Fix a bunch of warnings and errors
[vlc.git] / modules / audio_filter / resampler / linear.c
1 /*****************************************************************************
2  * linear.c : linear interpolation resampler
3  *****************************************************************************
4  * Copyright (C) 2002, 2006 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
8  *          Sigmund Augdal Helberg <dnumgis@videolan.org>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #include <stdlib.h>                                      /* malloc(), free() */
29 #include <string.h>
30
31 #include <vlc/vlc.h>
32 #include "audio_output.h"
33 #include "aout_internal.h"
34 #include "vlc_filter.h"
35 #include "vlc_block.h"
36
37 /*****************************************************************************
38  * Local prototypes
39  *****************************************************************************/
40 static int  Create    ( vlc_object_t * );
41 static void Close     ( vlc_object_t * );
42 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
43                         aout_buffer_t * );
44
45 static int  OpenFilter ( vlc_object_t * );
46 static void CloseFilter( vlc_object_t * );
47 static block_t *Resample( filter_t *, block_t * );
48
49 /*****************************************************************************
50  * Local structures
51  *****************************************************************************/
52 struct filter_sys_t
53 {
54     int32_t *p_prev_sample;       /* this filter introduces a 1 sample delay */
55
56     unsigned int i_remainder;                /* remainder of previous sample */
57
58     audio_date_t end_date;
59 };
60
61 /*****************************************************************************
62  * Module descriptor
63  *****************************************************************************/
64 vlc_module_begin();
65     set_description( _("Audio filter for linear interpolation resampling") );
66     set_category( CAT_AUDIO );
67     set_subcategory( SUBCAT_AUDIO_MISC );
68     set_capability( "audio filter", 5 );
69     set_callbacks( Create, Close );
70
71     add_submodule();
72     set_description( _("Audio filter for linear interpolation resampling") );
73     set_capability( "audio filter2", 5 );
74     set_callbacks( OpenFilter, CloseFilter );
75 vlc_module_end();
76
77 /*****************************************************************************
78  * Create: allocate linear resampler
79  *****************************************************************************/
80 static int Create( vlc_object_t *p_this )
81 {
82     aout_filter_t * p_filter = (aout_filter_t *)p_this;
83     struct filter_sys_t * p_sys;
84     
85     if ( p_filter->input.i_rate == p_filter->output.i_rate
86           || p_filter->input.i_format != p_filter->output.i_format
87           || p_filter->input.i_physical_channels
88               != p_filter->output.i_physical_channels
89           || p_filter->input.i_original_channels
90               != p_filter->output.i_original_channels
91           || p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
92     {
93         return VLC_EGENERIC;
94     }
95
96     /* Allocate the memory needed to store the module's structure */
97     p_sys = malloc( sizeof(filter_sys_t) );
98     p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
99     if( p_sys == NULL )
100     {
101         msg_Err( p_filter, "out of memory" );
102         return VLC_ENOMEM;
103     }
104     p_sys->p_prev_sample = malloc(
105         aout_FormatNbChannels( &p_filter->input ) * sizeof(int32_t) );
106     if( p_sys->p_prev_sample == NULL )
107     {
108         msg_Err( p_filter, "out of memory" );
109         return VLC_ENOMEM;
110     }
111
112     p_filter->pf_do_work = DoWork;
113
114     /* We don't want a new buffer to be created because we're not sure we'll
115      * actually need to resample anything. */
116     p_filter->b_in_place = VLC_TRUE;
117
118     return VLC_SUCCESS;
119 }
120
121 /*****************************************************************************
122  * Close: free our resources
123  *****************************************************************************/
124 static void Close( vlc_object_t * p_this )
125 {
126     aout_filter_t * p_filter = (aout_filter_t *)p_this;
127     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
128     
129     free( p_sys->p_prev_sample );
130     free( p_sys );
131 }
132
133 /*****************************************************************************
134  * DoWork: convert a buffer
135  *****************************************************************************/
136 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
137                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
138 {
139     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
140 #ifndef HAVE_ALLOCA
141     float *p_in_orig;
142 #endif
143     float *p_in, *p_out = (float *)p_out_buf->p_buffer;
144     float *p_prev_sample = (float *)p_sys->p_prev_sample;
145
146     int i_nb_channels = aout_FormatNbChannels( &p_filter->input );
147     int i_in_nb = p_in_buf->i_nb_samples;
148     int i_chan, i_in, i_out = 0;
149
150     /* Check if we really need to run the resampler */
151     if( p_aout->mixer.mixer.i_rate == p_filter->input.i_rate )
152     {
153         if( p_filter->b_continuity &&
154             p_in_buf->i_size >=
155               p_in_buf->i_nb_bytes + sizeof(float) * i_nb_channels )
156         {
157             /* output the whole thing with the last sample from last time */
158             memmove( ((float *)(p_in_buf->p_buffer)) + i_nb_channels,
159                      p_in_buf->p_buffer, p_in_buf->i_nb_bytes );
160             memcpy( p_in_buf->p_buffer, p_prev_sample,
161                     i_nb_channels * sizeof(float) );
162         }
163         p_filter->b_continuity = VLC_FALSE;
164         return;
165     }
166
167 #ifdef HAVE_ALLOCA
168     p_in = (float *)alloca( p_in_buf->i_nb_bytes );
169 #else
170     p_in_orig = p_in = (float *)malloc( p_in_buf->i_nb_bytes );
171 #endif
172     if( p_in == NULL )
173     {
174         return;
175     }
176
177     p_aout->p_vlc->pf_memcpy( p_in, p_in_buf->p_buffer, p_in_buf->i_nb_bytes );
178
179     /* Take care of the previous input sample (if any) */
180     if( !p_filter->b_continuity )
181     {
182         p_filter->b_continuity = VLC_TRUE;
183         p_sys->i_remainder = 0;
184         aout_DateInit( &p_sys->end_date, p_filter->output.i_rate );
185     }
186     else
187     {
188         while( p_sys->i_remainder < p_filter->output.i_rate )
189         {
190             for( i_chan = i_nb_channels ; i_chan ; )
191             {
192                 i_chan--;
193                 p_out[i_chan] = p_prev_sample[i_chan];
194                 p_out[i_chan] += ( ( p_in[i_chan] - p_prev_sample[i_chan] )
195                                    * p_sys->i_remainder
196                                    / p_filter->output.i_rate );
197             }
198             p_out += i_nb_channels;
199               i_out++;
200
201             p_sys->i_remainder += p_filter->input.i_rate;
202         }
203         p_sys->i_remainder -= p_filter->output.i_rate;
204     }
205
206     /* Take care of the current input samples (minus last one) */
207     for( i_in = 0; i_in < i_in_nb - 1; i_in++ )
208     {
209         while( p_sys->i_remainder < p_filter->output.i_rate )
210         {
211             for( i_chan = i_nb_channels ; i_chan ; )
212             {
213                 i_chan--;
214                 p_out[i_chan] = p_in[i_chan];
215                 p_out[i_chan] += ( ( p_in[i_chan + i_nb_channels]
216                     - p_in[i_chan] )
217                     * p_sys->i_remainder / p_filter->output.i_rate );
218             }
219             p_out += i_nb_channels;
220               i_out++;
221
222             p_sys->i_remainder += p_filter->input.i_rate;
223         }
224
225         p_in += i_nb_channels;
226         p_sys->i_remainder -= p_filter->output.i_rate;
227     }
228
229     /* Backup the last input sample for next time */
230     for( i_chan = i_nb_channels ; i_chan ; )
231     {
232         i_chan--;
233         p_prev_sample[i_chan] = p_in[i_chan];
234     }
235
236     p_out_buf->i_nb_samples = i_out;
237     p_out_buf->start_date = p_in_buf->start_date;
238
239     if( p_in_buf->start_date !=
240         aout_DateGet( &p_sys->end_date ) )
241     {
242         aout_DateSet( &p_sys->end_date, p_in_buf->start_date );
243     }
244
245     p_out_buf->end_date = aout_DateIncrement( &p_sys->end_date,
246                                               p_out_buf->i_nb_samples );
247
248     p_out_buf->i_nb_bytes = p_out_buf->i_nb_samples *
249         i_nb_channels * sizeof(int32_t);
250
251 #ifndef HAVE_ALLOCA
252     free( p_in_orig );
253 #endif
254
255 }
256
257 /*****************************************************************************
258  * OpenFilter:
259  *****************************************************************************/
260 static int OpenFilter( vlc_object_t *p_this )
261 {
262     filter_t *p_filter = (filter_t *)p_this;
263     filter_sys_t *p_sys;
264     int i_out_rate  = p_filter->fmt_out.audio.i_rate;
265
266     if( p_filter->fmt_in.audio.i_rate == p_filter->fmt_out.audio.i_rate ||
267         p_filter->fmt_in.i_codec != VLC_FOURCC('f','l','3','2') )
268     {
269         return VLC_EGENERIC;
270     }
271     
272     /* Allocate the memory needed to store the module's structure */
273     p_filter->p_sys = p_sys = malloc( sizeof(struct filter_sys_t) );
274     if( p_sys == NULL )
275     {
276         msg_Err( p_filter, "out of memory" );
277         return VLC_ENOMEM;
278     }
279
280     p_sys->p_prev_sample = malloc(
281         p_filter->fmt_in.audio.i_channels * sizeof(int32_t) );
282     if( p_sys->p_prev_sample == NULL )
283     {
284         msg_Err( p_filter, "out of memory" );
285         free( p_sys );
286         return VLC_ENOMEM;
287     }
288
289     p_filter->pf_audio_filter = Resample;
290
291     msg_Dbg( p_this, "%4.4s/%iKHz/%i->%4.4s/%iKHz/%i",
292              (char *)&p_filter->fmt_in.i_codec,
293              p_filter->fmt_in.audio.i_rate,
294              p_filter->fmt_in.audio.i_channels,
295              (char *)&p_filter->fmt_out.i_codec,
296              p_filter->fmt_out.audio.i_rate,
297              p_filter->fmt_out.audio.i_channels);
298
299     p_filter->fmt_out = p_filter->fmt_in;
300     p_filter->fmt_out.audio.i_rate = i_out_rate;
301
302     return 0;
303 }
304
305 /*****************************************************************************
306  * CloseFilter : deallocate data structures
307  *****************************************************************************/
308 static void CloseFilter( vlc_object_t *p_this )
309 {
310     filter_t *p_filter = (filter_t *)p_this;
311     free( p_filter->p_sys->p_prev_sample );
312     free( p_filter->p_sys );
313 }
314
315 /*****************************************************************************
316  * Resample
317  *****************************************************************************/
318 static block_t *Resample( filter_t *p_filter, block_t *p_block )
319 {
320     aout_filter_t aout_filter;
321     aout_buffer_t in_buf, out_buf;
322     block_t *p_out;
323     int i_out_size;
324     int i_bytes_per_frame;
325
326     if( !p_block || !p_block->i_samples )
327     {
328         if( p_block ) p_block->pf_release( p_block );
329         return NULL;
330     }
331     
332     i_bytes_per_frame = p_filter->fmt_out.audio.i_channels *
333                   p_filter->fmt_out.audio.i_bitspersample / 8;
334     
335     i_out_size = i_bytes_per_frame * ( 1 + (p_block->i_samples * 
336         p_filter->fmt_out.audio.i_rate / p_filter->fmt_in.audio.i_rate));
337
338     p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
339     if( !p_out )
340     {
341         msg_Warn( p_filter, "can't get output buffer" );
342         p_block->pf_release( p_block );
343         return NULL;
344     }
345
346     p_out->i_samples = i_out_size / i_bytes_per_frame;
347     p_out->i_dts = p_block->i_dts;
348     p_out->i_pts = p_block->i_pts;
349     p_out->i_length = p_block->i_length;
350
351     aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
352     aout_filter.input = p_filter->fmt_in.audio;
353     aout_filter.output = p_filter->fmt_out.audio;
354     aout_filter.b_continuity = VLC_FALSE;
355
356     in_buf.p_buffer = p_block->p_buffer;
357     in_buf.i_nb_bytes = p_block->i_buffer;
358     in_buf.i_nb_samples = p_block->i_samples;
359     out_buf.p_buffer = p_out->p_buffer;
360     out_buf.i_nb_bytes = p_out->i_buffer;
361     out_buf.i_nb_samples = p_out->i_samples;
362
363     DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
364
365     p_block->pf_release( p_block );
366     
367     p_out->i_buffer = out_buf.i_nb_bytes;
368     p_out->i_samples = out_buf.i_nb_samples;
369
370     return p_out;
371 }