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- /*
- * Copyright (c) 2007 Benoit Fouet
- * Copyright (c) 2010 Stefano Sabatini
- *
- * 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
- * horizontal flip filter
- */
- #include <string.h>
- #include "avfilter.h"
- #include "formats.h"
- #include "internal.h"
- #include "video.h"
- #include "libavutil/pixdesc.h"
- #include "libavutil/internal.h"
- #include "libavutil/intreadwrite.h"
- #include "libavutil/imgutils.h"
- typedef struct FlipContext {
- int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
- int planewidth[4]; ///< width of each plane
- int planeheight[4]; ///< height of each plane
- } FlipContext;
- static int query_formats(AVFilterContext *ctx)
- {
- AVFilterFormats *pix_fmts = NULL;
- int fmt, ret;
- for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
- const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
- if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
- desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||
- (desc->log2_chroma_w != desc->log2_chroma_h &&
- desc->comp[0].plane == desc->comp[1].plane)) &&
- (ret = ff_add_format(&pix_fmts, fmt)) < 0)
- return ret;
- }
- return ff_set_common_formats(ctx, pix_fmts);
- }
- static int config_props(AVFilterLink *inlink)
- {
- FlipContext *s = inlink->dst->priv;
- const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
- const int hsub = pix_desc->log2_chroma_w;
- const int vsub = pix_desc->log2_chroma_h;
- av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
- s->planewidth[0] = s->planewidth[3] = inlink->w;
- s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
- s->planeheight[0] = s->planeheight[3] = inlink->h;
- s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
- return 0;
- }
- typedef struct ThreadData {
- AVFrame *in, *out;
- } ThreadData;
- static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
- {
- FlipContext *s = ctx->priv;
- ThreadData *td = arg;
- AVFrame *in = td->in;
- AVFrame *out = td->out;
- uint8_t *inrow, *outrow;
- int i, j, plane, step;
- for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
- const int width = s->planewidth[plane];
- const int height = s->planeheight[plane];
- const int start = (height * job ) / nb_jobs;
- const int end = (height * (job+1)) / nb_jobs;
- step = s->max_step[plane];
- outrow = out->data[plane] + start * out->linesize[plane];
- inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step;
- for (i = start; i < end; i++) {
- switch (step) {
- case 1:
- for (j = 0; j < width; j++)
- outrow[j] = inrow[-j];
- break;
- case 2:
- {
- uint16_t *outrow16 = (uint16_t *)outrow;
- uint16_t * inrow16 = (uint16_t *) inrow;
- for (j = 0; j < width; j++)
- outrow16[j] = inrow16[-j];
- }
- break;
- case 3:
- {
- uint8_t *in = inrow;
- uint8_t *out = outrow;
- for (j = 0; j < width; j++, out += 3, in -= 3) {
- int32_t v = AV_RB24(in);
- AV_WB24(out, v);
- }
- }
- break;
- case 4:
- {
- uint32_t *outrow32 = (uint32_t *)outrow;
- uint32_t * inrow32 = (uint32_t *) inrow;
- for (j = 0; j < width; j++)
- outrow32[j] = inrow32[-j];
- }
- break;
- default:
- for (j = 0; j < width; j++)
- memcpy(outrow + j*step, inrow - j*step, step);
- }
- inrow += in ->linesize[plane];
- outrow += out->linesize[plane];
- }
- }
- return 0;
- }
- static int filter_frame(AVFilterLink *inlink, AVFrame *in)
- {
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- ThreadData td;
- AVFrame *out;
- out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
- if (!out) {
- av_frame_free(&in);
- return AVERROR(ENOMEM);
- }
- av_frame_copy_props(out, in);
- /* copy palette if required */
- if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL)
- memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
- td.in = in, td.out = out;
- ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads));
- av_frame_free(&in);
- return ff_filter_frame(outlink, out);
- }
- static const AVFilterPad avfilter_vf_hflip_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .filter_frame = filter_frame,
- .config_props = config_props,
- },
- { NULL }
- };
- static const AVFilterPad avfilter_vf_hflip_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- },
- { NULL }
- };
- AVFilter ff_vf_hflip = {
- .name = "hflip",
- .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
- .priv_size = sizeof(FlipContext),
- .query_formats = query_formats,
- .inputs = avfilter_vf_hflip_inputs,
- .outputs = avfilter_vf_hflip_outputs,
- .flags = AVFILTER_FLAG_SLICE_THREADS,
- };
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