2 files changed, 90 insertions, 0 deletions
diff --git a/src/pcm_format.c b/src/pcm_format.c
index 205966a6e..9ef1a9504 100644
--- a/src/pcm_format.c
+++ b/src/pcm_format.c
@@ -133,3 +133,78 @@ pcm_convert_to_24(struct pcm_buffer *buffer,
 	g_warning("only 8 or 24 bits are supported for conversion!\n");
 	return NULL;
 }
+
+static void
+pcm_convert_8_to_32(int32_t *out, const int8_t *in,
+		    unsigned num_samples)
+{
+	while (num_samples > 0) {
+		*out++ = *in++ << 24;
+		--num_samples;
+	}
+}
+
+static void
+pcm_convert_16_to_32(int32_t *out, const int16_t *in,
+		     unsigned num_samples)
+{
+	while (num_samples > 0) {
+		*out++ = *in++ << 16;
+		--num_samples;
+	}
+}
+
+static void
+pcm_convert_24_to_32(int32_t *out, const int32_t *in,
+		     unsigned num_samples)
+{
+	while (num_samples > 0) {
+		*out++ = *in++ << 8;
+		--num_samples;
+	}
+}
+
+const int32_t *
+pcm_convert_to_32(struct pcm_buffer *buffer,
+		  uint8_t bits, const void *src,
+		  size_t src_size, size_t *dest_size_r)
+{
+	unsigned num_samples;
+	int32_t *dest;
+
+	switch (bits) {
+	case 8:
+		num_samples = src_size;
+		*dest_size_r = src_size * sizeof(*dest);
+		dest = pcm_buffer_get(buffer, *dest_size_r);
+
+		pcm_convert_8_to_32(dest, (const int8_t *)src,
+				    num_samples);
+		return dest;
+
+	case 16:
+		num_samples = src_size / 2;
+		*dest_size_r = num_samples * sizeof(*dest);
+		dest = pcm_buffer_get(buffer, *dest_size_r);
+
+		pcm_convert_16_to_32(dest, (const int16_t *)src,
+				     num_samples);
+		return dest;
+
+	case 24:
+		num_samples = src_size / 4;
+		*dest_size_r = num_samples * sizeof(*dest);
+		dest = pcm_buffer_get(buffer, *dest_size_r);
+
+		pcm_convert_24_to_32(dest, (const int32_t *)src,
+				     num_samples);
+		return dest;
+
+	case 32:
+		*dest_size_r = src_size;
+		return src;
+	}
+
+	g_warning("only 8 or 32 bits are supported for conversion!\n");
+	return NULL;
+}
diff --git a/src/pcm_format.h b/src/pcm_format.h
index 53547df5d..3da10f2a7 100644
--- a/src/pcm_format.h
+++ b/src/pcm_format.h
@@ -57,4 +57,19 @@ pcm_convert_to_24(struct pcm_buffer *buffer,
 		  uint8_t bits, const void *src,
 		  size_t src_size, size_t *dest_size_r);
 
+/**
+ * Converts PCM samples to 32 bit.
+ *
+ * @param buffer a pcm_buffer object
+ * @param bits the number of in the source buffer
+ * @param src the source PCM buffer
+ * @param src_size the size of #src in bytes
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const int32_t *
+pcm_convert_to_32(struct pcm_buffer *buffer,
+		  uint8_t bits, const void *src,
+		  size_t src_size, size_t *dest_size_r);
+
 #endif