mirror of https://code.videolan.org/videolan/dav1d
148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
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* Copyright © 2019, VideoLAN and dav1d authors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <SDL.h>
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#include <assert.h>
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#include "dp_fifo.h"
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// FIFO structure
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struct dp_fifo
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{
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SDL_mutex *lock;
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SDL_cond *cond_change;
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size_t capacity;
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size_t count;
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void **entries;
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int push_wait;
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int flush;
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};
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Dav1dPlayPtrFifo *dp_fifo_create(size_t capacity)
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{
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Dav1dPlayPtrFifo *fifo;
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assert(capacity > 0);
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if (capacity <= 0)
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return NULL;
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fifo = malloc(sizeof(*fifo));
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if (fifo == NULL)
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return NULL;
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fifo->capacity = capacity;
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fifo->count = 0;
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fifo->push_wait = 0;
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fifo->flush = 0;
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fifo->lock = SDL_CreateMutex();
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if (fifo->lock == NULL) {
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free(fifo);
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return NULL;
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}
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fifo->cond_change = SDL_CreateCond();
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if (fifo->cond_change == NULL) {
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SDL_DestroyMutex(fifo->lock);
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free(fifo);
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return NULL;
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}
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fifo->entries = calloc(capacity, sizeof(void*));
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if (fifo->entries == NULL) {
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dp_fifo_destroy(fifo);
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return NULL;
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}
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return fifo;
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}
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// Destroy FIFO
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void dp_fifo_destroy(Dav1dPlayPtrFifo *fifo)
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{
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assert(fifo->count == 0);
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SDL_DestroyMutex(fifo->lock);
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SDL_DestroyCond(fifo->cond_change);
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free(fifo->entries);
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free(fifo);
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}
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// Push to FIFO
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void dp_fifo_push(Dav1dPlayPtrFifo *fifo, void *element)
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{
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SDL_LockMutex(fifo->lock);
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while (fifo->count == fifo->capacity) {
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fifo->push_wait = 1;
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SDL_CondWait(fifo->cond_change, fifo->lock);
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fifo->push_wait = 0;
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if (fifo->flush) {
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SDL_CondSignal(fifo->cond_change);
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SDL_UnlockMutex(fifo->lock);
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return;
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}
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}
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fifo->entries[fifo->count++] = element;
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if (fifo->count == 1)
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SDL_CondSignal(fifo->cond_change);
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SDL_UnlockMutex(fifo->lock);
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}
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// Helper that shifts the FIFO array
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static void *dp_fifo_array_shift(void **arr, size_t len)
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{
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void *shifted_element = arr[0];
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for (size_t i = 1; i < len; ++i)
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arr[i-1] = arr[i];
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return shifted_element;
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}
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// Get item from FIFO
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void *dp_fifo_shift(Dav1dPlayPtrFifo *fifo)
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{
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SDL_LockMutex(fifo->lock);
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while (fifo->count == 0)
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SDL_CondWait(fifo->cond_change, fifo->lock);
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void *res = dp_fifo_array_shift(fifo->entries, fifo->count--);
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if (fifo->count == fifo->capacity - 1)
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SDL_CondSignal(fifo->cond_change);
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SDL_UnlockMutex(fifo->lock);
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return res;
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}
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void dp_fifo_flush(Dav1dPlayPtrFifo *fifo, void (*destroy_elem)(void *))
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{
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SDL_LockMutex(fifo->lock);
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fifo->flush = 1;
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if (fifo->push_wait) {
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SDL_CondSignal(fifo->cond_change);
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SDL_CondWait(fifo->cond_change, fifo->lock);
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}
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while (fifo->count)
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destroy_elem(fifo->entries[--fifo->count]);
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fifo->flush = 0;
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SDL_UnlockMutex(fifo->lock);
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}
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