ref: 3b14f94924987fc66302bb8b803ad9065816f93e
dir: dav1d/src/thread_task.c
/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Two Orioles, LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "src/thread_task.h"
void *dav1d_frame_task(void *const data) {
Dav1dFrameContext *const f = data;
dav1d_set_thread_name("dav1d-frame");
pthread_mutex_lock(&f->frame_thread.td.lock);
for (;;) {
while (!f->n_tile_data && !f->frame_thread.die) {
pthread_cond_wait(&f->frame_thread.td.cond,
&f->frame_thread.td.lock);
}
if (f->frame_thread.die) break;
pthread_mutex_unlock(&f->frame_thread.td.lock);
if (dav1d_decode_frame(f))
memset(f->frame_thread.cf, 0,
(size_t)f->frame_thread.cf_sz * 128 * 128 / 2);
pthread_mutex_lock(&f->frame_thread.td.lock);
f->n_tile_data = 0;
pthread_cond_signal(&f->frame_thread.td.cond);
}
pthread_mutex_unlock(&f->frame_thread.td.lock);
return NULL;
}
void *dav1d_tile_task(void *const data) {
Dav1dTileContext *const t = data;
struct FrameTileThreadData *const fttd = t->tile_thread.fttd;
const Dav1dFrameContext *const f = t->f;
const int tile_thread_idx = (int) (t - f->tc);
const uint64_t mask = 1ULL << tile_thread_idx;
dav1d_set_thread_name("dav1d-tile");
for (;;) {
pthread_mutex_lock(&fttd->lock);
fttd->available |= mask;
int did_signal = 0;
while (!fttd->tasks_left && !t->tile_thread.die) {
if (!did_signal) {
did_signal = 1;
pthread_cond_signal(&fttd->icond);
}
pthread_cond_wait(&fttd->cond, &fttd->lock);
}
if (t->tile_thread.die) {
pthread_cond_signal(&fttd->icond);
pthread_mutex_unlock(&fttd->lock);
break;
}
fttd->available &= ~mask;
const int task_idx = fttd->num_tasks - fttd->tasks_left--;
pthread_mutex_unlock(&fttd->lock);
if (f->frame_thread.pass == 1 || f->n_tc >= f->frame_hdr->tiling.cols) {
// we can (or in fact, if >, we need to) do full tile decoding.
// loopfilter happens in the main thread
Dav1dTileState *const ts = t->ts = &f->ts[task_idx];
for (t->by = ts->tiling.row_start; t->by < ts->tiling.row_end;
t->by += f->sb_step)
{
const int error = dav1d_decode_tile_sbrow(t);
const int progress = error ? TILE_ERROR : 1 + (t->by >> f->sb_shift);
// signal progress
pthread_mutex_lock(&ts->tile_thread.lock);
atomic_store(&ts->progress, progress);
pthread_cond_signal(&ts->tile_thread.cond);
pthread_mutex_unlock(&ts->tile_thread.lock);
if (error) break;
}
} else {
const int sby = f->tile_thread.task_idx_to_sby_and_tile_idx[task_idx][0];
const int tile_idx = f->tile_thread.task_idx_to_sby_and_tile_idx[task_idx][1];
Dav1dTileState *const ts = &f->ts[tile_idx];
int progress;
// the interleaved decoding can sometimes cause dependency issues
// if one part of the frame decodes signifcantly faster than others.
// Ideally, we'd "skip" tile_sbrows where dependencies are missing,
// and resume them later as dependencies are met. This also would
// solve the broadcast() below and allow us to use signal(). However,
// for now, we use linear dependency tracking because it's simpler.
if ((progress = atomic_load(&ts->progress)) < sby) {
pthread_mutex_lock(&ts->tile_thread.lock);
while ((progress = atomic_load(&ts->progress)) < sby)
pthread_cond_wait(&ts->tile_thread.cond,
&ts->tile_thread.lock);
pthread_mutex_unlock(&ts->tile_thread.lock);
}
if (progress == TILE_ERROR) continue;
// we need to interleave sbrow decoding for all tile cols in a
// tile row, since otherwise subsequent threads will be blocked
// waiting for the post-filter to complete
t->ts = ts;
t->by = sby << f->sb_shift;
const int error = dav1d_decode_tile_sbrow(t);
progress = error ? TILE_ERROR : 1 + sby;
// signal progress
pthread_mutex_lock(&ts->tile_thread.lock);
atomic_store(&ts->progress, progress);
pthread_cond_broadcast(&ts->tile_thread.cond);
pthread_mutex_unlock(&ts->tile_thread.lock);
}
}
return NULL;
}