media/libmedia/IOMX.cpp

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

#include <binder/IMemory.h>
#include <binder/Parcel.h>
#include <media/IOMX.h>
#include <surfaceflinger/ISurface.h>
#include <surfaceflinger/Surface.h>

namespace android {

enum {
    CONNECT = IBinder::FIRST_CALL_TRANSACTION,
    LIVES_LOCALLY,
    LIST_NODES,
    ALLOCATE_NODE,
    FREE_NODE,
    SEND_COMMAND,
    GET_PARAMETER,
    SET_PARAMETER,
    GET_CONFIG,
    SET_CONFIG,
    ENABLE_GRAPHIC_BUFFERS,
    USE_BUFFER,
    USE_GRAPHIC_BUFFER,
    STORE_META_DATA_IN_BUFFERS,
    ALLOC_BUFFER,
    ALLOC_BUFFER_WITH_BACKUP,
    FREE_BUFFER,
    FILL_BUFFER,
    EMPTY_BUFFER,
    GET_EXTENSION_INDEX,
    CREATE_RENDERER,
    OBSERVER_ON_MSG,
    RENDERER_RENDER,
};

sp<IOMXRenderer> IOMX::createRenderer(
        const sp<Surface> &surface,
        const char *componentName,
        OMX_COLOR_FORMATTYPE colorFormat,
        size_t encodedWidth, size_t encodedHeight,
        size_t displayWidth, size_t displayHeight) {
    return createRenderer(
            surface->getISurface(),
            componentName, colorFormat, encodedWidth, encodedHeight,
            displayWidth, displayHeight);
}

sp<IOMXRenderer> IOMX::createRendererFromJavaSurface(
        JNIEnv *env, jobject javaSurface,
        const char *componentName,
        OMX_COLOR_FORMATTYPE colorFormat,
        size_t encodedWidth, size_t encodedHeight,
        size_t displayWidth, size_t displayHeight) {
    jclass surfaceClass = env->FindClass("android/view/Surface");
    if (surfaceClass == NULL) {
        LOGE("Can't find android/view/Surface");
        return NULL;
    }

    jfieldID surfaceID = env->GetFieldID(surfaceClass, ANDROID_VIEW_SURFACE_JNI_ID, "I");
    if (surfaceID == NULL) {
        LOGE("Can't find Surface.mSurface");
        return NULL;
    }

    sp<Surface> surface = (Surface *)env->GetIntField(javaSurface, surfaceID);

    return createRenderer(
            surface, componentName, colorFormat, encodedWidth,
            encodedHeight, displayWidth, displayHeight);
}

class BpOMX : public BpInterface<IOMX> {
public:
    BpOMX(const sp<IBinder> &impl)
        : BpInterface<IOMX>(impl) {
    }

    virtual bool livesLocally(pid_t pid) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeInt32(pid);
        remote()->transact(LIVES_LOCALLY, data, &reply);

        return reply.readInt32() != 0;
    }

    virtual status_t listNodes(List<ComponentInfo> *list) {
        list->clear();

        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        remote()->transact(LIST_NODES, data, &reply);

        int32_t n = reply.readInt32();
        for (int32_t i = 0; i < n; ++i) {
            list->push_back(ComponentInfo());
            ComponentInfo &info = *--list->end();

            info.mName = reply.readString8();
            int32_t numRoles = reply.readInt32();
            for (int32_t j = 0; j < numRoles; ++j) {
                info.mRoles.push_back(reply.readString8());
            }
        }

        return OK;
    }

    virtual status_t allocateNode(
            const char *name, const sp<IOMXObserver> &observer, node_id *node) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeCString(name);
        data.writeStrongBinder(observer->asBinder());
        remote()->transact(ALLOCATE_NODE, data, &reply);

        status_t err = reply.readInt32();
        if (err == OK) {
            *node = (void*)reply.readIntPtr();
        } else {
            *node = 0;
        }

        return err;
    }

    virtual status_t freeNode(node_id node) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        remote()->transact(FREE_NODE, data, &reply);

        return reply.readInt32();
    }

    virtual status_t sendCommand(
            node_id node, OMX_COMMANDTYPE cmd, OMX_S32 param) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(cmd);
        data.writeInt32(param);
        remote()->transact(SEND_COMMAND, data, &reply);

        return reply.readInt32();
    }

    virtual status_t getParameter(
            node_id node, OMX_INDEXTYPE index,
            void *params, size_t size) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(index);
        data.writeInt32(size);
        data.write(params, size);
        remote()->transact(GET_PARAMETER, data, &reply);

        status_t err = reply.readInt32();
        if (err != OK) {
            return err;
        }

        reply.read(params, size);

        return OK;
    }

    virtual status_t setParameter(
            node_id node, OMX_INDEXTYPE index,
            const void *params, size_t size) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(index);
        data.writeInt32(size);
        data.write(params, size);
        remote()->transact(SET_PARAMETER, data, &reply);

        return reply.readInt32();
    }

    virtual status_t getConfig(
            node_id node, OMX_INDEXTYPE index,
            void *params, size_t size) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(index);
        data.writeInt32(size);
        data.write(params, size);
        remote()->transact(GET_CONFIG, data, &reply);

        status_t err = reply.readInt32();
        if (err != OK) {
            return err;
        }

        reply.read(params, size);

        return OK;
    }

    virtual status_t setConfig(
            node_id node, OMX_INDEXTYPE index,
            const void *params, size_t size) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(index);
        data.writeInt32(size);
        data.write(params, size);
        remote()->transact(SET_CONFIG, data, &reply);

        return reply.readInt32();
    }

    virtual status_t enableGraphicBuffers(
            node_id node, OMX_U32 port_index, OMX_BOOL enable) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.writeInt32((uint32_t)enable);
        remote()->transact(ENABLE_GRAPHIC_BUFFERS, data, &reply);

        status_t err = reply.readInt32();
        return err;
    }

    virtual status_t useBuffer(
            node_id node, OMX_U32 port_index, const sp<IMemory> &params,
            buffer_id *buffer) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.writeStrongBinder(params->asBinder());
        remote()->transact(USE_BUFFER, data, &reply);

        status_t err = reply.readInt32();
        if (err != OK) {
            *buffer = 0;

            return err;
        }

        *buffer = (void*)reply.readIntPtr();

        return err;
    }


    virtual status_t useGraphicBuffer(
            node_id node, OMX_U32 port_index,
            const sp<GraphicBuffer> &graphicBuffer, buffer_id *buffer) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.write(*graphicBuffer);
        remote()->transact(USE_GRAPHIC_BUFFER, data, &reply);

        status_t err = reply.readInt32();
        if (err != OK) {
            *buffer = 0;

            return err;
        }

        *buffer = (void*)reply.readIntPtr();

        return err;
    }

    virtual status_t storeMetaDataInBuffers(
            node_id node, OMX_U32 port_index, OMX_BOOL enable) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.writeInt32((uint32_t)enable);
        remote()->transact(STORE_META_DATA_IN_BUFFERS, data, &reply);

        status_t err = reply.readInt32();
        return err;
    }

    virtual status_t allocateBuffer(
            node_id node, OMX_U32 port_index, size_t size,
            buffer_id *buffer, void **buffer_data) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.writeInt32(size);
        remote()->transact(ALLOC_BUFFER, data, &reply);

        status_t err = reply.readInt32();
        if (err != OK) {
            *buffer = 0;

            return err;
        }

        *buffer = (void *)reply.readIntPtr();
        *buffer_data = (void *)reply.readIntPtr();

        return err;
    }

    virtual status_t allocateBufferWithBackup(
            node_id node, OMX_U32 port_index, const sp<IMemory> &params,
            buffer_id *buffer) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.writeStrongBinder(params->asBinder());
        remote()->transact(ALLOC_BUFFER_WITH_BACKUP, data, &reply);

        status_t err = reply.readInt32();
        if (err != OK) {
            *buffer = 0;

            return err;
        }

        *buffer = (void*)reply.readIntPtr();

        return err;
    }

    virtual status_t freeBuffer(
            node_id node, OMX_U32 port_index, buffer_id buffer) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeInt32(port_index);
        data.writeIntPtr((intptr_t)buffer);
        remote()->transact(FREE_BUFFER, data, &reply);

        return reply.readInt32();
    }

    virtual status_t fillBuffer(node_id node, buffer_id buffer) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeIntPtr((intptr_t)buffer);
        remote()->transact(FILL_BUFFER, data, &reply);

        return reply.readInt32();
    }

    virtual status_t emptyBuffer(
            node_id node,
            buffer_id buffer,
            OMX_U32 range_offset, OMX_U32 range_length,
            OMX_U32 flags, OMX_TICKS timestamp) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeIntPtr((intptr_t)buffer);
        data.writeInt32(range_offset);
        data.writeInt32(range_length);
        data.writeInt32(flags);
        data.writeInt64(timestamp);
        remote()->transact(EMPTY_BUFFER, data, &reply);

        return reply.readInt32();
    }

    virtual status_t getExtensionIndex(
            node_id node,
            const char *parameter_name,
            OMX_INDEXTYPE *index) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)node);
        data.writeCString(parameter_name);

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

        status_t err = reply.readInt32();
        if (err == OK) {
            *index = static_cast<OMX_INDEXTYPE>(reply.readInt32());
        } else {
            *index = OMX_IndexComponentStartUnused;
        }

        return err;
    }

    virtual sp<IOMXRenderer> createRenderer(
            const sp<ISurface> &surface,
            const char *componentName,
            OMX_COLOR_FORMATTYPE colorFormat,
            size_t encodedWidth, size_t encodedHeight,
            size_t displayWidth, size_t displayHeight) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMX::getInterfaceDescriptor());

        data.writeStrongBinder(surface->asBinder());
        data.writeCString(componentName);
        data.writeInt32(colorFormat);
        data.writeInt32(encodedWidth);
        data.writeInt32(encodedHeight);
        data.writeInt32(displayWidth);
        data.writeInt32(displayHeight);

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

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

IMPLEMENT_META_INTERFACE(OMX, "android.hardware.IOMX");

////////////////////////////////////////////////////////////////////////////////

#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 BnOMX::onTransact(
    uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
    switch (code) {
        case LIVES_LOCALLY:
        {
            CHECK_INTERFACE(IOMX, data, reply);
            reply->writeInt32(livesLocally((pid_t)data.readInt32()));

            return OK;
        }

        case LIST_NODES:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            List<ComponentInfo> list;
            listNodes(&list);

            reply->writeInt32(list.size());
            for (List<ComponentInfo>::iterator it = list.begin();
                 it != list.end(); ++it) {
                ComponentInfo &cur = *it;

                reply->writeString8(cur.mName);
                reply->writeInt32(cur.mRoles.size());
                for (List<String8>::iterator role_it = cur.mRoles.begin();
                     role_it != cur.mRoles.end(); ++role_it) {
                    reply->writeString8(*role_it);
                }
            }

            return NO_ERROR;
        }

        case ALLOCATE_NODE:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            const char *name = data.readCString();

            sp<IOMXObserver> observer =
                interface_cast<IOMXObserver>(data.readStrongBinder());

            node_id node;

            status_t err = allocateNode(name, observer, &node);
            reply->writeInt32(err);
            if (err == OK) {
                reply->writeIntPtr((intptr_t)node);
            }

            return NO_ERROR;
        }

        case FREE_NODE:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();

            reply->writeInt32(freeNode(node));

            return NO_ERROR;
        }

        case SEND_COMMAND:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();

            OMX_COMMANDTYPE cmd =
                static_cast<OMX_COMMANDTYPE>(data.readInt32());

            OMX_S32 param = data.readInt32();
            reply->writeInt32(sendCommand(node, cmd, param));

            return NO_ERROR;
        }

        case GET_PARAMETER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_INDEXTYPE index = static_cast<OMX_INDEXTYPE>(data.readInt32());

            size_t size = data.readInt32();

            // XXX I am not happy with this but Parcel::readInplace didn't work.
            void *params = malloc(size);
            data.read(params, size);

            status_t err = getParameter(node, index, params, size);

            reply->writeInt32(err);

            if (err == OK) {
                reply->write(params, size);
            }

            free(params);
            params = NULL;

            return NO_ERROR;
        }

        case SET_PARAMETER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_INDEXTYPE index = static_cast<OMX_INDEXTYPE>(data.readInt32());

            size_t size = data.readInt32();
            void *params = const_cast<void *>(data.readInplace(size));

            reply->writeInt32(setParameter(node, index, params, size));

            return NO_ERROR;
        }

        case GET_CONFIG:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_INDEXTYPE index = static_cast<OMX_INDEXTYPE>(data.readInt32());

            size_t size = data.readInt32();

            // XXX I am not happy with this but Parcel::readInplace didn't work.
            void *params = malloc(size);
            data.read(params, size);

            status_t err = getConfig(node, index, params, size);

            reply->writeInt32(err);

            if (err == OK) {
                reply->write(params, size);
            }

            free(params);
            params = NULL;

            return NO_ERROR;
        }

        case SET_CONFIG:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_INDEXTYPE index = static_cast<OMX_INDEXTYPE>(data.readInt32());

            size_t size = data.readInt32();
            void *params = const_cast<void *>(data.readInplace(size));

            reply->writeInt32(setConfig(node, index, params, size));

            return NO_ERROR;
        }

        case ENABLE_GRAPHIC_BUFFERS:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            OMX_BOOL enable = (OMX_BOOL)data.readInt32();

            status_t err = enableGraphicBuffers(node, port_index, enable);
            reply->writeInt32(err);

            return NO_ERROR;
        }

        case USE_BUFFER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            sp<IMemory> params =
                interface_cast<IMemory>(data.readStrongBinder());

            buffer_id buffer;
            status_t err = useBuffer(node, port_index, params, &buffer);
            reply->writeInt32(err);

            if (err == OK) {
                reply->writeIntPtr((intptr_t)buffer);
            }

            return NO_ERROR;
        }

        case USE_GRAPHIC_BUFFER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            sp<GraphicBuffer> graphicBuffer = new GraphicBuffer();
            data.read(*graphicBuffer);

            buffer_id buffer;
            status_t err = useGraphicBuffer(
                    node, port_index, graphicBuffer, &buffer);
            reply->writeInt32(err);

            if (err == OK) {
                reply->writeIntPtr((intptr_t)buffer);
            }

            return NO_ERROR;
        }

        case STORE_META_DATA_IN_BUFFERS:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            OMX_BOOL enable = (OMX_BOOL)data.readInt32();

            status_t err = storeMetaDataInBuffers(node, port_index, enable);
            reply->writeInt32(err);

            return NO_ERROR;
        }

        case ALLOC_BUFFER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            size_t size = data.readInt32();

            buffer_id buffer;
            void *buffer_data;
            status_t err = allocateBuffer(
                    node, port_index, size, &buffer, &buffer_data);
            reply->writeInt32(err);

            if (err == OK) {
                reply->writeIntPtr((intptr_t)buffer);
                reply->writeIntPtr((intptr_t)buffer_data);
            }

            return NO_ERROR;
        }

        case ALLOC_BUFFER_WITH_BACKUP:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            sp<IMemory> params =
                interface_cast<IMemory>(data.readStrongBinder());

            buffer_id buffer;
            status_t err = allocateBufferWithBackup(
                    node, port_index, params, &buffer);

            reply->writeInt32(err);

            if (err == OK) {
                reply->writeIntPtr((intptr_t)buffer);
            }

            return NO_ERROR;
        }

        case FREE_BUFFER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            OMX_U32 port_index = data.readInt32();
            buffer_id buffer = (void*)data.readIntPtr();
            reply->writeInt32(freeBuffer(node, port_index, buffer));

            return NO_ERROR;
        }

        case FILL_BUFFER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            buffer_id buffer = (void*)data.readIntPtr();
            reply->writeInt32(fillBuffer(node, buffer));

            return NO_ERROR;
        }

        case EMPTY_BUFFER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            buffer_id buffer = (void*)data.readIntPtr();
            OMX_U32 range_offset = data.readInt32();
            OMX_U32 range_length = data.readInt32();
            OMX_U32 flags = data.readInt32();
            OMX_TICKS timestamp = data.readInt64();

            reply->writeInt32(
                    emptyBuffer(
                        node, buffer, range_offset, range_length,
                        flags, timestamp));

            return NO_ERROR;
        }

        case GET_EXTENSION_INDEX:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            node_id node = (void*)data.readIntPtr();
            const char *parameter_name = data.readCString();

            OMX_INDEXTYPE index;
            status_t err = getExtensionIndex(node, parameter_name, &index);

            reply->writeInt32(err);

            if (err == OK) {
                reply->writeInt32(index);
            }

            return OK;
        }

        case CREATE_RENDERER:
        {
            CHECK_INTERFACE(IOMX, data, reply);

            sp<ISurface> isurface =
                interface_cast<ISurface>(data.readStrongBinder());

            const char *componentName = data.readCString();

            OMX_COLOR_FORMATTYPE colorFormat =
                static_cast<OMX_COLOR_FORMATTYPE>(data.readInt32());

            size_t encodedWidth = (size_t)data.readInt32();
            size_t encodedHeight = (size_t)data.readInt32();
            size_t displayWidth = (size_t)data.readInt32();
            size_t displayHeight = (size_t)data.readInt32();

            sp<IOMXRenderer> renderer =
                createRenderer(isurface, componentName, colorFormat,
                               encodedWidth, encodedHeight,
                               displayWidth, displayHeight);

            reply->writeStrongBinder(renderer->asBinder());

            return OK;
        }

        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

////////////////////////////////////////////////////////////////////////////////

class BpOMXObserver : public BpInterface<IOMXObserver> {
public:
    BpOMXObserver(const sp<IBinder> &impl)
        : BpInterface<IOMXObserver>(impl) {
    }

    virtual void onMessage(const omx_message &msg) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMXObserver::getInterfaceDescriptor());
        data.write(&msg, sizeof(msg));

        remote()->transact(OBSERVER_ON_MSG, data, &reply, IBinder::FLAG_ONEWAY);
    }
};

IMPLEMENT_META_INTERFACE(OMXObserver, "android.hardware.IOMXObserver");

status_t BnOMXObserver::onTransact(
    uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
    switch (code) {
        case OBSERVER_ON_MSG:
        {
            CHECK_INTERFACE(IOMXObserver, data, reply);

            omx_message msg;
            data.read(&msg, sizeof(msg));

            // XXX Could use readInplace maybe?
            onMessage(msg);

            return NO_ERROR;
        }

        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

////////////////////////////////////////////////////////////////////////////////

class BpOMXRenderer : public BpInterface<IOMXRenderer> {
public:
    BpOMXRenderer(const sp<IBinder> &impl)
        : BpInterface<IOMXRenderer>(impl) {
    }

    virtual void render(IOMX::buffer_id buffer) {
        Parcel data, reply;
        data.writeInterfaceToken(IOMXRenderer::getInterfaceDescriptor());
        data.writeIntPtr((intptr_t)buffer);

        // NOTE: Do NOT make this a ONE_WAY call, it must be synchronous
        // so that the caller knows when to recycle the buffer.
        remote()->transact(RENDERER_RENDER, data, &reply);
    }
};

IMPLEMENT_META_INTERFACE(OMXRenderer, "android.hardware.IOMXRenderer");

status_t BnOMXRenderer::onTransact(
    uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
    switch (code) {
        case RENDERER_RENDER:
        {
            CHECK_INTERFACE(IOMXRenderer, data, reply);

            IOMX::buffer_id buffer = (void*)data.readIntPtr();

            render(buffer);

            return NO_ERROR;
        }

        default:
            return BBinder::onTransact(code, data, reply, flags);
    }
}

}  // namespace android