mirror of https://git.ffmpeg.org/ffmpeg.git
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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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
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* License 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 GNU
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* 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
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* buffer sink
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*/
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#include "libavutil/fifo.h"
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#include "avfilter.h"
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#include "buffersink.h"
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typedef struct {
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AVFifoBuffer *fifo; ///< FIFO buffer of video frame references
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} BufferSinkContext;
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#define FIFO_INIT_SIZE 8
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BufferSinkContext *sink = ctx->priv;
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while (sink->fifo && av_fifo_size(sink->fifo)) {
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AVFilterBufferRef *buf;
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av_fifo_generic_read(sink->fifo, &buf, sizeof(buf), NULL);
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avfilter_unref_buffer(buf);
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}
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av_fifo_free(sink->fifo);
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}
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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BufferSinkContext *sink = ctx->priv;
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if (!(sink->fifo = av_fifo_alloc(FIFO_INIT_SIZE*sizeof(AVFilterBufferRef*)))) {
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av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static void end_frame(AVFilterLink *link)
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{
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AVFilterContext *ctx = link->dst;
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BufferSinkContext *sink = ctx->priv;
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if (av_fifo_space(sink->fifo) < sizeof(AVFilterBufferRef *) &&
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(av_fifo_realloc2(sink->fifo, av_fifo_size(sink->fifo) * 2) < 0)) {
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av_log(ctx, AV_LOG_ERROR, "Error reallocating the FIFO.\n");
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return;
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}
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av_fifo_generic_write(sink->fifo, &link->cur_buf, sizeof(link->cur_buf), NULL);
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link->cur_buf = NULL;
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}
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int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
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{
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BufferSinkContext *sink = ctx->priv;
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AVFilterLink *link = ctx->inputs[0];
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int ret;
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if (!buf) {
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if (av_fifo_size(sink->fifo))
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return av_fifo_size(sink->fifo)/sizeof(*buf);
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else
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return avfilter_poll_frame(ctx->inputs[0]);
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}
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if (!av_fifo_size(sink->fifo) &&
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(ret = avfilter_request_frame(link)) < 0)
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return ret;
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if (!av_fifo_size(sink->fifo))
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return AVERROR(EINVAL);
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av_fifo_generic_read(sink->fifo, buf, sizeof(*buf), NULL);
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return 0;
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}
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AVFilter avfilter_vsink_buffer = {
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.name = "buffersink_old",
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.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
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.priv_size = sizeof(BufferSinkContext),
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.init = init,
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.uninit = uninit,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ, },
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{ .name = NULL }},
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.outputs = (AVFilterPad[]) {{ .name = NULL }},
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};
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