* trivial.c : trivial mixer plug-in (1 input, no downmixing)
*****************************************************************************
* Copyright (C) 2002 VideoLAN
- * $Id: trivial.c,v 1.4 2002/08/12 22:12:50 massiot Exp $
+ * $Id: trivial.c,v 1.6 2002/08/21 22:41:59 massiot Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* Module descriptor
*****************************************************************************/
vlc_module_begin();
- set_description( _("trivial aout mixer module") );
+ set_description( _("trivial audio mixer module") );
set_capability( "audio mixer", 1 );
- add_shortcut( "trivial" );
set_callbacks( Create, NULL );
vlc_module_end();
{
aout_instance_t * p_aout = (aout_instance_t *)p_this;
- if ( p_aout->mixer.output.i_format != AOUT_FMT_FLOAT32
- && p_aout->mixer.output.i_format != AOUT_FMT_FIXED32 )
+ if ( p_aout->mixer.mixer.i_format != AOUT_FMT_FLOAT32
+ && p_aout->mixer.mixer.i_format != AOUT_FMT_FIXED32 )
{
return -1;
}
return 0;
}
-/*****************************************************************************
- * SparseCopy: trivially downmix or upmix a buffer
- *****************************************************************************/
-static void SparseCopy( u32 * p_dest, const u32 * p_src, size_t i_len,
- int i_output_stride, int i_input_stride )
-{
- int i;
- for ( i = 0; i < i_len; i++ )
- {
- int j;
- for ( j = 0; j < i_output_stride; j++ )
- {
- p_dest[j] = p_src[j];
- }
- p_src += i_input_stride;
- p_dest += i_output_stride;
- }
-}
-
/*****************************************************************************
* DoWork: mix a new output buffer
*****************************************************************************/
static void DoWork( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
{
aout_input_t * p_input = p_aout->pp_inputs[0];
+ int i_nb_bytes = p_buffer->i_nb_samples * sizeof(s32)
+ * p_aout->mixer.mixer.i_channels;
+ byte_t * p_in = p_input->p_first_byte_to_mix;
+ byte_t * p_out = p_buffer->p_buffer;
- if ( p_input->input.i_channels == p_aout->mixer.output.i_channels )
+ for ( ; ; )
{
- int i_nb_bytes = p_buffer->i_nb_samples * sizeof(u32)
- * p_input->input.i_channels;
- byte_t * p_in = (p_input->p_first_byte_to_mix == NULL) ?
- p_input->fifo.p_first->p_buffer :
- p_input->p_first_byte_to_mix;
- byte_t * p_out = p_buffer->p_buffer;
+ ptrdiff_t i_available_bytes = (p_input->fifo.p_first->p_buffer
+ - p_in)
+ + p_input->fifo.p_first->i_nb_samples
+ * sizeof(s32)
+ * p_aout->mixer.mixer.i_channels;
- for ( ; ; )
+ if ( i_available_bytes < i_nb_bytes )
{
- ptrdiff_t i_available_bytes = (p_input->fifo.p_first->p_buffer
- - p_in)
- + p_input->fifo.p_first->i_nb_samples
- * sizeof(u32)
- * p_input->input.i_channels;
-
- if ( i_available_bytes < i_nb_bytes )
- {
- aout_buffer_t * p_old_buffer;
+ aout_buffer_t * p_old_buffer;
- if ( i_available_bytes > 0 )
- p_aout->p_vlc->pf_memcpy( p_out, p_in, i_available_bytes );
- i_nb_bytes -= i_available_bytes;
- p_out += i_available_bytes;
+ if ( i_available_bytes > 0 )
+ p_aout->p_vlc->pf_memcpy( p_out, p_in, i_available_bytes );
+ i_nb_bytes -= i_available_bytes;
+ p_out += i_available_bytes;
- /* Next buffer */
- p_old_buffer = aout_FifoPop( p_aout, &p_input->fifo );
- aout_BufferFree( p_old_buffer );
- if ( p_input->fifo.p_first == NULL )
- {
- msg_Err( p_aout, "internal amix error" );
- return;
- }
- p_in = p_input->fifo.p_first->p_buffer;
- }
- else
+ /* Next buffer */
+ p_old_buffer = aout_FifoPop( p_aout, &p_input->fifo );
+ aout_BufferFree( p_old_buffer );
+ if ( p_input->fifo.p_first == NULL )
{
- p_aout->p_vlc->pf_memcpy( p_out, p_in, i_nb_bytes );
- p_input->p_first_byte_to_mix = p_in + i_nb_bytes;
- break;
+ msg_Err( p_aout, "internal amix error" );
+ return;
}
+ p_in = p_input->fifo.p_first->p_buffer;
}
- }
- else
- {
- /* Downmixing or upmixing. */
- int i_nb_samples = p_buffer->i_nb_samples;
- u32 * p_in = (p_input->p_first_byte_to_mix == NULL) ?
- (u32 *)p_input->fifo.p_first->p_buffer :
- (u32 *)p_input->p_first_byte_to_mix;
- u32 * p_out = (u32 *)p_buffer->p_buffer;
-
- if ( p_input->input.i_channels < p_aout->mixer.output.i_channels )
+ else
{
- /* Zero out the destination buffer, to avoid static on unavailable
- * channels. */
- memset( p_buffer->p_buffer, 0,
- p_buffer->i_nb_samples * sizeof(u32)
- * p_aout->mixer.output.i_channels );
- }
-
- for ( ; ; )
- {
- ptrdiff_t i_available_bytes = (p_input->fifo.p_first->p_buffer
- - (byte_t *)p_in)
- + p_input->fifo.p_first->i_nb_samples
- * sizeof(u32)
- * p_input->input.i_channels;
- int i_available_samples = i_available_bytes
- / p_input->input.i_channels
- / sizeof(u32);
-
- if ( i_available_samples < i_nb_samples )
- {
- aout_buffer_t * p_old_buffer;
-
- if ( i_available_samples > 0 )
- SparseCopy( p_out, p_in, i_available_samples,
- p_aout->mixer.output.i_channels,
- p_input->input.i_channels );
- i_nb_samples -= i_available_samples;
- p_out += i_available_samples * p_aout->mixer.output.i_channels;
-
- /* Next buffer */
- p_old_buffer = aout_FifoPop( p_aout, &p_input->fifo );
- aout_BufferFree( p_old_buffer );
- if ( p_input->fifo.p_first == NULL )
- {
- msg_Err( p_aout, "internal amix error" );
- return;
- }
- p_in = (u32 *)p_input->fifo.p_first->p_buffer;
- }
- else
- {
- SparseCopy( p_out, p_in, i_nb_samples,
- p_aout->mixer.output.i_channels,
- p_input->input.i_channels );
- p_input->p_first_byte_to_mix = (byte_t *)p_in
- + i_nb_samples * p_input->input.i_channels
- * sizeof(u32);
- break;
- }
+ if ( i_nb_bytes > 0 )
+ p_aout->p_vlc->pf_memcpy( p_out, p_in, i_nb_bytes );
+ p_input->p_first_byte_to_mix = p_in + i_nb_bytes;
+ break;
}
}
}
projects / vlc / blobdiff