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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 libavfilter/vf_format.c
* format and noformat video filters
*/
#include "libavutil/pixdesc.h"
#include "avfilter.h"
typedef struct {
/**
* List of flags telling if a given image format has been listed
* as argument to the filter.
*/
int listed_pix_fmt_flags[PIX_FMT_NB];
} FormatContext;
#define PIX_FMT_NAME_MAXSIZE 32
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
FormatContext *format = ctx->priv;
const char *cur, *sep;
char pix_fmt_name[PIX_FMT_NAME_MAXSIZE];
int pix_fmt_name_len;
enum PixelFormat pix_fmt;
/* 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;
if (pix_fmt_name_len >= PIX_FMT_NAME_MAXSIZE) {
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;
pix_fmt = av_get_pix_fmt(pix_fmt_name);
if (pix_fmt == PIX_FMT_NONE) {
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;
enum PixelFormat pix_fmt;
formats = av_mallocz(sizeof(AVFilterFormats));
formats->formats = av_malloc(sizeof(enum PixelFormat) * PIX_FMT_NB);
for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
if (format->listed_pix_fmt_flags[pix_fmt] == flag)
formats->formats[formats->format_count++] = pix_fmt;
return formats;
}
static int query_formats_format(AVFilterContext *ctx)
{
avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 1));
return 0;
}
static int query_formats_noformat(AVFilterContext *ctx)
{
avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 0));
return 0;
}
static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
int w, int h)
{
return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}
static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
avfilter_start_frame(link->dst->outputs[0], picref);
}
static void end_frame(AVFilterLink *link)
{
avfilter_end_frame(link->dst->outputs[0]);
}
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
}
AVFilter avfilter_vf_format = {
.name = "format",
.description = "Convert the input video to one of the specified pixel formats.",
.init = init,
.query_formats = query_formats_format,
.priv_size = sizeof(FormatContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.get_video_buffer= get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.end_frame = end_frame, },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO },
{ .name = NULL}},
};
AVFilter avfilter_vf_noformat = {
.name = "noformat",
.description = "Force libavfilter not to use any of the specified pixel formats for the input to the next filter.",
.init = init,
.query_formats = query_formats_noformat,
.priv_size = sizeof(FormatContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.get_video_buffer= get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.end_frame = end_frame, },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO },
{ .name = NULL}},
};
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