Adding support for writing spherical metadata in Matroska.
From 5a9cf56bf3114186412bb5572b153f886edb6ddb Mon Sep 17 00:00:00 2001
From: Aaron Colwell <acolw...@google.com>
Date: Fri, 27 Jan 2017 12:07:25 -0800
Subject: [PATCH] matroskaenc: Add support for writing video projection
element.
Adding support for writing spherical metadata in Matroska.
---
libavformat/matroskaenc.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index f731b678b9..1b186db223 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1038,6 +1038,67 @@ static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
return ret;
}
+static int mkv_write_video_projection(AVIOContext *pb, AVStream *st)
+{
+ AVSphericalMapping *spherical_mapping = (AVSphericalMapping*)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL, NULL);
+ ebml_master projection;
+ int projection_type = 0;
+
+ AVIOContext *dyn_cp;
+ uint8_t *projection_private_ptr = NULL;
+ int ret, projection_private_size;
+
+ if (!spherical_mapping)
+ return 0;
+
+ if (spherical_mapping->projection != AV_SPHERICAL_EQUIRECTANGULAR &&
+ spherical_mapping->projection != AV_SPHERICAL_CUBEMAP) {
+ av_log(pb, AV_LOG_WARNING, "Unsupported projection %d. projection not written.\n", spherical_mapping->projection);
+ return 0;
+ }
+
+ ret = avio_open_dyn_buf(&dyn_cp);
+ if (ret < 0)
+ return ret;
+
+ switch (spherical_mapping->projection) {
+ case AV_SPHERICAL_EQUIRECTANGULAR:
+ projection_type = 1;
+
+ /* Create ProjectionPrivate contents */
+ avio_wb32(dyn_cp, 0); /* version = 0 & flags = 0 */
+ avio_wb32(dyn_cp, 0); /* projection_bounds_top */
+ avio_wb32(dyn_cp, 0); /* projection_bounds_bottom */
+ avio_wb32(dyn_cp, 0); /* projection_bounds_left */
+ avio_wb32(dyn_cp, 0); /* projection_bounds_right */
+ break;
+ case AV_SPHERICAL_CUBEMAP:
+ projection_type = 2;
+
+ /* Create ProjectionPrivate contents */
+ avio_wb32(dyn_cp, 0); /* version = 0 & flags = 0 */
+ avio_wb32(dyn_cp, 0); /* layout */
+ avio_wb32(dyn_cp, 0); /* padding */
+ break;
+ }
+
+ projection_private_size = avio_close_dyn_buf(dyn_cp, &projection_private_ptr);
+
+ projection = start_ebml_master(pb, MATROSKA_ID_VIDEOPROJECTION, 0);
+ put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE, projection_type);
+ if (projection_private_size)
+ put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE, projection_private_ptr, projection_private_size);
+
+ put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, (float)(spherical_mapping->yaw) / (1 << 16));
+ put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, (float)(spherical_mapping->pitch) / (1 << 16));
+ put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, (float)(spherical_mapping->roll) / (1 << 16));
+ end_ebml_master(pb, projection);
+
+ av_free(projection_private_ptr);
+
+ return 0;
+}
+
static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
int i, AVIOContext *pb, int default_stream_exists)
{
@@ -1251,6 +1312,9 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
ret = mkv_write_video_color(pb, par, st);
if (ret < 0)
return ret;
+ ret = mkv_write_video_projection(pb, st);
+ if (ret < 0)
+ return ret;
end_ebml_master(pb, subinfo);
break;
--
2.11.0.483.g087da7b7c-goog
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