/* * 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 "libavutil/opt.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 { const AVClass *class; 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 const AVOption hflip_options[] = { { NULL } }; AVFILTER_DEFINE_CLASS(hflip); 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, ff_filter_get_nb_threads(ctx))); 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), .priv_class = &hflip_class, .query_formats = query_formats, .inputs = avfilter_vf_hflip_inputs, .outputs = avfilter_vf_hflip_outputs, .flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, };