diff options
Diffstat (limited to 'libavfilter/vf_swapuv.c')
-rw-r--r-- | libavfilter/vf_swapuv.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/libavfilter/vf_swapuv.c b/libavfilter/vf_swapuv.c new file mode 100644 index 0000000..175e39c --- /dev/null +++ b/libavfilter/vf_swapuv.c @@ -0,0 +1,110 @@ +/* + * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> + * + * 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 + * swap UV filter + */ + +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "formats.h" +#include "internal.h" +#include "video.h" + +static void do_swap(AVFrame *frame) +{ + FFSWAP(uint8_t*, frame->data[1], frame->data[2]); + FFSWAP(int, frame->linesize[1], frame->linesize[2]); + FFSWAP(uint64_t, frame->error[1], frame->error[2]); + FFSWAP(AVBufferRef*, frame->buf[1], frame->buf[2]); +} + +static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h) +{ + AVFrame *picref = ff_default_get_video_buffer(link, w, h); + do_swap(picref); + return picref; +} + +static int filter_frame(AVFilterLink *link, AVFrame *inpicref) +{ + do_swap(inpicref); + return ff_filter_frame(link->dst->outputs[0], inpicref); +} + +static int is_planar_yuv(const AVPixFmtDescriptor *desc) +{ + int i; + + if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) || + desc->nb_components < 3 || + (desc->comp[1].depth_minus1 != desc->comp[2].depth_minus1)) + return 0; + for (i = 0; i < desc->nb_components; i++) { + if (desc->comp[i].offset_plus1 != 1 || + desc->comp[i].shift != 0 || + desc->comp[i].plane != i) + return 0; + } + + return 1; +} + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats = NULL; + int fmt; + + for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); + if (is_planar_yuv(desc)) + ff_add_format(&formats, fmt); + } + + ff_set_common_formats(ctx, formats); + return 0; +} + +static const AVFilterPad swapuv_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .get_video_buffer = get_video_buffer, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad swapuv_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +AVFilter ff_vf_swapuv = { + .name = "swapuv", + .description = NULL_IF_CONFIG_SMALL("Swap U and V components."), + .query_formats = query_formats, + .inputs = swapuv_inputs, + .outputs = swapuv_outputs, +}; |