vf_format.c 4.62 KB
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/*
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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
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * 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
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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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 * @file
Stefano Sabatini's avatar
Stefano Sabatini committed
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 * format and noformat video filters
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 */

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#include <string.h>

#include "libavutil/internal.h"
#include "libavutil/mem.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct {
    /**
     * List of flags telling if a given image format has been listed
     * as argument to the filter.
     */
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    int listed_pix_fmt_flags[AV_PIX_FMT_NB];
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} FormatContext;

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#define AV_PIX_FMT_NAME_MAXSIZE 32
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
    FormatContext *format = ctx->priv;
    const char *cur, *sep;
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    char             pix_fmt_name[AV_PIX_FMT_NAME_MAXSIZE];
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    int              pix_fmt_name_len;
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    enum AVPixelFormat pix_fmt;
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    /* parse the list of formats */
    for (cur = args; cur; cur = sep ? sep+1 : NULL) {
        if (!(sep = strchr(cur, ':')))
            pix_fmt_name_len = strlen(cur);
        else
            pix_fmt_name_len = sep - cur;
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        if (pix_fmt_name_len >= AV_PIX_FMT_NAME_MAXSIZE) {
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            av_log(ctx, AV_LOG_ERROR, "Format name too long\n");
            return -1;
        }

        memcpy(pix_fmt_name, cur, pix_fmt_name_len);
        pix_fmt_name[pix_fmt_name_len] = 0;
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        pix_fmt = av_get_pix_fmt(pix_fmt_name);
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        if (pix_fmt == AV_PIX_FMT_NONE) {
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            av_log(ctx, AV_LOG_ERROR, "Unknown pixel format: %s\n", pix_fmt_name);
            return -1;
        }

        format->listed_pix_fmt_flags[pix_fmt] = 1;
    }

    return 0;
}

static AVFilterFormats *make_format_list(FormatContext *format, int flag)
{
    AVFilterFormats *formats;
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    enum AVPixelFormat pix_fmt;
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    formats = av_mallocz(sizeof(AVFilterFormats));
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    formats->formats = av_malloc(sizeof(enum AVPixelFormat) * AV_PIX_FMT_NB);
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    for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
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        if (format->listed_pix_fmt_flags[pix_fmt] == flag)
            formats->formats[formats->format_count++] = pix_fmt;

    return formats;
}

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#if CONFIG_FORMAT_FILTER
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static int query_formats_format(AVFilterContext *ctx)
{
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    ff_set_common_formats(ctx, make_format_list(ctx->priv, 1));
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    return 0;
}

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static const AVFilterPad avfilter_vf_format_inputs[] = {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .get_video_buffer = ff_null_get_video_buffer,
    },
    { NULL }
};

static const AVFilterPad avfilter_vf_format_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO
    },
    { NULL }
};

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AVFilter avfilter_vf_format = {
    .name      = "format",
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    .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
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    .init      = init,

    .query_formats = query_formats_format,

    .priv_size = sizeof(FormatContext),

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    .inputs    = avfilter_vf_format_inputs,
    .outputs   = avfilter_vf_format_outputs,
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};
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#endif /* CONFIG_FORMAT_FILTER */
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#if CONFIG_NOFORMAT_FILTER
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static int query_formats_noformat(AVFilterContext *ctx)
{
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    ff_set_common_formats(ctx, make_format_list(ctx->priv, 0));
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    return 0;
}

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static const AVFilterPad avfilter_vf_noformat_inputs[] = {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .get_video_buffer = ff_null_get_video_buffer,
    },
    { NULL }
};

static const AVFilterPad avfilter_vf_noformat_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO
    },
    { NULL }
};

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AVFilter avfilter_vf_noformat = {
    .name      = "noformat",
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    .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
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    .init      = init,

    .query_formats = query_formats_noformat,

    .priv_size = sizeof(FormatContext),

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    .inputs    = avfilter_vf_noformat_inputs,
    .outputs   = avfilter_vf_noformat_outputs,
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};
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#endif /* CONFIG_NOFORMAT_FILTER */