mirror of
https://github.com/FFmpeg/FFmpeg.git
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124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/*
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* Generic frame queue
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* Copyright (c) 2016 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avassert.h"
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#include "framequeue.h"
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static inline FFFrameBucket *bucket(FFFrameQueue *fq, size_t idx)
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{
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return &fq->queue[(fq->tail + idx) & (fq->allocated - 1)];
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}
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void ff_framequeue_global_init(FFFrameQueueGlobal *fqg)
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{
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}
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static void check_consistency(FFFrameQueue *fq)
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{
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#if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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uint64_t nb_samples = 0;
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size_t i;
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av_assert0(fq->queued == fq->total_frames_head - fq->total_frames_tail);
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for (i = 0; i < fq->queued; i++)
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nb_samples += bucket(fq, i)->frame->nb_samples;
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av_assert0(nb_samples == fq->total_samples_head - fq->total_samples_tail);
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#endif
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}
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void ff_framequeue_init(FFFrameQueue *fq, FFFrameQueueGlobal *fqg)
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{
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fq->queue = &fq->first_bucket;
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fq->allocated = 1;
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}
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void ff_framequeue_free(FFFrameQueue *fq)
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{
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while (fq->queued) {
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AVFrame *frame = ff_framequeue_take(fq);
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av_frame_free(&frame);
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}
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if (fq->queue != &fq->first_bucket)
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av_freep(&fq->queue);
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}
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int ff_framequeue_add(FFFrameQueue *fq, AVFrame *frame)
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{
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FFFrameBucket *b;
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check_consistency(fq);
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if (fq->queued == fq->allocated) {
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if (fq->allocated == 1) {
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size_t na = 8;
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FFFrameBucket *nq = av_realloc_array(NULL, na, sizeof(*nq));
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if (!nq)
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return AVERROR(ENOMEM);
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nq[0] = fq->queue[0];
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fq->queue = nq;
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fq->allocated = na;
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} else {
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size_t na = fq->allocated << 1;
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FFFrameBucket *nq = av_realloc_array(fq->queue, na, sizeof(*nq));
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if (!nq)
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return AVERROR(ENOMEM);
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if (fq->tail + fq->queued > fq->allocated)
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memmove(nq + fq->allocated, nq,
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(fq->tail + fq->queued - fq->allocated) * sizeof(*nq));
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fq->queue = nq;
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fq->allocated = na;
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}
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}
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b = bucket(fq, fq->queued);
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b->frame = frame;
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fq->queued++;
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fq->total_frames_head++;
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fq->total_samples_head += frame->nb_samples;
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check_consistency(fq);
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return 0;
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}
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AVFrame *ff_framequeue_take(FFFrameQueue *fq)
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{
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FFFrameBucket *b;
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check_consistency(fq);
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av_assert1(fq->queued);
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b = bucket(fq, 0);
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fq->queued--;
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fq->tail++;
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fq->tail &= fq->allocated - 1;
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fq->total_frames_tail++;
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fq->total_samples_tail += b->frame->nb_samples;
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check_consistency(fq);
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return b->frame;
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}
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AVFrame *ff_framequeue_peek(FFFrameQueue *fq, size_t idx)
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{
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FFFrameBucket *b;
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check_consistency(fq);
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av_assert1(idx < fq->queued);
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b = bucket(fq, idx);
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check_consistency(fq);
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return b->frame;
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}
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