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implement audio stream seeking in emscripten

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This commit is contained in:
Sebastian Krzyszkowiak 2017-08-24 21:40:34 +02:00
parent 3581c6060c
commit 9a6cbd2449
2 changed files with 12 additions and 9 deletions
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15
src/emscripten-audio-stream.c
View file

@ -210,21 +210,24 @@ SYMBOL_EXPORT unsigned int emscripten_get_available_audio_stream_fragments(ALLEG
}
SYMBOL_EXPORT double emscripten_get_audio_stream_length_sec(ALLEGRO_AUDIO_STREAM *stream) {
// FIXME
EMSCRIPTEN_AUDIO_STREAM *s = (EMSCRIPTEN_AUDIO_STREAM*)stream;
return al_get_sample_instance_length(s->instance);
unsigned int samples_per_sec = al_get_sample_instance_frequency(s->instance);
return al_get_sample_instance_length(s->instance) / (double)samples_per_sec;
}
SYMBOL_EXPORT bool emscripten_seek_audio_stream_secs(ALLEGRO_AUDIO_STREAM *stream, double val) {
// FIXME
EMSCRIPTEN_AUDIO_STREAM *s = (EMSCRIPTEN_AUDIO_STREAM*)stream;
return al_set_sample_instance_position(s->instance, val);
double length = emscripten_get_audio_stream_length_sec(stream);
unsigned int samples = emscripten_get_audio_stream_length(stream);
return al_set_sample_instance_position(s->instance, samples * (val / length));
}
SYMBOL_EXPORT double emscripten_get_audio_stream_position_secs(ALLEGRO_AUDIO_STREAM *stream) {
// FIXME
EMSCRIPTEN_AUDIO_STREAM *s = (EMSCRIPTEN_AUDIO_STREAM*)stream;
return al_get_sample_instance_position(s->instance);
double sample_pos = al_get_sample_instance_position(s->instance);
double length = emscripten_get_audio_stream_length_sec(stream);
unsigned int samples = emscripten_get_audio_stream_length(stream);
return length * (sample_pos / (double)samples);
}
SYMBOL_EXPORT void emscripten_destroy_audio_stream(ALLEGRO_AUDIO_STREAM *stream) {

6
src/emscripten-audio-stream.h
View file

@ -50,9 +50,9 @@ float emscripten_get_audio_stream_gain(ALLEGRO_AUDIO_STREAM *stream);
float emscripten_get_audio_stream_pan(ALLEGRO_AUDIO_STREAM *stream);
bool emscripten_set_audio_stream_speed(ALLEGRO_AUDIO_STREAM *stream, float val);
bool emscripten_set_audio_stream_pan(ALLEGRO_AUDIO_STREAM *stream, float val);
double emscripten_get_audio_stream_length_sec(ALLEGRO_AUDIO_STREAM *stream) __attribute__((deprecated("not implemented yet for Emscripten")));
bool emscripten_seek_audio_stream_secs(ALLEGRO_AUDIO_STREAM *stream, double val) __attribute__((deprecated("not implemented yet for Emscripten")));
double emscripten_get_audio_stream_position_secs(ALLEGRO_AUDIO_STREAM *stream) __attribute__((deprecated("not implemented yet for Emscripten")));
double emscripten_get_audio_stream_length_sec(ALLEGRO_AUDIO_STREAM *stream);
bool emscripten_seek_audio_stream_secs(ALLEGRO_AUDIO_STREAM *stream, double val);
double emscripten_get_audio_stream_position_secs(ALLEGRO_AUDIO_STREAM *stream);
void emscripten_destroy_audio_stream(ALLEGRO_AUDIO_STREAM *stream);
#ifdef ALLEGRO_UNSTABLE
bool emscripten_set_audio_stream_channel_matrix(ALLEGRO_AUDIO_STREAM *stream, const float *val);