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Use define for drm property keys instead of defining as char pointers

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When defined as char pointers, every compilation unit that includes
the NdkMediaDrm.h header defines a new copy of the same global
variables - leading to linker errors due to multiple definitions
if more than one file includes it.

By using a define, they don't generate any symbols. The NdkMediaFormat.h
header uses extern const char* for a similar set of keys, but that
can't be added after the actual platform has shipped. The other
alternative would be to declare them as static const char*, which
wouldn't generate global symbols, but which could trigger warnings
about unused static symbols instead.

The same change has already been applied in frameworks/av in
https://android-review.googlesource.com/120303.

Change-Id: I14ca81d94309b7f437b3bc144920c48a8b3f0261
This commit is contained in:
Martin Storsjo
2014-11-27 22:51:14 +02:00
parent e5ede93a47
commit 2202e9414a
1 changed files with 5 additions and 5 deletions
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10
ndk/platforms/android-21/include/media/NdkMediaDrm.h
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@@ -327,24 +327,24 @@ media_status_t AMediaDrm_releaseSecureStops(AMediaDrm *,
/**
* String property name: identifies the maker of the DRM engine plugin
*/
const char *PROPERTY_VENDOR = "vendor";
#define PROPERTY_VENDOR "vendor"
/**
* String property name: identifies the version of the DRM engine plugin
*/
const char *PROPERTY_VERSION = "version";
#define PROPERTY_VERSION "version"
/**
* String property name: describes the DRM engine plugin
*/
const char *PROPERTY_DESCRIPTION = "description";
#define PROPERTY_DESCRIPTION "description"
/**
* String property name: a comma-separated list of cipher and mac algorithms
* supported by CryptoSession. The list may be empty if the DRM engine
* plugin does not support CryptoSession operations.
*/
const char *PROPERTY_ALGORITHMS = "algorithms";
#define PROPERTY_ALGORITHMS "algorithms"
/**
* Read a DRM engine plugin String property value, given the property name string.
@@ -361,7 +361,7 @@ media_status_t AMediaDrm_getPropertyString(AMediaDrm *, const char *propertyName
* Byte array property name: the device unique identifier is established during
* device provisioning and provides a means of uniquely identifying each device.
*/
const char *PROPERTY_DEVICE_UNIQUE_ID = "deviceUniqueId";
#define PROPERTY_DEVICE_UNIQUE_ID "deviceUniqueId"
/**
* Read a DRM engine plugin byte array property value, given the property name string.