1 /*****************************************************************************
2 * dtstofloat32.c: DTS Coherent Acoustics decoder plugin for VLC.
3 * This plugin makes use of libdca to do the actual decoding
4 * (http://developers.videolan.org/libdca.html).
5 *****************************************************************************
6 * Copyright (C) 2001, 2002libdca the VideoLAN team
9 * Author: Gildas Bazin <gbazin@videolan.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 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
37 #include <dca.h> /* libdca header file */
40 #include <vlc_block.h>
41 #include <vlc_filter.h>
43 /*****************************************************************************
45 *****************************************************************************/
46 static int OpenFilter ( vlc_object_t * );
47 static void CloseFilter( vlc_object_t * );
48 static block_t *Convert( filter_t *, block_t * );
50 /* libdca channel order
51 * libdca currently only decodes 5.1, even if you have a DTS-ES source. */
52 static const uint32_t pi_channels_in[] =
53 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
54 AOUT_CHAN_REARCENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
58 /*****************************************************************************
60 *****************************************************************************/
63 dca_state_t * p_libdca; /* libdca internal structure */
64 bool b_dynrng; /* see below */
65 int i_flags; /* libdca flags, see dtsdec/doc/libdts.txt */
67 int i_nb_channels; /* number of float32 per sample */
69 int pi_chan_table[AOUT_CHAN_MAX]; /* channel reordering */
72 /*****************************************************************************
74 *****************************************************************************/
75 #define DYNRNG_TEXT N_("DTS dynamic range compression")
76 #define DYNRNG_LONGTEXT N_( \
77 "Dynamic range compression makes the loud sounds softer, and the soft " \
78 "sounds louder, so you can more easily listen to the stream in a noisy " \
79 "environment without disturbing anyone. If you disable the dynamic range "\
80 "compression the playback will be more adapted to a movie theater or a " \
84 set_category( CAT_INPUT )
85 set_subcategory( SUBCAT_INPUT_ACODEC )
86 set_shortname( "DCA" )
87 set_description( N_("DTS Coherent Acoustics audio decoder") )
88 add_bool( "dts-dynrng", true, NULL, DYNRNG_TEXT, DYNRNG_LONGTEXT, false )
89 set_capability( "audio filter", 100 )
90 set_callbacks( OpenFilter, CloseFilter )
93 /*****************************************************************************
95 *****************************************************************************/
96 static int Open( vlc_object_t *p_this, filter_sys_t *p_sys,
97 audio_format_t input, audio_format_t output )
99 p_sys->b_dynrng = var_InheritBool( p_this, "dts-dynrng" );
100 p_sys->b_dontwarn = 0;
102 /* We'll do our own downmixing, thanks. */
103 p_sys->i_nb_channels = aout_FormatNbChannels( &output );
104 switch ( (output.i_physical_channels & AOUT_CHAN_PHYSMASK)
107 case AOUT_CHAN_CENTER:
108 if ( (output.i_original_channels & AOUT_CHAN_CENTER)
109 || (output.i_original_channels
110 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
112 p_sys->i_flags = DCA_MONO;
116 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
117 if ( output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
119 p_sys->i_flags = DCA_DOLBY;
121 else if ( input.i_original_channels == AOUT_CHAN_CENTER )
123 p_sys->i_flags = DCA_MONO;
125 else if ( input.i_original_channels & AOUT_CHAN_DUALMONO )
127 p_sys->i_flags = DCA_CHANNEL;
131 p_sys->i_flags = DCA_STEREO;
135 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
136 p_sys->i_flags = DCA_3F;
139 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
140 p_sys->i_flags = DCA_2F1R;
143 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
144 | AOUT_CHAN_REARCENTER:
145 p_sys->i_flags = DCA_3F1R;
148 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
149 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
150 p_sys->i_flags = DCA_2F2R;
153 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
154 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
155 p_sys->i_flags = DCA_3F2R;
159 msg_Warn( p_this, "unknown sample format!" );
163 if ( output.i_physical_channels & AOUT_CHAN_LFE )
165 p_sys->i_flags |= DCA_LFE;
167 //p_sys->i_flags |= DCA_ADJUST_LEVEL;
169 /* Initialize libdca */
170 p_sys->p_libdca = dca_init( 0 );
171 if( p_sys->p_libdca == NULL )
173 msg_Err( p_this, "unable to initialize libdca" );
177 aout_CheckChannelReorder( pi_channels_in, NULL,
178 output.i_physical_channels & AOUT_CHAN_PHYSMASK,
179 p_sys->i_nb_channels,
180 p_sys->pi_chan_table );
185 /*****************************************************************************
186 * Interleave: helper function to interleave channels
187 *****************************************************************************/
188 static void Interleave( float * p_out, const float * p_in, int i_nb_channels,
191 /* We do not only have to interleave, but also reorder the channels. */
194 for ( j = 0; j < i_nb_channels; j++ )
196 for ( i = 0; i < 256; i++ )
198 p_out[i * i_nb_channels + pi_chan_table[j]] = p_in[j * 256 + i];
203 /*****************************************************************************
204 * Duplicate: helper function to duplicate a unique channel
205 *****************************************************************************/
206 static void Duplicate( float * p_out, const float * p_in )
210 for ( i = 256; i--; )
218 /*****************************************************************************
219 * Exchange: helper function to exchange left & right channels
220 *****************************************************************************/
221 static void Exchange( float * p_out, const float * p_in )
224 const float * p_first = p_in + 256;
225 const float * p_second = p_in;
227 for ( i = 0; i < 256; i++ )
229 *p_out++ = *p_first++;
230 *p_out++ = *p_second++;
234 /*****************************************************************************
235 * DoWork: decode a DTS frame.
236 *****************************************************************************/
237 static void DoWork( filter_t * p_filter,
238 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
240 filter_sys_t *p_sys = p_filter->p_sys;
241 sample_t i_sample_level = 1;
242 int i_flags = p_sys->i_flags;
243 int i_bytes_per_block = 256 * p_sys->i_nb_channels
248 * Do the actual decoding now.
251 /* Needs to be called so the decoder knows which type of bitstream it is
253 int i_sample_rate, i_bit_rate, i_frame_length;
254 if( !dca_syncinfo( p_sys->p_libdca, p_in_buf->p_buffer, &i_flags,
255 &i_sample_rate, &i_bit_rate, &i_frame_length ) )
257 msg_Warn( p_filter, "libdca couldn't sync on frame" );
258 p_out_buf->i_nb_samples = p_out_buf->i_buffer = 0;
262 i_flags = p_sys->i_flags;
263 dca_frame( p_sys->p_libdca, p_in_buf->p_buffer,
264 &i_flags, &i_sample_level, 0 );
266 if ( (i_flags & DCA_CHANNEL_MASK) != (p_sys->i_flags & DCA_CHANNEL_MASK)
267 && !p_sys->b_dontwarn )
270 "libdca couldn't do the requested downmix 0x%x->0x%x",
271 p_sys->i_flags & DCA_CHANNEL_MASK,
272 i_flags & DCA_CHANNEL_MASK );
274 p_sys->b_dontwarn = 1;
277 if( 0)//!p_sys->b_dynrng )
279 dca_dynrng( p_sys->p_libdca, NULL, NULL );
282 for ( i = 0; i < dca_blocks_num(p_sys->p_libdca); i++ )
284 sample_t * p_samples;
286 if( dca_block( p_sys->p_libdca ) )
288 msg_Warn( p_filter, "dca_block failed for block %d", i );
292 p_samples = dca_samples( p_sys->p_libdca );
294 if ( (p_sys->i_flags & DCA_CHANNEL_MASK) == DCA_MONO
295 && (p_filter->fmt_out.audio.i_physical_channels
296 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
298 Duplicate( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
301 else if ( p_filter->fmt_out.audio.i_original_channels
302 & AOUT_CHAN_REVERSESTEREO )
304 Exchange( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
309 /* Interleave the *$£%ù samples. */
310 Interleave( (float *)(p_out_buf->p_buffer + i * i_bytes_per_block),
311 p_samples, p_sys->i_nb_channels, p_sys->pi_chan_table);
315 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
316 p_out_buf->i_buffer = i_bytes_per_block * i;
319 /*****************************************************************************
321 *****************************************************************************/
322 static int OpenFilter( vlc_object_t *p_this )
324 filter_t *p_filter = (filter_t *)p_this;
328 if( p_filter->fmt_in.i_codec != VLC_CODEC_DTS ||
329 p_filter->fmt_out.audio.i_format == VLC_CODEC_SPDIFB ||
330 p_filter->fmt_out.audio.i_format == VLC_CODEC_SPDIFL )
335 p_filter->fmt_out.audio.i_format =
336 p_filter->fmt_out.i_codec = VLC_CODEC_FL32;
337 p_filter->fmt_out.audio.i_bitspersample =
338 aout_BitsPerSample( p_filter->fmt_out.i_codec );
340 /* Allocate the memory needed to store the module's structure */
341 p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
345 i_ret = Open( VLC_OBJECT(p_filter), p_sys,
346 p_filter->fmt_in.audio, p_filter->fmt_out.audio );
348 p_filter->pf_audio_filter = Convert;
349 p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
354 /*****************************************************************************
355 * CloseFilter : deallocate data structures
356 *****************************************************************************/
357 static void CloseFilter( vlc_object_t *p_this )
359 filter_t *p_filter = (filter_t *)p_this;
360 filter_sys_t *p_sys = p_filter->p_sys;
362 dca_free( p_sys->p_libdca );
366 static block_t *Convert( filter_t *p_filter, block_t *p_block )
368 if( !p_block || !p_block->i_nb_samples )
371 block_Release( p_block );
375 size_t i_out_size = p_block->i_nb_samples *
376 p_filter->fmt_out.audio.i_bitspersample *
377 p_filter->fmt_out.audio.i_channels / 8;
379 block_t *p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
382 msg_Warn( p_filter, "can't get output buffer" );
383 block_Release( p_block );
387 p_out->i_nb_samples = p_block->i_nb_samples;
388 p_out->i_dts = p_block->i_dts;
389 p_out->i_pts = p_block->i_pts;
390 p_out->i_length = p_block->i_length;
392 DoWork( p_filter, p_block, p_out );
394 block_Release( p_block );