| 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 */ |