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Add backward looping support to AudioStreamSample (wav files)

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This commit is contained in:
MrCdK 2018-10-28 19:37:14 +01:00
parent 970b58148f
commit b2bfcb53d6
4 changed files with 21 additions and 6 deletions
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3
doc/classes/AudioStreamSample.xml
View file

@ -62,5 +62,8 @@
<constant name="LOOP_PING_PONG" value="2" enum="LoopMode">
Audio loops the data between loop_begin and loop_end playing back and forth.
</constant>
<constant name="LOOP_BACKWARD" value="3" enum="LoopMode">
Audio loops the data between loop_begin and loop_end playing backward only.
</constant>
</constants>
</class>

14
editor/import/resource_importer_wav.cpp
View file

@ -272,12 +272,18 @@ Error ResourceImporterWAV::import(const String &p_source_file, const String &p_s
for (int i = 0; i < 10; i++)
file->get_32(); // i wish to know why should i do this... no doc!
// only read 0x00 (loop forward) and 0x01 (loop ping-pong) and skip anything else because
// it's not supported (loop backward), reserved for future uses or sampler specific
// only read 0x00 (loop forward), 0x01 (loop ping-pong) and 0x02 (loop backward)
// Skip anything else because it's not supported, reserved for future uses or sampler specific
// from https://sites.google.com/site/musicgapi/technical-documents/wav-file-format#smpl (loop type values table)
int loop_type = file->get_32();
if (loop_type == 0x00 || loop_type == 0x01) {
loop = loop_type ? AudioStreamSample::LOOP_PING_PONG : AudioStreamSample::LOOP_FORWARD;
if (loop_type == 0x00 || loop_type == 0x01 || loop_type == 0x02) {
if (loop_type == 0x00) {
loop = AudioStreamSample::LOOP_FORWARD;
} else if (loop_type == 0x01) {
loop = AudioStreamSample::LOOP_PING_PONG;
} else if (loop_type == 0x02) {
loop = AudioStreamSample::LOOP_BACKWARD;
}
loop_begin = file->get_32();
loop_end = file->get_32();
}

7
scene/resources/audio_stream_sample.cpp
View file

@ -249,6 +249,10 @@ void AudioStreamPlaybackSample::mix(AudioFrame *p_buffer, float p_rate_scale, in
int32_t todo = p_frames;
if (base->loop_mode == AudioStreamSample::LOOP_BACKWARD) {
sign = -1;
}
float base_rate = AudioServer::get_singleton()->get_mix_rate();
float srate = base->mix_rate;
srate *= p_rate_scale;
@ -621,7 +625,7 @@ void AudioStreamSample::_bind_methods() {
ADD_PROPERTY(PropertyInfo(Variant::POOL_BYTE_ARRAY, "data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "set_data", "get_data");
ADD_PROPERTY(PropertyInfo(Variant::INT, "format", PROPERTY_HINT_ENUM, "8-Bit,16-Bit,IMA-ADPCM"), "set_format", "get_format");
ADD_PROPERTY(PropertyInfo(Variant::INT, "loop_mode", PROPERTY_HINT_ENUM, "Disabled,Forward,Ping-Pong"), "set_loop_mode", "get_loop_mode");
ADD_PROPERTY(PropertyInfo(Variant::INT, "loop_mode", PROPERTY_HINT_ENUM, "Disabled,Forward,Ping-Pong,Backward"), "set_loop_mode", "get_loop_mode");
ADD_PROPERTY(PropertyInfo(Variant::INT, "loop_begin"), "set_loop_begin", "get_loop_begin");
ADD_PROPERTY(PropertyInfo(Variant::INT, "loop_end"), "set_loop_end", "get_loop_end");
ADD_PROPERTY(PropertyInfo(Variant::INT, "mix_rate"), "set_mix_rate", "get_mix_rate");
@ -634,6 +638,7 @@ void AudioStreamSample::_bind_methods() {
BIND_ENUM_CONSTANT(LOOP_DISABLED);
BIND_ENUM_CONSTANT(LOOP_FORWARD);
BIND_ENUM_CONSTANT(LOOP_PING_PONG);
BIND_ENUM_CONSTANT(LOOP_BACKWARD);
}
AudioStreamSample::AudioStreamSample() {

3
scene/resources/audio_stream_sample.h
View file

@ -94,7 +94,8 @@ public:
enum LoopMode {
LOOP_DISABLED,
LOOP_FORWARD,
LOOP_PING_PONG
LOOP_PING_PONG,
LOOP_BACKWARD
};
private: