yading@10: /*
yading@10:  * Copyright (c) 2007 Benoit Fouet
yading@10:  * Copyright (c) 2010 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * horizontal flip filter
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: 
yading@10: #include "avfilter.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: 
yading@10: typedef struct {
yading@10:     int max_step[4];    ///< max pixel step for each plane, expressed as a number of bytes
yading@10:     int hsub, vsub;     ///< chroma subsampling
yading@10: } FlipContext;
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     AVFilterFormats *pix_fmts = NULL;
yading@10:     int fmt;
yading@10: 
yading@10:     for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
yading@10:         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
yading@10:         if (!(desc->flags & PIX_FMT_HWACCEL ||
yading@10:               desc->flags & PIX_FMT_BITSTREAM ||
yading@10:               (desc->log2_chroma_w != desc->log2_chroma_h &&
yading@10:                desc->comp[0].plane == desc->comp[1].plane)))
yading@10:             ff_add_format(&pix_fmts, fmt);
yading@10:     }
yading@10: 
yading@10:     ff_set_common_formats(ctx, pix_fmts);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_props(AVFilterLink *inlink)
yading@10: {
yading@10:     FlipContext *flip = inlink->dst->priv;
yading@10:     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
yading@10: 
yading@10:     av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
yading@10:     flip->hsub = pix_desc->log2_chroma_w;
yading@10:     flip->vsub = pix_desc->log2_chroma_h;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *in)
yading@10: {
yading@10:     AVFilterContext *ctx  = inlink->dst;
yading@10:     FlipContext *flip     = ctx->priv;
yading@10:     AVFilterLink *outlink = ctx->outputs[0];
yading@10:     AVFrame *out;
yading@10:     uint8_t *inrow, *outrow;
yading@10:     int i, j, plane, step, hsub, vsub;
yading@10: 
yading@10:     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
yading@10:     if (!out) {
yading@10:         av_frame_free(&in);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     av_frame_copy_props(out, in);
yading@10: 
yading@10:     /* copy palette if required */
yading@10:     if (av_pix_fmt_desc_get(inlink->format)->flags & PIX_FMT_PAL)
yading@10:         memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
yading@10: 
yading@10:     for (plane = 0; plane < 4 && in->data[plane]; plane++) {
yading@10:         step = flip->max_step[plane];
yading@10:         hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
yading@10:         vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
yading@10: 
yading@10:         outrow = out->data[plane];
yading@10:         inrow  = in ->data[plane] + ((inlink->w >> hsub) - 1) * step;
yading@10:         for (i = 0; i < in->height >> vsub; i++) {
yading@10:             switch (step) {
yading@10:             case 1:
yading@10:                 for (j = 0; j < (inlink->w >> hsub); j++)
yading@10:                     outrow[j] = inrow[-j];
yading@10:             break;
yading@10: 
yading@10:             case 2:
yading@10:             {
yading@10:                 uint16_t *outrow16 = (uint16_t *)outrow;
yading@10:                 uint16_t * inrow16 = (uint16_t *) inrow;
yading@10:                 for (j = 0; j < (inlink->w >> hsub); j++)
yading@10:                     outrow16[j] = inrow16[-j];
yading@10:             }
yading@10:             break;
yading@10: 
yading@10:             case 3:
yading@10:             {
yading@10:                 uint8_t *in  =  inrow;
yading@10:                 uint8_t *out = outrow;
yading@10:                 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
yading@10:                     int32_t v = AV_RB24(in);
yading@10:                     AV_WB24(out, v);
yading@10:                 }
yading@10:             }
yading@10:             break;
yading@10: 
yading@10:             case 4:
yading@10:             {
yading@10:                 uint32_t *outrow32 = (uint32_t *)outrow;
yading@10:                 uint32_t * inrow32 = (uint32_t *) inrow;
yading@10:                 for (j = 0; j < (inlink->w >> hsub); j++)
yading@10:                     outrow32[j] = inrow32[-j];
yading@10:             }
yading@10:             break;
yading@10: 
yading@10:             default:
yading@10:                 for (j = 0; j < (inlink->w >> hsub); j++)
yading@10:                     memcpy(outrow + j*step, inrow - j*step, step);
yading@10:             }
yading@10: 
yading@10:             inrow  += in ->linesize[plane];
yading@10:             outrow += out->linesize[plane];
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     av_frame_free(&in);
yading@10:     return ff_filter_frame(outlink, out);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_hflip_inputs[] = {
yading@10:     {
yading@10:         .name         = "default",
yading@10:         .type         = AVMEDIA_TYPE_VIDEO,
yading@10:         .filter_frame = filter_frame,
yading@10:         .config_props = config_props,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_hflip_outputs[] = {
yading@10:     {
yading@10:         .name = "default",
yading@10:         .type = AVMEDIA_TYPE_VIDEO,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_hflip = {
yading@10:     .name      = "hflip",
yading@10:     .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
yading@10:     .priv_size = sizeof(FlipContext),
yading@10:     .query_formats = query_formats,
yading@10: 
yading@10:     .inputs    = avfilter_vf_hflip_inputs,
yading@10:     .outputs   = avfilter_vf_hflip_outputs,
yading@10: };