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/*
* Copyright (c) 2007 Bobby Bingham
*
* 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
*/
/**
* @file
* format and noformat video filters
*/
#include "config_components.h"
#include <string.h>
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"
typedef struct FormatContext {
const AVClass *class;
char *pix_fmts;
char *csps;
char *ranges;
AVFilterFormats *formats; ///< parsed from `pix_fmts`
AVFilterFormats *color_spaces; ///< parsed from `csps`
AVFilterFormats *color_ranges; ///< parsed from `ranges`
} FormatContext;
static av_cold void uninit(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
ff_formats_unref(&s->formats);
ff_formats_unref(&s->color_spaces);
ff_formats_unref(&s->color_ranges);
}
static av_cold int invert_formats(AVFilterFormats **fmts,
AVFilterFormats *allfmts)
{
if (!allfmts)
return AVERROR(ENOMEM);
if (!*fmts) {
/* empty fmt list means no restriction, regardless of filter type */
ff_formats_unref(&allfmts);
return 0;
}
for (int i = 0; i < allfmts->nb_formats; i++) {
for (int j = 0; j < (*fmts)->nb_formats; j++) {
if (allfmts->formats[i] == (*fmts)->formats[j]) {
/* format is forbidden, remove it from allfmts list */
memmove(&allfmts->formats[i], &allfmts->formats[i+1],
(allfmts->nb_formats - (i+1)) * sizeof(*allfmts->formats));
allfmts->nb_formats--;
i--; /* repeat loop with same idx */
break;
}
}
}
ff_formats_unref(fmts);
*fmts = allfmts;
return 0;
}
static int parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
{
char *tail;
int pix_fmt = av_get_pix_fmt(arg);
if (pix_fmt == AV_PIX_FMT_NONE) {
pix_fmt = strtol(arg, &tail, 0);
if (*tail || !av_pix_fmt_desc_get(pix_fmt)) {
av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
return AVERROR(EINVAL);
}
}
*ret = pix_fmt;
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
enum AVPixelFormat pix_fmt;
int ret;
for (char *sep, *cur = s->pix_fmts; cur; cur = sep) {
sep = strchr(cur, '|');
if (sep && *sep)
*sep++ = 0;
if ((ret = parse_pixel_format(&pix_fmt, cur, ctx)) < 0 ||
(ret = ff_add_format(&s->formats, pix_fmt)) < 0)
return ret;
}
for (char *sep, *cur = s->csps; cur; cur = sep) {
sep = strchr(cur, '|');
if (sep && *sep)
*sep++ = 0;
if ((ret = av_color_space_from_name(cur)) < 0 ||
(ret = ff_add_format(&s->color_spaces, ret)) < 0)
return ret;
}
for (char *sep, *cur = s->ranges; cur; cur = sep) {
sep = strchr(cur, '|');
if (sep && *sep)
*sep++ = 0;
if ((ret = av_color_range_from_name(cur)) < 0 ||
(ret = ff_add_format(&s->color_ranges, ret)) < 0)
return ret;
}
if (!strcmp(ctx->filter->name, "noformat")) {
if ((ret = invert_formats(&s->formats, ff_all_formats(AVMEDIA_TYPE_VIDEO))) < 0 ||
(ret = invert_formats(&s->color_spaces, ff_all_color_spaces())) < 0 ||
(ret = invert_formats(&s->color_ranges, ff_all_color_ranges())) < 0)
return ret;
}
/* hold on to a ref for the lifetime of the filter */
if (s->formats && (ret = ff_formats_ref(s->formats, &s->formats)) < 0 ||
s->color_spaces && (ret = ff_formats_ref(s->color_spaces, &s->color_spaces)) < 0 ||
s->color_ranges && (ret = ff_formats_ref(s->color_ranges, &s->color_ranges)) < 0)
return ret;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
int ret;
if (s->formats && (ret = ff_set_common_formats(ctx, s->formats)) < 0 ||
s->color_spaces && (ret = ff_set_common_color_spaces(ctx, s->color_spaces)) < 0 ||
s->color_ranges && (ret = ff_set_common_color_ranges(ctx, s->color_ranges)) < 0)
return ret;
return 0;
}
#define OFFSET(x) offsetof(FormatContext, x)
static const AVOption options[] = {
{ "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
{ "color_spaces", "A '|'-separated list of color spaces", OFFSET(csps), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
{ "color_ranges", "A '|'-separated list of color ranges", OFFSET(ranges), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
{ NULL }
};
AVFILTER_DEFINE_CLASS_EXT(format, "(no)format", options);
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_buffer.video = ff_null_get_video_buffer,
},
};
#if CONFIG_FORMAT_FILTER
const AVFilter ff_vf_format = {
.name = "format",
.description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(FormatContext),
.priv_class = &format_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
};
#endif /* CONFIG_FORMAT_FILTER */
#if CONFIG_NOFORMAT_FILTER
const AVFilter ff_vf_noformat = {
.name = "noformat",
.description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
.priv_class = &format_class,
.init = init,
.uninit = uninit,
.priv_size = sizeof(FormatContext),
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
};
#endif /* CONFIG_NOFORMAT_FILTER */
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