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 #include "internal.h"
  34 #include "video.h"
  35
  36 typedef struct {
  37     int hsub, vsub;
  38     int pixsteps[4];
  39
  40     /* 0    Rotate by 90 degrees counterclockwise and vflip. */
  41     /* 1    Rotate by 90 degrees clockwise.                  */
  42     /* 2    Rotate by 90 degrees counterclockwise.           */
  43     /* 3    Rotate by 90 degrees clockwise and vflip.        */
  44     int dir;
  45 } TransContext;
  46
  47 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  48 {
  49     TransContext *trans = ctx->priv;
  50     trans->dir = 0;
  51
  52     if (args)
  53         sscanf(args, "%d", &trans->dir);
  54
  55     if (trans->dir < 0 || trans->dir > 3) {
  56         av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
  57                trans->dir);
  58         return AVERROR(EINVAL);
  59     }
  60     return 0;
  61 }
  62
  63 static int query_formats(AVFilterContext *ctx)
  64 {
  65     enum PixelFormat pix_fmts[] = {
  66         PIX_FMT_ARGB,         PIX_FMT_RGBA,
  67         PIX_FMT_ABGR,         PIX_FMT_BGRA,
  68         PIX_FMT_RGB24,        PIX_FMT_BGR24,
  69         PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
  70         PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
  71         PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
  72         PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
  73         PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
  74         PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
  75         PIX_FMT_YUV422P16LE,  PIX_FMT_YUV422P16BE,
  76         PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
  77         PIX_FMT_NV12,         PIX_FMT_NV21,
  78         PIX_FMT_RGB8,         PIX_FMT_BGR8,
  79         PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
  80         PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
  81         PIX_FMT_YUV420P,      PIX_FMT_YUVJ420P,
  82         PIX_FMT_YUV411P,      PIX_FMT_YUV410P,
  83         PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
  84         PIX_FMT_YUV440P,      PIX_FMT_YUVJ440P,
  85         PIX_FMT_YUVA420P,     PIX_FMT_GRAY8,
  86         PIX_FMT_NONE
  87     };
  88
  89     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
  90     return 0;
  91 }
  92
  93 static int config_props_output(AVFilterLink *outlink)
  94 {
  95     AVFilterContext *ctx = outlink->src;
  96     TransContext *trans = ctx->priv;
  97     AVFilterLink *inlink = ctx->inputs[0];
  98     const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
  99
 100     trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
 101     trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
 102
 103     av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
 104
 105     outlink->w = inlink->h;
 106     outlink->h = inlink->w;
 107
 108     if (inlink->sample_aspect_ratio.num){
 109         outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
 110     } else
 111         outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
 112
 113     av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
 114            inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
 115            trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
 116            trans->dir == 0 || trans->dir == 3);
 117     return 0;
 118 }
 119
 120 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 121 {
 122     AVFilterLink *outlink = inlink->dst->outputs[0];
 123
 124     outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
 125                                            outlink->w, outlink->h);
 126     outlink->out_buf->pts = picref->pts;
 127
 128     if (picref->video->pixel_aspect.num == 0) {
 129         outlink->out_buf->video->pixel_aspect = picref->video->pixel_aspect;
 130     } else {
 131         outlink->out_buf->video->pixel_aspect.num = picref->video->pixel_aspect.den;
 132         outlink->out_buf->video->pixel_aspect.den = picref->video->pixel_aspect.num;
 133     }
 134
 135     ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
 136 }
 137
 138 static void end_frame(AVFilterLink *inlink)
 139 {
 140     TransContext *trans = inlink->dst->priv;
 141     AVFilterBufferRef *inpic  = inlink->cur_buf;
 142     AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
 143     AVFilterLink *outlink = inlink->dst->outputs[0];
 144     int plane;
 145
 146     for (plane = 0; outpic->data[plane]; plane++) {
 147         int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
 148         int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
 149         int pixstep = trans->pixsteps[plane];
 150         int inh  = inpic->video->h>>vsub;
 151         int outw = outpic->video->w>>hsub;
 152         int outh = outpic->video->h>>vsub;
 153         uint8_t *out, *in;
 154         int outlinesize, inlinesize;
 155         int x, y;
 156
 157         out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
 158         in  = inpic ->data[plane]; inlinesize  = inpic ->linesize[plane];
 159
 160         if (trans->dir&1) {
 161             in +=  inpic->linesize[plane] * (inh-1);
 162             inlinesize *= -1;
 163         }
 164
 165         if (trans->dir&2) {
 166             out += outpic->linesize[plane] * (outh-1);
 167             outlinesize *= -1;
 168         }
 169
 170         for (y = 0; y < outh; y++) {
 171             switch (pixstep) {
 172             case 1:
 173                 for (x = 0; x < outw; x++)
 174                     out[x] = in[x*inlinesize + y];
 175                 break;
 176             case 2:
 177                 for (x = 0; x < outw; x++)
 178                     *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
 179                 break;
 180             case 3:
 181                 for (x = 0; x < outw; x++) {
 182                     int32_t v = AV_RB24(in + x*inlinesize + y*3);
 183                     AV_WB24(out + 3*x, v);
 184                 }
 185                 break;
 186             case 4:
 187                 for (x = 0; x < outw; x++)
 188                     *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
 189                 break;
 190             }
 191             out += outlinesize;
 192         }
 193     }
 194
 195     avfilter_unref_buffer(inpic);
 196     ff_draw_slice(outlink, 0, outpic->video->h, 1);
 197     ff_end_frame(outlink);
 198     avfilter_unref_buffer(outpic);
 199 }
 200
 201 AVFilter avfilter_vf_transpose = {
 202     .name      = "transpose",
 203     .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
 204
 205     .init = init,
 206     .priv_size = sizeof(TransContext),
 207
 208     .query_formats = query_formats,
 209
 210     .inputs    = (AVFilterPad[]) {{ .name            = "default",
 211                                     .type            = AVMEDIA_TYPE_VIDEO,
 212                                     .start_frame     = start_frame,
 213                                     .end_frame       = end_frame,
 214                                     .min_perms       = AV_PERM_READ, },
 215                                   { .name = NULL}},
 216     .outputs   = (AVFilterPad[]) {{ .name            = "default",
 217                                     .config_props    = config_props_output,
 218                                     .type            = AVMEDIA_TYPE_VIDEO, },
 219                                   { .name = NULL}},
 220 };