1 files changed, 94 insertions, 0 deletions
diff --git a/libavfilter/vf_setfield.c b/libavfilter/vf_setfield.c
new file mode 100644
index 0000000000..eb4df74943
--- /dev/null
+++ b/libavfilter/vf_setfield.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2012 Stefano Sabatini
+ *
+ * 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
+ * set field order
+ */
+
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+enum SetFieldMode {
+    MODE_AUTO = -1,
+    MODE_BFF,
+    MODE_TFF,
+    MODE_PROG,
+};
+
+typedef struct {
+    const AVClass *class;
+    enum SetFieldMode mode;
+} SetFieldContext;
+
+#define OFFSET(x) offsetof(SetFieldContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption setfield_options[] = {
+    {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_AUTO}, -1, MODE_PROG, FLAGS, "mode"},
+    {"auto", "keep the same input field",  0, AV_OPT_TYPE_CONST, {.i64=MODE_AUTO}, INT_MIN, INT_MAX, FLAGS, "mode"},
+    {"bff",  "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
+    {"tff",  "mark as top-field-first",    0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF},  INT_MIN, INT_MAX, FLAGS, "mode"},
+    {"prog", "mark as progressive",        0, AV_OPT_TYPE_CONST, {.i64=MODE_PROG}, INT_MIN, INT_MAX, FLAGS, "mode"},
+    {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(setfield);
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
+{
+    SetFieldContext *setfield = inlink->dst->priv;
+
+    if (setfield->mode == MODE_PROG) {
+        picref->interlaced_frame = 0;
+    } else if (setfield->mode != MODE_AUTO) {
+        picref->interlaced_frame = 1;
+        picref->top_field_first = setfield->mode;
+    }
+    return ff_filter_frame(inlink->dst->outputs[0], picref);
+}
+
+static const AVFilterPad setfield_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad setfield_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_setfield = {
+    .name        = "setfield",
+    .description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
+    .priv_size   = sizeof(SetFieldContext),
+    .priv_class  = &setfield_class,
+    .inputs      = setfield_inputs,
+    .outputs     = setfield_outputs,
+};