yading@10: /*
yading@10:  * Copyright (c) 2012 Steven Robertson
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * copy an alpha component from another video's luma
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: 
yading@10: #include "libavutil/pixfmt.h"
yading@10: #include "avfilter.h"
yading@10: #include "bufferqueue.h"
yading@10: #include "drawutils.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: 
yading@10: enum { Y, U, V, A };
yading@10: 
yading@10: typedef struct {
yading@10:     int frame_requested;
yading@10:     int is_packed_rgb;
yading@10:     uint8_t rgba_map[4];
yading@10:     struct FFBufQueue queue_main;
yading@10:     struct FFBufQueue queue_alpha;
yading@10: } AlphaMergeContext;
yading@10: 
yading@10: static av_cold void uninit(AVFilterContext *ctx)
yading@10: {
yading@10:     AlphaMergeContext *merge = ctx->priv;
yading@10:     ff_bufqueue_discard_all(&merge->queue_main);
yading@10:     ff_bufqueue_discard_all(&merge->queue_alpha);
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     static const enum AVPixelFormat main_fmts[] = {
yading@10:         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
yading@10:         AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
yading@10:         AV_PIX_FMT_NONE
yading@10:     };
yading@10:     static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
yading@10:     AVFilterFormats *main_formats = ff_make_format_list(main_fmts);
yading@10:     AVFilterFormats *alpha_formats = ff_make_format_list(alpha_fmts);
yading@10:     ff_formats_ref(main_formats, &ctx->inputs[0]->out_formats);
yading@10:     ff_formats_ref(alpha_formats, &ctx->inputs[1]->out_formats);
yading@10:     ff_formats_ref(main_formats, &ctx->outputs[0]->in_formats);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_input_main(AVFilterLink *inlink)
yading@10: {
yading@10:     AlphaMergeContext *merge = inlink->dst->priv;
yading@10:     merge->is_packed_rgb =
yading@10:         ff_fill_rgba_map(merge->rgba_map, inlink->format) >= 0;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_output(AVFilterLink *outlink)
yading@10: {
yading@10:     AVFilterContext *ctx = outlink->src;
yading@10:     AVFilterLink *mainlink = ctx->inputs[0];
yading@10:     AVFilterLink *alphalink = ctx->inputs[1];
yading@10:     if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Input frame sizes do not match (%dx%d vs %dx%d).\n",
yading@10:                mainlink->w, mainlink->h,
yading@10:                alphalink->w, alphalink->h);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     outlink->w = mainlink->w;
yading@10:     outlink->h = mainlink->h;
yading@10:     outlink->time_base = mainlink->time_base;
yading@10:     outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
yading@10:     outlink->frame_rate = mainlink->frame_rate;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void draw_frame(AVFilterContext *ctx,
yading@10:                        AVFrame *main_buf,
yading@10:                        AVFrame *alpha_buf)
yading@10: {
yading@10:     AlphaMergeContext *merge = ctx->priv;
yading@10:     int h = main_buf->height;
yading@10: 
yading@10:     if (merge->is_packed_rgb) {
yading@10:         int x, y;
yading@10:         uint8_t *pin, *pout;
yading@10:         for (y = 0; y < h; y++) {
yading@10:             pin = alpha_buf->data[0] + y * alpha_buf->linesize[0];
yading@10:             pout = main_buf->data[0] + y * main_buf->linesize[0] + merge->rgba_map[A];
yading@10:             for (x = 0; x < main_buf->width; x++) {
yading@10:                 *pout = *pin;
yading@10:                 pin += 1;
yading@10:                 pout += 4;
yading@10:             }
yading@10:         }
yading@10:     } else {
yading@10:         int y;
yading@10:         const int main_linesize = main_buf->linesize[A];
yading@10:         const int alpha_linesize = alpha_buf->linesize[Y];
yading@10:         for (y = 0; y < h && y < alpha_buf->height; y++) {
yading@10:             memcpy(main_buf->data[A] + y * main_linesize,
yading@10:                    alpha_buf->data[Y] + y * alpha_linesize,
yading@10:                    FFMIN(main_linesize, alpha_linesize));
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     AlphaMergeContext *merge = ctx->priv;
yading@10: 
yading@10:     int ret = 0;
yading@10:     int is_alpha = (inlink == ctx->inputs[1]);
yading@10:     struct FFBufQueue *queue =
yading@10:         (is_alpha ? &merge->queue_alpha : &merge->queue_main);
yading@10:     ff_bufqueue_add(ctx, queue, buf);
yading@10: 
yading@10:     do {
yading@10:         AVFrame *main_buf, *alpha_buf;
yading@10: 
yading@10:         if (!ff_bufqueue_peek(&merge->queue_main, 0) ||
yading@10:             !ff_bufqueue_peek(&merge->queue_alpha, 0)) break;
yading@10: 
yading@10:         main_buf = ff_bufqueue_get(&merge->queue_main);
yading@10:         alpha_buf = ff_bufqueue_get(&merge->queue_alpha);
yading@10: 
yading@10:         merge->frame_requested = 0;
yading@10:         draw_frame(ctx, main_buf, alpha_buf);
yading@10:         ret = ff_filter_frame(ctx->outputs[0], main_buf);
yading@10:         av_frame_free(&alpha_buf);
yading@10:     } while (ret >= 0);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int request_frame(AVFilterLink *outlink)
yading@10: {
yading@10:     AVFilterContext *ctx = outlink->src;
yading@10:     AlphaMergeContext *merge = ctx->priv;
yading@10:     int in, ret;
yading@10: 
yading@10:     merge->frame_requested = 1;
yading@10:     while (merge->frame_requested) {
yading@10:         in = ff_bufqueue_peek(&merge->queue_main, 0) ? 1 : 0;
yading@10:         ret = ff_request_frame(ctx->inputs[in]);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVFilterPad alphamerge_inputs[] = {
yading@10:     {
yading@10:         .name             = "main",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .config_props     = config_input_main,
yading@10:         .get_video_buffer = ff_null_get_video_buffer,
yading@10:         .filter_frame     = filter_frame,
yading@10:         .needs_writable   = 1,
yading@10:     },{
yading@10:         .name             = "alpha",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .filter_frame     = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad alphamerge_outputs[] = {
yading@10:     {
yading@10:         .name          = "default",
yading@10:         .type          = AVMEDIA_TYPE_VIDEO,
yading@10:         .config_props  = config_output,
yading@10:         .request_frame = request_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_alphamerge = {
yading@10:     .name           = "alphamerge",
yading@10:     .description    = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
yading@10:                       "input into the alpha channel of the first input."),
yading@10:     .uninit         = uninit,
yading@10:     .priv_size      = sizeof(AlphaMergeContext),
yading@10:     .query_formats  = query_formats,
yading@10:     .inputs         = alphamerge_inputs,
yading@10:     .outputs        = alphamerge_outputs,
yading@10: };