pcm_convert: add method _reset()

Resets the libsamplerate state.  Not being used yet.

src/pcm_convert.c

@@ -57,6 +57,12 @@ void pcm_convert_deinit(struct pcm_convert_state *state)
 	pcm_buffer_deinit(&state->byteswap_buffer);
 }
 
+void
+pcm_convert_reset(struct pcm_convert_state *state)
+{
+	pcm_resample_reset(&state->resample);
+}
+
 static const void *
 pcm_convert_channels(struct pcm_buffer *buffer, enum sample_format format,
 		     uint8_t dest_channels,

src/pcm_convert.h

@@ -66,6 +66,13 @@ void pcm_convert_init(struct pcm_convert_state *state);
  */
 void pcm_convert_deinit(struct pcm_convert_state *state);
 
+/**
+ * Reset the pcm_convert_state object.  Use this at the boundary
+ * between two distinct songs and each time the format changes.
+ */
+void
+pcm_convert_reset(struct pcm_convert_state *state);
+
 /**
  * Converts PCM data between two audio formats.
  *

src/pcm_resample.c

@@ -76,6 +76,16 @@ void pcm_resample_deinit(struct pcm_resample_state *state)
 		pcm_resample_fallback_deinit(state);
 }
 
+void
+pcm_resample_reset(struct pcm_resample_state *state)
+{
+#ifdef HAVE_LIBSAMPLERATE
+	pcm_resample_lsr_reset(state);
+#else
+	(void)state;
+#endif
+}
+
 const float *
 pcm_resample_float(struct pcm_resample_state *state,
 		   unsigned channels,

src/pcm_resample.h

@@ -68,6 +68,12 @@ void pcm_resample_init(struct pcm_resample_state *state);
  */
 void pcm_resample_deinit(struct pcm_resample_state *state);
 
+/**
+ * @see pcm_convert_reset()
+ */
+void
+pcm_resample_reset(struct pcm_resample_state *state);
+
 /**
  * Resamples 32 bit float data.
  *

src/pcm_resample_internal.h

@@ -41,6 +41,9 @@ pcm_resample_lsr_init(struct pcm_resample_state *state);
 void
 pcm_resample_lsr_deinit(struct pcm_resample_state *state);
 
+void
+pcm_resample_lsr_reset(struct pcm_resample_state *state);
+
 const float *
 pcm_resample_lsr_float(struct pcm_resample_state *state,
 		       unsigned channels,

src/pcm_resample_libsamplerate.c

@@ -104,6 +104,13 @@ pcm_resample_lsr_deinit(struct pcm_resample_state *state)
 	pcm_buffer_deinit(&state->buffer);
 }
 
+void
+pcm_resample_lsr_reset(struct pcm_resample_state *state)
+{
+	if (state->state != NULL)
+		src_reset(state->state);
+}
+
 static bool
 pcm_resample_set(struct pcm_resample_state *state,
 		 unsigned channels, unsigned src_rate, unsigned dest_rate,