android_frameworks_base/media/libmedia/IMediaPlayerService.cpp

/*
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

#include <stdint.h>
#include <sys/types.h>
#include <utils/Parcel.h>

#include <utils/IMemory.h>
#include <media/IMediaPlayerService.h>

namespace android {

enum {
    CREATE_URL = IBinder::FIRST_CALL_TRANSACTION,
    CREATE_FD,
    DECODE_URL,
    DECODE_FD,
};

class BpMediaPlayerService: public BpInterface<IMediaPlayerService>
{
public:
    BpMediaPlayerService(const sp<IBinder>& impl)
        : BpInterface<IMediaPlayerService>(impl)
    {
    }

    virtual sp<IMediaPlayer> create(pid_t pid, const sp<IMediaPlayerClient>& client, const char* url)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeInt32(pid);
        data.writeStrongBinder(client->asBinder());
        data.writeCString(url);
        remote()->transact(CREATE_URL, data, &reply);
        return interface_cast<IMediaPlayer>(reply.readStrongBinder());
    }

    virtual sp<IMediaPlayer> create(pid_t pid, const sp<IMediaPlayerClient>& client, int fd, int64_t offset, int64_t length)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeInt32(pid);
        data.writeStrongBinder(client->asBinder());
        data.writeFileDescriptor(fd);
        data.writeInt64(offset);
        data.writeInt64(length);
        remote()->transact(CREATE_FD, data, &reply);
        return interface_cast<IMediaPlayer>(reply.readStrongBinder());
    }

    virtual sp<IMemory> decode(const char* url, uint32_t *pSampleRate, int* pNumChannels)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeCString(url);
        remote()->transact(DECODE_URL, data, &reply);
        *pSampleRate = uint32_t(reply.readInt32());
        *pNumChannels = reply.readInt32();
        return interface_cast<IMemory>(reply.readStrongBinder());
    }

    virtual sp<IMemory> decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeFileDescriptor(fd);
        data.writeInt64(offset);
        data.writeInt64(length);
        remote()->transact(DECODE_FD, data, &reply);
        *pSampleRate = uint32_t(reply.readInt32());
        *pNumChannels = reply.readInt32();
        return interface_cast<IMemory>(reply.readStrongBinder());
    }
};

IMPLEMENT_META_INTERFACE(MediaPlayerService, "android.hardware.IMediaPlayerService");

// ----------------------------------------------------------------------

#define CHECK_INTERFACE(interface, data, reply) \
        do { if (!data.enforceInterface(interface::getInterfaceDescriptor())) { \
            LOGW("Call incorrectly routed to " #interface); \
            return PERMISSION_DENIED; \
        } } while (0)

status_t BnMediaPlayerService::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch(code) {
        case CREATE_URL: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            pid_t pid = data.readInt32();
            sp<IMediaPlayerClient> client = interface_cast<IMediaPlayerClient>(data.readStrongBinder());
            const char* url = data.readCString();
            sp<IMediaPlayer> player = create(pid, client, url);
            reply->writeStrongBinder(player->asBinder());
            return NO_ERROR;
        } break;
        case CREATE_FD: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            pid_t pid = data.readInt32();
            sp<IMediaPlayerClient> client = interface_cast<IMediaPlayerClient>(data.readStrongBinder());
            int fd = dup(data.readFileDescriptor());
            int64_t offset = data.readInt64();
            int64_t length = data.readInt64();
            sp<IMediaPlayer> player = create(pid, client, fd, offset, length);
            reply->writeStrongBinder(player->asBinder());
            return NO_ERROR;
        } break;
        case DECODE_URL: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            const char* url = data.readCString();
            uint32_t sampleRate;
            int numChannels;
            sp<IMemory> player = decode(url, &sampleRate, &numChannels);
            reply->writeInt32(sampleRate);
            reply->writeInt32(numChannels);
            reply->writeStrongBinder(player->asBinder());
            return NO_ERROR;
        } break;
        case DECODE_FD: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            int fd = dup(data.readFileDescriptor());
            int64_t offset = data.readInt64();
            int64_t length = data.readInt64();
            uint32_t sampleRate;
            int numChannels;
            sp<IMemory> player = decode(fd, offset, length, &sampleRate, &numChannels);
            reply->writeInt32(sampleRate);
            reply->writeInt32(numChannels);
            reply->writeStrongBinder(player->asBinder());
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

// ----------------------------------------------------------------------------

}; // namespace android