1 files changed, 148 insertions, 0 deletions
diff --git a/src/pcm_format.c b/src/pcm_format.c
new file mode 100644
index 000000000..9e6f42265
--- /dev/null
+++ b/src/pcm_format.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "pcm_format.h"
+#include "pcm_utils.h"
+
+#include <glib.h>
+
+static void
+pcm_convert_8_to_16(int16_t *out, const int8_t *in,
+		    unsigned num_samples)
+{
+	while (num_samples > 0) {
+		*out++ = *in++ << 8;
+		--num_samples;
+	}
+}
+
+static void
+pcm_convert_24_to_16(struct pcm_dither_24 *dither,
+		     int16_t *out, const int32_t *in,
+		     unsigned num_samples)
+{
+	pcm_dither_24_to_16(dither, out, in, num_samples);
+}
+
+const int16_t *
+pcm_convert_to_16(struct pcm_convert_state *convert,
+		  uint8_t bits, const void *src,
+		  size_t src_size, size_t *dest_size_r)
+{
+	static int16_t *buf;
+	static size_t len;
+	unsigned num_samples;
+
+	switch (bits) {
+	case 8:
+		num_samples = src_size;
+		*dest_size_r = src_size << 1;
+		if (*dest_size_r > len) {
+			len = *dest_size_r;
+			buf = g_realloc(buf, len);
+		}
+
+		pcm_convert_8_to_16((int16_t *)buf,
+				    (const int8_t *)src,
+				    num_samples);
+		return buf;
+
+	case 16:
+		*dest_size_r = src_size;
+		return src;
+
+	case 24:
+		num_samples = src_size / 4;
+		*dest_size_r = num_samples * 2;
+		if (*dest_size_r > len) {
+			len = *dest_size_r;
+			buf = g_realloc(buf, len);
+		}
+
+		pcm_convert_24_to_16(&convert->dither,
+				     (int16_t *)buf,
+				     (const int32_t *)src,
+				     num_samples);
+		return buf;
+	}
+
+	g_warning("only 8 or 16 bits are supported for conversion!\n");
+	return NULL;
+}
+
+static void
+pcm_convert_8_to_24(int32_t *out, const int8_t *in,
+		    unsigned num_samples)
+{
+	while (num_samples > 0) {
+		*out++ = *in++ << 16;
+		--num_samples;
+	}
+}
+
+static void
+pcm_convert_16_to_24(int32_t *out, const int16_t *in,
+		     unsigned num_samples)
+{
+	while (num_samples > 0) {
+		*out++ = *in++ << 8;
+		--num_samples;
+	}
+}
+
+const int32_t *
+pcm_convert_to_24(uint8_t bits, const void *src,
+		  size_t src_size, size_t *dest_size_r)
+{
+	static int32_t *buf;
+	static size_t len;
+	unsigned num_samples;
+
+	switch (bits) {
+	case 8:
+		num_samples = src_size;
+		*dest_size_r = src_size * 4;
+		if (*dest_size_r > len) {
+			len = *dest_size_r;
+			buf = g_realloc(buf, len);
+		}
+
+		pcm_convert_8_to_24(buf, (const int8_t *)src,
+				    num_samples);
+		return buf;
+
+	case 16:
+		num_samples = src_size / 2;
+		*dest_size_r = num_samples * 4;
+		if (*dest_size_r > len) {
+			len = *dest_size_r;
+			buf = g_realloc(buf, len);
+		}
+
+		pcm_convert_16_to_24(buf, (const int16_t *)src,
+				     num_samples);
+		return buf;
+
+	case 24:
+		*dest_size_r = src_size;
+		return src;
+	}
+
+	g_warning("only 8 or 24 bits are supported for conversion!\n");
+	return NULL;
+}