X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=wav.c;h=c03c21dc4db47ea51b44ab352570a5e7e0bc08cf;hb=refs%2Ftags%2Fv0.3.3;hp=5ab3bb3937385a855e7dd5fecdcc50635e3d1ac2;hpb=899a19c03fc05f6fd98687e3eaa86841a4633a10;p=paraslash.git

diff --git a/wav.c b/wav.c
index 5ab3bb39..c03c21dc 100644
--- a/wav.c
+++ b/wav.c
@@ -1,19 +1,7 @@
 /*
- * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.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, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file wav.c a filter that inserts a wave header */
@@ -25,18 +13,34 @@
 #include "filter.h"
 #include "string.h"
 
+/** size of the output buffer */
 #define WAV_OUTBUF_SIZE 81920
+/** a wav header is always 44 bytes */
 #define WAV_HEADER_LEN 44
+/** always write 16 bit header */
 #define BITS 16
 
-/* derived from oggdec.c of the vorbis-tools-1.0.1 package */
+/**
+ * write a 32 bit unsigned value to a buffer
+ *
+ * \param buf the buffer to write to
+ * \param x the value to write
+ */
 #define WRITE_U32(buf, x) (buf)[0] = (unsigned char)((x) & 0xff);\
 	(buf)[1] = (unsigned char)(((x) >> 8) & 0xff);\
 	(buf)[2] = (unsigned char)(((x) >> 16) & 0xff);\
 	(buf)[3] = (unsigned char)(((x) >> 24) & 0xff);
+
+/**
+ * write a 16 bit unsigned value to a buffer
+ *
+ * \param buf the buffer to write to
+ * \param x the value to write
+ */
 #define WRITE_U16(buf, x) (buf)[0] = (unsigned char)((x) & 0xff);
 
-static void make_wav_header(int channels, int samplerate, struct filter_node *fn)
+static void make_wav_header(unsigned int channels, unsigned int samplerate,
+		struct filter_node *fn)
 {
 
 	char *headbuf = fn->buf;
@@ -44,6 +48,7 @@ static void make_wav_header(int channels, int samplerate, struct filter_node *fn
 	int bytespersec = channels * samplerate * BITS / 8;
 	int align = channels * BITS / 8;
 
+	assert(channels);
 	PARA_DEBUG_LOG("writing wave header: %d channels, %d KHz\n", channels, samplerate);
 	memset(headbuf, 0, WAV_HEADER_LEN);
 	memcpy(headbuf, "RIFF", 4);
@@ -67,6 +72,8 @@ static ssize_t wav_convert(char *inbuf, size_t len, struct filter_node *fn)
 	int *bof = fn->private_data;
 
 	if (*bof) {
+		if (!len)
+			return 0;
 		make_wav_header(fn->fc->channels, fn->fc->samplerate, fn);
 		fn->loaded = WAV_HEADER_LEN;
 		*bof = 0;
@@ -95,11 +102,17 @@ static void wav_open(struct filter_node *fn)
 	fn->buf = para_malloc(fn->bufsize);
 	fn->private_data = para_malloc(sizeof(int));
 	bof = fn->private_data;
+	fn->loaded = 0;
 	*bof = 1;
 	PARA_INFO_LOG("wav filter node: %p, output buffer: %p, loaded: %zd\n",
 		fn, fn->buf, fn->loaded);
 }
 
+/**
+ * the init function of the wav filter
+ *
+ * \param f struct to initialize
+ */
 void wav_init(struct filter *f)
 {
 	f->convert = wav_convert;