1 /******************************************************************************
2 * audio_decoder.c: MPEG1 Layer I-II audio decoder thread
4 ******************************************************************************/
9 * - optimiser les NeedBits() et les GetBits() du code là où c'est possible ;
10 * - vlc_cond_signal() / vlc_cond_wait() ;
14 /******************************************************************************
16 ******************************************************************************/
19 #include <stdio.h> /* "intf_msg.h" */
20 #include <stdlib.h> /* malloc(), free() */
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <netinet/in.h> /* ntohl() */
24 #include <sys/soundcard.h> /* "audio_output.h" */
25 #include <sys/uio.h> /* "input.h" */
30 #include "vlc_thread.h"
31 #include "debug.h" /* "input_netlist.h" */
33 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
35 #include "input.h" /* pes_packet_t */
36 #include "input_netlist.h" /* input_NetlistFreePES() */
37 #include "decoder_fifo.h" /* DECODER_FIFO_(ISEMPTY|START|INCSTART)() */
39 #include "audio_output.h"
41 #include "audio_constants.h"
42 #include "audio_decoder.h"
43 #include "audio_math.h"
45 /******************************************************************************
47 ******************************************************************************/
48 static int InitThread ( adec_thread_t * p_adec );
49 static void RunThread ( adec_thread_t * p_adec );
50 static void ErrorThread ( adec_thread_t * p_adec );
51 static void EndThread ( adec_thread_t * p_adec );
54 static int adec_Layer1_Mono ( adec_thread_t * p_adec );
55 static int adec_Layer1_Stereo ( adec_thread_t * p_adec );
56 static int adec_Layer2_Mono ( adec_thread_t * p_adec );
57 static int adec_Layer2_Stereo ( adec_thread_t * p_adec );
59 static byte_t GetByte ( bit_stream_t * p_bit_stream );
60 static void NeedBits ( bit_stream_t * p_bit_stream, int i_bits );
61 static void DumpBits ( bit_stream_t * p_bit_stream, int i_bits );
62 static int FindHeader ( adec_thread_t * p_adec );
65 /******************************************************************************
66 * adec_CreateThread: creates an audio decoder thread
67 ******************************************************************************
68 * This function creates a new audio decoder thread, and returns a pointer to
69 * its description. On error, it returns NULL.
70 ******************************************************************************/
71 adec_thread_t * adec_CreateThread( input_thread_t * p_input )
73 adec_thread_t * p_adec;
75 intf_DbgMsg("adec debug: creating audio decoder thread\n");
77 /* Allocate the memory needed to store the thread's structure */
78 if ( (p_adec = (adec_thread_t *)malloc( sizeof(adec_thread_t) )) == NULL )
80 intf_ErrMsg("adec error: not enough memory for adec_CreateThread() to create the new thread\n");
85 * Initialize the thread properties
91 * Initialize the input properties
93 /* Initialize the decoder fifo's data lock and conditional variable and set
94 * its buffer as empty */
95 vlc_mutex_init( &p_adec->fifo.data_lock );
96 vlc_cond_init( &p_adec->fifo.data_wait );
97 p_adec->fifo.i_start = 0;
98 p_adec->fifo.i_end = 0;
99 /* Initialize the bit stream structure */
100 p_adec->bit_stream.p_input = p_input;
101 p_adec->bit_stream.p_decoder_fifo = &p_adec->fifo;
102 p_adec->bit_stream.fifo.buffer = 0;
103 p_adec->bit_stream.fifo.i_available = 0;
106 * Initialize the decoder properties
108 p_adec->bank_0.actual = p_adec->bank_0.v1;
109 p_adec->bank_0.pos = 0;
110 p_adec->bank_1.actual = p_adec->bank_1.v1;
111 p_adec->bank_1.pos = 0;
114 * Initialize the output properties
116 p_adec->p_aout = p_input->p_aout;
117 p_adec->p_aout_fifo = NULL;
119 /* Spawn the audio decoder thread */
120 if ( vlc_thread_create(&p_adec->thread_id, "audio decoder", (vlc_thread_func_t)RunThread, (void *)p_adec) )
122 intf_ErrMsg("adec error: can't spawn audio decoder thread\n");
127 intf_DbgMsg("adec debug: audio decoder thread (%p) created\n", p_adec);
131 /******************************************************************************
132 * adec_DestroyThread: destroys an audio decoder thread
133 ******************************************************************************
134 * This function asks an audio decoder thread to terminate. This function has
135 * not to wait until the decoder thread has really died, because the killer (ie
136 * this function's caller) is the input thread, that's why we are sure that no
137 * other thread will try to access to this thread's descriptor after its
139 ******************************************************************************/
140 void adec_DestroyThread( adec_thread_t * p_adec )
142 intf_DbgMsg("adec debug: requesting termination of audio decoder thread %p\n", p_adec);
144 /* Ask thread to kill itself */
147 /* Make sure the decoder thread leaves the GetByte() function */
148 vlc_mutex_lock( &(p_adec->fifo.data_lock) );
149 vlc_cond_signal( &(p_adec->fifo.data_wait) );
150 vlc_mutex_unlock( &(p_adec->fifo.data_lock) );
152 /* Waiting for the decoder thread to exit */
153 /* Remove this as soon as the "status" flag is implemented */
154 vlc_thread_join( p_adec->thread_id );
157 /* Following functions are local */
159 /******************************************************************************
160 * FindHeader : parses an input stream until an audio frame header could be
162 ******************************************************************************
163 * When this function returns successfully, the header can be found in the
164 * buffer of the bit stream fifo.
165 ******************************************************************************/
166 static int FindHeader( adec_thread_t * p_adec )
168 while ( (!p_adec->b_die) && (!p_adec->b_error) )
170 NeedBits( &p_adec->bit_stream, 32 );
171 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SYNCWORD_MASK) == ADEC_HEADER_SYNCWORD_MASK )
175 DumpBits( &p_adec->bit_stream, 8 );
181 /******************************************************************************
182 * adec_Layer`L'_`M': decodes an mpeg 1, layer `L', mode `M', audio frame
183 ******************************************************************************
184 * These functions decode the audio frame which has already its header loaded
185 * in the i_header member of the audio decoder thread structure and its first
186 * byte of data described by the bit stream structure of the audio decoder
187 * thread (there is no bit available in the bit buffer yet)
188 ******************************************************************************/
190 /******************************************************************************
192 ******************************************************************************/
193 static __inline__ int adec_Layer1_Mono( adec_thread_t * p_adec )
195 p_adec->bit_stream.fifo.buffer = 0;
196 p_adec->bit_stream.fifo.i_available = 0;
200 /******************************************************************************
202 ******************************************************************************/
203 static __inline__ int adec_Layer1_Stereo( adec_thread_t * p_adec )
205 p_adec->bit_stream.fifo.buffer = 0;
206 p_adec->bit_stream.fifo.i_available = 0;
210 /******************************************************************************
212 ******************************************************************************/
213 static __inline__ int adec_Layer2_Mono( adec_thread_t * p_adec )
215 p_adec->bit_stream.fifo.buffer = 0;
216 p_adec->bit_stream.fifo.i_available = 0;
220 /******************************************************************************
222 ******************************************************************************/
223 static __inline__ int adec_Layer2_Stereo( adec_thread_t * p_adec )
225 typedef struct requantization_s
227 byte_t i_bits_per_codeword;
228 const float * pf_ungroup;
233 static const float pf_scalefactor[64] = ADEC_SCALE_FACTOR;
236 static int i_sampling_frequency, i_mode, i_bound;
237 static int pi_allocation_0[32], pi_allocation_1[32]; /* see ISO/IEC 11172-3 2.4.1.6 */
239 float f_scalefactor_0, f_scalefactor_1;
241 static const byte_t ppi_bitrate_per_channel_index[4][15] = ADEC_LAYER2_BITRATE_PER_CHANNEL_INDEX;
242 static const byte_t ppi_sblimit[3][11] = ADEC_LAYER2_SBLIMIT;
243 static const byte_t ppi_nbal[2][32] = ADEC_LAYER2_NBAL;
245 static const float pf_ungroup3[3*3*3 * 3] = ADEC_LAYER2_UNGROUP3;
246 static const float pf_ungroup5[5*5*5 * 3] = ADEC_LAYER2_UNGROUP5;
247 static const float pf_ungroup9[9*9*9 * 3] = ADEC_LAYER2_UNGROUP9;
249 static const requantization_t p_requantization_cd[16] = ADEC_LAYER2_REQUANTIZATION_CD;
250 static const requantization_t p_requantization_ab1[16] = ADEC_LAYER2_REQUANTIZATION_AB1;
251 static const requantization_t p_requantization_ab2[16] = ADEC_LAYER2_REQUANTIZATION_AB2;
252 static const requantization_t p_requantization_ab3[16] = ADEC_LAYER2_REQUANTIZATION_AB3;
253 static const requantization_t p_requantization_ab4[16] = ADEC_LAYER2_REQUANTIZATION_AB4;
254 static const requantization_t * pp_requantization_ab[30] = ADEC_LAYER2_REQUANTIZATION_AB;
256 static int i_sblimit, i_bitrate_per_channel_index;
257 static int pi_scfsi_0[30], pi_scfsi_1[30];
258 static const byte_t * pi_nbal;
259 static float ppf_sample_0[3][32], ppf_sample_1[3][32];
260 static const requantization_t * pp_requantization_0[30];
261 static const requantization_t * pp_requantization_1[30];
262 static requantization_t requantization;
263 static const float * pf_ungroup;
265 static float pf_scalefactor_0_0[30], pf_scalefactor_0_1[30], pf_scalefactor_0_2[30];
266 static float pf_scalefactor_1_0[30], pf_scalefactor_1_1[30], pf_scalefactor_1_2[30];
274 int i_need = 0, i_dump = 0;
275 // static const int pi_framesize[512] = ADEC_FRAME_SIZE;
277 /* Read the audio frame header and flush the bit buffer */
278 i_header = p_adec->bit_stream.fifo.buffer;
279 p_adec->bit_stream.fifo.buffer = 0;
280 p_adec->bit_stream.fifo.i_available = 0;
281 /* Read the sampling frequency (see ISO/IEC 11172-3 2.4.2.3) */
282 i_sampling_frequency = (int)((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK)
283 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT);
284 /* Read the mode (see ISO/IEC 11172-3 2.4.2.3) */
285 i_mode = (int)((i_header & ADEC_HEADER_MODE_MASK) >> ADEC_HEADER_MODE_SHIFT);
286 /* If a CRC can be found in the frame, get rid of it */
287 if ( (i_header & ADEC_HEADER_PROTECTION_BIT_MASK) == 0 )
289 GetByte( &p_adec->bit_stream );
290 GetByte( &p_adec->bit_stream );
293 /* Find out the bitrate per channel index */
294 i_bitrate_per_channel_index = (int)ppi_bitrate_per_channel_index[i_mode]
295 [(i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT];
296 /* Find out the number of subbands */
297 i_sblimit = (int)ppi_sblimit[i_sampling_frequency][i_bitrate_per_channel_index];
298 /* Check if the frame is valid or not */
299 if ( i_sblimit == 0 )
301 return( 0 ); /* the frame is invalid */
303 /* Find out the number of bits allocated */
304 pi_nbal = ppi_nbal[ (i_bitrate_per_channel_index <= 2) ? 0 : 1 ];
306 /* Find out the `bound' subband (see ISO/IEC 11172-3 2.4.2.3) */
309 i_bound = (int)(((i_header & ADEC_HEADER_MODE_EXTENSION_MASK) >> (ADEC_HEADER_MODE_EXTENSION_SHIFT - 2)) + 4);
310 if ( i_bound > i_sblimit )
320 /* Read the allocation information (see ISO/IEC 11172-3 2.4.1.6) */
321 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
323 i_2nbal = 2 * (i_nbal = (int)pi_nbal[ i_sb ]);
324 NeedBits( &p_adec->bit_stream, i_2nbal );
326 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
327 p_adec->bit_stream.fifo.buffer <<= i_nbal;
328 pi_allocation_1[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
329 p_adec->bit_stream.fifo.buffer <<= i_nbal;
330 p_adec->bit_stream.fifo.i_available -= i_2nbal;
333 for ( ; i_sb < i_sblimit; i_sb++ )
335 i_nbal = (int)pi_nbal[ i_sb ];
336 NeedBits( &p_adec->bit_stream, i_nbal );
338 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
339 DumpBits( &p_adec->bit_stream, i_nbal );
343 #define MACRO( p_requantization ) \
344 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
346 if ( pi_allocation_0[i_sb] ) \
348 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
349 NeedBits( &p_adec->bit_stream, 2 ); \
351 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
352 DumpBits( &p_adec->bit_stream, 2 ); \
357 ppf_sample_0[0][i_sb] = .0; \
358 ppf_sample_0[1][i_sb] = .0; \
359 ppf_sample_0[2][i_sb] = .0; \
362 if ( pi_allocation_1[i_sb] ) \
364 pp_requantization_1[i_sb] = &((p_requantization)[pi_allocation_1[i_sb]]); \
365 NeedBits( &p_adec->bit_stream, 2 ); \
367 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
368 DumpBits( &p_adec->bit_stream, 2 ); \
373 ppf_sample_1[0][i_sb] = .0; \
374 ppf_sample_1[1][i_sb] = .0; \
375 ppf_sample_1[2][i_sb] = .0; \
379 for ( ; i_sb < i_sblimit; i_sb++ ) \
381 if ( pi_allocation_0[i_sb] ) \
383 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
384 NeedBits( &p_adec->bit_stream, 4 ); \
386 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
387 p_adec->bit_stream.fifo.buffer <<= 2; \
388 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
389 p_adec->bit_stream.fifo.buffer <<= 2; \
390 p_adec->bit_stream.fifo.i_available -= 4; \
395 ppf_sample_0[0][i_sb] = .0; \
396 ppf_sample_0[1][i_sb] = .0; \
397 ppf_sample_0[2][i_sb] = .0; \
398 ppf_sample_1[0][i_sb] = .0; \
399 ppf_sample_1[1][i_sb] = .0; \
400 ppf_sample_1[2][i_sb] = .0; \
405 if ( i_bitrate_per_channel_index <= 2 )
407 MACRO( p_requantization_cd )
411 MACRO( pp_requantization_ab[i_sb] )
414 #define SWITCH( pi_scfsi, pf_scalefactor_0, pf_scalefactor_1, pf_scalefactor_2 ) \
415 switch ( (pi_scfsi)[i_sb] ) \
418 NeedBits( &p_adec->bit_stream, (3*6) ); \
420 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
421 p_adec->bit_stream.fifo.buffer <<= 6; \
422 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
423 p_adec->bit_stream.fifo.buffer <<= 6; \
424 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
425 p_adec->bit_stream.fifo.buffer <<= 6; \
426 p_adec->bit_stream.fifo.i_available -= (3*6); \
431 NeedBits( &p_adec->bit_stream, (2*6) ); \
433 (pf_scalefactor_0)[i_sb] = \
434 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
435 p_adec->bit_stream.fifo.buffer <<= 6; \
436 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
437 p_adec->bit_stream.fifo.buffer <<= 6; \
438 p_adec->bit_stream.fifo.i_available -= (2*6); \
443 NeedBits( &p_adec->bit_stream, (1*6) ); \
445 (pf_scalefactor_0)[i_sb] = \
446 (pf_scalefactor_1)[i_sb] = \
447 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
448 DumpBits( &p_adec->bit_stream, (1*6) ); \
453 NeedBits( &p_adec->bit_stream, (2*6) ); \
455 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
456 p_adec->bit_stream.fifo.buffer <<= 6; \
457 (pf_scalefactor_1)[i_sb] = \
458 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
459 p_adec->bit_stream.fifo.buffer <<= 6; \
460 p_adec->bit_stream.fifo.i_available -= (2*6); \
466 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
468 if ( pi_allocation_0[i_sb] )
470 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
472 if ( pi_allocation_1[i_sb] )
474 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
477 for ( ; i_sb < i_sblimit; i_sb++ )
479 if ( pi_allocation_0[i_sb] )
481 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
482 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
485 for ( ; i_sb < 32; i_sb++ )
487 ppf_sample_0[0][i_sb] = .0;
488 ppf_sample_0[1][i_sb] = .0;
489 ppf_sample_0[2][i_sb] = .0;
490 ppf_sample_1[0][i_sb] = .0;
491 ppf_sample_1[1][i_sb] = .0;
492 ppf_sample_1[2][i_sb] = .0;
496 /* fprintf(stderr, "%p\n", p_adec->p_aout_fifo->buffer); */ \
497 /* fprintf(stderr, "l_end_frame == %li, %p\n", l_end_frame, (aout_frame_t *)p_adec->p_aout_fifo->buffer + l_end_frame); */ \
498 p_s16 = ((adec_frame_t *)p_adec->p_aout_fifo->buffer)[ l_end_frame ]; \
499 /* fprintf(stderr, "p_s16 == %p\n", p_s16); */ \
501 l_end_frame &= AOUT_FIFO_SIZE;
502 /* #define NEXT_BUF */
504 #define GROUPTEST( pp_requantization, ppf_sample, pf_sf ) \
505 requantization = *((pp_requantization)[i_sb]); \
506 if ( requantization.pf_ungroup == NULL ) \
508 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
509 i_need += requantization.i_bits_per_codeword; \
510 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * (requantization.f_slope * \
511 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
512 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
513 i_dump += requantization.i_bits_per_codeword; \
515 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
516 i_need += requantization.i_bits_per_codeword; \
517 (ppf_sample)[1][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
518 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
519 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
520 i_dump += requantization.i_bits_per_codeword; \
522 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
523 i_need += requantization.i_bits_per_codeword; \
524 (ppf_sample)[2][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
525 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
526 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
527 i_dump += requantization.i_bits_per_codeword; \
531 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
532 i_need += requantization.i_bits_per_codeword; \
533 pf_ungroup = requantization.pf_ungroup + 3 * \
534 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
535 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
536 i_dump += requantization.i_bits_per_codeword; \
537 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * pf_ungroup[0]; \
538 (ppf_sample)[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
539 (ppf_sample)[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
541 /* #define GROUPTEST */
543 #define READ_SAMPLE_L2S( pf_scalefactor_0, pf_scalefactor_1, i_grlimit ) \
544 for ( ; i_gr < (i_grlimit); i_gr++ ) \
546 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
548 if ( pi_allocation_0[i_sb] ) \
550 GROUPTEST( pp_requantization_0, ppf_sample_0, (pf_scalefactor_0) ) \
552 if ( pi_allocation_1[i_sb] ) \
554 GROUPTEST( pp_requantization_1, ppf_sample_1, (pf_scalefactor_1) ) \
557 for ( ; i_sb < i_sblimit; i_sb++ ) \
559 if ( pi_allocation_0[i_sb] ) \
561 requantization = *(pp_requantization_0[i_sb]); \
562 if ( requantization.pf_ungroup == NULL ) \
564 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
565 i_need += requantization.i_bits_per_codeword; \
566 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * \
567 (requantization.f_slope * (f_dummy = \
568 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
569 requantization.f_offset); \
570 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
571 i_dump += requantization.i_bits_per_codeword; \
572 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * \
573 (requantization.f_slope * f_dummy + requantization.f_offset); \
575 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
576 i_need += requantization.i_bits_per_codeword; \
577 ppf_sample_0[1][i_sb] = f_scalefactor_0 * \
578 (requantization.f_slope * (f_dummy = \
579 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
580 requantization.f_offset); \
581 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
582 i_dump += requantization.i_bits_per_codeword; \
583 ppf_sample_1[1][i_sb] = f_scalefactor_1 * \
584 (requantization.f_slope * f_dummy + requantization.f_offset); \
586 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
587 i_need += requantization.i_bits_per_codeword; \
588 ppf_sample_0[2][i_sb] = f_scalefactor_0 * \
589 (requantization.f_slope * (f_dummy = \
590 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
591 requantization.f_offset); \
592 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
593 i_dump += requantization.i_bits_per_codeword; \
594 ppf_sample_1[2][i_sb] = f_scalefactor_1 * \
595 (requantization.f_slope * f_dummy + requantization.f_offset); \
599 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
600 i_need += requantization.i_bits_per_codeword; \
601 pf_ungroup = requantization.pf_ungroup + 3 * \
602 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
603 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
604 i_dump += requantization.i_bits_per_codeword; \
606 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * pf_ungroup[0]; \
607 ppf_sample_0[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
608 ppf_sample_0[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
610 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * pf_ungroup[0]; \
611 ppf_sample_1[1][i_sb] = f_scalefactor_1 * pf_ungroup[1]; \
612 ppf_sample_1[2][i_sb] = f_scalefactor_1 * pf_ungroup[2]; \
617 /* fprintf(stderr, "%p", p_s16); */ \
618 DCT32( ppf_sample_0[0], &p_adec->bank_0 ); \
619 PCM( &p_adec->bank_0, &p_s16, 2 ); \
620 /* fprintf(stderr, " %p", p_s16); */ \
622 /* fprintf(stderr, " %p\n", p_s16); */ \
624 /* fprintf(stderr, "%p", p_s16); */ \
625 DCT32( ppf_sample_1[0], &p_adec->bank_1 ); \
626 PCM( &p_adec->bank_1, &p_s16, 2 ); \
627 /* fprintf(stderr, " %p", p_s16); */ \
629 /* fprintf(stderr, " %p\n", p_s16); */ \
631 /* fprintf(stderr, "%p", p_s16); */ \
632 DCT32( ppf_sample_0[1], &p_adec->bank_0 ); \
633 PCM( &p_adec->bank_0, &p_s16, 2 ); \
634 /* fprintf(stderr, " %p", p_s16); */ \
636 /* fprintf(stderr, " %p\n", p_s16); */ \
638 /* fprintf(stderr, "%p", p_s16); */ \
639 DCT32( ppf_sample_1[1], &p_adec->bank_1 ); \
640 PCM( &p_adec->bank_1, &p_s16, 2 ); \
641 /* fprintf(stderr, " %p", p_s16); */ \
643 /* fprintf(stderr, " %p\n", p_s16); */ \
645 /* fprintf(stderr, "%p", p_s16); */ \
646 DCT32( ppf_sample_0[2], &p_adec->bank_0 ); \
647 PCM( &p_adec->bank_0, &p_s16, 2 ); \
648 /* fprintf(stderr, " %p", p_s16); */ \
650 /* fprintf(stderr, " %p\n", p_s16); */ \
652 /* fprintf(stderr, "%p", p_s16); */ \
653 DCT32( ppf_sample_1[2], &p_adec->bank_1 ); \
654 PCM( &p_adec->bank_1, &p_s16, 2 ); \
655 /* fprintf(stderr, " %p", p_s16); */ \
657 /* fprintf(stderr, " %p\n", p_s16); */ \
659 /* #define READ_SAMPLE_L2S */
661 l_end_frame = p_adec->p_aout_fifo->l_end_frame;
665 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 2 )
668 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 4 )
671 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 6 )
674 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 8 )
677 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 10 )
680 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 12 )
682 // fprintf(stderr, "adec debug: layer == %i, padding_bit == %i, sampling_frequency == %i, bitrate_index == %i\n",
683 // (i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT,
684 // (i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT,
685 // (i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT,
686 // (i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT);
687 // fprintf(stderr, "adec debug: framesize == %i, i_need == %i, i_dump == %i\n",
688 // pi_framesize[ 128 * ((i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT) +
689 // 64 * ((i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT) +
690 // 16 * ((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT) +
691 // 1 * ((i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT) ],
694 p_adec->bit_stream.fifo.buffer = 0;
695 p_adec->bit_stream.fifo.i_available = 0;
699 /******************************************************************************
700 * InitThread : initialize an audio decoder thread
701 ******************************************************************************
702 * This function is called from RunThread and performs the second step of the
703 * initialization. It returns 0 on success.
704 ******************************************************************************/
705 static int InitThread( adec_thread_t * p_adec )
707 aout_fifo_t aout_fifo;
709 intf_DbgMsg("adec debug: initializing audio decoder thread %p\n", p_adec);
711 /* Our first job is to initialize the bit stream structure with the
712 * beginning of the input stream */
713 vlc_mutex_lock( &p_adec->fifo.data_lock );
714 while ( DECODER_FIFO_ISEMPTY(p_adec->fifo) )
716 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
717 if ( p_adec->bit_stream.p_input->b_die )
719 vlc_mutex_unlock( &p_adec->fifo.data_lock );
723 p_adec->bit_stream.p_ts = DECODER_FIFO_START( p_adec->fifo )->p_first_ts;
724 p_adec->bit_stream.i_byte = p_adec->bit_stream.p_ts->i_payload_start;
725 vlc_mutex_unlock( &p_adec->fifo.data_lock );
727 /* Now we look for an audio frame header in the input stream */
728 if ( FindHeader(p_adec) )
730 return( -1 ); /* b_die or b_error is set */
734 * We have the header and all its informations : we must be able to create
735 * the audio output fifo.
738 /* Is the sound in mono mode or stereo mode ? */
739 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
741 intf_DbgMsg("adec debug: mode == mono\n");
742 aout_fifo.i_type = AOUT_ADEC_MONO_FIFO;
743 aout_fifo.b_stereo = 0;
747 intf_DbgMsg("adec debug: mode == stereo\n");
748 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
749 aout_fifo.b_stereo = 1;
752 /* Checking the sampling frequency */
753 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) \
754 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT )
757 intf_DbgMsg("adec debug: sampling_frequency == 44100 Hz\n");
758 aout_fifo.l_rate = 44100;
762 intf_DbgMsg("adec debug: sampling_frequency == 48000 Hz\n");
763 aout_fifo.l_rate = 48000;
767 intf_DbgMsg("adec debug: sampling_frequency == 32000 Hz\n");
768 aout_fifo.l_rate = 32000;
772 intf_ErrMsg("adec error: can't create audio output fifo (sampling_frequency == `reserved')\n");
776 aout_fifo.l_frame_size = ADEC_FRAME_SIZE;
778 /* Creating the audio output fifo */
779 if ( (p_adec->p_aout_fifo = aout_CreateFifo(p_adec->p_aout, &aout_fifo)) == NULL )
784 intf_DbgMsg("adec debug: audio decoder thread %p initialized\n", p_adec);
788 /******************************************************************************
789 * RunThread : audio decoder thread
790 ******************************************************************************
791 * Audio decoder thread. This function does only returns when the thread is
793 ******************************************************************************/
794 static void RunThread( adec_thread_t * p_adec )
796 // static const int pi_framesize[512] = ADEC_FRAME_SIZE;
801 intf_DbgMsg("adec debug: running audio decoder thread (%p) (pid == %i)\n", p_adec, getpid());
803 msleep( (3 * INPUT_PTS_DELAY) / 4 );
805 /* Initializing the audio decoder thread */
806 if ( InitThread(p_adec) )
811 /* Audio decoder thread's main loop */
812 while ( (!p_adec->b_die) && (!p_adec->b_error) )
814 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT )
818 intf_DbgMsg("adec debug: layer == 0 (reserved)\n");
819 p_adec->bit_stream.fifo.buffer = 0;
820 p_adec->bit_stream.fifo.i_available = 0;
825 p_adec->bit_stream.fifo.buffer = 0;
826 p_adec->bit_stream.fifo.i_available = 0;
831 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
833 adec_Layer2_Mono( p_adec );
837 /* Waiting until there is enough free space in the audio output fifo
838 * in order to store the new decoded frames */
839 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
840 /* adec_Layer2_Stereo() produces 6 output frames (2*1152/384)...
841 * If these 6 frames were recorded in the audio output fifo, the
842 * l_end_frame index would be incremented 6 times. But, if after
843 * this operation the audio output fifo contains less than 6 frames,
844 * it would mean that we had not enough room to store the 6 frames :-P */
845 while ( (((p_adec->p_aout_fifo->l_end_frame + 6) - p_adec->p_aout_fifo->l_start_frame) & AOUT_FIFO_SIZE) < 6 ) /* !! */
847 vlc_cond_wait( &p_adec->p_aout_fifo->data_wait, &p_adec->p_aout_fifo->data_lock );
849 if ( DECODER_FIFO_START(p_adec->fifo)->b_has_pts )
851 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(p_adec->fifo)->i_pts;
852 DECODER_FIFO_START(p_adec->fifo)->b_has_pts = 0;
856 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
858 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
860 /* Decoding the frames */
861 if ( adec_Layer2_Stereo(p_adec) )
863 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
866 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
869 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
870 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
873 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
874 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
877 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
878 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
881 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
882 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
885 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
886 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
888 vlc_cond_signal( &p_adec->p_aout_fifo->data_wait );
890 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
897 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
899 adec_Layer1_Mono( p_adec );
903 adec_Layer1_Stereo( p_adec );
908 intf_DbgMsg("adec debug: layer == %i (unknown)\n",
909 (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT);
910 p_adec->bit_stream.fifo.buffer = 0;
911 p_adec->bit_stream.fifo.i_available = 0;
914 FindHeader( p_adec );
917 /* If b_error is set, the audio decoder thread enters the error loop */
918 if ( p_adec->b_error )
920 ErrorThread( p_adec );
923 /* End of the audio decoder thread */
927 /******************************************************************************
928 * ErrorThread : audio decoder's RunThread() error loop
929 ******************************************************************************
930 * This function is called when an error occured during thread main's loop. The
931 * thread can still receive feed, but must be ready to terminate as soon as
933 ******************************************************************************/
934 static void ErrorThread( adec_thread_t *p_adec )
936 /* We take the lock, because we are going to read/write the start/end
937 * indexes of the decoder fifo */
938 vlc_mutex_lock( &p_adec->fifo.data_lock );
940 /* Wait until a `die' order is sent */
941 while( !p_adec->b_die )
943 /* Trash all received PES packets */
944 while( !DECODER_FIFO_ISEMPTY(p_adec->fifo) )
946 input_NetlistFreePES( p_adec->bit_stream.p_input, DECODER_FIFO_START(p_adec->fifo) );
947 DECODER_FIFO_INCSTART( p_adec->fifo );
950 /* Waiting for the input thread to put new PES packets in the fifo */
951 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
954 /* We can release the lock before leaving */
955 vlc_mutex_unlock( &p_adec->fifo.data_lock );
958 /******************************************************************************
959 * EndThread : audio decoder thread destruction
960 ******************************************************************************
961 * This function is called when the thread ends after a sucessfull
963 ******************************************************************************/
964 static void EndThread( adec_thread_t *p_adec )
966 intf_DbgMsg("adec debug: destroying audio decoder thread %p\n", p_adec);
968 /* If the audio output fifo was created, we destroy it */
969 if ( p_adec->p_aout_fifo != NULL )
971 aout_DestroyFifo( p_adec->p_aout_fifo );
973 /* Make sure the output thread leaves the NextFrame() function */
974 vlc_mutex_lock( &(p_adec->p_aout_fifo->data_lock) );
975 vlc_cond_signal( &(p_adec->p_aout_fifo->data_wait) );
976 vlc_mutex_unlock( &(p_adec->p_aout_fifo->data_lock) );
978 /* Destroy descriptor */
981 intf_DbgMsg("adec debug: audio decoder thread %p destroyed\n", p_adec);