FFmpeg
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split.c
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1 /*
2  * Copyright (c) 2007 Bobby Bingham
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * audio and video splitter
24  */
25 
26 #include <stdio.h>
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/mem.h"
31 #include "libavutil/opt.h"
32 
33 #include "avfilter.h"
34 #include "audio.h"
35 #include "internal.h"
36 #include "video.h"
37 
38 typedef struct SplitContext {
39  const AVClass *class;
41 } SplitContext;
42 
44 {
45  SplitContext *s = ctx->priv;
46  int i;
47 
48  for (i = 0; i < s->nb_outputs; i++) {
49  char name[32];
50  AVFilterPad pad = { 0 };
51 
52  snprintf(name, sizeof(name), "output%d", i);
53  pad.type = ctx->filter->inputs[0].type;
54  pad.name = av_strdup(name);
55 
56  ff_insert_outpad(ctx, i, &pad);
57  }
58 
59  return 0;
60 }
61 
63 {
64  int i;
65 
66  for (i = 0; i < ctx->nb_outputs; i++)
67  av_freep(&ctx->output_pads[i].name);
68 }
69 
70 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
71 {
72  AVFilterContext *ctx = inlink->dst;
73  int i, ret = AVERROR_EOF;
74 
75  for (i = 0; i < ctx->nb_outputs; i++) {
76  AVFrame *buf_out;
77 
78  if (ctx->outputs[i]->closed)
79  continue;
80  buf_out = av_frame_clone(frame);
81  if (!buf_out) {
82  ret = AVERROR(ENOMEM);
83  break;
84  }
85 
86  ret = ff_filter_frame(ctx->outputs[i], buf_out);
87  if (ret < 0)
88  break;
89  }
90  av_frame_free(&frame);
91  return ret;
92 }
93 
94 #define OFFSET(x) offsetof(SplitContext, x)
95 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
96 static const AVOption options[] = {
97  { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
98  { NULL }
99 };
100 
101 #define split_options options
103 
104 #define asplit_options options
105 AVFILTER_DEFINE_CLASS(asplit);
106 
108  {
109  .name = "default",
110  .type = AVMEDIA_TYPE_VIDEO,
111  .filter_frame = filter_frame,
112  },
113  { NULL }
114 };
115 
117  .name = "split",
118  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
119  .priv_size = sizeof(SplitContext),
120  .priv_class = &split_class,
121  .init = split_init,
122  .uninit = split_uninit,
123  .inputs = avfilter_vf_split_inputs,
124  .outputs = NULL,
126 };
127 
129  {
130  .name = "default",
131  .type = AVMEDIA_TYPE_AUDIO,
132  .filter_frame = filter_frame,
133  },
134  { NULL }
135 };
136 
138  .name = "asplit",
139  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
140  .priv_size = sizeof(SplitContext),
141  .priv_class = &asplit_class,
142  .init = split_init,
143  .uninit = split_uninit,
144  .inputs = avfilter_af_asplit_inputs,
145  .outputs = NULL,
147 };