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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;
  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. };
  150.