Merge "Add support for reading 8-bit PCM"
diff --git a/audio_utils/include/audio_utils/primitives.h b/audio_utils/include/audio_utils/primitives.h
index 00b5cd9..64ec6e2 100644
--- a/audio_utils/include/audio_utils/primitives.h
+++ b/audio_utils/include/audio_utils/primitives.h
@@ -44,6 +44,17 @@
*/
void memcpy_to_i16_from_u8(int16_t *dst, const uint8_t *src, size_t count);
+/* Shrink and copy samples from signed 16-bit to unsigned 8-bit offset by 0x80.
+ * Parameters:
+ * dst Destination buffer
+ * src Source buffer
+ * count Number of samples to copy
+ * The destination and source buffers must either be completely separate (non-overlapping), or
+ * they must both start at the same address. Partially overlapping buffers are not supported.
+ * The conversion is done by truncation, without dithering, so it loses resolution.
+ */
+void memcpy_to_u8_from_i16(uint8_t *dst, const int16_t *src, size_t count);
+
/* Downmix pairs of interleaved stereo input 16-bit samples to mono output 16-bit samples.
* Parameters:
* dst Destination buffer
diff --git a/audio_utils/primitives.c b/audio_utils/primitives.c
index bec87e0..af9ab40 100644
--- a/audio_utils/primitives.c
+++ b/audio_utils/primitives.c
@@ -39,6 +39,13 @@
}
}
+void memcpy_to_u8_from_i16(uint8_t *dst, const int16_t *src, size_t count)
+{
+ while (count--) {
+ *dst++ = (*src++ >> 8) + 0x80;
+ }
+}
+
void downmix_to_mono_i16_from_stereo_i16(int16_t *dst, const int16_t *src, size_t count)
{
while (count--) {
