[FFmpeg-devel] [PATCH v2 1/2] avcodec/mediacodec_wrapper: get api level via NDK method

[FFmpeg-devel] [PATCH v2 1/2] avcodec/mediacodec_wrapper: get api level via NDK method

[Zhao Zhili]

From: Zhao Zhili <zhilizhao@tencent.com>

android_get_device_api_level() is a static inline before API level
29. It was implemented via __system_property_get(). We can do the
same thing, but I don't want to mess up with __system_property_get.
---
 libavcodec/mediacodec_wrapper.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/libavcodec/mediacodec_wrapper.c b/libavcodec/mediacodec_wrapper.c
index 4d6e9487b8..34ec2134aa 100644
--- a/libavcodec/mediacodec_wrapper.c
+++ b/libavcodec/mediacodec_wrapper.c
@@ -2513,6 +2513,21 @@ FFAMediaCodec* ff_AMediaCodec_createEncoderByType(const char *mime_type, int ndk
 int ff_Build_SDK_INT(AVCodecContext *avctx)
 {
     int ret = -1;
+
+#if __ANDROID_API__ >= 24
+    // android_get_device_api_level() is a static inline before API level 29.
+    // dlsym() might doesn't work.
+    //
+    // We can implement android_get_device_api_level() by
+    // __system_property_get(), but __system_property_get() has created a lot of
+    // troubles and is deprecated. So avoid using __system_property_get() for
+    // now.
+    //
+    // Hopy we can remove the conditional compilation finally by bumping the
+    // required API level.
+    //
+    ret = android_get_device_api_level();
+#else
     JNIEnv *env = NULL;
     jclass versionClass;
     jfieldID sdkIntFieldID;
@@ -2522,5 +2537,8 @@ int ff_Build_SDK_INT(AVCodecContext *avctx)
     sdkIntFieldID = (*env)->GetStaticFieldID(env, versionClass, "SDK_INT", "I");
     ret = (*env)->GetStaticIntField(env, versionClass, sdkIntFieldID);
     (*env)->DeleteLocalRef(env, versionClass);
+#endif
+    av_log(avctx, AV_LOG_DEBUG, "device api level %d\n", ret);
+
     return ret;
 }
-- 
2.25.1

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Re: [FFmpeg-devel] [PATCH v2 1/2] avcodec/mediacodec_wrapper: get api level via NDK method

[Tomas Härdin]

tis 2023-01-10 klockan 19:30 +0800 skrev Zhao Zhili:
> From: Zhao Zhili <zhilizhao@tencent.com>
> 
> android_get_device_api_level() is a static inline before API level
> 29. It was implemented via __system_property_get(). We can do the
> same thing, but I don't want to mess up with __system_property_get.
> ---
>  libavcodec/mediacodec_wrapper.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/libavcodec/mediacodec_wrapper.c
> b/libavcodec/mediacodec_wrapper.c
> index 4d6e9487b8..34ec2134aa 100644
> --- a/libavcodec/mediacodec_wrapper.c
> +++ b/libavcodec/mediacodec_wrapper.c
> @@ -2513,6 +2513,21 @@ FFAMediaCodec*
> ff_AMediaCodec_createEncoderByType(const char *mime_type, int ndk
>  int ff_Build_SDK_INT(AVCodecContext *avctx)
>  {
>      int ret = -1;
> +
> +#if __ANDROID_API__ >= 24
> +    // android_get_device_api_level() is a static inline before API
> level 29.
> +    // dlsym() might doesn't work.
> +    //
> +    // We can implement android_get_device_api_level() by
> +    // __system_property_get(), but __system_property_get() has
> created a lot of
> +    // troubles and is deprecated. So avoid using
> __system_property_get() for
> +    // now.
> +    //
> +    // Hopy we can remove the conditional compilation finally by
> bumping the
> +    // required API level.
> +    //
> +    ret = android_get_device_api_level();
> +#else
>      JNIEnv *env = NULL;
>      jclass versionClass;
>      jfieldID sdkIntFieldID;
> @@ -2522,5 +2537,8 @@ int ff_Build_SDK_INT(AVCodecContext *avctx)
>      sdkIntFieldID = (*env)->GetStaticFieldID(env, versionClass,
> "SDK_INT", "I");
>      ret = (*env)->GetStaticIntField(env, versionClass,
> sdkIntFieldID);
>      (*env)->DeleteLocalRef(env, versionClass);
> +#endif
> +    av_log(avctx, AV_LOG_DEBUG, "device api level %d\n", ret);
> +
>      return ret;
>  }

Looks OK

/Tomas


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