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 <binder/Parcel.h>
#include <binder/IMemory.h>
#include <media/IMediaPlayerService.h>
#include <media/IMediaRecorder.h>
#include <media/IOMX.h>

#include <utils/Errors.h>  // for status_t

namespace android {

enum {
    CREATE_URL = IBinder::FIRST_CALL_TRANSACTION,
    CREATE_FD,
    DECODE_URL,
    DECODE_FD,
    CREATE_MEDIA_RECORDER,
    CREATE_METADATA_RETRIEVER,
    GET_OMX,
    SNOOP
};

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

    virtual sp<IMediaMetadataRetriever> createMetadataRetriever(pid_t pid)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeInt32(pid);
        remote()->transact(CREATE_METADATA_RETRIEVER, data, &reply);
        return interface_cast<IMediaMetadataRetriever>(reply.readStrongBinder());
    }

    virtual sp<IMediaPlayer> create(
            pid_t pid, const sp<IMediaPlayerClient>& client,
            const char* url, const KeyedVector<String8, String8> *headers, int audioSessionId) {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeInt32(pid);
        data.writeStrongBinder(client->asBinder());
        data.writeCString(url);

        if (headers == NULL) {
            data.writeInt32(0);
        } else {
            // serialize the headers
            data.writeInt32(headers->size());
            for (size_t i = 0; i < headers->size(); ++i) {
                data.writeString8(headers->keyAt(i));
                data.writeString8(headers->valueAt(i));
            }
        }
        data.writeInt32(audioSessionId);

        remote()->transact(CREATE_URL, data, &reply);

        return interface_cast<IMediaPlayer>(reply.readStrongBinder());
    }

    virtual sp<IMediaRecorder> createMediaRecorder(pid_t pid)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        data.writeInt32(pid);
        remote()->transact(CREATE_MEDIA_RECORDER, data, &reply);
        return interface_cast<IMediaRecorder>(reply.readStrongBinder());
    }

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

        remote()->transact(CREATE_FD, data, &reply);

        return interface_cast<IMediaPlayer>(reply.readStrongBinder());;
    }

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

    virtual sp<IMemory> snoop()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        remote()->transact(SNOOP, data, &reply);
        return interface_cast<IMemory>(reply.readStrongBinder());
    }

    virtual sp<IOMX> getOMX() {
        Parcel data, reply;
        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
        remote()->transact(GET_OMX, data, &reply);
        return interface_cast<IOMX>(reply.readStrongBinder());
    }
};

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

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

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();

            KeyedVector<String8, String8> headers;
            int32_t numHeaders = data.readInt32();
            for (int i = 0; i < numHeaders; ++i) {
                String8 key = data.readString8();
                String8 value = data.readString8();
                headers.add(key, value);
            }
            int audioSessionId = data.readInt32();

            sp<IMediaPlayer> player = create(
                    pid, client, url, numHeaders > 0 ? &headers : NULL, audioSessionId);

            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();
            int audioSessionId = data.readInt32();

            sp<IMediaPlayer> player = create(pid, client, fd, offset, length, audioSessionId);
            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;
            int format;
            sp<IMemory> player = decode(url, &sampleRate, &numChannels, &format);
            reply->writeInt32(sampleRate);
            reply->writeInt32(numChannels);
            reply->writeInt32(format);
            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;
            int format;
            sp<IMemory> player = decode(fd, offset, length, &sampleRate, &numChannels, &format);
            reply->writeInt32(sampleRate);
            reply->writeInt32(numChannels);
            reply->writeInt32(format);
            reply->writeStrongBinder(player->asBinder());
            return NO_ERROR;
        } break;
        case SNOOP: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            sp<IMemory> snooped_audio = snoop();
            reply->writeStrongBinder(snooped_audio->asBinder());
            return NO_ERROR;
        } break;
        case CREATE_MEDIA_RECORDER: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            pid_t pid = data.readInt32();
            sp<IMediaRecorder> recorder = createMediaRecorder(pid);
            reply->writeStrongBinder(recorder->asBinder());
            return NO_ERROR;
        } break;
        case CREATE_METADATA_RETRIEVER: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            pid_t pid = data.readInt32();
            sp<IMediaMetadataRetriever> retriever = createMetadataRetriever(pid);
            reply->writeStrongBinder(retriever->asBinder());
            return NO_ERROR;
        } break;
        case GET_OMX: {
            CHECK_INTERFACE(IMediaPlayerService, data, reply);
            sp<IOMX> omx = getOMX();
            reply->writeStrongBinder(omx->asBinder());
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

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

}; // namespace android