PeerStreamer

/*

 * This file is part of FFmpeg.

 * copyright (C) 2009 Stefano Sabatini

 *

 * 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

 * pixdesc test filter

 */

#include "libavutil/pixdesc.h"

#include "avfilter.h"

typedef struct {

    const AVPixFmtDescriptor *pix_desc;

    uint16_t *line;

} PixdescTestContext;

static av_cold void uninit(AVFilterContext *ctx)

{

    PixdescTestContext *priv = ctx->priv;

    av_freep(&priv->line);

}

static int config_props(AVFilterLink *inlink)

{

    PixdescTestContext *priv = inlink->dst->priv;

    priv->pix_desc = &av_pix_fmt_descriptors[inlink->format];

    if (!(priv->line = av_malloc(sizeof(*priv->line) * inlink->w)))

        return AVERROR(ENOMEM);

    return 0;

}

static void start_frame(AVFilterLink *inlink, AVFilterPicRef *picref)

{

    PixdescTestContext *priv = inlink->dst->priv;

    AVFilterLink *outlink    = inlink->dst->outputs[0];

    AVFilterPicRef *outpicref;

    int i;

    outlink->outpic = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,

                                                outlink->w, outlink->h);

    outpicref = outlink->outpic;

    avfilter_copy_picref_props(outpicref, picref);

    for (i = 0; i < 4; i++) {

        int h = outlink->h;

        h = i == 1 || i == 2 ? h>>priv->pix_desc->log2_chroma_h : h;

        if (outpicref->data[i]) {

            uint8_t *data = outpicref->data[i] +

                (outpicref->linesize[i] > 0 ? 0 : outpicref->linesize[i] * (h-1));

            memset(data, 0, FFABS(outpicref->linesize[i]) * h);

        }

    }

    /* copy palette */

    if (priv->pix_desc->flags & PIX_FMT_PAL)

        memcpy(outpicref->data[1], outpicref->data[1], 256*4);

    avfilter_start_frame(outlink, avfilter_ref_pic(outpicref, ~0));

}

static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)

{

    PixdescTestContext *priv = inlink->dst->priv;

    AVFilterPicRef *inpic    = inlink->cur_pic;

    AVFilterPicRef *outpic   = inlink->dst->outputs[0]->outpic;

    int i, c, w = inlink->w;

    for (c = 0; c < priv->pix_desc->nb_components; c++) {

        int w1 = c == 1 || c == 2 ? w>>priv->pix_desc->log2_chroma_w : w;

        int h1 = c == 1 || c == 2 ? h>>priv->pix_desc->log2_chroma_h : h;

        int y1 = c == 1 || c == 2 ? y>>priv->pix_desc->log2_chroma_h : y;

        for (i = y1; i < y1 + h1; i++) {

            read_line(priv->line,

                      inpic->data,

                      inpic->linesize,

                      priv->pix_desc,

                      0, i, c, w1, 0);

            write_line(priv->line,

                       outpic->data,

                       outpic->linesize,

                       priv->pix_desc,

                       0, i, c, w1);

        }

    }

    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);

}

AVFilter avfilter_vf_pixdesctest = {

    .name        = "pixdesctest",

    .description = "Test pixel format definitions.",

    .priv_size = sizeof(PixdescTestContext),

    .uninit    = uninit,

    .inputs    = (AVFilterPad[]) {{ .name            = "default",

                                    .type            = AVMEDIA_TYPE_VIDEO,

                                    .start_frame     = start_frame,

                                    .draw_slice      = draw_slice,

                                    .config_props    = config_props,

                                    .min_perms       = AV_PERM_READ, },

                                  { .name = NULL}},

    .outputs   = (AVFilterPad[]) {{ .name            = "default",

                                    .type            = AVMEDIA_TYPE_VIDEO, },

                                  { .name = NULL}},

};