3560089e12
Allow to cache more than one frame (e.g. for filters which return more than one frame when avfilter_request_frame() is called on them), and do not discard previously cached frames when a new one is added.
140 lines
4.2 KiB
C
140 lines
4.2 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 video 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 "vsink_buffer.h"
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typedef struct {
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AVFifoBuffer *fifo; ///< FIFO buffer of video frame references
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enum PixelFormat *pix_fmts; ///< accepted pixel formats, must be terminated with -1
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} BufferSinkContext;
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#define FIFO_INIT_SIZE 8
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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 *buf = ctx->priv;
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if (!opaque) {
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av_log(ctx, AV_LOG_ERROR, "No opaque field provided, which is required.\n");
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return AVERROR(EINVAL);
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}
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buf->fifo = av_fifo_alloc(FIFO_INIT_SIZE*sizeof(AVFilterBufferRef *));
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if (!buf->fifo) {
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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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buf->pix_fmts = opaque;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BufferSinkContext *buf = ctx->priv;
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AVFilterBufferRef *picref;
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if (buf->fifo) {
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while (av_fifo_size(buf->fifo) >= sizeof(AVFilterBufferRef *)) {
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av_fifo_generic_read(buf->fifo, &picref, sizeof(picref), NULL);
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avfilter_unref_buffer(picref);
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}
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av_fifo_free(buf->fifo);
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buf->fifo = NULL;
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}
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}
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static void end_frame(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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BufferSinkContext *buf = inlink->dst->priv;
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if (av_fifo_space(buf->fifo) < sizeof(AVFilterBufferRef *)) {
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/* realloc fifo size */
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if (av_fifo_realloc2(buf->fifo, av_fifo_size(buf->fifo) * 2) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Cannot buffer more frames. Consume some available frames "
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"before adding new ones.\n");
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return;
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}
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}
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/* cache frame */
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av_fifo_generic_write(buf->fifo,
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&inlink->cur_buf, sizeof(AVFilterBufferRef *), NULL);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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BufferSinkContext *buf = ctx->priv;
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(buf->pix_fmts));
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return 0;
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}
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int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *ctx,
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AVFilterBufferRef **picref, int flags)
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{
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BufferSinkContext *buf = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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int ret;
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*picref = NULL;
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/* no picref available, fetch it from the filterchain */
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if (!av_fifo_size(buf->fifo)) {
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if ((ret = avfilter_request_frame(inlink)) < 0)
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return ret;
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}
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if (!av_fifo_size(buf->fifo))
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return AVERROR(EINVAL);
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if (flags & AV_VSINK_BUF_FLAG_PEEK)
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*picref = (AVFilterBufferRef *)av_fifo_peek2(buf->fifo, 0);
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else
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av_fifo_generic_read(buf->fifo, picref, sizeof(*picref), NULL);
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return 0;
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}
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AVFilter avfilter_vsink_buffersink = {
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.name = "buffersink",
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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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.query_formats = query_formats,
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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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