1 /*****************************************************************************
2 * simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
3 *****************************************************************************
4 * Copyright (C) 2002, 2006 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_filter.h>
34 #include <vlc_block.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Create ( vlc_object_t * );
41 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
44 static int OpenFilter ( vlc_object_t * );
45 static block_t *Filter( filter_t *, block_t * );
47 /*****************************************************************************
49 *****************************************************************************/
51 set_description( _("Audio filter for simple channel mixing") );
52 set_capability( "audio filter", 10 );
53 set_category( CAT_AUDIO );
54 set_subcategory( SUBCAT_AUDIO_MISC );
55 set_callbacks( Create, NULL );
58 set_description( _("audio filter for simple channel mixing") );
59 set_capability( "audio filter2", 10 );
60 set_callbacks( OpenFilter, NULL );
63 /*****************************************************************************
64 * Create: allocate trivial channel mixer
65 *****************************************************************************/
66 static int Create( vlc_object_t *p_this )
68 aout_filter_t * p_filter = (aout_filter_t *)p_this;
70 if ( (p_filter->input.i_physical_channels
71 == p_filter->output.i_physical_channels
72 && p_filter->input.i_original_channels
73 == p_filter->output.i_original_channels)
74 || p_filter->input.i_format != p_filter->output.i_format
75 || p_filter->input.i_rate != p_filter->output.i_rate
76 || p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
81 /* Only conversion to Mono, Stereo and 4.0 right now */
82 if( p_filter->output.i_physical_channels !=
83 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
84 && p_filter->output.i_physical_channels !=
85 ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
86 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT)
87 && p_filter->output.i_physical_channels != AOUT_CHAN_CENTER )
92 /* Only from 7/7.1/5/5.1/2.0 */
93 if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
94 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
95 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
96 (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
97 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
98 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
99 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
100 p_filter->input.i_physical_channels !=
101 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
106 p_filter->pf_do_work = DoWork;
107 p_filter->b_in_place = 0;
112 /*****************************************************************************
113 * DoWork: convert a buffer
114 *****************************************************************************/
115 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
116 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
118 int i_input_nb = aout_FormatNbChannels( &p_filter->input );
119 int i_output_nb = aout_FormatNbChannels( &p_filter->output );
120 float *p_dest = (float *)p_out_buf->p_buffer;
121 float *p_src = (float *)p_in_buf->p_buffer;
124 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
125 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
127 if( p_filter->output.i_physical_channels ==
128 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
130 if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
131 for( i = p_in_buf->i_nb_samples; i--; )
133 *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
135 *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
140 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
143 for( i = p_in_buf->i_nb_samples; i--; )
145 *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
147 *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
152 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
155 else if( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
157 if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
158 for( i = p_in_buf->i_nb_samples; i--; )
160 *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;
165 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
167 else if( p_filter->input.i_physical_channels & AOUT_CHAN_REARLEFT )
168 for( i = p_in_buf->i_nb_samples; i--; )
170 *p_dest = p_src[4] + p_src[0] / 4 + p_src[1] / 4 + p_src[2] / 6 + p_src[3] / 6;
175 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
178 for( i = p_in_buf->i_nb_samples; i--; )
180 *p_dest = p_src[0] / 2 + p_src[1] / 2;
188 if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
189 for( i = p_in_buf->i_nb_samples; i--; )
191 *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 6;
193 *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 6;
195 *p_dest = p_src[2] / 6 + p_src[4];
197 *p_dest = p_src[3] / 6 + p_src[5];
202 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
205 for( i = p_in_buf->i_nb_samples; i--; )
207 *p_dest = p_src[4] + 0.5 * p_src[0];
209 *p_dest = p_src[4] + 0.5 * p_src[1];
218 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
224 /*****************************************************************************
226 *****************************************************************************/
227 static int OpenFilter( vlc_object_t *p_this )
229 filter_t *p_filter = (filter_t *)p_this;
231 if ( (p_filter->fmt_in.audio.i_physical_channels
232 == p_filter->fmt_out.audio.i_physical_channels
233 && p_filter->fmt_in.audio.i_original_channels
234 == p_filter->fmt_out.audio.i_original_channels)
235 || p_filter->fmt_in.i_codec != p_filter->fmt_out.i_codec
236 || p_filter->fmt_in.audio.i_rate != p_filter->fmt_out.audio.i_rate
237 || p_filter->fmt_in.i_codec != VLC_FOURCC('f','l','3','2') )
242 /* Only conversion to Mono, Stereo and 4.0 right now */
243 if( p_filter->fmt_out.audio.i_physical_channels !=
244 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
245 && p_filter->fmt_out.audio.i_physical_channels !=
246 ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
247 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT)
248 && p_filter->fmt_out.audio.i_physical_channels != AOUT_CHAN_CENTER )
253 /* Only from 7/7.1/5/5.1/2.0 */
254 if( (p_filter->fmt_in.audio.i_physical_channels & ~AOUT_CHAN_LFE) !=
255 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
256 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
257 (p_filter->fmt_in.audio.i_physical_channels & ~AOUT_CHAN_LFE) !=
258 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
259 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
260 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
261 p_filter->fmt_in.audio.i_physical_channels !=
262 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
267 p_filter->pf_audio_filter = Filter;
272 /*****************************************************************************
274 *****************************************************************************/
275 static block_t *Filter( filter_t *p_filter, block_t *p_block )
277 aout_filter_t aout_filter;
278 aout_buffer_t in_buf, out_buf;
282 if( !p_block || !p_block->i_samples )
284 if( p_block ) p_block->pf_release( p_block );
288 i_out_size = p_block->i_samples *
289 p_filter->fmt_out.audio.i_bitspersample *
290 p_filter->fmt_out.audio.i_channels / 8;
292 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
295 msg_Warn( p_filter, "can't get output buffer" );
296 p_block->pf_release( p_block );
300 p_out->i_samples = p_block->i_samples;
301 p_out->i_dts = p_block->i_dts;
302 p_out->i_pts = p_block->i_pts;
303 p_out->i_length = p_block->i_length;
305 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
306 aout_filter.input = p_filter->fmt_in.audio;
307 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
308 aout_filter.output = p_filter->fmt_out.audio;
309 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
311 in_buf.p_buffer = p_block->p_buffer;
312 in_buf.i_nb_bytes = p_block->i_buffer;
313 in_buf.i_nb_samples = p_block->i_samples;
314 out_buf.p_buffer = p_out->p_buffer;
315 out_buf.i_nb_bytes = p_out->i_buffer;
316 out_buf.i_nb_samples = p_out->i_samples;
318 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
320 p_block->pf_release( p_block );
322 p_out->i_buffer = out_buf.i_nb_bytes;
323 p_out->i_samples = out_buf.i_nb_samples;