This patch set updates movenc to write uncompressed ycbcr in mov following
requirements in Apple’s TN2162,
https://developer.apple.com/library/content/technotes/tn2162/_index.html.
Thanks to Carl and Michael for comments on an earlier version of this patchset.
From 26d9ca470f104d8448000b13c2cc97b8fc5c15ba Mon Sep 17 00:00:00 2001
From: Dave Rice
Date: Thu, 16 Nov 2017 11:53:32 -0500
Subject: [PATCH 1/4] avformat/movenc: correct ImageDescription for
uncompressed ycbcr
Per
https://developer.apple.com/library/content/technotes/tn2162/_index.html
.
---
libavformat/movenc.c | 20 +---
1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index cc3fc19d9b..ce51c4b3d2 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1832,6 +1832,13 @@ static int mov_write_video_tag(AVIOContext *pb,
MOVMuxContext *mov, MOVTrack *tr
char compressor_name[32] = { 0 };
int avid = 0;
+int uncompressed_ycbcr = ((track->par->codec_id == AV_CODEC_ID_RAWVIDEO &&
track->par->format == AV_PIX_FMT_UYVY422)
+ || (track->par->codec_id == AV_CODEC_ID_RAWVIDEO &&
track->par->format == AV_PIX_FMT_YUYV422)
+ || track->par->codec_id == AV_CODEC_ID_V308
+ || track->par->codec_id == AV_CODEC_ID_V408
+ || track->par->codec_id == AV_CODEC_ID_V410
+ || track->par->codec_id == AV_CODEC_ID_V210);
+
avio_wb32(pb, 0); /* size */
if (mov->encryption_scheme != MOV_ENC_NONE) {
ffio_wfourcc(pb, "encv");
@@ -1842,11 +1849,15 @@ static int mov_write_video_tag(AVIOContext *pb,
MOVMuxContext *mov, MOVTrack *tr
avio_wb16(pb, 0); /* Reserved */
avio_wb16(pb, 1); /* Data-reference index */
-avio_wb16(pb, 0); /* Codec stream version */
+if (uncompressed_ycbcr) {
+avio_wb16(pb, 2); /* Codec stream version */
+} else {
+avio_wb16(pb, 0); /* Codec stream version */
+}
avio_wb16(pb, 0); /* Codec stream revision (=0) */
if (track->mode == MODE_MOV) {
ffio_wfourcc(pb, "FFMP"); /* Vendor */
-if (track->par->codec_id == AV_CODEC_ID_RAWVIDEO) {
+if (track->par->codec_id == AV_CODEC_ID_RAWVIDEO ||
uncompressed_ycbcr) {
avio_wb32(pb, 0); /* Temporal Quality */
avio_wb32(pb, 0x400); /* Spatial Quality = lossless*/
} else {
@@ -1870,7 +1881,10 @@ static int mov_write_video_tag(AVIOContext *pb,
MOVMuxContext *mov, MOVTrack *tr
avio_w8(pb, strlen(compressor_name));
avio_write(pb, compressor_name, 31);
-if (track->mode == MODE_MOV && track->par->bits_per_coded_sample)
+if (track->mode == MODE_MOV &&
+ (track->par->codec_id == AV_CODEC_ID_V410 || track->par->codec_id ==
AV_CODEC_ID_V210))
+avio_wb16(pb, 0x18);
+else if (track->mode == MODE_MOV && track->par->bits_per_coded_sample)
avio_wb16(pb, track->par->bits_per_coded_sample |
(track->par->format == AV_PIX_FMT_GRAY8 ? 0x20 : 0));
else
--
2.15.0
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