libavfilter/split.c

   1 /*
   2  * Copyright (c) 2007 Bobby Bingham
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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/internal.h"
  29 #include "libavutil/mem.h"
  30 #include "avfilter.h"
  31 #include "audio.h"
  32 #include "internal.h"
  33 #include "video.h"
  34
  35 static int split_init(AVFilterContext *ctx, const char *args)
  36 {
  37     int i, nb_outputs = 2;
  38
  39     if (args) {
  40         nb_outputs = strtol(args, NULL, 0);
  41         if (nb_outputs <= 0) {
  42             av_log(ctx, AV_LOG_ERROR, "Invalid number of outputs specified: %d.\n",
  43                    nb_outputs);
  44             return AVERROR(EINVAL);
  45         }
  46     }
  47
  48     for (i = 0; i < 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
  62 static void split_uninit(AVFilterContext *ctx)
  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 = 0;
  74
  75     for (i = 0; i < ctx->nb_outputs; i++) {
  76         AVFrame *buf_out = av_frame_clone(frame);
  77         if (!buf_out) {
  78             ret = AVERROR(ENOMEM);
  79             break;
  80         }
  81
  82         ret = ff_filter_frame(ctx->outputs[i], buf_out);
  83         if (ret < 0)
  84             break;
  85     }
  86     av_frame_free(&frame);
  87     return ret;
  88 }
  89
  90 static const AVFilterPad avfilter_vf_split_inputs[] = {
  91     {
  92         .name             = "default",
  93         .type             = AVMEDIA_TYPE_VIDEO,
  94         .get_video_buffer = ff_null_get_video_buffer,
  95         .filter_frame     = filter_frame,
  96     },
  97     { NULL }
  98 };
  99
 100 AVFilter avfilter_vf_split = {
 101     .name      = "split",
 102     .description = NULL_IF_CONFIG_SMALL("Pass on the input to two outputs."),
 103
 104     .init   = split_init,
 105     .uninit = split_uninit,
 106
 107     .inputs    = avfilter_vf_split_inputs,
 108     .outputs   = NULL,
 109 };
 110
 111 static const AVFilterPad avfilter_af_asplit_inputs[] = {
 112     {
 113         .name             = "default",
 114         .type             = AVMEDIA_TYPE_AUDIO,
 115         .get_audio_buffer = ff_null_get_audio_buffer,
 116         .filter_frame     = filter_frame,
 117     },
 118     { NULL }
 119 };
 120
 121 AVFilter avfilter_af_asplit = {
 122     .name        = "asplit",
 123     .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
 124
 125     .init   = split_init,
 126     .uninit = split_uninit,
 127
 128     .inputs  = avfilter_af_asplit_inputs,
 129     .outputs = NULL,
 130 };