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8be701d9f7
Up until now, an AVFilter's lists of input and output AVFilterPads were terminated by a sentinel and the only way to get the length of these lists was by using avfilter_pad_count(). This has two drawbacks: first, sizeof(AVFilterPad) is not negligible (i.e. 64B on 64bit systems); second, getting the size involves a function call instead of just reading the data. This commit therefore changes this. The sentinels are removed and new private fields nb_inputs and nb_outputs are added to AVFilter that contain the number of elements of the respective AVFilterPad array. Given that AVFilter.(in|out)puts are the only arrays of zero-terminated AVFilterPads an API user has access to (AVFilterContext.(in|out)put_pads are not zero-terminated and they already have a size field) the argument to avfilter_pad_count() is always one of these lists, so it just has to find the filter the list belongs to and read said number. This is slower than before, but a replacement function that just reads the internal numbers that users are expected to switch to will be added soon; and furthermore, avfilter_pad_count() is probably never called in hot loops anyway. This saves about 49KiB from the binary; notice that these sentinels are not in .bss despite being zeroed: they are in .data.rel.ro due to the non-sentinels. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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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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*
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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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*
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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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*/
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/**
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* @file
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* swap UV filter
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/version.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct SwapUVContext {
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const AVClass *class;
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} SwapUVContext;
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static const AVOption swapuv_options[] = {
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(swapuv);
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static void do_swap(AVFrame *frame)
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{
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FFSWAP(uint8_t*, frame->data[1], frame->data[2]);
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FFSWAP(int, frame->linesize[1], frame->linesize[2]);
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FFSWAP(AVBufferRef*, frame->buf[1], frame->buf[2]);
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}
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static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
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{
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AVFrame *picref = ff_default_get_video_buffer(link, w, h);
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do_swap(picref);
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return picref;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
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{
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do_swap(inpicref);
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return ff_filter_frame(link->dst->outputs[0], inpicref);
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}
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static int is_planar_yuv(const AVPixFmtDescriptor *desc)
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{
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int i;
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if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) ||
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desc->nb_components < 3 ||
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(desc->comp[1].depth != desc->comp[2].depth))
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return 0;
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for (i = 0; i < desc->nb_components; i++) {
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if (desc->comp[i].offset != 0 ||
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desc->comp[i].shift != 0 ||
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desc->comp[i].plane != i)
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return 0;
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}
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return 1;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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int fmt, ret;
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for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (is_planar_yuv(desc) && (ret = ff_add_format(&formats, fmt)) < 0)
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return ret;
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}
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return ff_set_common_formats(ctx, formats);
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}
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static const AVFilterPad swapuv_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_buffer.video = get_video_buffer,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad swapuv_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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};
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const AVFilter ff_vf_swapuv = {
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.name = "swapuv",
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.description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
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.query_formats = query_formats,
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.priv_size = sizeof(SwapUVContext),
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.priv_class = &swapuv_class,
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FILTER_INPUTS(swapuv_inputs),
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FILTER_OUTPUTS(swapuv_outputs),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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