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ffmpeg / libavfilter / vf_pixdesctest.c @ 2912e87a

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/*
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 * Copyright (c) 2009 Stefano Sabatini
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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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/**
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 * @file
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 * pixdesc test filter
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 */
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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typedef struct {
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    const AVPixFmtDescriptor *pix_desc;
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    uint16_t *line;
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} PixdescTestContext;
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static av_cold void uninit(AVFilterContext *ctx)
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{
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    PixdescTestContext *priv = ctx->priv;
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    av_freep(&priv->line);
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}
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static int config_props(AVFilterLink *inlink)
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{
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    PixdescTestContext *priv = inlink->dst->priv;
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    priv->pix_desc = &av_pix_fmt_descriptors[inlink->format];
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    if (!(priv->line = av_malloc(sizeof(*priv->line) * inlink->w)))
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        return AVERROR(ENOMEM);
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    return 0;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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    PixdescTestContext *priv = inlink->dst->priv;
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    AVFilterLink *outlink    = inlink->dst->outputs[0];
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    AVFilterBufferRef *outpicref;
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    int i;
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    outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
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                                                outlink->w, outlink->h);
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    outpicref = outlink->out_buf;
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    avfilter_copy_buffer_ref_props(outpicref, picref);
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    for (i = 0; i < 4; i++) {
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        int h = outlink->h;
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        h = i == 1 || i == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
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        if (outpicref->data[i]) {
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            uint8_t *data = outpicref->data[i] +
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                (outpicref->linesize[i] > 0 ? 0 : outpicref->linesize[i] * (h-1));
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            memset(data, 0, FFABS(outpicref->linesize[i]) * h);
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        }
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    }
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    /* copy palette */
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    if (priv->pix_desc->flags & PIX_FMT_PAL)
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        memcpy(outpicref->data[1], outpicref->data[1], 256*4);
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    avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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    PixdescTestContext *priv = inlink->dst->priv;
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    AVFilterBufferRef *inpic    = inlink->cur_buf;
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    AVFilterBufferRef *outpic   = inlink->dst->outputs[0]->out_buf;
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    int i, c, w = inlink->w;
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    for (c = 0; c < priv->pix_desc->nb_components; c++) {
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        int w1 = c == 1 || c == 2 ? w>>priv->pix_desc->log2_chroma_w : w;
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        int h1 = c == 1 || c == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
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        int y1 = c == 1 || c == 2 ? y>>priv->pix_desc->log2_chroma_h : y;
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        for (i = y1; i < y1 + h1; i++) {
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            av_read_image_line(priv->line,
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                               inpic->data,
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                               inpic->linesize,
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                               priv->pix_desc,
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                               0, i, c, w1, 0);
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            av_write_image_line(priv->line,
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                                outpic->data,
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                                outpic->linesize,
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                                priv->pix_desc,
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                                0, i, c, w1);
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        }
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    }
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    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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}
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AVFilter avfilter_vf_pixdesctest = {
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    .name        = "pixdesctest",
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    .description = NULL_IF_CONFIG_SMALL("Test pixel format definitions."),
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    .priv_size = sizeof(PixdescTestContext),
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    .uninit    = uninit,
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    .inputs    = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO,
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                                    .start_frame     = start_frame,
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                                    .draw_slice      = draw_slice,
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                                    .config_props    = config_props,
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                                    .min_perms       = AV_PERM_READ, },
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                                  { .name = NULL}},
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    .outputs   = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO, },
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                                  { .name = NULL}},
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};