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- /*
- * Copyright (c) 2007 Bobby Bingham
- *
- * 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
- */
- /**
- * @file
- * FIFO buffering video filter
- */
- #include "avfilter.h"
- #include "video.h"
- typedef struct BufPic {
- AVFilterBufferRef *picref;
- struct BufPic *next;
- } BufPic;
- typedef struct {
- BufPic root;
- BufPic *last; ///< last buffered picture
- } FifoContext;
- static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
- {
- FifoContext *fifo = ctx->priv;
- fifo->last = &fifo->root;
- av_log(ctx, AV_LOG_INFO, "\n");
- return 0;
- }
- static av_cold void uninit(AVFilterContext *ctx)
- {
- FifoContext *fifo = ctx->priv;
- BufPic *pic, *tmp;
- for (pic = fifo->root.next; pic; pic = tmp) {
- tmp = pic->next;
- avfilter_unref_buffer(pic->picref);
- av_free(pic);
- }
- }
- static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
- {
- FifoContext *fifo = inlink->dst->priv;
- fifo->last->next = av_mallocz(sizeof(BufPic));
- fifo->last = fifo->last->next;
- fifo->last->picref = picref;
- }
- static void end_frame(AVFilterLink *inlink) { }
- static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
- static int request_frame(AVFilterLink *outlink)
- {
- FifoContext *fifo = outlink->src->priv;
- BufPic *tmp;
- int ret;
- if (!fifo->root.next) {
- if ((ret = avfilter_request_frame(outlink->src->inputs[0])) < 0)
- return ret;
- }
- /* by doing this, we give ownership of the reference to the next filter,
- * so we don't have to worry about dereferencing it ourselves. */
- avfilter_start_frame(outlink, fifo->root.next->picref);
- avfilter_draw_slice (outlink, 0, outlink->h, 1);
- avfilter_end_frame (outlink);
- if (fifo->last == fifo->root.next)
- fifo->last = &fifo->root;
- tmp = fifo->root.next->next;
- av_free(fifo->root.next);
- fifo->root.next = tmp;
- return 0;
- }
- AVFilter avfilter_vf_fifo = {
- .name = "fifo",
- .description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."),
- .init = init,
- .uninit = uninit,
- .priv_size = sizeof(FifoContext),
- .inputs = (const AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .get_video_buffer= ff_null_get_video_buffer,
- .start_frame = start_frame,
- .draw_slice = draw_slice,
- .end_frame = end_frame,
- .rej_perms = AV_PERM_REUSE2, },
- { .name = NULL}},
- .outputs = (const AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .request_frame = request_frame, },
- { .name = NULL}},
- };
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