20 local_reader(reader), path(path), chunk_size(24*3), chunk_count(1), frame_count(1), is_writing(false),
21 default_extension(
".webm"), default_vcodec(
"libvpx"), default_acodec(
"libvorbis"), last_frame_needed(false), is_open(false)
34 write_json_meta_data();
41 std::string ChunkWriter::get_chunk_path(int64_t chunk_number, std::string folder, std::string extension)
44 std::stringstream chunk_count_string;
45 chunk_count_string << chunk_number;
46 QString padded_count =
"%1";
47 padded_count = padded_count.arg(chunk_count_string.str().c_str(), 6,
'0');
48 if (folder.length() != 0 && extension.length() != 0)
50 return QDir::cleanPath(QString(path.c_str()) + QDir::separator() + folder.c_str() + QDir::separator() + padded_count + extension.c_str()).toStdString();
52 else if (folder.length() == 0 && extension.length() != 0)
54 return QDir::cleanPath(QString(path.c_str()) + QDir::separator() + padded_count + extension.c_str()).toStdString();
56 else if (folder.length() != 0 && extension.length() == 0)
58 return QDir::cleanPath(QString(path.c_str()) + QDir::separator() + folder.c_str()).toStdString();
68 throw WriterClosed(
"The ChunkWriter is closed. Call Open() before calling this method.", path);
74 frame->Save(get_chunk_path(chunk_count,
"",
".jpeg"), 1.0);
77 create_folder(get_chunk_path(chunk_count,
"final",
""));
78 writer_final =
new FFmpegWriter(get_chunk_path(chunk_count,
"final", default_extension));
83 create_folder(get_chunk_path(chunk_count,
"preview",
""));
84 writer_preview =
new FFmpegWriter(get_chunk_path(chunk_count,
"preview", default_extension));
89 create_folder(get_chunk_path(chunk_count,
"thumb",
""));
90 writer_thumb =
new FFmpegWriter(get_chunk_path(chunk_count,
"thumb", default_extension));
106 last_frame_needed =
true;
111 if (last_frame_needed)
121 auto blank_frame = std::make_shared<Frame>(
131 last_frame_needed =
false;
144 if (frame_count % chunk_size == 0 && frame_count >= chunk_size)
147 for (
int z = 0; z<12; z++)
161 writer_final->
Close();
162 writer_preview->
Close();
163 writer_thumb->
Close();
184 for (int64_t number = start; number <= length; number++)
187 std::shared_ptr<Frame> f = reader->
GetFrame(number);
198 for (int64_t number = start; number <= length; number++)
201 std::shared_ptr<Frame> f = local_reader->
GetFrame(number);
215 for (
int z = 0; z<12; z++)
229 writer_final->
Close();
230 writer_preview->
Close();
231 writer_thumb->
Close();
248 local_reader->
Close();
252 void ChunkWriter::write_json_meta_data()
255 std::string json_path = QDir::cleanPath(QString(path.c_str()) + QDir::separator() +
"info.json").toStdString();
258 std::ofstream myfile;
259 myfile.open (json_path.c_str());
260 myfile << local_reader->
Json() << std::endl;
265 void ChunkWriter::create_folder(std::string path)
267 QDir dir(path.c_str());
274 bool ChunkWriter::is_chunk_valid()
int channels
The number of audio channels used in the audio stream.
WriterInfo info
Information about the current media file.
int video_bit_rate
The bit rate of the video stream (in bytes)
Header file for ChunkWriter class.
ChunkWriter(std::string path, openshot::ReaderBase *reader)
Constructor for ChunkWriter. Throws one of the following exceptions.
This class uses the FFmpeg libraries, to write and encode video files and audio files.
void WriteFrame(std::shared_ptr< openshot::Frame > frame)
Add a frame to the stack waiting to be encoded.
virtual void Close()=0
Close the reader (and any resources it was consuming)
This abstract class is the base class, used by all readers in libopenshot.
int width
The width of the video (in pixels)
std::string acodec
The name of the audio codec used to encode / decode the video stream.
openshot::ChannelLayout channel_layout
The channel layout (mono, stereo, 5 point surround, etc...)
openshot::Fraction pixel_ratio
The pixel ratio of the video stream as a fraction (i.e. some pixels are not square) ...
void WriteFrame(std::shared_ptr< openshot::Frame > frame)
Add a frame to the stack waiting to be encoded.
virtual std::shared_ptr< openshot::Frame > GetFrame(int64_t number)=0
Header file for all Exception classes.
void SetVideoOptions(bool has_video, std::string codec, openshot::Fraction fps, int width, int height, openshot::Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate)
Set video export options.
Header file for Frame class.
void SetAudioOptions(bool has_audio, std::string codec, int sample_rate, int channels, openshot::ChannelLayout channel_layout, int bit_rate)
Set audio export options.
virtual std::string Json() const =0
Generate JSON string of this object.
void WriteTrailer()
Write the file trailer (after all frames are written). This is called automatically by the Close() me...
void WriteHeader()
Write the file header (after the options are set). This method is called automatically by the Open() ...
void Close()
Close the writer.
int sample_rate
The number of audio samples per second (44100 is a common sample rate)
This namespace is the default namespace for all code in the openshot library.
std::string vcodec
The name of the video codec used to encode / decode the video stream.
Exception when too many seek attempts happen.
void PrepareStreams()
Prepare & initialize streams and open codecs. This method is called automatically by the Open() metho...
int height
The height of the video (in pixels)
void CopyReaderInfo(openshot::ReaderBase *reader)
This method copy's the info struct of a reader, and sets the writer with the same info...
openshot::Fraction fps
Frames per second, as a fraction (i.e. 24/1 = 24 fps)
void Close()
Close the writer.
virtual void Open()=0
Open the reader (and start consuming resources, such as images or video files)