1 /*****************************************************************************
2 * audio_decoder.c: MPEG1 Layer I-II audio decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public
19 * License along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
22 *****************************************************************************/
27 * - optimiser les NeedBits() et les GetBits() du code là où c'est possible ;
28 * - vlc_cond_signal() / vlc_cond_wait() ;
32 /*****************************************************************************
34 *****************************************************************************/
35 #include <unistd.h> /* getpid() */
37 #include <stdio.h> /* "intf_msg.h" */
38 #include <stdlib.h> /* malloc(), free() */
39 #include <sys/types.h> /* on BSD, uio.h needs types.h */
40 #include <sys/uio.h> /* "input.h" */
47 #include "debug.h" /* "input_netlist.h" */
49 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
51 #include "input.h" /* pes_packet_t */
52 #include "input_netlist.h" /* input_NetlistFreePES() */
53 #include "decoder_fifo.h" /* DECODER_FIFO_(ISEMPTY|START|INCSTART)() */
55 #include "audio_output.h" /* aout_fifo_t (for audio_decoder.h) */
57 #include "audio_constants.h"
58 #include "audio_decoder.h"
59 #include "audio_math.h" /* DCT32(), PCM() */
61 /*****************************************************************************
63 *****************************************************************************/
64 static int InitThread ( adec_thread_t * p_adec );
65 static void RunThread ( adec_thread_t * p_adec );
66 static void ErrorThread ( adec_thread_t * p_adec );
67 static void EndThread ( adec_thread_t * p_adec );
70 static int adec_Layer1_Mono ( adec_thread_t * p_adec );
71 static int adec_Layer1_Stereo ( adec_thread_t * p_adec );
72 static int adec_Layer2_Mono ( adec_thread_t * p_adec );
73 static int adec_Layer2_Stereo ( adec_thread_t * p_adec );
75 static byte_t GetByte ( bit_stream_t * p_bit_stream );
76 static void NeedBits ( bit_stream_t * p_bit_stream, int i_bits );
77 static void DumpBits ( bit_stream_t * p_bit_stream, int i_bits );
78 static int FindHeader ( adec_thread_t * p_adec );
81 /*****************************************************************************
82 * adec_CreateThread: creates an audio decoder thread
83 *****************************************************************************
84 * This function creates a new audio decoder thread, and returns a pointer to
85 * its description. On error, it returns NULL.
86 *****************************************************************************/
87 adec_thread_t * adec_CreateThread( input_thread_t * p_input )
89 adec_thread_t * p_adec;
91 intf_DbgMsg("adec debug: creating audio decoder thread\n");
93 /* Allocate the memory needed to store the thread's structure */
94 if ( (p_adec = (adec_thread_t *)malloc( sizeof(adec_thread_t) )) == NULL )
96 intf_ErrMsg("adec error: not enough memory for adec_CreateThread() to create the new thread\n");
101 * Initialize the thread properties
107 * Initialize the input properties
109 /* Initialize the decoder fifo's data lock and conditional variable and set
110 * its buffer as empty */
111 vlc_mutex_init( &p_adec->fifo.data_lock );
112 vlc_cond_init( &p_adec->fifo.data_wait );
113 p_adec->fifo.i_start = 0;
114 p_adec->fifo.i_end = 0;
115 /* Initialize the bit stream structure */
116 p_adec->bit_stream.p_input = p_input;
117 p_adec->bit_stream.p_decoder_fifo = &p_adec->fifo;
118 p_adec->bit_stream.fifo.buffer = 0;
119 p_adec->bit_stream.fifo.i_available = 0;
122 * Initialize the decoder properties
124 p_adec->bank_0.actual = p_adec->bank_0.v1;
125 p_adec->bank_0.pos = 0;
126 p_adec->bank_1.actual = p_adec->bank_1.v1;
127 p_adec->bank_1.pos = 0;
130 * Initialize the output properties
132 p_adec->p_aout = p_input->p_aout;
133 p_adec->p_aout_fifo = NULL;
135 /* Spawn the audio decoder thread */
136 if ( vlc_thread_create(&p_adec->thread_id, "audio decoder", (vlc_thread_func_t)RunThread, (void *)p_adec) )
138 intf_ErrMsg("adec error: can't spawn audio decoder thread\n");
143 intf_DbgMsg("adec debug: audio decoder thread (%p) created\n", p_adec);
147 /*****************************************************************************
148 * adec_DestroyThread: destroys an audio decoder thread
149 *****************************************************************************
150 * This function asks an audio decoder thread to terminate. This function has
151 * not to wait until the decoder thread has really died, because the killer (ie
152 * this function's caller) is the input thread, that's why we are sure that no
153 * other thread will try to access to this thread's descriptor after its
155 *****************************************************************************/
156 void adec_DestroyThread( adec_thread_t * p_adec )
158 intf_DbgMsg("adec debug: requesting termination of audio decoder thread %p\n", p_adec);
160 /* Ask thread to kill itself */
163 /* Make sure the decoder thread leaves the GetByte() function */
164 vlc_mutex_lock( &(p_adec->fifo.data_lock) );
165 vlc_cond_signal( &(p_adec->fifo.data_wait) );
166 vlc_mutex_unlock( &(p_adec->fifo.data_lock) );
168 /* Waiting for the decoder thread to exit */
169 /* Remove this as soon as the "status" flag is implemented */
170 vlc_thread_join( p_adec->thread_id );
173 /* Following functions are local */
175 /*****************************************************************************
176 * FindHeader : parses an input stream until an audio frame header could be
178 *****************************************************************************
179 * When this function returns successfully, the header can be found in the
180 * buffer of the bit stream fifo.
181 *****************************************************************************/
182 static int FindHeader( adec_thread_t * p_adec )
184 while ( (!p_adec->b_die) && (!p_adec->b_error) )
186 NeedBits( &p_adec->bit_stream, 32 );
187 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SYNCWORD_MASK) == ADEC_HEADER_SYNCWORD_MASK )
191 DumpBits( &p_adec->bit_stream, 8 );
197 /*****************************************************************************
198 * adec_Layer`L'_`M': decodes an mpeg 1, layer `L', mode `M', audio frame
199 *****************************************************************************
200 * These functions decode the audio frame which has already its header loaded
201 * in the i_header member of the audio decoder thread structure and its first
202 * byte of data described by the bit stream structure of the audio decoder
203 * thread (there is no bit available in the bit buffer yet)
204 *****************************************************************************/
206 /*****************************************************************************
208 *****************************************************************************/
209 static __inline__ int adec_Layer1_Mono( adec_thread_t * p_adec )
211 p_adec->bit_stream.fifo.buffer = 0;
212 p_adec->bit_stream.fifo.i_available = 0;
216 /*****************************************************************************
218 *****************************************************************************/
219 static __inline__ int adec_Layer1_Stereo( adec_thread_t * p_adec )
221 p_adec->bit_stream.fifo.buffer = 0;
222 p_adec->bit_stream.fifo.i_available = 0;
226 /*****************************************************************************
228 *****************************************************************************/
229 static __inline__ int adec_Layer2_Mono( adec_thread_t * p_adec )
231 p_adec->bit_stream.fifo.buffer = 0;
232 p_adec->bit_stream.fifo.i_available = 0;
236 /*****************************************************************************
238 *****************************************************************************/
239 static __inline__ int adec_Layer2_Stereo( adec_thread_t * p_adec )
241 typedef struct requantization_s
243 byte_t i_bits_per_codeword;
244 const float * pf_ungroup;
249 static const float pf_scalefactor[64] = ADEC_SCALE_FACTOR;
252 static int i_sampling_frequency, i_mode, i_bound;
253 static int pi_allocation_0[32], pi_allocation_1[32]; /* see ISO/IEC 11172-3 2.4.1.6 */
255 float f_scalefactor_0, f_scalefactor_1;
257 static const byte_t ppi_bitrate_per_channel_index[4][15] = ADEC_LAYER2_BITRATE_PER_CHANNEL_INDEX;
258 static const byte_t ppi_sblimit[3][11] = ADEC_LAYER2_SBLIMIT;
259 static const byte_t ppi_nbal[2][32] = ADEC_LAYER2_NBAL;
261 static const float pf_ungroup3[3*3*3 * 3] = ADEC_LAYER2_UNGROUP3;
262 static const float pf_ungroup5[5*5*5 * 3] = ADEC_LAYER2_UNGROUP5;
263 static const float pf_ungroup9[9*9*9 * 3] = ADEC_LAYER2_UNGROUP9;
265 static const requantization_t p_requantization_cd[16] = ADEC_LAYER2_REQUANTIZATION_CD;
266 static const requantization_t p_requantization_ab1[16] = ADEC_LAYER2_REQUANTIZATION_AB1;
267 static const requantization_t p_requantization_ab2[16] = ADEC_LAYER2_REQUANTIZATION_AB2;
268 static const requantization_t p_requantization_ab3[16] = ADEC_LAYER2_REQUANTIZATION_AB3;
269 static const requantization_t p_requantization_ab4[16] = ADEC_LAYER2_REQUANTIZATION_AB4;
270 static const requantization_t * pp_requantization_ab[30] = ADEC_LAYER2_REQUANTIZATION_AB;
272 static int i_sblimit, i_bitrate_per_channel_index;
273 static int pi_scfsi_0[30], pi_scfsi_1[30];
274 static const byte_t * pi_nbal;
275 static float ppf_sample_0[3][32], ppf_sample_1[3][32];
276 static const requantization_t * pp_requantization_0[30];
277 static const requantization_t * pp_requantization_1[30];
278 static requantization_t requantization;
279 static const float * pf_ungroup;
281 static float pf_scalefactor_0_0[30], pf_scalefactor_0_1[30], pf_scalefactor_0_2[30];
282 static float pf_scalefactor_1_0[30], pf_scalefactor_1_1[30], pf_scalefactor_1_2[30];
290 int i_need = 0, i_dump = 0;
292 static const int pi_framesize[512] = ADEC_FRAME_SIZE;
295 /* Read the audio frame header and flush the bit buffer */
296 i_header = p_adec->bit_stream.fifo.buffer;
297 p_adec->bit_stream.fifo.buffer = 0;
298 p_adec->bit_stream.fifo.i_available = 0;
299 /* Read the sampling frequency (see ISO/IEC 11172-3 2.4.2.3) */
300 i_sampling_frequency = (int)((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK)
301 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT);
302 /* Read the mode (see ISO/IEC 11172-3 2.4.2.3) */
303 i_mode = (int)((i_header & ADEC_HEADER_MODE_MASK) >> ADEC_HEADER_MODE_SHIFT);
304 /* If a CRC can be found in the frame, get rid of it */
305 if ( (i_header & ADEC_HEADER_PROTECTION_BIT_MASK) == 0 )
307 GetByte( &p_adec->bit_stream );
308 GetByte( &p_adec->bit_stream );
311 /* Find out the bitrate per channel index */
312 i_bitrate_per_channel_index = (int)ppi_bitrate_per_channel_index[i_mode]
313 [(i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT];
314 /* Find out the number of subbands */
315 i_sblimit = (int)ppi_sblimit[i_sampling_frequency][i_bitrate_per_channel_index];
316 /* Check if the frame is valid or not */
317 if ( i_sblimit == 0 )
319 return( 0 ); /* the frame is invalid */
321 /* Find out the number of bits allocated */
322 pi_nbal = ppi_nbal[ (i_bitrate_per_channel_index <= 2) ? 0 : 1 ];
324 /* Find out the `bound' subband (see ISO/IEC 11172-3 2.4.2.3) */
327 i_bound = (int)(((i_header & ADEC_HEADER_MODE_EXTENSION_MASK) >> (ADEC_HEADER_MODE_EXTENSION_SHIFT - 2)) + 4);
328 if ( i_bound > i_sblimit )
338 /* Read the allocation information (see ISO/IEC 11172-3 2.4.1.6) */
339 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
341 i_2nbal = 2 * (i_nbal = (int)pi_nbal[ i_sb ]);
342 NeedBits( &p_adec->bit_stream, i_2nbal );
344 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
345 p_adec->bit_stream.fifo.buffer <<= i_nbal;
346 pi_allocation_1[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
347 p_adec->bit_stream.fifo.buffer <<= i_nbal;
348 p_adec->bit_stream.fifo.i_available -= i_2nbal;
351 for ( ; i_sb < i_sblimit; i_sb++ )
353 i_nbal = (int)pi_nbal[ i_sb ];
354 NeedBits( &p_adec->bit_stream, i_nbal );
356 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
357 DumpBits( &p_adec->bit_stream, i_nbal );
361 #define MACRO( p_requantization ) \
362 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
364 if ( pi_allocation_0[i_sb] ) \
366 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
367 NeedBits( &p_adec->bit_stream, 2 ); \
369 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
370 DumpBits( &p_adec->bit_stream, 2 ); \
375 ppf_sample_0[0][i_sb] = .0; \
376 ppf_sample_0[1][i_sb] = .0; \
377 ppf_sample_0[2][i_sb] = .0; \
380 if ( pi_allocation_1[i_sb] ) \
382 pp_requantization_1[i_sb] = &((p_requantization)[pi_allocation_1[i_sb]]); \
383 NeedBits( &p_adec->bit_stream, 2 ); \
385 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
386 DumpBits( &p_adec->bit_stream, 2 ); \
391 ppf_sample_1[0][i_sb] = .0; \
392 ppf_sample_1[1][i_sb] = .0; \
393 ppf_sample_1[2][i_sb] = .0; \
397 for ( ; i_sb < i_sblimit; i_sb++ ) \
399 if ( pi_allocation_0[i_sb] ) \
401 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
402 NeedBits( &p_adec->bit_stream, 4 ); \
404 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
405 p_adec->bit_stream.fifo.buffer <<= 2; \
406 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
407 p_adec->bit_stream.fifo.buffer <<= 2; \
408 p_adec->bit_stream.fifo.i_available -= 4; \
413 ppf_sample_0[0][i_sb] = .0; \
414 ppf_sample_0[1][i_sb] = .0; \
415 ppf_sample_0[2][i_sb] = .0; \
416 ppf_sample_1[0][i_sb] = .0; \
417 ppf_sample_1[1][i_sb] = .0; \
418 ppf_sample_1[2][i_sb] = .0; \
423 if ( i_bitrate_per_channel_index <= 2 )
425 MACRO( p_requantization_cd )
429 MACRO( pp_requantization_ab[i_sb] )
432 #define SWITCH( pi_scfsi, pf_scalefactor_0, pf_scalefactor_1, pf_scalefactor_2 )\
433 switch ( (pi_scfsi)[i_sb] ) \
436 NeedBits( &p_adec->bit_stream, (3*6) ); \
438 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
439 p_adec->bit_stream.fifo.buffer <<= 6; \
440 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
441 p_adec->bit_stream.fifo.buffer <<= 6; \
442 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
443 p_adec->bit_stream.fifo.buffer <<= 6; \
444 p_adec->bit_stream.fifo.i_available -= (3*6); \
449 NeedBits( &p_adec->bit_stream, (2*6) ); \
451 (pf_scalefactor_0)[i_sb] = \
452 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
453 p_adec->bit_stream.fifo.buffer <<= 6; \
454 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
455 p_adec->bit_stream.fifo.buffer <<= 6; \
456 p_adec->bit_stream.fifo.i_available -= (2*6); \
461 NeedBits( &p_adec->bit_stream, (1*6) ); \
463 (pf_scalefactor_0)[i_sb] = \
464 (pf_scalefactor_1)[i_sb] = \
465 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
466 DumpBits( &p_adec->bit_stream, (1*6) ); \
471 NeedBits( &p_adec->bit_stream, (2*6) ); \
473 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
474 p_adec->bit_stream.fifo.buffer <<= 6; \
475 (pf_scalefactor_1)[i_sb] = \
476 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
477 p_adec->bit_stream.fifo.buffer <<= 6; \
478 p_adec->bit_stream.fifo.i_available -= (2*6); \
484 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
486 if ( pi_allocation_0[i_sb] )
488 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
490 if ( pi_allocation_1[i_sb] )
492 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
495 for ( ; i_sb < i_sblimit; i_sb++ )
497 if ( pi_allocation_0[i_sb] )
499 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
500 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
503 for ( ; i_sb < 32; i_sb++ )
505 ppf_sample_0[0][i_sb] = .0;
506 ppf_sample_0[1][i_sb] = .0;
507 ppf_sample_0[2][i_sb] = .0;
508 ppf_sample_1[0][i_sb] = .0;
509 ppf_sample_1[1][i_sb] = .0;
510 ppf_sample_1[2][i_sb] = .0;
514 /* fprintf(stderr, "%p\n", p_adec->p_aout_fifo->buffer); */ \
515 /* fprintf(stderr, "l_end_frame == %li, %p\n", l_end_frame, (aout_frame_t *)p_adec->p_aout_fifo->buffer + l_end_frame); */ \
516 p_s16 = ((adec_frame_t *)p_adec->p_aout_fifo->buffer)[ l_end_frame ]; \
517 /* fprintf(stderr, "p_s16 == %p\n", p_s16); */ \
519 l_end_frame &= AOUT_FIFO_SIZE;
520 /* #define NEXT_BUF */
522 #define GROUPTEST( pp_requantization, ppf_sample, pf_sf ) \
523 requantization = *((pp_requantization)[i_sb]); \
524 if ( requantization.pf_ungroup == NULL ) \
526 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
527 i_need += requantization.i_bits_per_codeword; \
528 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * (requantization.f_slope * \
529 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
530 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
531 i_dump += requantization.i_bits_per_codeword; \
533 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
534 i_need += requantization.i_bits_per_codeword; \
535 (ppf_sample)[1][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
536 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
537 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
538 i_dump += requantization.i_bits_per_codeword; \
540 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
541 i_need += requantization.i_bits_per_codeword; \
542 (ppf_sample)[2][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
543 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
544 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
545 i_dump += requantization.i_bits_per_codeword; \
549 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
550 i_need += requantization.i_bits_per_codeword; \
551 pf_ungroup = requantization.pf_ungroup + 3 * \
552 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
553 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
554 i_dump += requantization.i_bits_per_codeword; \
555 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * pf_ungroup[0]; \
556 (ppf_sample)[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
557 (ppf_sample)[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
559 /* #define GROUPTEST */
561 #define READ_SAMPLE_L2S( pf_scalefactor_0, pf_scalefactor_1, i_grlimit ) \
562 for ( ; i_gr < (i_grlimit); i_gr++ ) \
564 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
566 if ( pi_allocation_0[i_sb] ) \
568 GROUPTEST( pp_requantization_0, ppf_sample_0, (pf_scalefactor_0) ) \
570 if ( pi_allocation_1[i_sb] ) \
572 GROUPTEST( pp_requantization_1, ppf_sample_1, (pf_scalefactor_1) ) \
575 for ( ; i_sb < i_sblimit; i_sb++ ) \
577 if ( pi_allocation_0[i_sb] ) \
579 requantization = *(pp_requantization_0[i_sb]); \
580 if ( requantization.pf_ungroup == NULL ) \
582 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
583 i_need += requantization.i_bits_per_codeword; \
584 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * \
585 (requantization.f_slope * (f_dummy = \
586 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
587 requantization.f_offset); \
588 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
589 i_dump += requantization.i_bits_per_codeword; \
590 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * \
591 (requantization.f_slope * f_dummy + requantization.f_offset); \
593 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
594 i_need += requantization.i_bits_per_codeword; \
595 ppf_sample_0[1][i_sb] = f_scalefactor_0 * \
596 (requantization.f_slope * (f_dummy = \
597 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
598 requantization.f_offset); \
599 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
600 i_dump += requantization.i_bits_per_codeword; \
601 ppf_sample_1[1][i_sb] = f_scalefactor_1 * \
602 (requantization.f_slope * f_dummy + requantization.f_offset); \
604 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
605 i_need += requantization.i_bits_per_codeword; \
606 ppf_sample_0[2][i_sb] = f_scalefactor_0 * \
607 (requantization.f_slope * (f_dummy = \
608 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
609 requantization.f_offset); \
610 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
611 i_dump += requantization.i_bits_per_codeword; \
612 ppf_sample_1[2][i_sb] = f_scalefactor_1 * \
613 (requantization.f_slope * f_dummy + requantization.f_offset); \
617 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
618 i_need += requantization.i_bits_per_codeword; \
619 pf_ungroup = requantization.pf_ungroup + 3 * \
620 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
621 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
622 i_dump += requantization.i_bits_per_codeword; \
624 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * pf_ungroup[0]; \
625 ppf_sample_0[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
626 ppf_sample_0[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
628 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * pf_ungroup[0]; \
629 ppf_sample_1[1][i_sb] = f_scalefactor_1 * pf_ungroup[1]; \
630 ppf_sample_1[2][i_sb] = f_scalefactor_1 * pf_ungroup[2]; \
635 /* fprintf(stderr, "%p", p_s16); */ \
636 DCT32( ppf_sample_0[0], &p_adec->bank_0 ); \
637 PCM( &p_adec->bank_0, &p_s16, 2 ); \
638 /* fprintf(stderr, " %p", p_s16); */ \
640 /* fprintf(stderr, " %p\n", p_s16); */ \
642 /* fprintf(stderr, "%p", p_s16); */ \
643 DCT32( ppf_sample_1[0], &p_adec->bank_1 ); \
644 PCM( &p_adec->bank_1, &p_s16, 2 ); \
645 /* fprintf(stderr, " %p", p_s16); */ \
647 /* fprintf(stderr, " %p\n", p_s16); */ \
649 /* fprintf(stderr, "%p", p_s16); */ \
650 DCT32( ppf_sample_0[1], &p_adec->bank_0 ); \
651 PCM( &p_adec->bank_0, &p_s16, 2 ); \
652 /* fprintf(stderr, " %p", p_s16); */ \
654 /* fprintf(stderr, " %p\n", p_s16); */ \
656 /* fprintf(stderr, "%p", p_s16); */ \
657 DCT32( ppf_sample_1[1], &p_adec->bank_1 ); \
658 PCM( &p_adec->bank_1, &p_s16, 2 ); \
659 /* fprintf(stderr, " %p", p_s16); */ \
661 /* fprintf(stderr, " %p\n", p_s16); */ \
663 /* fprintf(stderr, "%p", p_s16); */ \
664 DCT32( ppf_sample_0[2], &p_adec->bank_0 ); \
665 PCM( &p_adec->bank_0, &p_s16, 2 ); \
666 /* fprintf(stderr, " %p", p_s16); */ \
668 /* fprintf(stderr, " %p\n", p_s16); */ \
670 /* fprintf(stderr, "%p", p_s16); */ \
671 DCT32( ppf_sample_1[2], &p_adec->bank_1 ); \
672 PCM( &p_adec->bank_1, &p_s16, 2 ); \
673 /* fprintf(stderr, " %p", p_s16); */ \
675 /* fprintf(stderr, " %p\n", p_s16); */ \
677 /* #define READ_SAMPLE_L2S */
679 l_end_frame = p_adec->p_aout_fifo->l_end_frame;
683 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 2 )
686 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 4 )
689 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 6 )
692 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 8 )
695 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 10 )
698 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 12 )
701 fprintf(stderr, "adec debug: layer == %i, padding_bit == %i, sampling_frequency == %i, bitrate_index == %i\n",
702 (i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT,
703 (i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT,
704 (i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT,
705 (i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT);
706 fprintf(stderr, "adec debug: framesize == %i, i_need == %i, i_dump == %i\n",
707 pi_framesize[ 128 * ((i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT) +
708 64 * ((i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT) +
709 16 * ((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT) +
710 1 * ((i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT) ],
714 p_adec->bit_stream.fifo.buffer = 0;
715 p_adec->bit_stream.fifo.i_available = 0;
719 /*****************************************************************************
720 * InitThread : initialize an audio decoder thread
721 *****************************************************************************
722 * This function is called from RunThread and performs the second step of the
723 * initialization. It returns 0 on success.
724 *****************************************************************************/
725 static int InitThread( adec_thread_t * p_adec )
727 aout_fifo_t aout_fifo;
729 intf_DbgMsg("adec debug: initializing audio decoder thread %p\n", p_adec);
731 /* Our first job is to initialize the bit stream structure with the
732 * beginning of the input stream */
733 vlc_mutex_lock( &p_adec->fifo.data_lock );
734 while ( DECODER_FIFO_ISEMPTY(p_adec->fifo) )
738 vlc_mutex_unlock( &p_adec->fifo.data_lock );
741 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
743 p_adec->bit_stream.p_ts = DECODER_FIFO_START( p_adec->fifo )->p_first_ts;
744 p_adec->bit_stream.p_byte = p_adec->bit_stream.p_ts->buffer + p_adec->bit_stream.p_ts->i_payload_start;
745 p_adec->bit_stream.p_end = p_adec->bit_stream.p_ts->buffer + p_adec->bit_stream.p_ts->i_payload_end;
746 vlc_mutex_unlock( &p_adec->fifo.data_lock );
748 /* Now we look for an audio frame header in the input stream */
749 if ( FindHeader(p_adec) )
751 return( -1 ); /* b_die or b_error is set */
755 * We have the header and all its informations : we must be able to create
756 * the audio output fifo.
759 /* Is the sound in mono mode or stereo mode ? */
760 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
762 intf_DbgMsg("adec debug: mode == mono\n");
763 aout_fifo.i_type = AOUT_ADEC_MONO_FIFO;
764 aout_fifo.i_channels = 1;
765 aout_fifo.b_stereo = 0;
769 intf_DbgMsg("adec debug: mode == stereo\n");
770 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
771 aout_fifo.i_channels = 2;
772 aout_fifo.b_stereo = 1;
775 /* Checking the sampling frequency */
776 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) \
777 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT )
780 intf_DbgMsg("adec debug: sampling_frequency == 44100 Hz\n");
781 aout_fifo.l_rate = 44100;
785 intf_DbgMsg("adec debug: sampling_frequency == 48000 Hz\n");
786 aout_fifo.l_rate = 48000;
790 intf_DbgMsg("adec debug: sampling_frequency == 32000 Hz\n");
791 aout_fifo.l_rate = 32000;
795 intf_ErrMsg("adec error: can't create audio output fifo (sampling_frequency == `reserved')\n");
799 aout_fifo.l_frame_size = ADEC_FRAME_SIZE;
801 /* Creating the audio output fifo */
802 if ( (p_adec->p_aout_fifo = aout_CreateFifo(p_adec->p_aout, &aout_fifo)) == NULL )
807 intf_DbgMsg("adec debug: audio decoder thread %p initialized\n", p_adec);
811 /*****************************************************************************
812 * RunThread : audio decoder thread
813 *****************************************************************************
814 * Audio decoder thread. This function does only returns when the thread is
816 *****************************************************************************/
817 static void RunThread( adec_thread_t * p_adec )
820 static const int pi_framesize[512] = ADEC_FRAME_SIZE;
826 intf_DbgMsg("adec debug: running audio decoder thread (%p) (pid == %i)\n", p_adec, getpid());
828 msleep( INPUT_PTS_DELAY );
830 /* Initializing the audio decoder thread */
831 if ( InitThread(p_adec) )
836 /* Audio decoder thread's main loop */
837 while ( (!p_adec->b_die) && (!p_adec->b_error) )
839 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT )
843 intf_DbgMsg("adec debug: layer == 0 (reserved)\n");
844 p_adec->bit_stream.fifo.buffer = 0;
845 p_adec->bit_stream.fifo.i_available = 0;
850 p_adec->bit_stream.fifo.buffer = 0;
851 p_adec->bit_stream.fifo.i_available = 0;
856 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
858 adec_Layer2_Mono( p_adec );
862 /* Waiting until there is enough free space in the audio output fifo
863 * in order to store the new decoded frames */
864 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
865 /* adec_Layer2_Stereo() produces 6 output frames (2*1152/384)...
866 * If these 6 frames were recorded in the audio output fifo, the
867 * l_end_frame index would be incremented 6 times. But, if after
868 * this operation the audio output fifo contains less than 6 frames,
869 * it would mean that we had not enough room to store the 6 frames :-P */
870 while ( (((p_adec->p_aout_fifo->l_end_frame + 6) - p_adec->p_aout_fifo->l_start_frame) & AOUT_FIFO_SIZE) < 6 ) /* XXX?? */
872 vlc_cond_wait( &p_adec->p_aout_fifo->data_wait, &p_adec->p_aout_fifo->data_lock );
874 if ( DECODER_FIFO_START(p_adec->fifo)->b_has_pts )
876 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(p_adec->fifo)->i_pts;
877 DECODER_FIFO_START(p_adec->fifo)->b_has_pts = 0;
881 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
883 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
885 /* Decoding the frames */
886 if ( adec_Layer2_Stereo(p_adec) )
888 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
891 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
894 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
895 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
898 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
899 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
902 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
903 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
906 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
907 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
910 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
911 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
913 vlc_cond_signal( &p_adec->p_aout_fifo->data_wait );
915 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
922 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
924 adec_Layer1_Mono( p_adec );
928 adec_Layer1_Stereo( p_adec );
933 intf_DbgMsg("adec debug: layer == %i (unknown)\n",
934 (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT);
935 p_adec->bit_stream.fifo.buffer = 0;
936 p_adec->bit_stream.fifo.i_available = 0;
939 FindHeader( p_adec );
942 /* If b_error is set, the audio decoder thread enters the error loop */
943 if ( p_adec->b_error )
945 ErrorThread( p_adec );
948 /* End of the audio decoder thread */
952 /*****************************************************************************
953 * ErrorThread : audio decoder's RunThread() error loop
954 *****************************************************************************
955 * This function is called when an error occured during thread main's loop. The
956 * thread can still receive feed, but must be ready to terminate as soon as
958 *****************************************************************************/
959 static void ErrorThread( adec_thread_t *p_adec )
961 /* We take the lock, because we are going to read/write the start/end
962 * indexes of the decoder fifo */
963 vlc_mutex_lock( &p_adec->fifo.data_lock );
965 /* Wait until a `die' order is sent */
966 while( !p_adec->b_die )
968 /* Trash all received PES packets */
969 while( !DECODER_FIFO_ISEMPTY(p_adec->fifo) )
971 input_NetlistFreePES( p_adec->bit_stream.p_input, DECODER_FIFO_START(p_adec->fifo) );
972 DECODER_FIFO_INCSTART( p_adec->fifo );
975 /* Waiting for the input thread to put new PES packets in the fifo */
976 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
979 /* We can release the lock before leaving */
980 vlc_mutex_unlock( &p_adec->fifo.data_lock );
983 /*****************************************************************************
984 * EndThread : audio decoder thread destruction
985 *****************************************************************************
986 * This function is called when the thread ends after a sucessfull
988 *****************************************************************************/
989 static void EndThread( adec_thread_t *p_adec )
991 intf_DbgMsg("adec debug: destroying audio decoder thread %p\n", p_adec);
993 /* If the audio output fifo was created, we destroy it */
994 if ( p_adec->p_aout_fifo != NULL )
996 aout_DestroyFifo( p_adec->p_aout_fifo );
998 /* Make sure the output thread leaves the NextFrame() function */
999 vlc_mutex_lock( &(p_adec->p_aout_fifo->data_lock) );
1000 vlc_cond_signal( &(p_adec->p_aout_fifo->data_wait) );
1001 vlc_mutex_unlock( &(p_adec->p_aout_fifo->data_lock) );
1003 /* Destroy descriptor */
1006 intf_DbgMsg("adec debug: audio decoder thread %p destroyed\n", p_adec);