/*****************************************************************************
- * ugly.c : linear interpolation resampler
+ * linear.c : linear interpolation resampler
*****************************************************************************
- * Copyright (C) 2002 VideoLAN
- * $Id: linear.c,v 1.2 2002/11/10 13:24:35 sigmunau Exp $
+ * Copyright (C) 2002, 2006 the VideoLAN team
+ * $Id$
*
- * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
+ * Authors: Gildas Bazin <gbazin@netcourrier.com>
+ * Sigmund Augdal Helberg <dnumgis@videolan.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
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include <errno.h>
-#include <stdlib.h> /* malloc(), free() */
-#include <string.h>
-#include <vlc/vlc.h>
-#include "audio_output.h"
-#include "aout_internal.h"
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_aout.h>
+#include <vlc_filter.h>
+#include <vlc_block.h>
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
-
+static void Close ( vlc_object_t * );
static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
aout_buffer_t * );
+static int OpenFilter ( vlc_object_t * );
+static void CloseFilter( vlc_object_t * );
+static block_t *Resample( filter_t *, block_t * );
+
+/*****************************************************************************
+ * Local structures
+ *****************************************************************************/
+struct filter_sys_t
+{
+ int32_t *p_prev_sample; /* this filter introduces a 1 sample delay */
+
+ unsigned int i_remainder; /* remainder of previous sample */
+
+ audio_date_t end_date;
+};
+
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
- set_description( _("audio filter for linear interpolation resampling") );
- set_capability( "audio filter", 10 );
- set_callbacks( Create, NULL );
+ set_description( N_("Audio filter for linear interpolation resampling") );
+ set_category( CAT_AUDIO );
+ set_subcategory( SUBCAT_AUDIO_MISC );
+ set_capability( "audio filter", 5 );
+ set_callbacks( Create, Close );
+
+ add_submodule();
+ set_description( N_("Audio filter for linear interpolation resampling") );
+ set_capability( "audio filter2", 5 );
+ set_callbacks( OpenFilter, CloseFilter );
vlc_module_end();
/*****************************************************************************
- * Create: allocate ugly resampler
+ * Create: allocate linear resampler
*****************************************************************************/
static int Create( vlc_object_t *p_this )
{
aout_filter_t * p_filter = (aout_filter_t *)p_this;
+ struct filter_sys_t * p_sys;
+
if ( p_filter->input.i_rate == p_filter->output.i_rate
|| p_filter->input.i_format != p_filter->output.i_format
- || p_filter->input.i_channels != p_filter->output.i_channels
+ || p_filter->input.i_physical_channels
+ != p_filter->output.i_physical_channels
+ || p_filter->input.i_original_channels
+ != p_filter->output.i_original_channels
|| p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
{
return VLC_EGENERIC;
}
+ /* Allocate the memory needed to store the module's structure */
+ p_sys = malloc( sizeof(filter_sys_t) );
+ p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
+ if( p_sys == NULL )
+ return VLC_ENOMEM;
+ p_sys->p_prev_sample = malloc(
+ p_filter->input.i_channels * sizeof(int32_t) );
+ if( p_sys->p_prev_sample == NULL )
+ return VLC_ENOMEM;
+ aout_DateInit( &p_sys->end_date, p_filter->output.i_rate );
+
p_filter->pf_do_work = DoWork;
- p_filter->b_in_place = VLC_FALSE;
+
+ /* We don't want a new buffer to be created because we're not sure we'll
+ * actually need to resample anything. */
+ p_filter->b_in_place = true;
return VLC_SUCCESS;
}
+/*****************************************************************************
+ * Close: free our resources
+ *****************************************************************************/
+static void Close( vlc_object_t * p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+ filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
+
+ free( p_sys->p_prev_sample );
+ free( p_sys );
+}
+
/*****************************************************************************
* DoWork: convert a buffer
*****************************************************************************/
static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
{
- float* p_in = (float*)p_in_buf->p_buffer;
- float* p_out = (float*)p_out_buf->p_buffer;
+ filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
+#ifndef HAVE_ALLOCA
+ float *p_in_orig;
+#endif
+ float *p_in, *p_out = (float *)p_out_buf->p_buffer;
+ float *p_prev_sample = (float *)p_sys->p_prev_sample;
- int i_nb_channels = aout_FormatNbChannels( &p_filter->input );
+ int i_nb_channels = p_filter->input.i_channels;
int i_in_nb = p_in_buf->i_nb_samples;
- int i_out_nb = i_in_nb * p_filter->output.i_rate
- / p_filter->input.i_rate;
- int i_frame_bytes = i_nb_channels * sizeof(s32);
- int i_in, i_chan, i_out = 0;
- double f_step = (float)p_filter->input.i_rate / p_filter->output.i_rate;
- float f_pos = 1;
-
- for( i_in = 0 ; i_in < i_in_nb - 1; i_in++ )
+ int i_chan, i_in, i_out = 0;
+
+ /* Check if we really need to run the resampler */
+ if( p_aout->mixer.mixer.i_rate == p_filter->input.i_rate )
{
- f_pos--;
- while( f_pos <= 1 )
+ if( p_filter->b_continuity &&
+ p_in_buf->i_size >=
+ p_in_buf->i_nb_bytes + sizeof(float) * i_nb_channels )
+ {
+ /* output the whole thing with the last sample from last time */
+ memmove( ((float *)(p_in_buf->p_buffer)) + i_nb_channels,
+ p_in_buf->p_buffer, p_in_buf->i_nb_bytes );
+ memcpy( p_in_buf->p_buffer, p_prev_sample,
+ i_nb_channels * sizeof(float) );
+ }
+ p_filter->b_continuity = false;
+ return;
+ }
+
+#ifdef HAVE_ALLOCA
+ p_in = (float *)alloca( p_in_buf->i_nb_bytes );
+#else
+ p_in_orig = p_in = (float *)malloc( p_in_buf->i_nb_bytes );
+#endif
+ if( p_in == NULL )
+ {
+ return;
+ }
+
+ vlc_memcpy( p_in, p_in_buf->p_buffer, p_in_buf->i_nb_bytes );
+
+ /* Take care of the previous input sample (if any) */
+ if( !p_filter->b_continuity )
+ {
+ p_filter->b_continuity = true;
+ p_sys->i_remainder = 0;
+ aout_DateInit( &p_sys->end_date, p_filter->output.i_rate );
+ }
+ else
+ {
+ while( p_sys->i_remainder < p_filter->output.i_rate )
+ {
+ for( i_chan = i_nb_channels ; i_chan ; )
+ {
+ i_chan--;
+ p_out[i_chan] = p_prev_sample[i_chan];
+ p_out[i_chan] += ( ( p_in[i_chan] - p_prev_sample[i_chan] )
+ * p_sys->i_remainder
+ / p_filter->output.i_rate );
+ }
+ p_out += i_nb_channels;
+ i_out++;
+
+ p_sys->i_remainder += p_filter->input.i_rate;
+ }
+ p_sys->i_remainder -= p_filter->output.i_rate;
+ }
+
+ /* Take care of the current input samples (minus last one) */
+ for( i_in = 0; i_in < i_in_nb - 1; i_in++ )
+ {
+ while( p_sys->i_remainder < p_filter->output.i_rate )
{
for( i_chan = i_nb_channels ; i_chan ; )
{
i_chan--;
- p_out[i_chan] = p_in[i_chan] +
- ( p_in[i_chan + i_nb_channels] - p_in[i_chan] ) * f_pos;
- i_out++;
+ p_out[i_chan] = p_in[i_chan];
+ p_out[i_chan] += ( ( p_in[i_chan + i_nb_channels]
+ - p_in[i_chan] )
+ * p_sys->i_remainder / p_filter->output.i_rate );
}
- f_pos += f_step;
p_out += i_nb_channels;
+ i_out++;
+
+ p_sys->i_remainder += p_filter->input.i_rate;
}
+
p_in += i_nb_channels;
+ p_sys->i_remainder -= p_filter->output.i_rate;
+ }
+
+ /* Backup the last input sample for next time */
+ for( i_chan = i_nb_channels ; i_chan ; )
+ {
+ i_chan--;
+ p_prev_sample[i_chan] = p_in[i_chan];
}
-
- if ( i_out != i_out_nb * i_nb_channels )
+
+ p_out_buf->i_nb_samples = i_out;
+ p_out_buf->start_date = p_in_buf->start_date;
+
+ if( p_in_buf->start_date !=
+ aout_DateGet( &p_sys->end_date ) )
{
- msg_Warn( p_aout, "mismatch in sample numbers: %d requested, "
- "%d generated", i_out_nb* i_nb_channels, i_out);
+ aout_DateSet( &p_sys->end_date, p_in_buf->start_date );
}
-
- p_out_buf->i_nb_samples = i_out_nb;
- p_out_buf->i_nb_bytes = i_out_nb * i_frame_bytes;
+
+ p_out_buf->end_date = aout_DateIncrement( &p_sys->end_date,
+ p_out_buf->i_nb_samples );
+
+ p_out_buf->i_nb_bytes = p_out_buf->i_nb_samples *
+ i_nb_channels * sizeof(int32_t);
+
+#ifndef HAVE_ALLOCA
+ free( p_in_orig );
+#endif
+
}
+/*****************************************************************************
+ * OpenFilter:
+ *****************************************************************************/
+static int OpenFilter( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+ filter_sys_t *p_sys;
+ int i_out_rate = p_filter->fmt_out.audio.i_rate;
+
+ if( p_filter->fmt_in.audio.i_rate == p_filter->fmt_out.audio.i_rate ||
+ p_filter->fmt_in.i_codec != VLC_FOURCC('f','l','3','2') )
+ {
+ return VLC_EGENERIC;
+ }
+
+ /* Allocate the memory needed to store the module's structure */
+ p_filter->p_sys = p_sys = malloc( sizeof(struct filter_sys_t) );
+ if( p_sys == NULL )
+ return VLC_ENOMEM;
+
+ p_sys->p_prev_sample = malloc(
+ p_filter->fmt_in.audio.i_channels * sizeof(int32_t) );
+ if( p_sys->p_prev_sample == NULL )
+ {
+ free( p_sys );
+ return VLC_ENOMEM;
+ }
+ aout_DateInit( &p_sys->end_date, p_filter->fmt_in.audio.i_rate );
+
+ p_filter->pf_audio_filter = Resample;
+
+ msg_Dbg( p_this, "%4.4s/%iKHz/%i->%4.4s/%iKHz/%i",
+ (char *)&p_filter->fmt_in.i_codec,
+ p_filter->fmt_in.audio.i_rate,
+ p_filter->fmt_in.audio.i_channels,
+ (char *)&p_filter->fmt_out.i_codec,
+ p_filter->fmt_out.audio.i_rate,
+ p_filter->fmt_out.audio.i_channels);
+
+ p_filter->fmt_out = p_filter->fmt_in;
+ p_filter->fmt_out.audio.i_rate = i_out_rate;
+
+ return 0;
+}
+
+/*****************************************************************************
+ * CloseFilter : deallocate data structures
+ *****************************************************************************/
+static void CloseFilter( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+ free( p_filter->p_sys->p_prev_sample );
+ free( p_filter->p_sys );
+}
+
+/*****************************************************************************
+ * Resample
+ *****************************************************************************/
+static block_t *Resample( filter_t *p_filter, block_t *p_block )
+{
+ aout_filter_t aout_filter;
+ aout_buffer_t in_buf, out_buf;
+ block_t *p_out;
+ int i_out_size;
+ int i_bytes_per_frame;
+
+ if( !p_block || !p_block->i_samples )
+ {
+ if( p_block ) p_block->pf_release( p_block );
+ return NULL;
+ }
+
+ i_bytes_per_frame = p_filter->fmt_out.audio.i_channels *
+ p_filter->fmt_out.audio.i_bitspersample / 8;
+
+ i_out_size = i_bytes_per_frame * ( 1 + (p_block->i_samples *
+ p_filter->fmt_out.audio.i_rate / p_filter->fmt_in.audio.i_rate));
+
+ p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
+ if( !p_out )
+ {
+ msg_Warn( p_filter, "can't get output buffer" );
+ p_block->pf_release( p_block );
+ return NULL;
+ }
+
+ p_out->i_samples = i_out_size / i_bytes_per_frame;
+ p_out->i_dts = p_block->i_dts;
+ p_out->i_pts = p_block->i_pts;
+ p_out->i_length = p_block->i_length;
+
+ aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
+ aout_filter.input = p_filter->fmt_in.audio;
+ aout_filter.output = p_filter->fmt_out.audio;
+ aout_filter.b_continuity = false;
+
+ in_buf.p_buffer = p_block->p_buffer;
+ in_buf.i_nb_bytes = p_block->i_buffer;
+ in_buf.i_nb_samples = p_block->i_samples;
+ out_buf.p_buffer = p_out->p_buffer;
+ out_buf.i_nb_bytes = p_out->i_buffer;
+ out_buf.i_nb_samples = p_out->i_samples;
+
+ DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
+
+ p_block->pf_release( p_block );
+
+ p_out->i_buffer = out_buf.i_nb_bytes;
+ p_out->i_samples = out_buf.i_nb_samples;
+
+ return p_out;
+}
projects / vlc / blobdiff