FFmpeg/libavfilter/vf_setparams.c

/*
 * 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
 */

#include "libavutil/pixfmt.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"

typedef struct SetParamsContext {
    const AVClass *class;
    int color_range;
} SetParamsContext;

#define OFFSET(x) offsetof(SetParamsContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption setrange_options[] = {
    {"range", "select color range", OFFSET(color_range), AV_OPT_TYPE_INT, {.i64=-1},-1, AVCOL_RANGE_NB-1, FLAGS, "range"},
    {"auto",  "keep the same color range",   0, AV_OPT_TYPE_CONST, {.i64=-1},                       0, 0, FLAGS, "range"},
    {"unspecified",                  NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED},  0, 0, FLAGS, "range"},
    {"unknown",                      NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED},  0, 0, FLAGS, "range"},
    {"limited",                      NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range"},
    {"tv",                           NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range"},
    {"mpeg",                         NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range"},
    {"full",                         NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range"},
    {"pc",                           NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range"},
    {"jpeg",                         NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range"},
    {NULL}
};

AVFILTER_DEFINE_CLASS(setrange);

static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
    AVFilterContext *ctx = inlink->dst;
    SetParamsContext *s = ctx->priv;

    if (s->color_range >= 0)
        frame->color_range = s->color_range;
    return ff_filter_frame(ctx->outputs[0], frame);
}

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

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

AVFilter ff_vf_setrange = {
    .name        = "setrange",
    .description = NULL_IF_CONFIG_SMALL("Force color range for the output video frame."),
    .priv_size   = sizeof(SetParamsContext),
    .priv_class  = &setrange_class,
    .inputs      = inputs,
    .outputs     = outputs,
};