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      1 /*
      2 **
      3 ** Copyright 2007, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #define LOG_TAG "IMediaExtractorService"
     19 //#define LOG_NDEBUG 0
     20 
     21 #include <utils/Log.h>
     22 #include <stdint.h>
     23 #include <sys/types.h>
     24 #include <binder/Parcel.h>
     25 #include <media/IMediaExtractorService.h>
     26 
     27 namespace android {
     28 
     29 enum {
     30     MAKE_EXTRACTOR = IBinder::FIRST_CALL_TRANSACTION
     31 };
     32 
     33 class BpMediaExtractorService : public BpInterface<IMediaExtractorService>
     34 {
     35 public:
     36     BpMediaExtractorService(const sp<IBinder>& impl)
     37         : BpInterface<IMediaExtractorService>(impl)
     38     {
     39     }
     40 
     41     virtual sp<IMediaExtractor> makeExtractor(const sp<IDataSource> &source, const char *mime) {
     42         Parcel data, reply;
     43         data.writeInterfaceToken(IMediaExtractorService::getInterfaceDescriptor());
     44         data.writeStrongBinder(IInterface::asBinder(source));
     45         if (mime != NULL) {
     46             data.writeCString(mime);
     47         }
     48         status_t ret = remote()->transact(MAKE_EXTRACTOR, data, &reply);
     49         if (ret == NO_ERROR) {
     50             return interface_cast<IMediaExtractor>(reply.readStrongBinder());
     51         }
     52         return NULL;
     53     }
     54 
     55 };
     56 
     57 IMPLEMENT_META_INTERFACE(MediaExtractorService, "android.media.IMediaExtractorService");
     58 
     59 // ----------------------------------------------------------------------
     60 
     61 status_t BnMediaExtractorService::onTransact(
     62     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
     63 {
     64     switch (code) {
     65 
     66         case MAKE_EXTRACTOR: {
     67             CHECK_INTERFACE(IMediaExtractorService, data, reply);
     68             sp<IBinder> b;
     69             status_t ret = data.readStrongBinder(&b);
     70             if (ret != NO_ERROR || b == NULL) {
     71                 ALOGE("Error reading source from parcel");
     72                 return ret;
     73             }
     74             // If we make an extractor through Binder, enabled shared memory
     75             // for MediaBuffers for this process.
     76             MediaBuffer::useSharedMemory();
     77             sp<IDataSource> source = interface_cast<IDataSource>(b);
     78             const char *mime = data.readCString();
     79             sp<IMediaExtractor> ex = makeExtractor(source, mime);
     80             reply->writeStrongBinder(IInterface::asBinder(ex));
     81             return NO_ERROR;
     82         }
     83         default:
     84             return BBinder::onTransact(code, data, reply, flags);
     85     }
     86 }
     87 
     88 // ----------------------------------------------------------------------------
     89 
     90 } // namespace android
     91