For #1659, #307, add ffmpeg-4.2-fit for rtc

trunk/3rdparty/ffmpeg-4.2-fit/libavutil/stereo3d.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
+ *
+ * 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
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "common.h"
+#include "mem.h"
+#include "stereo3d.h"
+
+AVStereo3D *av_stereo3d_alloc(void)
+{
+    return av_mallocz(sizeof(AVStereo3D));
+}
+
+AVStereo3D *av_stereo3d_create_side_data(AVFrame *frame)
+{
+    AVFrameSideData *side_data = av_frame_new_side_data(frame,
+                                                        AV_FRAME_DATA_STEREO3D,
+                                                        sizeof(AVStereo3D));
+    if (!side_data)
+        return NULL;
+
+    memset(side_data->data, 0, sizeof(AVStereo3D));
+
+    return (AVStereo3D *)side_data->data;
+}
+
+static const char * const stereo3d_type_names[] = {
+    [AV_STEREO3D_2D]                  = "2D",
+    [AV_STEREO3D_SIDEBYSIDE]          = "side by side",
+    [AV_STEREO3D_TOPBOTTOM]           = "top and bottom",
+    [AV_STEREO3D_FRAMESEQUENCE]       = "frame alternate",
+    [AV_STEREO3D_CHECKERBOARD]        = "checkerboard",
+    [AV_STEREO3D_SIDEBYSIDE_QUINCUNX] = "side by side (quincunx subsampling)",
+    [AV_STEREO3D_LINES]               = "interleaved lines",
+    [AV_STEREO3D_COLUMNS]             = "interleaved columns",
+};
+
+const char *av_stereo3d_type_name(unsigned int type)
+{
+    if (type >= FF_ARRAY_ELEMS(stereo3d_type_names))
+        return "unknown";
+
+    return stereo3d_type_names[type];
+}
+
+int av_stereo3d_from_name(const char *name)
+{
+    int i;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(stereo3d_type_names); i++) {
+        size_t len = strlen(stereo3d_type_names[i]);
+        if (!strncmp(stereo3d_type_names[i], name, len))
+            return i;
+    }
+
+    return -1;
+}