1 /******************************************************************************
2 * audio_decoder.c: MPEG1 Layer I-II audio decoder thread
4 ******************************************************************************/
8 * - Optimiser les NeedBits() et les GetBits() du code là où c'est possible
11 /******************************************************************************
13 ******************************************************************************/
16 #include <stdio.h> /* "intf_msg.h" */
17 #include <stdlib.h> /* malloc(), free() */
18 #include <netinet/in.h> /* ntohl() */
19 #include <sys/soundcard.h> /* "audio_output.h" */
20 #include <sys/uio.h> /* "input.h" */
25 #include "vlc_thread.h"
26 #include "debug.h" /* "input_netlist.h" */
28 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
30 #include "input.h" /* pes_packet_t */
31 #include "input_netlist.h" /* input_NetlistFreePES() */
32 #include "decoder_fifo.h" /* DECODER_FIFO_(ISEMPTY|START|INCSTART)() */
34 #include "audio_output.h"
36 #include "audio_constants.h"
37 #include "audio_decoder.h"
38 #include "audio_math.h"
40 /******************************************************************************
42 ******************************************************************************/
43 static int InitThread ( adec_thread_t * p_adec );
44 static void RunThread ( adec_thread_t * p_adec );
45 static void ErrorThread ( adec_thread_t * p_adec );
46 static void EndThread ( adec_thread_t * p_adec );
48 static int adec_Layer1_Mono ( adec_thread_t * p_adec );
49 static int adec_Layer1_Stereo ( adec_thread_t * p_adec );
50 static int adec_Layer2_Mono ( adec_thread_t * p_adec );
51 static int adec_Layer2_Stereo ( adec_thread_t * p_adec );
53 static byte_t GetByte ( bit_stream_t * p_bit_stream );
54 static void NeedBits ( bit_stream_t * p_bit_stream, int i_bits );
55 static void DumpBits ( bit_stream_t * p_bit_stream, int i_bits );
56 static int FindHeader ( adec_thread_t * p_adec );
58 /******************************************************************************
59 * adec_CreateThread: creates an audio decoder thread
60 ******************************************************************************
61 * This function creates a new audio decoder thread, and returns a pointer to
62 * its description. On error, it returns NULL.
63 ******************************************************************************/
64 adec_thread_t * adec_CreateThread( input_thread_t * p_input )
66 adec_thread_t * p_adec;
68 intf_DbgMsg("adec debug: creating audio decoder thread\n");
70 /* Allocate the memory needed to store the thread's structure */
71 if ( (p_adec = (adec_thread_t *)malloc( sizeof(adec_thread_t) )) == NULL )
73 intf_ErrMsg("adec error: not enough memory for adec_CreateThread() to create the new thread\n");
78 * Initialize the thread properties
84 * Initialize the input properties
86 /* Initialize the decoder fifo's data lock and conditional variable and set
87 * its buffer as empty */
88 vlc_mutex_init( &p_adec->fifo.data_lock );
89 vlc_cond_init( &p_adec->fifo.data_wait );
90 p_adec->fifo.i_start = 0;
91 p_adec->fifo.i_end = 0;
92 /* Initialize the bit stream structure */
93 p_adec->bit_stream.p_input = p_input;
94 p_adec->bit_stream.p_decoder_fifo = &p_adec->fifo;
95 p_adec->bit_stream.fifo.buffer = 0;
96 p_adec->bit_stream.fifo.i_available = 0;
99 * Initialize the decoder properties
101 p_adec->bank_0.actual = p_adec->bank_0.v1;
102 p_adec->bank_0.pos = 0;
103 p_adec->bank_1.actual = p_adec->bank_1.v1;
104 p_adec->bank_1.pos = 0;
107 * Initialize the output properties
109 p_adec->p_aout = p_input->p_aout;
110 p_adec->p_aout_fifo = NULL;
112 /* Spawn the audio decoder thread */
113 if ( vlc_thread_create(&p_adec->thread_id, "audio decoder", (vlc_thread_func)RunThread, (void *)p_adec) )
115 intf_ErrMsg("adec error: can't spawn audio decoder thread\n");
120 intf_DbgMsg("adec debug: audio decoder thread (%p) created\n", p_adec);
124 /******************************************************************************
125 * adec_DestroyThread: destroys an audio decoder thread
126 ******************************************************************************
127 * This function asks an audio decoder thread to terminate. This function has
128 * not to wait until the decoder thread has really died, because the killer (ie
129 * this function's caller) is the input thread, that's why we are sure that no
130 * other thread will try to access to this thread's descriptor after its
132 ******************************************************************************/
133 void adec_DestroyThread( adec_thread_t * p_adec )
135 intf_DbgMsg("adec debug: requesting termination of audio decoder thread %p\n", p_adec);
137 /* Ask thread to kill itself */
139 /* Make sure the decoder thread leaves the GetByte() function */
140 vlc_mutex_lock( &(p_adec->fifo.data_lock) );
141 vlc_cond_signal( &(p_adec->fifo.data_wait) );
142 vlc_mutex_unlock( &(p_adec->fifo.data_lock) );
144 /* Waiting for the decoder thread to exit */
145 /* Remove this as soon as the "status" flag is implemented */
146 vlc_thread_join( p_adec->thread_id );
149 /* Following functions are local */
151 /******************************************************************************
152 * FindHeader : parses an input stream until an audio frame header could be
154 ******************************************************************************
155 * When this function returns successfully, the header can be found in the
156 * buffer of the bit stream fifo.
157 ******************************************************************************/
158 static int FindHeader( adec_thread_t * p_adec )
160 while ( (!p_adec->b_die) && (!p_adec->b_error) )
162 NeedBits( &p_adec->bit_stream, 32 );
163 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SYNCWORD_MASK) == ADEC_HEADER_SYNCWORD_MASK )
167 DumpBits( &p_adec->bit_stream, 8 );
173 /******************************************************************************
174 * adec_Layer`L'_`M': decodes an mpeg 1, layer `L', mode `M', audio frame
175 ******************************************************************************
176 * These functions decode the audio frame which has already its header loaded
177 * in the i_header member of the audio decoder thread structure and its first
178 * byte of data described by the bit stream structure of the audio decoder
179 * thread (there is no bit available in the bit buffer yet)
180 ******************************************************************************/
182 /******************************************************************************
184 ******************************************************************************/
185 static __inline__ int adec_Layer1_Mono( adec_thread_t * p_adec )
187 p_adec->bit_stream.fifo.buffer = 0;
188 p_adec->bit_stream.fifo.i_available = 0;
192 /******************************************************************************
194 ******************************************************************************/
195 static __inline__ int adec_Layer1_Stereo( adec_thread_t * p_adec )
197 p_adec->bit_stream.fifo.buffer = 0;
198 p_adec->bit_stream.fifo.i_available = 0;
202 /******************************************************************************
204 ******************************************************************************/
205 static __inline__ int adec_Layer2_Mono( adec_thread_t * p_adec )
207 p_adec->bit_stream.fifo.buffer = 0;
208 p_adec->bit_stream.fifo.i_available = 0;
212 /******************************************************************************
214 ******************************************************************************/
215 static __inline__ int adec_Layer2_Stereo( adec_thread_t * p_adec )
217 typedef struct requantization_s
219 byte_t i_bits_per_codeword;
220 const float * pf_ungroup;
225 static const float pf_scalefactor[64] = ADEC_SCALE_FACTOR;
228 static int i_sampling_frequency, i_mode, i_bound;
229 static int pi_allocation_0[32], pi_allocation_1[32]; /* see ISO/IEC 11172-3 2.4.1.6 */
231 float f_scalefactor_0, f_scalefactor_1;
233 static const byte_t ppi_bitrate_per_channel_index[4][15] = ADEC_LAYER2_BITRATE_PER_CHANNEL_INDEX;
234 static const byte_t ppi_sblimit[3][11] = ADEC_LAYER2_SBLIMIT;
235 static const byte_t ppi_nbal[2][32] = ADEC_LAYER2_NBAL;
237 static const float pf_ungroup3[3*3*3 * 3] = ADEC_LAYER2_UNGROUP3;
238 static const float pf_ungroup5[5*5*5 * 3] = ADEC_LAYER2_UNGROUP5;
239 static const float pf_ungroup9[9*9*9 * 3] = ADEC_LAYER2_UNGROUP9;
241 static const requantization_t p_requantization_cd[16] = ADEC_LAYER2_REQUANTIZATION_CD;
242 static const requantization_t p_requantization_ab1[16] = ADEC_LAYER2_REQUANTIZATION_AB1;
243 static const requantization_t p_requantization_ab2[16] = ADEC_LAYER2_REQUANTIZATION_AB2;
244 static const requantization_t p_requantization_ab3[16] = ADEC_LAYER2_REQUANTIZATION_AB3;
245 static const requantization_t p_requantization_ab4[16] = ADEC_LAYER2_REQUANTIZATION_AB4;
246 static const requantization_t * pp_requantization_ab[30] = ADEC_LAYER2_REQUANTIZATION_AB;
248 static int i_sblimit, i_bitrate_per_channel_index;
249 static int pi_scfsi_0[30], pi_scfsi_1[30];
250 static const byte_t * pi_nbal;
251 static float ppf_sample_0[3][32], ppf_sample_1[3][32];
252 static const requantization_t * pp_requantization_0[30];
253 static const requantization_t * pp_requantization_1[30];
254 static requantization_t requantization;
255 static const float * pf_ungroup;
257 static float pf_scalefactor_0_0[30], pf_scalefactor_0_1[30], pf_scalefactor_0_2[30];
258 static float pf_scalefactor_1_0[30], pf_scalefactor_1_1[30], pf_scalefactor_1_2[30];
266 int i_need = 0, i_dump = 0;
267 // static const int pi_framesize[512] = ADEC_FRAME_SIZE;
269 /* Read the audio frame header and flush the bit buffer */
270 i_header = p_adec->bit_stream.fifo.buffer;
271 p_adec->bit_stream.fifo.buffer = 0;
272 p_adec->bit_stream.fifo.i_available = 0;
273 /* Read the sampling frequency (see ISO/IEC 11172-3 2.4.2.3) */
274 i_sampling_frequency = (int)((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK)
275 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT);
276 /* Read the mode (see ISO/IEC 11172-3 2.4.2.3) */
277 i_mode = (int)((i_header & ADEC_HEADER_MODE_MASK) >> ADEC_HEADER_MODE_SHIFT);
278 /* If a CRC can be found in the frame, get rid of it */
279 if ( (i_header & ADEC_HEADER_PROTECTION_BIT_MASK) == 0 )
281 GetByte( &p_adec->bit_stream );
282 GetByte( &p_adec->bit_stream );
285 /* Find out the bitrate per channel index */
286 i_bitrate_per_channel_index = (int)ppi_bitrate_per_channel_index[i_mode]
287 [(i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT];
288 /* Find out the number of subbands */
289 i_sblimit = (int)ppi_sblimit[i_sampling_frequency][i_bitrate_per_channel_index];
290 /* Check if the frame is valid or not */
291 if ( i_sblimit == 0 )
293 return( 0 ); /* the frame is invalid */
295 /* Find out the number of bits allocated */
296 pi_nbal = ppi_nbal[ (i_bitrate_per_channel_index <= 2) ? 0 : 1 ];
298 /* Find out the `bound' subband (see ISO/IEC 11172-3 2.4.2.3) */
301 i_bound = (int)(((i_header & ADEC_HEADER_MODE_EXTENSION_MASK) >> (ADEC_HEADER_MODE_EXTENSION_SHIFT - 2)) + 4);
302 if ( i_bound > i_sblimit )
312 /* Read the allocation information (see ISO/IEC 11172-3 2.4.1.6) */
313 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
315 i_2nbal = 2 * (i_nbal = (int)pi_nbal[ i_sb ]);
316 NeedBits( &p_adec->bit_stream, i_2nbal );
318 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
319 p_adec->bit_stream.fifo.buffer <<= i_nbal;
320 pi_allocation_1[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
321 p_adec->bit_stream.fifo.buffer <<= i_nbal;
322 p_adec->bit_stream.fifo.i_available -= i_2nbal;
325 for ( ; i_sb < i_sblimit; i_sb++ )
327 i_nbal = (int)pi_nbal[ i_sb ];
328 NeedBits( &p_adec->bit_stream, i_nbal );
330 pi_allocation_0[ i_sb ] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - i_nbal));
331 DumpBits( &p_adec->bit_stream, i_nbal );
335 #define MACRO( p_requantization ) \
336 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
338 if ( pi_allocation_0[i_sb] ) \
340 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
341 NeedBits( &p_adec->bit_stream, 2 ); \
343 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
344 DumpBits( &p_adec->bit_stream, 2 ); \
349 ppf_sample_0[0][i_sb] = .0; \
350 ppf_sample_0[1][i_sb] = .0; \
351 ppf_sample_0[2][i_sb] = .0; \
354 if ( pi_allocation_1[i_sb] ) \
356 pp_requantization_1[i_sb] = &((p_requantization)[pi_allocation_1[i_sb]]); \
357 NeedBits( &p_adec->bit_stream, 2 ); \
359 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
360 DumpBits( &p_adec->bit_stream, 2 ); \
365 ppf_sample_1[0][i_sb] = .0; \
366 ppf_sample_1[1][i_sb] = .0; \
367 ppf_sample_1[2][i_sb] = .0; \
371 for ( ; i_sb < i_sblimit; i_sb++ ) \
373 if ( pi_allocation_0[i_sb] ) \
375 pp_requantization_0[i_sb] = &((p_requantization)[pi_allocation_0[i_sb]]); \
376 NeedBits( &p_adec->bit_stream, 4 ); \
378 pi_scfsi_0[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
379 p_adec->bit_stream.fifo.buffer <<= 2; \
380 pi_scfsi_1[i_sb] = (int)(p_adec->bit_stream.fifo.buffer >> (32 - 2)); \
381 p_adec->bit_stream.fifo.buffer <<= 2; \
382 p_adec->bit_stream.fifo.i_available -= 4; \
387 ppf_sample_0[0][i_sb] = .0; \
388 ppf_sample_0[1][i_sb] = .0; \
389 ppf_sample_0[2][i_sb] = .0; \
390 ppf_sample_1[0][i_sb] = .0; \
391 ppf_sample_1[1][i_sb] = .0; \
392 ppf_sample_1[2][i_sb] = .0; \
397 if ( i_bitrate_per_channel_index <= 2 )
399 MACRO( p_requantization_cd )
403 MACRO( pp_requantization_ab[i_sb] )
406 #define SWITCH( pi_scfsi, pf_scalefactor_0, pf_scalefactor_1, pf_scalefactor_2 ) \
407 switch ( (pi_scfsi)[i_sb] ) \
410 NeedBits( &p_adec->bit_stream, (3*6) ); \
412 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
413 p_adec->bit_stream.fifo.buffer <<= 6; \
414 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
415 p_adec->bit_stream.fifo.buffer <<= 6; \
416 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
417 p_adec->bit_stream.fifo.buffer <<= 6; \
418 p_adec->bit_stream.fifo.i_available -= (3*6); \
423 NeedBits( &p_adec->bit_stream, (2*6) ); \
425 (pf_scalefactor_0)[i_sb] = \
426 (pf_scalefactor_1)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
427 p_adec->bit_stream.fifo.buffer <<= 6; \
428 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
429 p_adec->bit_stream.fifo.buffer <<= 6; \
430 p_adec->bit_stream.fifo.i_available -= (2*6); \
435 NeedBits( &p_adec->bit_stream, (1*6) ); \
437 (pf_scalefactor_0)[i_sb] = \
438 (pf_scalefactor_1)[i_sb] = \
439 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
440 DumpBits( &p_adec->bit_stream, (1*6) ); \
445 NeedBits( &p_adec->bit_stream, (2*6) ); \
447 (pf_scalefactor_0)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
448 p_adec->bit_stream.fifo.buffer <<= 6; \
449 (pf_scalefactor_1)[i_sb] = \
450 (pf_scalefactor_2)[i_sb] = pf_scalefactor[p_adec->bit_stream.fifo.buffer >> (32 - 6)]; \
451 p_adec->bit_stream.fifo.buffer <<= 6; \
452 p_adec->bit_stream.fifo.i_available -= (2*6); \
458 for ( i_sb = 0; i_sb < i_bound; i_sb++ )
460 if ( pi_allocation_0[i_sb] )
462 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
464 if ( pi_allocation_1[i_sb] )
466 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
469 for ( ; i_sb < i_sblimit; i_sb++ )
471 if ( pi_allocation_0[i_sb] )
473 SWITCH( pi_scfsi_0, pf_scalefactor_0_0, pf_scalefactor_0_1, pf_scalefactor_0_2 )
474 SWITCH( pi_scfsi_1, pf_scalefactor_1_0, pf_scalefactor_1_1, pf_scalefactor_1_2 )
477 for ( ; i_sb < 32; i_sb++ )
479 ppf_sample_0[0][i_sb] = .0;
480 ppf_sample_0[1][i_sb] = .0;
481 ppf_sample_0[2][i_sb] = .0;
482 ppf_sample_1[0][i_sb] = .0;
483 ppf_sample_1[1][i_sb] = .0;
484 ppf_sample_1[2][i_sb] = .0;
488 /* fprintf(stderr, "%p\n", p_adec->p_aout_fifo->buffer); */ \
489 /* fprintf(stderr, "l_end_frame == %li, %p\n", l_end_frame, (aout_frame_t *)p_adec->p_aout_fifo->buffer + l_end_frame); */ \
490 p_s16 = ((aout_frame_t *)p_adec->p_aout_fifo->buffer)[ l_end_frame ]; \
491 /* fprintf(stderr, "p_s16 == %p\n", p_s16); */ \
493 l_end_frame &= AOUT_FIFO_SIZE;
494 /* #define NEXT_BUF */
496 #define GROUPTEST( pp_requantization, ppf_sample, pf_sf ) \
497 requantization = *((pp_requantization)[i_sb]); \
498 if ( requantization.pf_ungroup == NULL ) \
500 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
501 i_need += requantization.i_bits_per_codeword; \
502 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * (requantization.f_slope * \
503 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
504 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
505 i_dump += requantization.i_bits_per_codeword; \
507 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
508 i_need += requantization.i_bits_per_codeword; \
509 (ppf_sample)[1][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
510 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
511 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
512 i_dump += requantization.i_bits_per_codeword; \
514 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
515 i_need += requantization.i_bits_per_codeword; \
516 (ppf_sample)[2][i_sb] = f_scalefactor_0 * (requantization.f_slope * \
517 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)) + requantization.f_offset); \
518 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
519 i_dump += requantization.i_bits_per_codeword; \
523 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
524 i_need += requantization.i_bits_per_codeword; \
525 pf_ungroup = requantization.pf_ungroup + 3 * \
526 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
527 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
528 i_dump += requantization.i_bits_per_codeword; \
529 (ppf_sample)[0][i_sb] = (f_scalefactor_0 = (pf_sf)[i_sb]) * pf_ungroup[0]; \
530 (ppf_sample)[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
531 (ppf_sample)[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
533 /* #define GROUPTEST */
535 #define READ_SAMPLE_L2S( pf_scalefactor_0, pf_scalefactor_1, i_grlimit ) \
536 for ( ; i_gr < (i_grlimit); i_gr++ ) \
538 for ( i_sb = 0; i_sb < i_bound; i_sb++ ) \
540 if ( pi_allocation_0[i_sb] ) \
542 GROUPTEST( pp_requantization_0, ppf_sample_0, (pf_scalefactor_0) ) \
544 if ( pi_allocation_1[i_sb] ) \
546 GROUPTEST( pp_requantization_1, ppf_sample_1, (pf_scalefactor_1) ) \
549 for ( ; i_sb < i_sblimit; i_sb++ ) \
551 if ( pi_allocation_0[i_sb] ) \
553 requantization = *(pp_requantization_0[i_sb]); \
554 if ( requantization.pf_ungroup == NULL ) \
556 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
557 i_need += requantization.i_bits_per_codeword; \
558 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * \
559 (requantization.f_slope * (f_dummy = \
560 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
561 requantization.f_offset); \
562 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
563 i_dump += requantization.i_bits_per_codeword; \
564 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * \
565 (requantization.f_slope * f_dummy + requantization.f_offset); \
567 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
568 i_need += requantization.i_bits_per_codeword; \
569 ppf_sample_0[1][i_sb] = f_scalefactor_0 * \
570 (requantization.f_slope * (f_dummy = \
571 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
572 requantization.f_offset); \
573 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
574 i_dump += requantization.i_bits_per_codeword; \
575 ppf_sample_1[1][i_sb] = f_scalefactor_1 * \
576 (requantization.f_slope * f_dummy + requantization.f_offset); \
578 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
579 i_need += requantization.i_bits_per_codeword; \
580 ppf_sample_0[2][i_sb] = f_scalefactor_0 * \
581 (requantization.f_slope * (f_dummy = \
582 (float)(p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword))) + \
583 requantization.f_offset); \
584 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
585 i_dump += requantization.i_bits_per_codeword; \
586 ppf_sample_1[2][i_sb] = f_scalefactor_1 * \
587 (requantization.f_slope * f_dummy + requantization.f_offset); \
591 NeedBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
592 i_need += requantization.i_bits_per_codeword; \
593 pf_ungroup = requantization.pf_ungroup + 3 * \
594 (p_adec->bit_stream.fifo.buffer >> (32 - requantization.i_bits_per_codeword)); \
595 DumpBits( &p_adec->bit_stream, requantization.i_bits_per_codeword ); \
596 i_dump += requantization.i_bits_per_codeword; \
598 ppf_sample_0[0][i_sb] = (f_scalefactor_0 = (pf_scalefactor_0)[i_sb]) * pf_ungroup[0]; \
599 ppf_sample_0[1][i_sb] = f_scalefactor_0 * pf_ungroup[1]; \
600 ppf_sample_0[2][i_sb] = f_scalefactor_0 * pf_ungroup[2]; \
602 ppf_sample_1[0][i_sb] = (f_scalefactor_1 = (pf_scalefactor_1)[i_sb]) * pf_ungroup[0]; \
603 ppf_sample_1[1][i_sb] = f_scalefactor_1 * pf_ungroup[1]; \
604 ppf_sample_1[2][i_sb] = f_scalefactor_1 * pf_ungroup[2]; \
609 /* fprintf(stderr, "%p", p_s16); */ \
610 DCT32( ppf_sample_0[0], &p_adec->bank_0 ); \
611 PCM( &p_adec->bank_0, &p_s16, 2 ); \
612 /* fprintf(stderr, " %p", p_s16); */ \
614 /* fprintf(stderr, " %p\n", p_s16); */ \
616 /* fprintf(stderr, "%p", p_s16); */ \
617 DCT32( ppf_sample_1[0], &p_adec->bank_1 ); \
618 PCM( &p_adec->bank_1, &p_s16, 2 ); \
619 /* fprintf(stderr, " %p", p_s16); */ \
621 /* fprintf(stderr, " %p\n", p_s16); */ \
623 /* fprintf(stderr, "%p", p_s16); */ \
624 DCT32( ppf_sample_0[1], &p_adec->bank_0 ); \
625 PCM( &p_adec->bank_0, &p_s16, 2 ); \
626 /* fprintf(stderr, " %p", p_s16); */ \
628 /* fprintf(stderr, " %p\n", p_s16); */ \
630 /* fprintf(stderr, "%p", p_s16); */ \
631 DCT32( ppf_sample_1[1], &p_adec->bank_1 ); \
632 PCM( &p_adec->bank_1, &p_s16, 2 ); \
633 /* fprintf(stderr, " %p", p_s16); */ \
635 /* fprintf(stderr, " %p\n", p_s16); */ \
637 /* fprintf(stderr, "%p", p_s16); */ \
638 DCT32( ppf_sample_0[2], &p_adec->bank_0 ); \
639 PCM( &p_adec->bank_0, &p_s16, 2 ); \
640 /* fprintf(stderr, " %p", p_s16); */ \
642 /* fprintf(stderr, " %p\n", p_s16); */ \
644 /* fprintf(stderr, "%p", p_s16); */ \
645 DCT32( ppf_sample_1[2], &p_adec->bank_1 ); \
646 PCM( &p_adec->bank_1, &p_s16, 2 ); \
647 /* fprintf(stderr, " %p", p_s16); */ \
649 /* fprintf(stderr, " %p\n", p_s16); */ \
651 /* #define READ_SAMPLE_L2S */
653 l_end_frame = p_adec->p_aout_fifo->l_end_frame;
657 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 2 )
660 READ_SAMPLE_L2S( pf_scalefactor_0_0, pf_scalefactor_1_0, 4 )
663 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 6 )
666 READ_SAMPLE_L2S( pf_scalefactor_0_1, pf_scalefactor_1_1, 8 )
669 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 10 )
672 READ_SAMPLE_L2S( pf_scalefactor_0_2, pf_scalefactor_1_2, 12 )
674 // fprintf(stderr, "adec debug: layer == %i, padding_bit == %i, sampling_frequency == %i, bitrate_index == %i\n",
675 // (i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT,
676 // (i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT,
677 // (i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT,
678 // (i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT);
679 // fprintf(stderr, "adec debug: framesize == %i, i_need == %i, i_dump == %i\n",
680 // pi_framesize[ 128 * ((i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT) +
681 // 64 * ((i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT) +
682 // 16 * ((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT) +
683 // 1 * ((i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT) ],
686 p_adec->bit_stream.fifo.buffer = 0;
687 p_adec->bit_stream.fifo.i_available = 0;
691 /******************************************************************************
692 * InitThread : initialize an audio decoder thread
693 ******************************************************************************
694 * This function is called from RunThread and performs the second step of the
695 * initialization. It returns 0 on success.
696 ******************************************************************************/
697 static int InitThread( adec_thread_t * p_adec )
699 aout_fifo_t aout_fifo;
701 intf_DbgMsg("adec debug: initializing audio decoder thread %p\n", p_adec);
703 /* Our first job is to initialize the bit stream structure with the
704 * beginning of the input stream */
705 vlc_mutex_lock( &p_adec->fifo.data_lock );
706 while ( DECODER_FIFO_ISEMPTY(p_adec->fifo) )
708 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
710 p_adec->bit_stream.p_ts = DECODER_FIFO_START( p_adec->fifo )->p_first_ts;
711 p_adec->bit_stream.i_byte = p_adec->bit_stream.p_ts->i_payload_start;
712 vlc_mutex_unlock( &p_adec->fifo.data_lock );
714 /* Now we look for an audio frame header in the input stream */
715 if ( FindHeader(p_adec) )
717 return( -1 ); /* b_die or b_error is set */
721 * We have the header and all its informations : we must be able to create
722 * the audio output fifo.
725 /* Is the sound in mono mode or stereo mode ? */
726 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
728 intf_DbgMsg("adec debug: mode == mono\n");
729 aout_fifo.i_type = AOUT_ADEC_MONO_FIFO;
730 aout_fifo.b_stereo = 0;
734 intf_DbgMsg("adec debug: mode == stereo\n");
735 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
736 aout_fifo.b_stereo = 1;
739 /* Checking the sampling frequency */
740 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) \
741 >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT )
744 intf_DbgMsg("adec debug: sampling_frequency == 44100 Hz\n");
745 aout_fifo.l_rate = 44100;
749 intf_DbgMsg("adec debug: sampling_frequency == 48000 Hz\n");
750 aout_fifo.l_rate = 48000;
754 intf_DbgMsg("adec debug: sampling_frequency == 32000 Hz\n");
755 aout_fifo.l_rate = 32000;
759 intf_ErrMsg("adec error: can't create audio output fifo (sampling_frequency == `reserved')\n");
763 /* Creating the audio output fifo */
764 if ( (p_adec->p_aout_fifo = aout_CreateFifo(p_adec->p_aout, &aout_fifo)) == NULL )
769 intf_DbgMsg("adec debug: audio decoder thread %p initialized\n", p_adec);
773 /******************************************************************************
774 * RunThread : audio decoder thread
775 ******************************************************************************
776 * Audio decoder thread. This function does only returns when the thread is
778 ******************************************************************************/
779 static void RunThread( adec_thread_t * p_adec )
781 // static const int pi_framesize[512] = ADEC_FRAME_SIZE;
786 intf_DbgMsg("adec debug: running audio decoder thread (%p) (pid == %i)\n", p_adec, getpid());
788 /* Initializing the audio decoder thread */
789 if ( InitThread(p_adec) )
794 /* Audio decoder thread's main loop */
795 while ( (!p_adec->b_die) && (!p_adec->b_error) )
797 switch ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT )
801 intf_DbgMsg("adec debug: layer == 0 (reserved)\n");
802 p_adec->bit_stream.fifo.buffer = 0;
803 p_adec->bit_stream.fifo.i_available = 0;
808 p_adec->bit_stream.fifo.buffer = 0;
809 p_adec->bit_stream.fifo.i_available = 0;
814 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
816 adec_Layer2_Mono( p_adec );
820 // i_header = p_adec->bit_stream.fifo.buffer;
821 // i_framesize = pi_framesize[ 128*((i_header & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT) +
822 // 64*((i_header & ADEC_HEADER_PADDING_BIT_MASK) >> ADEC_HEADER_PADDING_BIT_SHIFT) +
823 // 16*((i_header & ADEC_HEADER_SAMPLING_FREQUENCY_MASK) >> ADEC_HEADER_SAMPLING_FREQUENCY_SHIFT) +
824 // 1*((i_header & ADEC_HEADER_BITRATE_INDEX_MASK) >> ADEC_HEADER_BITRATE_INDEX_SHIFT) ];
825 // for ( i_dummy = 0; i_dummy < i_framesize; i_dummy++ )
827 // GetByte( &p_adec->bit_stream );
829 // for ( i_dummy = 0; i_dummy < 512; i_dummy++ )
831 // p_adec->bank_0.v1[ i_dummy ] = .0;
832 // p_adec->bank_1.v1[ i_dummy ] = .0;
833 // p_adec->bank_0.v2[ i_dummy ] = .0;
834 // p_adec->bank_1.v2[ i_dummy ] = .0;
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 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
851 /* Decoding the frames */
852 if ( adec_Layer2_Stereo(p_adec) )
854 vlc_mutex_lock( &p_adec->p_aout_fifo->data_lock );
856 if ( DECODER_FIFO_START(p_adec->fifo)->b_has_pts )
858 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(p_adec->fifo)->i_pts;
859 DECODER_FIFO_START(p_adec->fifo)->b_has_pts = 0;
863 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
865 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
867 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
868 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
870 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
871 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;
876 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
877 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
879 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE;
880 p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
881 vlc_mutex_unlock( &p_adec->p_aout_fifo->data_lock );
888 if ( (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_MODE_MASK) == ADEC_HEADER_MODE_MASK )
890 adec_Layer1_Mono( p_adec );
894 adec_Layer1_Stereo( p_adec );
899 intf_DbgMsg("adec debug: layer == %i (unknown)\n",
900 (p_adec->bit_stream.fifo.buffer & ADEC_HEADER_LAYER_MASK) >> ADEC_HEADER_LAYER_SHIFT);
901 p_adec->bit_stream.fifo.buffer = 0;
902 p_adec->bit_stream.fifo.i_available = 0;
905 FindHeader( p_adec );
908 /* If b_error is set, the audio decoder thread enters the error loop */
909 if ( p_adec->b_error )
911 ErrorThread( p_adec );
914 /* End of the audio decoder thread */
918 /******************************************************************************
919 * ErrorThread : audio decoder's RunThread() error loop
920 ******************************************************************************
921 * This function is called when an error occured during thread main's loop. The
922 * thread can still receive feed, but must be ready to terminate as soon as
924 ******************************************************************************/
925 static void ErrorThread( adec_thread_t *p_adec )
927 /* We take the lock, because we are going to read/write the start/end
928 * indexes of the decoder fifo */
929 vlc_mutex_lock( &p_adec->fifo.data_lock );
931 /* Wait until a `die' order is sent */
932 while( !p_adec->b_die )
934 /* Trash all received PES packets */
935 while( !DECODER_FIFO_ISEMPTY(p_adec->fifo) )
937 input_NetlistFreePES( p_adec->bit_stream.p_input, DECODER_FIFO_START(p_adec->fifo) );
938 DECODER_FIFO_INCSTART( p_adec->fifo );
941 /* Waiting for the input thread to put new PES packets in the fifo */
942 vlc_cond_wait( &p_adec->fifo.data_wait, &p_adec->fifo.data_lock );
945 /* We can release the lock before leaving */
946 vlc_mutex_unlock( &p_adec->fifo.data_lock );
949 /******************************************************************************
950 * EndThread : audio decoder thread destruction
951 ******************************************************************************
952 * This function is called when the thread ends after a sucessfull
954 ******************************************************************************/
955 static void EndThread( adec_thread_t *p_adec )
957 intf_DbgMsg("adec debug: destroying audio decoder thread %p\n", p_adec);
959 /* If the audio output fifo was created, we destroy it */
960 if ( p_adec->p_aout_fifo != NULL )
962 aout_DestroyFifo( p_adec->p_aout_fifo );
964 /* Destroy descriptor */
967 intf_DbgMsg("adec debug: audio decoder thread %p destroyed\n", p_adec);