Detect peaks in the volume for steering normalizers and dynamic range compressors While normalizers and dynamic range controls are out of the scope of gavl, some low-level functionality can be provided.
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GAVL_PUBLIC gavl_peak_detector_t * | gavl_peak_detector_create () |
| Create peak detector. More...
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GAVL_PUBLIC void | gavl_peak_detector_set_callbacks (gavl_peak_detector_t *pd, gavl_update_peak_callback peak_callback, gavl_update_peaks_callback peaks_callback, void *priv) |
| Set callbacks. More...
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GAVL_PUBLIC void | gavl_peak_detector_destroy (gavl_peak_detector_t *pd) |
| Destroys a peak detector and frees all associated memory. More...
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GAVL_PUBLIC void | gavl_peak_detector_set_format (gavl_peak_detector_t *pd, const gavl_audio_format_t *format) |
| Set format for a peak detector. More...
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GAVL_PUBLIC const gavl_audio_format_t * | gavl_peak_detector_get_format (gavl_peak_detector_t *pd) |
| Get format. More...
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GAVL_PUBLIC void | gavl_peak_detector_update (gavl_peak_detector_t *pd, gavl_audio_frame_t *frame) |
| Feed the peak detector with a new frame. More...
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GAVL_PUBLIC gavl_audio_sink_t * | gavl_peak_detector_get_sink (gavl_peak_detector_t *pd) |
| Get the audio sink. More...
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GAVL_PUBLIC void | gavl_peak_detector_get_peak (gavl_peak_detector_t *pd, double *min, double *max, double *abs) |
| Get the peak volume across all channels. More...
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GAVL_PUBLIC void | gavl_peak_detector_get_peaks (gavl_peak_detector_t *pd, double *min, double *max, double *abs) |
| Get the peak volume for all channels separate. More...
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GAVL_PUBLIC void | gavl_peak_detector_reset (gavl_peak_detector_t *pd) |
| Reset a peak detector. More...
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Detect peaks in the volume for steering normalizers and dynamic range compressors While normalizers and dynamic range controls are out of the scope of gavl, some low-level functionality can be provided.
◆ gavl_peak_detector_t
Opaque structure for peak detector.
You don't want to know what's inside.
◆ gavl_update_peak_callback
typedef void(* gavl_update_peak_callback) (void *priv, int samples, double min, double max, double abs) |
Callback for getting the peaks across all channels.
- Parameters
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priv | Client data |
samples | Number of samples of last update call |
min | Minimum value (scaled betwen -1.0 and 1.0) |
min | Maximum value (scaled betwen -1.0 and 1.0) |
abs | Absolute value (scaled betwen 0.0 and 1.0) |
Since 1.5.0
◆ gavl_update_peaks_callback
typedef void(* gavl_update_peaks_callback) (void *priv, int samples, const double *min, const double *max, const double *abs) |
Callback for getting the peaks for all channels separately.
- Parameters
-
priv | Client data |
samples | Number of samples of last update call |
min | Minimum value (scaled betwen -1.0 and 1.0) |
min | Maximum value (scaled betwen -1.0 and 1.0) |
abs | Absolute value (scaled betwen 0.0 and 1.0) |
Since 1.5.0
◆ gavl_peak_detector_create()
Create peak detector.
- Returns
- A newly allocated peak detector
◆ gavl_peak_detector_set_callbacks()
Set callbacks.
- Parameters
-
pd | A peak detector |
peak_callback | Callback for overall peaks or NULL |
peaks_callback | Callback for per channel peaks or NULL |
priv | Client data passed to the callbacks |
Since 1.5.0
◆ gavl_peak_detector_destroy()
Destroys a peak detector and frees all associated memory.
- Parameters
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◆ gavl_peak_detector_set_format()
Set format for a peak detector.
- Parameters
-
pd | A peak detector |
format | The format subsequent frames will be passed with |
This function can be called multiple times with one instance. It also calls gavl_peak_detector_reset.
◆ gavl_peak_detector_get_format()
Get format.
- Parameters
-
- Returns
- The internal format
Since 1.5.0
◆ gavl_peak_detector_update()
Feed the peak detector with a new frame.
- Parameters
-
pd | A peak detector |
frame | An audio frame |
◆ gavl_peak_detector_get_sink()
Get the audio sink.
- Parameters
-
- Returns
- An audio sink
Use the returned sink for passing audio frames as an alternative to gavl_peak_detector_update
Since 1.5.0
◆ gavl_peak_detector_get_peak()
GAVL_PUBLIC void gavl_peak_detector_get_peak |
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gavl_peak_detector_t * |
pd, |
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double * |
min, |
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double * |
max, |
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double * |
abs |
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Get the peak volume across all channels.
- Parameters
-
pd | A peak detector |
min | Returns minimum amplitude |
max | Returns maximum amplitude |
abs | Returns maximum absolute amplitude |
The returned amplitudes are normalized such that the minimum amplitude corresponds to -1.0, the maximum amplitude corresponds to 1.0.
◆ gavl_peak_detector_get_peaks()
GAVL_PUBLIC void gavl_peak_detector_get_peaks |
( |
gavl_peak_detector_t * |
pd, |
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double * |
min, |
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double * |
max, |
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double * |
abs |
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) |
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Get the peak volume for all channels separate.
- Parameters
-
pd | A peak detector |
min | Returns minimum amplitude |
max | Returns maximum amplitude |
abs | Returns maximum absolute amplitude |
The returned amplitudes are normalized such that the minimum amplitude corresponds to -1.0, the maximum amplitude corresponds to 1.0.
◆ gavl_peak_detector_reset()
Reset a peak detector.
- Parameters
-