24 :
path(
path), chunk_size(24 * 3), is_open(false), version(chunk_version), local_reader(NULL)
27 if (!does_folder_exist(
path))
32 previous_location.
number = 0;
33 previous_location.
frame = 0;
41bool ChunkReader::does_folder_exist(std::string
path)
43 QDir dir(
path.c_str());
48void ChunkReader::load_json()
51 std::string json_path = QDir::cleanPath(QString(
path.c_str()) + QDir::separator() +
"info.json").toStdString();
52 std::stringstream json_string;
55 std::ifstream myfile (json_path.c_str());
56 std::string line =
"";
61 getline (myfile, line);
69 Json::CharReaderBuilder rbuilder;
72 bool success = Json::parseFromStream(rbuilder, json_string, &root, &errors);
75 throw InvalidJSON(
"Chunk folder could not be opened.", path);
111 catch (
const std::exception& e)
114 throw InvalidJSON(
"JSON could not be parsed (or is invalid).", path);
119ChunkLocation ChunkReader::find_chunk_frame(int64_t requested_frame)
122 int64_t chunk_number = (requested_frame / chunk_size) + 1;
125 int64_t start_frame_of_chunk = (chunk_number - 1) * chunk_size;
126 int64_t chunk_frame_number = (requested_frame - start_frame_of_chunk) + 1;
160std::string ChunkReader::get_chunk_path(int64_t chunk_number, std::string folder, std::string extension)
163 std::stringstream chunk_count_string;
164 chunk_count_string << chunk_number;
165 QString padded_count =
"%1";
166 padded_count = padded_count.arg(chunk_count_string.str().c_str(), 6,
'0');
167 if (folder.length() != 0 && extension.length() != 0)
169 return QDir::cleanPath(QString(
path.c_str()) + QDir::separator() + folder.c_str() + QDir::separator() + padded_count + extension.c_str()).toStdString();
171 else if (folder.length() == 0 && extension.length() != 0)
173 return QDir::cleanPath(QString(
path.c_str()) + QDir::separator() + padded_count + extension.c_str()).toStdString();
175 else if (folder.length() != 0 && extension.length() == 0)
177 return QDir::cleanPath(QString(
path.c_str()) + QDir::separator() + folder.c_str()).toStdString();
192 std::string folder_name =
"";
196 folder_name =
"thumb";
199 folder_name =
"preview";
202 folder_name =
"final";
207 std::string chunk_video_path = get_chunk_path(location.
number, folder_name,
".webm");
213 local_reader->
Close();
221 local_reader->
Open();
230 previous_location = location;
237 last_frame->number = requested_frame;
255 root[
"type"] =
"ChunkReader";
257 std::stringstream chunk_size_stream;
258 chunk_size_stream << chunk_size;
259 root[
"chunk_size"] = chunk_size_stream.str();
260 root[
"chunk_version"] = version;
275 catch (
const std::exception& e)
278 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)");
289 if (!root[
"path"].isNull())
290 path = root[
"path"].asString();
291 if (!root[
"chunk_size"].isNull())
292 chunk_size = std::stoll(root[
"chunk_size"].asString());
293 if (!root[
"chunk_version"].isNull())
Header file for ChunkReader class.
Header file for all Exception classes.
Header file for FFmpegReader class.
Exception when a required chunk is missing.
std::string Json() const override
Generate JSON string of this object.
void Close() override
Close the reader.
void Open() override
Open the reader. This is required before you can access frames or data from the reader.
Json::Value JsonValue() const override
Generate Json::Value for this object.
ChunkReader(std::string path, ChunkVersion chunk_version)
Constructor for ChunkReader. This automatically opens the chunk file or folder and loads frame 1,...
std::shared_ptr< openshot::Frame > GetFrame(int64_t requested_frame) override
Get an openshot::Frame object for a specific frame number of this reader.
void SetJsonValue(const Json::Value root) override
Load Json::Value into this object.
void SetJson(const std::string value) override
Load JSON string into this object.
This class uses the FFmpeg libraries, to open video files and audio files, and return openshot::Frame...
int num
Numerator for the 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.
virtual void Open()=0
Open the reader (and start consuming resources, such as images or video files)
virtual std::shared_ptr< openshot::Frame > GetFrame(int64_t number)=0
virtual void Close()=0
Close the reader (and any resources it was consuming)
This namespace is the default namespace for all code in the openshot library.
ChunkVersion
This enumeration allows the user to choose which version of the chunk they would like (low,...
@ THUMBNAIL
The lowest quality stream contained in this chunk file.
@ FINAL
The highest quality stream contained in this chunk file.
@ PREVIEW
The medium quality stream contained in this chunk file.
const Json::Value stringToJson(const std::string value)
This struct holds the location of a frame within a chunk.
int64_t number
The chunk number.
int64_t frame
The frame number.
int audio_bit_rate
The bit rate of the audio stream (in bytes)
int video_bit_rate
The bit rate of the video stream (in bytes)
float duration
Length of time (in seconds)
openshot::Fraction audio_timebase
The audio timebase determines how long each audio packet should be played.
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)
int pixel_format
The pixel format (i.e. YUV420P, RGB24, etc...)
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 video_stream_index
The index of the video stream.
int sample_rate
The number of audio samples per second (44100 is a common sample rate)
int audio_stream_index
The index of the audio stream.
int64_t file_size
Size of file (in bytes)