git.sesse.net Git - ffmpeg/blob - libavfilter/vf_transpose.c

   1 /*
   2  * Copyright (c) 2010 Stefano Sabatini
   3  * Copyright (c) 2008 Vitor Sessak
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * transposition filter
  25  * Based on MPlayer libmpcodecs/vf_rotate.c.
  26  */
  27
  28 #include "libavutil/intreadwrite.h"
  29 #include "libavutil/pixdesc.h"
  30 #include "libavutil/imgutils.h"
  31 #include "avfilter.h"
  32 #include "formats.h"
  33
  34 typedef struct {
  35     int hsub, vsub;
  36     int pixsteps[4];
  37
  38     /* 0    Rotate by 90 degrees counterclockwise and vflip. */
  39     /* 1    Rotate by 90 degrees clockwise.                  */
  40     /* 2    Rotate by 90 degrees counterclockwise.           */
  41     /* 3    Rotate by 90 degrees clockwise and vflip.        */
  42     int dir;
  43 } TransContext;
  44
  45 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  46 {
  47     TransContext *trans = ctx->priv;
  48     trans->dir = 0;
  49
  50     if (args)
  51         sscanf(args, "%d", &trans->dir);
  52
  53     if (trans->dir < 0 || trans->dir > 3) {
  54         av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
  55                trans->dir);
  56         return AVERROR(EINVAL);
  57     }
  58     return 0;
  59 }
  60
  61 static int query_formats(AVFilterContext *ctx)
  62 {
  63     enum PixelFormat pix_fmts[] = {
  64         PIX_FMT_ARGB,         PIX_FMT_RGBA,
  65         PIX_FMT_ABGR,         PIX_FMT_BGRA,
  66         PIX_FMT_RGB24,        PIX_FMT_BGR24,
  67         PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
  68         PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
  69         PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
  70         PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
  71         PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
  72         PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
  73         PIX_FMT_YUV422P16LE,  PIX_FMT_YUV422P16BE,
  74         PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
  75         PIX_FMT_NV12,         PIX_FMT_NV21,
  76         PIX_FMT_RGB8,         PIX_FMT_BGR8,
  77         PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
  78         PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
  79         PIX_FMT_YUV420P,      PIX_FMT_YUVJ420P,
  80         PIX_FMT_YUV411P,      PIX_FMT_YUV410P,
  81         PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
  82         PIX_FMT_YUV440P,      PIX_FMT_YUVJ440P,
  83         PIX_FMT_YUVA420P,     PIX_FMT_GRAY8,
  84         PIX_FMT_NONE
  85     };
  86
  87     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
  88     return 0;
  89 }
  90
  91 static int config_props_output(AVFilterLink *outlink)
  92 {
  93     AVFilterContext *ctx = outlink->src;
  94     TransContext *trans = ctx->priv;
  95     AVFilterLink *inlink = ctx->inputs[0];
  96     const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
  97
  98     trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
  99     trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
 100
 101     av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
 102
 103     outlink->w = inlink->h;
 104     outlink->h = inlink->w;
 105
 106     if (inlink->sample_aspect_ratio.num){
 107         outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
 108     } else
 109         outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
 110
 111     av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
 112            inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
 113            trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
 114            trans->dir == 0 || trans->dir == 3);
 115     return 0;
 116 }
 117
 118 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 119 {
 120     AVFilterLink *outlink = inlink->dst->outputs[0];
 121
 122     outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
 123                                                  outlink->w, outlink->h);
 124     outlink->out_buf->pts = picref->pts;
 125
 126     if (picref->video->pixel_aspect.num == 0) {
 127         outlink->out_buf->video->pixel_aspect = picref->video->pixel_aspect;
 128     } else {
 129         outlink->out_buf->video->pixel_aspect.num = picref->video->pixel_aspect.den;
 130         outlink->out_buf->video->pixel_aspect.den = picref->video->pixel_aspect.num;
 131     }
 132
 133     avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
 134 }
 135
 136 static void end_frame(AVFilterLink *inlink)
 137 {
 138     TransContext *trans = inlink->dst->priv;
 139     AVFilterBufferRef *inpic  = inlink->cur_buf;
 140     AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
 141     AVFilterLink *outlink = inlink->dst->outputs[0];
 142     int plane;
 143
 144     for (plane = 0; outpic->data[plane]; plane++) {
 145         int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
 146         int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
 147         int pixstep = trans->pixsteps[plane];
 148         int inh  = inpic->video->h>>vsub;
 149         int outw = outpic->video->w>>hsub;
 150         int outh = outpic->video->h>>vsub;
 151         uint8_t *out, *in;
 152         int outlinesize, inlinesize;
 153         int x, y;
 154
 155         out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
 156         in  = inpic ->data[plane]; inlinesize  = inpic ->linesize[plane];
 157
 158         if (trans->dir&1) {
 159             in +=  inpic->linesize[plane] * (inh-1);
 160             inlinesize *= -1;
 161         }
 162
 163         if (trans->dir&2) {
 164             out += outpic->linesize[plane] * (outh-1);
 165             outlinesize *= -1;
 166         }
 167
 168         for (y = 0; y < outh; y++) {
 169             switch (pixstep) {
 170             case 1:
 171                 for (x = 0; x < outw; x++)
 172                     out[x] = in[x*inlinesize + y];
 173                 break;
 174             case 2:
 175                 for (x = 0; x < outw; x++)
 176                     *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
 177                 break;
 178             case 3:
 179                 for (x = 0; x < outw; x++) {
 180                     int32_t v = AV_RB24(in + x*inlinesize + y*3);
 181                     AV_WB24(out + 3*x, v);
 182                 }
 183                 break;
 184             case 4:
 185                 for (x = 0; x < outw; x++)
 186                     *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
 187                 break;
 188             }
 189             out += outlinesize;
 190         }
 191     }
 192
 193     avfilter_unref_buffer(inpic);
 194     avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
 195     avfilter_end_frame(outlink);
 196     avfilter_unref_buffer(outpic);
 197 }
 198
 199 AVFilter avfilter_vf_transpose = {
 200     .name      = "transpose",
 201     .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
 202
 203     .init = init,
 204     .priv_size = sizeof(TransContext),
 205
 206     .query_formats = query_formats,
 207
 208     .inputs    = (AVFilterPad[]) {{ .name            = "default",
 209                                     .type            = AVMEDIA_TYPE_VIDEO,
 210                                     .start_frame     = start_frame,
 211                                     .end_frame       = end_frame,
 212                                     .min_perms       = AV_PERM_READ, },
 213                                   { .name = NULL}},
 214     .outputs   = (AVFilterPad[]) {{ .name            = "default",
 215                                     .config_props    = config_props_output,
 216                                     .type            = AVMEDIA_TYPE_VIDEO, },
 217                                   { .name = NULL}},
 218 };