aboutsummaryrefslogblamecommitdiffstats
path: root/libavfilter/split.c
blob: 30cc3e5c000784fe550f2055e2668bf9a9cf9ca7 (plain) (tree)
1
2
  
                                   
















                                                                               
        
                           
   


                               
                     
                  
                     
                  
 
                                                             















                                                                                   
                                               
                                   
                                      
 
                                       







                                              
                                         

                                            
                                                                       
 
                                       
                             
 
                                           



                                                              


                                                       


                    
 
                                                                        
 
                                       
                             
 
                                           
                                    



                                                              
 
                                          
 
                                       
                             
 
                                           
                                    



                                            
 










                                                       
                              
                         
                                                                                 
 

                           
                                          
                      
  
 
                                                                              
                                       
                   
 
                                           






                                                                         

                    
                                      
               
 








                                                        
                               
                            



                                                                                       
                                         
                    
  
/*
 * Copyright (c) 2007 Bobby Bingham
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * audio and video splitter
 */

#include <stdio.h>

#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "avfilter.h"
#include "audio.h"
#include "internal.h"
#include "video.h"

static int split_init(AVFilterContext *ctx, const char *args)
{
    int i, nb_outputs = 2;

    if (args) {
        nb_outputs = strtol(args, NULL, 0);
        if (nb_outputs <= 0) {
            av_log(ctx, AV_LOG_ERROR, "Invalid number of outputs specified: %d.\n",
                   nb_outputs);
            return AVERROR(EINVAL);
        }
    }

    for (i = 0; i < nb_outputs; i++) {
        char name[32];
        AVFilterPad pad = { 0 };

        snprintf(name, sizeof(name), "output%d", i);
        pad.type = ctx->filter->inputs[0].type;
        pad.name = av_strdup(name);
        pad.rej_perms = AV_PERM_WRITE;

        ff_insert_outpad(ctx, i, &pad);
    }

    return 0;
}

static void split_uninit(AVFilterContext *ctx)
{
    int i;

    for (i = 0; i < ctx->nb_outputs; i++)
        av_freep(&ctx->output_pads[i].name);
}

static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
{
    AVFilterContext *ctx = inlink->dst;
    int i, ret = AVERROR_EOF;

    for (i = 0; i < ctx->nb_outputs; i++) {
        AVFilterBufferRef *buf_out;

        if (ctx->outputs[i]->closed)
            continue;
        buf_out = avfilter_ref_buffer(picref, ~AV_PERM_WRITE);
        if (!buf_out)
            return AVERROR(ENOMEM);

        ret = ff_start_frame(ctx->outputs[i], buf_out);
        if (ret < 0)
            break;
    }
    return ret;
}

static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
    AVFilterContext *ctx = inlink->dst;
    int i, ret = AVERROR_EOF;

    for (i = 0; i < ctx->nb_outputs; i++) {
        if (ctx->outputs[i]->closed)
            continue;
        ret = ff_draw_slice(ctx->outputs[i], y, h, slice_dir);
        if (ret < 0)
            break;
    }
    return ret;
}

static int end_frame(AVFilterLink *inlink)
{
    AVFilterContext *ctx = inlink->dst;
    int i, ret = AVERROR_EOF;

    for (i = 0; i < ctx->nb_outputs; i++) {
        if (ctx->outputs[i]->closed)
            continue;
        ret = ff_end_frame(ctx->outputs[i]);
        if (ret < 0)
            break;
    }
    return ret;
}

static const AVFilterPad avfilter_vf_split_inputs[] = {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .get_video_buffer = ff_null_get_video_buffer,
        .start_frame      = start_frame,
        .draw_slice       = draw_slice,
        .end_frame        = end_frame,
    },
    { NULL }
};

AVFilter avfilter_vf_split = {
    .name      = "split",
    .description = NULL_IF_CONFIG_SMALL("Pass on the input video to N outputs."),

    .init   = split_init,
    .uninit = split_uninit,

    .inputs    = avfilter_vf_split_inputs,
    .outputs   = NULL,
};

static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
{
    AVFilterContext *ctx = inlink->dst;
    int i, ret = 0;

    for (i = 0; i < ctx->nb_outputs; i++) {
        AVFilterBufferRef *buf_out = avfilter_ref_buffer(samplesref,
                                                         ~AV_PERM_WRITE);
        if (!buf_out) {
            ret = AVERROR(ENOMEM);
            break;
        }

        ret = ff_filter_samples(inlink->dst->outputs[i], buf_out);
        if (ret < 0)
            break;
    }
    avfilter_unref_buffer(samplesref);
    return ret;
}

static const AVFilterPad avfilter_af_asplit_inputs[] = {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_AUDIO,
        .get_audio_buffer = ff_null_get_audio_buffer,
        .filter_samples   = filter_samples
    },
    { NULL }
};

AVFilter avfilter_af_asplit = {
    .name        = "asplit",
    .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),

    .init   = split_init,
    .uninit = split_uninit,

    .inputs  = avfilter_af_asplit_inputs,
    .outputs = NULL,
};