1 /*****************************************************************************
2 * lpcm.c: lpcm decoder/packetizer module
3 *****************************************************************************
4 * Copyright (C) 1999-2008 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Henri Fallon <henri@videolan.org>
9 * Christophe Massiot <massiot@via.ecp.fr>
10 * Gildas Bazin <gbazin@videolan.org>
11 * Lauren Aimar <fenrir _AT_ videolan _DOT_ org >
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
26 *****************************************************************************/
28 /*****************************************************************************
30 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
37 #include <vlc_codec.h>
41 /*****************************************************************************
43 *****************************************************************************/
44 static int OpenDecoder ( vlc_object_t * );
45 static int OpenPacketizer( vlc_object_t * );
46 static void CloseCommon ( vlc_object_t * );
50 set_category( CAT_INPUT )
51 set_subcategory( SUBCAT_INPUT_ACODEC )
52 set_description( N_("Linear PCM audio decoder") )
53 set_capability( "decoder", 100 )
54 set_callbacks( OpenDecoder, CloseCommon )
57 set_description( N_("Linear PCM audio packetizer") )
58 set_capability( "packetizer", 100 )
59 set_callbacks( OpenPacketizer, CloseCommon )
64 /*****************************************************************************
65 * decoder_sys_t : lpcm decoder descriptor
66 *****************************************************************************/
75 audio_date_t end_date;
78 unsigned i_header_size;
84 * - frame number (8 bits)
85 * - unknown (16 bits) == 0x0003 ?
87 * - current frame (4 bits)
89 * - frequency (2 bits) 0 == 48 kHz, 1 == 32 kHz, 2 == ?, 3 == ?
91 * - number of channels - 1 (3 bits) 1 == 2 channels
92 * - start code (8 bits) == 0x80
96 * - number of channels (4 bits)
97 * - frequency (4 bits)
98 * - bits per sample (2 bits)
102 #define LPCM_DVD_HEADER_LEN (6)
103 #define LPCM_BD_HEADER_LEN (4)
105 /*****************************************************************************
107 *****************************************************************************/
108 static void *DecodeFrame ( decoder_t *, block_t ** );
109 static int DvdHeader( unsigned *pi_rate,
110 unsigned *pi_channels, unsigned *pi_original_channels,
112 const uint8_t *p_header );
113 static void DvdExtract( aout_buffer_t *, block_t *, unsigned i_bits );
115 static int BdHeader( unsigned *pi_rate,
116 unsigned *pi_channels, unsigned *pi_original_channels,
118 const uint8_t *p_header );
119 static void BdExtract( aout_buffer_t *, block_t * );
122 /*****************************************************************************
124 *****************************************************************************/
125 static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
127 decoder_t *p_dec = (decoder_t*)p_this;
128 decoder_sys_t *p_sys;
131 switch( p_dec->fmt_in.i_codec )
134 case VLC_CODEC_DVD_LPCM:
135 case VLC_FOURCC('l','p','c','b'):
139 case VLC_CODEC_BD_LPCM:
146 /* Allocate the memory needed to store the decoder's structure */
147 if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
151 p_sys->b_packetizer = b_packetizer;
152 aout_DateSet( &p_sys->end_date, 0 );
153 p_sys->i_header_size = b_dvd ? LPCM_DVD_HEADER_LEN : LPCM_BD_HEADER_LEN;
154 p_sys->b_dvd = b_dvd;
156 /* Set output properties */
157 p_dec->fmt_out.i_cat = AUDIO_ES;
161 p_dec->fmt_out.i_codec = b_dvd ? VLC_CODEC_DVD_LPCM : VLC_CODEC_BD_LPCM;
165 switch( p_dec->fmt_out.audio.i_bitspersample )
169 p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
170 p_dec->fmt_out.audio.i_bitspersample = 24;
173 p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
174 p_dec->fmt_out.audio.i_bitspersample = 16;
180 p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
182 p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
187 static int OpenDecoder( vlc_object_t *p_this )
189 return OpenCommon( p_this, false );
191 static int OpenPacketizer( vlc_object_t *p_this )
193 return OpenCommon( p_this, true );
196 /*****************************************************************************
197 * DecodeFrame: decodes an lpcm frame.
198 ****************************************************************************
199 * Beware, this function must be fed with complete frames (PES packet).
200 *****************************************************************************/
201 static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
203 decoder_sys_t *p_sys = p_dec->p_sys;
205 unsigned int i_rate = 0, i_original_channels = 0, i_channels = 0, i_bits = 0;
208 if( !pp_block || !*pp_block ) return NULL;
211 *pp_block = NULL; /* So the packet doesn't get re-sent */
213 /* Date management */
214 if( p_block->i_pts > 0 &&
215 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
217 aout_DateSet( &p_sys->end_date, p_block->i_pts );
220 if( !aout_DateGet( &p_sys->end_date ) )
222 /* We've just started the stream, wait for the first PTS. */
223 block_Release( p_block );
227 if( p_block->i_buffer <= p_sys->i_header_size )
229 msg_Err(p_dec, "frame is too short");
230 block_Release( p_block );
236 i_ret = DvdHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
239 i_ret = BdHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
244 msg_Warn( p_dec, "no frame sync" );
245 block_Release( p_block );
249 /* Set output properties */
250 if( p_dec->fmt_out.audio.i_rate != i_rate )
252 aout_DateInit( &p_sys->end_date, i_rate );
253 aout_DateSet( &p_sys->end_date, p_block->i_pts );
255 p_dec->fmt_out.audio.i_rate = i_rate;
256 p_dec->fmt_out.audio.i_channels = i_channels;
257 p_dec->fmt_out.audio.i_original_channels = i_original_channels;
258 p_dec->fmt_out.audio.i_physical_channels = i_original_channels & AOUT_CHAN_PHYSMASK;
260 i_frame_length = (p_block->i_buffer - p_sys->i_header_size) / i_channels * 8 / i_bits;
262 if( p_sys->b_packetizer )
264 p_block->i_pts = p_block->i_dts = aout_DateGet( &p_sys->end_date );
266 aout_DateIncrement( &p_sys->end_date, i_frame_length ) -
269 /* Just pass on the incoming frame */
277 p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
278 p_dec->fmt_out.audio.i_bitspersample = 16;
282 p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
283 p_dec->fmt_out.audio.i_bitspersample = 24;
287 aout_buffer_t *p_aout_buffer;
288 p_aout_buffer = decoder_NewAudioBuffer( p_dec, i_frame_length );
292 p_aout_buffer->start_date = aout_DateGet( &p_sys->end_date );
293 p_aout_buffer->end_date =
294 aout_DateIncrement( &p_sys->end_date, i_frame_length );
296 p_block->p_buffer += p_sys->i_header_size;
297 p_block->i_buffer -= p_sys->i_header_size;
300 DvdExtract( p_aout_buffer, p_block, i_bits );
302 BdExtract( p_aout_buffer, p_block );
304 block_Release( p_block );
305 return p_aout_buffer;
309 /*****************************************************************************
310 * CloseCommon : lpcm decoder destruction
311 *****************************************************************************/
312 static void CloseCommon( vlc_object_t *p_this )
314 decoder_t *p_dec = (decoder_t*)p_this;
315 free( p_dec->p_sys );
318 /*****************************************************************************
320 *****************************************************************************/
321 static int DvdHeader( unsigned *pi_rate,
322 unsigned *pi_channels, unsigned *pi_original_channels,
324 const uint8_t *p_header )
326 const uint8_t i_header = p_header[4];
328 switch( (i_header >> 4) & 0x3 )
344 *pi_channels = (i_header & 0x7) + 1;
345 switch( *pi_channels - 1 )
348 *pi_original_channels = AOUT_CHAN_CENTER;
351 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
354 /* This is unsure. */
355 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
358 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
359 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
362 /* This is unsure. */
363 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
364 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
368 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
369 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
370 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
373 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
374 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
375 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
376 | AOUT_CHAN_MIDDLERIGHT;
379 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
380 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
381 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
382 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
386 switch( (i_header >> 6) & 0x3 )
400 /* Check frame sync and drop it. */
401 if( p_header[5] != 0x80 )
405 static int BdHeader( unsigned *pi_rate,
406 unsigned *pi_channels, unsigned *pi_original_channels,
408 const uint8_t *p_header )
410 const uint32_t h = GetDWBE( p_header );
411 switch( ( h & 0xf000) >> 12 )
415 *pi_original_channels = AOUT_CHAN_CENTER;
419 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
423 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
427 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
431 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
432 AOUT_CHAN_REARCENTER;
436 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
437 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
441 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
442 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
446 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
447 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
452 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
453 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
454 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
458 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
459 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
460 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
467 switch( (h >> 6) & 0x03 )
472 case 2: /* 20 bits but samples are stored on 24 bits */
473 case 3: /* 24 bits */
479 switch( (h >> 8) & 0x0f )
496 static void DvdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
499 uint8_t *p_out = p_aout_buffer->p_buffer;
501 /* 20/24 bits LPCM use special packing */
504 while( p_block->i_buffer / 12 )
507 p_out[0] = p_block->p_buffer[0];
508 p_out[1] = p_block->p_buffer[1];
509 p_out[2] = p_block->p_buffer[8];
511 p_out[3] = p_block->p_buffer[2];
512 p_out[4] = p_block->p_buffer[3];
513 p_out[5] = p_block->p_buffer[9];
515 p_out[6] = p_block->p_buffer[4];
516 p_out[7] = p_block->p_buffer[5];
517 p_out[8] = p_block->p_buffer[10];
519 p_out[9] = p_block->p_buffer[6];
520 p_out[10] = p_block->p_buffer[7];
521 p_out[11] = p_block->p_buffer[11];
523 p_block->i_buffer -= 12;
524 p_block->p_buffer += 12;
528 else if( i_bits == 20 )
530 while( p_block->i_buffer / 10 )
533 p_out[0] = p_block->p_buffer[0];
534 p_out[1] = p_block->p_buffer[1];
535 p_out[2] = p_block->p_buffer[8] & 0xF0;
537 p_out[3] = p_block->p_buffer[2];
538 p_out[4] = p_block->p_buffer[3];
539 p_out[5] = p_block->p_buffer[8] << 4;
541 p_out[6] = p_block->p_buffer[4];
542 p_out[7] = p_block->p_buffer[5];
543 p_out[8] = p_block->p_buffer[9] & 0xF0;
545 p_out[9] = p_block->p_buffer[6];
546 p_out[10] = p_block->p_buffer[7];
547 p_out[11] = p_block->p_buffer[9] << 4;
549 p_block->i_buffer -= 10;
550 p_block->p_buffer += 10;
556 assert( i_bits == 16 );
557 memcpy( p_out, p_block->p_buffer, p_block->i_buffer );
560 static void BdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block )
562 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );