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 add_bool( "a52-dynrng", 1, NULL, DYNRNG_TEXT, DYNRNG_LONGTEXT, VLC_FALSE );
105 set_capability( "audio filter", 100 );
106 set_callbacks( Create, Destroy );
109 set_description( _("ATSC A/52 (AC-3) audio decoder") );
110 set_capability( "audio filter2", 100 );
111 set_callbacks( OpenFilter, CloseFilter );
114 /*****************************************************************************
116 *****************************************************************************/
117 static int Create( vlc_object_t *p_this )
119 aout_filter_t *p_filter = (aout_filter_t *)p_this;
120 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
123 if ( p_filter->input.i_format != VLC_FOURCC('a','5','2',' ')
124 || p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
129 if ( p_filter->input.i_rate != p_filter->output.i_rate )
134 /* Allocate the memory needed to store the module's structure */
135 p_sys = malloc( sizeof(filter_sys_t) );
136 p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
139 msg_Err( p_filter, "out of memory" );
143 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
144 p_filter->input, p_filter->output );
146 p_filter->pf_do_work = DoWork;
147 p_filter->b_in_place = 0;
152 /*****************************************************************************
154 *****************************************************************************/
155 static int Open( vlc_object_t *p_this, filter_sys_t *p_sys,
156 audio_format_t input, audio_format_t output )
158 p_sys->b_dynrng = config_GetInt( p_this, "a52-dynrng" );
159 p_sys->b_dontwarn = 0;
161 /* We'll do our own downmixing, thanks. */
162 p_sys->i_nb_channels = aout_FormatNbChannels( &output );
163 switch ( (output.i_physical_channels & AOUT_CHAN_PHYSMASK)
166 case AOUT_CHAN_CENTER:
167 if ( (output.i_original_channels & AOUT_CHAN_CENTER)
168 || (output.i_original_channels
169 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
171 p_sys->i_flags = A52_MONO;
173 else if ( output.i_original_channels & AOUT_CHAN_LEFT )
175 p_sys->i_flags = A52_CHANNEL1;
179 p_sys->i_flags = A52_CHANNEL2;
183 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
184 if ( output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
186 p_sys->i_flags = A52_DOLBY;
188 else if ( input.i_original_channels == AOUT_CHAN_CENTER )
190 p_sys->i_flags = A52_MONO;
192 else if ( input.i_original_channels & AOUT_CHAN_DUALMONO )
194 p_sys->i_flags = A52_CHANNEL;
196 else if ( !(output.i_original_channels & AOUT_CHAN_RIGHT) )
198 p_sys->i_flags = A52_CHANNEL1;
200 else if ( !(output.i_original_channels & AOUT_CHAN_LEFT) )
202 p_sys->i_flags = A52_CHANNEL2;
206 p_sys->i_flags = A52_STEREO;
210 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
211 p_sys->i_flags = A52_3F;
214 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
215 p_sys->i_flags = A52_2F1R;
218 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
219 | AOUT_CHAN_REARCENTER:
220 p_sys->i_flags = A52_3F1R;
223 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
224 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
225 p_sys->i_flags = A52_2F2R;
228 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
229 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
230 p_sys->i_flags = A52_3F2R;
234 msg_Warn( p_this, "unknown sample format!" );
238 if ( output.i_physical_channels & AOUT_CHAN_LFE )
240 p_sys->i_flags |= A52_LFE;
242 p_sys->i_flags |= A52_ADJUST_LEVEL;
244 /* Initialize liba52 */
245 p_sys->p_liba52 = a52_init( 0 );
246 if( p_sys->p_liba52 == NULL )
248 msg_Err( p_this, "unable to initialize liba52" );
253 aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
254 output.i_physical_channels & AOUT_CHAN_PHYSMASK,
255 p_sys->i_nb_channels,
256 p_sys->pi_chan_table );
261 /*****************************************************************************
262 * Interleave: helper function to interleave channels
263 *****************************************************************************/
264 static void Interleave( float * p_out, const float * p_in, int i_nb_channels,
267 /* We do not only have to interleave, but also reorder the channels */
270 for ( j = 0; j < i_nb_channels; j++ )
272 for ( i = 0; i < 256; i++ )
274 p_out[i * i_nb_channels + pi_chan_table[j]] = p_in[j * 256 + i];
279 /*****************************************************************************
280 * Duplicate: helper function to duplicate a unique channel
281 *****************************************************************************/
282 static void Duplicate( float * p_out, const float * p_in )
286 for ( i = 256; i--; )
294 /*****************************************************************************
295 * Exchange: helper function to exchange left & right channels
296 *****************************************************************************/
297 static void Exchange( float * p_out, const float * p_in )
300 const float * p_first = p_in + 256;
301 const float * p_second = p_in;
303 for ( i = 0; i < 256; i++ )
305 *p_out++ = *p_first++;
306 *p_out++ = *p_second++;
310 /*****************************************************************************
311 * DoWork: decode an ATSC A/52 frame.
312 *****************************************************************************/
313 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
314 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
316 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
317 sample_t i_sample_level = 1;
318 int i_flags = p_sys->i_flags;
319 int i_bytes_per_block = 256 * p_sys->i_nb_channels
323 /* Do the actual decoding now. */
324 a52_frame( p_sys->p_liba52, p_in_buf->p_buffer,
325 &i_flags, &i_sample_level, 0 );
327 if ( (i_flags & A52_CHANNEL_MASK) != (p_sys->i_flags & A52_CHANNEL_MASK)
328 && !p_sys->b_dontwarn )
331 "liba52 couldn't do the requested downmix 0x%x->0x%x",
332 p_sys->i_flags & A52_CHANNEL_MASK,
333 i_flags & A52_CHANNEL_MASK );
335 p_sys->b_dontwarn = 1;
338 if( !p_sys->b_dynrng )
340 a52_dynrng( p_sys->p_liba52, NULL, NULL );
343 for ( i = 0; i < 6; i++ )
345 sample_t * p_samples;
347 if( a52_block( p_sys->p_liba52 ) )
349 msg_Warn( p_filter, "a52_block failed for block %d", i );
352 p_samples = a52_samples( p_sys->p_liba52 );
354 if ( ((p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL1
355 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL2
356 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_MONO)
357 && (p_filter->output.i_physical_channels
358 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
360 Duplicate( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
363 else if ( p_filter->output.i_original_channels
364 & AOUT_CHAN_REVERSESTEREO )
366 Exchange( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
371 /* Interleave the *$£%ù samples. */
372 Interleave( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
373 p_samples, p_sys->i_nb_channels, p_sys->pi_chan_table);
377 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
378 p_out_buf->i_nb_bytes = i_bytes_per_block * 6;
381 /*****************************************************************************
382 * Destroy : deallocate data structures
383 *****************************************************************************/
384 static void Destroy( vlc_object_t *p_this )
386 aout_filter_t *p_filter = (aout_filter_t *)p_this;
387 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
389 a52_free( p_sys->p_liba52 );
393 /*****************************************************************************
395 *****************************************************************************/
396 static int OpenFilter( vlc_object_t *p_this )
398 filter_t *p_filter = (filter_t *)p_this;
402 if( p_filter->fmt_in.i_codec != VLC_FOURCC('a','5','2',' ') )
407 p_filter->fmt_out.audio.i_format =
408 p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
410 /* Allocate the memory needed to store the module's structure */
411 p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
414 msg_Err( p_filter, "out of memory" );
418 /* Allocate the memory needed to store the module's structure */
419 p_filter->p_sys = p_sys = malloc( sizeof(filter_sys_t) );
422 msg_Err( p_filter, "out of memory" );
426 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
427 p_filter->fmt_in.audio, p_filter->fmt_out.audio );
429 p_filter->pf_audio_filter = Convert;
434 /*****************************************************************************
435 * CloseFilter : deallocate data structures
436 *****************************************************************************/
437 static void CloseFilter( vlc_object_t *p_this )
439 filter_t *p_filter = (filter_t *)p_this;
440 filter_sys_t *p_sys = p_filter->p_sys;
442 a52_free( p_sys->p_liba52 );
446 static block_t *Convert( filter_t *p_filter, block_t *p_block )
448 aout_filter_t aout_filter;
449 aout_buffer_t in_buf, out_buf;
453 if( !p_block || !p_block->i_samples )
455 if( p_block ) p_block->pf_release( p_block );
459 i_out_size = p_block->i_samples *
460 p_filter->fmt_out.audio.i_bitspersample *
461 p_filter->fmt_out.audio.i_channels / 8;
463 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
466 msg_Warn( p_filter, "can't get output buffer" );
467 p_block->pf_release( p_block );
471 p_out->i_samples = p_block->i_samples;
472 p_out->i_dts = p_block->i_dts;
473 p_out->i_pts = p_block->i_pts;
474 p_out->i_length = p_block->i_length;
476 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
477 aout_filter.input = p_filter->fmt_in.audio;
478 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
479 aout_filter.output = p_filter->fmt_out.audio;
480 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
482 in_buf.p_buffer = p_block->p_buffer;
483 in_buf.i_nb_bytes = p_block->i_buffer;
484 in_buf.i_nb_samples = p_block->i_samples;
485 out_buf.p_buffer = p_out->p_buffer;
486 out_buf.i_nb_bytes = p_out->i_buffer;
487 out_buf.i_nb_samples = p_out->i_samples;
489 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
491 p_out->i_buffer = out_buf.i_nb_bytes;
492 p_out->i_samples = out_buf.i_nb_samples;
494 p_block->pf_release( p_block );