ffmpeg/libavfilter/vf_format.c

   1 /*
   2  * Copyright (c) 2007 Bobby Bingham
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * format and noformat video filters
  24  */
  25
  26 #include <string.h>
  27
  28 #include "libavutil/internal.h"
  29 #include "libavutil/mem.h"
  30 #include "libavutil/pixdesc.h"
  31 #include "libavutil/opt.h"
  32
  33 #include "avfilter.h"
  34 #include "formats.h"
  35 #include "internal.h"
  36 #include "video.h"
  37
  38 typedef struct FormatContext {
  39     const AVClass *class;
  40     char *pix_fmts;
  41
  42     /**
  43      * pix_fmts parsed into AVPixelFormats and terminated with
  44      * AV_PIX_FMT_NONE
  45      */
  46     enum AVPixelFormat *formats;
  47 } FormatContext;
  48
  49 static av_cold void uninit(AVFilterContext *ctx)
  50 {
  51     FormatContext *s = ctx->priv;
  52     av_freep(&s->formats);
  53 }
  54
  55 static av_cold int init(AVFilterContext *ctx)
  56 {
  57     FormatContext *s = ctx->priv;
  58     char *cur, *sep;
  59     int nb_formats = 1;
  60     int i;
  61     int ret;
  62
  63     if (!s->pix_fmts)
  64         return AVERROR(EINVAL);
  65
  66     /* count the formats */
  67     cur = s->pix_fmts;
  68     while ((cur = strchr(cur, '|'))) {
  69         nb_formats++;
  70         if (*cur)
  71             cur++;
  72     }
  73
  74     s->formats = av_malloc_array(nb_formats + 1, sizeof(*s->formats));
  75     if (!s->formats)
  76         return AVERROR(ENOMEM);
  77
  78     /* parse the list of formats */
  79     cur = s->pix_fmts;
  80     for (i = 0; i < nb_formats; i++) {
  81         sep = strchr(cur, '|');
  82         if (sep)
  83             *sep++ = 0;
  84
  85         if ((ret = ff_parse_pixel_format(&s->formats[i], cur, ctx)) < 0)
  86             return ret;
  87
  88         cur = sep;
  89     }
  90     s->formats[nb_formats] = AV_PIX_FMT_NONE;
  91
  92     if (!strcmp(ctx->filter->name, "noformat")) {
  93         const AVPixFmtDescriptor *desc = NULL;
  94         enum AVPixelFormat *formats_allowed;
  95         int nb_formats_lavu = 0, nb_formats_allowed = 0;
  96
  97         /* count the formats known to lavu */
  98         while ((desc = av_pix_fmt_desc_next(desc)))
  99             nb_formats_lavu++;
 100
 101         formats_allowed = av_malloc_array(nb_formats_lavu + 1, sizeof(*formats_allowed));
 102         if (!formats_allowed)
 103             return AVERROR(ENOMEM);
 104
 105         /* for each format known to lavu, check if it's in the list of
 106          * forbidden formats */
 107         while ((desc = av_pix_fmt_desc_next(desc))) {
 108             enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(desc);
 109
 110             for (i = 0; i < nb_formats; i++) {
 111                 if (s->formats[i] == pix_fmt)
 112                     break;
 113             }
 114             if (i < nb_formats)
 115                 continue;
 116
 117             formats_allowed[nb_formats_allowed++] = pix_fmt;
 118         }
 119         formats_allowed[nb_formats_allowed] = AV_PIX_FMT_NONE;
 120         av_freep(&s->formats);
 121         s->formats = formats_allowed;
 122     }
 123
 124     return 0;
 125 }
 126
 127 static int query_formats(AVFilterContext *ctx)
 128 {
 129     FormatContext *s = ctx->priv;
 130     AVFilterFormats *formats = ff_make_format_list(s->formats);
 131
 132     if (!formats)
 133         return AVERROR(ENOMEM);
 134
 135     ff_set_common_formats(ctx, formats);
 136     return 0;
 137 }
 138
 139
 140 #define OFFSET(x) offsetof(FormatContext, x)
 141 static const AVOption options[] = {
 142     { "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM },
 143     { NULL }
 144 };
 145
 146 #if CONFIG_FORMAT_FILTER
 147
 148 #define format_options options
 149 AVFILTER_DEFINE_CLASS(format);
 150
 151 static const AVFilterPad avfilter_vf_format_inputs[] = {
 152     {
 153         .name             = "default",
 154         .type             = AVMEDIA_TYPE_VIDEO,
 155         .get_video_buffer = ff_null_get_video_buffer,
 156     },
 157     { NULL }
 158 };
 159
 160 static const AVFilterPad avfilter_vf_format_outputs[] = {
 161     {
 162         .name = "default",
 163         .type = AVMEDIA_TYPE_VIDEO
 164     },
 165     { NULL }
 166 };
 167
 168 AVFilter ff_vf_format = {
 169     .name          = "format",
 170     .description   = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
 171
 172     .init          = init,
 173     .uninit        = uninit,
 174
 175     .query_formats = query_formats,
 176
 177     .priv_size     = sizeof(FormatContext),
 178     .priv_class    = &format_class,
 179
 180     .inputs        = avfilter_vf_format_inputs,
 181     .outputs       = avfilter_vf_format_outputs,
 182 };
 183 #endif /* CONFIG_FORMAT_FILTER */
 184
 185 #if CONFIG_NOFORMAT_FILTER
 186
 187 #define noformat_options options
 188 AVFILTER_DEFINE_CLASS(noformat);
 189
 190 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
 191     {
 192         .name             = "default",
 193         .type             = AVMEDIA_TYPE_VIDEO,
 194         .get_video_buffer = ff_null_get_video_buffer,
 195     },
 196     { NULL }
 197 };
 198
 199 static const AVFilterPad avfilter_vf_noformat_outputs[] = {
 200     {
 201         .name = "default",
 202         .type = AVMEDIA_TYPE_VIDEO
 203     },
 204     { NULL }
 205 };
 206
 207 AVFilter ff_vf_noformat = {
 208     .name          = "noformat",
 209     .description   = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
 210
 211     .init          = init,
 212     .uninit        = uninit,
 213
 214     .query_formats = query_formats,
 215
 216     .priv_size     = sizeof(FormatContext),
 217     .priv_class    = &noformat_class,
 218
 219     .inputs        = avfilter_vf_noformat_inputs,
 220     .outputs       = avfilter_vf_noformat_outputs,
 221 };
 222 #endif /* CONFIG_NOFORMAT_FILTER */