0f9a53d499
This patch modifies the native binder interface to the metadata retriever to pass the caller's thread group across the binder interface. On the server side, the thread scheduler group is set to the caller's scheduler group temporarily and restored after the request has completed. This patch also reverts a previous patch where the priority of the thread was forced to a low priority foreground thread. This should give apps more control over the priority of their metadata retrieval, particularly allow background process to run without hogging the CPU.
284 lines
8.8 KiB
C++
284 lines
8.8 KiB
C++
/*
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**
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** Copyright (C) 2008 The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stdint.h>
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#include <sys/types.h>
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#include <binder/Parcel.h>
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#include <SkBitmap.h>
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#include <media/IMediaMetadataRetriever.h>
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// The binder is supposed to propagate the scheduler group across
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// the binder interface so that remote calls are executed with
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// the same priority as local calls. This is currently not working
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// so this change puts in a temporary hack to fix the issue with
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// metadata retrieval which can be a huge CPU hit if done on a
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// foreground thread.
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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/* desktop Linux needs a little help with gettid() */
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#if defined(HAVE_GETTID) && !defined(HAVE_ANDROID_OS)
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#define __KERNEL__
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# include <linux/unistd.h>
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#ifdef _syscall0
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_syscall0(pid_t,gettid)
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#else
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pid_t gettid() { return syscall(__NR_gettid);}
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#endif
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#undef __KERNEL__
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#endif
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#define LOG_TAG "IMediaMetadataRetriever"
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#include <utils/Log.h>
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#include <cutils/sched_policy.h>
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namespace android {
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static void sendSchedPolicy(Parcel& data)
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{
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SchedPolicy policy;
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get_sched_policy(gettid(), &policy);
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data.writeInt32(policy);
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}
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static void setSchedPolicy(const Parcel& data)
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{
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SchedPolicy policy = (SchedPolicy) data.readInt32();
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set_sched_policy(gettid(), policy);
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}
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static void restoreSchedPolicy()
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{
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set_sched_policy(gettid(), SP_FOREGROUND);
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}
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}; // end namespace android
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#endif
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namespace android {
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enum {
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DISCONNECT = IBinder::FIRST_CALL_TRANSACTION,
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SET_DATA_SOURCE_URL,
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SET_DATA_SOURCE_FD,
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SET_MODE,
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GET_MODE,
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CAPTURE_FRAME,
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EXTRACT_ALBUM_ART,
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EXTRACT_METADATA,
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};
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class BpMediaMetadataRetriever: public BpInterface<IMediaMetadataRetriever>
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{
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public:
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BpMediaMetadataRetriever(const sp<IBinder>& impl)
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: BpInterface<IMediaMetadataRetriever>(impl)
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{
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}
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// disconnect from media metadata retriever service
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void disconnect()
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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remote()->transact(DISCONNECT, data, &reply);
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}
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status_t setDataSource(const char* srcUrl)
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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data.writeCString(srcUrl);
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remote()->transact(SET_DATA_SOURCE_URL, data, &reply);
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return reply.readInt32();
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}
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status_t setDataSource(int fd, int64_t offset, int64_t length)
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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data.writeFileDescriptor(fd);
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data.writeInt64(offset);
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data.writeInt64(length);
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remote()->transact(SET_DATA_SOURCE_FD, data, &reply);
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return reply.readInt32();
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}
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status_t setMode(int mode)
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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data.writeInt32(mode);
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remote()->transact(SET_MODE, data, &reply);
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return reply.readInt32();
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}
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status_t getMode(int* mode) const
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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remote()->transact(GET_MODE, data, &reply);
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*mode = reply.readInt32();
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return reply.readInt32();
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}
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sp<IMemory> captureFrame()
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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sendSchedPolicy(data);
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#endif
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remote()->transact(CAPTURE_FRAME, data, &reply);
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status_t ret = reply.readInt32();
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if (ret != NO_ERROR) {
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return NULL;
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}
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return interface_cast<IMemory>(reply.readStrongBinder());
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}
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sp<IMemory> extractAlbumArt()
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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sendSchedPolicy(data);
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#endif
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remote()->transact(EXTRACT_ALBUM_ART, data, &reply);
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status_t ret = reply.readInt32();
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if (ret != NO_ERROR) {
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return NULL;
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}
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return interface_cast<IMemory>(reply.readStrongBinder());
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}
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const char* extractMetadata(int keyCode)
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{
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Parcel data, reply;
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data.writeInterfaceToken(IMediaMetadataRetriever::getInterfaceDescriptor());
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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sendSchedPolicy(data);
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#endif
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data.writeInt32(keyCode);
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remote()->transact(EXTRACT_METADATA, data, &reply);
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status_t ret = reply.readInt32();
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if (ret != NO_ERROR) {
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return NULL;
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}
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return reply.readCString();
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}
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};
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IMPLEMENT_META_INTERFACE(MediaMetadataRetriever, "android.media.IMediaMetadataRetriever");
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// ----------------------------------------------------------------------
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status_t BnMediaMetadataRetriever::onTransact(
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uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
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{
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switch (code) {
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case DISCONNECT: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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disconnect();
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return NO_ERROR;
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} break;
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case SET_DATA_SOURCE_URL: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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const char* srcUrl = data.readCString();
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reply->writeInt32(setDataSource(srcUrl));
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return NO_ERROR;
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} break;
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case SET_DATA_SOURCE_FD: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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int fd = dup(data.readFileDescriptor());
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int64_t offset = data.readInt64();
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int64_t length = data.readInt64();
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reply->writeInt32(setDataSource(fd, offset, length));
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return NO_ERROR;
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} break;
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case SET_MODE: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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int mode = data.readInt32();
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reply->writeInt32(setMode(mode));
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return NO_ERROR;
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} break;
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case GET_MODE: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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int mode;
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status_t status = getMode(&mode);
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reply->writeInt32(mode);
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reply->writeInt32(status);
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return NO_ERROR;
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} break;
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case CAPTURE_FRAME: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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setSchedPolicy(data);
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#endif
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sp<IMemory> bitmap = captureFrame();
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if (bitmap != 0) { // Don't send NULL across the binder interface
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reply->writeInt32(NO_ERROR);
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reply->writeStrongBinder(bitmap->asBinder());
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} else {
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reply->writeInt32(UNKNOWN_ERROR);
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}
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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restoreSchedPolicy();
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#endif
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return NO_ERROR;
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} break;
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case EXTRACT_ALBUM_ART: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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setSchedPolicy(data);
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#endif
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sp<IMemory> albumArt = extractAlbumArt();
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if (albumArt != 0) { // Don't send NULL across the binder interface
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reply->writeInt32(NO_ERROR);
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reply->writeStrongBinder(albumArt->asBinder());
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} else {
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reply->writeInt32(UNKNOWN_ERROR);
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}
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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restoreSchedPolicy();
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#endif
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return NO_ERROR;
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} break;
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case EXTRACT_METADATA: {
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CHECK_INTERFACE(IMediaMetadataRetriever, data, reply);
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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setSchedPolicy(data);
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#endif
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int keyCode = data.readInt32();
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const char* value = extractMetadata(keyCode);
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if (value != NULL) { // Don't send NULL across the binder interface
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reply->writeInt32(NO_ERROR);
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reply->writeCString(value);
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} else {
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reply->writeInt32(UNKNOWN_ERROR);
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}
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#ifndef DISABLE_GROUP_SCHEDULE_HACK
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restoreSchedPolicy();
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#endif
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return NO_ERROR;
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} break;
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default:
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return BBinder::onTransact(code, data, reply, flags);
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}
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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