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 VideoLAN
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
32 #include <stdlib.h> /* malloc(), free() */
33 #include <string.h> /* strdup() */
35 # include <stdint.h> /* int16_t .. */
37 # include <inttypes.h> /* int16_t .. */
44 #ifdef USE_A52DEC_TREE /* liba52 header file */
45 # include "include/a52.h"
47 # include "a52dec/a52.h"
50 #include <vlc/decoder.h>
51 #include "aout_internal.h"
52 #include "vlc_filter.h"
54 /*****************************************************************************
56 *****************************************************************************/
57 static int Create ( vlc_object_t * );
58 static void Destroy ( vlc_object_t * );
59 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
61 static int Open ( vlc_object_t *, filter_sys_t *,
62 audio_format_t, audio_format_t );
64 static int OpenFilter ( vlc_object_t * );
65 static void CloseFilter( vlc_object_t * );
66 static block_t *Convert( filter_t *, block_t * );
68 /* liba52 channel order */
69 static const uint32_t pi_channels_in[] =
70 { AOUT_CHAN_LFE, AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
71 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 };
72 /* our internal channel order (WG-4 order) */
73 static const uint32_t pi_channels_out[] =
74 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
75 AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
77 /*****************************************************************************
79 *****************************************************************************/
82 a52_state_t * p_liba52; /* liba52 internal structure */
83 vlc_bool_t b_dynrng; /* see below */
84 int i_flags; /* liba52 flags, see a52dec/doc/liba52.txt */
85 vlc_bool_t b_dontwarn;
86 int i_nb_channels; /* number of float32 per sample */
88 int pi_chan_table[AOUT_CHAN_MAX]; /* channel reordering */
91 /*****************************************************************************
93 *****************************************************************************/
94 #define DYNRNG_TEXT N_("A/52 dynamic range compression")
95 #define DYNRNG_LONGTEXT N_( \
96 "Dynamic range compression makes the loud sounds softer, and the soft " \
97 "sounds louder, so you can more easily listen to the stream in a noisy " \
98 "environment without disturbing anyone. If you disable the dynamic range "\
99 "compression the playback will be more adapted to a movie theater or a " \
103 set_description( _("ATSC A/52 (AC-3) audio decoder") );
104 set_category( CAT_AUDIO );
105 set_subcategory( SUBCAT_AUDIO_MISC );
106 add_bool( "a52-dynrng", 1, NULL, DYNRNG_TEXT, DYNRNG_LONGTEXT, VLC_FALSE );
107 set_capability( "audio filter", 100 );
108 set_callbacks( Create, Destroy );
111 set_description( _("ATSC A/52 (AC-3) audio decoder") );
112 set_capability( "audio filter2", 100 );
113 set_callbacks( OpenFilter, CloseFilter );
116 /*****************************************************************************
118 *****************************************************************************/
119 static int Create( vlc_object_t *p_this )
121 aout_filter_t *p_filter = (aout_filter_t *)p_this;
122 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
125 if ( p_filter->input.i_format != VLC_FOURCC('a','5','2',' ')
126 || p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
131 if ( p_filter->input.i_rate != p_filter->output.i_rate )
136 /* Allocate the memory needed to store the module's structure */
137 p_sys = malloc( sizeof(filter_sys_t) );
138 p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
141 msg_Err( p_filter, "out of memory" );
145 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
146 p_filter->input, p_filter->output );
148 p_filter->pf_do_work = DoWork;
149 p_filter->b_in_place = 0;
154 /*****************************************************************************
156 *****************************************************************************/
157 static int Open( vlc_object_t *p_this, filter_sys_t *p_sys,
158 audio_format_t input, audio_format_t output )
160 p_sys->b_dynrng = config_GetInt( p_this, "a52-dynrng" );
161 p_sys->b_dontwarn = 0;
163 /* We'll do our own downmixing, thanks. */
164 p_sys->i_nb_channels = aout_FormatNbChannels( &output );
165 switch ( (output.i_physical_channels & AOUT_CHAN_PHYSMASK)
168 case AOUT_CHAN_CENTER:
169 if ( (output.i_original_channels & AOUT_CHAN_CENTER)
170 || (output.i_original_channels
171 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
173 p_sys->i_flags = A52_MONO;
175 else if ( output.i_original_channels & AOUT_CHAN_LEFT )
177 p_sys->i_flags = A52_CHANNEL1;
181 p_sys->i_flags = A52_CHANNEL2;
185 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
186 if ( output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
188 p_sys->i_flags = A52_DOLBY;
190 else if ( input.i_original_channels == AOUT_CHAN_CENTER )
192 p_sys->i_flags = A52_MONO;
194 else if ( input.i_original_channels & AOUT_CHAN_DUALMONO )
196 p_sys->i_flags = A52_CHANNEL;
198 else if ( !(output.i_original_channels & AOUT_CHAN_RIGHT) )
200 p_sys->i_flags = A52_CHANNEL1;
202 else if ( !(output.i_original_channels & AOUT_CHAN_LEFT) )
204 p_sys->i_flags = A52_CHANNEL2;
208 p_sys->i_flags = A52_STEREO;
212 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
213 p_sys->i_flags = A52_3F;
216 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
217 p_sys->i_flags = A52_2F1R;
220 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
221 | AOUT_CHAN_REARCENTER:
222 p_sys->i_flags = A52_3F1R;
225 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
226 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
227 p_sys->i_flags = A52_2F2R;
230 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
231 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
232 p_sys->i_flags = A52_3F2R;
236 msg_Warn( p_this, "unknown sample format!" );
240 if ( output.i_physical_channels & AOUT_CHAN_LFE )
242 p_sys->i_flags |= A52_LFE;
244 p_sys->i_flags |= A52_ADJUST_LEVEL;
246 /* Initialize liba52 */
247 p_sys->p_liba52 = a52_init( 0 );
248 if( p_sys->p_liba52 == NULL )
250 msg_Err( p_this, "unable to initialize liba52" );
255 aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
256 output.i_physical_channels & AOUT_CHAN_PHYSMASK,
257 p_sys->i_nb_channels,
258 p_sys->pi_chan_table );
263 /*****************************************************************************
264 * Interleave: helper function to interleave channels
265 *****************************************************************************/
266 static void Interleave( float * p_out, const float * p_in, int i_nb_channels,
269 /* We do not only have to interleave, but also reorder the channels */
272 for ( j = 0; j < i_nb_channels; j++ )
274 for ( i = 0; i < 256; i++ )
276 p_out[i * i_nb_channels + pi_chan_table[j]] = p_in[j * 256 + i];
281 /*****************************************************************************
282 * Duplicate: helper function to duplicate a unique channel
283 *****************************************************************************/
284 static void Duplicate( float * p_out, const float * p_in )
288 for ( i = 256; i--; )
296 /*****************************************************************************
297 * Exchange: helper function to exchange left & right channels
298 *****************************************************************************/
299 static void Exchange( float * p_out, const float * p_in )
302 const float * p_first = p_in + 256;
303 const float * p_second = p_in;
305 for ( i = 0; i < 256; i++ )
307 *p_out++ = *p_first++;
308 *p_out++ = *p_second++;
312 /*****************************************************************************
313 * DoWork: decode an ATSC A/52 frame.
314 *****************************************************************************/
315 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
316 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
318 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
319 sample_t i_sample_level = 1;
320 int i_flags = p_sys->i_flags;
321 int i_bytes_per_block = 256 * p_sys->i_nb_channels
325 /* Do the actual decoding now. */
326 a52_frame( p_sys->p_liba52, p_in_buf->p_buffer,
327 &i_flags, &i_sample_level, 0 );
329 if ( (i_flags & A52_CHANNEL_MASK) != (p_sys->i_flags & A52_CHANNEL_MASK)
330 && !p_sys->b_dontwarn )
333 "liba52 couldn't do the requested downmix 0x%x->0x%x",
334 p_sys->i_flags & A52_CHANNEL_MASK,
335 i_flags & A52_CHANNEL_MASK );
337 p_sys->b_dontwarn = 1;
340 if( !p_sys->b_dynrng )
342 a52_dynrng( p_sys->p_liba52, NULL, NULL );
345 for ( i = 0; i < 6; i++ )
347 sample_t * p_samples;
349 if( a52_block( p_sys->p_liba52 ) )
351 msg_Warn( p_filter, "a52_block failed for block %d", i );
354 p_samples = a52_samples( p_sys->p_liba52 );
356 if ( ((p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL1
357 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL2
358 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_MONO)
359 && (p_filter->output.i_physical_channels
360 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
362 Duplicate( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
365 else if ( p_filter->output.i_original_channels
366 & AOUT_CHAN_REVERSESTEREO )
368 Exchange( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
373 /* Interleave the *$£%ù samples. */
374 Interleave( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
375 p_samples, p_sys->i_nb_channels, p_sys->pi_chan_table);
379 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
380 p_out_buf->i_nb_bytes = i_bytes_per_block * 6;
383 /*****************************************************************************
384 * Destroy : deallocate data structures
385 *****************************************************************************/
386 static void Destroy( vlc_object_t *p_this )
388 aout_filter_t *p_filter = (aout_filter_t *)p_this;
389 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
391 a52_free( p_sys->p_liba52 );
395 /*****************************************************************************
397 *****************************************************************************/
398 static int OpenFilter( vlc_object_t *p_this )
400 filter_t *p_filter = (filter_t *)p_this;
404 if( p_filter->fmt_in.i_codec != VLC_FOURCC('a','5','2',' ') )
409 p_filter->fmt_out.audio.i_format =
410 p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
412 /* Allocate the memory needed to store the module's structure */
413 p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
416 msg_Err( p_filter, "out of memory" );
420 /* Allocate the memory needed to store the module's structure */
421 p_filter->p_sys = p_sys = malloc( sizeof(filter_sys_t) );
424 msg_Err( p_filter, "out of memory" );
428 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
429 p_filter->fmt_in.audio, p_filter->fmt_out.audio );
431 p_filter->pf_audio_filter = Convert;
436 /*****************************************************************************
437 * CloseFilter : deallocate data structures
438 *****************************************************************************/
439 static void CloseFilter( vlc_object_t *p_this )
441 filter_t *p_filter = (filter_t *)p_this;
442 filter_sys_t *p_sys = p_filter->p_sys;
444 a52_free( p_sys->p_liba52 );
448 static block_t *Convert( filter_t *p_filter, block_t *p_block )
450 aout_filter_t aout_filter;
451 aout_buffer_t in_buf, out_buf;
455 if( !p_block || !p_block->i_samples )
457 if( p_block ) p_block->pf_release( p_block );
461 i_out_size = p_block->i_samples *
462 p_filter->fmt_out.audio.i_bitspersample *
463 p_filter->fmt_out.audio.i_channels / 8;
465 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
468 msg_Warn( p_filter, "can't get output buffer" );
469 p_block->pf_release( p_block );
473 p_out->i_samples = p_block->i_samples;
474 p_out->i_dts = p_block->i_dts;
475 p_out->i_pts = p_block->i_pts;
476 p_out->i_length = p_block->i_length;
478 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
479 aout_filter.input = p_filter->fmt_in.audio;
480 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
481 aout_filter.output = p_filter->fmt_out.audio;
482 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
484 in_buf.p_buffer = p_block->p_buffer;
485 in_buf.i_nb_bytes = p_block->i_buffer;
486 in_buf.i_nb_samples = p_block->i_samples;
487 out_buf.p_buffer = p_out->p_buffer;
488 out_buf.i_nb_bytes = p_out->i_buffer;
489 out_buf.i_nb_samples = p_out->i_samples;
491 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
493 p_out->i_buffer = out_buf.i_nb_bytes;
494 p_out->i_samples = out_buf.i_nb_samples;
496 p_block->pf_release( p_block );