C++ sp::base方法代码示例

status_t DataConverter::convert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target) {
    CHECK(source->base() != target->base());
    size_t size = targetSize(source->size());
    status_t err = OK;
    if (size > target->capacity()) {
        ALOGE("data size (%zu) is greater than buffer capacity (%zu)",
                size,          // this is the data received/to be converted
                target->capacity()); // this is out buffer size
        err = FAILED_TRANSACTION;
    } else {
        err = safeConvert(source, target);
    }
    target->setRange(0, err == OK ? size : 0);
    return err;
}

/**
 * This Callback is used by HAL to return the pointer to a preview frame.
 *
 * After we have created the Frame struct, we can call the user-defined callback
 **/
void CameraAcc::postPreviewBuffer(sp<IMemoryHeap> heap, uint8_t *heapBase, size_t size, ssize_t offset)
{
    LOG2("@%s, heapBase=%p, size=%d", __FUNCTION__, heapBase, size);

    int frameCounter = mFrameMetadata->frameCounter;

    if (mCallback != NULL)
    {
        // Create Frame struct
        Frame f;
        f.img_data = heap->base();
        f.id = mFrameMetadata->id;
        f.frameCounter = mFrameMetadata->frameCounter;
        f.width = mFrameMetadata->width;
        f.height = mFrameMetadata->height;
        f.format = mFrameMetadata->format;
        f.stride = mFrameMetadata->stride;
        f.size = mFrameMetadata->size;

        // Call callback function
        mCallback(&f);
    }

    // Return buffer
    status_t status = mCamera->sendCommand(CAMERA_CMD_ACC_RETURN_BUFFER, frameCounter, 0);

    if (status != NO_ERROR)
        ALOGE("Could not return buffer");
}

int CodeCache::cache(  const AssemblyKeyBase& keyBase,
                            const sp<Assembly>& assembly)
{
    pthread_mutex_lock(&mLock);

    const ssize_t assemblySize = assembly->size();
    while (mCacheInUse + assemblySize > mCacheSize) {
        // evict the LRU
        size_t lru = 0;
        size_t count = mCacheData.size();
        for (size_t i=0 ; i<count ; i++) {
            const cache_entry_t& e = mCacheData.valueAt(i);
            if (e.when < mCacheData.valueAt(lru).when) {
                lru = i;
            }
        }
        const cache_entry_t& e = mCacheData.valueAt(lru);
        mCacheInUse -= e.entry->size();
        mCacheData.removeItemsAt(lru);
    }

    ssize_t err = mCacheData.add(key_t(keyBase), cache_entry_t(assembly, mWhen));
    if (err >= 0) {
        mCacheInUse += assemblySize;
        mWhen++;
        // synchronize caches...
        char* base = reinterpret_cast<char*>(assembly->base());
        char* curr = reinterpret_cast<char*>(base + assembly->size());
        __builtin___clear_cache(base, curr);
    }

    pthread_mutex_unlock(&mLock);
    return err;
}

SimpleMemory::SimpleMemory(const sp<IMemoryHeap>& heap,
        ssize_t offset, size_t size)
    : MemoryBase(heap, offset, size)
{
#ifndef NDEBUG
    void* const start_ptr = (void*)(intptr_t(heap->base()) + offset);
    memset(start_ptr, 0xda, size);
#endif
}

Allocation::Allocation(
        const sp<MemoryDealer>& dealer,
        const sp<IMemoryHeap>& heap, ssize_t offset, size_t size)
    : MemoryBase(heap, offset, size), mDealer(dealer)
{
#ifndef NDEBUG
    void* const start_ptr = (void*)(intptr_t(heap->base()) + offset);
    memset(start_ptr, 0xda, size);
#endif
}

void CameraClient::copyFrameAndPostCopiedFrame(
        int32_t msgType, const sp<ICameraClient>& client,
        const sp<IMemoryHeap>& heap, size_t offset, size_t size,
        camera_frame_metadata_t *metadata) {
    LOG2("copyFrameAndPostCopiedFrame");
    // It is necessary to copy out of pmem before sending this to
    // the callback. For efficiency, reuse the same MemoryHeapBase
    // provided it's big enough. Don't allocate the memory or
    // perform the copy if there's no callback.
    // hold the preview lock while we grab a reference to the preview buffer
    sp<MemoryHeapBase> previewBuffer;

    if (mPreviewBuffer == 0) {
        mPreviewBuffer = new MemoryHeapBase(size, 0, NULL);
    } else if (size > mPreviewBuffer->virtualSize()) {
        mPreviewBuffer.clear();
        mPreviewBuffer = new MemoryHeapBase(size, 0, NULL);
    }
    if (mPreviewBuffer == 0) {
        ALOGE("failed to allocate space for preview buffer");
        mLock.unlock();
        return;
    }
    previewBuffer = mPreviewBuffer;

    void* previewBufferBase = previewBuffer->base();
    void* heapBase = heap->base();

    if (heapBase == MAP_FAILED) {
        ALOGE("%s: Failed to mmap heap for preview frame.", __FUNCTION__);
        mLock.unlock();
        return;
    } else if (previewBufferBase == MAP_FAILED) {
        ALOGE("%s: Failed to mmap preview buffer for preview frame.", __FUNCTION__);
        mLock.unlock();
        return;
    }

    memcpy(previewBufferBase, (uint8_t *) heapBase + offset, size);

    sp<MemoryBase> frame = new MemoryBase(previewBuffer, 0, size);
    if (frame == 0) {
        ALOGE("failed to allocate space for frame callback");
        mLock.unlock();
        return;
    }

    mLock.unlock();
    client->dataCallback(msgType, frame, metadata);
}

void SimplePlayer::renderAudio(
        CodecState *state, BufferInfo *info, const sp<ABuffer> &buffer) {
    CHECK(state->mAudioTrack != NULL);

    if (state->mAudioTrack->stopped()) {
        state->mAudioTrack->start();
    }

    uint32_t numFramesPlayed;
    CHECK_EQ(state->mAudioTrack->getPosition(&numFramesPlayed), (status_t)OK);

    uint32_t numFramesAvailableToWrite =
        state->mAudioTrack->frameCount()
            - (state->mNumFramesWritten - numFramesPlayed);

    size_t numBytesAvailableToWrite =
        numFramesAvailableToWrite * state->mAudioTrack->frameSize();

    size_t copy = info->mSize;
    if (copy > numBytesAvailableToWrite) {
        copy = numBytesAvailableToWrite;
    }

    if (copy == 0) {
        return;
    }

    int64_t startTimeUs = ALooper::GetNowUs();

    ssize_t nbytes = state->mAudioTrack->write(
            buffer->base() + info->mOffset, copy);

    CHECK_EQ(nbytes, (ssize_t)copy);

    int64_t delayUs = ALooper::GetNowUs() - startTimeUs;

    uint32_t numFramesWritten = nbytes / state->mAudioTrack->frameSize();

    if (delayUs > 2000ll) {
        ALOGW("AudioTrack::write took %lld us, numFramesAvailableToWrite=%u, "
              "numFramesWritten=%u",
              delayUs, numFramesAvailableToWrite, numFramesWritten);
    }

    info->mOffset += nbytes;
    info->mSize -= nbytes;

    state->mNumFramesWritten += numFramesWritten;
}

int CodeCache::cache(  const AssemblyKeyBase& keyBase,
                       const sp<Assembly>& assembly)
{
    pthread_mutex_lock(&mLock);

    const ssize_t assemblySize = assembly->size();
    while (mCacheInUse + assemblySize > mCacheSize) {
        // evict the LRU
        size_t lru = 0;
        size_t count = mCacheData.size();
        for (size_t i=0 ; i<count ; i++) {
            const cache_entry_t& e = mCacheData.valueAt(i);
            if (e.when < mCacheData.valueAt(lru).when) {
                lru = i;
            }
        }
        const cache_entry_t& e = mCacheData.valueAt(lru);
        mCacheInUse -= e.entry->size();
        mCacheData.removeItemsAt(lru);
    }

    ssize_t err = mCacheData.add(key_t(keyBase), cache_entry_t(assembly, mWhen));
    if (err >= 0) {
        mCacheInUse += assemblySize;
        mWhen++;
        // synchronize caches...
#if defined(__arm__)
        const long base = long(assembly->base());
        const long curr = base + long(assembly->size());
        err = cacheflush(base, curr, 0);
        LOGE_IF(err, "__ARM_NR_cacheflush error %s\n",
                strerror(errno));
#endif
    }

    pthread_mutex_unlock(&mLock);
    return err;
}

status_t AudioConverter::safeConvert(const sp<MediaCodecBuffer> &src, sp<MediaCodecBuffer> &tgt) {
    if (mTo == kAudioEncodingPcm8bit && mFrom == kAudioEncodingPcm16bit) {
        memcpy_to_u8_from_i16((uint8_t*)tgt->base(), (const int16_t*)src->data(), src->size() / 2);
    } else if (mTo == kAudioEncodingPcm8bit && mFrom == kAudioEncodingPcmFloat) {
        memcpy_to_u8_from_float((uint8_t*)tgt->base(), (const float*)src->data(), src->size() / 4);
    } else if (mTo == kAudioEncodingPcm16bit && mFrom == kAudioEncodingPcm8bit) {
        memcpy_to_i16_from_u8((int16_t*)tgt->base(), (const uint8_t*)src->data(), src->size());
    } else if (mTo == kAudioEncodingPcm16bit && mFrom == kAudioEncodingPcmFloat) {
        memcpy_to_i16_from_float((int16_t*)tgt->base(), (const float*)src->data(), src->size() / 4);
    } else if (mTo == kAudioEncodingPcmFloat && mFrom == kAudioEncodingPcm8bit) {
        memcpy_to_float_from_u8((float*)tgt->base(), (const uint8_t*)src->data(), src->size());
    } else if (mTo == kAudioEncodingPcmFloat && mFrom == kAudioEncodingPcm16bit) {
        memcpy_to_float_from_i16((float*)tgt->base(), (const int16_t*)src->data(), src->size() / 2);
    } else {
        return INVALID_OPERATION;
    }
    return OK;
}

		void CameraService::Client::copyFrameAndPostCopiedFrame(
																const sp<ICameraClient>& client, const sp<IMemoryHeap>& heap,
																size_t offset, size_t size) {
			LOG2("copyFrameAndPostCopiedFrame");
			// It is necessary to copy out of pmem before sending this to
			// the callback. For efficiency, reuse the same MemoryHeapBase
			// provided it's big enough. Don't allocate the memory or
			// perform the copy if there's no callback.
			// hold the preview lock while we grab a reference to the preview buffer
			sp<MemoryHeapBase> previewBuffer;
			
			if (mPreviewBuffer == 0) {
				mPreviewBuffer = new MemoryHeapBase(size, 0, NULL);
			} else if (size > mPreviewBuffer->virtualSize()) {
				mPreviewBuffer.clear();
				mPreviewBuffer = new MemoryHeapBase(size, 0, NULL);
			}
			if (mPreviewBuffer == 0) {
				LOGE("failed to allocate space for preview buffer");
				mLock.unlock();
				return;
			}
			previewBuffer = mPreviewBuffer;
			
			memcpy(previewBuffer->base(), (uint8_t *)heap->base() + offset, size);
			
			sp<MemoryBase> frame = new MemoryBase(previewBuffer, 0, size);
			if (frame == 0) {
				LOGE("failed to allocate space for frame callback");
				mLock.unlock();
				return;
			}
			
			mLock.unlock();
			client->dataCallback(CAMERA_MSG_PREVIEW_FRAME, frame);
		}