149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
/*
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DeaDBeeF -- the music player
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Copyright (C) 2009-2021 Alexey Yakovenko and other contributors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef analyzer_h
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#define analyzer_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define DDB_ANALYZER_MAX_LABEL_FREQS 20
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typedef struct {
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float freq;
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float ratio;
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int bin;
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} ddb_analyzer_band_t;
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typedef struct {
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// interpolation data
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int bin;
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int last_bin;
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float ratio;
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// normalized position
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float xpos;
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float height;
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float peak;
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float peak_speed;
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} ddb_analyzer_bar_t;
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typedef struct {
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float xpos;
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float peak_ypos;
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float bar_height;
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} ddb_analyzer_draw_bar_t;
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typedef struct {
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int bar_count;
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ddb_analyzer_draw_bar_t *bars;
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float bar_width;
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// freq label drawing positions in view space
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float label_freq_positions[DDB_ANALYZER_MAX_LABEL_FREQS];
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char label_freq_texts[DDB_ANALYZER_MAX_LABEL_FREQS][4];
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int label_freq_count;
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} ddb_analyzer_draw_data_t;
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typedef enum {
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DDB_ANALYZER_MODE_FREQUENCIES,
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DDB_ANALYZER_MODE_OCTAVE_NOTE_BANDS,
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} ddb_analyzer_mode_t;
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typedef struct ddb_analyzer_s {
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// Settings
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float min_freq;
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float max_freq;
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ddb_analyzer_mode_t mode;
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/// Set to 1 after changing the @c mode or @c octave_bars_step at runtime, to refresh the internal state
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int mode_did_change;
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/// Generate fractional bar positions and width. Default is 0.
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int fractional_bars;
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/// Process 2 channels, if available, and use the max value. Default is 0.
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int max_of_stereo_data;
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/// How to calculate the gap between bars. E.g. 10 means bar_width/10. Default is 3.
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/// If this value is 0, no gap will be created.
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/// If the gap is >=1, a gap of at least 1px will be created, unless the bar width itself is 1px.
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int bar_gap_denominator;
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/// Can be either a real or virtual view width.
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/// The calculated values are normalized,
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/// and are going to be converted to the real view size at the draw time.
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int view_width;
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float peak_hold; // how many frames to hold the peak in place
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float peak_speed_scale;
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float db_upper_bound; // dB value corresponding to the top of the view
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float db_lower_bound; // dB value corresponding to the bottom of the view
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int octave_bars_step; // how many notes in one bar (default 1)
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int freq_is_log; // whether frequency mode is in logarithmic or linear space (default 1)
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/// The bars get created / updated by calling @c ddb_analyzer_process.
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/// The same bars get updated on every call to @c ddb_analyzer_tick.
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ddb_analyzer_bar_t *bars;
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int bar_count;
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int bar_count_max;
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int samplerate;
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int channels;
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int fft_size;
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float *fft_data;
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/// Calculated label texts and frequencies
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float label_freq_positions[DDB_ANALYZER_MAX_LABEL_FREQS];
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char label_freq_texts[DDB_ANALYZER_MAX_LABEL_FREQS][4];
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int label_freq_count;
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/// Tempered scale data, precalculated from fft pins
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ddb_analyzer_band_t *tempered_scale_bands;
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} ddb_analyzer_t;
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ddb_analyzer_t *ddb_analyzer_alloc(void);
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ddb_analyzer_t *ddb_analyzer_init(ddb_analyzer_t *analyzer);
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void ddb_analyzer_dealloc(ddb_analyzer_t *analyzer);
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void ddb_analyzer_free(ddb_analyzer_t *analyzer);
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/// Process fft data into bars and peaks
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void ddb_analyzer_process(ddb_analyzer_t *analyzer, int samplerate, int channels, const float *fft_data, int fft_size);
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/// Update bars and peaks for the next frame
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void ddb_analyzer_tick(ddb_analyzer_t *analyzer);
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void ddb_analyzer_get_draw_data(ddb_analyzer_t *analyzer, int view_width, int view_height, ddb_analyzer_draw_data_t *draw_data);
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void ddb_analyzer_draw_data_dealloc(ddb_analyzer_draw_data_t *draw_data);
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#ifdef __cplusplus
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}
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#endif
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#endif /* analyzer_h */
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