/*****************************************************************************
* mixer.c : audio output mixing operations
*****************************************************************************
- * Copyright (C) 2002 VideoLAN
- * $Id: mixer.c,v 1.7 2002/08/19 21:54:37 massiot Exp $
+ * Copyright (C) 2002-2004 the VideoLAN team
+ * $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* 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 <stdlib.h> /* calloc(), malloc(), free() */
-#include <string.h>
-
-#include <vlc/vlc.h>
-
-#ifdef HAVE_ALLOCA_H
-# include <alloca.h>
+#ifdef HAVE_CONFIG_H
+# include "config.h"
#endif
+#include <assert.h>
-#include "audio_output.h"
-#include "aout_internal.h"
+#include <stddef.h>
+#include <vlc_common.h>
+#include <libvlc.h>
+#include <vlc_modules.h>
+#include <vlc_aout.h>
+#include "aout_internal.h"
/*****************************************************************************
* aout_MixerNew: prepare a mixer plug-in
+ *****************************************************************************
+ * Please note that you must hold the mixer lock.
*****************************************************************************/
int aout_MixerNew( aout_instance_t * p_aout )
{
- p_aout->mixer.p_module = module_Need( p_aout, "audio mixer", NULL );
- if ( p_aout->mixer.p_module == NULL )
+ assert( !p_aout->p_mixer );
+ vlc_assert_locked( &p_aout->input_fifos_lock );
+
+ aout_mixer_t *p_mixer = vlc_object_create( p_aout, sizeof(*p_mixer) );
+ if( !p_mixer )
+ return VLC_EGENERIC;
+
+ p_mixer->fmt = p_aout->mixer_format;
+ p_mixer->allocation = p_aout->mixer_allocation;
+ p_mixer->multiplier = p_aout->mixer_multiplier;
+ p_mixer->input_count = p_aout->i_nb_inputs;
+ p_mixer->input = calloc( p_mixer->input_count, sizeof(*p_mixer->input) );
+ for( int i = 0; i < p_aout->i_nb_inputs; i++ )
+ p_mixer->input[i] = &p_aout->pp_inputs[i]->mixer;
+ p_mixer->mix = NULL;
+ p_mixer->sys = NULL;
+
+ vlc_object_attach( p_mixer, p_aout );
+
+ p_mixer->module = module_need( p_mixer, "audio mixer", NULL, false );
+ if( !p_mixer->module )
{
- msg_Err( p_aout, "no suitable aout mixer" );
- return -1;
+ msg_Err( p_aout, "no suitable audio mixer" );
+ free( p_mixer->input );
+ vlc_object_release( p_mixer );
+ return VLC_EGENERIC;
}
- return 0;
+
+ /* */
+ p_aout->p_mixer = p_mixer;
+ return VLC_SUCCESS;
}
/*****************************************************************************
* aout_MixerDelete: delete the mixer
+ *****************************************************************************
+ * Please note that you must hold the mixer lock.
*****************************************************************************/
void aout_MixerDelete( aout_instance_t * p_aout )
{
- module_Unneed( p_aout, p_aout->mixer.p_module );
+ if( !p_aout->p_mixer )
+ return;
+
+ module_unneed( p_aout->p_mixer, p_aout->p_mixer->module );
+
+ free( p_aout->p_mixer->input );
+ vlc_object_release( p_aout->p_mixer );
+
+ /* */
+ p_aout->p_mixer = NULL;
}
/*****************************************************************************
- * aout_MixerRun: entry point for the mixer & post-filters processing
+ * MixBuffer: try to prepare one output buffer
+ *****************************************************************************
+ * Please note that you must hold the mixer lock.
*****************************************************************************/
-void aout_MixerRun( aout_instance_t * p_aout )
+static int MixBuffer( aout_instance_t * p_aout )
{
- int i;
+ int i, i_first_input = 0;
aout_buffer_t * p_output_buffer;
mtime_t start_date, end_date;
+ date_t exact_start_date;
+
+ if( !p_aout->p_mixer )
+ {
+ /* Free all incoming buffers. */
+ aout_lock_input_fifos( p_aout );
+ for ( i = 0; i < p_aout->i_nb_inputs; i++ )
+ {
+ aout_input_t * p_input = p_aout->pp_inputs[i];
+ aout_buffer_t * p_buffer = p_input->mixer.fifo.p_first;
+ if ( p_input->b_error ) continue;
+ while ( p_buffer != NULL )
+ {
+ aout_buffer_t * p_next = p_buffer->p_next;
+ aout_BufferFree( p_buffer );
+ p_buffer = p_next;
+ }
+ }
+ aout_unlock_input_fifos( p_aout );
+ return -1;
+ }
+
+
+ aout_lock_input_fifos( p_aout );
+ aout_lock_output_fifo( p_aout );
+
+ /* Retrieve the date of the next buffer. */
+ exact_start_date = p_aout->output.fifo.end_date;
+ start_date = date_Get( &exact_start_date );
- /* Retrieve the date of the next buffer. We don't use aout_FifoNextStart
- * because we need to keep the lock on the FIFO, to prevent the aout
- * thread from triggering resampling while we are running. */
- vlc_mutex_lock( &p_aout->output.fifo.lock );
- start_date = p_aout->output.fifo.end_date;
if ( start_date != 0 && start_date < mdate() )
{
/* The output is _very_ late. This can only happen if the user
* pauses the stream (or if the decoder is buggy, which cannot
* happen :). */
- msg_Warn( p_aout, "Output PTS is out of range (%lld), clearing out",
- start_date );
- start_date = p_aout->output.fifo.end_date = 0;
- }
- end_date = start_date + (mtime_t)p_aout->output.i_nb_samples * 1000000
- / p_aout->output.output.i_rate;
+ msg_Warn( p_aout, "output PTS is out of range (%"PRId64"), clearing out",
+ mdate() - start_date );
+ aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
+ date_Set( &exact_start_date, 0 );
+ start_date = 0;
+ }
+
+ aout_unlock_output_fifo( p_aout );
/* See if we have enough data to prepare a new buffer for the audio
- * output. */
+ * output. First : start date. */
+ if ( !start_date )
+ {
+ /* Find the latest start date available. */
+ for ( i = 0; i < p_aout->i_nb_inputs; i++ )
+ {
+ aout_input_t * p_input = p_aout->pp_inputs[i];
+ aout_fifo_t * p_fifo = &p_input->mixer.fifo;
+ aout_buffer_t * p_buffer;
+
+ if ( p_input->b_error || p_input->b_paused )
+ continue;
+
+ p_buffer = p_fifo->p_first;
+ while ( p_buffer != NULL && p_buffer->i_pts < mdate() )
+ {
+ msg_Warn( p_aout, "input PTS is out of range (%"PRId64"), "
+ "trashing", mdate() - p_buffer->i_pts );
+ p_buffer = aout_FifoPop( p_aout, p_fifo );
+ aout_BufferFree( p_buffer );
+ p_buffer = p_fifo->p_first;
+ p_input->mixer.begin = NULL;
+ }
+
+ if ( p_buffer == NULL )
+ {
+ break;
+ }
+
+ if ( !start_date || start_date < p_buffer->i_pts )
+ {
+ date_Set( &exact_start_date, p_buffer->i_pts );
+ start_date = p_buffer->i_pts;
+ }
+ }
+
+ if ( i < p_aout->i_nb_inputs )
+ {
+ /* Interrupted before the end... We can't run. */
+ aout_unlock_input_fifos( p_aout );
+ return -1;
+ }
+ }
+ date_Increment( &exact_start_date, p_aout->output.i_nb_samples );
+ end_date = date_Get( &exact_start_date );
+
+ /* Check that start_date and end_date are available for all input
+ * streams. */
for ( i = 0; i < p_aout->i_nb_inputs; i++ )
{
aout_input_t * p_input = p_aout->pp_inputs[i];
- aout_fifo_t * p_fifo = &p_input->fifo;
+ aout_fifo_t * p_fifo = &p_input->mixer.fifo;
aout_buffer_t * p_buffer;
mtime_t prev_date;
- vlc_bool_t b_drop_buffers;
+ bool b_drop_buffers;
- vlc_mutex_lock( &p_fifo->lock );
+ p_input->mixer.is_invalid = p_input->b_error || p_input->b_paused;
+ if ( p_input->mixer.is_invalid )
+ {
+ if ( i_first_input == i ) i_first_input++;
+ continue;
+ }
p_buffer = p_fifo->p_first;
if ( p_buffer == NULL )
{
- vlc_mutex_unlock( &p_fifo->lock );
break;
}
- if ( !start_date )
+ /* Check for the continuity of start_date */
+ while ( p_buffer != NULL
+ && p_buffer->i_pts + p_buffer->i_length < start_date - 1 )
{
- start_date = p_buffer->start_date;
- end_date += p_buffer->start_date;
- p_input->p_first_byte_to_mix = p_buffer->p_buffer;
+ /* We authorize a +-1 because rounding errors get compensated
+ * regularly. */
+ aout_buffer_t * p_next = p_buffer->p_next;
+ msg_Warn( p_aout, "the mixer got a packet in the past (%"PRId64")",
+ start_date - (p_buffer->i_pts + p_buffer->i_length) );
+ aout_BufferFree( p_buffer );
+ p_fifo->p_first = p_buffer = p_next;
+ p_input->mixer.begin = NULL;
}
- else
+ if ( p_buffer == NULL )
{
- /* Check for the continuity of start_date */
- while ( p_buffer != NULL && p_buffer->end_date < start_date )
- {
- aout_buffer_t * p_next = p_buffer->p_next;
- msg_Err( p_aout, "the mixer got a packet in the past (%lld)",
- start_date - p_buffer->end_date );
- aout_BufferFree( p_buffer );
- p_fifo->p_first = p_buffer = p_next;
- p_input->p_first_byte_to_mix = NULL;
- }
- if ( p_buffer == NULL )
- {
- p_fifo->pp_last = &p_fifo->p_first;
- vlc_mutex_unlock( &p_fifo->lock );
- break;
- }
-
- if ( !AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
- {
- /* Additionally check that p_first_byte_to_mix is well
- * located. */
- unsigned long i_nb_bytes = (start_date - p_buffer->start_date)
- * p_aout->mixer.mixer.i_bytes_per_frame
- * p_aout->mixer.mixer.i_rate
- / p_aout->mixer.mixer.i_frame_length
- / 1000000;
- ptrdiff_t mixer_nb_bytes;
-
- if ( p_input->p_first_byte_to_mix == NULL )
- {
- p_input->p_first_byte_to_mix = p_buffer->p_buffer;
- }
- mixer_nb_bytes = p_input->p_first_byte_to_mix
- - p_buffer->p_buffer;
-
- if ( i_nb_bytes + p_aout->mixer.mixer.i_bytes_per_frame
- < mixer_nb_bytes ||
- i_nb_bytes - p_aout->mixer.mixer.i_bytes_per_frame
- > mixer_nb_bytes )
- {
- msg_Warn( p_aout,
- "mixer start isn't output start (%ld)",
- i_nb_bytes - mixer_nb_bytes );
-
- /* Round to the nearest multiple */
- i_nb_bytes /= p_aout->mixer.mixer.i_bytes_per_frame;
- i_nb_bytes *= p_aout->mixer.mixer.i_bytes_per_frame;
- p_input->p_first_byte_to_mix = p_buffer->p_buffer
- + i_nb_bytes;
- }
- }
+ p_fifo->pp_last = &p_fifo->p_first;
+ break;
}
/* Check that we have enough samples. */
{
p_buffer = p_fifo->p_first;
if ( p_buffer == NULL ) break;
- if ( p_buffer->end_date >= end_date ) break;
+ if ( p_buffer->i_pts + p_buffer->i_length >= end_date ) break;
/* Check that all buffers are contiguous. */
- prev_date = p_fifo->p_first->end_date;
+ prev_date = p_fifo->p_first->i_pts + p_fifo->p_first->i_length;
p_buffer = p_buffer->p_next;
b_drop_buffers = 0;
for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next )
{
- if ( prev_date != p_buffer->start_date )
+ if ( prev_date != p_buffer->i_pts )
{
msg_Warn( p_aout,
- "buffer discontinuity, dropping packets (%lld)",
- p_buffer->start_date - prev_date );
+ "buffer hole, dropping packets (%"PRId64")",
+ p_buffer->i_pts - prev_date );
b_drop_buffers = 1;
break;
}
- if ( p_buffer->end_date >= end_date ) break;
- prev_date = p_buffer->end_date;
+ if ( p_buffer->i_pts + p_buffer->i_length >= end_date ) break;
+ prev_date = p_buffer->i_pts + p_buffer->i_length;
}
if ( b_drop_buffers )
{
}
else break;
}
- vlc_mutex_unlock( &p_fifo->lock );
if ( p_buffer == NULL ) break;
+
+ p_buffer = p_fifo->p_first;
+ if ( !AOUT_FMT_NON_LINEAR( &p_aout->p_mixer->fmt ) )
+ {
+ /* Additionally check that p_first_byte_to_mix is well
+ * located. */
+ mtime_t i_buffer = (start_date - p_buffer->i_pts)
+ * p_aout->p_mixer->fmt.i_bytes_per_frame
+ * p_aout->p_mixer->fmt.i_rate
+ / p_aout->p_mixer->fmt.i_frame_length
+ / 1000000;
+ ptrdiff_t mixer_nb_bytes;
+
+ if ( p_input->mixer.begin == NULL )
+ {
+ p_input->mixer.begin = p_buffer->p_buffer;
+ }
+ mixer_nb_bytes = p_input->mixer.begin - p_buffer->p_buffer;
+
+ if ( !((i_buffer + p_aout->p_mixer->fmt.i_bytes_per_frame
+ > mixer_nb_bytes) &&
+ (i_buffer < p_aout->p_mixer->fmt.i_bytes_per_frame
+ + mixer_nb_bytes)) )
+ {
+ msg_Warn( p_aout, "mixer start isn't output start (%"PRId64")",
+ i_buffer - mixer_nb_bytes );
+
+ /* Round to the nearest multiple */
+ i_buffer /= p_aout->p_mixer->fmt.i_bytes_per_frame;
+ i_buffer *= p_aout->p_mixer->fmt.i_bytes_per_frame;
+ if( i_buffer < 0 )
+ {
+ /* Is it really the best way to do it ? */
+ aout_lock_output_fifo( p_aout );
+ aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
+ date_Set( &exact_start_date, 0 );
+ aout_unlock_output_fifo( p_aout );
+ break;
+ }
+
+ p_input->mixer.begin = p_buffer->p_buffer + i_buffer;
+ }
+ }
}
- if ( i < p_aout->i_nb_inputs )
+ if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs )
{
/* Interrupted before the end... We can't run. */
- vlc_mutex_unlock( &p_aout->output.fifo.lock );
- return;
+ aout_unlock_input_fifos( p_aout );
+ return -1;
}
- p_aout->b_mixer_active = 1;
- vlc_mutex_unlock( &p_aout->output.fifo.lock );
-
/* Run the mixer. */
- aout_BufferAlloc( &p_aout->mixer.output_alloc,
- ((u64)p_aout->output.i_nb_samples * 1000000)
- / p_aout->output.output.i_rate,
- /* This is a bit kludgy, but is actually only used
- * for the S/PDIF dummy mixer : */
- p_aout->pp_inputs[0]->fifo.p_first,
- p_output_buffer );
+ p_output_buffer = aout_BufferAlloc( &p_aout->p_mixer->allocation,
+ ((uint64_t)p_aout->output.i_nb_samples * 1000000)
+ / p_aout->output.output.i_rate,
+ /* This is a bit kludgy, but is actually only used
+ * for the S/PDIF dummy mixer : */
+ p_aout->pp_inputs[i_first_input]->mixer.fifo.p_first);
if ( p_output_buffer == NULL )
{
- msg_Err( p_aout, "out of memory" );
- return;
+ aout_unlock_input_fifos( p_aout );
+ return -1;
+ }
+ /* This is again a bit kludgy - for the S/PDIF mixer. */
+ if ( p_aout->p_mixer->allocation.b_alloc )
+ {
+ p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
+ p_output_buffer->i_buffer = p_aout->output.i_nb_samples
+ * p_aout->p_mixer->fmt.i_bytes_per_frame
+ / p_aout->p_mixer->fmt.i_frame_length;
}
- p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
- p_output_buffer->i_nb_bytes = p_aout->output.i_nb_samples
- * p_aout->output.output.i_bytes_per_frame
- / p_aout->output.output.i_frame_length;
- p_output_buffer->start_date = start_date;
- p_output_buffer->end_date = end_date;
+ p_output_buffer->i_pts = start_date;
+ p_output_buffer->i_length = end_date - start_date;
- p_aout->mixer.pf_do_work( p_aout, p_output_buffer );
+ p_aout->p_mixer->mix( p_aout->p_mixer, p_output_buffer );
+
+ aout_unlock_input_fifos( p_aout );
aout_OutputPlay( p_aout, p_output_buffer );
- vlc_mutex_lock( &p_aout->output.fifo.lock );
- p_aout->b_mixer_active = 0;
- vlc_cond_signal( &p_aout->mixer_signal );
- vlc_mutex_unlock( &p_aout->output.fifo.lock );
+ return 0;
+}
+
+/*****************************************************************************
+ * aout_MixerRun: entry point for the mixer & post-filters processing
+ *****************************************************************************
+ * Please note that you must hold the mixer lock.
+ *****************************************************************************/
+void aout_MixerRun( aout_instance_t * p_aout )
+{
+ while( MixBuffer( p_aout ) != -1 );
+}
+
+/*****************************************************************************
+ * aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier
+ *****************************************************************************
+ * Please note that we assume that you own the mixer lock when entering this
+ * function. This function returns -1 on error.
+ *****************************************************************************/
+int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier )
+{
+ float f_old = p_aout->mixer_multiplier;
+ bool b_new_mixer = false;
+
+ if ( p_aout->p_mixer )
+ {
+ aout_MixerDelete( p_aout );
+ b_new_mixer = true;
+ }
+
+ p_aout->mixer_multiplier = f_multiplier;
+
+ if ( b_new_mixer && aout_MixerNew( p_aout ) )
+ {
+ p_aout->mixer_multiplier = f_old;
+ aout_MixerNew( p_aout );
+ return -1;
+ }
+
+ return 0;
+}
+
+/*****************************************************************************
+ * aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier
+ *****************************************************************************
+ * Please note that we assume that you own the mixer lock when entering this
+ * function. This function returns -1 on error.
+ *****************************************************************************/
+int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier )
+{
+ *pf_multiplier = p_aout->mixer_multiplier;
+ return 0;
}
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