int UVCPreview::stopPreview() {
ENTER();
bool b = isRunning();
if (LIKELY(b)) {
mIsRunning = false;
pthread_cond_signal(&preview_sync);
pthread_cond_signal(&capture_sync);
if (pthread_join(capture_thread, NULL) != EXIT_SUCCESS) {
LOGW("UVCPreview::terminate capture thread: pthread_join failed");
}
if (pthread_join(preview_thread, NULL) != EXIT_SUCCESS) {
LOGW("UVCPreview::terminate preview thread: pthread_join failed");
}
clearDisplay();
}
clearPreviewFrame();
clearCaptureFrame();
pthread_mutex_lock(&preview_mutex);
if (mPreviewWindow) {
ANativeWindow_release(mPreviewWindow);
mPreviewWindow = NULL;
}
pthread_mutex_unlock(&preview_mutex);
pthread_mutex_lock(&capture_mutex);
if (mCaptureWindow) {
ANativeWindow_release(mCaptureWindow);
mCaptureWindow = NULL;
}
pthread_mutex_unlock(&capture_mutex);
RETURN(0, int);
}
void UVCPreview::do_preview(uvc_stream_ctrl_t *ctrl) {
ENTER();
uvc_frame_t *frame = NULL;
uvc_error_t result = uvc_start_iso_streaming(
mDeviceHandle, ctrl, uvc_preview_frame_callback, (void *)this);
if (LIKELY(!result)) {
clearPreviewFrame();
pthread_create(&capture_thread, NULL, capture_thread_func, (void *)this);
#if LOCAL_DEBUG
LOGI("Streaming...");
#endif
while (LIKELY(isRunning())) {
frame = waitPreviewFrame();
if (LIKELY(frame)) {
frame = draw_preview_one(frame, &mPreviewWindow, uvc_any2rgbx, 4);
addCaptureFrame(frame);
}
}
pthread_cond_signal(&capture_sync);
#if LOCAL_DEBUG
LOGI("preview_thread_func:wait for all callbacks complete");
#endif
uvc_stop_streaming(mDeviceHandle);
#if LOCAL_DEBUG
LOGI("Streaming finished");
#endif
} else {
uvc_perror(result, "failed start_streaming");
}
EXIT();
}
UVCPreview::~UVCPreview() {
ENTER();
if (mPreviewWindow)
ANativeWindow_release(mPreviewWindow);
mPreviewWindow = NULL;
if (mCaptureWindow)
ANativeWindow_release(mCaptureWindow);
mCaptureWindow = NULL;
clearPreviewFrame();
clearCaptureFrame();
pthread_mutex_destroy(&preview_mutex);
pthread_cond_destroy(&preview_sync);
pthread_mutex_destroy(&capture_mutex);
pthread_cond_destroy(&capture_sync);
EXIT();
}
