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-rw-r--r--src/pcm_byteswap.c59
-rw-r--r--src/util/byte_reverse.c123
-rw-r--r--src/util/byte_reverse.h55
3 files changed, 199 insertions, 38 deletions
diff --git a/src/pcm_byteswap.c b/src/pcm_byteswap.c
index d56c3a87c..0a7e2fbb6 100644
--- a/src/pcm_byteswap.c
+++ b/src/pcm_byteswap.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * Copyright (C) 2003-2012 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@@ -20,14 +20,10 @@
#include "config.h"
#include "pcm_byteswap.h"
#include "pcm_buffer.h"
-
-#include <glib.h>
+#include "util/byte_reverse.h"
#include <assert.h>
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "pcm"
-
const int16_t *pcm_byteswap_16(struct pcm_buffer *buffer,
const int16_t *src, size_t len)
{
@@ -35,13 +31,10 @@ const int16_t *pcm_byteswap_16(struct pcm_buffer *buffer,
assert(buf != NULL);
- const int16_t *src_end = src + len / sizeof(*src);
- int16_t *dest = buf;
- while (src < src_end) {
- const int16_t x = *src++;
- *dest++ = GUINT16_SWAP_LE_BE(x);
- }
+ const uint8_t *src8 = (const uint8_t *)src;
+ const void *src_end = src8 + len;
+ reverse_bytes_16((uint16_t *)buf, (const uint16_t *)src, src_end);
return buf;
}
@@ -52,41 +45,31 @@ const int32_t *pcm_byteswap_32(struct pcm_buffer *buffer,
assert(buf != NULL);
- const int32_t *src_end = src + len / sizeof(*src);
- int32_t *dest = buf;
- while (src < src_end) {
- const int32_t x = *src++;
- *dest++ = GUINT32_SWAP_LE_BE(x);
- }
+ const uint8_t *src8 = (const uint8_t *)src;
+ const void *src_end = src8 + len;
+ reverse_bytes_32((uint32_t *)buf, (const uint32_t *)src, src_end);
return buf;
}
const void *
pcm_byteswap(struct pcm_buffer *buffer, enum sample_format format,
- const void *src, size_t size)
+ const void *_src, size_t size)
{
- switch (format) {
- case SAMPLE_FORMAT_UNDEFINED:
- case SAMPLE_FORMAT_S24:
- case SAMPLE_FORMAT_FLOAT:
- case SAMPLE_FORMAT_DSD_OVER_USB:
- /* not implemented */
- return NULL;
-
- case SAMPLE_FORMAT_S8:
- case SAMPLE_FORMAT_DSD:
+ const uint8_t *const src = _src;
+
+ if (size <= 1)
+ return src;
+
+ size_t sample_size = sample_format_size(format);
+ if (sample_size <= 1)
return src;
- case SAMPLE_FORMAT_S16:
- return pcm_byteswap_16(buffer, src, size);
+ assert(size % sample_size == 0);
- case SAMPLE_FORMAT_S24_P32:
- case SAMPLE_FORMAT_S32:
- return pcm_byteswap_32(buffer, src, size);
- }
+ uint8_t *dest = pcm_buffer_get(buffer, size);
+ assert(dest != NULL);
- /* unreachable */
- assert(false);
- return NULL;
+ reverse_bytes(dest, src, src + size, sample_size);
+ return dest;
}
diff --git a/src/util/byte_reverse.c b/src/util/byte_reverse.c
new file mode 100644
index 000000000..e96af14b9
--- /dev/null
+++ b/src/util/byte_reverse.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2003-2012 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "byte_reverse.h"
+
+#include <glib.h>
+#include <assert.h>
+
+void
+reverse_bytes_16(uint16_t *dest, const uint16_t *src, const uint16_t *src_end)
+{
+ assert(dest != NULL);
+ assert(src != NULL);
+ assert(src_end >= src);
+
+ while (src < src_end) {
+ const uint16_t x = *src++;
+ *dest++ = GUINT16_SWAP_LE_BE(x);
+ }
+}
+
+void
+reverse_bytes_32(uint32_t *dest, const uint32_t *src, const uint32_t *src_end)
+{
+ assert(dest != NULL);
+ assert(src != NULL);
+ assert(src_end >= src);
+
+ while (src < src_end) {
+ const uint32_t x = *src++;
+ *dest++ = GUINT32_SWAP_LE_BE(x);
+ }
+}
+
+void
+reverse_bytes_64(uint64_t *dest, const uint64_t *src, const uint64_t *src_end)
+{
+ assert(dest != NULL);
+ assert(src != NULL);
+ assert(src_end >= src);
+
+ while (src < src_end) {
+ const uint64_t x = *src++;
+ *dest++ = GUINT64_SWAP_LE_BE(x);
+ }
+}
+
+static void
+reverse_bytes_linear(uint8_t *dest, const uint8_t *src, size_t n)
+{
+ src += n;
+
+ while (n-- > 0)
+ *dest++ = *--src;
+}
+
+static void
+reverse_bytes_generic(uint8_t *dest,
+ const uint8_t *src, const uint8_t *src_end,
+ size_t frame_size)
+{
+ assert(dest != NULL);
+ assert(src != NULL);
+ assert(src_end >= src);
+ assert(frame_size > 0);
+ assert((src_end - src) % frame_size == 0);
+
+ while (src < src_end) {
+ reverse_bytes_linear(dest, src, frame_size);
+ dest += frame_size;
+ src += frame_size;
+ }
+}
+
+void
+reverse_bytes(uint8_t *dest, const uint8_t *src, const uint8_t *src_end,
+ size_t frame_size)
+{
+ assert(dest != NULL);
+ assert(src != NULL);
+ assert(src_end >= src);
+ assert(frame_size > 0);
+ assert((src_end - src) % frame_size == 0);
+
+ switch (frame_size) {
+ case 2:
+ reverse_bytes_16((uint16_t *)dest,
+ (const uint16_t *)src,
+ (const uint16_t *)src_end);
+ break;
+
+ case 4:
+ reverse_bytes_32((uint32_t *)dest,
+ (const uint32_t *)src,
+ (const uint32_t *)src_end);
+ break;
+
+ case 8:
+ reverse_bytes_64((uint64_t *)dest,
+ (const uint64_t *)src,
+ (const uint64_t *)src_end);
+ break;
+
+ default:
+ reverse_bytes_generic(dest, src, src_end, frame_size);
+ }
+}
diff --git a/src/util/byte_reverse.h b/src/util/byte_reverse.h
new file mode 100644
index 000000000..63213d6c2
--- /dev/null
+++ b/src/util/byte_reverse.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2003-2012 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_BYTE_REVERSE_H
+#define MPD_BYTE_REVERSE_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+/**
+ * Reverse the bytes in each 16 bit "frame". This function can be
+ * used for in-place operation.
+ */
+void
+reverse_bytes_16(uint16_t *dest, const uint16_t *src, const uint16_t *src_end);
+
+/**
+ * Reverse the bytes in each 32 bit "frame". This function can be
+ * used for in-place operation.
+ */
+void
+reverse_bytes_32(uint32_t *dest, const uint32_t *src, const uint32_t *src_end);
+
+/**
+ * Reverse the bytes in each 64 bit "frame". This function can be
+ * used for in-place operation.
+ */
+void
+reverse_bytes_64(uint64_t *dest, const uint64_t *src, const uint64_t *src_end);
+
+/**
+ * Reverse the bytes in each "frame". This function cannot be used
+ * for in-place operation.
+ */
+void
+reverse_bytes(uint8_t *dest, const uint8_t *src, const uint8_t *src_end,
+ size_t frame_size);
+
+#endif
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