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* Copyright (c) 2007 Bobby Bingham
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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* format and noformat video filters
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#include "libavutil/internal.h"
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#include "libavutil/mem.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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typedef struct FormatContext {
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* pix_fmts parsed into AVPixelFormats and terminated with
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enum AVPixelFormat *formats;
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static av_cold void uninit(AVFilterContext *ctx)
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FormatContext *s = ctx->priv;
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av_freep(&s->formats);
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static av_cold int init(AVFilterContext *ctx)
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FormatContext *s = ctx->priv;
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av_log(ctx, AV_LOG_ERROR, "Empty output format string.\n");
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return AVERROR(EINVAL);
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/* count the formats */
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while ((cur = strchr(cur, '|'))) {
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s->formats = av_malloc_array(nb_formats + 1, sizeof(*s->formats));
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return AVERROR(ENOMEM);
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/* parse the list of formats */
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for (i = 0; i < nb_formats; i++) {
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sep = strchr(cur, '|');
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if ((ret = ff_parse_pixel_format(&s->formats[i], cur, ctx)) < 0)
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s->formats[nb_formats] = AV_PIX_FMT_NONE;
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if (!strcmp(ctx->filter->name, "noformat")) {
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const AVPixFmtDescriptor *desc = NULL;
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enum AVPixelFormat *formats_allowed;
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int nb_formats_lavu = 0, nb_formats_allowed = 0;
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/* count the formats known to lavu */
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while ((desc = av_pix_fmt_desc_next(desc)))
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formats_allowed = av_malloc_array(nb_formats_lavu + 1, sizeof(*formats_allowed));
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if (!formats_allowed)
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return AVERROR(ENOMEM);
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/* for each format known to lavu, check if it's in the list of
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* forbidden formats */
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while ((desc = av_pix_fmt_desc_next(desc))) {
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enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(desc);
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for (i = 0; i < nb_formats; i++) {
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if (s->formats[i] == pix_fmt)
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formats_allowed[nb_formats_allowed++] = pix_fmt;
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formats_allowed[nb_formats_allowed] = AV_PIX_FMT_NONE;
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av_freep(&s->formats);
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s->formats = formats_allowed;
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static int query_formats(AVFilterContext *ctx)
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FormatContext *s = ctx->priv;
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AVFilterFormats *formats = ff_make_format_list(s->formats);
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, formats);
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#define OFFSET(x) offsetof(FormatContext, x)
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static const AVOption options[] = {
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{ "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM },
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#if CONFIG_FORMAT_FILTER
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#define format_options options
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AVFILTER_DEFINE_CLASS(format);
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static const AVFilterPad avfilter_vf_format_inputs[] = {
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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static const AVFilterPad avfilter_vf_format_outputs[] = {
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.type = AVMEDIA_TYPE_VIDEO
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AVFilter ff_vf_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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.query_formats = query_formats,
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.priv_size = sizeof(FormatContext),
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.priv_class = &format_class,
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.inputs = avfilter_vf_format_inputs,
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.outputs = avfilter_vf_format_outputs,
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#endif /* CONFIG_FORMAT_FILTER */
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#if CONFIG_NOFORMAT_FILTER
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#define noformat_options options
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AVFILTER_DEFINE_CLASS(noformat);
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static const AVFilterPad avfilter_vf_noformat_inputs[] = {
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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static const AVFilterPad avfilter_vf_noformat_outputs[] = {
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.type = AVMEDIA_TYPE_VIDEO
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AVFilter ff_vf_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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.query_formats = query_formats,
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.priv_size = sizeof(FormatContext),
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.priv_class = &noformat_class,
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.inputs = avfilter_vf_noformat_inputs,
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.outputs = avfilter_vf_noformat_outputs,
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#endif /* CONFIG_NOFORMAT_FILTER */