[FFmpeg-devel] [PATCH] Encrypted SMPTE DC MXF - additional UL needed to unpack EKLV packet

* [FFmpeg-devel] [PATCH] Encrypted SMPTE DC MXF - additional UL needed to unpack EKLV packet
@ 2022-09-30 14:08 Richard Ayres
  2022-09-30 14:31 ` Pierre-Anthony Lemieux
  0 siblings, 1 reply; 10+ messages in thread
From: Richard Ayres @ 2022-09-30 14:08 UTC (permalink / raw)
  To: ffmpeg-devel

We had an issue where ffmpeg was unable to unpack the EKLV of an encrypted 3D SMPTE DC MXF.

The patch adds the SMPTE UL for EKLV packets (060e2b34.02040101.0d010301.027e0100), to mxfdec.c in order to unpack an EKLV packet found within an Encrypted SMPTE Digital Cinema MXF.

Signed-off-by: Richard Ayres <richard.ayres@bydeluxe.com>
---
 libavformat/mxfdec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index badd2be224..ebd64b1c68 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -343,6 +343,7 @@ static const uint8_t mxf_apple_coll_prefix[]               = { 0x06,0x0e,0x2b,0x
 /* complete keys to match */
 static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
+static const uint8_t mxf_encrypted_triplet_smpte_key[]     = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
 static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
 static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
 static const uint8_t mxf_ffv1_extradata[]                  = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x0e,0x04,0x01,0x06,0x0c,0x01,0x00,0x00,0x00 }; // FFV1InitializationMetadata
@@ -3738,6 +3739,7 @@ static int mxf_read_header(AVFormatContext *s)
         PRINT_KEY(s, "read header", klv.key);
         av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
+            IS_KLV_KEY(klv.key, mxf_encrypted_triplet_smpte_key) ||
             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
             IS_KLV_KEY(klv.key, mxf_canopus_essence_element_key) ||
             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||
@@ -3983,7 +3985,8 @@ static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
             pos = klv.next_klv - klv.length;
             PRINT_KEY(s, "read packet", klv.key);
             av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
-            if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
+            if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
+                IS_KLV_KEY(klv.key, mxf_encrypted_triplet_smpte_key)) {
                 ret = mxf_decrypt_triplet(s, pkt, &klv);
                 if (ret < 0) {
                     av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
--
2.25.1

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