| 1 | /* |
| 2 | * Copyright (c) 2012 Steven Robertson |
| 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 | * copy an alpha component from another video's luma |
| 24 | */ |
| 25 | |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include "libavutil/pixfmt.h" |
| 29 | #include "avfilter.h" |
| 30 | #include "bufferqueue.h" |
| 31 | #include "drawutils.h" |
| 32 | #include "formats.h" |
| 33 | #include "internal.h" |
| 34 | #include "video.h" |
| 35 | |
| 36 | enum { Y, U, V, A }; |
| 37 | |
| 38 | typedef struct { |
| 39 | int frame_requested; |
| 40 | int is_packed_rgb; |
| 41 | uint8_t rgba_map[4]; |
| 42 | struct FFBufQueue queue_main; |
| 43 | struct FFBufQueue queue_alpha; |
| 44 | } AlphaMergeContext; |
| 45 | |
| 46 | static av_cold void uninit(AVFilterContext *ctx) |
| 47 | { |
| 48 | AlphaMergeContext *merge = ctx->priv; |
| 49 | ff_bufqueue_discard_all(&merge->queue_main); |
| 50 | ff_bufqueue_discard_all(&merge->queue_alpha); |
| 51 | } |
| 52 | |
| 53 | static int query_formats(AVFilterContext *ctx) |
| 54 | { |
| 55 | static const enum AVPixelFormat main_fmts[] = { |
| 56 | AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, |
| 57 | AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, |
| 58 | AV_PIX_FMT_NONE |
| 59 | }; |
| 60 | static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; |
| 61 | AVFilterFormats *main_formats = ff_make_format_list(main_fmts); |
| 62 | AVFilterFormats *alpha_formats = ff_make_format_list(alpha_fmts); |
| 63 | ff_formats_ref(main_formats, &ctx->inputs[0]->out_formats); |
| 64 | ff_formats_ref(alpha_formats, &ctx->inputs[1]->out_formats); |
| 65 | ff_formats_ref(main_formats, &ctx->outputs[0]->in_formats); |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static int config_input_main(AVFilterLink *inlink) |
| 70 | { |
| 71 | AlphaMergeContext *merge = inlink->dst->priv; |
| 72 | merge->is_packed_rgb = |
| 73 | ff_fill_rgba_map(merge->rgba_map, inlink->format) >= 0; |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static int config_output(AVFilterLink *outlink) |
| 78 | { |
| 79 | AVFilterContext *ctx = outlink->src; |
| 80 | AVFilterLink *mainlink = ctx->inputs[0]; |
| 81 | AVFilterLink *alphalink = ctx->inputs[1]; |
| 82 | if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) { |
| 83 | av_log(ctx, AV_LOG_ERROR, |
| 84 | "Input frame sizes do not match (%dx%d vs %dx%d).\n", |
| 85 | mainlink->w, mainlink->h, |
| 86 | alphalink->w, alphalink->h); |
| 87 | return AVERROR(EINVAL); |
| 88 | } |
| 89 | |
| 90 | outlink->w = mainlink->w; |
| 91 | outlink->h = mainlink->h; |
| 92 | outlink->time_base = mainlink->time_base; |
| 93 | outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio; |
| 94 | outlink->frame_rate = mainlink->frame_rate; |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static void draw_frame(AVFilterContext *ctx, |
| 99 | AVFrame *main_buf, |
| 100 | AVFrame *alpha_buf) |
| 101 | { |
| 102 | AlphaMergeContext *merge = ctx->priv; |
| 103 | int h = main_buf->height; |
| 104 | |
| 105 | if (merge->is_packed_rgb) { |
| 106 | int x, y; |
| 107 | uint8_t *pin, *pout; |
| 108 | for (y = 0; y < h; y++) { |
| 109 | pin = alpha_buf->data[0] + y * alpha_buf->linesize[0]; |
| 110 | pout = main_buf->data[0] + y * main_buf->linesize[0] + merge->rgba_map[A]; |
| 111 | for (x = 0; x < main_buf->width; x++) { |
| 112 | *pout = *pin; |
| 113 | pin += 1; |
| 114 | pout += 4; |
| 115 | } |
| 116 | } |
| 117 | } else { |
| 118 | int y; |
| 119 | const int main_linesize = main_buf->linesize[A]; |
| 120 | const int alpha_linesize = alpha_buf->linesize[Y]; |
| 121 | for (y = 0; y < h && y < alpha_buf->height; y++) { |
| 122 | memcpy(main_buf->data[A] + y * main_linesize, |
| 123 | alpha_buf->data[Y] + y * alpha_linesize, |
| 124 | FFMIN(main_linesize, alpha_linesize)); |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
| 130 | { |
| 131 | AVFilterContext *ctx = inlink->dst; |
| 132 | AlphaMergeContext *merge = ctx->priv; |
| 133 | |
| 134 | int ret = 0; |
| 135 | int is_alpha = (inlink == ctx->inputs[1]); |
| 136 | struct FFBufQueue *queue = |
| 137 | (is_alpha ? &merge->queue_alpha : &merge->queue_main); |
| 138 | ff_bufqueue_add(ctx, queue, buf); |
| 139 | |
| 140 | do { |
| 141 | AVFrame *main_buf, *alpha_buf; |
| 142 | |
| 143 | if (!ff_bufqueue_peek(&merge->queue_main, 0) || |
| 144 | !ff_bufqueue_peek(&merge->queue_alpha, 0)) break; |
| 145 | |
| 146 | main_buf = ff_bufqueue_get(&merge->queue_main); |
| 147 | alpha_buf = ff_bufqueue_get(&merge->queue_alpha); |
| 148 | |
| 149 | merge->frame_requested = 0; |
| 150 | draw_frame(ctx, main_buf, alpha_buf); |
| 151 | ret = ff_filter_frame(ctx->outputs[0], main_buf); |
| 152 | av_frame_free(&alpha_buf); |
| 153 | } while (ret >= 0); |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | static int request_frame(AVFilterLink *outlink) |
| 158 | { |
| 159 | AVFilterContext *ctx = outlink->src; |
| 160 | AlphaMergeContext *merge = ctx->priv; |
| 161 | int in, ret; |
| 162 | |
| 163 | merge->frame_requested = 1; |
| 164 | while (merge->frame_requested) { |
| 165 | in = ff_bufqueue_peek(&merge->queue_main, 0) ? 1 : 0; |
| 166 | ret = ff_request_frame(ctx->inputs[in]); |
| 167 | if (ret < 0) |
| 168 | return ret; |
| 169 | } |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static const AVFilterPad alphamerge_inputs[] = { |
| 174 | { |
| 175 | .name = "main", |
| 176 | .type = AVMEDIA_TYPE_VIDEO, |
| 177 | .config_props = config_input_main, |
| 178 | .filter_frame = filter_frame, |
| 179 | .needs_writable = 1, |
| 180 | },{ |
| 181 | .name = "alpha", |
| 182 | .type = AVMEDIA_TYPE_VIDEO, |
| 183 | .filter_frame = filter_frame, |
| 184 | }, |
| 185 | { NULL } |
| 186 | }; |
| 187 | |
| 188 | static const AVFilterPad alphamerge_outputs[] = { |
| 189 | { |
| 190 | .name = "default", |
| 191 | .type = AVMEDIA_TYPE_VIDEO, |
| 192 | .config_props = config_output, |
| 193 | .request_frame = request_frame, |
| 194 | }, |
| 195 | { NULL } |
| 196 | }; |
| 197 | |
| 198 | AVFilter ff_vf_alphamerge = { |
| 199 | .name = "alphamerge", |
| 200 | .description = NULL_IF_CONFIG_SMALL("Copy the luma value of the second " |
| 201 | "input into the alpha channel of the first input."), |
| 202 | .uninit = uninit, |
| 203 | .priv_size = sizeof(AlphaMergeContext), |
| 204 | .query_formats = query_formats, |
| 205 | .inputs = alphamerge_inputs, |
| 206 | .outputs = alphamerge_outputs, |
| 207 | }; |