mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-27 11:51:49 +02:00
209 lines
6.5 KiB
C
209 lines
6.5 KiB
C
/*
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* Copyright (c) 2012 Steven Robertson
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* copy an alpha component from another video's luma
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*/
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#include <string.h>
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#include "libavutil/pixfmt.h"
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#include "avfilter.h"
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#include "bufferqueue.h"
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#include "drawutils.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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enum { Y, U, V, A };
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typedef struct {
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int frame_requested;
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int is_packed_rgb;
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uint8_t rgba_map[4];
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struct FFBufQueue queue_main;
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struct FFBufQueue queue_alpha;
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} AlphaMergeContext;
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AlphaMergeContext *merge = ctx->priv;
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ff_bufqueue_discard_all(&merge->queue_main);
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ff_bufqueue_discard_all(&merge->queue_alpha);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat main_fmts[] = {
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
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AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
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AVFilterFormats *main_formats = ff_make_format_list(main_fmts);
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AVFilterFormats *alpha_formats = ff_make_format_list(alpha_fmts);
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ff_formats_ref(main_formats, &ctx->inputs[0]->out_formats);
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ff_formats_ref(alpha_formats, &ctx->inputs[1]->out_formats);
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ff_formats_ref(main_formats, &ctx->outputs[0]->in_formats);
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return 0;
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}
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static int config_input_main(AVFilterLink *inlink)
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{
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AlphaMergeContext *merge = inlink->dst->priv;
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merge->is_packed_rgb =
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ff_fill_rgba_map(merge->rgba_map, inlink->format) >= 0;
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *mainlink = ctx->inputs[0];
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AVFilterLink *alphalink = ctx->inputs[1];
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if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) {
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av_log(ctx, AV_LOG_ERROR,
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"Input frame sizes do not match (%dx%d vs %dx%d).\n",
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mainlink->w, mainlink->h,
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alphalink->w, alphalink->h);
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return AVERROR(EINVAL);
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}
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outlink->w = mainlink->w;
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outlink->h = mainlink->h;
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outlink->time_base = mainlink->time_base;
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outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
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outlink->frame_rate = mainlink->frame_rate;
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return 0;
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}
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static void draw_frame(AVFilterContext *ctx,
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AVFilterBufferRef *main_buf,
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AVFilterBufferRef *alpha_buf)
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{
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AlphaMergeContext *merge = ctx->priv;
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int h = main_buf->video->h;
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if (merge->is_packed_rgb) {
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int x, y;
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uint8_t *pin, *pout;
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for (y = 0; y < h; y++) {
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pin = alpha_buf->data[0] + y * alpha_buf->linesize[0];
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pout = main_buf->data[0] + y * main_buf->linesize[0] + merge->rgba_map[A];
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for (x = 0; x < main_buf->video->w; x++) {
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*pout = *pin;
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pin += 1;
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pout += 4;
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}
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}
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} else {
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int y;
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const int main_linesize = main_buf->linesize[A];
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const int alpha_linesize = alpha_buf->linesize[Y];
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for (y = 0; y < h && y < alpha_buf->video->h; y++) {
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memcpy(main_buf->data[A] + y * main_linesize,
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alpha_buf->data[Y] + y * alpha_linesize,
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FFMIN(main_linesize, alpha_linesize));
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}
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
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{
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AVFilterContext *ctx = inlink->dst;
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AlphaMergeContext *merge = ctx->priv;
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int is_alpha = (inlink == ctx->inputs[1]);
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struct FFBufQueue *queue =
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(is_alpha ? &merge->queue_alpha : &merge->queue_main);
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ff_bufqueue_add(ctx, queue, buf);
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while (1) {
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AVFilterBufferRef *main_buf, *alpha_buf;
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if (!ff_bufqueue_peek(&merge->queue_main, 0) ||
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!ff_bufqueue_peek(&merge->queue_alpha, 0)) break;
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main_buf = ff_bufqueue_get(&merge->queue_main);
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alpha_buf = ff_bufqueue_get(&merge->queue_alpha);
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merge->frame_requested = 0;
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draw_frame(ctx, main_buf, alpha_buf);
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ff_filter_frame(ctx->outputs[0], main_buf);
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avfilter_unref_buffer(alpha_buf);
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}
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AlphaMergeContext *merge = ctx->priv;
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int in, ret;
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merge->frame_requested = 1;
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while (merge->frame_requested) {
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in = ff_bufqueue_peek(&merge->queue_main, 0) ? 1 : 0;
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ret = ff_request_frame(ctx->inputs[in]);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static const AVFilterPad alphamerge_inputs[] = {
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{
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.name = "main",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input_main,
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.get_video_buffer = ff_null_get_video_buffer,
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.filter_frame = filter_frame,
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.min_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE,
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},{
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.name = "alpha",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
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},
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{ NULL }
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};
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static const AVFilterPad alphamerge_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_alphamerge = {
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.name = "alphamerge",
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.description = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
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"input into the alpha channel of the first input."),
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.uninit = uninit,
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.priv_size = sizeof(AlphaMergeContext),
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.query_formats = query_formats,
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.inputs = alphamerge_inputs,
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.outputs = alphamerge_outputs,
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};
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