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) 2001-2005 the VideoLAN team
8 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
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.
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.
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
34 #include <vlc_block.h>
35 #include "vlc_filter.h"
37 /*****************************************************************************
39 *****************************************************************************/
40 static int Create ( vlc_object_t * );
41 static void Destroy ( vlc_object_t * );
42 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
45 static int OpenFilter ( vlc_object_t * );
46 static void CloseFilter( vlc_object_t * );
47 static block_t *Convert( filter_t *, block_t * );
49 /*****************************************************************************
51 *****************************************************************************/
54 struct mad_stream mad_stream;
55 struct mad_frame mad_frame;
56 struct mad_synth mad_synth;
61 /*****************************************************************************
63 *****************************************************************************/
65 set_category( CAT_INPUT );
66 set_subcategory( SUBCAT_INPUT_ACODEC );
67 set_description( _("MPEG audio decoder") );
68 set_capability( "audio filter", 100 );
69 set_callbacks( Create, Destroy );
72 set_description( _("MPEG audio decoder") );
73 set_capability( "audio filter2", 100 );
74 set_callbacks( OpenFilter, CloseFilter );
77 /*****************************************************************************
79 *****************************************************************************/
80 static int Create( vlc_object_t *p_this )
82 aout_filter_t *p_filter = (aout_filter_t *)p_this;
83 struct filter_sys_t *p_sys;
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')) )
93 if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
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;
103 msg_Err( p_filter, "out of memory" );
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 p_sys->i_reject_count = 0;
114 p_filter->pf_do_work = DoWork;
115 p_filter->b_in_place = 0;
120 /*****************************************************************************
121 * DoWork: decode an MPEG audio frame.
122 *****************************************************************************/
123 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
124 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
126 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
128 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
129 p_out_buf->i_nb_bytes = p_in_buf->i_nb_samples * sizeof(vlc_fixed_t) *
130 aout_FormatNbChannels( &p_filter->output );
132 /* Do the actual decoding now. */
133 mad_stream_buffer( &p_sys->mad_stream, p_in_buf->p_buffer,
134 p_in_buf->i_nb_bytes );
135 if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1 )
137 msg_Dbg( p_aout, "libmad error: %s",
138 mad_stream_errorstr( &p_sys->mad_stream ) );
139 p_sys->i_reject_count = 3;
141 else if( p_in_buf->b_discontinuity )
143 p_sys->i_reject_count = 3;
146 if( p_sys->i_reject_count > 0 )
148 if( p_filter->output.i_format == VLC_FOURCC('f','l','3','2') )
151 int i_size = p_out_buf->i_nb_bytes / sizeof(float);
153 float * a = (float *)p_out_buf->p_buffer;
154 for ( i = 0 ; i < i_size ; i++ )
159 memset( p_out_buf->p_buffer, 0, p_out_buf->i_nb_bytes );
161 p_sys->i_reject_count--;
166 mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
168 if ( p_filter->output.i_format == VLC_FOURCC('f','i','3','2') )
170 /* Interleave and keep buffers in mad_fixed_t format */
171 mad_fixed_t * p_samples = (mad_fixed_t *)p_out_buf->p_buffer;
172 struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
173 unsigned int i_samples = p_pcm->length;
174 mad_fixed_t const * p_left = p_pcm->samples[0];
175 mad_fixed_t const * p_right = p_pcm->samples[1];
177 switch ( p_pcm->channels )
180 if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
182 while ( i_samples-- )
184 *p_samples++ = (*p_left++ >> 1) + (*p_right++ >> 1);
187 else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
189 while ( i_samples-- )
191 *p_samples++ = *p_left;
192 *p_samples++ = *p_left++;
195 else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
197 while ( i_samples-- )
199 *p_samples++ = *p_right;
200 *p_samples++ = *p_right++;
205 while ( i_samples-- )
207 *p_samples++ = *p_left++;
208 *p_samples++ = *p_right++;
214 p_filter->p_libvlc->pf_memcpy( p_samples, p_left,
215 i_samples * sizeof(mad_fixed_t) );
219 msg_Err( p_aout, "cannot interleave %i channels",
226 float * p_samples = (float *)p_out_buf->p_buffer;
227 struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
228 unsigned int i_samples = p_pcm->length;
229 mad_fixed_t const * p_left = p_pcm->samples[0];
230 mad_fixed_t const * p_right = p_pcm->samples[1];
231 float f_temp = (float)FIXED32_ONE;
233 switch ( p_pcm->channels )
236 if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
238 while ( i_samples-- )
240 *p_samples++ = (float)*p_left++ / f_temp / 2 +
241 (float)*p_right++ / f_temp / 2;
244 else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
246 while ( i_samples-- )
248 *p_samples++ = (float)*p_left / f_temp;
249 *p_samples++ = (float)*p_left++ / f_temp;
252 else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
254 while ( i_samples-- )
256 *p_samples++ = (float)*p_right / f_temp;
257 *p_samples++ = (float)*p_right++ / f_temp;
262 while ( i_samples-- )
264 *p_samples++ = (float)*p_left++ / f_temp;
265 *p_samples++ = (float)*p_right++ / f_temp;
271 while ( i_samples-- )
273 *p_samples++ = (float)*p_left++ / f_temp;
278 msg_Err( p_aout, "cannot interleave %i channels",
284 /*****************************************************************************
285 * Destroy : deallocate data structures
286 *****************************************************************************/
287 static void Destroy( vlc_object_t *p_this )
289 aout_filter_t *p_filter = (aout_filter_t *)p_this;
290 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
292 mad_synth_finish( &p_sys->mad_synth );
293 mad_frame_finish( &p_sys->mad_frame );
294 mad_stream_finish( &p_sys->mad_stream );
298 /*****************************************************************************
300 *****************************************************************************/
301 static int OpenFilter( vlc_object_t *p_this )
303 filter_t *p_filter = (filter_t *)p_this;
306 if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
307 p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
312 /* Allocate the memory needed to store the module's structure */
313 p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
316 msg_Err( p_filter, "out of memory" );
319 p_sys->i_reject_count = 0;
321 p_filter->pf_audio_filter = Convert;
323 /* Initialize libmad */
324 mad_stream_init( &p_sys->mad_stream );
325 mad_frame_init( &p_sys->mad_frame );
326 mad_synth_init( &p_sys->mad_synth );
327 mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
329 if( vlc_CPU() & CPU_CAPABILITY_FPU )
330 p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
332 p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
333 p_filter->fmt_out.audio.i_format = p_filter->fmt_out.i_codec;
335 p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
337 msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
338 (char *)&p_filter->fmt_in.i_codec,
339 (char *)&p_filter->fmt_out.i_codec,
340 p_filter->fmt_in.audio.i_bitspersample );
345 /*****************************************************************************
346 * CloseFilter : deallocate data structures
347 *****************************************************************************/
348 static void CloseFilter( vlc_object_t *p_this )
350 filter_t *p_filter = (filter_t *)p_this;
351 filter_sys_t *p_sys = p_filter->p_sys;
353 mad_synth_finish( &p_sys->mad_synth );
354 mad_frame_finish( &p_sys->mad_frame );
355 mad_stream_finish( &p_sys->mad_stream );
359 static block_t *Convert( filter_t *p_filter, block_t *p_block )
361 aout_filter_t aout_filter;
362 aout_buffer_t in_buf, out_buf;
366 if( !p_block || !p_block->i_samples )
368 if( p_block ) p_block->pf_release( p_block );
372 i_out_size = p_block->i_samples *
373 p_filter->fmt_out.audio.i_bitspersample *
374 p_filter->fmt_out.audio.i_channels / 8;
376 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
379 msg_Warn( p_filter, "can't get output buffer" );
380 p_block->pf_release( p_block );
384 p_out->i_samples = p_block->i_samples;
385 p_out->i_dts = p_block->i_dts;
386 p_out->i_pts = p_block->i_pts;
387 p_out->i_length = p_block->i_length;
389 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
390 aout_filter.input = p_filter->fmt_in.audio;
391 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
392 aout_filter.output = p_filter->fmt_out.audio;
393 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
395 in_buf.p_buffer = p_block->p_buffer;
396 in_buf.b_discontinuity = VLC_FALSE;
397 in_buf.i_nb_bytes = p_block->i_buffer;
398 in_buf.i_nb_samples = p_block->i_samples;
399 out_buf.p_buffer = p_out->p_buffer;
400 out_buf.i_nb_bytes = p_out->i_buffer;
401 out_buf.i_nb_samples = p_out->i_samples;
403 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
405 p_block->pf_release( p_block );
407 p_out->i_buffer = out_buf.i_nb_bytes;
408 p_out->i_samples = out_buf.i_nb_samples;