[FFmpeg-devel] [PATCH v3 5/5] avformat/mov: Add support for reading and exporting horizontal field of view

[Derek Buitenhuis <derek.buitenhuis@gmail.com>]

These boxes are created by the Apple Vision Pro and the iPhone 15+ when
capture for the Vision Pro is enabled.

Based off of the swift API:
  * https://developer.apple.com/documentation/coremedia/kcmformatdescriptionextension_horizontalfieldofview

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
---
 libavformat/mov.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 5724b4ef93..367af8478b 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -6759,6 +6759,34 @@ static int mov_read_vexu(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     return 0;
 }
 
+static int mov_read_hfov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+    AVStream *st;
+    MOVStreamContext *sc;
+
+    if (c->fc->nb_streams < 1)
+        return 0;
+
+    st = c->fc->streams[c->fc->nb_streams - 1];
+    sc = st->priv_data;
+
+    if (atom.size != 4) {
+         av_log(c->fc, AV_LOG_ERROR, "Invalid size of hfov box: %"PRIu64"\n", atom.size);
+         return AVERROR_INVALIDDATA;
+    }
+
+
+    if (!sc->stereo3d) {
+        sc->stereo3d = av_stereo3d_alloc();
+        if (!sc->stereo3d)
+            return AVERROR(ENOMEM);
+    }
+
+    sc->stereo3d->horizontal_field_of_view = avio_rb32(pb);
+
+    return 0;
+}
+
 static int mov_parse_uuid_spherical(MOVStreamContext *sc, AVIOContext *pb, size_t len)
 {
     int ret = 0;
@@ -8878,6 +8906,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
 { MKTAG('s','t','3','d'), mov_read_st3d }, /* stereoscopic 3D video box */
 { MKTAG('s','v','3','d'), mov_read_sv3d }, /* spherical video box */
 { MKTAG('v','e','x','u'), mov_read_vexu }, /* video extension usage */
+{ MKTAG('h','f','o','v'), mov_read_hfov },
 { MKTAG('d','O','p','s'), mov_read_dops },
 { MKTAG('d','m','l','p'), mov_read_dmlp },
 { MKTAG('S','m','D','m'), mov_read_smdm },
-- 
2.43.0

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