[FFmpeg-devel] [PATCH] avformat/mpegtsenc: add descriptors to synchronous KLV in mpegts

[Daniel Riehm <daniel.riehm@kitware.com>]

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@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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