--- /dev/null
+/*****************************************************************************
+ * headphone.c : headphone virtual spatialization channel mixer module
+ * -> gives the feeling of a real room with a simple headphone
+ *****************************************************************************
+ * Copyright (C) 2002 VideoLAN
+ * $Id: headphone.c,v 1.1 2002/12/09 00:52:42 babal Exp $
+ *
+ * Authors: Boris Dorès <babal@via.ecp.fr>
+ *
+ * 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.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h> /* malloc(), free() */
+#include <string.h>
+#include <math.h> /* sqrt */
+
+#include <vlc/vlc.h>
+#include "audio_output.h"
+#include "aout_internal.h"
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Create ( vlc_object_t * );
+static void Destroy ( vlc_object_t * );
+
+static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+ aout_buffer_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+ set_description( _("headphone channel mixer with virtual spatialization effect") );
+ set_capability( "audio filter", 0 );
+ set_callbacks( Create, Destroy );
+ add_shortcut( "headphone" );
+vlc_module_end();
+
+
+/*****************************************************************************
+ * Internal data structures
+ *****************************************************************************/
+struct atomic_operation_t
+{
+ int i_source_channel_offset;
+ int i_dest_channel_offset;
+ unsigned int i_delay;/* in sample unit */
+ double d_amplitude_factor;
+};
+
+struct aout_filter_sys_t
+{
+ size_t i_overflow_buffer_size;/* in bytes */
+ byte_t * p_overflow_buffer;
+ unsigned int i_nb_atomic_operations;
+ struct atomic_operation_t * p_atomic_operations;
+};
+
+/*****************************************************************************
+ * Init: initialize internal data structures
+ * and computes the needed atomic operations
+ *****************************************************************************/
+/* x and z represent the coordinates of the virtual speaker
+ * relatively to the center of the listener's head, measured in meters :
+ *
+ * left right
+ *Z
+ *-
+ *a head
+ *x
+ *i
+ *s
+ * rear left rear right
+ *
+ * x-axis
+ * */
+static void ComputeChannelOperations ( struct aout_filter_sys_t * p_data
+ , unsigned int i_rate , unsigned int i_next_atomic_operation
+ , int i_source_channel_offset , double d_x , double d_z
+ , double d_channel_amplitude_factor )
+{
+ double d_c = 340; /*sound celerity (unit: m/s)*/
+
+ /* Left ear */
+ p_data->p_atomic_operations[i_next_atomic_operation]
+ .i_source_channel_offset = i_source_channel_offset;
+ p_data->p_atomic_operations[i_next_atomic_operation]
+ .i_dest_channel_offset = 0;/* left */
+ p_data->p_atomic_operations[i_next_atomic_operation]
+ .i_delay = (int)( sqrt( (-0.1-d_x)*(-0.1-d_x) + (0-d_z)*(0-d_z) )
+ / d_c * i_rate );
+ if ( d_x < 0 )
+ {
+ p_data->p_atomic_operations[i_next_atomic_operation]
+ .d_amplitude_factor = d_channel_amplitude_factor * 1.1 / 2;
+ }
+ else if ( d_x > 0 )
+ {
+ p_data->p_atomic_operations[i_next_atomic_operation]
+ .d_amplitude_factor = d_channel_amplitude_factor * 0.9 / 2;
+ }
+ else
+ {
+ p_data->p_atomic_operations[i_next_atomic_operation]
+ .d_amplitude_factor = d_channel_amplitude_factor / 2;
+ }
+
+ /* Right ear */
+ p_data->p_atomic_operations[i_next_atomic_operation + 1]
+ .i_source_channel_offset = i_source_channel_offset;
+ p_data->p_atomic_operations[i_next_atomic_operation + 1]
+ .i_dest_channel_offset = 1;/* right */
+ p_data->p_atomic_operations[i_next_atomic_operation + 1]
+ .i_delay = (int)( sqrt( (0.1-d_x)*(0.1-d_x) + (0-d_z)*(0-d_z) )
+ / d_c * i_rate );
+ if ( d_x < 0 )
+ {
+ p_data->p_atomic_operations[i_next_atomic_operation + 1]
+ .d_amplitude_factor = d_channel_amplitude_factor * 0.9 / 2;
+ }
+ else if ( d_x > 0 )
+ {
+ p_data->p_atomic_operations[i_next_atomic_operation + 1]
+ .d_amplitude_factor = d_channel_amplitude_factor * 1.1 / 2;
+ }
+ else
+ {
+ p_data->p_atomic_operations[i_next_atomic_operation + 1]
+ .d_amplitude_factor = d_channel_amplitude_factor / 2;
+ }
+}
+
+static int Init ( aout_filter_t * p_filter , struct aout_filter_sys_t * p_data
+ , unsigned int i_nb_channels , uint32_t i_physical_channels
+ , unsigned int i_rate )
+{
+ double d_x = config_GetInt ( p_filter , "headphone-dim" );
+ double d_z = d_x;
+ double d_z_rear = -d_x/3;
+ unsigned int i_next_atomic_operation;
+ int i_source_channel_offset;
+ unsigned int i;
+
+ if ( p_data == NULL )
+ {
+ msg_Dbg ( p_filter, "passing a null pointer as argument" );
+ return 0;
+ }
+
+ /* Number of elementary operations */
+ p_data->i_nb_atomic_operations = i_nb_channels * 2;
+ p_data->p_atomic_operations = malloc ( sizeof(struct atomic_operation_t)
+ * p_data->i_nb_atomic_operations );
+ if ( p_data->p_atomic_operations == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return -1;
+ }
+
+ /* For each virtual speaker, computes elementary wave propagation time
+ * to each ear */
+ i_next_atomic_operation = 0;
+ i_source_channel_offset = 0;
+ if ( i_physical_channels & AOUT_CHAN_LEFT )
+ {
+ ComputeChannelOperations ( p_data , i_rate
+ , i_next_atomic_operation , i_source_channel_offset
+ , -d_x , d_z , 2.0 / i_nb_channels );
+ i_next_atomic_operation += 2;
+ i_source_channel_offset++;
+ }
+ if ( i_physical_channels & AOUT_CHAN_RIGHT )
+ {
+ ComputeChannelOperations ( p_data , i_rate
+ , i_next_atomic_operation , i_source_channel_offset
+ , d_x , d_z , 2.0 / i_nb_channels );
+ i_next_atomic_operation += 2;
+ i_source_channel_offset++;
+ }
+ if ( i_physical_channels & AOUT_CHAN_REARLEFT )
+ {
+ ComputeChannelOperations ( p_data , i_rate
+ , i_next_atomic_operation , i_source_channel_offset
+ , -d_x , d_z_rear , 1.5 / i_nb_channels );
+ i_next_atomic_operation += 2;
+ i_source_channel_offset++;
+ }
+ if ( i_physical_channels & AOUT_CHAN_REARRIGHT )
+ {
+ ComputeChannelOperations ( p_data , i_rate
+ , i_next_atomic_operation , i_source_channel_offset
+ , d_x , d_z_rear , 1.5 / i_nb_channels );
+ i_next_atomic_operation += 2;
+ i_source_channel_offset++;
+ }
+ if ( i_physical_channels & AOUT_CHAN_CENTER )
+ {
+ ComputeChannelOperations ( p_data , i_rate
+ , i_next_atomic_operation , i_source_channel_offset
+ , 0 , d_z , 1.5 / i_nb_channels );
+ i_next_atomic_operation += 2;
+ i_source_channel_offset++;
+ }
+ if ( i_physical_channels & AOUT_CHAN_LFE )
+ {
+ ComputeChannelOperations ( p_data , i_rate
+ , i_next_atomic_operation , i_source_channel_offset
+ , 0 , d_z_rear , 5.0 / i_nb_channels );
+ i_next_atomic_operation += 2;
+ i_source_channel_offset++;
+ }
+
+ /* Initialize the overflow buffer
+ * we need it because the process induce a delay in the samples */
+ p_data->i_overflow_buffer_size = 0;
+ for ( i = 0 ; i < p_data->i_nb_atomic_operations ; i++ )
+ {
+ if ( p_data->i_overflow_buffer_size
+ < p_data->p_atomic_operations[i].i_delay * i_nb_channels
+ * sizeof (float) )
+ {
+ p_data->i_overflow_buffer_size
+ = p_data->p_atomic_operations[i].i_delay * i_nb_channels
+ * sizeof (float);
+ }
+ }
+ p_data->p_overflow_buffer = malloc ( p_data->i_overflow_buffer_size );
+ if ( p_data->p_atomic_operations == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return -1;
+ }
+ memset ( p_data->p_overflow_buffer , 0 , p_data->i_overflow_buffer_size );
+
+ /* end */
+ return 0;
+}
+
+/*****************************************************************************
+ * Create: allocate headphone downmixer
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if ( p_filter->output.i_physical_channels != ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT )
+ || p_filter->input.i_format != p_filter->output.i_format
+ || p_filter->input.i_rate != p_filter->output.i_rate
+ || (p_filter->input.i_format != VLC_FOURCC('f','l','3','2')
+ && p_filter->input.i_format != VLC_FOURCC('f','i','3','2')) )
+ {
+ return -1;
+ }
+
+ /* Allocate the memory needed to store the module's structure */
+ p_filter->p_sys = malloc( sizeof(struct aout_filter_sys_t) );
+ if ( p_filter->p_sys == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return -1;
+ }
+ p_filter->p_sys->i_overflow_buffer_size = 0;
+ p_filter->p_sys->p_overflow_buffer = NULL;
+ p_filter->p_sys->i_nb_atomic_operations = 0;
+ p_filter->p_sys->p_atomic_operations = NULL;
+
+ if ( Init( p_filter , p_filter->p_sys
+ , aout_FormatNbChannels ( &p_filter->input )
+ , p_filter->input.i_physical_channels
+ , p_filter->input.i_rate ) < 0 )
+ {
+ return -1;
+ }
+
+ p_filter->pf_do_work = DoWork;
+ p_filter->b_in_place = 0;
+
+ return 0;
+}
+
+/*****************************************************************************
+ * Destroy: deallocate resources associated with headphone downmixer
+ *****************************************************************************/
+static void Destroy( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if ( p_filter->p_sys != NULL )
+ {
+ if ( p_filter->p_sys->p_overflow_buffer != NULL )
+ {
+ free ( p_filter->p_sys->p_overflow_buffer );
+ }
+ if ( p_filter->p_sys->p_atomic_operations != NULL )
+ {
+ free ( p_filter->p_sys->p_atomic_operations );
+ }
+ free ( p_filter->p_sys );
+ p_filter->p_sys = NULL;
+ }
+}
+
+/*****************************************************************************
+ * 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 )
+{
+ int i_input_nb = aout_FormatNbChannels( &p_filter->input );
+ int i_output_nb = aout_FormatNbChannels( &p_filter->output );
+
+ float * p_in = (float*) p_in_buf->p_buffer;
+ byte_t * p_out;
+ byte_t * p_overflow;
+ byte_t * p_slide;
+
+ size_t i_overflow_size;/* in bytes */
+ size_t i_out_size;/* in bytes */
+
+ unsigned int i, j;
+
+ int i_source_channel_offset;
+ int i_dest_channel_offset;
+ unsigned int i_delay;
+ double d_amplitude_factor;
+
+
+ /* out buffer characterisitcs */
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
+ p_out = p_out_buf->p_buffer;
+ i_out_size = p_out_buf->i_nb_bytes;
+
+ if ( p_filter->p_sys != NULL )
+ {
+ /* Slide the overflow buffer */
+ p_overflow = p_filter->p_sys->p_overflow_buffer;
+ i_overflow_size = p_filter->p_sys->i_overflow_buffer_size;
+
+ memset ( p_out , 0 , i_out_size );
+ if ( i_out_size > i_overflow_size )
+ memcpy ( p_out , p_overflow , i_overflow_size );
+ else
+ memcpy ( p_out , p_overflow , i_out_size );
+
+ p_slide = p_filter->p_sys->p_overflow_buffer;
+ while ( p_slide < p_overflow + i_overflow_size )
+ {
+ if ( p_slide + i_out_size < p_overflow + i_overflow_size )
+ {
+ memset ( p_slide , 0 , i_out_size );
+ if ( p_slide + 2 * i_out_size < p_overflow + i_overflow_size )
+ memcpy ( p_slide , p_slide + i_out_size , i_out_size );
+ else
+ memcpy ( p_slide , p_slide + i_out_size
+ , p_overflow + i_overflow_size - ( p_slide + i_out_size ) );
+ }
+ else
+ {
+ memset ( p_slide , 0 , p_overflow + i_overflow_size - p_slide );
+ }
+ p_slide += i_out_size;
+ }
+
+ /* apply the atomic operations */
+ for ( i = 0 ; i < p_filter->p_sys->i_nb_atomic_operations ; i++ )
+ {
+ /* shorter variable names */
+ i_source_channel_offset
+ = p_filter->p_sys->p_atomic_operations[i].i_source_channel_offset;
+ i_dest_channel_offset
+ = p_filter->p_sys->p_atomic_operations[i].i_dest_channel_offset;
+ i_delay = p_filter->p_sys->p_atomic_operations[i].i_delay;
+ d_amplitude_factor
+ = p_filter->p_sys->p_atomic_operations[i].d_amplitude_factor;
+
+ if ( p_out_buf->i_nb_samples > i_delay )
+ {
+ /* current buffer coefficients */
+ for ( j = 0 ; j < p_out_buf->i_nb_samples - i_delay ; j++ )
+ {
+ ((float*)p_out)[ (i_delay+j)*i_output_nb + i_dest_channel_offset ]
+ += p_in[ j * i_input_nb + i_source_channel_offset ]
+ * d_amplitude_factor;
+ }
+
+ /* overflow buffer coefficients */
+ for ( j = 0 ; j < i_delay ; j++ )
+ {
+ ((float*)p_overflow)[ j*i_output_nb + i_dest_channel_offset ]
+ += p_in[ (p_out_buf->i_nb_samples - i_delay + j)
+ * i_input_nb + i_source_channel_offset ]
+ * d_amplitude_factor;
+ }
+ }
+ else
+ {
+ /* overflow buffer coefficients only */
+ for ( j = 0 ; j < p_out_buf->i_nb_samples ; j++ )
+ {
+ ((float*)p_overflow)[ (i_delay - p_out_buf->i_nb_samples + j)
+ * i_output_nb + i_dest_channel_offset ]
+ += p_in[ j * i_input_nb + i_source_channel_offset ]
+ * d_amplitude_factor;
+ }
+ }
+ }
+ }
+ else
+ {
+ memset ( p_out , 0 , i_out_size );
+ }
+}
* input.c : internal management of input streams for the audio output
*****************************************************************************
* Copyright (C) 2002 VideoLAN
- * $Id: input.c,v 1.26 2002/12/06 10:10:39 sam Exp $
+ * $Id: input.c,v 1.27 2002/12/09 00:52:42 babal Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
*****************************************************************************/
int aout_InputNew( aout_instance_t * p_aout, aout_input_t * p_input )
{
- audio_sample_format_t intermediate_format;
+ audio_sample_format_t intermediate_format, headphone_intermediate_format;
+ aout_filter_t * p_headphone_filter;
aout_FormatPrint( p_aout, "input", &p_input->input );
/* Create filters. */
memcpy( &intermediate_format, &p_aout->mixer.mixer,
sizeof(audio_sample_format_t) );
+ memcpy( &headphone_intermediate_format, &p_aout->mixer.mixer,
+ sizeof(audio_sample_format_t) );
+ if ( config_GetInt( p_aout , "headphone" ) )
+ {
+ headphone_intermediate_format.i_physical_channels = p_input->input.i_physical_channels;
+ headphone_intermediate_format.i_original_channels = p_input->input.i_original_channels;
+ headphone_intermediate_format.i_bytes_per_frame =
+ headphone_intermediate_format.i_bytes_per_frame
+ * aout_FormatNbChannels( &headphone_intermediate_format )
+ / aout_FormatNbChannels( &intermediate_format );
+ }
+
intermediate_format.i_rate = p_input->input.i_rate;
+ headphone_intermediate_format.i_rate = p_input->input.i_rate;
if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_filters,
&p_input->i_nb_filters, &p_input->input,
- &intermediate_format ) < 0 )
+ &headphone_intermediate_format ) < 0 )
{
msg_Err( p_aout, "couldn't set an input pipeline" );
return -1;
}
+ if ( config_GetInt( p_aout , "headphone" ) )
+ {
+ /* create a vlc object */
+ p_headphone_filter = vlc_object_create( p_aout
+ , sizeof(aout_filter_t) );
+ if ( p_headphone_filter == NULL )
+ {
+ msg_Err( p_aout, "couldn't open the headphone virtual spatialization module" );
+ aout_FifoDestroy( p_aout, &p_input->fifo );
+ p_input->b_error = 1;
+ return -1;
+ }
+ vlc_object_attach( p_headphone_filter, p_aout );
+
+ /* find the headphone filter */
+ memcpy( &p_headphone_filter->input, &headphone_intermediate_format
+ , sizeof(audio_sample_format_t) );
+ memcpy( &p_headphone_filter->output, &intermediate_format
+ , sizeof(audio_sample_format_t) );
+ p_headphone_filter->p_module = module_Need( p_headphone_filter, "audio filter"
+ , "headphone" );
+ if ( p_headphone_filter->p_module == NULL )
+ {
+ vlc_object_detach( p_headphone_filter );
+ vlc_object_destroy( p_headphone_filter );
+
+ msg_Err( p_aout, "couldn't open the headphone virtual spatialization module" );
+ aout_FifoDestroy( p_aout, &p_input->fifo );
+ p_input->b_error = 1;
+ return -1;
+ }
+
+ /* success */
+ p_headphone_filter->b_reinit = VLC_TRUE;
+ p_input->pp_filters[p_input->i_nb_filters++] = p_headphone_filter;
+ }
+
/* Prepare hints for the buffer allocator. */
p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
p_input->input_alloc.i_bytes_per_sec = -1;
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