* modules/stream_out/transcode.c: prepare transcoder to use resampling/downmixing...
[vlc.git] / modules / audio_filter / converter / mpgatofixed32.c
1 /*****************************************************************************
2  * mpgatofixed32.c: MPEG-1 & 2 audio layer I, II, III + MPEG 2.5 decoder,
3  * using MAD (MPEG Audio Decoder)
4  *****************************************************************************
5  * Copyright (C) 2001 by Jean-Paul Saman
6  * $Id$
7  *
8  * Authors: Christophe Massiot <massiot@via.ecp.fr>
9  *          Jean-Paul Saman <jpsaman@wxs.nl>
10  *      
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  * 
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
24  *****************************************************************************/
25
26 /*****************************************************************************
27  * Preamble
28  *****************************************************************************/
29 #include <stdlib.h>                                      /* malloc(), free() */
30 #include <string.h>                                              /* strdup() */
31
32 #include <mad.h>
33
34 #include <vlc/vlc.h>
35 #include <vlc/decoder.h>
36 #include "aout_internal.h"
37 #include "vlc_filter.h"
38
39 /*****************************************************************************
40  * Local prototypes
41  *****************************************************************************/
42 static int  Create    ( vlc_object_t * );
43 static void Destroy   ( vlc_object_t * );
44 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,  
45                         aout_buffer_t * );
46
47 static int  OpenFilter ( vlc_object_t * );
48 static void CloseFilter( vlc_object_t * );
49 static block_t *Convert( filter_t *, block_t * );
50
51 /*****************************************************************************
52  * Local structures
53  *****************************************************************************/
54 struct filter_sys_t
55 {
56     struct mad_stream mad_stream;
57     struct mad_frame mad_frame;
58     struct mad_synth mad_synth;
59 };
60
61 /*****************************************************************************
62  * Module descriptor
63  *****************************************************************************/
64 vlc_module_begin();
65     set_category( CAT_AUDIO );
66     set_subcategory( SUBCAT_AUDIO_MISC );
67     set_description( _("MPEG audio decoder") );
68     set_capability( "audio filter", 100 );
69     set_callbacks( Create, Destroy );
70
71     add_submodule();
72     set_description( _("MPEG audio decoder") );
73     set_capability( "audio filter2", 100 );
74     set_callbacks( OpenFilter, CloseFilter );
75 vlc_module_end();
76
77 /*****************************************************************************
78  * Create: 
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_format != VLC_FOURCC('m','p','g','a')
86            && p_filter->input.i_format != VLC_FOURCC('m','p','g','3'))
87             || (p_filter->output.i_format != VLC_FOURCC('f','l','3','2')
88                  && p_filter->output.i_format != VLC_FOURCC('f','i','3','2')) )
89     {
90         return -1;
91     }
92
93     if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
94     {
95         return -1;
96     }
97
98     /* Allocate the memory needed to store the module's structure */
99     p_sys = malloc( sizeof(filter_sys_t) );
100     p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
101     if( p_sys == NULL )
102     {
103         msg_Err( p_filter, "out of memory" );
104         return -1;
105     }
106
107     /* Initialize libmad */
108     mad_stream_init( &p_sys->mad_stream );
109     mad_frame_init( &p_sys->mad_frame );
110     mad_synth_init( &p_sys->mad_synth );
111     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
112
113     p_filter->pf_do_work = DoWork;
114     p_filter->b_in_place = 0;
115
116     return 0;
117 }
118
119 /*****************************************************************************
120  * DoWork: decode an MPEG audio frame.
121  *****************************************************************************/
122 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
123                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
124 {
125     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
126
127     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
128     p_out_buf->i_nb_bytes = p_in_buf->i_nb_samples * sizeof(vlc_fixed_t) * 
129                                aout_FormatNbChannels( &p_filter->input );
130
131     /* Do the actual decoding now. */
132     mad_stream_buffer( &p_sys->mad_stream, p_in_buf->p_buffer,
133                        p_in_buf->i_nb_bytes );
134     if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1 )
135     {
136         msg_Dbg( p_aout, "libmad error: %s",
137                   mad_stream_errorstr( &p_sys->mad_stream ) );
138         if( p_filter->output.i_format == VLC_FOURCC('f','l','3','2') )
139         {
140             int i;
141             int i_size = p_out_buf->i_nb_bytes / sizeof(float);
142             
143             float * a = (float *)p_out_buf->p_buffer;
144             for ( i = 0 ; i < i_size ; i++ )
145                 *a++ = 0.0;
146         }
147         else
148         {
149             memset( p_out_buf->p_buffer, 0, p_out_buf->i_nb_bytes );
150         }
151         return;
152     }
153
154     mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
155
156     if ( p_filter->output.i_format == VLC_FOURCC('f','i','3','2') )
157     {
158         /* Interleave and keep buffers in mad_fixed_t format */
159         mad_fixed_t * p_samples = (mad_fixed_t *)p_out_buf->p_buffer;
160         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
161         unsigned int i_samples = p_pcm->length;
162         mad_fixed_t const * p_left = p_pcm->samples[0];
163         mad_fixed_t const * p_right = p_pcm->samples[1];
164
165         switch ( p_pcm->channels )
166         {
167         case 2:
168             if ( p_filter->output.i_original_channels == AOUT_CHAN_CENTER )
169             while ( i_samples-- )
170             {
171                 *p_samples++ = (*p_left++ >> 1) + (*p_right++ >> 1);
172             }
173             else
174             while ( i_samples-- )
175             {
176                 *p_samples++ = *p_left++;
177                 *p_samples++ = *p_right++;
178             }
179             break;
180
181         case 1:
182             p_filter->p_vlc->pf_memcpy( p_samples, p_left,
183                                         i_samples * sizeof(mad_fixed_t) );
184             break;
185
186         default:
187             msg_Err( p_aout, "cannot interleave %i channels",
188                      p_pcm->channels );
189         }
190     }
191     else
192     {
193         /* float32 */
194         float * p_samples = (float *)p_out_buf->p_buffer;
195         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
196         unsigned int i_samples = p_pcm->length;
197         mad_fixed_t const * p_left = p_pcm->samples[0];
198         mad_fixed_t const * p_right = p_pcm->samples[1];
199         float f_temp = (float)FIXED32_ONE;
200
201         switch ( p_pcm->channels )
202         {
203         case 2:
204             if ( p_filter->output.i_original_channels == AOUT_CHAN_CENTER )
205             while ( i_samples-- )
206             {
207                 *p_samples++ = (float)*p_left++ / f_temp / 2 +
208                                (float)*p_right++ / f_temp / 2;
209             }
210             else
211             while ( i_samples-- )
212             {
213                 *p_samples++ = (float)*p_left++ / f_temp;
214                 *p_samples++ = (float)*p_right++ / f_temp;
215             }
216             break;
217
218         case 1:
219             while ( i_samples-- )
220             {
221                 *p_samples++ = (float)*p_left++ / f_temp;
222             }
223             break;
224
225         default:
226             msg_Err( p_aout, "cannot interleave %i channels",
227                      p_pcm->channels );
228         }
229     }
230 }
231
232 /*****************************************************************************
233  * Destroy : deallocate data structures
234  *****************************************************************************/
235 static void Destroy( vlc_object_t *p_this )
236 {
237     aout_filter_t *p_filter = (aout_filter_t *)p_this;
238     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
239
240     mad_synth_finish( &p_sys->mad_synth );
241     mad_frame_finish( &p_sys->mad_frame );
242     mad_stream_finish( &p_sys->mad_stream );
243     free( p_sys );
244 }
245
246 /*****************************************************************************
247  * OpenFilter: 
248  *****************************************************************************/
249 static int OpenFilter( vlc_object_t *p_this )
250 {
251     filter_t *p_filter = (filter_t *)p_this;
252     filter_sys_t *p_sys;
253
254     if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
255         p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
256     {
257         return VLC_EGENERIC;
258     }
259
260     /* Allocate the memory needed to store the module's structure */
261     p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
262     if( p_sys == NULL )
263     {
264         msg_Err( p_filter, "out of memory" );
265         return -1;
266     }
267
268     p_filter->pf_audio_filter = Convert;
269
270     /* Initialize libmad */
271     mad_stream_init( &p_sys->mad_stream );
272     mad_frame_init( &p_sys->mad_frame );
273     mad_synth_init( &p_sys->mad_synth );
274     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
275
276     if( p_this->p_libvlc->i_cpu & CPU_CAPABILITY_FPU )
277         p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
278     else
279         p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
280     p_filter->fmt_out.audio.i_format = p_filter->fmt_out.i_codec;
281
282     p_filter->fmt_out.audio.i_bitspersample = sizeof(float);
283     p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
284
285     msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
286              (char *)&p_filter->fmt_in.i_codec,
287              (char *)&p_filter->fmt_out.i_codec,
288              p_filter->fmt_out.audio.i_bitspersample );
289
290     return 0;
291 }
292
293 /*****************************************************************************
294  * CloseFilter : deallocate data structures
295  *****************************************************************************/
296 static void CloseFilter( vlc_object_t *p_this )
297 {
298     filter_t *p_filter = (filter_t *)p_this;
299     filter_sys_t *p_sys = p_filter->p_sys;
300
301     mad_synth_finish( &p_sys->mad_synth );
302     mad_frame_finish( &p_sys->mad_frame );
303     mad_stream_finish( &p_sys->mad_stream );
304     free( p_sys );
305 }
306
307 static block_t *Convert( filter_t *p_filter, block_t *p_block )
308 {
309     aout_filter_t aout_filter;
310     aout_buffer_t in_buf, out_buf;
311     block_t *p_out;
312     int i_out_size;
313
314     if( !p_block || !p_block->i_samples )
315     {
316         if( p_block ) p_block->pf_release( p_block );
317         return NULL;
318     }
319
320     i_out_size = p_block->i_samples *
321       p_filter->fmt_out.audio.i_bitspersample *
322         p_filter->fmt_out.audio.i_channels / 8;
323
324     p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
325     if( !p_out )
326     {
327         msg_Warn( p_filter, "can't get output buffer" );
328         p_block->pf_release( p_block );
329         return NULL;
330     }
331
332     p_out->i_samples = p_block->i_samples;
333     p_out->i_dts = p_block->i_dts;
334     p_out->i_pts = p_block->i_pts;
335     p_out->i_length = p_block->i_length;
336
337     aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
338     aout_filter.input = p_filter->fmt_in.audio;
339     aout_filter.input.i_format = p_filter->fmt_in.i_codec;
340     aout_filter.output = p_filter->fmt_out.audio;
341     aout_filter.output.i_format = p_filter->fmt_out.i_codec;
342
343     in_buf.p_buffer = p_block->p_buffer;
344     in_buf.i_nb_bytes = p_block->i_buffer;
345     in_buf.i_nb_samples = p_block->i_samples;
346     out_buf.p_buffer = p_out->p_buffer;
347     out_buf.i_nb_bytes = p_out->i_buffer;
348     out_buf.i_nb_samples = p_out->i_samples;
349
350     DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
351
352     p_block->pf_release( p_block );
353
354     p_out->i_buffer = out_buf.i_nb_bytes;
355     p_out->i_samples = out_buf.i_nb_samples;
356
357     return p_out;
358 }