1 /*****************************************************************************
2 * flac.c: flac decoder/encoder module making use of libflac
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VLC authors and VideoLAN
7 * Authors: Gildas Bazin <gbazin@videolan.org>
8 * Sigmund Augdal Helberg <dnumgis@videolan.org>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
29 /* workaround libflac overriding assert.h system header */
30 #define assert(x) do {} while(0)
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
38 #include <vlc_codec.h>
40 #include <FLAC/stream_decoder.h>
41 #include <FLAC/stream_encoder.h>
43 #include <vlc_block_helper.h>
46 #if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT >= 8
47 # define USE_NEW_FLAC_API
50 /*****************************************************************************
51 * decoder_sys_t : FLAC decoder descriptor
52 *****************************************************************************/
56 * Input/Output properties
59 block_t *p_aout_buffer;
65 FLAC__StreamDecoder *p_flac;
66 FLAC__StreamMetadata_StreamInfo stream_info;
70 static const int pi_channels_maps[9] =
74 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
75 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
76 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
77 | AOUT_CHAN_REARRIGHT,
78 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
79 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
80 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
81 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
82 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
83 | AOUT_CHAN_REARCENTER | AOUT_CHAN_MIDDLELEFT| AOUT_CHAN_MIDDLERIGHT
85 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
86 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
90 /*****************************************************************************
92 *****************************************************************************/
93 static int OpenDecoder ( vlc_object_t * );
94 static void CloseDecoder ( vlc_object_t * );
97 static int OpenEncoder ( vlc_object_t * );
98 static void CloseEncoder ( vlc_object_t * );
101 static block_t *DecodeBlock( decoder_t *, block_t ** );
103 /*****************************************************************************
105 *****************************************************************************/
108 set_category( CAT_INPUT )
109 set_subcategory( SUBCAT_INPUT_ACODEC )
110 add_shortcut( "flac" )
112 set_description( N_("Flac audio decoder") )
113 set_capability( "decoder", 100 )
114 set_callbacks( OpenDecoder, CloseDecoder )
118 add_shortcut( "flac" )
119 set_description( N_("Flac audio encoder") )
120 set_capability( "encoder", 100 )
121 set_callbacks( OpenEncoder, CloseEncoder )
126 /*****************************************************************************
127 * Interleave: helper function to interleave channels
128 *****************************************************************************/
129 static void Interleave( int32_t *p_out, const int32_t * const *pp_in,
130 const unsigned char *restrict pi_index, unsigned i_nb_channels,
131 unsigned i_samples, unsigned bits )
133 unsigned shift = 32 - bits;
135 for( unsigned j = 0; j < i_samples; j++ )
136 for( unsigned i = 0; i < i_nb_channels; i++ )
137 p_out[j * i_nb_channels + i] = pp_in[pi_index[i]][j] << shift;
140 /*****************************************************************************
141 * DecoderWriteCallback: called by libflac to output decoded samples
142 *****************************************************************************/
143 static FLAC__StreamDecoderWriteStatus
144 DecoderWriteCallback( const FLAC__StreamDecoder *decoder,
145 const FLAC__Frame *frame,
146 const FLAC__int32 *const buffer[], void *client_data )
148 /* XXX it supposes our internal format is WG4 */
149 static const unsigned char ppi_reorder[1+8][8] = {
156 { 0, 1, 4, 5, 2, 3 },
157 { 0, 1, 5, 6, 4, 2, 3 },
158 { 0, 1, 6, 7, 4, 5, 2, 3 },
162 decoder_t *p_dec = (decoder_t *)client_data;
163 decoder_sys_t *p_sys = p_dec->p_sys;
165 if( p_dec->fmt_out.audio.i_channels <= 0 ||
166 p_dec->fmt_out.audio.i_channels > 8 )
167 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
168 if( date_Get( &p_sys->end_date ) <= VLC_TS_INVALID )
169 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
171 const unsigned char *pi_reorder = ppi_reorder[p_dec->fmt_out.audio.i_channels];
173 p_sys->p_aout_buffer =
174 decoder_NewAudioBuffer( p_dec, frame->header.blocksize );
176 if( p_sys->p_aout_buffer == NULL )
177 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
179 Interleave( (int32_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
180 frame->header.channels, frame->header.blocksize,
181 frame->header.bits_per_sample );
183 /* Date management (already done by packetizer) */
184 p_sys->p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
185 p_sys->p_aout_buffer->i_length =
186 date_Increment( &p_sys->end_date, frame->header.blocksize ) -
187 p_sys->p_aout_buffer->i_pts;
189 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
192 /*****************************************************************************
193 * DecoderReadCallback: called by libflac when it needs more data
194 *****************************************************************************/
195 static FLAC__StreamDecoderReadStatus
196 DecoderReadCallback( const FLAC__StreamDecoder *decoder, FLAC__byte buffer[],
197 size_t *bytes, void *client_data )
200 decoder_t *p_dec = (decoder_t *)client_data;
201 decoder_sys_t *p_sys = p_dec->p_sys;
203 if( p_sys->p_block && p_sys->p_block->i_buffer )
205 *bytes = __MIN(*bytes, p_sys->p_block->i_buffer);
206 memcpy( buffer, p_sys->p_block->p_buffer, *bytes );
207 p_sys->p_block->i_buffer -= *bytes;
208 p_sys->p_block->p_buffer += *bytes;
213 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
216 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
219 /*****************************************************************************
220 * DecoderMetadataCallback: called by libflac to when it encounters metadata
221 *****************************************************************************/
222 static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder,
223 const FLAC__StreamMetadata *metadata,
227 decoder_t *p_dec = (decoder_t *)client_data;
228 decoder_sys_t *p_sys = p_dec->p_sys;
230 /* Setup the format */
231 p_dec->fmt_out.audio.i_rate = metadata->data.stream_info.sample_rate;
232 p_dec->fmt_out.audio.i_channels = metadata->data.stream_info.channels;
233 p_dec->fmt_out.audio.i_physical_channels =
234 p_dec->fmt_out.audio.i_original_channels =
235 pi_channels_maps[metadata->data.stream_info.channels];
236 p_dec->fmt_out.audio.i_bitspersample =
237 metadata->data.stream_info.bits_per_sample;
239 msg_Dbg( p_dec, "channels:%d samplerate:%d bitspersamples:%d",
240 p_dec->fmt_out.audio.i_channels, p_dec->fmt_out.audio.i_rate,
241 p_dec->fmt_out.audio.i_bitspersample );
243 p_sys->b_stream_info = true;
244 p_sys->stream_info = metadata->data.stream_info;
246 date_Init( &p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1 );
247 date_Set( &p_sys->end_date, VLC_TS_INVALID );
250 /*****************************************************************************
251 * DecoderErrorCallback: called when the libflac decoder encounters an error
252 *****************************************************************************/
253 static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder,
254 FLAC__StreamDecoderErrorStatus status,
258 decoder_t *p_dec = (decoder_t *)client_data;
262 case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC:
263 msg_Warn( p_dec, "an error in the stream caused the decoder to "
264 "lose synchronization." );
266 case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER:
267 msg_Err( p_dec, "the decoder encountered a corrupted frame header." );
269 case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH:
270 msg_Err( p_dec, "frame's data did not match the CRC in the "
274 msg_Err( p_dec, "got decoder error: %d", status );
277 FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
280 /*****************************************************************************
281 * OpenDecoder: probe the decoder and return score
282 *****************************************************************************/
283 static int OpenDecoder( vlc_object_t *p_this )
285 decoder_t *p_dec = (decoder_t*)p_this;
286 decoder_sys_t *p_sys;
288 if( p_dec->fmt_in.i_codec != VLC_CODEC_FLAC )
293 /* Allocate the memory needed to store the decoder's structure */
294 if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
298 p_sys->b_stream_info = false;
299 p_sys->p_block = NULL;
301 /* Take care of flac init */
302 if( !(p_sys->p_flac = FLAC__stream_decoder_new()) )
304 msg_Err( p_dec, "FLAC__stream_decoder_new() failed" );
309 #ifdef USE_NEW_FLAC_API
310 if( FLAC__stream_decoder_init_stream( p_sys->p_flac,
316 DecoderWriteCallback,
317 DecoderMetadataCallback,
318 DecoderErrorCallback,
320 != FLAC__STREAM_DECODER_INIT_STATUS_OK )
322 msg_Err( p_dec, "FLAC__stream_decoder_init_stream() failed" );
323 FLAC__stream_decoder_delete( p_sys->p_flac );
328 FLAC__stream_decoder_set_read_callback( p_sys->p_flac,
329 DecoderReadCallback );
330 FLAC__stream_decoder_set_write_callback( p_sys->p_flac,
331 DecoderWriteCallback );
332 FLAC__stream_decoder_set_metadata_callback( p_sys->p_flac,
333 DecoderMetadataCallback );
334 FLAC__stream_decoder_set_error_callback( p_sys->p_flac,
335 DecoderErrorCallback );
336 FLAC__stream_decoder_set_client_data( p_sys->p_flac, p_dec );
338 FLAC__stream_decoder_init( p_sys->p_flac );
341 /* Set output properties */
342 p_dec->fmt_out.i_cat = AUDIO_ES;
343 p_dec->fmt_out.i_codec = VLC_CODEC_S32N;
346 p_dec->pf_decode_audio = DecodeBlock;
349 p_dec->b_need_packetized = true;
354 /*****************************************************************************
355 * CloseDecoder: flac decoder destruction
356 *****************************************************************************/
357 static void CloseDecoder( vlc_object_t *p_this )
359 decoder_t *p_dec = (decoder_t *)p_this;
360 decoder_sys_t *p_sys = p_dec->p_sys;
362 FLAC__stream_decoder_finish( p_sys->p_flac );
363 FLAC__stream_decoder_delete( p_sys->p_flac );
366 block_Release( p_sys->p_block );
370 /*****************************************************************************
371 * ProcessHeader: process Flac header.
372 *****************************************************************************/
373 static void ProcessHeader( decoder_t *p_dec )
375 decoder_sys_t *p_sys = p_dec->p_sys;
377 if( !p_dec->fmt_in.i_extra )
380 /* Decode STREAMINFO */
381 msg_Dbg( p_dec, "decode STREAMINFO" );
382 p_sys->p_block = block_Alloc( p_dec->fmt_in.i_extra );
383 memcpy( p_sys->p_block->p_buffer, p_dec->fmt_in.p_extra,
384 p_dec->fmt_in.i_extra );
385 FLAC__stream_decoder_process_until_end_of_metadata( p_sys->p_flac );
386 msg_Dbg( p_dec, "STREAMINFO decoded" );
389 /*****************************************************************************
390 * decoder_state_error: print meaningful error messages
391 *****************************************************************************/
392 static void decoder_state_error( decoder_t *p_dec,
393 FLAC__StreamDecoderState state )
397 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
398 msg_Dbg( p_dec, "the decoder is ready to search for metadata." );
400 case FLAC__STREAM_DECODER_READ_METADATA:
401 msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
402 "reading metadata." );
404 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
405 msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
406 "searching for the frame sync code." );
408 case FLAC__STREAM_DECODER_READ_FRAME:
409 msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
410 "reading a frame." );
412 case FLAC__STREAM_DECODER_END_OF_STREAM:
413 msg_Dbg( p_dec, "the decoder has reached the end of the stream." );
415 #ifdef USE_NEW_FLAC_API
416 case FLAC__STREAM_DECODER_OGG_ERROR:
417 msg_Err( p_dec, "error occurred in the Ogg layer." );
419 case FLAC__STREAM_DECODER_SEEK_ERROR:
420 msg_Err( p_dec, "error occurred while seeking." );
423 case FLAC__STREAM_DECODER_ABORTED:
424 msg_Warn( p_dec, "the decoder was aborted by the read callback." );
426 #ifndef USE_NEW_FLAC_API
427 case FLAC__STREAM_DECODER_UNPARSEABLE_STREAM:
428 msg_Warn( p_dec, "the decoder encountered reserved fields in use "
432 case FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
433 msg_Err( p_dec, "error when allocating memory." );
435 #ifndef USE_NEW_FLAC_API
436 case FLAC__STREAM_DECODER_ALREADY_INITIALIZED:
437 msg_Err( p_dec, "FLAC__stream_decoder_init() was called when the "
438 "decoder was already initialized, usually because "
439 "FLAC__stream_decoder_finish() was not called." );
441 case FLAC__STREAM_DECODER_INVALID_CALLBACK:
442 msg_Err( p_dec, "FLAC__stream_decoder_init() was called without "
443 "all callbacks being set." );
446 case FLAC__STREAM_DECODER_UNINITIALIZED:
447 msg_Err( p_dec, "decoder in uninitialized state." );
450 msg_Warn(p_dec, "unknown error" );
454 /****************************************************************************
455 * DecodeBlock: the whole thing
456 ****************************************************************************/
457 static block_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
459 decoder_sys_t *p_sys = p_dec->p_sys;
461 if( !pp_block || !*pp_block )
463 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
465 block_Release( *pp_block );
469 if( !p_sys->b_stream_info )
470 ProcessHeader( p_dec );
472 p_sys->p_block = *pp_block;
475 if( p_sys->p_block->i_pts > VLC_TS_INVALID &&
476 p_sys->p_block->i_pts != date_Get( &p_sys->end_date ) )
477 date_Set( &p_sys->end_date, p_sys->p_block->i_pts );
479 p_sys->p_aout_buffer = 0;
481 if( !FLAC__stream_decoder_process_single( p_sys->p_flac ) )
483 decoder_state_error( p_dec,
484 FLAC__stream_decoder_get_state( p_sys->p_flac ) );
485 FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
488 /* If the decoder is in the "aborted" state,
489 * FLAC__stream_decoder_process_single() won't return an error. */
490 if( FLAC__stream_decoder_get_state(p_dec->p_sys->p_flac)
491 == FLAC__STREAM_DECODER_ABORTED )
493 FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
496 block_Release( p_sys->p_block );
497 p_sys->p_block = NULL;
499 return p_sys->p_aout_buffer;
504 /*****************************************************************************
505 * encoder_sys_t : flac encoder descriptor
506 *****************************************************************************/
516 FLAC__int32 *p_buffer;
517 unsigned int i_buffer;
524 FLAC__StreamEncoder *p_flac;
525 FLAC__StreamMetadata_StreamInfo stream_info;
533 #define STREAMINFO_SIZE 38
535 static block_t *Encode( encoder_t *, block_t * );
537 /*****************************************************************************
538 * EncoderWriteCallback: called by libflac to output encoded samples
539 *****************************************************************************/
540 static FLAC__StreamEncoderWriteStatus
541 EncoderWriteCallback( const FLAC__StreamEncoder *encoder,
542 const FLAC__byte buffer[],
543 size_t bytes, unsigned samples,
544 unsigned current_frame, void *client_data )
546 VLC_UNUSED(encoder); VLC_UNUSED(current_frame);
547 encoder_t *p_enc = (encoder_t *)client_data;
548 encoder_sys_t *p_sys = p_enc->p_sys;
553 if( p_sys->i_headers == 1 )
555 msg_Dbg( p_enc, "Writing STREAMINFO: %zu", bytes );
557 /* Backup the STREAMINFO metadata block */
558 p_enc->fmt_out.i_extra = STREAMINFO_SIZE + 4;
559 p_enc->fmt_out.p_extra = xmalloc( STREAMINFO_SIZE + 4 );
560 memcpy( p_enc->fmt_out.p_extra, "fLaC", 4 );
561 memcpy( ((uint8_t *)p_enc->fmt_out.p_extra) + 4, buffer,
564 /* Fake this as the last metadata block */
565 ((uint8_t*)p_enc->fmt_out.p_extra)[4] |= 0x80;
568 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
571 p_block = block_Alloc( bytes );
572 memcpy( p_block->p_buffer, buffer, bytes );
574 p_block->i_dts = p_block->i_pts = p_sys->i_pts;
576 p_sys->i_samples_delay -= samples;
578 p_block->i_length = (mtime_t)1000000 *
579 (mtime_t)samples / (mtime_t)p_enc->fmt_in.audio.i_rate;
582 p_sys->i_pts += p_block->i_length;
584 block_ChainAppend( &p_sys->p_chain, p_block );
586 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
588 /*****************************************************************************
589 * EncoderMetadataCallback: called by libflac to output metadata
590 *****************************************************************************/
591 static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder,
592 const FLAC__StreamMetadata *metadata,
596 encoder_t *p_enc = (encoder_t *)client_data;
598 msg_Err( p_enc, "MetadataCallback: %i", metadata->type );
602 /*****************************************************************************
603 * OpenEncoder: probe the encoder and return score
604 *****************************************************************************/
605 static int OpenEncoder( vlc_object_t *p_this )
607 encoder_t *p_enc = (encoder_t *)p_this;
608 encoder_sys_t *p_sys;
610 if( p_enc->fmt_out.i_codec != VLC_CODEC_FLAC &&
616 /* Allocate the memory needed to store the decoder's structure */
617 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
619 p_enc->p_sys = p_sys;
620 p_enc->pf_encode_audio = Encode;
621 p_enc->fmt_out.i_codec = VLC_CODEC_FLAC;
623 p_sys->i_headers = 0;
626 p_sys->i_samples_delay = 0;
628 /* Create flac encoder */
629 if( !(p_sys->p_flac = FLAC__stream_encoder_new()) )
631 msg_Err( p_enc, "FLAC__stream_encoder_new() failed" );
636 FLAC__stream_encoder_set_streamable_subset( p_sys->p_flac, 1 );
637 FLAC__stream_encoder_set_channels( p_sys->p_flac,
638 p_enc->fmt_in.audio.i_channels );
639 FLAC__stream_encoder_set_sample_rate( p_sys->p_flac,
640 p_enc->fmt_in.audio.i_rate );
641 FLAC__stream_encoder_set_bits_per_sample( p_sys->p_flac, 16 );
642 p_enc->fmt_in.i_codec = VLC_CODEC_S16N;
644 /* Get and store the STREAMINFO metadata block as a p_extra */
647 #ifdef USE_NEW_FLAC_API
648 if( FLAC__stream_encoder_init_stream( p_sys->p_flac,
649 EncoderWriteCallback,
652 EncoderMetadataCallback,
654 != FLAC__STREAM_ENCODER_INIT_STATUS_OK )
656 msg_Err( p_enc, "FLAC__stream_encoder_init_stream() failed" );
657 FLAC__stream_encoder_delete( p_sys->p_flac );
662 FLAC__stream_encoder_set_write_callback( p_sys->p_flac,
663 EncoderWriteCallback );
664 FLAC__stream_encoder_set_metadata_callback( p_sys->p_flac,
665 EncoderMetadataCallback );
666 FLAC__stream_encoder_set_client_data( p_sys->p_flac, p_enc );
668 FLAC__stream_encoder_init( p_sys->p_flac );
674 /****************************************************************************
675 * Encode: the whole thing
676 ****************************************************************************
677 * This function spits out ogg packets.
678 ****************************************************************************/
679 static block_t *Encode( encoder_t *p_enc, block_t *p_aout_buf )
681 encoder_sys_t *p_sys = p_enc->p_sys;
685 /* FIXME: p_aout_buf is NULL when it's time to flush*/
686 if( unlikely( !p_aout_buf ) ) return NULL;
688 p_sys->i_pts = p_aout_buf->i_pts -
689 (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay /
690 (mtime_t)p_enc->fmt_in.audio.i_rate;
692 p_sys->i_samples_delay += p_aout_buf->i_nb_samples;
694 /* Convert samples to FLAC__int32 */
695 if( p_sys->i_buffer < p_aout_buf->i_buffer * 2 )
698 xrealloc( p_sys->p_buffer, p_aout_buf->i_buffer * 2 );
699 p_sys->i_buffer = p_aout_buf->i_buffer * 2;
702 for( i = 0 ; i < p_aout_buf->i_buffer / 2 ; i++ )
704 p_sys->p_buffer[i]= ((int16_t *)p_aout_buf->p_buffer)[i];
707 FLAC__stream_encoder_process_interleaved( p_sys->p_flac, p_sys->p_buffer,
708 p_aout_buf->i_nb_samples );
710 p_chain = p_sys->p_chain;
716 /*****************************************************************************
717 * CloseEncoder: encoder destruction
718 *****************************************************************************/
719 static void CloseEncoder( vlc_object_t *p_this )
721 encoder_t *p_enc = (encoder_t *)p_this;
722 encoder_sys_t *p_sys = p_enc->p_sys;
724 FLAC__stream_encoder_delete( p_sys->p_flac );
726 free( p_sys->p_buffer );