1 /*****************************************************************************
2 * a52tofloat32.c: ATSC A/52 aka AC-3 decoder plugin for VLC.
3 * This plugin makes use of liba52 to decode A/52 audio
4 * (http://liba52.sf.net/).
5 *****************************************************************************
6 * Copyright (C) 2001, 2002 the VideoLAN team
9 * Authors: Gildas Bazin <gbazin@videolan.org>
10 * Christophe Massiot <massiot@via.ecp.fr>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
32 #include <string.h> /* strdup() */
34 # include <stdint.h> /* int16_t .. */
36 # include <inttypes.h> /* int16_t .. */
43 #ifdef USE_A52DEC_TREE /* liba52 header file */
44 # include "include/a52.h"
46 # include "a52dec/a52.h"
50 #include <vlc_block.h>
51 #include <vlc_filter.h>
53 /*****************************************************************************
55 *****************************************************************************/
56 static int Create ( vlc_object_t * );
57 static void Destroy ( vlc_object_t * );
58 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
60 static int Open ( vlc_object_t *, filter_sys_t *,
61 audio_format_t, audio_format_t );
63 static int OpenFilter ( vlc_object_t * );
64 static void CloseFilter( vlc_object_t * );
65 static block_t *Convert( filter_t *, block_t * );
67 /* liba52 channel order */
68 static const uint32_t pi_channels_in[] =
69 { AOUT_CHAN_LFE, AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
70 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 };
71 /* our internal channel order (WG-4 order) */
72 static const uint32_t pi_channels_out[] =
73 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
74 AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
76 /*****************************************************************************
78 *****************************************************************************/
81 a52_state_t * p_liba52; /* liba52 internal structure */
82 vlc_bool_t b_dynrng; /* see below */
83 int i_flags; /* liba52 flags, see a52dec/doc/liba52.txt */
84 vlc_bool_t b_dontwarn;
85 int i_nb_channels; /* number of float32 per sample */
87 int pi_chan_table[AOUT_CHAN_MAX]; /* channel reordering */
90 /*****************************************************************************
92 *****************************************************************************/
93 #define DYNRNG_TEXT N_("A/52 dynamic range compression")
94 #define DYNRNG_LONGTEXT N_( \
95 "Dynamic range compression makes the loud sounds softer, and the soft " \
96 "sounds louder, so you can more easily listen to the stream in a noisy " \
97 "environment without disturbing anyone. If you disable the dynamic range "\
98 "compression the playback will be more adapted to a movie theater or a " \
100 #define UPMIX_TEXT N_("Enable internal upmixing")
101 #define UPMIX_LONGTEXT N_( \
102 "Enable the internal upmixing algorithm (not recommended).")
105 set_shortname( "A/52" );
106 set_description( _("ATSC A/52 (AC-3) audio decoder") );
107 set_category( CAT_INPUT );
108 set_subcategory( SUBCAT_INPUT_ACODEC );
109 add_bool( "a52-dynrng", 1, NULL, DYNRNG_TEXT, DYNRNG_LONGTEXT, VLC_FALSE );
110 add_bool( "a52-upmix", 0, NULL, UPMIX_TEXT, UPMIX_LONGTEXT, VLC_TRUE );
111 set_capability( "audio filter", 100 );
112 set_callbacks( Create, Destroy );
115 set_description( _("ATSC A/52 (AC-3) audio decoder") );
116 set_capability( "audio filter2", 100 );
117 set_callbacks( OpenFilter, CloseFilter );
120 /*****************************************************************************
122 *****************************************************************************/
123 static int Create( vlc_object_t *p_this )
125 aout_filter_t *p_filter = (aout_filter_t *)p_this;
126 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
129 if ( p_filter->input.i_format != VLC_FOURCC('a','5','2',' ')
131 || p_filter->output.i_format != VLC_FOURCC('f','i','3','2') )
133 || p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
139 if ( p_filter->input.i_rate != p_filter->output.i_rate )
144 /* Allocate the memory needed to store the module's structure */
145 p_sys = malloc( sizeof(filter_sys_t) );
146 p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
149 msg_Err( p_filter, "out of memory" );
153 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
154 p_filter->input, p_filter->output );
156 p_filter->pf_do_work = DoWork;
157 p_filter->b_in_place = 0;
162 /*****************************************************************************
164 *****************************************************************************/
165 static int Open( vlc_object_t *p_this, filter_sys_t *p_sys,
166 audio_format_t input, audio_format_t output )
168 p_sys->b_dynrng = config_GetInt( p_this, "a52-dynrng" );
169 p_sys->b_dontwarn = 0;
171 /* No upmixing: it's not necessary and some other filters may want to do
173 if ( aout_FormatNbChannels( &output ) > aout_FormatNbChannels( &input ) )
175 if ( ! config_GetInt( p_this, "a52-upmix" ) )
181 /* We'll do our own downmixing, thanks. */
182 p_sys->i_nb_channels = aout_FormatNbChannels( &output );
183 switch ( (output.i_physical_channels & AOUT_CHAN_PHYSMASK)
186 case AOUT_CHAN_CENTER:
187 if ( (output.i_original_channels & AOUT_CHAN_CENTER)
188 || (output.i_original_channels
189 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
191 p_sys->i_flags = A52_MONO;
193 else if ( output.i_original_channels & AOUT_CHAN_LEFT )
195 p_sys->i_flags = A52_CHANNEL1;
199 p_sys->i_flags = A52_CHANNEL2;
203 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
204 if ( output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
206 p_sys->i_flags = A52_DOLBY;
208 else if ( input.i_original_channels == AOUT_CHAN_CENTER )
210 p_sys->i_flags = A52_MONO;
212 else if ( input.i_original_channels & AOUT_CHAN_DUALMONO )
214 p_sys->i_flags = A52_CHANNEL;
216 else if ( !(output.i_original_channels & AOUT_CHAN_RIGHT) )
218 p_sys->i_flags = A52_CHANNEL1;
220 else if ( !(output.i_original_channels & AOUT_CHAN_LEFT) )
222 p_sys->i_flags = A52_CHANNEL2;
226 p_sys->i_flags = A52_STEREO;
230 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
231 p_sys->i_flags = A52_3F;
234 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
235 p_sys->i_flags = A52_2F1R;
238 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
239 | AOUT_CHAN_REARCENTER:
240 p_sys->i_flags = A52_3F1R;
243 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
244 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
245 p_sys->i_flags = A52_2F2R;
248 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
249 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
250 p_sys->i_flags = A52_3F2R;
254 msg_Warn( p_this, "unknown sample format!" );
258 if ( output.i_physical_channels & AOUT_CHAN_LFE )
260 p_sys->i_flags |= A52_LFE;
262 p_sys->i_flags |= A52_ADJUST_LEVEL;
264 /* Initialize liba52 */
265 p_sys->p_liba52 = a52_init( 0 );
266 if( p_sys->p_liba52 == NULL )
268 msg_Err( p_this, "unable to initialize liba52" );
273 aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
274 output.i_physical_channels & AOUT_CHAN_PHYSMASK,
275 p_sys->i_nb_channels,
276 p_sys->pi_chan_table );
281 /*****************************************************************************
282 * Interleave: helper function to interleave channels
283 *****************************************************************************/
284 static void Interleave( float * p_out, const float * p_in, int i_nb_channels,
287 /* We do not only have to interleave, but also reorder the channels */
290 for ( j = 0; j < i_nb_channels; j++ )
292 for ( i = 0; i < 256; i++ )
294 p_out[i * i_nb_channels + pi_chan_table[j]] = p_in[j * 256 + i];
299 /*****************************************************************************
300 * Duplicate: helper function to duplicate a unique channel
301 *****************************************************************************/
302 static void Duplicate( float * p_out, const float * p_in )
306 for ( i = 256; i--; )
314 /*****************************************************************************
315 * Exchange: helper function to exchange left & right channels
316 *****************************************************************************/
317 static void Exchange( float * p_out, const float * p_in )
320 const float * p_first = p_in + 256;
321 const float * p_second = p_in;
323 for ( i = 0; i < 256; i++ )
325 *p_out++ = *p_first++;
326 *p_out++ = *p_second++;
330 /*****************************************************************************
331 * DoWork: decode an ATSC A/52 frame.
332 *****************************************************************************/
333 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
334 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
336 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
338 sample_t i_sample_level = (1 << 24);
340 sample_t i_sample_level = 1;
342 int i_flags = p_sys->i_flags;
343 int i_bytes_per_block = 256 * p_sys->i_nb_channels
347 /* Do the actual decoding now. */
348 a52_frame( p_sys->p_liba52, p_in_buf->p_buffer,
349 &i_flags, &i_sample_level, 0 );
351 if ( (i_flags & A52_CHANNEL_MASK) != (p_sys->i_flags & A52_CHANNEL_MASK)
352 && !p_sys->b_dontwarn )
355 "liba52 couldn't do the requested downmix 0x%x->0x%x",
356 p_sys->i_flags & A52_CHANNEL_MASK,
357 i_flags & A52_CHANNEL_MASK );
359 p_sys->b_dontwarn = 1;
362 if( !p_sys->b_dynrng )
364 a52_dynrng( p_sys->p_liba52, NULL, NULL );
367 for ( i = 0; i < 6; i++ )
369 sample_t * p_samples;
371 if( a52_block( p_sys->p_liba52 ) )
373 msg_Warn( p_aout, "a52_block failed for block %d", i );
376 p_samples = a52_samples( p_sys->p_liba52 );
378 if ( ((p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL1
379 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL2
380 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_MONO)
381 && (p_filter->output.i_physical_channels
382 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
384 Duplicate( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
387 else if ( p_filter->output.i_original_channels
388 & AOUT_CHAN_REVERSESTEREO )
390 Exchange( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
395 /* Interleave the *$£%ù samples. */
396 Interleave( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
397 p_samples, p_sys->i_nb_channels, p_sys->pi_chan_table);
401 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
402 p_out_buf->i_nb_bytes = i_bytes_per_block * 6;
405 /*****************************************************************************
406 * Destroy : deallocate data structures
407 *****************************************************************************/
408 static void Destroy( vlc_object_t *p_this )
410 aout_filter_t *p_filter = (aout_filter_t *)p_this;
411 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
413 a52_free( p_sys->p_liba52 );
417 /*****************************************************************************
419 *****************************************************************************/
420 static int OpenFilter( vlc_object_t *p_this )
422 filter_t *p_filter = (filter_t *)p_this;
426 if( p_filter->fmt_in.i_codec != VLC_FOURCC('a','5','2',' ') )
431 p_filter->fmt_out.audio.i_format =
433 p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
435 p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
438 /* Allocate the memory needed to store the module's structure */
439 p_filter->p_sys = p_sys = malloc( sizeof(filter_sys_t) );
442 msg_Err( p_filter, "out of memory" );
446 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
447 p_filter->fmt_in.audio, p_filter->fmt_out.audio );
449 p_filter->pf_audio_filter = Convert;
450 p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
455 /*****************************************************************************
456 * CloseFilter : deallocate data structures
457 *****************************************************************************/
458 static void CloseFilter( vlc_object_t *p_this )
460 filter_t *p_filter = (filter_t *)p_this;
461 filter_sys_t *p_sys = p_filter->p_sys;
463 a52_free( p_sys->p_liba52 );
467 static block_t *Convert( filter_t *p_filter, block_t *p_block )
469 aout_filter_t aout_filter;
470 aout_buffer_t in_buf, out_buf;
474 if( !p_block || !p_block->i_samples )
476 if( p_block ) p_block->pf_release( p_block );
480 i_out_size = p_block->i_samples *
481 p_filter->fmt_out.audio.i_bitspersample *
482 p_filter->fmt_out.audio.i_channels / 8;
484 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
487 msg_Warn( p_filter, "can't get output buffer" );
488 p_block->pf_release( p_block );
492 p_out->i_samples = p_block->i_samples;
493 p_out->i_dts = p_block->i_dts;
494 p_out->i_pts = p_block->i_pts;
495 p_out->i_length = p_block->i_length;
497 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
498 aout_filter.input = p_filter->fmt_in.audio;
499 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
500 aout_filter.output = p_filter->fmt_out.audio;
501 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
503 in_buf.p_buffer = p_block->p_buffer;
504 in_buf.i_nb_bytes = p_block->i_buffer;
505 in_buf.i_nb_samples = p_block->i_samples;
506 out_buf.p_buffer = p_out->p_buffer;
507 out_buf.i_nb_bytes = p_out->i_buffer;
508 out_buf.i_nb_samples = p_out->i_samples;
510 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
512 p_out->i_buffer = out_buf.i_nb_bytes;
513 p_out->i_samples = out_buf.i_nb_samples;
515 p_block->pf_release( p_block );