status_t MediaBufferGroup::acquire_buffer(
        MediaBuffer **out, bool nonBlocking) {
    Mutex::Autolock autoLock(mLock);

    for (;;) {
        for (MediaBuffer *buffer = mFirstBuffer;
             buffer != NULL; buffer = buffer->nextBuffer()) {
            if (buffer->refcount() == 0) {
                buffer->add_ref();
                buffer->reset();

                *out = buffer;
                goto exit;
            }
        }

        if (nonBlocking) {
            *out = NULL;
            return WOULD_BLOCK;
        }

        // All buffers are in use. Block until one of them is returned to us.
        mCondition.wait(mLock);
    }

exit:
    return OK;
}
MediaBufferPool::~MediaBufferPool() {
    MediaBuffer *next;
    for (MediaBuffer *buffer = mFirstBuffer; buffer != NULL;
            buffer = next) {
        next = buffer->nextBuffer();

        CHECK_EQ(buffer->refcount(), 0);

        buffer->setObserver(NULL);
        buffer->release();
    }
}
Пример #3
0
void OmxDecoder::ReleaseAllPendingVideoBuffersLocked()
{
  Vector<BufferItem> releasingVideoBuffers;
  {
    Mutex::Autolock autoLock(mPendingVideoBuffersLock);

    int size = mPendingVideoBuffers.size();
    for (int i = 0; i < size; i++) {
      releasingVideoBuffers.push(mPendingVideoBuffers[i]);
    }
    mPendingVideoBuffers.clear();
  }
  // Free all pending video buffers without holding mPendingVideoBuffersLock.
  int size = releasingVideoBuffers.size();
  for (int i = 0; i < size; i++) {
    MediaBuffer *buffer;
    buffer = releasingVideoBuffers[i].mMediaBuffer;
#if defined(MOZ_WIDGET_GONK) && ANDROID_VERSION >= 17
    android::sp<Fence> fence;
    int fenceFd = -1;
    fence = releasingVideoBuffers[i].mReleaseFenceHandle.mFence;
    if (fence.get() && fence->isValid()) {
      fenceFd = fence->dup();
    }
    MOZ_ASSERT(buffer->refcount() == 1);
    // This code expect MediaBuffer's ref count is 1.
    // Return gralloc buffer to ANativeWindow
    ANativeWindow* window = static_cast<ANativeWindow*>(mNativeWindowClient.get());
    window->cancelBuffer(window,
                         buffer->graphicBuffer().get(),
                         fenceFd);
    // Mark MediaBuffer as rendered.
    // When gralloc buffer is directly returned to ANativeWindow,
    // this mark is necesary.
    sp<MetaData> metaData = buffer->meta_data();
    metaData->setInt32(kKeyRendered, 1);
#endif
    // Return MediaBuffer to OMXCodec.
    buffer->release();
  }
  releasingVideoBuffers.clear();
}