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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2013 Paul B Mahol |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include "libavutil/pixdesc.h" |
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| 22 | #include "avfilter.h" |
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| 23 | #include "internal.h" |
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| 24 | |||
| 25 | typedef struct { |
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| 26 | int nb_planes; |
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| 27 | AVFrame *second; |
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| 28 | } SeparateFieldsContext; |
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| 29 | |||
| 30 | static int config_props_output(AVFilterLink *outlink) |
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| 31 | { |
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| 32 | AVFilterContext *ctx = outlink->src; |
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| 33 | SeparateFieldsContext *sf = ctx->priv; |
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| 34 | AVFilterLink *inlink = ctx->inputs[0]; |
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| 35 | |||
| 36 | sf->nb_planes = av_pix_fmt_count_planes(inlink->format); |
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| 37 | |||
| 38 | if (inlink->h & 1) { |
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| 39 | av_log(ctx, AV_LOG_ERROR, "height must be even\n"); |
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| 40 | return AVERROR_INVALIDDATA; |
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| 41 | } |
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| 42 | |||
| 43 | outlink->time_base.num = inlink->time_base.num; |
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| 44 | outlink->time_base.den = inlink->time_base.den * 2; |
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| 45 | outlink->frame_rate.num = inlink->frame_rate.num * 2; |
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| 46 | outlink->frame_rate.den = inlink->frame_rate.den; |
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| 47 | outlink->w = inlink->w; |
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| 48 | outlink->h = inlink->h / 2; |
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| 49 | |||
| 50 | return 0; |
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| 51 | } |
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| 52 | |||
| 53 | static void extract_field(AVFrame *frame, int nb_planes, int type) |
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| 54 | { |
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| 55 | int i; |
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| 56 | |||
| 57 | for (i = 0; i < nb_planes; i++) { |
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| 58 | if (type) |
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| 59 | frame->data[i] = frame->data[i] + frame->linesize[i]; |
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| 60 | frame->linesize[i] *= 2; |
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| 61 | } |
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| 62 | } |
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| 63 | |||
| 64 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) |
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| 65 | { |
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| 66 | AVFilterContext *ctx = inlink->dst; |
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| 67 | SeparateFieldsContext *sf = ctx->priv; |
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| 68 | AVFilterLink *outlink = ctx->outputs[0]; |
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| 69 | int ret; |
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| 70 | |||
| 71 | inpicref->height = outlink->h; |
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| 72 | inpicref->interlaced_frame = 0; |
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| 73 | |||
| 74 | if (!sf->second) { |
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| 75 | goto clone; |
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| 76 | } else { |
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| 77 | AVFrame *second = sf->second; |
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| 78 | |||
| 79 | extract_field(second, sf->nb_planes, second->top_field_first); |
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| 80 | |||
| 81 | if (second->pts != AV_NOPTS_VALUE && |
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| 82 | inpicref->pts != AV_NOPTS_VALUE) |
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| 83 | second->pts += inpicref->pts; |
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| 84 | else |
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| 85 | second->pts = AV_NOPTS_VALUE; |
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| 86 | |||
| 87 | ret = ff_filter_frame(outlink, second); |
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| 88 | if (ret < 0) |
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| 89 | return ret; |
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| 90 | clone: |
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| 91 | sf->second = av_frame_clone(inpicref); |
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| 92 | if (!sf->second) |
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| 93 | return AVERROR(ENOMEM); |
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| 94 | } |
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| 95 | |||
| 96 | extract_field(inpicref, sf->nb_planes, !inpicref->top_field_first); |
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| 97 | |||
| 98 | if (inpicref->pts != AV_NOPTS_VALUE) |
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| 99 | inpicref->pts *= 2; |
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| 100 | |||
| 101 | return ff_filter_frame(outlink, inpicref); |
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| 102 | } |
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| 103 | |||
| 104 | static int request_frame(AVFilterLink *outlink) |
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| 105 | { |
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| 106 | AVFilterContext *ctx = outlink->src; |
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| 107 | SeparateFieldsContext *sf = ctx->priv; |
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| 108 | int ret; |
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| 109 | |||
| 110 | ret = ff_request_frame(ctx->inputs[0]); |
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| 111 | if (ret == AVERROR_EOF && sf->second) { |
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| 112 | sf->second->pts *= 2; |
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| 113 | extract_field(sf->second, sf->nb_planes, sf->second->top_field_first); |
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| 114 | ret = ff_filter_frame(outlink, sf->second); |
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| 115 | sf->second = 0; |
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| 116 | } |
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| 117 | |||
| 118 | return ret; |
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| 119 | } |
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| 120 | |||
| 121 | static const AVFilterPad separatefields_inputs[] = { |
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| 122 | { |
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| 123 | .name = "default", |
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| 124 | .type = AVMEDIA_TYPE_VIDEO, |
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| 125 | .filter_frame = filter_frame, |
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| 126 | }, |
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| 127 | { NULL } |
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| 128 | }; |
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| 129 | |||
| 130 | static const AVFilterPad separatefields_outputs[] = { |
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| 131 | { |
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| 132 | .name = "default", |
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| 133 | .type = AVMEDIA_TYPE_VIDEO, |
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| 134 | .config_props = config_props_output, |
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| 135 | .request_frame = request_frame, |
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| 136 | }, |
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| 137 | { NULL } |
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| 138 | }; |
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| 139 | |||
| 140 | AVFilter avfilter_vf_separatefields = { |
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| 141 | .name = "separatefields", |
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| 142 | .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."), |
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| 143 | .priv_size = sizeof(SeparateFieldsContext), |
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| 144 | .inputs = separatefields_inputs, |
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| 145 | .outputs = separatefields_outputs, |
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| 146 | }; |