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" */
46 #include "debug.h" /* "input_netlist.h" */
48 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
50 #include "input.h" /* pes_packet_t */
51 #include "input_netlist.h" /* input_NetlistFreePES() */
52 #include "decoder_fifo.h" /* DECODER_FIFO_(ISEMPTY|START|INCSTART)() */
54 #include "audio_output.h" /* aout_fifo_t (for audio_decoder.h) */
56 #include "audio_constants.h"
57 #include "audio_decoder.h"
58 #include "audio_math.h" /* DCT32(), PCM() */
60 /*****************************************************************************
62 *****************************************************************************/
63 static int InitThread ( adec_thread_t * p_adec );
64 static void RunThread ( adec_thread_t * p_adec );
65 static void ErrorThread ( adec_thread_t * p_adec );
66 static void EndThread ( adec_thread_t * p_adec );
69 static int adec_Layer1_Mono ( adec_thread_t * p_adec );
70 static int adec_Layer1_Stereo ( adec_thread_t * p_adec );
71 static int adec_Layer2_Mono ( adec_thread_t * p_adec );
72 static int adec_Layer2_Stereo ( adec_thread_t * p_adec );
74 static byte_t GetByte ( bit_stream_t * p_bit_stream );
75 static void NeedBits ( bit_stream_t * p_bit_stream, int i_bits );
76 static void DumpBits ( bit_stream_t * p_bit_stream, int i_bits );
77 static int FindHeader ( adec_thread_t * p_adec );
80 /*****************************************************************************
81 * adec_CreateThread: creates an audio decoder thread
82 *****************************************************************************
83 * This function creates a new audio decoder thread, and returns a pointer to
84 * its description. On error, it returns NULL.
85 *****************************************************************************/
86 adec_thread_t * adec_CreateThread( input_thread_t * p_input )
88 adec_thread_t * p_adec;
90 intf_DbgMsg("adec debug: creating audio decoder thread\n");
92 /* Allocate the memory needed to store the thread's structure */
93 if ( (p_adec = (adec_thread_t *)malloc( sizeof(adec_thread_t) )) == NULL )
95 intf_ErrMsg("adec error: not enough memory for adec_CreateThread() to create the new thread\n");
100 * Initialize the thread properties
106 * Initialize the input properties
108 /* Initialize the decoder fifo's data lock and conditional variable and set
109 * its buffer as empty */
110 vlc_mutex_init( &p_adec->fifo.data_lock );
111 vlc_cond_init( &p_adec->fifo.data_wait );
112 p_adec->fifo.i_start = 0;
113 p_adec->fifo.i_end = 0;
114 /* Initialize the bit stream structure */
115 p_adec->bit_stream.p_input = p_input;
116 p_adec->bit_stream.p_decoder_fifo = &p_adec->fifo;
117 p_adec->bit_stream.fifo.buffer = 0;
118 p_adec->bit_stream.fifo.i_available = 0;
121 * Initialize the decoder properties
123 p_adec->bank_0.actual = p_adec->bank_0.v1;
124 p_adec->bank_0.pos = 0;
125 p_adec->bank_1.actual = p_adec->bank_1.v1;
126 p_adec->bank_1.pos = 0;
129 * Initialize the output properties
131 p_adec->p_aout = p_input->p_aout;
132 p_adec->p_aout_fifo = NULL;
134 /* Spawn the audio decoder thread */
135 if ( vlc_thread_create(&p_adec->thread_id, "audio decoder", (vlc_thread_func_t)RunThread, (void *)p_adec) )
137 intf_ErrMsg("adec error: can't spawn audio decoder thread\n");
142 intf_DbgMsg("adec debug: audio decoder thread (%p) created\n", p_adec);
146 /*****************************************************************************
147 * adec_DestroyThread: destroys an audio decoder thread
148 *****************************************************************************
149 * This function asks an audio decoder thread to terminate. This function has
150 * not to wait until the decoder thread has really died, because the killer (ie
151 * this function's caller) is the input thread, that's why we are sure that no
152 * other thread will try to access to this thread's descriptor after its
154 *****************************************************************************/
155 void adec_DestroyThread( adec_thread_t * p_adec )
157 intf_DbgMsg("adec debug: requesting termination of audio decoder thread %p\n", p_adec);
159 /* Ask thread to kill itself */
162 /* Make sure the decoder thread leaves the GetByte() function */
163 vlc_mutex_lock( &(p_adec->fifo.data_lock) );
164 vlc_cond_signal( &(p_adec->fifo.data_wait) );
165 vlc_mutex_unlock( &(p_adec->fifo.data_lock) );
167 /* Waiting for the decoder thread to exit */
168 /* Remove this as soon as the "status" flag is implemented */
169 vlc_thread_join( p_adec->thread_id );
172 /* Following functions are local */
174 /*****************************************************************************
175 * FindHeader : parses an input stream until an audio frame header could be
177 *****************************************************************************
178 * When this function returns successfully, the header can be found in the
179 * buffer of the bit stream fifo.
180 *****************************************************************************/
181 static int FindHeader( adec_thread_t * p_adec )
183 while ( (!p_adec->b_die) && (!p_adec->b_error) )
185 NeedBits( &p_adec->bit_stream, 32 );
186 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SYNCWORD_MASK) == ADEC_HEADER_SYNCWORD_MASK )
190 DumpBits( &p_adec->bit_stream, 8 );
196 /*****************************************************************************
197 * adec_Layer`L'_`M': decodes an mpeg 1, layer `L', mode `M', audio frame
198 *****************************************************************************
199 * These functions decode the audio frame which has already its header loaded
200 * in the i_header member of the audio decoder thread structure and its first
201 * byte of data described by the bit stream structure of the audio decoder
202 * thread (there is no bit available in the bit buffer yet)
203 *****************************************************************************/
205 /*****************************************************************************
207 *****************************************************************************/
208 static __inline__ int adec_Layer1_Mono( adec_thread_t * p_adec )
210 p_adec->bit_stream.fifo.buffer = 0;
211 p_adec->bit_stream.fifo.i_available = 0;
215 /*****************************************************************************
217 *****************************************************************************/
218 static __inline__ int adec_Layer1_Stereo( adec_thread_t * p_adec )
220 p_adec->bit_stream.fifo.buffer = 0;
221 p_adec->bit_stream.fifo.i_available = 0;
225 /*****************************************************************************
227 *****************************************************************************/
228 static __inline__ int adec_Layer2_Mono( adec_thread_t * p_adec )
230 p_adec->bit_stream.fifo.buffer = 0;
231 p_adec->bit_stream.fifo.i_available = 0;
235 /*****************************************************************************
237 *****************************************************************************/
238 static __inline__ int adec_Layer2_Stereo( adec_thread_t * p_adec )
240 typedef struct requantization_s
242 byte_t i_bits_per_codeword;
243 const float * pf_ungroup;
248 static const float pf_scalefactor[64] = ADEC_SCALE_FACTOR;
251 static int i_sampling_frequency, i_mode, i_bound;
252 static int pi_allocation_0[32], pi_allocation_1[32]; /* see ISO/IEC 11172-3 2.4.1.6 */
254 float f_scalefactor_0, f_scalefactor_1;
256 static const byte_t ppi_bitrate_per_channel_index[4][15] = ADEC_LAYER2_BITRATE_PER_CHANNEL_INDEX;
257 static const byte_t ppi_sblimit[3][11] = ADEC_LAYER2_SBLIMIT;
258 static const byte_t ppi_nbal[2][32] = ADEC_LAYER2_NBAL;
260 static const float pf_ungroup3[3*3*3 * 3] = ADEC_LAYER2_UNGROUP3;
261 static const float pf_ungroup5[5*5*5 * 3] = ADEC_LAYER2_UNGROUP5;
262 static const float pf_ungroup9[9*9*9 * 3] = ADEC_LAYER2_UNGROUP9;
264 static const requantization_t p_requantization_cd[16] = ADEC_LAYER2_REQUANTIZATION_CD;
265 static const requantization_t p_requantization_ab1[16] = ADEC_LAYER2_REQUANTIZATION_AB1;
266 static const requantization_t p_requantization_ab2[16] = ADEC_LAYER2_REQUANTIZATION_AB2;
267 static const requantization_t p_requantization_ab3[16] = ADEC_LAYER2_REQUANTIZATION_AB3;
268 static const requantization_t p_requantization_ab4[16] = ADEC_LAYER2_REQUANTIZATION_AB4;
269 static const requantization_t * pp_requantization_ab[30] = ADEC_LAYER2_REQUANTIZATION_AB;
271 static int i_sblimit, i_bitrate_per_channel_index;
272 static int pi_scfsi_0[30], pi_scfsi_1[30];
273 static const byte_t * pi_nbal;
274 static float ppf_sample_0[3][32], ppf_sample_1[3][32];
275 static const requantization_t * pp_requantization_0[30];
276 static const requantization_t * pp_requantization_1[30];
277 static requantization_t requantization;
278 static const float * pf_ungroup;
280 static float pf_scalefactor_0_0[30], pf_scalefactor_0_1[30], pf_scalefactor_0_2[30];
281 static float pf_scalefactor_1_0[30], pf_scalefactor_1_1[30], pf_scalefactor_1_2[30];
289 int i_need = 0, i_dump = 0;
291 static const int pi_framesize[512] = ADEC_FRAME_SIZE;
294 /* Read the audio frame header and flush the bit buffer */
295 i_header = p_adec->bit_stream.fifo.buffer;
296 p_adec->bit_stream.fifo.buffer = 0;
297 p_adec->bit_stream.fifo.i_available = 0;
298 /* Read the sampling frequency (see ISO/IEC 11172-3 2.4.2.3) */
299 i_sampling_frequency = (int)((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK)
300 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT);
301 /* Read the mode (see ISO/IEC 11172-3 2.4.2.3) */
302 i_mode = (int)((i_header & ADEC_HEADER_MODE_MASK) >> ADEC_HEADER_MODE_SHIFT);
303 /* If a CRC can be found in the frame, get rid of it */
304 if ( (i_header & ADEC_HEADER_PROTECTION_BIT_MASK) == 0 )
306 GetByte( &p_adec->bit_stream );
307 GetByte( &p_adec->bit_stream );
310 /* Find out the bitrate per channel index */
311 i_bitrate_per_channel_index = (int)ppi_bitrate_per_channel_index[i_mode]
312 [(i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT];
313 /* Find out the number of subbands */
314 i_sblimit = (int)ppi_sblimit[i_sampling_frequency][i_bitrate_per_channel_index];
315 /* Check if the frame is valid or not */
316 if ( i_sblimit == 0 )
318 return( 0 ); /* the frame is invalid */
320 /* Find out the number of bits allocated */
321 pi_nbal = ppi_nbal[ (i_bitrate_per_channel_index <= 2) ? 0 : 1 ];
323 /* Find out the `bound' subband (see ISO/IEC 11172-3 2.4.2.3) */
326 i_bound = (int)(((i_header & ADEC_HEADER_MODE_EXTENSION_MASK) >> (ADEC_HEADER_MODE_EXTENSION_SHIFT - 2)) + 4);
327 if ( i_bound > i_sblimit )
337 /* Read the allocation information (see ISO/IEC 11172-3 2.4.1.6) */
338 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
340 i_2nbal = 2 * (i_nbal = (int)pi_nbal[ i_sb ]);
341 NeedBits( &p_adec->bit_stream, i_2nbal );
343 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
344 p_adec->bit_stream.fifo.buffer <<= i_nbal;
345 pi_allocation_1[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
346 p_adec->bit_stream.fifo.buffer <<= i_nbal;
347 p_adec->bit_stream.fifo.i_available -= i_2nbal;
350 for ( ; i_sb < i_sblimit; i_sb++ )
352 i_nbal = (int)pi_nbal[ i_sb ];
353 NeedBits( &p_adec->bit_stream, i_nbal );
355 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
356 DumpBits( &p_adec->bit_stream, i_nbal );
360 #define MACRO( p_requantization ) \
361 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
363 if ( pi_allocation_0[i_sb] ) \
365 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
366 NeedBits( &p_adec->bit_stream, 2 ); \
368 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
369 DumpBits( &p_adec->bit_stream, 2 ); \
374 ppf_sample_0[0][i_sb] = .0; \
375 ppf_sample_0[1][i_sb] = .0; \
376 ppf_sample_0[2][i_sb] = .0; \
379 if ( pi_allocation_1[i_sb] ) \
381 pp_requantization_1[i_sb] = &((p_requantization)[pi_allocation_1[i_sb]]); \
382 NeedBits( &p_adec->bit_stream, 2 ); \
384 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
385 DumpBits( &p_adec->bit_stream, 2 ); \
390 ppf_sample_1[0][i_sb] = .0; \
391 ppf_sample_1[1][i_sb] = .0; \
392 ppf_sample_1[2][i_sb] = .0; \
396 for ( ; i_sb < i_sblimit; i_sb++ ) \
398 if ( pi_allocation_0[i_sb] ) \
400 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
401 NeedBits( &p_adec->bit_stream, 4 ); \
403 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
404 p_adec->bit_stream.fifo.buffer <<= 2; \
405 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
406 p_adec->bit_stream.fifo.buffer <<= 2; \
407 p_adec->bit_stream.fifo.i_available -= 4; \
412 ppf_sample_0[0][i_sb] = .0; \
413 ppf_sample_0[1][i_sb] = .0; \
414 ppf_sample_0[2][i_sb] = .0; \
415 ppf_sample_1[0][i_sb] = .0; \
416 ppf_sample_1[1][i_sb] = .0; \
417 ppf_sample_1[2][i_sb] = .0; \
422 if ( i_bitrate_per_channel_index <= 2 )
424 MACRO( p_requantization_cd )
428 MACRO( pp_requantization_ab[i_sb] )
431 #define SWITCH( pi_scfsi, pf_scalefactor_0, pf_scalefactor_1, pf_scalefactor_2 )\
432 switch ( (pi_scfsi)[i_sb] ) \
435 NeedBits( &p_adec->bit_stream, (3*6) ); \
437 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
438 p_adec->bit_stream.fifo.buffer <<= 6; \
439 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
440 p_adec->bit_stream.fifo.buffer <<= 6; \
441 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
442 p_adec->bit_stream.fifo.buffer <<= 6; \
443 p_adec->bit_stream.fifo.i_available -= (3*6); \
448 NeedBits( &p_adec->bit_stream, (2*6) ); \
450 (pf_scalefactor_0)[i_sb] = \
451 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
452 p_adec->bit_stream.fifo.buffer <<= 6; \
453 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
454 p_adec->bit_stream.fifo.buffer <<= 6; \
455 p_adec->bit_stream.fifo.i_available -= (2*6); \
460 NeedBits( &p_adec->bit_stream, (1*6) ); \
462 (pf_scalefactor_0)[i_sb] = \
463 (pf_scalefactor_1)[i_sb] = \
464 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
465 DumpBits( &p_adec->bit_stream, (1*6) ); \
470 NeedBits( &p_adec->bit_stream, (2*6) ); \
472 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
473 p_adec->bit_stream.fifo.buffer <<= 6; \
474 (pf_scalefactor_1)[i_sb] = \
475 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
476 p_adec->bit_stream.fifo.buffer <<= 6; \
477 p_adec->bit_stream.fifo.i_available -= (2*6); \
483 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
485 if ( pi_allocation_0[i_sb] )
487 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
489 if ( pi_allocation_1[i_sb] )
491 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
494 for ( ; i_sb < i_sblimit; i_sb++ )
496 if ( pi_allocation_0[i_sb] )
498 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
499 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
502 for ( ; i_sb < 32; i_sb++ )
504 ppf_sample_0[0][i_sb] = .0;
505 ppf_sample_0[1][i_sb] = .0;
506 ppf_sample_0[2][i_sb] = .0;
507 ppf_sample_1[0][i_sb] = .0;
508 ppf_sample_1[1][i_sb] = .0;
509 ppf_sample_1[2][i_sb] = .0;
513 /* fprintf(stderr, "%p\n", p_adec->p_aout_fifo->buffer); */ \
514 /* fprintf(stderr, "l_end_frame == %li, %p\n", l_end_frame, (aout_frame_t *)p_adec->p_aout_fifo->buffer + l_end_frame); */ \
515 p_s16 = ((adec_frame_t *)p_adec->p_aout_fifo->buffer)[ l_end_frame ]; \
516 /* fprintf(stderr, "p_s16 == %p\n", p_s16); */ \
518 l_end_frame &= AOUT_FIFO_SIZE;
519 /* #define NEXT_BUF */
521 #define GROUPTEST( pp_requantization, ppf_sample, pf_sf ) \
522 requantization = *((pp_requantization)[i_sb]); \
523 if ( requantization.pf_ungroup == NULL ) \
525 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
526 i_need += requantization.i_bits_per_codeword; \
527 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * (requantization.f_slope * \
528 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
529 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
530 i_dump += requantization.i_bits_per_codeword; \
532 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
533 i_need += requantization.i_bits_per_codeword; \
534 (ppf_sample)[1][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
535 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
536 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
537 i_dump += requantization.i_bits_per_codeword; \
539 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
540 i_need += requantization.i_bits_per_codeword; \
541 (ppf_sample)[2][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
542 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
543 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
544 i_dump += requantization.i_bits_per_codeword; \
548 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
549 i_need += requantization.i_bits_per_codeword; \
550 pf_ungroup = requantization.pf_ungroup + 3 * \
551 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
552 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
553 i_dump += requantization.i_bits_per_codeword; \
554 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * pf_ungroup[0]; \
555 (ppf_sample)[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
556 (ppf_sample)[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
558 /* #define GROUPTEST */
560 #define READ_SAMPLE_L2S( pf_scalefactor_0, pf_scalefactor_1, i_grlimit ) \
561 for ( ; i_gr < (i_grlimit); i_gr++ ) \
563 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
565 if ( pi_allocation_0[i_sb] ) \
567 GROUPTEST( pp_requantization_0, ppf_sample_0, (pf_scalefactor_0) ) \
569 if ( pi_allocation_1[i_sb] ) \
571 GROUPTEST( pp_requantization_1, ppf_sample_1, (pf_scalefactor_1) ) \
574 for ( ; i_sb < i_sblimit; i_sb++ ) \
576 if ( pi_allocation_0[i_sb] ) \
578 requantization = *(pp_requantization_0[i_sb]); \
579 if ( requantization.pf_ungroup == NULL ) \
581 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
582 i_need += requantization.i_bits_per_codeword; \
583 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * \
584 (requantization.f_slope * (f_dummy = \
585 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
586 requantization.f_offset); \
587 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
588 i_dump += requantization.i_bits_per_codeword; \
589 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * \
590 (requantization.f_slope * f_dummy + requantization.f_offset); \
592 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
593 i_need += requantization.i_bits_per_codeword; \
594 ppf_sample_0[1][i_sb] = f_scalefactor_0 * \
595 (requantization.f_slope * (f_dummy = \
596 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
597 requantization.f_offset); \
598 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
599 i_dump += requantization.i_bits_per_codeword; \
600 ppf_sample_1[1][i_sb] = f_scalefactor_1 * \
601 (requantization.f_slope * f_dummy + requantization.f_offset); \
603 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
604 i_need += requantization.i_bits_per_codeword; \
605 ppf_sample_0[2][i_sb] = f_scalefactor_0 * \
606 (requantization.f_slope * (f_dummy = \
607 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
608 requantization.f_offset); \
609 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
610 i_dump += requantization.i_bits_per_codeword; \
611 ppf_sample_1[2][i_sb] = f_scalefactor_1 * \
612 (requantization.f_slope * f_dummy + requantization.f_offset); \
616 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
617 i_need += requantization.i_bits_per_codeword; \
618 pf_ungroup = requantization.pf_ungroup + 3 * \
619 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
620 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
621 i_dump += requantization.i_bits_per_codeword; \
623 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * pf_ungroup[0]; \
624 ppf_sample_0[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
625 ppf_sample_0[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
627 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * pf_ungroup[0]; \
628 ppf_sample_1[1][i_sb] = f_scalefactor_1 * pf_ungroup[1]; \
629 ppf_sample_1[2][i_sb] = f_scalefactor_1 * pf_ungroup[2]; \
634 /* fprintf(stderr, "%p", p_s16); */ \
635 DCT32( ppf_sample_0[0], &p_adec->bank_0 ); \
636 PCM( &p_adec->bank_0, &p_s16, 2 ); \
637 /* fprintf(stderr, " %p", p_s16); */ \
639 /* fprintf(stderr, " %p\n", p_s16); */ \
641 /* fprintf(stderr, "%p", p_s16); */ \
642 DCT32( ppf_sample_1[0], &p_adec->bank_1 ); \
643 PCM( &p_adec->bank_1, &p_s16, 2 ); \
644 /* fprintf(stderr, " %p", p_s16); */ \
646 /* fprintf(stderr, " %p\n", p_s16); */ \
648 /* fprintf(stderr, "%p", p_s16); */ \
649 DCT32( ppf_sample_0[1], &p_adec->bank_0 ); \
650 PCM( &p_adec->bank_0, &p_s16, 2 ); \
651 /* fprintf(stderr, " %p", p_s16); */ \
653 /* fprintf(stderr, " %p\n", p_s16); */ \
655 /* fprintf(stderr, "%p", p_s16); */ \
656 DCT32( ppf_sample_1[1], &p_adec->bank_1 ); \
657 PCM( &p_adec->bank_1, &p_s16, 2 ); \
658 /* fprintf(stderr, " %p", p_s16); */ \
660 /* fprintf(stderr, " %p\n", p_s16); */ \
662 /* fprintf(stderr, "%p", p_s16); */ \
663 DCT32( ppf_sample_0[2], &p_adec->bank_0 ); \
664 PCM( &p_adec->bank_0, &p_s16, 2 ); \
665 /* fprintf(stderr, " %p", p_s16); */ \
667 /* fprintf(stderr, " %p\n", p_s16); */ \
669 /* fprintf(stderr, "%p", p_s16); */ \
670 DCT32( ppf_sample_1[2], &p_adec->bank_1 ); \
671 PCM( &p_adec->bank_1, &p_s16, 2 ); \
672 /* fprintf(stderr, " %p", p_s16); */ \
674 /* fprintf(stderr, " %p\n", p_s16); */ \
676 /* #define READ_SAMPLE_L2S */
678 l_end_frame = p_adec->p_aout_fifo->l_end_frame;
682 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 2 )
685 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 4 )
688 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 6 )
691 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 8 )
694 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 10 )
697 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 12 )
700 fprintf(stderr, "adec debug: layer == %i, padding_bit == %i, sampling_frequency == %i, bitrate_index == %i\n",
701 (i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT,
702 (i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT,
703 (i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT,
704 (i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT);
705 fprintf(stderr, "adec debug: framesize == %i, i_need == %i, i_dump == %i\n",
706 pi_framesize[ 128 * ((i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT) +
707 64 * ((i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT) +
708 16 * ((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT) +
709 1 * ((i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT) ],
713 p_adec->bit_stream.fifo.buffer = 0;
714 p_adec->bit_stream.fifo.i_available = 0;
718 /*****************************************************************************
719 * InitThread : initialize an audio decoder thread
720 *****************************************************************************
721 * This function is called from RunThread and performs the second step of the
722 * initialization. It returns 0 on success.
723 *****************************************************************************/
724 static int InitThread( adec_thread_t * p_adec )
726 aout_fifo_t aout_fifo;
728 intf_DbgMsg("adec debug: initializing audio decoder thread %p\n", p_adec);
730 /* Our first job is to initialize the bit stream structure with the
731 * beginning of the input stream */
732 vlc_mutex_lock( &p_adec->fifo.data_lock );
733 while ( DECODER_FIFO_ISEMPTY(p_adec->fifo) )
737 vlc_mutex_unlock( &p_adec->fifo.data_lock );
740 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
742 p_adec->bit_stream.p_ts = DECODER_FIFO_START( p_adec->fifo )->p_first_ts;
743 p_adec->bit_stream.p_byte = p_adec->bit_stream.p_ts->buffer + p_adec->bit_stream.p_ts->i_payload_start;
744 p_adec->bit_stream.p_end = p_adec->bit_stream.p_ts->buffer + p_adec->bit_stream.p_ts->i_payload_end;
745 vlc_mutex_unlock( &p_adec->fifo.data_lock );
747 /* Now we look for an audio frame header in the input stream */
748 if ( FindHeader(p_adec) )
750 return( -1 ); /* b_die or b_error is set */
754 * We have the header and all its informations : we must be able to create
755 * the audio output fifo.
758 /* Is the sound in mono mode or stereo mode ? */
759 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
761 intf_DbgMsg("adec debug: mode == mono\n");
762 aout_fifo.i_type = AOUT_ADEC_MONO_FIFO;
763 aout_fifo.i_channels = 1;
764 aout_fifo.b_stereo = 0;
768 intf_DbgMsg("adec debug: mode == stereo\n");
769 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
770 aout_fifo.i_channels = 2;
771 aout_fifo.b_stereo = 1;
774 /* Checking the sampling frequency */
775 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) \
776 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT )
779 intf_DbgMsg("adec debug: sampling_frequency == 44100 Hz\n");
780 aout_fifo.l_rate = 44100;
784 intf_DbgMsg("adec debug: sampling_frequency == 48000 Hz\n");
785 aout_fifo.l_rate = 48000;
789 intf_DbgMsg("adec debug: sampling_frequency == 32000 Hz\n");
790 aout_fifo.l_rate = 32000;
794 intf_ErrMsg("adec error: can't create audio output fifo (sampling_frequency == `reserved')\n");
798 aout_fifo.l_frame_size = ADEC_FRAME_SIZE;
800 /* Creating the audio output fifo */
801 if ( (p_adec->p_aout_fifo = aout_CreateFifo(p_adec->p_aout, &aout_fifo)) == NULL )
806 intf_DbgMsg("adec debug: audio decoder thread %p initialized\n", p_adec);
810 /*****************************************************************************
811 * RunThread : audio decoder thread
812 *****************************************************************************
813 * Audio decoder thread. This function does only returns when the thread is
815 *****************************************************************************/
816 static void RunThread( adec_thread_t * p_adec )
819 static const int pi_framesize[512] = ADEC_FRAME_SIZE;
825 intf_DbgMsg("adec debug: running audio decoder thread (%p) (pid == %i)\n", p_adec, getpid());
827 msleep( INPUT_PTS_DELAY );
829 /* Initializing the audio decoder thread */
830 if ( InitThread(p_adec) )
835 /* Audio decoder thread's main loop */
836 while ( (!p_adec->b_die) && (!p_adec->b_error) )
838 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT )
842 intf_DbgMsg("adec debug: layer == 0 (reserved)\n");
843 p_adec->bit_stream.fifo.buffer = 0;
844 p_adec->bit_stream.fifo.i_available = 0;
849 p_adec->bit_stream.fifo.buffer = 0;
850 p_adec->bit_stream.fifo.i_available = 0;
855 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
857 adec_Layer2_Mono( p_adec );
861 /* Waiting until there is enough free space in the audio output fifo
862 * in order to store the new decoded frames */
863 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
864 /* adec_Layer2_Stereo() produces 6 output frames (2*1152/384)...
865 * If these 6 frames were recorded in the audio output fifo, the
866 * l_end_frame index would be incremented 6 times. But, if after
867 * this operation the audio output fifo contains less than 6 frames,
868 * it would mean that we had not enough room to store the 6 frames :-P */
869 while ( (((p_adec->p_aout_fifo->l_end_frame + 6) - p_adec->p_aout_fifo->l_start_frame) & AOUT_FIFO_SIZE) < 6 ) /* XXX?? */
871 vlc_cond_wait( &p_adec->p_aout_fifo->data_wait, &p_adec->p_aout_fifo->data_lock );
873 if ( DECODER_FIFO_START(p_adec->fifo)->b_has_pts )
875 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(p_adec->fifo)->i_pts;
876 DECODER_FIFO_START(p_adec->fifo)->b_has_pts = 0;
880 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
882 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
884 /* Decoding the frames */
885 if ( adec_Layer2_Stereo(p_adec) )
887 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
890 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
893 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
894 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
897 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
898 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
901 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
902 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
905 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
906 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
909 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
910 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
912 vlc_cond_signal( &p_adec->p_aout_fifo->data_wait );
914 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
921 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
923 adec_Layer1_Mono( p_adec );
927 adec_Layer1_Stereo( p_adec );
932 intf_DbgMsg("adec debug: layer == %i (unknown)\n",
933 (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT);
934 p_adec->bit_stream.fifo.buffer = 0;
935 p_adec->bit_stream.fifo.i_available = 0;
938 FindHeader( p_adec );
941 /* If b_error is set, the audio decoder thread enters the error loop */
942 if ( p_adec->b_error )
944 ErrorThread( p_adec );
947 /* End of the audio decoder thread */
951 /*****************************************************************************
952 * ErrorThread : audio decoder's RunThread() error loop
953 *****************************************************************************
954 * This function is called when an error occured during thread main's loop. The
955 * thread can still receive feed, but must be ready to terminate as soon as
957 *****************************************************************************/
958 static void ErrorThread( adec_thread_t *p_adec )
960 /* We take the lock, because we are going to read/write the start/end
961 * indexes of the decoder fifo */
962 vlc_mutex_lock( &p_adec->fifo.data_lock );
964 /* Wait until a `die' order is sent */
965 while( !p_adec->b_die )
967 /* Trash all received PES packets */
968 while( !DECODER_FIFO_ISEMPTY(p_adec->fifo) )
970 input_NetlistFreePES( p_adec->bit_stream.p_input, DECODER_FIFO_START(p_adec->fifo) );
971 DECODER_FIFO_INCSTART( p_adec->fifo );
974 /* Waiting for the input thread to put new PES packets in the fifo */
975 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
978 /* We can release the lock before leaving */
979 vlc_mutex_unlock( &p_adec->fifo.data_lock );
982 /*****************************************************************************
983 * EndThread : audio decoder thread destruction
984 *****************************************************************************
985 * This function is called when the thread ends after a sucessfull
987 *****************************************************************************/
988 static void EndThread( adec_thread_t *p_adec )
990 intf_DbgMsg("adec debug: destroying audio decoder thread %p\n", p_adec);
992 /* If the audio output fifo was created, we destroy it */
993 if ( p_adec->p_aout_fifo != NULL )
995 aout_DestroyFifo( p_adec->p_aout_fifo );
997 /* Make sure the output thread leaves the NextFrame() function */
998 vlc_mutex_lock( &(p_adec->p_aout_fifo->data_lock) );
999 vlc_cond_signal( &(p_adec->p_aout_fifo->data_wait) );
1000 vlc_mutex_unlock( &(p_adec->p_aout_fifo->data_lock) );
1002 /* Destroy descriptor */
1005 intf_DbgMsg("adec debug: audio decoder thread %p destroyed\n", p_adec);