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 FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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)
  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_YUV444P16LE,  PIX_FMT_YUV444P16BE,
  76         PIX_FMT_NV12,         PIX_FMT_NV21,
  77         PIX_FMT_RGB8,         PIX_FMT_BGR8,
  78         PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
  79         PIX_FMT_YUV444P,      PIX_FMT_YUVJ444P,
  80         PIX_FMT_YUV420P,      PIX_FMT_YUVJ420P,
  81         PIX_FMT_YUV410P,
  82         PIX_FMT_YUVA420P,     PIX_FMT_GRAY8,
  83         PIX_FMT_NONE
  84     };
  85
  86     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
  87     return 0;
  88 }
  89
  90 static int config_props_output(AVFilterLink *outlink)
  91 {
  92     AVFilterContext *ctx = outlink->src;
  93     TransContext *trans = ctx->priv;
  94     AVFilterLink *inlink = ctx->inputs[0];
  95     const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
  96
  97     trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
  98     trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
  99
 100     av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
 101
 102     outlink->w = inlink->h;
 103     outlink->h = inlink->w;
 104
 105     if (inlink->sample_aspect_ratio.num){
 106         outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
 107     } else
 108         outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
 109
 110     av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
 111            inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
 112            trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
 113            trans->dir == 0 || trans->dir == 3);
 114     return 0;
 115 }
 116
 117 static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 118 {
 119     AVFilterLink *outlink = inlink->dst->outputs[0];
 120     AVFilterBufferRef *buf_out;
 121
 122     outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
 123                                            outlink->w, outlink->h);
 124     if (!outlink->out_buf)
 125         return AVERROR(ENOMEM);
 126
 127     outlink->out_buf->pts = picref->pts;
 128
 129     if (picref->video->sample_aspect_ratio.num == 0) {
 130         outlink->out_buf->video->sample_aspect_ratio = picref->video->sample_aspect_ratio;
 131     } else {
 132         outlink->out_buf->video->sample_aspect_ratio.num = picref->video->sample_aspect_ratio.den;
 133         outlink->out_buf->video->sample_aspect_ratio.den = picref->video->sample_aspect_ratio.num;
 134     }
 135
 136     buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
 137     if (!buf_out)
 138         return AVERROR(ENOMEM);
 139     return ff_start_frame(outlink, buf_out);
 140 }
 141
 142 static int end_frame(AVFilterLink *inlink)
 143 {
 144     TransContext *trans = inlink->dst->priv;
 145     AVFilterBufferRef *inpic  = inlink->cur_buf;
 146     AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
 147     AVFilterLink *outlink = inlink->dst->outputs[0];
 148     int plane, ret;
 149
 150     for (plane = 0; outpic->data[plane]; plane++) {
 151         int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
 152         int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
 153         int pixstep = trans->pixsteps[plane];
 154         int inh  = inpic->video->h>>vsub;
 155         int outw = outpic->video->w>>hsub;
 156         int outh = outpic->video->h>>vsub;
 157         uint8_t *out, *in;
 158         int outlinesize, inlinesize;
 159         int x, y;
 160
 161         out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
 162         in  = inpic ->data[plane]; inlinesize  = inpic ->linesize[plane];
 163
 164         if (trans->dir&1) {
 165             in +=  inpic->linesize[plane] * (inh-1);
 166             inlinesize *= -1;
 167         }
 168
 169         if (trans->dir&2) {
 170             out += outpic->linesize[plane] * (outh-1);
 171             outlinesize *= -1;
 172         }
 173
 174         for (y = 0; y < outh; y++) {
 175             switch (pixstep) {
 176             case 1:
 177                 for (x = 0; x < outw; x++)
 178                     out[x] = in[x*inlinesize + y];
 179                 break;
 180             case 2:
 181                 for (x = 0; x < outw; x++)
 182                     *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
 183                 break;
 184             case 3:
 185                 for (x = 0; x < outw; x++) {
 186                     int32_t v = AV_RB24(in + x*inlinesize + y*3);
 187                     AV_WB24(out + 3*x, v);
 188                 }
 189                 break;
 190             case 4:
 191                 for (x = 0; x < outw; x++)
 192                     *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
 193                 break;
 194             }
 195             out += outlinesize;
 196         }
 197     }
 198
 199     if ((ret = ff_draw_slice(outlink, 0, outpic->video->h, 1)) < 0 ||
 200         (ret = ff_end_frame(outlink)) < 0)
 201         return ret;
 202     return 0;
 203 }
 204
 205 static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 206
 207 AVFilter avfilter_vf_transpose = {
 208     .name      = "transpose",
 209     .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
 210
 211     .init = init,
 212     .priv_size = sizeof(TransContext),
 213
 214     .query_formats = query_formats,
 215
 216     .inputs    = (const AVFilterPad[]) {{ .name            = "default",
 217                                           .type            = AVMEDIA_TYPE_VIDEO,
 218                                           .start_frame     = start_frame,
 219                                           .draw_slice      = null_draw_slice,
 220                                           .end_frame       = end_frame,
 221                                           .min_perms       = AV_PERM_READ, },
 222                                         { .name = NULL}},
 223     .outputs   = (const AVFilterPad[]) {{ .name            = "default",
 224                                           .config_props    = config_props_output,
 225                                           .type            = AVMEDIA_TYPE_VIDEO, },
 226                                         { .name = NULL}},
 227 };