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|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2013 Paul B Mahol | ||
| 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 | #include "libavutil/pixdesc.h" | ||
| 22 | #include "avfilter.h" | ||
| 23 | #include "filters.h" | ||
| 24 | #include "internal.h" | ||
| 25 | #include "video.h" | ||
| 26 | |||
| 27 | typedef struct SeparateFieldsContext { | ||
| 28 | int nb_planes; | ||
| 29 | AVFrame *second; | ||
| 30 | } SeparateFieldsContext; | ||
| 31 | |||
| 32 | 1 | static int config_props_output(AVFilterLink *outlink) | |
| 33 | { | ||
| 34 | 1 | AVFilterContext *ctx = outlink->src; | |
| 35 | 1 | SeparateFieldsContext *s = ctx->priv; | |
| 36 | 1 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 37 | |||
| 38 | 1 | s->nb_planes = av_pix_fmt_count_planes(inlink->format); | |
| 39 | |||
| 40 |
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1 | if (inlink->h & 1) { |
| 41 | ✗ | av_log(ctx, AV_LOG_ERROR, "height must be even\n"); | |
| 42 | ✗ | return AVERROR_INVALIDDATA; | |
| 43 | } | ||
| 44 | |||
| 45 | 1 | outlink->time_base.num = inlink->time_base.num; | |
| 46 | 1 | outlink->time_base.den = inlink->time_base.den * 2; | |
| 47 | 1 | outlink->frame_rate.num = inlink->frame_rate.num * 2; | |
| 48 | 1 | outlink->frame_rate.den = inlink->frame_rate.den; | |
| 49 | 1 | outlink->w = inlink->w; | |
| 50 | 1 | outlink->h = inlink->h / 2; | |
| 51 | |||
| 52 | 1 | return 0; | |
| 53 | } | ||
| 54 | |||
| 55 | 100 | static void extract_field(AVFrame *frame, int nb_planes, int type) | |
| 56 | { | ||
| 57 | int i; | ||
| 58 | |||
| 59 |
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400 | for (i = 0; i < nb_planes; i++) { |
| 60 |
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300 | if (type) |
| 61 | 150 | frame->data[i] = frame->data[i] + frame->linesize[i]; | |
| 62 | 300 | frame->linesize[i] *= 2; | |
| 63 | } | ||
| 64 | 100 | } | |
| 65 | |||
| 66 | 50 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) | |
| 67 | { | ||
| 68 | 50 | AVFilterContext *ctx = inlink->dst; | |
| 69 | 50 | SeparateFieldsContext *s = ctx->priv; | |
| 70 | 50 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 71 | int ret; | ||
| 72 | |||
| 73 | 50 | inpicref->height = outlink->h; | |
| 74 | #if FF_API_INTERLACED_FRAME | ||
| 75 | FF_DISABLE_DEPRECATION_WARNINGS | ||
| 76 | 50 | inpicref->interlaced_frame = 0; | |
| 77 | FF_ENABLE_DEPRECATION_WARNINGS | ||
| 78 | #endif | ||
| 79 | 50 | inpicref->flags &= ~AV_FRAME_FLAG_INTERLACED; | |
| 80 | |||
| 81 |
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50 | if (!s->second) { |
| 82 | 1 | goto clone; | |
| 83 | } else { | ||
| 84 | 49 | AVFrame *second = s->second; | |
| 85 | |||
| 86 | 49 | extract_field(second, s->nb_planes, !!(second->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)); | |
| 87 | |||
| 88 |
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49 | if (second->pts != AV_NOPTS_VALUE && |
| 89 |
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49 | inpicref->pts != AV_NOPTS_VALUE) |
| 90 | 49 | second->pts += inpicref->pts; | |
| 91 | else | ||
| 92 | ✗ | second->pts = AV_NOPTS_VALUE; | |
| 93 | |||
| 94 | 49 | ret = ff_filter_frame(outlink, second); | |
| 95 |
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49 | if (ret < 0) |
| 96 | ✗ | return ret; | |
| 97 | 49 | clone: | |
| 98 | 50 | s->second = av_frame_clone(inpicref); | |
| 99 |
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50 | if (!s->second) |
| 100 | ✗ | return AVERROR(ENOMEM); | |
| 101 | } | ||
| 102 | |||
| 103 | 50 | extract_field(inpicref, s->nb_planes, !(inpicref->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)); | |
| 104 | |||
| 105 |
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50 | if (inpicref->pts != AV_NOPTS_VALUE) |
| 106 | 50 | inpicref->pts *= 2; | |
| 107 | |||
| 108 | 50 | return ff_filter_frame(outlink, inpicref); | |
| 109 | } | ||
| 110 | |||
| 111 | 1 | static int flush_frame(AVFilterLink *outlink, int64_t pts, int64_t *out_pts) | |
| 112 | { | ||
| 113 | 1 | AVFilterContext *ctx = outlink->src; | |
| 114 | 1 | SeparateFieldsContext *s = ctx->priv; | |
| 115 | 1 | int ret = 0; | |
| 116 | |||
| 117 |
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1 | if (s->second) { |
| 118 | 1 | *out_pts = s->second->pts += pts; | |
| 119 | 1 | extract_field(s->second, s->nb_planes, !!(s->second->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)); | |
| 120 | 1 | ret = ff_filter_frame(outlink, s->second); | |
| 121 | 1 | s->second = NULL; | |
| 122 | } | ||
| 123 | |||
| 124 | 1 | return ret; | |
| 125 | } | ||
| 126 | |||
| 127 | 101 | static int activate(AVFilterContext *ctx) | |
| 128 | { | ||
| 129 | 101 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 130 | 101 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 131 | AVFrame *in; | ||
| 132 | int64_t pts; | ||
| 133 | int ret, status; | ||
| 134 | |||
| 135 |
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101 | FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
| 136 | |||
| 137 | 101 | ret = ff_inlink_consume_frame(inlink, &in); | |
| 138 |
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101 | if (ret < 0) |
| 139 | ✗ | return ret; | |
| 140 |
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101 | if (ret > 0) |
| 141 | 50 | return filter_frame(inlink, in); | |
| 142 | |||
| 143 |
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51 | if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { |
| 144 |
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1 | if (status == AVERROR_EOF) { |
| 145 | 1 | int64_t out_pts = pts; | |
| 146 | |||
| 147 | 1 | ret = flush_frame(outlink, pts, &out_pts); | |
| 148 | 1 | ff_outlink_set_status(outlink, status, out_pts); | |
| 149 | 1 | return ret; | |
| 150 | } | ||
| 151 | } | ||
| 152 | |||
| 153 |
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50 | FF_FILTER_FORWARD_WANTED(outlink, inlink); |
| 154 | |||
| 155 | ✗ | return FFERROR_NOT_READY; | |
| 156 | } | ||
| 157 | |||
| 158 | 2 | static av_cold void uninit(AVFilterContext *ctx) | |
| 159 | { | ||
| 160 | 2 | SeparateFieldsContext *s = ctx->priv; | |
| 161 | |||
| 162 | 2 | av_frame_free(&s->second); | |
| 163 | 2 | } | |
| 164 | |||
| 165 | static const AVFilterPad separatefields_outputs[] = { | ||
| 166 | { | ||
| 167 | .name = "default", | ||
| 168 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 169 | .config_props = config_props_output, | ||
| 170 | }, | ||
| 171 | }; | ||
| 172 | |||
| 173 | const AVFilter ff_vf_separatefields = { | ||
| 174 | .name = "separatefields", | ||
| 175 | .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."), | ||
| 176 | .priv_size = sizeof(SeparateFieldsContext), | ||
| 177 | .activate = activate, | ||
| 178 | .uninit = uninit, | ||
| 179 | FILTER_INPUTS(ff_video_default_filterpad), | ||
| 180 | FILTER_OUTPUTS(separatefields_outputs), | ||
| 181 | }; | ||
| 182 |