commit) {
 548                 _pthread_mutex_unlock(&private_display->lock);
 549                 TDM_DBG("failed: not implemented!!");
 550                 return TDM_ERROR_NOT_IMPLEMENTED;
 551         }
 552
 553         LIST_INITHEAD(&commit_buffer_list);
 554
 555         LIST_FOR_EACH_ENTRY_SAFE(b, bb, &private_capture->pending_buffer_list, link) {
 556                 LIST_DEL(&b->link);
 557                 LIST_ADDTAIL(&b->link, &private_capture->buffer_list);
 558                 LIST_ADDTAIL(&b->commit_link, &commit_buffer_list);
 559         }
 560
 561         ret = func_capture->capture_commit(private_capture->capture_backend);
 562         TDM_WARNING_IF_FAIL(ret == TDM_ERROR_NONE);
 563
 564         LIST_FOR_EACH_ENTRY_SAFE(b, bb, &commit_buffer_list, commit_link) {
 565                 LIST_DELINIT(&b->commit_link);
 566
 567                 if (!_tdm_capture_find_buffer(&private_capture->buffer_list, b))
 568                         continue;
 569
 570                 if (ret != TDM_ERROR_NONE) {
 571                         /* Not to call the user release handler when failed.
 572                          * Do we have to call this function here really?
 573                          * User better use set_done_handler to know when pp is done. Using
 574                          * buffer_release_handler is not good.
 575                          */
 576                         tdm_buffer_remove_release_handler_internal(b->buffer);
 577
 578                         _pthread_mutex_unlock(&private_display->lock);
 579                         tdm_buffer_unref_backend(b->buffer);
 580                         _pthread_mutex_lock(&private_display->lock);
 581                         LIST_DEL(&b->link);
 582
 583                         free(b);
 584                 }
 585         }
 586
 587         _pthread_mutex_unlock(&private_display->lock);
 588
 589         return ret;
 590 }