shithub: audio-stretch

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added stretch_reset() to drop internal state, e.g. after changing/seeking input

also made input samples const

Signed-off-by: hayati ayguen <[email protected]>

--- a/stretch.c

+++ b/stretch.c

@@ -82,6 +82,18 @@

 }

 /*

+ * Re-Initialize a context of the time stretching code - as if freshly created

+ * with stretch_init(). This drops all internal state.

+ */

+

+void stretch_reset (StretchHandle handle)

+{

+  struct stretch_cnxt *cnxt = (struct stretch_cnxt *) handle;

+  cnxt->head = cnxt->tail = cnxt->longest;

+}

+

+

+/*

  * Process the specified samples with the given ratio (which is clipped to the

  * range 0.5 to 2.0). Note that the number of samples refers to total samples for

  * both channels in stereo and can be as large as desired (samples are buffered

@@ -90,7 +102,7 @@

  * plus or minus 3X the longest period.

  */

-int stretch_samples (StretchHandle handle, short *samples, int num_samples, short *output, float ratio)

+int stretch_samples (StretchHandle handle, const short *samples, int num_samples, short *output, float ratio)

 {

     struct stretch_cnxt *cnxt = (struct stretch_cnxt *) handle;

     int out_samples = 0;

--- a/stretch.h

+++ b/stretch.h

@@ -25,8 +25,9 @@

 typedef void *StretchHandle;

 StretchHandle stretch_init (int shortest_period, int longest_period, int num_chans, int fast_mode);

-int stretch_samples (StretchHandle handle, short *samples, int num_samples, short *output, float ratio);

+int stretch_samples (StretchHandle handle, const short *samples, int num_samples, short *output, float ratio);

 int stretch_flush (StretchHandle handle, short *output);

+void stretch_reset (StretchHandle handle);

 void stretch_deinit (StretchHandle handle);

 #ifdef __cplusplus