pcm/PcmDsd: use struct ConstBuffer

src/pcm/PcmConvert.cxx

@@ -22,6 +22,7 @@
 #include "PcmChannels.hxx"
 #include "PcmFormat.hxx"
 #include "AudioFormat.hxx"
+#include "util/ConstBuffer.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 
@@ -287,39 +288,39 @@ PcmConvert::Convert(const void *src, size_t src_size,
 		    size_t *dest_size_r,
 		    Error &error)
 {
+	ConstBuffer<void> buffer(src, src_size);
+
 	if (is_dsd) {
-		size_t f_size;
-		const float *f = dsd.ToFloat(src_format.channels,
-					     false, (const uint8_t *)src,
-					     src_size, &f_size);
-		if (f == nullptr) {
+		auto s = ConstBuffer<uint8_t>::FromVoid(buffer);
+		auto d = dsd.ToFloat(src_format.channels,
+				     false, s);
+		if (d.IsNull()) {
 			error.Set(pcm_convert_domain,
 				  "DSD to PCM conversion failed");
 			return nullptr;
 		}
 
-		src = f;
-		src_size = f_size;
+		buffer = d.ToVoid();
 	}
 
 	switch (dest_format.format) {
 	case SampleFormat::S16:
-		return Convert16(src, src_size,
+		return Convert16(buffer.data, buffer.size,
 				 dest_size_r,
 				 error);
 
 	case SampleFormat::S24_P32:
-		return Convert24(src, src_size,
+		return Convert24(buffer.data, buffer.size,
 				 dest_size_r,
 				 error);
 
 	case SampleFormat::S32:
-		return Convert32(src, src_size,
+		return Convert32(buffer.data, buffer.size,
 				 dest_size_r,
 				 error);
 
 	case SampleFormat::FLOAT:
-		return ConvertFloat(src, src_size,
+		return ConvertFloat(buffer.data, buffer.size,
 				    dest_size_r,
 				    error);
 

src/pcm/PcmDsd.cxx

@@ -21,6 +21,7 @@
 #include "PcmDsd.hxx"
 #include "dsd2pcm/dsd2pcm.h"
 #include "util/Macros.hxx"
+#include "util/ConstBuffer.hxx"
 
 #include <algorithm>
 
@@ -46,22 +47,20 @@ PcmDsd::Reset()
 			dsd2pcm_reset(dsd2pcm[i]);
 }
 
-const float *
+ConstBuffer<float>
 PcmDsd::ToFloat(unsigned channels, bool lsbfirst,
-		const uint8_t *src, size_t src_size,
-		size_t *dest_size_r)
+		ConstBuffer<uint8_t> src)
 {
-	assert(src != nullptr);
-	assert(src_size > 0);
-	assert(src_size % channels == 0);
+	assert(!src.IsNull());
+	assert(!src.IsEmpty());
+	assert(src.size % channels == 0);
 	assert(channels <= ARRAY_SIZE(dsd2pcm));
 
-	const unsigned num_samples = src_size;
-	const unsigned num_frames = src_size / channels;
+	const unsigned num_samples = src.size;
+	const unsigned num_frames = src.size / channels;
 
 	float *dest;
 	const size_t dest_size = num_samples * sizeof(*dest);
-	*dest_size_r = dest_size;
 	dest = (float *)buffer.Get(dest_size);
 
 	for (unsigned c = 0; c < channels; ++c) {
@@ -72,9 +71,9 @@ PcmDsd::ToFloat(unsigned channels, bool lsbfirst,
 		}
 
 		dsd2pcm_translate(dsd2pcm[c], num_frames,
-				  src + c, channels,
+				  src.data + c, channels,
 				  lsbfirst, dest + c, channels);
 	}
 
-	return dest;
+	return { dest, num_samples };
 }

src/pcm/PcmDsd.hxx

@@ -25,6 +25,8 @@
 
 #include <stdint.h>
 
+template<typename T> struct ConstBuffer;
+
 /**
  * Wrapper for the dsd2pcm library.
  */
@@ -39,9 +41,8 @@ public:
 
 	void Reset();
 
-	const float *ToFloat(unsigned channels, bool lsbfirst,
-			     const uint8_t *src, size_t src_size,
-			     size_t *dest_size_r);
+	ConstBuffer<float> ToFloat(unsigned channels, bool lsbfirst,
+				   ConstBuffer<uint8_t> src);
 };
 
 #endif