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 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
34 #include <vlc_filter.h>
35 #include <vlc_block.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 static int Create ( vlc_object_t * );
41 static int OpenFilter( vlc_object_t * );
44 set_description( N_("Audio filter for simple channel mixing") )
45 set_capability( "audio filter", 10 )
46 set_category( CAT_AUDIO )
47 set_subcategory( SUBCAT_AUDIO_MISC )
48 set_callbacks( Create, NULL )
51 set_description( N_("audio filter for simple channel mixing") )
52 set_capability( "audio filter2", 10 )
53 set_callbacks( OpenFilter, NULL )
56 /*****************************************************************************
58 *****************************************************************************/
59 #define AOUT_CHANS_STEREO_FRONT ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT )
60 #define AOUT_CHANS_STEREO_REAR ( AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT )
61 #define AOUT_CHANS_STEREO_MIDDLE (AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT )
63 #define AOUT_CHANS_2_0 AOUT_CHANS_STEREO_FRONT
64 #define AOUT_CHANS_4_0 ( AOUT_CHANS_STEREO_FRONT | AOUT_CHANS_STEREO_REAR )
65 #define AOUT_CHANS_4_0_MIDDLE ( AOUT_CHANS_STEREO_FRONT | AOUT_CHANS_STEREO_MIDDLE )
66 #define AOUT_CHANS_5_0 ( AOUT_CHANS_4_0 | AOUT_CHAN_CENTER )
67 #define AOUT_CHANS_5_0_MIDDLE ( AOUT_CHANS_4_0_MIDDLE | AOUT_CHAN_CENTER )
68 #define AOUT_CHANS_6_0 ( AOUT_CHANS_STEREO_FRONT | AOUT_CHANS_STEREO_REAR | AOUT_CHANS_STEREO_MIDDLE )
69 #define AOUT_CHANS_7_0 ( AOUT_CHANS_6_0 | AOUT_CHAN_CENTER )
71 static bool IsSupported( const audio_format_t *p_input, const audio_format_t *p_output );
73 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
76 static block_t *Filter( filter_t *, block_t * );
78 /*****************************************************************************
79 * Create: allocate trivial channel mixer
80 *****************************************************************************/
81 static int Create( vlc_object_t *p_this )
83 aout_filter_t * p_filter = (aout_filter_t *)p_this;
85 if( !IsSupported( &p_filter->input, &p_filter->output ) )
88 p_filter->pf_do_work = DoWork;
89 p_filter->b_in_place = 0;
94 /*****************************************************************************
95 * DoWork: convert a buffer
96 *****************************************************************************/
97 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
98 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
101 const unsigned i_input_physical = p_filter->input.i_physical_channels;
103 const bool b_input_7_0 = (i_input_physical & ~AOUT_CHAN_LFE) == AOUT_CHANS_7_0;
104 const bool b_input_5_0 = !b_input_7_0 &&
105 ( (i_input_physical & AOUT_CHANS_5_0) == AOUT_CHANS_5_0 ||
106 (i_input_physical & AOUT_CHANS_5_0_MIDDLE) == AOUT_CHANS_5_0_MIDDLE );
107 int i_input_nb = aout_FormatNbChannels( &p_filter->input );
108 int i_output_nb = aout_FormatNbChannels( &p_filter->output );
109 float *p_dest = (float *)p_out_buf->p_buffer;
110 const float *p_src = (const float *)p_in_buf->p_buffer;
113 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
114 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
116 if( p_filter->output.i_physical_channels == AOUT_CHANS_2_0 )
119 for( i = p_in_buf->i_nb_samples; i--; )
121 *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
123 *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
128 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
131 for( i = p_in_buf->i_nb_samples; i--; )
133 *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
135 *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
140 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
143 else if( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
146 for( i = p_in_buf->i_nb_samples; i--; )
148 *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;
153 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
155 else if( b_input_5_0 )
156 for( i = p_in_buf->i_nb_samples; i--; )
158 *p_dest = p_src[4] + p_src[0] / 4 + p_src[1] / 4 + p_src[2] / 6 + p_src[3] / 6;
163 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
166 for( i = p_in_buf->i_nb_samples; i--; )
168 *p_dest = p_src[0] / 2 + p_src[1] / 2;
177 for( i = p_in_buf->i_nb_samples; i--; )
179 *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 6;
181 *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 6;
183 *p_dest = p_src[2] / 6 + p_src[4];
185 *p_dest = p_src[3] / 6 + p_src[5];
190 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
193 for( i = p_in_buf->i_nb_samples; i--; )
195 *p_dest = p_src[4] + 0.5 * p_src[0];
197 *p_dest = p_src[4] + 0.5 * p_src[1];
206 if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
211 /*****************************************************************************
213 *****************************************************************************/
214 static int OpenFilter( vlc_object_t *p_this )
216 filter_t *p_filter = (filter_t *)p_this;
218 audio_format_t fmt_in = p_filter->fmt_in.audio;
219 audio_format_t fmt_out = p_filter->fmt_out.audio;
221 fmt_in.i_format = p_filter->fmt_in.i_codec;
222 fmt_out.i_format = p_filter->fmt_out.i_codec;
224 if( !IsSupported( &fmt_in, &fmt_out ) )
227 p_filter->pf_audio_filter = Filter;
232 /*****************************************************************************
234 *****************************************************************************/
235 static block_t *Filter( filter_t *p_filter, block_t *p_block )
237 aout_filter_t aout_filter;
238 aout_buffer_t in_buf, out_buf;
242 if( !p_block || !p_block->i_samples )
245 block_Release( p_block );
249 i_out_size = p_block->i_samples *
250 p_filter->fmt_out.audio.i_bitspersample *
251 p_filter->fmt_out.audio.i_channels / 8;
253 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
256 msg_Warn( p_filter, "can't get output buffer" );
257 block_Release( p_block );
261 p_out->i_samples = p_block->i_samples;
262 p_out->i_dts = p_block->i_dts;
263 p_out->i_pts = p_block->i_pts;
264 p_out->i_length = p_block->i_length;
266 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
267 aout_filter.input = p_filter->fmt_in.audio;
268 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
269 aout_filter.output = p_filter->fmt_out.audio;
270 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
272 in_buf.p_buffer = p_block->p_buffer;
273 in_buf.i_nb_bytes = p_block->i_buffer;
274 in_buf.i_nb_samples = p_block->i_samples;
275 out_buf.p_buffer = p_out->p_buffer;
276 out_buf.i_nb_bytes = p_out->i_buffer;
277 out_buf.i_nb_samples = p_out->i_samples;
279 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
281 block_Release( p_block );
283 p_out->i_buffer = out_buf.i_nb_bytes;
284 p_out->i_samples = out_buf.i_nb_samples;
289 /*****************************************************************************
291 *****************************************************************************/
292 static bool IsSupported( const audio_format_t *p_input, const audio_format_t *p_output )
294 if( p_input->i_format != VLC_FOURCC('f','l','3','2') ||
295 p_input->i_format != p_output->i_format ||
296 p_input->i_rate != p_output->i_rate )
299 if( p_input->i_physical_channels == p_output->i_physical_channels &&
300 p_input->i_original_channels == p_output->i_original_channels )
305 /* Only conversion to Mono, Stereo and 4.0 right now */
306 if( p_output->i_physical_channels != AOUT_CHAN_CENTER &&
307 p_output->i_physical_channels != AOUT_CHANS_2_0 &&
308 p_output->i_physical_channels != AOUT_CHANS_4_0 )
313 /* Only from 7/7.1/5/5.1/2.0
314 * XXX 5.X rear and middle are handled the same way */
315 if( (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_7_0 &&
316 (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_5_0 &&
317 (p_input->i_physical_channels & ~AOUT_CHAN_LFE) != AOUT_CHANS_5_0_MIDDLE &&
318 p_input->i_physical_channels != AOUT_CHANS_2_0 )
323 /* Only if we downmix */
324 if( aout_FormatNbChannels( p_input ) <= aout_FormatNbChannels( p_output ) )