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