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godot/modules/minimp3/audio_stream_mp3.cpp

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/*************************************************************************/
/* audio_stream_mp3.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#define MINIMP3_ONLY_MP3
#define MINIMP3_FLOAT_OUTPUT
#define MINIMP3_IMPLEMENTATION
#define MINIMP3_NO_STDIO
#include "audio_stream_mp3.h"
#include "core/io/file_access.h"
int AudioStreamPlaybackMP3::_mix_internal(AudioFrame *p_buffer, int p_frames) {
if (!active) {
return 0;
}
int todo = p_frames;
int frames_mixed_this_step = p_frames;
int beat_length_frames = -1;
bool beat_loop = mp3_stream->has_loop() && mp3_stream->get_bpm() > 0 && mp3_stream->get_beat_count() > 0;
if (beat_loop) {
beat_length_frames = mp3_stream->get_beat_count() * mp3_stream->sample_rate * 60 / mp3_stream->get_bpm();
}
while (todo && active) {
mp3dec_frame_info_t frame_info;
mp3d_sample_t *buf_frame = nullptr;
int samples_mixed = mp3dec_ex_read_frame(mp3d, &buf_frame, &frame_info, mp3_stream->channels);
if (samples_mixed) {
p_buffer[p_frames - todo] = AudioFrame(buf_frame[0], buf_frame[samples_mixed - 1]);
if (loop_fade_remaining < FADE_SIZE) {
p_buffer[p_frames - todo] += loop_fade[loop_fade_remaining] * (float(FADE_SIZE - loop_fade_remaining) / float(FADE_SIZE));
loop_fade_remaining++;
}
--todo;
++frames_mixed;
if (beat_loop && (int)frames_mixed >= beat_length_frames) {
for (int i = 0; i < FADE_SIZE; i++) {
samples_mixed = mp3dec_ex_read_frame(mp3d, &buf_frame, &frame_info, mp3_stream->channels);
loop_fade[i] = AudioFrame(buf_frame[0], buf_frame[samples_mixed - 1]);
if (!samples_mixed) {
break;
}
}
loop_fade_remaining = 0;
seek(mp3_stream->loop_offset);
loops++;
}
}
else {
//EOF
if (mp3_stream->loop) {
seek(mp3_stream->loop_offset);
loops++;
} else {
frames_mixed_this_step = p_frames - todo;
//fill remainder with silence
for (int i = p_frames - todo; i < p_frames; i++) {
p_buffer[i] = AudioFrame(0, 0);
}
active = false;
todo = 0;
}
}
}
return frames_mixed_this_step;
}
float AudioStreamPlaybackMP3::get_stream_sampling_rate() {
return mp3_stream->sample_rate;
}
void AudioStreamPlaybackMP3::start(float p_from_pos) {
active = true;
seek(p_from_pos);
loops = 0;
begin_resample();
}
void AudioStreamPlaybackMP3::stop() {
active = false;
}
bool AudioStreamPlaybackMP3::is_playing() const {
return active;
}
int AudioStreamPlaybackMP3::get_loop_count() const {
return loops;
}
float AudioStreamPlaybackMP3::get_playback_position() const {
return float(frames_mixed) / mp3_stream->sample_rate;
}
void AudioStreamPlaybackMP3::seek(float p_time) {
if (!active) {
return;
}
if (p_time >= mp3_stream->get_length()) {
p_time = 0;
}
frames_mixed = uint32_t(mp3_stream->sample_rate * p_time);
mp3dec_ex_seek(mp3d, (uint64_t)frames_mixed * mp3_stream->channels);
}
void AudioStreamPlaybackMP3::tag_used_streams() {
mp3_stream->tag_used(get_playback_position());
}
AudioStreamPlaybackMP3::~AudioStreamPlaybackMP3() {
if (mp3d) {
mp3dec_ex_close(mp3d);
memfree(mp3d);
}
}
Ref<AudioStreamPlayback> AudioStreamMP3::instantiate_playback() {
Ref<AudioStreamPlaybackMP3> mp3s;
ERR_FAIL_COND_V_MSG(data.is_empty(), mp3s,
"This AudioStreamMP3 does not have an audio file assigned "
"to it. AudioStreamMP3 should not be created from the "
"inspector or with `.new()`. Instead, load an audio file.");
mp3s.instantiate();
mp3s->mp3_stream = Ref<AudioStreamMP3>(this);
mp3s->mp3d = (mp3dec_ex_t *)memalloc(sizeof(mp3dec_ex_t));
int errorcode = mp3dec_ex_open_buf(mp3s->mp3d, data.ptr(), data_len, MP3D_SEEK_TO_SAMPLE);
mp3s->frames_mixed = 0;
mp3s->active = false;
mp3s->loops = 0;
if (errorcode) {
ERR_FAIL_COND_V(errorcode, Ref<AudioStreamPlaybackMP3>());
}
return mp3s;
}
String AudioStreamMP3::get_stream_name() const {
return ""; //return stream_name;
}
void AudioStreamMP3::clear_data() {
data.clear();
}
void AudioStreamMP3::set_data(const Vector<uint8_t> &p_data) {
int src_data_len = p_data.size();
const uint8_t *src_datar = p_data.ptr();
mp3dec_ex_t mp3d;
int err = mp3dec_ex_open_buf(&mp3d, src_datar, src_data_len, MP3D_SEEK_TO_SAMPLE);
ERR_FAIL_COND_MSG(err || mp3d.info.hz == 0, "Failed to decode mp3 file. Make sure it is a valid mp3 audio file.");
channels = mp3d.info.channels;
sample_rate = mp3d.info.hz;
length = float(mp3d.samples) / (sample_rate * float(channels));
mp3dec_ex_close(&mp3d);
clear_data();
data.resize(src_data_len);
memcpy(data.ptrw(), src_datar, src_data_len);
data_len = src_data_len;
}
Vector<uint8_t> AudioStreamMP3::get_data() const {
return data;
}
void AudioStreamMP3::set_loop(bool p_enable) {
loop = p_enable;
}
bool AudioStreamMP3::has_loop() const {
return loop;
}
void AudioStreamMP3::set_loop_offset(float p_seconds) {
loop_offset = p_seconds;
}
float AudioStreamMP3::get_loop_offset() const {
return loop_offset;
}
float AudioStreamMP3::get_length() const {
return length;
}
bool AudioStreamMP3::is_monophonic() const {
return false;
}
void AudioStreamMP3::set_bpm(double p_bpm) {
ERR_FAIL_COND(p_bpm < 0);
bpm = p_bpm;
emit_changed();
}
double AudioStreamMP3::get_bpm() const {
return bpm;
}
void AudioStreamMP3::set_beat_count(int p_beat_count) {
ERR_FAIL_COND(p_beat_count < 0);
beat_count = p_beat_count;
emit_changed();
}
int AudioStreamMP3::get_beat_count() const {
return beat_count;
}
void AudioStreamMP3::set_bar_beats(int p_bar_beats) {
ERR_FAIL_COND(p_bar_beats < 0);
bar_beats = p_bar_beats;
emit_changed();
}
int AudioStreamMP3::get_bar_beats() const {
return bar_beats;
}
void AudioStreamMP3::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_data", "data"), &AudioStreamMP3::set_data);
ClassDB::bind_method(D_METHOD("get_data"), &AudioStreamMP3::get_data);
ClassDB::bind_method(D_METHOD("set_loop", "enable"), &AudioStreamMP3::set_loop);
ClassDB::bind_method(D_METHOD("has_loop"), &AudioStreamMP3::has_loop);
ClassDB::bind_method(D_METHOD("set_loop_offset", "seconds"), &AudioStreamMP3::set_loop_offset);
ClassDB::bind_method(D_METHOD("get_loop_offset"), &AudioStreamMP3::get_loop_offset);
ClassDB::bind_method(D_METHOD("set_bpm", "bpm"), &AudioStreamMP3::set_bpm);
ClassDB::bind_method(D_METHOD("get_bpm"), &AudioStreamMP3::get_bpm);
ClassDB::bind_method(D_METHOD("set_beat_count", "count"), &AudioStreamMP3::set_beat_count);
ClassDB::bind_method(D_METHOD("get_beat_count"), &AudioStreamMP3::get_beat_count);
ClassDB::bind_method(D_METHOD("set_bar_beats", "count"), &AudioStreamMP3::set_bar_beats);
ClassDB::bind_method(D_METHOD("get_bar_beats"), &AudioStreamMP3::get_bar_beats);
ADD_PROPERTY(PropertyInfo(Variant::PACKED_BYTE_ARRAY, "data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR), "set_data", "get_data");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "bpm", PROPERTY_HINT_RANGE, "0,400,0.01,or_greater"), "set_bpm", "get_bpm");
ADD_PROPERTY(PropertyInfo(Variant::INT, "beat_count", PROPERTY_HINT_RANGE, "0,512,1,or_greater"), "set_beat_count", "get_beat_count");
ADD_PROPERTY(PropertyInfo(Variant::INT, "bar_beats", PROPERTY_HINT_RANGE, "2,32,1,or_greater"), "set_bar_beats", "get_bar_beats");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "loop"), "set_loop", "has_loop");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "loop_offset"), "set_loop_offset", "get_loop_offset");
}
AudioStreamMP3::AudioStreamMP3() {
}
AudioStreamMP3::~AudioStreamMP3() {
clear_data();
}
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