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ffmpeg / libavfilter / defaults.c @ 2912e87a

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/*
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 * Filter layer - default implementations
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 * Copyright (c) 2007 Bobby Bingham
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/audioconvert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/samplefmt.h"
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#include "avfilter.h"
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#include "internal.h"
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/* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
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void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
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{
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    av_free(ptr->data[0]);
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    av_free(ptr);
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}
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/* TODO: set the buffer's priv member to a context structure for the whole
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 * filter chain.  This will allow for a buffer pool instead of the constant
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 * alloc & free cycle currently implemented. */
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AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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    int linesize[4];
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    uint8_t *data[4];
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    AVFilterBufferRef *picref = NULL;
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    // +2 is needed for swscaler, +16 to be SIMD-friendly
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    if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)
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        return NULL;
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    picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
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                                                       perms, w, h, link->format);
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    if (!picref) {
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        av_free(data[0]);
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        return NULL;
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    }
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    return picref;
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}
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AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
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                                                     enum AVSampleFormat sample_fmt, int size,
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                                                     int64_t channel_layout, int planar)
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{
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    AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
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    AVFilterBufferRef *ref = NULL;
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    int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;
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    char *buf;
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    if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
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        goto fail;
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    ref->buf                   = samples;
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    ref->format                = sample_fmt;
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    ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));
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    if (!ref->audio)
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        goto fail;
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    ref->audio->channel_layout = channel_layout;
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    ref->audio->size           = size;
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    ref->audio->planar         = planar;
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    /* make sure the buffer gets read permission or it's useless for output */
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    ref->perms = perms | AV_PERM_READ;
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    samples->refcount   = 1;
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    samples->free       = ff_avfilter_default_free_buffer;
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    sample_size = av_get_bits_per_sample_fmt(sample_fmt) >>3;
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    chans_nb = av_get_channel_layout_nb_channels(channel_layout);
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    per_channel_size = size/chans_nb;
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    ref->audio->nb_samples = per_channel_size/sample_size;
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    /* Set the number of bytes to traverse to reach next sample of a particular channel:
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     * For planar, this is simply the sample size.
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     * For packed, this is the number of samples * sample_size.
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     */
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    for (i = 0; i < chans_nb; i++)
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        samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;
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    memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));
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    /* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
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    bufsize = (size + 15)&~15;
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    buf = av_malloc(bufsize);
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    if (!buf)
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        goto fail;
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    /* For planar, set the start point of each channel's data within the buffer
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     * For packed, set the start point of the entire buffer only
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     */
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    samples->data[0] = buf;
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    if (buf && planar) {
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        for (i = 1; i < chans_nb; i++) {
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            step_size += per_channel_size;
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            samples->data[i] = buf + step_size;
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        }
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    } else {
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        for (i = 1; i < chans_nb; i++)
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            samples->data[i] = buf;
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    }
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    memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));
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    memcpy(ref->data,     samples->data,     sizeof(ref->data));
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    memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));
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    return ref;
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fail:
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    if (ref)
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        av_free(ref->audio);
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    av_free(ref);
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    av_free(samples);
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    return NULL;
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}
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void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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    AVFilterLink *outlink = NULL;
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    if (inlink->dst->output_count)
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        outlink = inlink->dst->outputs[0];
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    if (outlink) {
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        outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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        avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
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        avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
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    }
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}
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void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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    AVFilterLink *outlink = NULL;
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    if (inlink->dst->output_count)
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        outlink = inlink->dst->outputs[0];
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    if (outlink)
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        avfilter_draw_slice(outlink, y, h, slice_dir);
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}
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void avfilter_default_end_frame(AVFilterLink *inlink)
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{
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    AVFilterLink *outlink = NULL;
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    if (inlink->dst->output_count)
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        outlink = inlink->dst->outputs[0];
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    avfilter_unref_buffer(inlink->cur_buf);
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    inlink->cur_buf = NULL;
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    if (outlink) {
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        if (outlink->out_buf) {
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            avfilter_unref_buffer(outlink->out_buf);
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            outlink->out_buf = NULL;
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        }
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        avfilter_end_frame(outlink);
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    }
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}
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/* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
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void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
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{
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    AVFilterLink *outlink = NULL;
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    if (inlink->dst->output_count)
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        outlink = inlink->dst->outputs[0];
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    if (outlink) {
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        outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE, samplesref->format,
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                                                             samplesref->audio->size,
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                                                             samplesref->audio->channel_layout,
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                                                             samplesref->audio->planar);
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        outlink->out_buf->pts                = samplesref->pts;
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        outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
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        avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
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        avfilter_unref_buffer(outlink->out_buf);
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        outlink->out_buf = NULL;
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    }
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    avfilter_unref_buffer(samplesref);
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    inlink->cur_buf = NULL;
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}
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/**
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 * default config_link() implementation for output video links to simplify
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 * the implementation of one input one output video filters */
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int avfilter_default_config_output_link(AVFilterLink *link)
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{
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    if (link->src->input_count && link->src->inputs[0]) {
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        if (link->type == AVMEDIA_TYPE_VIDEO) {
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            link->w = link->src->inputs[0]->w;
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            link->h = link->src->inputs[0]->h;
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            link->time_base = link->src->inputs[0]->time_base;
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        } else if (link->type == AVMEDIA_TYPE_AUDIO) {
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            link->channel_layout = link->src->inputs[0]->channel_layout;
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            link->sample_rate    = link->src->inputs[0]->sample_rate;
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        }
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    } else {
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        /* XXX: any non-simple filter which would cause this branch to be taken
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         * really should implement its own config_props() for this link. */
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        return -1;
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    }
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    return 0;
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}
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/**
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 * A helper for query_formats() which sets all links to the same list of
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 * formats. If there are no links hooked to this filter, the list of formats is
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 * freed.
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 *
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 * FIXME: this will need changed for filters with a mix of pad types
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 * (video + audio, etc)
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 */
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void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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    int count = 0, i;
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    for (i = 0; i < ctx->input_count; i++) {
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        if (ctx->inputs[i]) {
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            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
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            count++;
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        }
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    }
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    for (i = 0; i < ctx->output_count; i++) {
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        if (ctx->outputs[i]) {
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            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
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            count++;
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        }
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    }
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    if (!count) {
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        av_free(formats->formats);
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        av_free(formats->refs);
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        av_free(formats);
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    }
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}
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int avfilter_default_query_formats(AVFilterContext *ctx)
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{
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    enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
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                            ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
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                            AVMEDIA_TYPE_VIDEO;
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    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
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    return 0;
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}
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void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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    avfilter_start_frame(link->dst->outputs[0], picref);
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}
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void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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}
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void avfilter_null_end_frame(AVFilterLink *link)
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{
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    avfilter_end_frame(link->dst->outputs[0]);
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}
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void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
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{
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    avfilter_filter_samples(link->dst->outputs[0], samplesref);
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}
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AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
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}
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AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
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                                                  enum AVSampleFormat sample_fmt, int size,
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                                                  int64_t channel_layout, int packed)
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{
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    return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
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                                     size, channel_layout, packed);
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}
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