libavfilter/vf_shuffleplanes.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "libavutil/avstring.h"
  20 #include "libavutil/common.h"
  21 #include "libavutil/internal.h"
  22 #include "libavutil/opt.h"
  23 #include "libavutil/pixdesc.h"
  24 #include "libavutil/pixfmt.h"
  25
  26 #include "avfilter.h"
  27 #include "internal.h"
  28 #include "video.h"
  29
  30 typedef struct ShufflePlanesContext {
  31     const AVClass *class;
  32
  33     /* number of planes in the selected pixel format */
  34     int planes;
  35
  36     /* mapping indices */
  37     int map[4];
  38
  39     /* set to 1 if some plane is used more than once, so we need to make a copy */
  40     int copy;
  41 } ShufflePlanesContext;
  42
  43 static av_cold int shuffleplanes_config_input(AVFilterLink *inlink)
  44 {
  45     AVFilterContext    *ctx = inlink->dst;
  46     ShufflePlanesContext *s = ctx->priv;
  47     const AVPixFmtDescriptor *desc;
  48     int used[4] = { 0 };
  49     int i;
  50
  51     s->copy   = 0;
  52     s->planes = av_pix_fmt_count_planes(inlink->format);
  53     desc      = av_pix_fmt_desc_get(inlink->format);
  54
  55     for (i = 0; i < s->planes; i++) {
  56         if (s->map[i] >= s->planes) {
  57             av_log(ctx, AV_LOG_ERROR,
  58                    "Non-existing input plane #%d mapped to output plane #%d.\n",
  59                    s->map[i], i);
  60             return AVERROR(EINVAL);
  61         }
  62
  63         if ((desc->log2_chroma_h || desc->log2_chroma_w) &&
  64             (i == 1 || i == 2) != (s->map[i] == 1 || s->map[i] == 2)) {
  65             av_log(ctx, AV_LOG_ERROR,
  66                    "Cannot map between a subsampled chroma plane and a luma "
  67                    "or alpha plane.\n");
  68             return AVERROR(EINVAL);
  69         }
  70
  71         if ((desc->flags & AV_PIX_FMT_FLAG_PAL ||
  72              desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) &&
  73             (i == 1) != (s->map[i] == 1)) {
  74             av_log(ctx, AV_LOG_ERROR,
  75                    "Cannot map between a palette plane and a data plane.\n");
  76             return AVERROR(EINVAL);
  77         }
  78         if (used[s->map[i]])
  79             s->copy = 1;
  80         used[s->map[i]]++;
  81     }
  82
  83     return 0;
  84 }
  85
  86 static int shuffleplanes_filter_frame(AVFilterLink *inlink, AVFrame *frame)
  87 {
  88     AVFilterContext          *ctx = inlink->dst;
  89     ShufflePlanesContext       *s = ctx->priv;
  90     uint8_t *shuffled_data[4]     = { NULL };
  91     int      shuffled_linesize[4] = { 0 };
  92     int i, ret;
  93
  94     for (i = 0; i < s->planes; i++) {
  95         shuffled_data[i]     = frame->data[s->map[i]];
  96         shuffled_linesize[i] = frame->linesize[s->map[i]];
  97     }
  98     memcpy(frame->data,     shuffled_data,     sizeof(shuffled_data));
  99     memcpy(frame->linesize, shuffled_linesize, sizeof(shuffled_linesize));
 100
 101     if (s->copy) {
 102         AVFrame *copy = ff_get_video_buffer(ctx->outputs[0], frame->width, frame->height);
 103
 104         if (!copy) {
 105             ret = AVERROR(ENOMEM);
 106             goto fail;
 107         }
 108
 109         av_frame_copy(copy, frame);
 110
 111         ret = av_frame_copy_props(copy, frame);
 112         if (ret < 0) {
 113             av_frame_free(&copy);
 114             goto fail;
 115         }
 116
 117         av_frame_free(&frame);
 118         frame = copy;
 119     }
 120
 121     return ff_filter_frame(ctx->outputs[0], frame);
 122 fail:
 123     av_frame_free(&frame);
 124     return ret;
 125 }
 126
 127 #define OFFSET(x) offsetof(ShufflePlanesContext, x)
 128 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
 129 static const AVOption shuffleplanes_options[] = {
 130     { "map0", "Index of the input plane to be used as the first output plane ",  OFFSET(map[0]), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, FLAGS },
 131     { "map1", "Index of the input plane to be used as the second output plane ", OFFSET(map[1]), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 4, FLAGS },
 132     { "map2", "Index of the input plane to be used as the third output plane ",  OFFSET(map[2]), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, 4, FLAGS },
 133     { "map3", "Index of the input plane to be used as the fourth output plane ", OFFSET(map[3]), AV_OPT_TYPE_INT, { .i64 = 3 }, 0, 4, FLAGS },
 134     { NULL },
 135 };
 136
 137 static const AVClass shuffleplanes_class = {
 138     .class_name = "shuffleplanes",
 139     .item_name  = av_default_item_name,
 140     .option     = shuffleplanes_options,
 141     .version    = LIBAVUTIL_VERSION_INT,
 142 };
 143
 144 static const AVFilterPad shuffleplanes_inputs[] = {
 145     {
 146         .name             = "default",
 147         .type             = AVMEDIA_TYPE_VIDEO,
 148         .config_props     = shuffleplanes_config_input,
 149         .filter_frame     = shuffleplanes_filter_frame,
 150         .get_video_buffer = ff_null_get_video_buffer,
 151     },
 152     { NULL },
 153 };
 154
 155 static const AVFilterPad shuffleplanes_outputs[] = {
 156     {
 157         .name = "default",
 158         .type = AVMEDIA_TYPE_VIDEO,
 159     },
 160     { NULL },
 161 };
 162
 163 AVFilter ff_vf_shuffleplanes = {
 164     .name         = "shuffleplanes",
 165     .description  = NULL_IF_CONFIG_SMALL("Shuffle video planes"),
 166
 167     .priv_size    = sizeof(ShufflePlanesContext),
 168     .priv_class   = &shuffleplanes_class,
 169
 170     .inputs       = shuffleplanes_inputs,
 171     .outputs      = shuffleplanes_outputs,
 172 };