media/libmedia/IAudioTrack.cpp

/*
**
** Copyright 2007, 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.
*/

#define LOG_TAG "IAudioTrack"
//#define LOG_NDEBUG 0
#include <utils/Log.h>

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

#include <binder/Parcel.h>

#include <media/IAudioTrack.h>

namespace android {

enum {
    GET_CBLK = IBinder::FIRST_CALL_TRANSACTION,
    START,
    STOP,
    FLUSH,
    RESERVED, // was MUTE
    PAUSE,
    ATTACH_AUX_EFFECT,
    SET_PARAMETERS,
    GET_TIMESTAMP,
    SIGNAL,
};

class BpAudioTrack : public BpInterface<IAudioTrack>
{
public:
    BpAudioTrack(const sp<IBinder>& impl)
        : BpInterface<IAudioTrack>(impl)
    {
    }

    virtual sp<IMemory> getCblk() const
    {
        Parcel data, reply;
        sp<IMemory> cblk;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        status_t status = remote()->transact(GET_CBLK, data, &reply);
        if (status == NO_ERROR) {
            cblk = interface_cast<IMemory>(reply.readStrongBinder());
            if (cblk != 0 && cblk->pointer() == NULL) {
                cblk.clear();
            }
        }
        return cblk;
    }

    virtual status_t start()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        status_t status = remote()->transact(START, data, &reply);
        if (status == NO_ERROR) {
            status = reply.readInt32();
        } else {
            ALOGW("start() error: %s", strerror(-status));
        }
        return status;
    }

    virtual void stop()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        remote()->transact(STOP, data, &reply);
    }

    virtual void flush()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        remote()->transact(FLUSH, data, &reply);
    }

    virtual void pause()
    {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        remote()->transact(PAUSE, data, &reply);
    }

    virtual status_t attachAuxEffect(int effectId)
    {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        data.writeInt32(effectId);
        status_t status = remote()->transact(ATTACH_AUX_EFFECT, data, &reply);
        if (status == NO_ERROR) {
            status = reply.readInt32();
        } else {
            ALOGW("attachAuxEffect() error: %s", strerror(-status));
        }
        return status;
    }

    virtual status_t setParameters(const String8& keyValuePairs) {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        data.writeString8(keyValuePairs);
        status_t status = remote()->transact(SET_PARAMETERS, data, &reply);
        if (status == NO_ERROR) {
            status = reply.readInt32();
        }
        return status;
    }

    virtual status_t getTimestamp(AudioTimestamp& timestamp) {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        status_t status = remote()->transact(GET_TIMESTAMP, data, &reply);
        if (status == NO_ERROR) {
            status = reply.readInt32();
            if (status == NO_ERROR) {
                timestamp.mPosition = reply.readInt32();
                timestamp.mTime.tv_sec = reply.readInt32();
                timestamp.mTime.tv_nsec = reply.readInt32();
            }
        }
        return status;
    }

    virtual void signal() {
        Parcel data, reply;
        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
        remote()->transact(SIGNAL, data, &reply);
    }
};

IMPLEMENT_META_INTERFACE(AudioTrack, "android.media.IAudioTrack");

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

status_t BnAudioTrack::onTransact(
    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
    switch (code) {
        case GET_CBLK: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            reply->writeStrongBinder(IInterface::asBinder(getCblk()));
            return NO_ERROR;
        } break;
        case START: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            reply->writeInt32(start());
            return NO_ERROR;
        } break;
        case STOP: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            stop();
            return NO_ERROR;
        } break;
        case FLUSH: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            flush();
            return NO_ERROR;
        } break;
        case PAUSE: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            pause();
            return NO_ERROR;
        }
        case ATTACH_AUX_EFFECT: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            reply->writeInt32(attachAuxEffect(data.readInt32()));
            return NO_ERROR;
        } break;
        case SET_PARAMETERS: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            String8 keyValuePairs(data.readString8());
            reply->writeInt32(setParameters(keyValuePairs));
            return NO_ERROR;
        } break;
        case GET_TIMESTAMP: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            AudioTimestamp timestamp;
            status_t status = getTimestamp(timestamp);
            reply->writeInt32(status);
            if (status == NO_ERROR) {
                reply->writeInt32(timestamp.mPosition);
                reply->writeInt32(timestamp.mTime.tv_sec);
                reply->writeInt32(timestamp.mTime.tv_nsec);
            }
            return NO_ERROR;
        } break;
        case SIGNAL: {
            CHECK_INTERFACE(IAudioTrack, data, reply);
            signal();
            return NO_ERROR;
        } break;
        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

} // namespace android