2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include "dualinput.h"
20 #include "libavutil/timestamp.h"
22 static int process_frame(FFFrameSync *fs)
24 AVFilterContext *ctx = fs->parent;
25 FFDualInputContext *s = fs->opaque;
26 AVFrame *mainpic = NULL, *secondpic = NULL;
29 if ((ret = ff_framesync_get_frame(&s->fs, 0, &mainpic, 1)) < 0 ||
30 (ret = ff_framesync_get_frame(&s->fs, 1, &secondpic, 0)) < 0) {
31 av_frame_free(&mainpic);
35 mainpic->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[0]->time_base);
36 if (secondpic && !ctx->is_disabled)
37 mainpic = s->process(ctx, mainpic, secondpic);
38 ret = ff_filter_frame(ctx->outputs[0], mainpic);
39 av_assert1(ret != AVERROR(EAGAIN));
43 int ff_dualinput_init(AVFilterContext *ctx, FFDualInputContext *s)
48 if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
53 s->fs.on_event = process_frame;
54 in[0].time_base = ctx->inputs[0]->time_base;
55 in[1].time_base = ctx->inputs[1]->time_base;
57 in[0].before = EXT_STOP;
58 in[0].after = EXT_INFINITY;
60 in[1].before = EXT_NULL;
61 in[1].after = EXT_INFINITY;
64 in[0].after = in[1].after = EXT_STOP;
66 in[1].after = EXT_NULL;
69 if (s->skip_initial_unpaired) {
70 in[1].before = EXT_STOP;
73 return ff_framesync_configure(&s->fs);
76 int ff_dualinput_filter_frame(FFDualInputContext *s,
77 AVFilterLink *inlink, AVFrame *in)
79 return ff_framesync_filter_frame(&s->fs, inlink, in);
82 int ff_dualinput_request_frame(FFDualInputContext *s, AVFilterLink *outlink)
84 return ff_framesync_request_frame(&s->fs, outlink);
87 void ff_dualinput_uninit(FFDualInputContext *s)
89 ff_framesync_uninit(&s->fs);