ffmpeg/libavfilter/split.c

   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;
  40     int nb_outputs;
  41 } SplitContext;
  42
  43 static av_cold int split_init(AVFilterContext *ctx)
  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         if (!pad.name)
  56             return AVERROR(ENOMEM);
  57
  58         ff_insert_outpad(ctx, i, &pad);
  59     }
  60
  61     return 0;
  62 }
  63
  64 static av_cold void split_uninit(AVFilterContext *ctx)
  65 {
  66     int i;
  67
  68     for (i = 0; i < ctx->nb_outputs; i++)
  69         av_freep(&ctx->output_pads[i].name);
  70 }
  71
  72 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
  73 {
  74     AVFilterContext *ctx = inlink->dst;
  75     int i, ret = AVERROR_EOF;
  76
  77     for (i = 0; i < ctx->nb_outputs; i++) {
  78         AVFrame *buf_out;
  79
  80         if (ctx->outputs[i]->closed)
  81             continue;
  82         buf_out = av_frame_clone(frame);
  83         if (!buf_out) {
  84             ret = AVERROR(ENOMEM);
  85             break;
  86         }
  87
  88         ret = ff_filter_frame(ctx->outputs[i], buf_out);
  89         if (ret < 0)
  90             break;
  91     }
  92     av_frame_free(&frame);
  93     return ret;
  94 }
  95
  96 #define OFFSET(x) offsetof(SplitContext, x)
  97 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
  98 static const AVOption options[] = {
  99     { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
 100     { NULL }
 101 };
 102
 103 #define split_options options
 104 AVFILTER_DEFINE_CLASS(split);
 105
 106 #define asplit_options options
 107 AVFILTER_DEFINE_CLASS(asplit);
 108
 109 static const AVFilterPad avfilter_vf_split_inputs[] = {
 110     {
 111         .name         = "default",
 112         .type         = AVMEDIA_TYPE_VIDEO,
 113         .filter_frame = filter_frame,
 114     },
 115     { NULL }
 116 };
 117
 118 AVFilter ff_vf_split = {
 119     .name        = "split",
 120     .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
 121     .priv_size   = sizeof(SplitContext),
 122     .priv_class  = &split_class,
 123     .init        = split_init,
 124     .uninit      = split_uninit,
 125     .inputs      = avfilter_vf_split_inputs,
 126     .outputs     = NULL,
 127     .flags       = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 128 };
 129
 130 static const AVFilterPad avfilter_af_asplit_inputs[] = {
 131     {
 132         .name         = "default",
 133         .type         = AVMEDIA_TYPE_AUDIO,
 134         .filter_frame = filter_frame,
 135     },
 136     { NULL }
 137 };
 138
 139 AVFilter ff_af_asplit = {
 140     .name        = "asplit",
 141     .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
 142     .priv_size   = sizeof(SplitContext),
 143     .priv_class  = &asplit_class,
 144     .init        = split_init,
 145     .uninit      = split_uninit,
 146     .inputs      = avfilter_af_asplit_inputs,
 147     .outputs     = NULL,
 148     .flags       = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 149 };