From: Caleb Sawyer <Caleb.Sawyer@GSDeng.com>
To: "ffmpeg-devel@ffmpeg.org" <ffmpeg-devel@ffmpeg.org>
Cc: Caleb Sawyer <Caleb.Sawyer@GSDeng.com>
Subject: [FFmpeg-devel] [PATCH v3] mpegtsenc: Add SYNC KLV metadata descriptors (MISB ST1402)
Date: Thu, 3 Jul 2025 15:36:00 +0000
Message-ID: <20250703153557.1210-1-caleb.sawyer@gsdeng.com> (raw)
From: Caleb Sawyer <caleb.sawyer@gsdeng.com>
Added metadata_descriptor and metadata_std_descriptor to the PMT for synchronous KLV streams. Asynchronous KLV streams remain as they were. The descriptors are required by MISB ST-1402.2 and are in accordance with ISO/IEC 13818-1.
Signed-off-by: Caleb Sawyer <caleb.sawyer@gsdeng.com>
---
libavformat/mpegtsenc.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 6935b71cfe..e99e189299 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -814,7 +814,28 @@ static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
break;
case AVMEDIA_TYPE_DATA:
if (codec_id == AV_CODEC_ID_SMPTE_KLV) {
- put_registration_descriptor(&q, MKTAG('K', 'L', 'V', 'A'));
+ if (st->codecpar->profile == AV_PROFILE_KLVA_SYNC) {
+ const char *fmtIdent = "KLVA";
+ *q++ = METADATA_DESCRIPTOR;
+ *q++ = 9; /* descriptor length */
+ put16(&q, 0x0100); /* metadata_application_format */
+ *q++ = 0xff; /* metadata_format */
+ putbuf(&q, fmtIdent, 4); /* KLVA */
+ *q++ = 0x00; /* metadata_service_id */
+ *q++ = 0x0f; /* decoder_config_flags, DSM-CC_flat, reserved */
+ *q++ = METADATA_STD_DESCRIPTOR;
+ *q++ = 9; /* descriptor length */
+ *q++ = 0xc0;
+ put16(&q, 0x0000); /* reserved, metadata_input_leak_rate 0x01c4 */
+ *q++ = 0xc0;
+ put16(&q, 0x0000); /* reserved, metadata_buffer_size 0x0400 */
+ *q++ = 0xc0;
+ put16(&q, 0x0000); /* reserved, metadata_output_leak_rate */
+ } else {
+ put_registration_descriptor(&q, MKTAG('K', 'L', 'V', 'A'));
+ }
+ } else if (codec_id == AV_CODEC_ID_SMPTE_2038) {
+ put_registration_descriptor(&q, MKTAG('V', 'A', 'N', 'C'));
} else if (codec_id == AV_CODEC_ID_SMPTE_2038) {
put_registration_descriptor(&q, MKTAG('V', 'A', 'N', 'C'));
} else if (codec_id == AV_CODEC_ID_TIMED_ID3) {
--
2.47.1.windows.1
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