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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 "formats.h"
#include "internal.h"
#include "video.h"
typedef struct FormatContext {
const AVClass *class;
char *pix_fmts;
/**
* pix_fmts parsed into AVPixelFormats and terminated with
* AV_PIX_FMT_NONE
*/
enum AVPixelFormat *formats;
} FormatContext;
static av_cold void uninit(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
av_freep(&s->formats);
}
static av_cold int init(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
char *cur, *sep;
int nb_formats = 1;
int i;
int ret;
if (!s->pix_fmts) {
av_log(ctx, AV_LOG_ERROR, "Empty output format string.\n");
return AVERROR(EINVAL);
}
/* count the formats */
cur = s->pix_fmts;
while ((cur = strchr(cur, '|'))) {
nb_formats++;
if (*cur)
cur++;
}
s->formats = av_malloc_array(nb_formats + 1, sizeof(*s->formats));
if (!s->formats)
return AVERROR(ENOMEM);
/* parse the list of formats */
cur = s->pix_fmts;
for (i = 0; i < nb_formats; i++) {
sep = strchr(cur, '|');
if (sep)
*sep++ = 0;
if ((ret = ff_parse_pixel_format(&s->formats[i], cur, ctx)) < 0)
return ret;
cur = sep;
}
s->formats[nb_formats] = AV_PIX_FMT_NONE;
if (!strcmp(ctx->filter->name, "noformat")) {
const AVPixFmtDescriptor *desc = NULL;
enum AVPixelFormat *formats_allowed;
int nb_formats_lavu = 0, nb_formats_allowed = 0;
/* count the formats known to lavu */
while ((desc = av_pix_fmt_desc_next(desc)))
nb_formats_lavu++;
formats_allowed = av_malloc_array(nb_formats_lavu + 1, sizeof(*formats_allowed));
if (!formats_allowed)
return AVERROR(ENOMEM);
/* for each format known to lavu, check if it's in the list of
* forbidden formats */
while ((desc = av_pix_fmt_desc_next(desc))) {
enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(desc);
for (i = 0; i < nb_formats; i++) {
if (s->formats[i] == pix_fmt)
break;
}
if (i < nb_formats)
continue;
formats_allowed[nb_formats_allowed++] = pix_fmt;
}
formats_allowed[nb_formats_allowed] = AV_PIX_FMT_NONE;
av_freep(&s->formats);
s->formats = formats_allowed;
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
return ff_set_common_formats_from_list(ctx, s->formats);
}
#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 },
{ 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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