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Diffstat (limited to 'ffmpeg1/libavfilter/bufferqueue.h')
| -rw-r--r-- | ffmpeg1/libavfilter/bufferqueue.h | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/ffmpeg1/libavfilter/bufferqueue.h b/ffmpeg1/libavfilter/bufferqueue.h deleted file mode 100644 index adbc0fd..0000000 --- a/ffmpeg1/libavfilter/bufferqueue.h +++ /dev/null @@ -1,121 +0,0 @@ -/* - * Generic buffer queue - * Copyright (c) 2012 Nicolas George - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#ifndef AVFILTER_BUFFERQUEUE_H -#define AVFILTER_BUFFERQUEUE_H - -/** - * FFBufQueue: simple AVFrame queue API - * - * Note: this API is not thread-safe. Concurrent access to the same queue - * must be protected by a mutex or any synchronization mechanism. - */ - -/** - * Maximum size of the queue. - * - * This value can be overridden by definying it before including this - * header. - * Powers of 2 are recommended. - */ -#ifndef FF_BUFQUEUE_SIZE -#define FF_BUFQUEUE_SIZE 32 -#endif - -#include "avfilter.h" -#include "libavutil/avassert.h" - -/** - * Structure holding the queue - */ -struct FFBufQueue { - AVFrame *queue[FF_BUFQUEUE_SIZE]; - unsigned short head; - unsigned short available; /**< number of available buffers */ -}; - -#define BUCKET(i) queue->queue[(queue->head + (i)) % FF_BUFQUEUE_SIZE] - -/** - * Test if a buffer queue is full. - */ -static inline int ff_bufqueue_is_full(struct FFBufQueue *queue) -{ - return queue->available == FF_BUFQUEUE_SIZE; -} - -/** - * Add a buffer to the queue. - * - * If the queue is already full, then the current last buffer is dropped - * (and unrefed) with a warning before adding the new buffer. - */ -static inline void ff_bufqueue_add(void *log, struct FFBufQueue *queue, - AVFrame *buf) -{ - if (ff_bufqueue_is_full(queue)) { - av_log(log, AV_LOG_WARNING, "Buffer queue overflow, dropping.\n"); - av_frame_free(&BUCKET(--queue->available)); - } - BUCKET(queue->available++) = buf; -} - -/** - * Get a buffer from the queue without altering it. - * - * Buffer with index 0 is the first buffer in the queue. - * Return NULL if the queue has not enough buffers. - */ -static inline AVFrame *ff_bufqueue_peek(struct FFBufQueue *queue, - unsigned index) -{ - return index < queue->available ? BUCKET(index) : NULL; -} - -/** - * Get the first buffer from the queue and remove it. - * - * Do not use on an empty queue. - */ -static inline AVFrame *ff_bufqueue_get(struct FFBufQueue *queue) -{ - AVFrame *ret = queue->queue[queue->head]; - av_assert0(queue->available); - queue->available--; - queue->queue[queue->head] = NULL; - queue->head = (queue->head + 1) % FF_BUFQUEUE_SIZE; - return ret; -} - -/** - * Unref and remove all buffers from the queue. - */ -static inline void ff_bufqueue_discard_all(struct FFBufQueue *queue) -{ - while (queue->available) { - AVFrame *buf = ff_bufqueue_get(queue); - av_frame_free(&buf); - } -} - -#undef BUCKET - -#endif /* AVFILTER_BUFFERQUEUE_H */ |
