22 echo_time(echo_time), feedback(feedback), mix(mix)
25 init_effect_details();
29void Echo::init_effect_details()
37 info.
description =
"Reflection of sound with a delay after the direct sound.";
47 const float max_echo_time = 5;
63std::shared_ptr<openshot::Frame>
Echo::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number)
65 const float echo_time_value = (float)
echo_time.
GetValue(frame_number)*(float)frame->SampleRate();
68 int local_write_position;
72 for (
int channel = 0; channel < frame->audio->getNumChannels(); channel++)
74 float *channel_data = frame->audio->getWritePointer(channel);
75 float *echo_data =
echo_buffer.getWritePointer(channel);
78 for (
auto sample = 0; sample < frame->audio->getNumSamples(); ++sample)
80 const float in = (float)(channel_data[sample]);
84 int local_read_position = floorf(read_position);
86 if (local_read_position != local_write_position)
88 float fraction = read_position - (float)local_read_position;
89 float echoed1 = echo_data[(local_read_position + 0)];
91 out = (float)(echoed1 + fraction * (echoed2 - echoed1));
92 channel_data[sample] = in + mix_value*(out - in);
93 echo_data[local_write_position] = in + out*feedback_value;
138 catch (
const std::exception& e)
141 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)");
152 if (!root[
"echo_time"].isNull())
154 if (!root[
"feedback"].isNull())
156 if (!root[
"mix"].isNull())
165 root[
"id"] =
add_property_json(
"ID", 0.0,
"string",
Id(), NULL, -1, -1,
true, requested_frame);
167 root[
"start"] =
add_property_json(
"Start",
Start(),
"float",
"", NULL, 0, 1000 * 60 * 30,
false, requested_frame);
168 root[
"end"] =
add_property_json(
"End",
End(),
"float",
"", NULL, 0, 1000 * 60 * 30,
false, requested_frame);
169 root[
"duration"] =
add_property_json(
"Duration",
Duration(),
"float",
"", NULL, 0, 1000 * 60 * 30,
true, requested_frame);
177 return root.toStyledString();
Header file for Echo audio effect class.
Header file for all Exception classes.
Header file for Frame class.
float Start() const
Get start position (in seconds) of clip (trim start of video)
float Duration() const
Get the length of this clip (in seconds)
virtual float End() const
Get end position (in seconds) of clip (trim end of video)
std::string Id() const
Get the Id of this clip object.
int Layer() const
Get layer of clip on timeline (lower number is covered by higher numbers)
Json::Value add_property_json(std::string name, float value, std::string type, std::string memo, const Keyframe *keyframe, float min_value, float max_value, bool readonly, int64_t requested_frame) const
Generate JSON for a property.
This class adds a echo into the audio.
void SetJson(const std::string value) override
Load JSON string into this object.
std::string Json() const override
Generate JSON string of this object.
void SetJsonValue(const Json::Value root) override
Load Json::Value into this object.
juce::AudioBuffer< float > echo_buffer
std::shared_ptr< openshot::Frame > GetFrame(int64_t frame_number) override
This method is required for all derived classes of ClipBase, and returns a new openshot::Frame object...
Json::Value JsonValue() const override
Generate Json::Value for this object.
Echo()
Default constructor.
std::string PropertiesJSON(int64_t requested_frame) const override
void setup(std::shared_ptr< openshot::Frame > frame)
virtual Json::Value JsonValue() const
Generate Json::Value for this object.
virtual void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
EffectInfoStruct info
Information about the current effect.
Exception for invalid JSON.
A Keyframe is a collection of Point instances, which is used to vary a number or property over time.
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
double GetValue(int64_t index) const
Get the value at a specific index.
Json::Value JsonValue() const
Generate Json::Value for this object.
This namespace is the default namespace for all code in the openshot library.
const Json::Value stringToJson(const std::string value)
bool has_video
Determines if this effect manipulates the image of a frame.
bool has_audio
Determines if this effect manipulates the audio of a frame.
std::string class_name
The class name of the effect.
std::string name
The name of the effect.
std::string description
The description of this effect and what it does.