pcm_convert: convert to C++

Makefile.am

@@ -331,7 +331,7 @@ libevent_a_SOURCES = \
 libpcm_a_SOURCES = \
 	src/pcm_buffer.c src/pcm_buffer.h \
 	src/pcm_export.c src/pcm_export.h \
-	src/pcm_convert.c src/pcm_convert.h \
+	src/PcmConvert.cxx src/PcmConvert.hxx \
 	src/dsd2pcm/dsd2pcm.c src/dsd2pcm/dsd2pcm.h \
 	src/pcm_dsd.c src/pcm_dsd.h \
 	src/pcm_dsd_usb.c src/pcm_dsd_usb.h \

src/DecoderAPI.cxx

@@ -402,10 +402,11 @@ decoder_data(struct decoder *decoder,
 	}
 
 	if (!audio_format_equals(&dc->in_audio_format, &dc->out_audio_format)) {
-		data = pcm_convert(&decoder->conv_state,
-				   &dc->in_audio_format, data, length,
-				   &dc->out_audio_format, &length,
-				   &error);
+		data = decoder->conv_state.Convert(&dc->in_audio_format,
+						   data, length,
+						   &dc->out_audio_format,
+						   &length,
+						   &error);
 		if (data == NULL) {
 			/* the PCM conversion has failed - stop
 			   playback, since we have no better way to

src/DecoderInternal.cxx

@@ -40,8 +40,6 @@ decoder::~decoder()
 
 	if (decoder_tag != nullptr)
 		tag_free(decoder_tag);
-
-	pcm_convert_deinit(&conv_state);
 }
 
 /**

src/DecoderInternal.hxx

@@ -21,7 +21,7 @@
 #define MPD_DECODER_INTERNAL_HXX
 
 #include "decoder_command.h"
-#include "pcm_convert.h"
+#include "PcmConvert.hxx"
 #include "replay_gain_info.h"
 
 struct input_stream;
@@ -29,7 +29,7 @@ struct input_stream;
 struct decoder {
 	struct decoder_control *dc;
 
-	struct pcm_convert_state conv_state;
+	PcmConvert conv_state;
 
 	/**
 	 * The time stamp of the next data chunk, in seconds.
@@ -91,7 +91,6 @@ struct decoder {
 		 song_tag(_tag), stream_tag(nullptr), decoder_tag(nullptr),
 		 chunk(nullptr),
 		 replay_gain_serial(0) {
-		pcm_convert_init(&conv_state);
 	}
 
 	~decoder();

src/pcm_convert.h → src/PcmConvert.hxx

@@ -17,13 +17,15 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef PCM_CONVERT_H
-#define PCM_CONVERT_H
+#ifndef PCM_CONVERT_HXX
+#define PCM_CONVERT_HXX
 
+extern "C" {
 #include "pcm_dsd.h"
 #include "pcm_resample.h"
 #include "pcm_dither.h"
 #include "pcm_buffer.h"
+}
 
 #include <glib.h>
 
@@ -34,7 +36,7 @@ struct audio_format;
  * holds buffer allocations and the state for all kinds of PCM
  * conversions.
  */
-struct pcm_convert_state {
+class PcmConvert {
 	struct pcm_dsd dsd;
 
 	struct pcm_resample_state resample;
@@ -46,6 +48,61 @@ struct pcm_convert_state {
 
 	/** the buffer for converting the channel count */
 	struct pcm_buffer channels_buffer;
+
+public:
+	PcmConvert();
+	~PcmConvert();
+
+
+	/**
+	 * Reset the pcm_convert_state object.  Use this at the
+	 * boundary between two distinct songs and each time the
+	 * format changes.
+	 */
+	void Reset();
+
+	/**
+	 * Converts PCM data between two audio formats.
+	 *
+	 * @param src_format the source audio format
+	 * @param src the source PCM buffer
+	 * @param src_size the size of #src in bytes
+	 * @param dest_format the requested destination audio format
+	 * @param dest_size_r returns the number of bytes of the destination buffer
+	 * @param error_r location to store the error occurring, or NULL to
+	 * ignore errors
+	 * @return the destination buffer, or NULL on error
+	 */
+	const void *Convert(const audio_format *src_format,
+			    const void *src, size_t src_size,
+			    const audio_format *dest_format,
+			    size_t *dest_size_r,
+			    GError **error_r);
+
+private:
+	const int16_t *Convert16(const audio_format *src_format,
+				 const void *src_buffer, size_t src_size,
+				 const audio_format *dest_format,
+				 size_t *dest_size_r,
+				 GError **error_r);
+
+	const int32_t *Convert24(const audio_format *src_format,
+				 const void *src_buffer, size_t src_size,
+				 const audio_format *dest_format,
+				 size_t *dest_size_r,
+				 GError **error_r);
+
+	const int32_t *Convert32(const audio_format *src_format,
+				 const void *src_buffer, size_t src_size,
+				 const audio_format *dest_format,
+				 size_t *dest_size_r,
+				 GError **error_r);
+
+	const float *ConvertFloat(const audio_format *src_format,
+				  const void *src_buffer, size_t src_size,
+				  const audio_format *dest_format,
+				  size_t *dest_size_r,
+				  GError **error_r);
 };
 
 static inline GQuark
@@ -54,47 +111,4 @@ pcm_convert_quark(void)
 	return g_quark_from_static_string("pcm_convert");
 }
 
-G_BEGIN_DECLS
-
-/**
- * Initializes a pcm_convert_state object.
- */
-void pcm_convert_init(struct pcm_convert_state *state);
-
-/**
- * Deinitializes a pcm_convert_state object and frees allocated
- * memory.
- */
-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.
- *
- * @param state an initialized pcm_convert_state object
- * @param src_format the source audio format
- * @param src the source PCM buffer
- * @param src_size the size of #src in bytes
- * @param dest_format the requested destination audio format
- * @param dest_size_r returns the number of bytes of the destination buffer
- * @param error_r location to store the error occurring, or NULL to
- * ignore errors
- * @return the destination buffer, or NULL on error
- */
-const void *
-pcm_convert(struct pcm_convert_state *state,
-	    const struct audio_format *src_format,
-	    const void *src, size_t src_size,
-	    const struct audio_format *dest_format,
-	    size_t *dest_size_r,
-	    GError **error_r);
-
-G_END_DECLS
-
 #endif

src/filter/ConvertFilterPlugin.cxx

@@ -23,7 +23,8 @@
 #include "filter_internal.h"
 #include "filter_registry.h"
 #include "conf.h"
-#include "pcm_convert.h"
+#include "PcmConvert.hxx"
+#include "util/Manual.hxx"
 #include "audio_format.h"
 #include "poison.h"
 
@@ -51,7 +52,7 @@ struct ConvertFilter {
 	 */
 	struct audio_format out_audio_format;
 
-	struct pcm_convert_state state;
+	Manual<PcmConvert> state;
 
 	ConvertFilter() {
 		filter_init(&base, &convert_filter_plugin);
@@ -81,7 +82,7 @@ convert_filter_open(struct filter *_filter, struct audio_format *audio_format,
 	assert(audio_format_valid(audio_format));
 
 	filter->in_audio_format = filter->out_audio_format = *audio_format;
-	pcm_convert_init(&filter->state);
+	filter->state.Construct();
 
 	return &filter->in_audio_format;
 }
@@ -91,7 +92,7 @@ convert_filter_close(struct filter *_filter)
 {
 	ConvertFilter *filter = (ConvertFilter *)_filter;
 
-	pcm_convert_deinit(&filter->state);
+	filter->state.Destruct();
 
 	poison_undefined(&filter->in_audio_format,
 			 sizeof(filter->in_audio_format));
@@ -113,10 +114,10 @@ convert_filter_filter(struct filter *_filter, const void *src, size_t src_size,
 		return src;
 	}
 
-	dest = pcm_convert(&filter->state, &filter->in_audio_format,
-			   src, src_size,
-			   &filter->out_audio_format, dest_size_r,
-			   error_r);
+	dest = filter->state->Convert(&filter->in_audio_format,
+				      src, src_size,
+				      &filter->out_audio_format, dest_size_r,
+				      error_r);
 	if (dest == NULL)
 		return NULL;
 

test/run_convert.cxx

@@ -26,7 +26,7 @@
 #include "config.h"
 #include "AudioParser.hxx"
 #include "audio_format.h"
-#include "pcm_convert.h"
+#include "PcmConvert.hxx"
 #include "conf.h"
 #include "util/fifo_buffer.h"
 #include "stdbin.h"
@@ -58,7 +58,6 @@ int main(int argc, char **argv)
 {
 	GError *error = NULL;
 	struct audio_format in_audio_format, out_audio_format;
-	struct pcm_convert_state state;
 	const void *output;
 	ssize_t nbytes;
 	size_t length;
@@ -90,7 +89,7 @@ int main(int argc, char **argv)
 
 	const size_t in_frame_size = audio_format_frame_size(&in_audio_format);
 
-	pcm_convert_init(&state);
+	PcmConvert state;
 
 	struct fifo_buffer *buffer = fifo_buffer_new(4096);
 
@@ -113,8 +112,8 @@ int main(int argc, char **argv)
 
 		fifo_buffer_consume(buffer, length);
 
-		output = pcm_convert(&state, &in_audio_format, src, length,
-				     &out_audio_format, &length, &error);
+		output = state.Convert(&in_audio_format, src, length,
+				       &out_audio_format, &length, &error);
 		if (output == NULL) {
 			g_printerr("Failed to convert: %s\n", error->message);
 			return 2;
@@ -123,5 +122,5 @@ int main(int argc, char **argv)
 		G_GNUC_UNUSED ssize_t ignored = write(1, output, length);
 	}
 
-	pcm_convert_deinit(&state);
+	return EXIT_SUCCESS;
 }

test/run_output.cxx

@@ -27,12 +27,12 @@
 #include "IOThread.hxx"
 #include "fs/Path.hxx"
 #include "AudioParser.hxx"
+#include "PcmConvert.hxx"
 
 extern "C" {
 #include "output_plugin.h"
 #include "output_internal.h"
 #include "filter_registry.h"
-#include "pcm_convert.h"
 }
 
 #include "PlayerControl.hxx"
@@ -52,21 +52,15 @@ GlobalEvents::Emit(gcc_unused Event event)
 {
 }
 
-void pcm_convert_init(G_GNUC_UNUSED struct pcm_convert_state *state)
-{
-}
-
-void pcm_convert_deinit(G_GNUC_UNUSED struct pcm_convert_state *state)
-{
-}
+PcmConvert::PcmConvert() {}
+PcmConvert::~PcmConvert() {}
 
 const void *
-pcm_convert(G_GNUC_UNUSED struct pcm_convert_state *state,
-	    G_GNUC_UNUSED const struct audio_format *src_format,
-	    G_GNUC_UNUSED const void *src, G_GNUC_UNUSED size_t src_size,
-	    G_GNUC_UNUSED const struct audio_format *dest_format,
-	    G_GNUC_UNUSED size_t *dest_size_r,
-	    GError **error_r)
+PcmConvert::Convert(gcc_unused const audio_format *src_format,
+		    gcc_unused const void *src, gcc_unused size_t src_size,
+		    gcc_unused const audio_format *dest_format,
+		    gcc_unused size_t *dest_size_r,
+		    gcc_unused GError **error_r)
 {
 	g_set_error(error_r, pcm_convert_quark(), 0,
 		    "Not implemented");