lavfi: remove alphaextract special code

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/Makefile

@@ -101,7 +101,7 @@ OBJS-$(CONFIG_SINE_FILTER)                   += asrc_sine.o
 OBJS-$(CONFIG_ANULLSINK_FILTER)              += asink_anullsink.o
 
 OBJS-$(CONFIG_ASS_FILTER)                    += vf_subtitles.o
-OBJS-$(CONFIG_ALPHAEXTRACT_FILTER)           += vf_alphaextract.o
+OBJS-$(CONFIG_ALPHAEXTRACT_FILTER)           += vf_extractplanes.o
 OBJS-$(CONFIG_ALPHAMERGE_FILTER)             += vf_alphamerge.o
 OBJS-$(CONFIG_BBOX_FILTER)                   += bbox.o vf_bbox.o
 OBJS-$(CONFIG_BLACKDETECT_FILTER)            += vf_blackdetect.o

libavfilter/vf_alphaextract.c

-/*
- * Copyright (c) 2012 Steven Robertson
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * simple channel-swapping filter to get at the alpha component
- */
-
-#include <string.h>
-
-#include "libavutil/pixfmt.h"
-#include "avfilter.h"
-#include "drawutils.h"
-#include "internal.h"
-#include "formats.h"
-#include "video.h"
-
-enum { Y, U, V, A };
-
-typedef struct {
-    int is_packed_rgb;
-    uint8_t rgba_map[4];
-} AlphaExtractContext;
-
-static int query_formats(AVFilterContext *ctx)
-{
-    static const enum AVPixelFormat in_fmts[] = {
-        AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
-        AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
-        AV_PIX_FMT_NONE
-    };
-    static const enum AVPixelFormat out_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
-    ff_formats_ref(ff_make_format_list(in_fmts), &ctx->inputs[0]->out_formats);
-    ff_formats_ref(ff_make_format_list(out_fmts), &ctx->outputs[0]->in_formats);
-    return 0;
-}
-
-static int config_input(AVFilterLink *inlink)
-{
-    AlphaExtractContext *extract = inlink->dst->priv;
-    extract->is_packed_rgb =
-        ff_fill_rgba_map(extract->rgba_map, inlink->format) >= 0;
-    return 0;
-}
-
-static int filter_frame(AVFilterLink *inlink, AVFrame *cur_buf)
-{
-    AlphaExtractContext *extract = inlink->dst->priv;
-    AVFilterLink *outlink = inlink->dst->outputs[0];
-    AVFrame *out_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h);
-    int ret;
-
-    if (!out_buf) {
-        ret = AVERROR(ENOMEM);
-        goto end;
-    }
-    av_frame_copy_props(out_buf, cur_buf);
-
-    if (extract->is_packed_rgb) {
-        int x, y;
-        uint8_t *pcur, *pout;
-        for (y = 0; y < outlink->h; y++) {
-            pcur = cur_buf->data[0] + y * cur_buf->linesize[0] + extract->rgba_map[A];
-            pout = out_buf->data[0] + y * out_buf->linesize[0];
-            for (x = 0; x < outlink->w; x++) {
-                *pout = *pcur;
-                pout += 1;
-                pcur += 4;
-            }
-        }
-    } else {
-        int y;
-        for (y = 0; y < outlink->h; y++) {
-            memcpy(out_buf->data[Y] + y * out_buf->linesize[Y],
-                   cur_buf->data[A] + y * cur_buf->linesize[A],
-                   outlink->w);
-        }
-    }
-
-    ret = ff_filter_frame(outlink, out_buf);
-
-end:
-    av_frame_free(&cur_buf);
-    return ret;
-}
-
-static const AVFilterPad alphaextract_inputs[] = {
-    {
-        .name         = "default",
-        .type         = AVMEDIA_TYPE_VIDEO,
-        .config_props = config_input,
-        .filter_frame = filter_frame,
-    },
-    { NULL }
-};
-
-static const AVFilterPad alphaextract_outputs[] = {
-    {
-        .name = "default",
-        .type = AVMEDIA_TYPE_VIDEO,
-    },
-    { NULL }
-};
-
-AVFilter avfilter_vf_alphaextract = {
-    .name           = "alphaextract",
-    .description    = NULL_IF_CONFIG_SMALL("Extract an alpha channel as a "
-                      "grayscale image component."),
-    .priv_size      = sizeof(AlphaExtractContext),
-    .query_formats  = query_formats,
-    .inputs         = alphaextract_inputs,
-    .outputs        = alphaextract_outputs,
-};

libavfilter/vf_extractplanes.c

@@ -308,3 +308,28 @@ AVFilter avfilter_vf_extractplanes = {
     .outputs       = NULL,
     .flags         = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 };
+
+#if CONFIG_ALPHAEXTRACT_FILTER
+
+static int init_alphaextract(AVFilterContext *ctx)
+{
+    ExtractPlanesContext *e = ctx->priv;
+
+    e->requested_planes = PLANE_A;
+
+    return init(ctx);
+}
+
+AVFilter avfilter_vf_alphaextract = {
+    .name           = "alphaextract",
+    .description    = NULL_IF_CONFIG_SMALL("Extract an alpha channel as a "
+                      "grayscale image component."),
+    .priv_size      = sizeof(ExtractPlanesContext),
+    .init           = init_alphaextract,
+    .uninit         = uninit,
+    .query_formats  = query_formats,
+    .inputs         = extractplanes_inputs,
+    .outputs        = NULL,
+    .flags          = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
+};
+#endif  /* CONFIG_ALPHAEXTRACT_FILTER */