/*
- * 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 mp3dec.c paraslash's mp3 decoder */
+/** \file mp3dec.c Paraslash's mp3 decoder. */
#include "para.h"
#include "list.h"
#include <mad.h>
#include "string.h"
-/** the output buffer size */
-#define MP3_OUTBUF_SIZE 128 * 1024
+/** The output buffer size. */
+#define MP3_OUTBUF_SIZE (128 * 1024)
-/** \cond a helper macro */
-#define MAD_TO_SHORT(f) (f) >= MAD_F_ONE? SHRT_MAX :\
+/** Convert a sample value from libmad to a signed short. */
+#define MAD_TO_SHORT(f) (f) >= MAD_F_ONE? SHRT_MAX :\
(f) <= -MAD_F_ONE? -SHRT_MAX : (signed short) ((f) >> (MAD_F_FRACBITS - 15))
-/** \endcond */
-/**
- * data specific to the mp3dec filter
- *
- * \sa filter, filter_node
- */
+/** Data specific to the mp3dec filter. */
struct private_mp3dec_data {
- /** information on the current mp3 stream */
+ /** Information on the current mp3 stream. */
struct mad_stream stream;
- /** information about the frame which is currently decoded */
+ /** Information about the frame which is currently decoded. */
struct mad_frame frame;
- /** contains the PCM output */
+ /** Contains the PCM output. */
struct mad_synth synth;
};
-/* TODO: Convert all input if possible */
static ssize_t mp3dec(char *inbuffer, size_t len, struct filter_node *fn)
{
int i, ret;
mad_synth_frame(&pmd->synth, &pmd->frame);
for (i = 0; i < pmd->synth.pcm.length; i++) {
- /* output format: unsigned 16 bit little endian */
- signed short s = MAD_TO_SHORT(pmd->synth.pcm.samples[0][i]);
- fn->buf[fn->loaded++] = s & 0xff;
- fn->buf[fn->loaded++] = s >> 8;
+ int s = MAD_TO_SHORT(pmd->synth.pcm.samples[0][i]);
+ write_int16_host_endian(fn->buf + fn->loaded, s);
+ fn->loaded += 2;
if (MAD_NCHANNELS(&pmd->frame.header) == 2) { /* stereo */
s = MAD_TO_SHORT(pmd->synth.pcm.samples[1][i]);
- fn->buf[fn->loaded++] = s & 0xff;
- fn->buf[fn->loaded++] = s >> 8;
+ write_int16_host_endian(fn->buf + fn->loaded, s);
+ fn->loaded += 2;
}
if (fn->loaded != fn->bufsize) /* output buffer not full */
continue;
fn->bufsize = MP3_OUTBUF_SIZE;
fn->buf = para_calloc(fn->bufsize);
}
+
/**
- * the init function of the mp3dec filter
+ * The init function of the mp3dec filter.
+ *
+ * \param f Pointer to the filter struct to initialize.
*
- * \sa filter::init
+ * \sa filter::init.
*/
void mp3dec_init(struct filter *f)
{