sequencer_preview.cc

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "DNA_sequence_types.h"
#include "DNA_sound_types.h"
 
#include "BLI_listbase.h"
#include "BLI_task.h"
#include "BLI_threads.h"
 
#include "BKE_context.hh"
#include "BKE_global.hh"
#include "BKE_sound.h"
 
#include "WM_api.hh"
#include "WM_types.hh"
 
#include "ED_screen.hh"
 
#include "MEM_guardedalloc.h"
 
#include "sequencer_intern.hh"
 
namespace blender::ed::vse {
 
struct PreviewJob {
  ListBase previews;
  ThreadMutex *mutex;
  Scene *scene;
  int total;
  int processed;
  ThreadCondition preview_suspend_cond;
  bool running;
};
 
struct PreviewJobAudio {
  PreviewJobAudio *next, *prev;
  Main *bmain;
  bSound *sound;
  int lr; /* Sample left or right. */
  int startframe;
  bool waveform; /* Reload sound or waveform. */
};
 
struct ReadSoundWaveformTask {
  PreviewJob *wm_job;
  PreviewJobAudio *preview_job_audio;
  bool *stop;
};
 
static void free_preview_job(void *data)
{
  PreviewJob *pj = static_cast<PreviewJob *>(data);
 
  BLI_mutex_free(pj->mutex);
  BLI_freelistN(&pj->previews);
  MEM_freeN(pj);
}
 
static void clear_sound_waveform_loading_tag(bSound *sound)
{
  SpinLock *spinlock = static_cast<SpinLock *>(sound->spinlock);
  BLI_spin_lock(spinlock);
  sound->tags &= ~SOUND_TAGS_WAVEFORM_LOADING;
  BLI_spin_unlock(spinlock);
}
 
static void free_read_sound_waveform_task(TaskPool *__restrict task_pool, void *data)
{
  UNUSED_VARS(task_pool);
 
  ReadSoundWaveformTask *task = static_cast<ReadSoundWaveformTask *>(data);
 
  /* The job audio has already been removed from the list, now we just need to free it. */
  MEM_freeN(task->preview_job_audio);
 
  BLI_mutex_lock(task->wm_job->mutex);
  task->wm_job->processed++;
  BLI_mutex_unlock(task->wm_job->mutex);
 
  BLI_condition_notify_one(&task->wm_job->preview_suspend_cond);
 
  MEM_freeN(task);
}
 
static void execute_read_sound_waveform_task(TaskPool *__restrict task_pool, void *task_data)
{
  ReadSoundWaveformTask *task = static_cast<ReadSoundWaveformTask *>(task_data);
 
  if (BLI_task_pool_current_canceled(task_pool)) {
    clear_sound_waveform_loading_tag(task->preview_job_audio->sound);
    return;
  }
 
  PreviewJobAudio *audio_job = task->preview_job_audio;
  BKE_sound_read_waveform(audio_job->bmain, audio_job->sound, task->stop);
}
 
/* Only this runs inside thread. */
static void preview_startjob(void *data, wmJobWorkerStatus *worker_status)
{
  TaskPool *task_pool = BLI_task_pool_create(nullptr, TASK_PRIORITY_LOW);
  PreviewJob *pj = static_cast<PreviewJob *>(data);
 
  while (true) {
    /* Wait until there's either a new audio job to process or one of the previously submitted jobs
     * is done. */
    BLI_mutex_lock(pj->mutex);
 
    while (BLI_listbase_is_empty(&pj->previews) && pj->processed != pj->total) {
 
      float current_progress = (pj->total > 0) ? float(pj->processed) / float(pj->total) : 1.0f;
 
      if (current_progress != worker_status->progress) {
        worker_status->progress = current_progress;
        worker_status->do_update = true;
      }
 
      BLI_condition_wait(&pj->preview_suspend_cond, pj->mutex);
    }
 
    if (pj->processed == pj->total) {
      pj->running = false;
      BLI_mutex_unlock(pj->mutex);
      break;
    }
 
    if (worker_status->stop || G.is_break) {
      BLI_task_pool_cancel(task_pool);
 
      LISTBASE_FOREACH (PreviewJobAudio *, previewjb, &pj->previews) {
        clear_sound_waveform_loading_tag(previewjb->sound);
      }
 
      BLI_freelistN(&pj->previews);
      pj->processed = 0;
      pj->total = 0;
      pj->running = false;
 
      BLI_mutex_unlock(pj->mutex);
      break;
    }
 
    Vector<ReadSoundWaveformTask *> new_tasks;
    LISTBASE_FOREACH_MUTABLE (PreviewJobAudio *, previewjb, &pj->previews) {
      ReadSoundWaveformTask *task = MEM_callocN<ReadSoundWaveformTask>("read sound waveform task");
      task->wm_job = pj;
      task->preview_job_audio = previewjb;
      task->stop = &worker_status->stop;
      new_tasks.append(task);
 
      BLI_remlink(&pj->previews, previewjb);
    }
 
    BLI_mutex_unlock(pj->mutex);
 
    for (ReadSoundWaveformTask *task : new_tasks) {
      BLI_task_pool_push(
          task_pool, execute_read_sound_waveform_task, task, true, free_read_sound_waveform_task);
    }
  }
 
  BLI_task_pool_work_and_wait(task_pool);
  BLI_task_pool_free(task_pool);
}
 
static void preview_endjob(void *data)
{
  PreviewJob *pj = static_cast<PreviewJob *>(data);
 
  WM_main_add_notifier(NC_SCENE | ND_SEQUENCER, pj->scene);
}
 
void sequencer_preview_add_sound(const bContext *C, const Strip *strip)
{
  wmJob *wm_job;
  PreviewJob *pj;
  ScrArea *area = CTX_wm_area(C);
 
  wm_job = WM_jobs_get(CTX_wm_manager(C),
                       CTX_wm_window(C),
                       CTX_data_sequencer_scene(C),
                       "Generating strip previews...",
                       WM_JOB_PROGRESS,
                       WM_JOB_TYPE_SEQ_BUILD_PREVIEW);
 
  /* Get the preview job if it exists. */
  pj = static_cast<PreviewJob *>(WM_jobs_customdata_get(wm_job));
 
  if (pj) {
    BLI_mutex_lock(pj->mutex);
 
    /* If the job exists but is not running, bail and try again on the next draw call. */
    if (!pj->running) {
      BLI_mutex_unlock(pj->mutex);
 
      /* Clear the sound loading tag to that it can be reattempted. */
      clear_sound_waveform_loading_tag(strip->sound);
      WM_event_add_notifier(C, NC_SCENE | ND_SPACE_SEQUENCER, CTX_data_sequencer_scene(C));
      return;
    }
  }
  else { /* There's no existing preview job. */
    pj = MEM_callocN<PreviewJob>("preview rebuild job");
 
    pj->mutex = BLI_mutex_alloc();
    BLI_condition_init(&pj->preview_suspend_cond);
    pj->scene = CTX_data_sequencer_scene(C);
    pj->running = true;
    BLI_mutex_lock(pj->mutex);
 
    WM_jobs_customdata_set(wm_job, pj, free_preview_job);
    WM_jobs_timer(wm_job, 0.1, NC_SCENE | ND_SEQUENCER, NC_SCENE | ND_SEQUENCER);
    WM_jobs_callbacks(wm_job, preview_startjob, nullptr, nullptr, preview_endjob);
  }
 
  PreviewJobAudio *audiojob = MEM_callocN<PreviewJobAudio>("preview_audio");
  audiojob->bmain = CTX_data_main(C);
  audiojob->sound = strip->sound;
 
  BLI_addtail(&pj->previews, audiojob);
  pj->total++;
  BLI_mutex_unlock(pj->mutex);
 
  BLI_condition_notify_one(&pj->preview_suspend_cond);
 
  if (!WM_jobs_is_running(wm_job)) {
    G.is_break = false;
    WM_jobs_start(CTX_wm_manager(C), wm_job);
  }
 
  ED_area_tag_redraw(area);
}
 
}  // namespace blender::ed::vse