audio: component: Add const to source buffer parameter in cir_buf_copy()

Qualify the source pointer of circular buffer as const in cir_buf_copy()
and cir_buf_bytes_without_wrap() functions.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Author: softwarecki

src/audio/component.c

@@ -269,7 +269,7 @@ int audio_stream_copy(const struct audio_stream *source, uint32_t ioffset,
 	return samples;
 }
 
-void cir_buf_copy(void *src, void *src_addr, void *src_end, void *dst,
+void cir_buf_copy(const void *src, const void *src_addr, const void *src_end, void *dst,
 		  void *dst_addr, void *dst_end, size_t byte_size)
 {
 	size_t bytes = byte_size;
@@ -281,7 +281,7 @@ void cir_buf_copy(void *src, void *src_addr, void *src_end, void *dst,
 	ae_int16x4 in_sample1, in_sample2;
 	ae_valignx2 inu;
 	ae_valignx2 outu = AE_ZALIGN128();
-	ae_int16x8 *in = (ae_int16x8 *)src;
+	const ae_int16x8 *in = cir_buf_wrap(src, src_addr, src_end);
 	ae_int16x8 *out = (ae_int16x8 *)dst;
 
 	while (bytes) {
@@ -360,7 +360,7 @@ int audio_stream_copy(const struct audio_stream *source, uint32_t ioffset,
 	return samples;
 }
 
-void cir_buf_copy(void *src, void *src_addr, void *src_end, void *dst,
+void cir_buf_copy(const void *src, const void *src_addr, const void *src_end, void *dst,
 		  void *dst_addr, void *dst_end, size_t byte_size)
 {
 	size_t bytes = byte_size;
@@ -373,7 +373,7 @@ void cir_buf_copy(void *src, void *src_addr, void *src_end, void *dst,
 	ae_int16x4 in_sample = AE_ZERO16();
 	ae_valign inu = AE_ZALIGN64();
 	ae_valign outu = AE_ZALIGN64();
-	ae_int16x4 *in = (ae_int16x4 *)src;
+	ae_int16x4 *in = cir_buf_wrap(src, src_addr, src_end);
 	ae_int16x4 *out = (ae_int16x4 *)dst;
 
 	while (bytes) {
@@ -433,14 +433,14 @@ int audio_stream_copy(const struct audio_stream *source, uint32_t ioffset,
 	return samples;
 }
 
-void cir_buf_copy(void *src, void *src_addr, void *src_end, void *dst,
+void cir_buf_copy(const void *src, const void *src_addr, const void *src_end, void *dst,
 		  void *dst_addr, void *dst_end, size_t byte_size)
 {
 	size_t bytes = byte_size;
 	size_t bytes_src;
 	size_t bytes_dst;
 	size_t bytes_copied;
-	uint8_t *in = (uint8_t *)src;
+	const uint8_t *in = src;
 	uint8_t *out = (uint8_t *)dst;
 
 	while (bytes) {

src/include/sof/audio/audio_stream.h

@@ -902,7 +902,7 @@ audio_stream_samples_without_wrap_s32(const struct audio_stream *source, const v
  * @return Number of bytes to buffer wrap. For number of samples calculate
  *	   need to add size of sample to returned bytes count.
  */
-static inline int cir_buf_bytes_without_wrap(void *ptr, void *buf_end)
+static inline int cir_buf_bytes_without_wrap(const void *ptr, const void *buf_end)
 {
 	assert((intptr_t)buf_end >= (intptr_t)ptr);
 	return (intptr_t)buf_end - (intptr_t)ptr;
@@ -946,7 +946,7 @@ int audio_stream_copy(const struct audio_stream *source, uint32_t ioffset,
  * @param dst_end End address of sink circular buffer.
  * @param byte_size Number of bytes to copy.
  */
-void cir_buf_copy(void *src, void *src_addr, void *src_end, void *dst,
+void cir_buf_copy(const void *src, const void *src_addr, const void *src_end, void *dst,
 		  void *dst_addr, void *dst_end, size_t byte_size);
 
 /**