[FFmpeg-devel] [PATCH] avformat/mpegtsenc: add descriptors to synchronous KLV in mpegts
Daniel Riehm
daniel.riehm at kitware.com
Mon Mar 14 18:32:22 EET 2022
The metadata_descriptor and metadata_std_descriptor structures are
defined by ISO/IEC 13818-1, Sections 2.6.61 and 2.6.62. Their inclusion
in the PMT is motivated and required by MISB ST1402.2: Section 9.4.1:
Requirements 15, 16, 17.
Signed-off-by: Daniel Riehm <daniel.riehm at kitware.com>
---
libavformat/mpegtsenc.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 20dce56122..0f11f0827d 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -797,6 +797,29 @@ static int mpegts_write_pmt(AVFormatContext *s,
MpegTSService *service)
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 == FF_PROFILE_KLVA_SYNC) {
+ const char *tag = "KLVA";
+ *q++ = METADATA_DESCRIPTOR;
+ *q++ = 9; /* descriptor_length */
+ put16(&q, 0x0100); /*
metadata_application_format */
+ *q++ = 0xff; /* metadata_format */
+ putbuf(&q, tag, strlen(tag)); /*
metadata_format_identifier */
+ *q++ = 0x00; /* metadata_service_id */
+ *q++ = 0x0f; /*
decoder_config_flags|DSM-CC_flag|reserved */
+
+ *q++ = METADATA_STD_DESCRIPTOR;
+ *q++ = 9; /* descriptor_length */
+ *q++ = 0xc0; /* reserved|metadata_input_leak_rate */
+ *q++ = 0x00;
+ *q++ = 0x00;
+ *q++ = 0xc0; /* reserved|metadata_buffer_size */
+ *q++ = 0x00;
+ *q++ = 0x00;
+ *q++ = 0xc0; /* reserved|metadata_output_leak_rate */
+ *q++ = 0x00;
+ *q++ = 0x00;
+ }
} else if (codec_id == AV_CODEC_ID_TIMED_ID3) {
const char *tag = "ID3 ";
*q++ = METADATA_DESCRIPTOR;
--
2.25.1
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