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dualinput.c
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1 /*
2  * This file is part of FFmpeg.
3  *
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.
8  *
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.
13  *
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
17  */
18 
19 #include "dualinput.h"
20 #include "libavutil/timestamp.h"
21 
22 static int process_frame(FFFrameSync *fs)
23 {
24  AVFilterContext *ctx = fs->parent;
26  AVFrame *mainpic = NULL, *secondpic = NULL;
27  int ret = 0;
28 
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);
32  return ret;
33  }
34  av_assert0(mainpic);
35  mainpic->pts = av_rescale_q(mainpic->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));
40  return ret;
41 }
42 
44 {
45  FFFrameSyncIn *in = s->fs.in;
46 
47  ff_framesync_init(&s->fs, ctx, 2);
48  s->fs.opaque = s;
50  in[0].time_base = ctx->inputs[0]->time_base;
51  in[1].time_base = ctx->inputs[1]->time_base;
52  in[0].sync = 2;
53  in[0].before = EXT_STOP;
54  in[0].after = EXT_INFINITY;
55  in[1].sync = 1;
56  in[1].before = EXT_NULL;
57  in[1].after = EXT_INFINITY;
58 
59  if (s->shortest)
60  in[0].after = in[1].after = EXT_STOP;
61  if (!s->repeatlast) {
62  in[1].after = EXT_NULL;
63  in[1].sync = 0;
64  }
65 
66  return ff_framesync_configure(&s->fs);
67 }
68 
70  AVFilterLink *inlink, AVFrame *in)
71 {
72  return ff_framesync_filter_frame(&s->fs, inlink, in);
73 }
74 
76 {
77  return ff_framesync_request_frame(&s->fs, outlink);
78 }
79 
81 {
83 }