| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2003 Rich Felker | ||
| 3 | * Copyright (c) 2012 Stefano Sabatini | ||
| 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 | * field filter, based on libmpcodecs/vf_field.c by Rich Felker | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/opt.h" | ||
| 28 | #include "libavutil/pixdesc.h" | ||
| 29 | #include "avfilter.h" | ||
| 30 | #include "filters.h" | ||
| 31 | |||
| 32 | enum FieldType { FIELD_TYPE_TOP = 0, FIELD_TYPE_BOTTOM }; | ||
| 33 | |||
| 34 | typedef struct FieldContext { | ||
| 35 | const AVClass *class; | ||
| 36 | int type; ///< FieldType | ||
| 37 | int nb_planes; ///< number of planes of the current format | ||
| 38 | } FieldContext; | ||
| 39 | |||
| 40 | #define OFFSET(x) offsetof(FieldContext, x) | ||
| 41 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | ||
| 42 | |||
| 43 | static const AVOption field_options[] = { | ||
| 44 | {"type", "set field type (top or bottom)", OFFSET(type), AV_OPT_TYPE_INT, {.i64=FIELD_TYPE_TOP}, 0, 1, FLAGS, .unit = "field_type" }, | ||
| 45 | {"top", "select top field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_TOP}, INT_MIN, INT_MAX, FLAGS, .unit = "field_type"}, | ||
| 46 | {"bottom", "select bottom field", 0, AV_OPT_TYPE_CONST, {.i64=FIELD_TYPE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, .unit = "field_type"}, | ||
| 47 | {NULL} | ||
| 48 | }; | ||
| 49 | |||
| 50 | AVFILTER_DEFINE_CLASS(field); | ||
| 51 | |||
| 52 | 195 | static int config_props_output(AVFilterLink *outlink) | |
| 53 | { | ||
| 54 | 195 | AVFilterContext *ctx = outlink->src; | |
| 55 | 195 | FieldContext *field = ctx->priv; | |
| 56 | 195 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 57 | |||
| 58 | 195 | field->nb_planes = av_pix_fmt_count_planes(outlink->format); | |
| 59 | |||
| 60 | 195 | outlink->w = inlink->w; | |
| 61 | 195 | outlink->h = (inlink->h + (field->type == FIELD_TYPE_TOP)) / 2; | |
| 62 | |||
| 63 | 195 | av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d type:%s -> w:%d h:%d\n", | |
| 64 |
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195 | inlink->w, inlink->h, field->type == FIELD_TYPE_BOTTOM ? "bottom" : "top", |
| 65 | outlink->w, outlink->h); | ||
| 66 | 195 | return 0; | |
| 67 | } | ||
| 68 | |||
| 69 | 195 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) | |
| 70 | { | ||
| 71 | 195 | FieldContext *field = inlink->dst->priv; | |
| 72 | 195 | AVFilterLink *outlink = inlink->dst->outputs[0]; | |
| 73 | int i; | ||
| 74 | |||
| 75 | 195 | inpicref->height = outlink->h; | |
| 76 | 195 | inpicref->flags &= ~AV_FRAME_FLAG_INTERLACED; | |
| 77 | |||
| 78 |
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639 | for (i = 0; i < field->nb_planes; i++) { |
| 79 |
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444 | if (field->type == FIELD_TYPE_BOTTOM) |
| 80 | 444 | inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i]; | |
| 81 | 444 | inpicref->linesize[i] = 2 * inpicref->linesize[i]; | |
| 82 | } | ||
| 83 | 195 | return ff_filter_frame(outlink, inpicref); | |
| 84 | } | ||
| 85 | |||
| 86 | static const AVFilterPad field_inputs[] = { | ||
| 87 | { | ||
| 88 | .name = "default", | ||
| 89 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 90 | .filter_frame = filter_frame, | ||
| 91 | }, | ||
| 92 | }; | ||
| 93 | |||
| 94 | static const AVFilterPad field_outputs[] = { | ||
| 95 | { | ||
| 96 | .name = "default", | ||
| 97 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 98 | .config_props = config_props_output, | ||
| 99 | }, | ||
| 100 | }; | ||
| 101 | |||
| 102 | const FFFilter ff_vf_field = { | ||
| 103 | .p.name = "field", | ||
| 104 | .p.description = NULL_IF_CONFIG_SMALL("Extract a field from the input video."), | ||
| 105 | .p.priv_class = &field_class, | ||
| 106 | .priv_size = sizeof(FieldContext), | ||
| 107 | FILTER_INPUTS(field_inputs), | ||
| 108 | FILTER_OUTPUTS(field_outputs), | ||
| 109 | }; | ||
| 110 |