From febd1c90a64c1df2d72600d0fe1f020e88d10953 Mon Sep 17 00:00:00 2001
From: "Daniel G. Taylor" <dan@programmer-art.org>
Date: Sun, 11 Oct 2009 23:09:33 +0000
Subject: [PATCH] Detect Windows Media DRM protected files and display warning
if no key was provided.
Patch by Daniel G. Taylor, dan programmer-art org
Originally committed as revision 20209 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavformat/asf.c | 12 ++++++++++++
libavformat/asf.h | 3 +++
libavformat/asfdec.c | 9 +++++++++
3 files changed, 24 insertions(+)
diff --git a/libavformat/asf.c b/libavformat/asf.c
index 79ef61444bb..cf01e073268 100644
--- a/libavformat/asf.c
+++ b/libavformat/asf.c
@@ -116,6 +116,18 @@ const ff_asf_guid ff_asf_language_guid = {
0xa9, 0x46, 0x43, 0x7c, 0xe0, 0xef, 0xfc, 0x4b, 0xb2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85
};
+const ff_asf_guid ff_asf_content_encryption = {
+ 0xfb, 0xb3, 0x11, 0x22, 0x23, 0xbd, 0xd2, 0x11, 0xb4, 0xb7, 0x00, 0xa0, 0xc9, 0x55, 0xfc, 0x6e
+};
+
+const ff_asf_guid ff_asf_ext_content_encryption = {
+ 0x14, 0xe6, 0x8a, 0x29, 0x22, 0x26, 0x17, 0x4c, 0xb9, 0x35, 0xda, 0xe0, 0x7e, 0xe9, 0x28, 0x9c
+};
+
+const ff_asf_guid ff_asf_digital_signature = {
+ 0xfc, 0xb3, 0x11, 0x22, 0x23, 0xbd, 0xd2, 0x11, 0xb4, 0xb7, 0x00, 0xa0, 0xc9, 0x55, 0xfc, 0x6e
+};
+
const AVMetadataConv ff_asf_metadata_conv[] = {
{ "AlbumArtist", "artist" },
{ "AlbumTitle" , "album" },
diff --git a/libavformat/asf.h b/libavformat/asf.h
index 314c0f88825..dd623e8f345 100644
--- a/libavformat/asf.h
+++ b/libavformat/asf.h
@@ -160,6 +160,9 @@ extern const ff_asf_guid ff_asf_ext_stream_audio_stream;
extern const ff_asf_guid ff_asf_metadata_header;
extern const ff_asf_guid ff_asf_my_guid;
extern const ff_asf_guid ff_asf_language_guid;
+extern const ff_asf_guid ff_asf_content_encryption;
+extern const ff_asf_guid ff_asf_ext_content_encryption;
+extern const ff_asf_guid ff_asf_digital_signature;
extern const AVMetadataConv ff_asf_metadata_conv[];
diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 08f0d6586bf..543faf29d4c 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -532,6 +532,15 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
} else if (url_feof(pb)) {
return -1;
} else {
+ if (!s->keylen) {
+ if (!guidcmp(&g, &ff_asf_content_encryption)) {
+ av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
+ } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
+ av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
+ } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
+ av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
+ }
+ }
url_fseek(pb, gsize - 24, SEEK_CUR);
}
}
--
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