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  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 avfilter_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. };
  208.