Re: [FFmpeg-devel] [PATCH 2/2] avcodec/mediacodecdec: check ff_Build_SDK_INT return value

["\"zhilizhao(赵志立)\"" <quinkblack@foxmail.com>]

> On Jan 9, 2023, at 20:34, Tomas Härdin <git@haerdin.se> wrote:
> 
> tis 2023-01-10 klockan 00:36 +0800 skrev Zhao Zhili:
>> From: Zhao Zhili <zhilizhao@tencent.com>
>> 
>> Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
>> ---
>>  libavcodec/mediacodecdec.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/libavcodec/mediacodecdec.c b/libavcodec/mediacodecdec.c
>> index 11f655a9aa..6ef23d7369 100644
>> --- a/libavcodec/mediacodecdec.c
>> +++ b/libavcodec/mediacodecdec.c
>> @@ -415,7 +415,7 @@ static av_cold int
>> mediacodec_decode_init(AVCodecContext *avctx)
>>             s->ctx->codec_name, ret);
>>  
>>      sdk_int = ff_Build_SDK_INT(avctx);
>> -    if (sdk_int <= 23 &&
>> +    if (sdk_int > 0 && sdk_int <= 23 &&
>>          strcmp(s->ctx->codec_name,
>> "OMX.amlogic.mpeg2.decoder.awesome") == 0) {
>>          av_log(avctx, AV_LOG_INFO, "Enabling workaround for %s on
>> API=%d\n",
>>                 s->ctx->codec_name, sdk_int);
> 
> Maybe it should bail out if it can't figure out the SDK level?

ff_Build_SDK_INT always fail when JVM isn’t available and target
api level < 24. If there are more usecases of ff_Build_SDK_INT(),
we might make it more robust.

For current use case:
1. If JVM is available, ff_Build_SDK_INT() should success, nothing changed.
2. If JVM is unavailable, sdk_int > 0 && sdk_int <= 23 should always be false,
since android_get_device_api_level() only available after API >= 24. Then
amlogic_mpeg2_api23_workaround doesn’t work. Even if we can make ff_Build_SDK_INT()
works when API < 24, get codec name doesn’t work, then amlogic_mpeg2_api23_workaround
doesn’t work neither. I don’t think it’s a serious issue. Old usecase with JNI
works, and this special workaround might not necessary now. 

The patch fixed a hypothetical case when the codec is OMX.amlogic.mpeg2.decoder.awesome
and the device api level >= 28 (get codec name works after API >= 28),
amlogic_mpeg2_api23_workaround is enabled (which shouldn’t).

> 
> /Tomas
> 
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