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#include <media/stagefright/MediaExtractor.h> 27 28namespace android { 29 30enum { 31 MAKE_EXTRACTOR = IBinder::FIRST_CALL_TRANSACTION, 32 MAKE_IDATA_SOURCE_FD, 33}; 34 35class BpMediaExtractorService : public BpInterface<IMediaExtractorService> 36{ 37public: 38 explicit BpMediaExtractorService(const sp<IBinder>& impl) 39 : BpInterface<IMediaExtractorService>(impl) 40 { 41 } 42 43 virtual sp<IMediaExtractor> makeExtractor(const sp<IDataSource> &source, const char *mime) { 44 Parcel data, reply; 45 data.writeInterfaceToken(IMediaExtractorService::getInterfaceDescriptor()); 46 data.writeStrongBinder(IInterface::asBinder(source)); 47 if (mime != NULL) { 48 data.writeCString(mime); 49 } 50 status_t ret = remote()->transact(MAKE_EXTRACTOR, data, &reply); 51 if (ret == NO_ERROR) { 52 return interface_cast<IMediaExtractor>(reply.readStrongBinder()); 53 } 54 return NULL; 55 } 56 57 virtual sp<IDataSource> makeIDataSource(int fd, int64_t offset, int64_t length) 58 { 59 Parcel data, reply; 60 data.writeInterfaceToken(IMediaExtractorService::getInterfaceDescriptor()); 61 data.writeFileDescriptor(fd); 62 data.writeInt64(offset); 63 data.writeInt64(length); 64 status_t ret = remote()->transact(MAKE_IDATA_SOURCE_FD, data, &reply); 65 ALOGV("fd:%d offset:%lld length:%lld ret:%d", 66 fd, (long long)offset, (long long)length, ret); 67 if (ret == NO_ERROR) { 68 return interface_cast<IDataSource>(reply.readStrongBinder()); 69 } 70 return nullptr; 71 } 72}; 73 74IMPLEMENT_META_INTERFACE(MediaExtractorService, "android.media.IMediaExtractorService"); 75 76// ---------------------------------------------------------------------- 77 78status_t BnMediaExtractorService::onTransact( 79 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) 80{ 81 switch (code) { 82 83 case MAKE_EXTRACTOR: { 84 CHECK_INTERFACE(IMediaExtractorService, data, reply); 85 sp<IBinder> b; 86 status_t ret = data.readStrongBinder(&b); 87 if (ret != NO_ERROR || b == NULL) { 88 ALOGE("Error reading source from parcel"); 89 return ret; 90 } 91 // If we make an extractor through Binder, enabled shared memory 92 // for MediaBuffers for this process. 93 MediaBuffer::useSharedMemory(); 94 sp<IDataSource> source = interface_cast<IDataSource>(b); 95 const char *mime = data.readCString(); 96 sp<IMediaExtractor> ex = makeExtractor(source, mime); 97 reply->writeStrongBinder(IInterface::asBinder(ex)); 98 return NO_ERROR; 99 } 100 101 case MAKE_IDATA_SOURCE_FD: { 102 CHECK_INTERFACE(IMediaExtractorService, data, reply); 103 const int fd = dup(data.readFileDescriptor()); // -1 fd checked in makeIDataSource 104 const int64_t offset = data.readInt64(); 105 const int64_t length = data.readInt64(); 106 ALOGV("fd %d offset%lld length:%lld", fd, (long long)offset, (long long)length); 107 sp<IDataSource> source = makeIDataSource(fd, offset, length); 108 reply->writeStrongBinder(IInterface::asBinder(source)); 109 // The FileSource closes the descriptor, so if it is not created 110 // we need to close the descriptor explicitly. 111 if (source.get() == nullptr && fd != -1) { 112 close(fd); 113 } 114 return NO_ERROR; 115 } 116 117 default: 118 return BBinder::onTransact(code, data, reply, flags); 119 } 120} 121 122// ---------------------------------------------------------------------------- 123 124} // namespace android 125