void CallbackPipeline::do_capture(JNIEnv *env) {
ENTER();
uvc_frame_t *frame;
uvc_frame_t *temp = get_frame(default_frame_size);
uvc_frame_t *callback_frame;
uint32_t width = 0, height = 0;
size_t sz = default_frame_size;
if (LIKELY(temp)) {
for (; isRunning() && isCapturing();) {
frame = waitCaptureFrame();
if ((LIKELY(frame))) {
if (UNLIKELY((width != frame->width) || (height != frame->height))) {
width = frame->width;
height = frame->height;
callbackPixelFormatChanged(width, height);
uvc_ensure_frame_size(temp, callbackPixelBytes);
sz = callbackPixelBytes;
}
if (mFrameCallbackObj) {
callback_frame = frame;
sz = frame->actual_bytes;
if (mFrameCallbackFunc) {
callback_frame = temp;
sz = callbackPixelBytes;
int b = mFrameCallbackFunc(frame, temp);
if (UNLIKELY(b)) {
LOGW("failed to convert to callback frame");
goto SKIP;
}
}
jobject buf = env->NewDirectByteBuffer(callback_frame->data, callbackPixelBytes);
env->CallVoidMethod(mFrameCallbackObj, iframecallback_fields.onFrame, buf);
env->ExceptionClear();
env->DeleteLocalRef(buf);
}
SKIP:
recycle_frame(frame);
}
}
recycle_frame(temp);
}
EXIT();
}
int UVCPreview::setFrameCallback(JNIEnv *env, jobject frame_callback_obj, int pixel_format) {
ENTER();
pthread_mutex_lock(&capture_mutex);
{
if (isRunning() && isCapturing()) {
mIsCapturing = false;
if (mFrameCallbackObj) {
pthread_cond_signal(&capture_sync);
pthread_cond_wait(&capture_sync, &capture_mutex); // wait finishing capturing
}
}
if (!env->IsSameObject(mFrameCallbackObj, frame_callback_obj)) {
iframecallback_fields.onFrame = NULL;
if (mFrameCallbackObj) {
env->DeleteGlobalRef(mFrameCallbackObj);
}
mFrameCallbackObj = frame_callback_obj;
if (frame_callback_obj) {
// get method IDs of Java object for callback
jclass clazz = env->GetObjectClass(frame_callback_obj);
if (LIKELY(clazz)) {
iframecallback_fields.onFrame = env->GetMethodID(clazz,
"onFrame", "(Ljava/nio/ByteBuffer;)V");
} else {
LOGW("failed to get object class");
}
env->ExceptionClear();
if (!iframecallback_fields.onFrame) {
LOGE("Can't find IFrameCallback#onFrame");
env->DeleteGlobalRef(frame_callback_obj);
mFrameCallbackObj = frame_callback_obj = NULL;
}
}
}
if (frame_callback_obj) {
mPixelFormat = pixel_format;
callbackPixelFormatChanged();
}
}
pthread_mutex_unlock(&capture_mutex);
RETURN(0, int);
}