[FFmpeg-cvslog] avformat/dashdec: accept and relay CENC decryption key
Gyan Doshi
git at videolan.org
Sat May 14 13:58:45 EEST 2022
ffmpeg | branch: master | Gyan Doshi <ffmpeg at gyani.pro> | Sat May 14 14:56:56 2022 +0530| [8b64d8d9aa7fede94ab531b7be3f73cd2f3c448c] | committer: Gyan Doshi
avformat/dashdec: accept and relay CENC decryption key
Allows to process CENC-encrypted media segments.
Option arg syntax is same as that for option decryption_key in MOV demuxer
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8b64d8d9aa7fede94ab531b7be3f73cd2f3c448c
---
doc/demuxers.texi | 11 +++++++++++
libavformat/dashdec.c | 5 +++++
2 files changed, 16 insertions(+)
diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index 238b8e03a8..c95a9ae594 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -274,6 +274,17 @@ which streams to actually receive.
Each stream mirrors the @code{id} and @code{bandwidth} properties from the
@code{<Representation>} as metadata keys named "id" and "variant_bitrate" respectively.
+ at subsection Options
+
+This demuxer accepts the following option:
+
+ at table @option
+
+ at item cenc_decryption_key
+16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+ at end table
+
@section imf
Interoperable Master Format demuxer.
diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index 0b5ff5aeb9..0f66251354 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -150,6 +150,7 @@ typedef struct DASHContext {
char *allowed_extensions;
AVDictionary *avio_opts;
int max_url_size;
+ char *cenc_decryption_key;
/* Flags for init section*/
int is_init_section_common_video;
@@ -1893,6 +1894,9 @@ static int reopen_demux_for_component(AVFormatContext *s, struct representation
pls->ctx->pb = &pls->pb.pub;
pls->ctx->io_open = nested_io_open;
+ if (c->cenc_decryption_key)
+ av_dict_set(&in_fmt_opts, "decryption_key", c->cenc_decryption_key, AV_OPT_FLAG_DECODING_PARAM);
+
// provide additional information from mpd if available
ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
av_dict_free(&in_fmt_opts);
@@ -2344,6 +2348,7 @@ static const AVOption dash_options[] = {
OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
{.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
INT_MIN, INT_MAX, FLAGS},
+ { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
{NULL}
};
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