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 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
38 # include <stdint.h> /* int16_t .. */
40 # include <inttypes.h> /* int16_t .. */
47 #ifdef USE_A52DEC_TREE /* liba52 header file */
48 # include "include/a52.h"
50 # include "a52dec/a52.h"
54 #include <vlc_block.h>
55 #include <vlc_filter.h>
57 /*****************************************************************************
59 *****************************************************************************/
60 static int Create ( vlc_object_t * );
61 static void Destroy ( vlc_object_t * );
62 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
64 static int Open ( vlc_object_t *, filter_sys_t *,
65 audio_format_t, audio_format_t );
67 static int OpenFilter ( vlc_object_t * );
68 static void CloseFilter( vlc_object_t * );
69 static block_t *Convert( filter_t *, block_t * );
71 /* liba52 channel order */
72 static const uint32_t pi_channels_in[] =
73 { AOUT_CHAN_LFE, AOUT_CHAN_LEFT, AOUT_CHAN_CENTER, AOUT_CHAN_RIGHT,
74 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARCENTER, AOUT_CHAN_REARRIGHT, 0 };
76 /*****************************************************************************
78 *****************************************************************************/
81 a52_state_t * p_liba52; /* liba52 internal structure */
82 bool b_dynrng; /* see below */
83 int i_flags; /* liba52 flags, see a52dec/doc/liba52.txt */
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( N_("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, false )
110 add_bool( "a52-upmix", 0, NULL, UPMIX_TEXT, UPMIX_LONGTEXT, true )
111 set_capability( "audio filter", 100 )
112 set_callbacks( Create, Destroy )
115 set_description( N_("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;
150 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
151 p_filter->input, p_filter->output );
153 p_filter->pf_do_work = DoWork;
154 p_filter->b_in_place = 0;
159 /*****************************************************************************
161 *****************************************************************************/
162 static int Open( vlc_object_t *p_this, filter_sys_t *p_sys,
163 audio_format_t input, audio_format_t output )
165 p_sys->b_dynrng = config_GetInt( p_this, "a52-dynrng" );
166 p_sys->b_dontwarn = 0;
168 /* No upmixing: it's not necessary and some other filters may want to do
170 if ( aout_FormatNbChannels( &output ) > aout_FormatNbChannels( &input ) )
172 if ( ! config_GetInt( p_this, "a52-upmix" ) )
178 /* We'll do our own downmixing, thanks. */
179 p_sys->i_nb_channels = aout_FormatNbChannels( &output );
180 switch ( (output.i_physical_channels & AOUT_CHAN_PHYSMASK)
183 case AOUT_CHAN_CENTER:
184 if ( (output.i_original_channels & AOUT_CHAN_CENTER)
185 || (output.i_original_channels
186 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
188 p_sys->i_flags = A52_MONO;
190 else if ( output.i_original_channels & AOUT_CHAN_LEFT )
192 p_sys->i_flags = A52_CHANNEL1;
196 p_sys->i_flags = A52_CHANNEL2;
200 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
201 if ( output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
203 p_sys->i_flags = A52_DOLBY;
205 else if ( input.i_original_channels == AOUT_CHAN_CENTER )
207 p_sys->i_flags = A52_MONO;
209 else if ( input.i_original_channels & AOUT_CHAN_DUALMONO )
211 p_sys->i_flags = A52_CHANNEL;
213 else if ( !(output.i_original_channels & AOUT_CHAN_RIGHT) )
215 p_sys->i_flags = A52_CHANNEL1;
217 else if ( !(output.i_original_channels & AOUT_CHAN_LEFT) )
219 p_sys->i_flags = A52_CHANNEL2;
223 p_sys->i_flags = A52_STEREO;
227 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
228 p_sys->i_flags = A52_3F;
231 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
232 p_sys->i_flags = A52_2F1R;
235 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
236 | AOUT_CHAN_REARCENTER:
237 p_sys->i_flags = A52_3F1R;
240 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
241 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
242 p_sys->i_flags = A52_2F2R;
245 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
246 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
247 p_sys->i_flags = A52_3F2R;
251 msg_Warn( p_this, "unknown sample format!" );
255 if ( output.i_physical_channels & AOUT_CHAN_LFE )
257 p_sys->i_flags |= A52_LFE;
259 p_sys->i_flags |= A52_ADJUST_LEVEL;
261 /* Initialize liba52 */
262 p_sys->p_liba52 = a52_init( 0 );
263 if( p_sys->p_liba52 == NULL )
265 msg_Err( p_this, "unable to initialize liba52" );
270 aout_CheckChannelReorder( pi_channels_in, NULL,
271 output.i_physical_channels & AOUT_CHAN_PHYSMASK,
272 p_sys->i_nb_channels,
273 p_sys->pi_chan_table );
278 /*****************************************************************************
279 * Interleave: helper function to interleave channels
280 *****************************************************************************/
281 static void Interleave( float * p_out, const float * p_in, int i_nb_channels,
284 /* We do not only have to interleave, but also reorder the channels */
287 for ( j = 0; j < i_nb_channels; j++ )
289 for ( i = 0; i < 256; i++ )
291 p_out[i * i_nb_channels + pi_chan_table[j]] = p_in[j * 256 + i];
296 /*****************************************************************************
297 * Duplicate: helper function to duplicate a unique channel
298 *****************************************************************************/
299 static void Duplicate( float * p_out, const float * p_in )
303 for ( i = 256; i--; )
311 /*****************************************************************************
312 * Exchange: helper function to exchange left & right channels
313 *****************************************************************************/
314 static void Exchange( float * p_out, const float * p_in )
317 const float * p_first = p_in + 256;
318 const float * p_second = p_in;
320 for ( i = 0; i < 256; i++ )
322 *p_out++ = *p_first++;
323 *p_out++ = *p_second++;
327 /*****************************************************************************
328 * DoWork: decode an ATSC A/52 frame.
329 *****************************************************************************/
330 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
331 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
333 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
335 sample_t i_sample_level = (1 << 24);
337 sample_t i_sample_level = 1;
339 int i_flags = p_sys->i_flags;
340 int i_bytes_per_block = 256 * p_sys->i_nb_channels
344 /* Do the actual decoding now. */
345 a52_frame( p_sys->p_liba52, p_in_buf->p_buffer,
346 &i_flags, &i_sample_level, 0 );
348 if ( (i_flags & A52_CHANNEL_MASK) != (p_sys->i_flags & A52_CHANNEL_MASK)
349 && !p_sys->b_dontwarn )
352 "liba52 couldn't do the requested downmix 0x%x->0x%x",
353 p_sys->i_flags & A52_CHANNEL_MASK,
354 i_flags & A52_CHANNEL_MASK );
356 p_sys->b_dontwarn = 1;
359 if( !p_sys->b_dynrng )
361 a52_dynrng( p_sys->p_liba52, NULL, NULL );
364 for ( i = 0; i < 6; i++ )
366 sample_t * p_samples;
368 if( a52_block( p_sys->p_liba52 ) )
370 msg_Warn( p_aout, "a52_block failed for block %d", i );
373 p_samples = a52_samples( p_sys->p_liba52 );
375 if ( ((p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL1
376 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_CHANNEL2
377 || (p_sys->i_flags & A52_CHANNEL_MASK) == A52_MONO)
378 && (p_filter->output.i_physical_channels
379 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
381 Duplicate( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
384 else if ( p_filter->output.i_original_channels
385 & AOUT_CHAN_REVERSESTEREO )
387 Exchange( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
392 /* Interleave the *$£%ù samples. */
393 Interleave( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
394 p_samples, p_sys->i_nb_channels, p_sys->pi_chan_table);
398 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
399 p_out_buf->i_nb_bytes = i_bytes_per_block * 6;
402 /*****************************************************************************
403 * Destroy : deallocate data structures
404 *****************************************************************************/
405 static void Destroy( vlc_object_t *p_this )
407 aout_filter_t *p_filter = (aout_filter_t *)p_this;
408 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
410 a52_free( p_sys->p_liba52 );
414 /*****************************************************************************
416 *****************************************************************************/
417 static int OpenFilter( vlc_object_t *p_this )
419 filter_t *p_filter = (filter_t *)p_this;
423 if( p_filter->fmt_in.i_codec != VLC_FOURCC('a','5','2',' ') )
428 p_filter->fmt_out.audio.i_format =
430 p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
432 p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
434 p_filter->fmt_out.audio.i_bitspersample =
435 aout_BitsPerSample( p_filter->fmt_out.i_codec );
437 /* Allocate the memory needed to store the module's structure */
438 p_filter->p_sys = p_sys = malloc( sizeof(filter_sys_t) );
442 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
443 p_filter->fmt_in.audio, p_filter->fmt_out.audio );
445 p_filter->pf_audio_filter = Convert;
446 p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
451 /*****************************************************************************
452 * CloseFilter : deallocate data structures
453 *****************************************************************************/
454 static void CloseFilter( vlc_object_t *p_this )
456 filter_t *p_filter = (filter_t *)p_this;
457 filter_sys_t *p_sys = p_filter->p_sys;
459 a52_free( p_sys->p_liba52 );
463 static block_t *Convert( filter_t *p_filter, block_t *p_block )
465 aout_filter_t aout_filter;
466 aout_buffer_t in_buf, out_buf;
470 if( !p_block || !p_block->i_samples )
473 block_Release( p_block );
477 i_out_size = p_block->i_samples *
478 p_filter->fmt_out.audio.i_bitspersample *
479 p_filter->fmt_out.audio.i_channels / 8;
481 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
484 msg_Warn( p_filter, "can't get output buffer" );
485 block_Release( p_block );
489 p_out->i_samples = p_block->i_samples;
490 p_out->i_dts = p_block->i_dts;
491 p_out->i_pts = p_block->i_pts;
492 p_out->i_length = p_block->i_length;
494 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
495 aout_filter.input = p_filter->fmt_in.audio;
496 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
497 aout_filter.output = p_filter->fmt_out.audio;
498 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
500 in_buf.p_buffer = p_block->p_buffer;
501 in_buf.i_nb_bytes = p_block->i_buffer;
502 in_buf.i_nb_samples = p_block->i_samples;
503 out_buf.p_buffer = p_out->p_buffer;
504 out_buf.i_nb_bytes = p_out->i_buffer;
505 out_buf.i_nb_samples = p_out->i_samples;
507 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
509 p_out->i_buffer = out_buf.i_nb_bytes;
510 p_out->i_samples = out_buf.i_nb_samples;
512 block_Release( p_block );