/*****************************************************************************
- * simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
+ * simple.c : simple channel mixer plug-in
*****************************************************************************
- * Copyright (C) 2002 VideoLAN (Centrale Réseaux) and its contributors
+ * Copyright (C) 2002, 2004, 2006-2009 the VideoLAN team
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
*
* 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> /* malloc(), free() */
-#include <string.h>
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
-#include <vlc/vlc.h>
-#include "audio_output.h"
-#include "aout_internal.h"
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_aout.h>
+#include <vlc_filter.h>
+#include <vlc_block.h>
+#include <assert.h>
/*****************************************************************************
- * Local prototypes
+ * Module descriptor
*****************************************************************************/
-static int Create ( vlc_object_t * );
+static int OpenFilter( vlc_object_t * );
-static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
- aout_buffer_t * );
+vlc_module_begin ()
+ set_description( N_("Audio filter for simple channel mixing") )
+ set_category( CAT_AUDIO )
+ set_subcategory( SUBCAT_AUDIO_MISC )
+ set_capability( "audio filter", 10 )
+ set_callbacks( OpenFilter, NULL )
+vlc_module_end ()
/*****************************************************************************
- * Module descriptor
+ * Local prototypes
*****************************************************************************/
-vlc_module_begin();
- set_description( _("audio filter for simple channel mixing") );
- set_capability( "audio filter", 10 );
- set_category( CAT_AUDIO );
- set_subcategory( SUBCAT_AUDIO_MISC );
- set_callbacks( Create, NULL );
-vlc_module_end();
+#define AOUT_CHANS_STEREO_FRONT ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT )
+#define AOUT_CHANS_STEREO_REAR ( AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT )
+#define AOUT_CHANS_STEREO_MIDDLE (AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT )
+
+#define AOUT_CHANS_2_0 AOUT_CHANS_STEREO_FRONT
+#define AOUT_CHANS_3_0 ( AOUT_CHANS_STEREO_FRONT | AOUT_CHAN_CENTER )
+#define AOUT_CHANS_4_0 ( AOUT_CHANS_STEREO_FRONT | AOUT_CHANS_STEREO_REAR )
+#define AOUT_CHANS_4_0_MIDDLE ( AOUT_CHANS_STEREO_FRONT | AOUT_CHANS_STEREO_MIDDLE )
+#define AOUT_CHANS_4_CENTER_REAR (AOUT_CHANS_STEREO_FRONT | AOUT_CHAN_CENTER | AOUT_CHAN_REARCENTER)
+#define AOUT_CHANS_5_0 ( AOUT_CHANS_4_0 | AOUT_CHAN_CENTER )
+#define AOUT_CHANS_5_0_MIDDLE ( AOUT_CHANS_4_0_MIDDLE | AOUT_CHAN_CENTER )
+#define AOUT_CHANS_6_0 ( AOUT_CHANS_STEREO_FRONT | AOUT_CHANS_STEREO_REAR | AOUT_CHANS_STEREO_MIDDLE )
+#define AOUT_CHANS_7_0 ( AOUT_CHANS_6_0 | AOUT_CHAN_CENTER )
+
+static bool IsSupported( const audio_format_t *p_input, const audio_format_t *p_output );
+
+static block_t *Filter( filter_t *, block_t * );
/*****************************************************************************
- * Create: allocate trivial channel mixer
+ * DoWork: convert a buffer
*****************************************************************************/
-static int Create( vlc_object_t *p_this )
+static void DoWork( filter_t * p_filter,
+ aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
{
- aout_filter_t * p_filter = (aout_filter_t *)p_this;
-
- if ( (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 != 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') )
+ const unsigned i_input_physical = p_filter->fmt_in.audio.i_physical_channels;
+
+ const bool b_input_7_0 = (i_input_physical & ~AOUT_CHAN_LFE) == AOUT_CHANS_7_0;
+ const bool b_input_5_0 = !b_input_7_0 &&
+ ( (i_input_physical & AOUT_CHANS_5_0) == AOUT_CHANS_5_0 ||
+ (i_input_physical & AOUT_CHANS_5_0_MIDDLE) == AOUT_CHANS_5_0_MIDDLE );
+ const bool b_input_4_center_rear = !b_input_7_0 && !b_input_5_0 &&
+ (i_input_physical & ~AOUT_CHAN_LFE) == AOUT_CHANS_4_CENTER_REAR;
+ const bool b_input_3_0 = !b_input_7_0 && !b_input_5_0 && !b_input_4_center_rear &&
+ (i_input_physical & ~AOUT_CHAN_LFE) == AOUT_CHANS_3_0;
+
+ int i_input_nb = aout_FormatNbChannels( &p_filter->fmt_in.audio );
+ int i_output_nb = aout_FormatNbChannels( &p_filter->fmt_out.audio );
+ float *p_dest = (float *)p_out_buf->p_buffer;
+ const float *p_src = (const float *)p_in_buf->p_buffer;
+ int i;
+
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_buffer = p_in_buf->i_buffer * i_output_nb / i_input_nb;
+
+ if( p_filter->fmt_out.audio.i_physical_channels == AOUT_CHANS_2_0 )
{
- return -1;
+ if( b_input_7_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
+ p_dest++;
+ *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
+ p_dest++;
+
+ p_src += 7;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else if( b_input_5_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
+ p_dest++;
+ *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
+ p_dest++;
+
+ p_src += 5;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else if( b_input_3_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[2] + 0.5 * p_src[0];
+ p_dest++;
+ *p_dest = p_src[2] + 0.5 * p_src[1];
+ p_dest++;
+
+ p_src += 3;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else if (b_input_4_center_rear)
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[2] + p_src[3] + 0.5 * p_src[0];
+ p_dest++;
+ *p_dest = p_src[2] + p_src[3] + 0.5 * p_src[1];
+ p_dest++;
+ p_src += 4;
+ }
}
+ else if( p_filter->fmt_out.audio.i_physical_channels == AOUT_CHAN_CENTER )
+ {
+ if( b_input_7_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[6] + p_src[0] / 4 + p_src[1] / 4 + p_src[2] / 8 + p_src[3] / 8 + p_src[4] / 8 + p_src[5] / 8;
+ p_dest++;
+
+ p_src += 7;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else if( b_input_5_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[4] + p_src[0] / 4 + p_src[1] / 4 + p_src[2] / 6 + p_src[3] / 6;
+ p_dest++;
+
+ p_src += 5;
- /* Only conversion to Stereo right now */
- if( p_filter->output.i_physical_channels !=
- (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) ) return -1;
-
- /* Only from 7/7.1/5/5.1 */
- if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
- (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
- AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
- (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
- (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
- AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
- AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) )
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else if( b_input_3_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[2] + p_src[0] / 4 + p_src[1] / 4;
+ p_dest++;
+
+ p_src += 3;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[0] / 2 + p_src[1] / 2;
+ p_dest++;
+
+ p_src += 2;
+ }
+ }
+ else
{
- return -1;
+ assert( p_filter->fmt_out.audio.i_physical_channels == AOUT_CHANS_4_0 );
+ assert( b_input_7_0 || b_input_5_0 );
+
+ if( b_input_7_0 )
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 6;
+ p_dest++;
+ *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 6;
+ p_dest++;
+ *p_dest = p_src[2] / 6 + p_src[4];
+ p_dest++;
+ *p_dest = p_src[3] / 6 + p_src[5];
+ p_dest++;
+
+ p_src += 7;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
+ else
+ for( i = p_in_buf->i_nb_samples; i--; )
+ {
+ *p_dest = p_src[4] + 0.5 * p_src[0];
+ p_dest++;
+ *p_dest = p_src[4] + 0.5 * p_src[1];
+ p_dest++;
+ *p_dest = p_src[2];
+ p_dest++;
+ *p_dest = p_src[3];
+ p_dest++;
+
+ p_src += 5;
+
+ if( p_filter->fmt_in.audio.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ }
}
+}
+
+/*****************************************************************************
+ * OpenFilter:
+ *****************************************************************************/
+static int OpenFilter( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+
+ audio_format_t fmt_in = p_filter->fmt_in.audio;
+ audio_format_t fmt_out = p_filter->fmt_out.audio;
+
+ fmt_in.i_format = p_filter->fmt_in.i_codec;
+ fmt_out.i_format = p_filter->fmt_out.i_codec;
- p_filter->pf_do_work = DoWork;
- p_filter->b_in_place = 0;
+ if( !IsSupported( &fmt_in, &fmt_out ) )
+ return -1;
+
+ p_filter->pf_audio_filter = Filter;
return 0;
}
/*****************************************************************************
- * DoWork: convert a buffer
+ * Filter:
*****************************************************************************/
-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 )
+static block_t *Filter( filter_t *p_filter, block_t *p_block )
{
- int i_input_nb = aout_FormatNbChannels( &p_filter->input );
- int i_output_nb = aout_FormatNbChannels( &p_filter->output );
- float *p_dest = (float *)p_out_buf->p_buffer;
- float *p_src = (float *)p_in_buf->p_buffer;
- int i;
+ if( !p_block || !p_block->i_nb_samples )
+ {
+ if( p_block )
+ block_Release( p_block );
+ return NULL;
+ }
- 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;
+ size_t i_out_size = p_block->i_nb_samples *
+ p_filter->fmt_out.audio.i_bitspersample *
+ p_filter->fmt_out.audio.i_channels / 8;
- if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
- for( i = p_in_buf->i_nb_samples; i--; )
+ block_t *p_out = filter_NewAudioBuffer( p_filter, i_out_size );
+ if( !p_out )
{
- *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
- p_dest++;
- *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
- p_dest++;
+ msg_Warn( p_filter, "can't get output buffer" );
+ block_Release( p_block );
+ return NULL;
+ }
- p_src += 7;
+ p_out->i_nb_samples = p_block->i_nb_samples;
+ p_out->i_dts = p_block->i_dts;
+ p_out->i_pts = p_block->i_pts;
+ p_out->i_length = p_block->i_length;
- if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
- }
- else
- for( i = p_in_buf->i_nb_samples; i--; )
+ DoWork( p_filter, p_block, p_out );
+
+ block_Release( p_block );
+
+ return p_out;
+}
+
+/*****************************************************************************
+ * Helpers:
+ *****************************************************************************/
+static bool IsSupported( const audio_format_t *p_input, const audio_format_t *p_output )
+{
+ if( p_input->i_format != VLC_CODEC_FL32 ||
+ p_input->i_format != p_output->i_format ||
+ p_input->i_rate != p_output->i_rate )
+ return false;
+
+ if( p_input->i_physical_channels == p_output->i_physical_channels &&
+ p_input->i_original_channels == p_output->i_original_channels )
{
- *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
- p_dest++;
- *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
- p_dest++;
+ return false;
+ }
- p_src += 5;
+ /* Only conversion to Mono, Stereo and 4.0 right now */
+ if( p_output->i_physical_channels != AOUT_CHAN_CENTER &&
+ p_output->i_physical_channels != AOUT_CHANS_2_0 &&
+ p_output->i_physical_channels != AOUT_CHANS_4_0 )
+ {
+ return false;
+ }
- if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
+ /* Only from 7/7.1/5/5.1/3/3.1/2.0
+ * XXX 5.X rear and middle are handled the same way */
+ if( (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_7_0 &&
+ (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_5_0 &&
+ (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_5_0_MIDDLE &&
+ (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_3_0 &&
+ (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_4_CENTER_REAR &&
+ p_input->i_physical_channels != AOUT_CHANS_2_0 )
+ {
+ return false;
}
+
+ /* Only if we downmix */
+ if( aout_FormatNbChannels( p_input ) <= aout_FormatNbChannels( p_output ) )
+ return false;
+
+ return true;
}
+
projects / vlc / blobdiff