movenc: support cenc (common encryption)

support writing encrypted mp4 using aes-ctr, conforming to ISO/IEC
23001-7.

3 new parameters were added:
- encryption_scheme - allowed values are none (default) and cenc-aes-ctr
- encryption_key - 128 bit encryption key (hex)
- encryption_kid - 128 bit encryption key identifier (hex)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 16 insertions, 0 deletions

diff --git a/libavformat/movenc.h b/libavformat/movenc.h
index 06adf2b121..deb90fe2a7 100644
--- a/libavformat/movenc.h
+++ b/libavformat/movenc.h
@@ -25,6 +25,7 @@
 #define AVFORMAT_MOVENC_H
 
 #include "avformat.h"
+#include "movenccenc.h"
 
 #define MOV_FRAG_INFO_ALLOC_INCREMENT 64
 #define MOV_INDEX_CLUSTER_SIZE 1024
@@ -149,8 +150,15 @@ typedef struct MOVTrack {
     } vc1_info;
 
     void       *eac3_priv;
+
+    MOVMuxCencContext cenc;
 } MOVTrack;
 
+typedef enum {
+    MOV_ENC_NONE = 0,
+    MOV_ENC_CENC_AES_CTR,
+} MOVEncryptionScheme;
+
 typedef struct MOVMuxContext {
     const AVClass *av_class;
     int     mode;
@@ -193,6 +201,14 @@ typedef struct MOVMuxContext {
 
     int frag_interleave;
     int missing_duration_warned;
+
+    char *encryption_scheme_str;
+    MOVEncryptionScheme encryption_scheme;
+    uint8_t *encryption_key;
+    int encryption_key_len;
+    uint8_t *encryption_kid;
+    int encryption_kid_len;
+
 } MOVMuxContext;
 
 #define FF_MOV_FLAG_RTP_HINT              (1 <<  0)