20void DummyReader::init(
Fraction fps,
int width,
int height,
int sample_rate,
int channels,
float duration) {
24 info.
file_size =
static_cast<size_t>(width) * height *
sizeof(
int);
53 init(
Fraction(24,1), 1280, 768, 44100, 2, 30.0);
58 dummy_cache(NULL), last_cached_frame(NULL), image_frame(NULL), is_open(false) {
61 init(fps, width, height, sample_rate, channels, duration);
66 CacheBase* cache) : last_cached_frame(NULL), image_frame(NULL), is_open(false) {
69 init(fps, width, height, sample_rate, channels, duration);
109 throw ReaderClosed(
"The ImageReader is closed. Call Open() before calling this method.",
"dummy");
111 int dummy_cache_count = 0;
113 dummy_cache_count = dummy_cache->
Count();
116 if (dummy_cache_count == 0 && image_frame) {
118 const std::lock_guard<std::recursive_mutex> lock(
getFrameMutex);
121 image_frame->number = requested_frame;
122 last_cached_frame = image_frame;
125 }
else if (dummy_cache_count > 0) {
127 const std::lock_guard<std::recursive_mutex> lock(
getFrameMutex);
130 std::shared_ptr<openshot::Frame> f = dummy_cache->
GetFrame(requested_frame);
133 last_cached_frame = f;
135 }
else if (last_cached_frame) {
137 return last_cached_frame;
140 throw InvalidFile(
"Requested frame not found. You can only access Frame numbers that exist in the Cache object.",
"dummy");
145 throw InvalidFile(
"No frame could be created from this type of file.",
"dummy");
160 root[
"type"] =
"DummyReader";
176 catch (
const std::exception& e)
179 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)");
Header file for DummyReader class.
Header file for all Exception classes.
Header file for Frame class.
All cache managers in libopenshot are based on this CacheBase class.
virtual std::shared_ptr< openshot::Frame > GetFrame(int64_t frame_number)=0
Get a frame from the cache.
virtual int64_t Count()=0
Count the frames in the queue.
DummyReader()
Blank constructor for DummyReader, with default settings.
std::shared_ptr< openshot::Frame > GetFrame(int64_t requested_frame) override
void SetJson(const std::string value) override
Load JSON string into this object.
Json::Value JsonValue() const override
Generate Json::Value for this object.
std::string Json() const override
Generate JSON string of this object.
void Open() override
Open File - which is called by the constructor automatically.
void Close() override
Close File.
void SetJsonValue(const Json::Value root) override
Load Json::Value into this object.
This class represents a fraction.
int num
Numerator for the fraction.
float ToFloat()
Return this fraction as a float (i.e. 1/2 = 0.5)
Fraction Reciprocal() const
Return the reciprocal as a Fraction.
int den
Denominator for the fraction.
Exception for files that can not be found or opened.
Exception for invalid JSON.
openshot::ReaderInfo info
Information about the current media file.
virtual void SetJsonValue(const Json::Value root)=0
Load Json::Value into this object.
virtual Json::Value JsonValue() const =0
Generate Json::Value for this object.
std::recursive_mutex getFrameMutex
Mutex for multiple threads.
Exception when a reader is closed, and a frame is requested.
This namespace is the default namespace for all code in the openshot library.
const Json::Value stringToJson(const std::string value)
float duration
Length of time (in seconds)
int width
The width of the video (in pixesl)
int channels
The number of audio channels used in the audio stream.
openshot::Fraction fps
Frames per second, as a fraction (i.e. 24/1 = 24 fps)
openshot::Fraction display_ratio
The ratio of width to height of the video stream (i.e. 640x480 has a ratio of 4/3)
int height
The height of the video (in pixels)
int64_t video_length
The number of frames in the video stream.
std::string acodec
The name of the audio codec used to encode / decode the video stream.
std::string vcodec
The name of the video codec used to encode / decode the video stream.
openshot::Fraction pixel_ratio
The pixel ratio of the video stream as a fraction (i.e. some pixels are not square)
bool has_video
Determines if this file has a video stream.
bool has_audio
Determines if this file has an audio stream.
openshot::Fraction video_timebase
The video timebase determines how long each frame stays on the screen.
int sample_rate
The number of audio samples per second (44100 is a common sample rate)
int64_t file_size
Size of file (in bytes)