本文整理汇总了C++中MediaMetadataRetriever::getFrameAtTime方法的典型用法代码示例。如果您正苦于以下问题：C++ MediaMetadataRetriever::getFrameAtTime方法的具体用法？C++ MediaMetadataRetriever::getFrameAtTime怎么用？C++ MediaMetadataRetriever::getFrameAtTime使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MediaMetadataRetriever的用法示例。
在下文中一共展示了MediaMetadataRetriever::getFrameAtTime方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: wseemann_media_FFmpegMediaMetadataRetriever_getFrameAtTime
static jbyteArray wseemann_media_FFmpegMediaMetadataRetriever_getFrameAtTime(JNIEnv *env, jobject thiz, jlong timeUs, jint option)
{
//__android_log_write(ANDROID_LOG_INFO, LOG_TAG, "getFrameAtTime");
MediaMetadataRetriever* retriever = getRetriever(env, thiz);
if (retriever == 0) {
jniThrowException(env, "java/lang/IllegalStateException", "No retriever available");
return NULL;
}
AVPacket packet;
av_init_packet(&packet);
jbyteArray array = NULL;
if (retriever->getFrameAtTime(timeUs, option, &packet) == 0) {
int size = packet.size;
uint8_t* data = packet.data;
array = env->NewByteArray(size);
if (!array) { // OutOfMemoryError exception has already been thrown.
__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, "getFrameAtTime: OutOfMemoryError is thrown.");
} else {
//__android_log_print(ANDROID_LOG_INFO, LOG_TAG, "getFrameAtTime: Got frame.");
jbyte* bytes = env->GetByteArrayElements(array, NULL);
if (bytes != NULL) {
memcpy(bytes, data, size);
env->ReleaseByteArrayElements(array, bytes, 0);
}
}
}
av_free_packet(&packet);
return array;
}开发者ID:Leetyle，项目名称:FFmpegMediaMetadataRetriever，代码行数:33，代码来源:wseemann_media_MediaMetadataRetriever.cpp
示例2: android_media_MediaMetadataRetriever_getFrameAtTime
static jobject android_media_MediaMetadataRetriever_getFrameAtTime(JNIEnv *env, jobject thiz, jlong timeUs, jint option)
{
ALOGV("getFrameAtTime: %lld us option: %d", timeUs, option);
MediaMetadataRetriever* retriever = getRetriever(env, thiz);
if (retriever == 0) {
jniThrowException(env, "java/lang/IllegalStateException", "No retriever available");
return NULL;
}
// Call native method to retrieve a video frame
VideoFrame *videoFrame = NULL;
sp<IMemory> frameMemory = retriever->getFrameAtTime(timeUs, option);
if (frameMemory != 0) { // cast the shared structure to a VideoFrame object
videoFrame = static_cast<VideoFrame *>(frameMemory->pointer());
}
if (videoFrame == NULL) {
ALOGE("getFrameAtTime: videoFrame is a NULL pointer");
return NULL;
}
ALOGV("Dimension = %dx%d and bytes = %d",
videoFrame->mDisplayWidth,
videoFrame->mDisplayHeight,
videoFrame->mSize);
jobject config = env->CallStaticObjectMethod(
fields.configClazz,
fields.createConfigMethod,
SkBitmap::kRGB_565_Config);
size_t width, height;
bool swapWidthAndHeight = false;
if (videoFrame->mRotationAngle == 90 || videoFrame->mRotationAngle == 270) {
width = videoFrame->mHeight;
height = videoFrame->mWidth;
swapWidthAndHeight = true;
} else {
width = videoFrame->mWidth;
height = videoFrame->mHeight;
}
jobject jBitmap = env->CallStaticObjectMethod(
fields.bitmapClazz,
fields.createBitmapMethod,
width,
height,
config);
SkBitmap *bitmap =
(SkBitmap *) env->GetIntField(jBitmap, fields.nativeBitmap);
bitmap->lockPixels();
rotate((uint16_t*)bitmap->getPixels(),
(uint16_t*)((char*)videoFrame + sizeof(VideoFrame)),
videoFrame->mWidth,
videoFrame->mHeight,
videoFrame->mRotationAngle);
bitmap->unlockPixels();
if (videoFrame->mDisplayWidth != videoFrame->mWidth ||
videoFrame->mDisplayHeight != videoFrame->mHeight) {
size_t displayWidth = videoFrame->mDisplayWidth;
size_t displayHeight = videoFrame->mDisplayHeight;
if (swapWidthAndHeight) {
displayWidth = videoFrame->mDisplayHeight;
displayHeight = videoFrame->mDisplayWidth;
}
ALOGV("Bitmap dimension is scaled from %dx%d to %dx%d",
width, height, displayWidth, displayHeight);
jobject scaledBitmap = env->CallStaticObjectMethod(fields.bitmapClazz,
fields.createScaledBitmapMethod,
jBitmap,
displayWidth,
displayHeight,
true);
return scaledBitmap;
}
return jBitmap;
}