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 *****************************************************************************/
38 #include <vlc_block.h>
39 #include "vlc_filter.h"
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Create ( vlc_object_t * );
45 static void Destroy ( vlc_object_t * );
46 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
49 static int OpenFilter ( vlc_object_t * );
50 static void CloseFilter( vlc_object_t * );
51 static block_t *Convert( filter_t *, block_t * );
53 /*****************************************************************************
55 *****************************************************************************/
58 struct mad_stream mad_stream;
59 struct mad_frame mad_frame;
60 struct mad_synth mad_synth;
65 /*****************************************************************************
67 *****************************************************************************/
69 set_category( CAT_INPUT );
70 set_subcategory( SUBCAT_INPUT_ACODEC );
71 set_description( _("MPEG audio decoder") );
72 set_capability( "audio filter", 100 );
73 set_callbacks( Create, Destroy );
76 set_description( _("MPEG audio decoder") );
77 set_capability( "audio filter2", 100 );
78 set_callbacks( OpenFilter, CloseFilter );
81 /*****************************************************************************
83 *****************************************************************************/
84 static int Create( vlc_object_t *p_this )
86 aout_filter_t *p_filter = (aout_filter_t *)p_this;
87 struct filter_sys_t *p_sys;
89 if ( (p_filter->input.i_format != VLC_FOURCC('m','p','g','a')
90 && p_filter->input.i_format != VLC_FOURCC('m','p','g','3'))
91 || (p_filter->output.i_format != VLC_FOURCC('f','l','3','2')
92 && p_filter->output.i_format != VLC_FOURCC('f','i','3','2')) )
97 if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
102 /* Allocate the memory needed to store the module's structure */
103 p_sys = malloc( sizeof(filter_sys_t) );
104 p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
107 msg_Err( p_filter, "out of memory" );
111 /* Initialize libmad */
112 mad_stream_init( &p_sys->mad_stream );
113 mad_frame_init( &p_sys->mad_frame );
114 mad_synth_init( &p_sys->mad_synth );
115 mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
116 p_sys->i_reject_count = 0;
118 p_filter->pf_do_work = DoWork;
119 p_filter->b_in_place = 0;
124 /*****************************************************************************
125 * DoWork: decode an MPEG audio frame.
126 *****************************************************************************/
127 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
128 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
130 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
132 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
133 p_out_buf->i_nb_bytes = p_in_buf->i_nb_samples * sizeof(vlc_fixed_t) *
134 aout_FormatNbChannels( &p_filter->output );
136 /* Do the actual decoding now. */
137 mad_stream_buffer( &p_sys->mad_stream, p_in_buf->p_buffer,
138 p_in_buf->i_nb_bytes );
139 if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1 )
141 msg_Dbg( p_aout, "libmad error: %s",
142 mad_stream_errorstr( &p_sys->mad_stream ) );
143 p_sys->i_reject_count = 3;
145 else if( p_in_buf->b_discontinuity )
147 p_sys->i_reject_count = 3;
150 if( p_sys->i_reject_count > 0 )
152 if( p_filter->output.i_format == VLC_FOURCC('f','l','3','2') )
155 int i_size = p_out_buf->i_nb_bytes / sizeof(float);
157 float * a = (float *)p_out_buf->p_buffer;
158 for ( i = 0 ; i < i_size ; i++ )
163 memset( p_out_buf->p_buffer, 0, p_out_buf->i_nb_bytes );
165 p_sys->i_reject_count--;
170 mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
172 if ( p_filter->output.i_format == VLC_FOURCC('f','i','3','2') )
174 /* Interleave and keep buffers in mad_fixed_t format */
175 mad_fixed_t * p_samples = (mad_fixed_t *)p_out_buf->p_buffer;
176 struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
177 unsigned int i_samples = p_pcm->length;
178 mad_fixed_t const * p_left = p_pcm->samples[0];
179 mad_fixed_t const * p_right = p_pcm->samples[1];
181 switch ( p_pcm->channels )
184 if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
186 while ( i_samples-- )
188 *p_samples++ = (*p_left++ >> 1) + (*p_right++ >> 1);
191 else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
193 while ( i_samples-- )
195 *p_samples++ = *p_left;
196 *p_samples++ = *p_left++;
199 else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
201 while ( i_samples-- )
203 *p_samples++ = *p_right;
204 *p_samples++ = *p_right++;
209 while ( i_samples-- )
211 *p_samples++ = *p_left++;
212 *p_samples++ = *p_right++;
218 p_filter->p_libvlc->pf_memcpy( p_samples, p_left,
219 i_samples * sizeof(mad_fixed_t) );
223 msg_Err( p_aout, "cannot interleave %i channels",
230 float * p_samples = (float *)p_out_buf->p_buffer;
231 struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
232 unsigned int i_samples = p_pcm->length;
233 mad_fixed_t const * p_left = p_pcm->samples[0];
234 mad_fixed_t const * p_right = p_pcm->samples[1];
235 float f_temp = (float)FIXED32_ONE;
237 switch ( p_pcm->channels )
240 if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
242 while ( i_samples-- )
244 *p_samples++ = (float)*p_left++ / f_temp / 2 +
245 (float)*p_right++ / f_temp / 2;
248 else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
250 while ( i_samples-- )
252 *p_samples++ = (float)*p_left / f_temp;
253 *p_samples++ = (float)*p_left++ / f_temp;
256 else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
258 while ( i_samples-- )
260 *p_samples++ = (float)*p_right / f_temp;
261 *p_samples++ = (float)*p_right++ / f_temp;
266 while ( i_samples-- )
268 *p_samples++ = (float)*p_left++ / f_temp;
269 *p_samples++ = (float)*p_right++ / f_temp;
275 while ( i_samples-- )
277 *p_samples++ = (float)*p_left++ / f_temp;
282 msg_Err( p_aout, "cannot interleave %i channels",
288 /*****************************************************************************
289 * Destroy : deallocate data structures
290 *****************************************************************************/
291 static void Destroy( vlc_object_t *p_this )
293 aout_filter_t *p_filter = (aout_filter_t *)p_this;
294 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
296 mad_synth_finish( &p_sys->mad_synth );
297 mad_frame_finish( &p_sys->mad_frame );
298 mad_stream_finish( &p_sys->mad_stream );
302 /*****************************************************************************
304 *****************************************************************************/
305 static int OpenFilter( vlc_object_t *p_this )
307 filter_t *p_filter = (filter_t *)p_this;
310 if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
311 p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
316 /* Allocate the memory needed to store the module's structure */
317 p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
320 msg_Err( p_filter, "out of memory" );
323 p_sys->i_reject_count = 0;
325 p_filter->pf_audio_filter = Convert;
327 /* Initialize libmad */
328 mad_stream_init( &p_sys->mad_stream );
329 mad_frame_init( &p_sys->mad_frame );
330 mad_synth_init( &p_sys->mad_synth );
331 mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
333 if( vlc_CPU() & CPU_CAPABILITY_FPU )
334 p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
336 p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
337 p_filter->fmt_out.audio.i_format = p_filter->fmt_out.i_codec;
339 p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
341 msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
342 (char *)&p_filter->fmt_in.i_codec,
343 (char *)&p_filter->fmt_out.i_codec,
344 p_filter->fmt_in.audio.i_bitspersample );
349 /*****************************************************************************
350 * CloseFilter : deallocate data structures
351 *****************************************************************************/
352 static void CloseFilter( vlc_object_t *p_this )
354 filter_t *p_filter = (filter_t *)p_this;
355 filter_sys_t *p_sys = p_filter->p_sys;
357 mad_synth_finish( &p_sys->mad_synth );
358 mad_frame_finish( &p_sys->mad_frame );
359 mad_stream_finish( &p_sys->mad_stream );
363 static block_t *Convert( filter_t *p_filter, block_t *p_block )
365 aout_filter_t aout_filter;
366 aout_buffer_t in_buf, out_buf;
370 if( !p_block || !p_block->i_samples )
372 if( p_block ) p_block->pf_release( p_block );
376 i_out_size = p_block->i_samples *
377 p_filter->fmt_out.audio.i_bitspersample *
378 p_filter->fmt_out.audio.i_channels / 8;
380 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
383 msg_Warn( p_filter, "can't get output buffer" );
384 p_block->pf_release( p_block );
388 p_out->i_samples = p_block->i_samples;
389 p_out->i_dts = p_block->i_dts;
390 p_out->i_pts = p_block->i_pts;
391 p_out->i_length = p_block->i_length;
393 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
394 aout_filter.input = p_filter->fmt_in.audio;
395 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
396 aout_filter.output = p_filter->fmt_out.audio;
397 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
399 in_buf.p_buffer = p_block->p_buffer;
400 in_buf.b_discontinuity = VLC_FALSE;
401 in_buf.i_nb_bytes = p_block->i_buffer;
402 in_buf.i_nb_samples = p_block->i_samples;
403 out_buf.p_buffer = p_out->p_buffer;
404 out_buf.i_nb_bytes = p_out->i_buffer;
405 out_buf.i_nb_samples = p_out->i_samples;
407 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
409 p_block->pf_release( p_block );
411 p_out->i_buffer = out_buf.i_nb_bytes;
412 p_out->i_samples = out_buf.i_nb_samples;