--- /dev/null
+/*****************************************************************************
+ * fixed.c: Fixed-point audio format conversions
+ *****************************************************************************
+ * Copyright (C) 2002, 2006 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
+ * Marc Ariberti <marcari@videolan.org>
+ * Samuel Hocevar <sam@zoy.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.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_aout.h>
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Create_F32ToS16 ( vlc_object_t * );
+static void Do_F32ToS16( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+
+static int Create_S16ToF32 ( vlc_object_t * );
+static void Do_S16ToF32( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+
+static int Create_U8ToF32 ( vlc_object_t * );
+static void Do_U8ToF32( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin ()
+ set_description( N_("Fixed point audio format conversions") )
+ add_submodule ()
+ set_callbacks( Create_F32ToS16, NULL )
+ set_capability( "audio filter", 10 )
+ add_submodule ()
+ set_callbacks( Create_S16ToF32, NULL )
+ set_capability( "audio filter", 15 )
+ add_submodule ()
+ set_callbacks( Create_U8ToF32, NULL )
+ set_capability( "audio filter", 1 )
+vlc_module_end ()
+
+/*****************************************************************************
+ * F32 to S16
+ *****************************************************************************/
+static int Create_F32ToS16( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FI32
+ || p_filter->fmt_out.audio.i_format != VLC_CODEC_S16N )
+ {
+ return -1;
+ }
+
+ if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
+ {
+ return -1;
+ }
+
+ p_filter->pf_do_work = Do_F32ToS16;
+ p_filter->b_in_place = 1;
+
+ return VLC_SUCCESS;;
+}
+
+/*****************************************************************************
+ * support routines borrowed from mpg321 (file: mad.c), which is distributed
+ * under GPL license
+ *
+ * mpg321 was written by Joe Drew <drew@debian.org>, and based upon 'plaympeg'
+ * from the smpeg sources, which was written by various people from Loki Software
+ * (http://www.lokigames.com).
+ *
+ * It also incorporates some source from mad, written by Robert Leslie
+ *****************************************************************************/
+
+/* The following two routines and data structure are from the ever-brilliant
+ Rob Leslie.
+*/
+
+#define VLC_F_FRACBITS 28
+
+# if VLC_F_FRACBITS == 28
+# define VLC_F(x) ((vlc_fixed_t) (x##L))
+# endif
+
+# define VLC_F_ONE VLC_F(0x10000000)
+
+/*****************************************************************************
+ * s24_to_s16_pcm: Scale a 24 bit pcm sample to a 16 bit pcm sample.
+ *****************************************************************************/
+static inline int16_t s24_to_s16_pcm(vlc_fixed_t sample)
+{
+ /* round */
+ sample += (1L << (VLC_F_FRACBITS - 16));
+
+ /* clip */
+ if (sample >= VLC_F_ONE)
+ sample = VLC_F_ONE - 1;
+ else if (sample < -VLC_F_ONE)
+ sample = -VLC_F_ONE;
+
+ /* quantize */
+ return (sample >> (VLC_F_FRACBITS + 1 - 16));
+}
+
+static void Do_F32ToS16( aout_instance_t * p_aout, aout_filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+ VLC_UNUSED(p_aout);
+ int i;
+ vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
+ int16_t * p_out = (int16_t *)p_out_buf->p_buffer;
+
+ for ( i = p_in_buf->i_nb_samples
+ * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
+ {
+ /* Fast Scaling */
+ *p_out++ = s24_to_s16_pcm(*p_in++);
+ }
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_buffer = p_in_buf->i_buffer / 2;
+}
+
+
+/*****************************************************************************
+ * S16 to F32
+ *****************************************************************************/
+static int Create_S16ToF32( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if ( p_filter->fmt_out.audio.i_format != VLC_CODEC_FI32
+ || p_filter->fmt_in.audio.i_format != VLC_CODEC_S16N )
+ {
+ return -1;
+ }
+
+ if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
+ {
+ return -1;
+ }
+
+ p_filter->pf_do_work = Do_S16ToF32;
+ p_filter->b_in_place = 1;
+
+ return 0;
+}
+
+static void Do_S16ToF32( aout_instance_t * p_aout, aout_filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+ VLC_UNUSED(p_aout);
+ int i = p_in_buf->i_nb_samples * aout_FormatNbChannels( &p_filter->fmt_in.audio );
+
+ /* We start from the end because b_in_place is true */
+ int16_t * p_in = (int16_t *)p_in_buf->p_buffer + i - 1;
+ vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer + i - 1;
+
+ while( i-- )
+ {
+ *p_out = (vlc_fixed_t)( (int32_t)(*p_in) * (FIXED32_ONE >> 16) );
+ p_in--; p_out--;
+ }
+
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_buffer = p_in_buf->i_buffer
+ * sizeof(vlc_fixed_t) / sizeof(int16_t);
+}
+
+
+/*****************************************************************************
+ * U8 to F32
+ *****************************************************************************/
+static int Create_U8ToF32( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if ( p_filter->fmt_in.audio.i_format != VLC_CODEC_U8
+ || p_filter->fmt_out.audio.i_format != VLC_CODEC_FI32 )
+ {
+ return -1;
+ }
+
+ if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
+ {
+ return -1;
+ }
+
+ p_filter->pf_do_work = Do_U8ToF32;
+ p_filter->b_in_place = true;
+
+ return 0;
+}
+
+static void Do_U8ToF32( aout_instance_t * p_aout, aout_filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+ VLC_UNUSED(p_aout);
+ int i = p_in_buf->i_nb_samples * aout_FormatNbChannels( &p_filter->fmt_in.audio );
+
+ /* We start from the end because b_in_place is true */
+ uint8_t * p_in = (uint8_t *)p_in_buf->p_buffer + i - 1;
+ vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer + i - 1;
+
+ while( i-- )
+ {
+ *p_out = (vlc_fixed_t)( (int32_t)(*p_in - 128) * (FIXED32_ONE / 128) );
+ p_in--; p_out--;
+ }
+
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_buffer = p_in_buf->i_buffer * sizeof(vlc_fixed_t);
+}
--- /dev/null
+/*****************************************************************************
+ * float.c: Floating point audio format conversions
+ *****************************************************************************
+ * Copyright (C) 2002, 2006 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
+ * Christophe Massiot <massiot@via.ecp.fr>
+ * Samuel Hocevar <sam@zoy.org>
+ * Xavier Maillard <zedek@fxgsproject.org>
+ * Henri Fallon <henri@videolan.org>
+ * Gildas Bazin <gbazin@netcourrier.com>
+ *
+ * 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.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include <vlc_aout.h>
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Create_F32ToFL32 ( vlc_object_t * );
+static void Do_F32ToFL32( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+static void Do_FL32ToF32 ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin ()
+ set_description( N_("Floating-point audio format conversions") )
+ add_submodule ()
+ set_capability( "audio filter", 10 )
+ set_callbacks( Create_F32ToFL32, NULL )
+vlc_module_end ()
+
+/*****************************************************************************
+ * Fixed 32 to Float 32 and backwards
+ *****************************************************************************/
+static int Create_F32ToFL32( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if( ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FI32
+ || p_filter->fmt_out.audio.i_format != VLC_CODEC_FL32 )
+ && ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FL32
+ || p_filter->fmt_out.audio.i_format != VLC_CODEC_FI32 ) )
+ {
+ return -1;
+ }
+
+ if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
+ {
+ return -1;
+ }
+
+ if( p_filter->fmt_in.audio.i_format == VLC_CODEC_FI32 )
+ {
+ p_filter->pf_do_work = Do_F32ToFL32;
+ }
+ else
+ {
+ p_filter->pf_do_work = Do_FL32ToF32;
+ }
+
+ p_filter->b_in_place = 1;
+
+ return 0;
+}
+
+static void Do_F32ToFL32( aout_instance_t * p_aout, aout_filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+ VLC_UNUSED(p_aout);
+ int i;
+ vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
+ float * p_out = (float *)p_out_buf->p_buffer;
+
+ for ( i = p_in_buf->i_nb_samples
+ * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
+ {
+ *p_out++ = (float)*p_in++ / (float)FIXED32_ONE;
+ }
+
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_buffer = p_in_buf->i_buffer;
+}
+
+static void Do_FL32ToF32( aout_instance_t * p_aout, aout_filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+ VLC_UNUSED(p_aout);
+ int i;
+ float * p_in = (float *)p_in_buf->p_buffer;
+ vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer;
+
+ for ( i = p_in_buf->i_nb_samples
+ * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
+ {
+ *p_out++ = (vlc_fixed_t)( *p_in++ * (float)FIXED32_ONE );
+ }
+
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_buffer = p_in_buf->i_buffer;
+}