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 "libavutil/pixdesc.h"
  27 #include "avfilter.h"
  28
  29 typedef struct {
  30     /**
  31      * List of flags telling if a given image format has been listed
  32      * as argument to the filter.
  33      */
  34     int listed_pix_fmt_flags[PIX_FMT_NB];
  35 } FormatContext;
  36
  37 #define PIX_FMT_NAME_MAXSIZE 32
  38
  39 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  40 {
  41     FormatContext *format = ctx->priv;
  42     const char *cur, *sep;
  43     char             pix_fmt_name[PIX_FMT_NAME_MAXSIZE];
  44     int              pix_fmt_name_len;
  45     enum PixelFormat pix_fmt;
  46
  47     /* parse the list of formats */
  48     for (cur = args; cur; cur = sep ? sep+1 : NULL) {
  49         if (!(sep = strchr(cur, ':')))
  50             pix_fmt_name_len = strlen(cur);
  51         else
  52             pix_fmt_name_len = sep - cur;
  53         if (pix_fmt_name_len >= PIX_FMT_NAME_MAXSIZE) {
  54             av_log(ctx, AV_LOG_ERROR, "Format name too long\n");
  55             return -1;
  56         }
  57
  58         memcpy(pix_fmt_name, cur, pix_fmt_name_len);
  59         pix_fmt_name[pix_fmt_name_len] = 0;
  60         pix_fmt = av_get_pix_fmt(pix_fmt_name);
  61
  62         if (pix_fmt == PIX_FMT_NONE) {
  63             av_log(ctx, AV_LOG_ERROR, "Unknown pixel format: %s\n", pix_fmt_name);
  64             return -1;
  65         }
  66
  67         format->listed_pix_fmt_flags[pix_fmt] = 1;
  68     }
  69
  70     return 0;
  71 }
  72
  73 static AVFilterFormats *make_format_list(FormatContext *format, int flag)
  74 {
  75     AVFilterFormats *formats;
  76     enum PixelFormat pix_fmt;
  77
  78     formats = av_mallocz(sizeof(AVFilterFormats));
  79     formats->formats = av_malloc(sizeof(enum PixelFormat) * PIX_FMT_NB);
  80
  81     for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
  82         if (format->listed_pix_fmt_flags[pix_fmt] == flag)
  83             formats->formats[formats->format_count++] = pix_fmt;
  84
  85     return formats;
  86 }
  87
  88 #if CONFIG_FORMAT_FILTER
  89 static int query_formats_format(AVFilterContext *ctx)
  90 {
  91     avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 1));
  92     return 0;
  93 }
  94
  95 AVFilter avfilter_vf_format = {
  96     .name      = "format",
  97     .description = "Convert the input video to one of the specified pixel formats.",
  98
  99     .init      = init,
 100
 101     .query_formats = query_formats_format,
 102
 103     .priv_size = sizeof(FormatContext),
 104
 105     .inputs    = (AVFilterPad[]) {{ .name            = "default",
 106                                     .type            = AVMEDIA_TYPE_VIDEO,
 107                                     .get_video_buffer= avfilter_null_get_video_buffer,
 108                                     .start_frame     = avfilter_null_start_frame,
 109                                     .draw_slice      = avfilter_null_draw_slice,
 110                                     .end_frame       = avfilter_null_end_frame, },
 111                                   { .name = NULL}},
 112     .outputs   = (AVFilterPad[]) {{ .name            = "default",
 113                                     .type            = AVMEDIA_TYPE_VIDEO },
 114                                   { .name = NULL}},
 115 };
 116 #endif /* CONFIG_FORMAT_FILTER */
 117
 118 #if CONFIG_NOFORMAT_FILTER
 119 static int query_formats_noformat(AVFilterContext *ctx)
 120 {
 121     avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 0));
 122     return 0;
 123 }
 124
 125 AVFilter avfilter_vf_noformat = {
 126     .name      = "noformat",
 127     .description = "Force libavfilter not to use any of the specified pixel formats for the input to the next filter.",
 128
 129     .init      = init,
 130
 131     .query_formats = query_formats_noformat,
 132
 133     .priv_size = sizeof(FormatContext),
 134
 135     .inputs    = (AVFilterPad[]) {{ .name            = "default",
 136                                     .type            = AVMEDIA_TYPE_VIDEO,
 137                                     .get_video_buffer= avfilter_null_get_video_buffer,
 138                                     .start_frame     = avfilter_null_start_frame,
 139                                     .draw_slice      = avfilter_null_draw_slice,
 140                                     .end_frame       = avfilter_null_end_frame, },
 141                                   { .name = NULL}},
 142     .outputs   = (AVFilterPad[]) {{ .name            = "default",
 143                                     .type            = AVMEDIA_TYPE_VIDEO },
 144                                   { .name = NULL}},
 145 };
 146 #endif /* CONFIG_NOFORMAT_FILTER */
 147