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Detect Windows Media DRM protected files and display warning if no key

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was provided.

Patch by Daniel G. Taylor, dan programmer-art org

Originally committed as revision 20209 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Daniel G. Taylor 2009-10-11 23:09:33 +00:00 committed by Carl Eugen Hoyos
parent 0115b3eadb
commit febd1c90a6
3 changed files with 24 additions and 0 deletions
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12
libavformat/asf.c
View File

@ -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" },

3
libavformat/asf.h
View File

@ -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[];

9
libavformat/asfdec.c
View File

@ -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);
}
}