1 /*****************************************************************************
2 * speex.c: speex decoder/packetizer/encoder module making use of libspeex.
3 *****************************************************************************
4 * Copyright (C) 2003 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
28 #include <vlc/decoder.h>
29 #include <vlc/input.h>
32 #include <speex/speex.h>
33 #include <speex/speex_header.h>
34 #include <speex/speex_stereo.h>
35 #include <speex/speex_callbacks.h>
37 /*****************************************************************************
38 * decoder_sys_t : speex decoder descriptor
39 *****************************************************************************/
43 vlc_bool_t b_packetizer;
49 int i_frame_in_packet;
55 SpeexHeader *p_header;
56 SpeexStereoState stereo;
62 audio_date_t end_date;
66 static int pi_channels_maps[6] =
69 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
70 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
71 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
72 | AOUT_CHAN_REARRIGHT,
73 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
74 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
77 /****************************************************************************
79 ****************************************************************************/
80 static int OpenDecoder ( vlc_object_t * );
81 static int OpenPacketizer( vlc_object_t * );
82 static void CloseDecoder ( vlc_object_t * );
84 static void *DecodeBlock ( decoder_t *, block_t ** );
85 static int ProcessHeaders( decoder_t * );
86 static int ProcessInitialHeader ( decoder_t *, ogg_packet * );
87 static void *ProcessPacket( decoder_t *, ogg_packet *, block_t ** );
89 static aout_buffer_t *DecodePacket( decoder_t *, ogg_packet * );
90 static block_t *SendPacket( decoder_t *, ogg_packet *, block_t * );
92 static void ParseSpeexComments( decoder_t *, ogg_packet * );
94 static int OpenEncoder ( vlc_object_t * );
95 static void CloseEncoder ( vlc_object_t * );
96 static block_t *Encode ( encoder_t *, aout_buffer_t * );
98 /*****************************************************************************
100 *****************************************************************************/
102 set_category( CAT_INPUT );
103 set_subcategory( SUBCAT_INPUT_ACODEC );
105 set_description( _("Speex audio decoder") );
106 set_capability( "decoder", 100 );
107 set_callbacks( OpenDecoder, CloseDecoder );
110 set_description( _("Speex audio packetizer") );
111 set_capability( "packetizer", 100 );
112 set_callbacks( OpenPacketizer, CloseDecoder );
115 set_description( _("Speex audio encoder") );
116 set_capability( "encoder", 100 );
117 set_callbacks( OpenEncoder, CloseEncoder );
120 /*****************************************************************************
121 * OpenDecoder: probe the decoder and return score
122 *****************************************************************************/
123 static int OpenDecoder( vlc_object_t *p_this )
125 decoder_t *p_dec = (decoder_t*)p_this;
126 decoder_sys_t *p_sys = p_dec->p_sys;
128 if( p_dec->fmt_in.i_codec != VLC_FOURCC('s','p','x',' ') )
133 /* Allocate the memory needed to store the decoder's structure */
134 if( ( p_dec->p_sys = p_sys =
135 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
137 msg_Err( p_dec, "out of memory" );
140 p_dec->p_sys->b_packetizer = VLC_FALSE;
142 aout_DateSet( &p_sys->end_date, 0 );
144 /* Set output properties */
145 p_dec->fmt_out.i_cat = AUDIO_ES;
146 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
149 p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
151 p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
154 p_sys->i_headers = 0;
155 p_sys->p_state = NULL;
156 p_sys->p_header = NULL;
157 p_sys->i_frame_in_packet = 0;
162 static int OpenPacketizer( vlc_object_t *p_this )
164 decoder_t *p_dec = (decoder_t*)p_this;
166 int i_ret = OpenDecoder( p_this );
168 if( i_ret == VLC_SUCCESS )
170 p_dec->p_sys->b_packetizer = VLC_TRUE;
171 p_dec->fmt_out.i_codec = VLC_FOURCC('s','p','x',' ');
177 /****************************************************************************
178 * DecodeBlock: the whole thing
179 ****************************************************************************
180 * This function must be fed with ogg packets.
181 ****************************************************************************/
182 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
184 decoder_sys_t *p_sys = p_dec->p_sys;
185 ogg_packet oggpacket;
187 if( !pp_block ) return NULL;
191 /* Block to Ogg packet */
192 oggpacket.packet = (*pp_block)->p_buffer;
193 oggpacket.bytes = (*pp_block)->i_buffer;
197 if( p_sys->b_packetizer ) return NULL;
199 /* Block to Ogg packet */
200 oggpacket.packet = NULL;
204 oggpacket.granulepos = -1;
207 oggpacket.packetno = 0;
209 /* Check for headers */
210 if( p_sys->i_headers == 0 && p_dec->fmt_in.i_extra )
212 /* Headers already available as extra data */
213 p_sys->i_headers = 2;
215 else if( oggpacket.bytes && p_sys->i_headers < 2 )
217 /* Backup headers as extra data */
220 p_dec->fmt_in.p_extra =
221 realloc( p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra +
222 oggpacket.bytes + 2 );
223 p_extra = ((uint8_t *)p_dec->fmt_in.p_extra) + p_dec->fmt_in.i_extra;
224 *(p_extra++) = oggpacket.bytes >> 8;
225 *(p_extra++) = oggpacket.bytes & 0xFF;
227 memcpy( p_extra, oggpacket.packet, oggpacket.bytes );
228 p_dec->fmt_in.i_extra += oggpacket.bytes + 2;
230 block_Release( *pp_block );
235 if( p_sys->i_headers == 2 )
237 if( ProcessHeaders( p_dec ) != VLC_SUCCESS )
239 p_sys->i_headers = 0;
240 p_dec->fmt_in.i_extra = 0;
241 block_Release( *pp_block );
244 else p_sys->i_headers++;
247 return ProcessPacket( p_dec, &oggpacket, pp_block );
250 /*****************************************************************************
251 * ProcessHeaders: process Speex headers.
252 *****************************************************************************/
253 static int ProcessHeaders( decoder_t *p_dec )
255 decoder_sys_t *p_sys = p_dec->p_sys;
256 ogg_packet oggpacket;
260 if( !p_dec->fmt_in.i_extra ) return VLC_EGENERIC;
262 oggpacket.granulepos = -1;
263 oggpacket.b_o_s = 1; /* yes this actually is a b_o_s packet :) */
265 oggpacket.packetno = 0;
266 p_extra = p_dec->fmt_in.p_extra;
267 i_extra = p_dec->fmt_in.i_extra;
269 /* Take care of the initial Vorbis header */
270 oggpacket.bytes = *(p_extra++) << 8;
271 oggpacket.bytes |= (*(p_extra++) & 0xFF);
272 oggpacket.packet = p_extra;
273 p_extra += oggpacket.bytes;
274 i_extra -= (oggpacket.bytes + 2);
277 msg_Err( p_dec, "header data corrupted");
281 /* Take care of the initial Speex header */
282 if( ProcessInitialHeader( p_dec, &oggpacket ) != VLC_SUCCESS )
284 msg_Err( p_dec, "initial Speex header is corrupted" );
288 /* The next packet in order is the comments header */
290 oggpacket.bytes = *(p_extra++) << 8;
291 oggpacket.bytes |= (*(p_extra++) & 0xFF);
292 oggpacket.packet = p_extra;
293 p_extra += oggpacket.bytes;
294 i_extra -= (oggpacket.bytes + 2);
297 msg_Err( p_dec, "header data corrupted");
301 ParseSpeexComments( p_dec, &oggpacket );
303 if( p_sys->b_packetizer )
305 p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
306 p_dec->fmt_out.p_extra =
307 realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
308 memcpy( p_dec->fmt_out.p_extra,
309 p_dec->fmt_in.p_extra, p_dec->fmt_out.i_extra );
315 /*****************************************************************************
316 * ProcessInitialHeader: processes the inital Speex header packet.
317 *****************************************************************************/
318 static int ProcessInitialHeader( decoder_t *p_dec, ogg_packet *p_oggpacket )
320 decoder_sys_t *p_sys = p_dec->p_sys;
323 SpeexHeader *p_header;
324 const SpeexMode *p_mode;
325 SpeexCallback callback;
327 p_sys->p_header = p_header =
328 speex_packet_to_header( (char *)p_oggpacket->packet,
329 p_oggpacket->bytes );
332 msg_Err( p_dec, "cannot read Speex header" );
335 if( p_header->mode >= SPEEX_NB_MODES )
337 msg_Err( p_dec, "mode number %d does not (yet/any longer) exist in "
338 "this version of libspeex.", p_header->mode );
342 p_mode = speex_mode_list[p_header->mode];
344 if( p_header->speex_version_id > 1 )
346 msg_Err( p_dec, "this file was encoded with Speex bit-stream "
347 "version %d which is not supported by this decoder.",
348 p_header->speex_version_id );
352 if( p_mode->bitstream_version < p_header->mode_bitstream_version )
354 msg_Err( p_dec, "file encoded with a newer version of Speex." );
357 if( p_mode->bitstream_version > p_header->mode_bitstream_version )
359 msg_Err( p_dec, "file encoded with an older version of Speex." );
363 msg_Dbg( p_dec, "Speex %d Hz audio using %s mode %s%s",
364 p_header->rate, p_mode->modeName,
365 ( p_header->nb_channels == 1 ) ? " (mono" : " (stereo",
366 p_header->vbr ? ", VBR)" : ")" );
368 /* Take care of speex decoder init */
369 speex_bits_init( &p_sys->bits );
370 p_sys->p_state = p_state = speex_decoder_init( p_mode );
373 msg_Err( p_dec, "decoder initialization failed" );
377 if( p_header->nb_channels == 2 )
379 SpeexStereoState stereo = SPEEX_STEREO_STATE_INIT;
380 p_sys->stereo = stereo;
381 callback.callback_id = SPEEX_INBAND_STEREO;
382 callback.func = speex_std_stereo_request_handler;
383 callback.data = &p_sys->stereo;
384 speex_decoder_ctl( p_state, SPEEX_SET_HANDLER, &callback );
386 if( p_header->nb_channels <= 0 ||
387 p_header->nb_channels > 5 )
389 msg_Err( p_dec, "invalid number of channels (not between 1 and 5): %i",
390 p_header->nb_channels );
394 /* Setup the format */
395 p_dec->fmt_out.audio.i_physical_channels =
396 p_dec->fmt_out.audio.i_original_channels =
397 pi_channels_maps[p_header->nb_channels];
398 p_dec->fmt_out.audio.i_channels = p_header->nb_channels;
399 p_dec->fmt_out.audio.i_rate = p_header->rate;
401 aout_DateInit( &p_sys->end_date, p_header->rate );
406 /*****************************************************************************
407 * ProcessPacket: processes a Speex packet.
408 *****************************************************************************/
409 static void *ProcessPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
412 decoder_sys_t *p_sys = p_dec->p_sys;
413 block_t *p_block = *pp_block;
415 /* Date management */
416 if( p_block && p_block->i_pts > 0 &&
417 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
419 aout_DateSet( &p_sys->end_date, p_block->i_pts );
422 if( !aout_DateGet( &p_sys->end_date ) )
424 /* We've just started the stream, wait for the first PTS. */
425 if( p_block ) block_Release( p_block );
429 *pp_block = NULL; /* To avoid being fed the same packet again */
431 if( p_sys->b_packetizer )
433 return SendPacket( p_dec, p_oggpacket, p_block );
437 aout_buffer_t *p_aout_buffer;
439 if( p_sys->i_headers >= p_sys->p_header->extra_headers + 2 )
440 p_aout_buffer = DecodePacket( p_dec, p_oggpacket );
442 p_aout_buffer = NULL; /* Skip headers */
444 if( p_block ) block_Release( p_block );
445 return p_aout_buffer;
449 /*****************************************************************************
450 * DecodePacket: decodes a Speex packet.
451 *****************************************************************************/
452 static aout_buffer_t *DecodePacket( decoder_t *p_dec, ogg_packet *p_oggpacket )
454 decoder_sys_t *p_sys = p_dec->p_sys;
456 if( p_oggpacket->bytes )
458 /* Copy Ogg packet to Speex bitstream */
459 speex_bits_read_from( &p_sys->bits, (char *)p_oggpacket->packet,
460 p_oggpacket->bytes );
461 p_sys->i_frame_in_packet = 0;
464 /* Decode one frame at a time */
465 if( p_sys->i_frame_in_packet < p_sys->p_header->frames_per_packet )
467 aout_buffer_t *p_aout_buffer;
471 p_dec->pf_aout_buffer_new( p_dec, p_sys->p_header->frame_size );
477 i_ret = speex_decode_int( p_sys->p_state, &p_sys->bits,
478 (int16_t *)p_aout_buffer->p_buffer );
487 msg_Warn( p_dec, "decoding error: corrupted stream?" );
491 if( speex_bits_remaining( &p_sys->bits ) < 0 )
493 msg_Warn( p_dec, "decoding overflow: corrupted stream?" );
496 if( p_sys->p_header->nb_channels == 2 )
497 speex_decode_stereo_int( (int16_t *)p_aout_buffer->p_buffer,
498 p_sys->p_header->frame_size,
501 /* Date management */
502 p_aout_buffer->start_date = aout_DateGet( &p_sys->end_date );
503 p_aout_buffer->end_date =
504 aout_DateIncrement( &p_sys->end_date, p_sys->p_header->frame_size);
506 p_sys->i_frame_in_packet++;
508 return p_aout_buffer;
516 /*****************************************************************************
517 * SendPacket: send an ogg packet to the stream output.
518 *****************************************************************************/
519 static block_t *SendPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
522 decoder_sys_t *p_sys = p_dec->p_sys;
524 /* Date management */
525 p_block->i_dts = p_block->i_pts = aout_DateGet( &p_sys->end_date );
527 if( p_sys->i_headers >= p_sys->p_header->extra_headers + 2 )
529 aout_DateIncrement( &p_sys->end_date,
530 p_sys->p_header->frame_size ) -
533 p_block->i_length = 0;
538 /*****************************************************************************
539 * ParseSpeexComments: FIXME should be done in demuxer
540 *****************************************************************************/
541 #define readint(buf, base) (((buf[base+3]<<24)&0xff000000)| \
542 ((buf[base+2]<<16)&0xff0000)| \
543 ((buf[base+1]<<8)&0xff00)| \
546 static void ParseSpeexComments( decoder_t *p_dec, ogg_packet *p_oggpacket )
548 input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
549 decoder_sys_t *p_sys = p_dec->p_sys;
551 char *p_buf = (char *)p_oggpacket->packet;
552 const SpeexMode *p_mode;
555 if( p_input->i_object_type != VLC_OBJECT_INPUT ) return;
557 p_mode = speex_mode_list[p_sys->p_header->mode];
559 input_Control( p_input, INPUT_ADD_INFO, _("Speex comment"), _("Mode"),
560 "%s%s", p_mode->modeName,
561 p_sys->p_header->vbr ? " VBR" : "" );
563 if( p_oggpacket->bytes < 8 )
565 msg_Warn( p_dec, "invalid/corrupted comments" );
569 i_len = readint( p_buf, 0 ); p_buf += 4;
570 if( i_len > p_oggpacket->bytes - 4 )
572 msg_Warn( p_dec, "invalid/corrupted comments" );
576 input_Control( p_input, INPUT_ADD_INFO, _("Speex comment"), p_buf, "" );
578 /* TODO: finish comments parsing */
581 /*****************************************************************************
582 * CloseDecoder: speex decoder destruction
583 *****************************************************************************/
584 static void CloseDecoder( vlc_object_t *p_this )
586 decoder_t * p_dec = (decoder_t *)p_this;
587 decoder_sys_t *p_sys = p_dec->p_sys;
591 speex_decoder_destroy( p_sys->p_state );
592 speex_bits_destroy( &p_sys->bits );
595 if( p_sys->p_header ) free( p_sys->p_header );
599 /*****************************************************************************
600 * encoder_sys_t: encoder descriptor
601 *****************************************************************************/
602 #define MAX_FRAME_SIZE 2000
603 #define MAX_FRAME_BYTES 2000
611 char p_buffer_out[MAX_FRAME_BYTES];
618 SpeexStereoState stereo;
621 int i_frames_per_packet;
622 int i_frames_in_packet;
634 /*****************************************************************************
635 * OpenEncoder: probe the encoder and return score
636 *****************************************************************************/
637 static int OpenEncoder( vlc_object_t *p_this )
639 encoder_t *p_enc = (encoder_t *)p_this;
640 encoder_sys_t *p_sys;
641 const SpeexMode *p_speex_mode = &speex_nb_mode;
647 if( p_enc->fmt_out.i_codec != VLC_FOURCC('s','p','x',' ') &&
653 /* Allocate the memory needed to store the decoder's structure */
654 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
656 msg_Err( p_enc, "out of memory" );
659 p_enc->p_sys = p_sys;
660 p_enc->pf_encode_audio = Encode;
661 p_enc->fmt_in.i_codec = AOUT_FMT_S16_NE;
662 p_enc->fmt_out.i_codec = VLC_FOURCC('s','p','x',' ');
664 speex_init_header( &p_sys->header, p_enc->fmt_in.audio.i_rate,
667 p_sys->header.frames_per_packet = 1;
668 p_sys->header.vbr = 1;
669 p_sys->header.nb_channels = p_enc->fmt_in.audio.i_channels;
671 /* Create a new encoder state in narrowband mode */
672 p_sys->p_state = speex_encoder_init( p_speex_mode );
674 /* Set the quality to 8 (15 kbps) */
676 speex_encoder_ctl( p_sys->p_state, SPEEX_SET_QUALITY, &i_quality );
678 /*Initialization of the structure that holds the bits*/
679 speex_bits_init( &p_sys->bits );
681 p_sys->i_frames_in_packet = 0;
682 p_sys->i_samples_delay = 0;
685 speex_encoder_ctl( p_sys->p_state, SPEEX_GET_FRAME_SIZE,
686 &p_sys->i_frame_length );
688 p_sys->i_frame_size = p_sys->i_frame_length *
689 sizeof(int16_t) * p_enc->fmt_in.audio.i_channels;
690 p_sys->p_buffer = malloc( p_sys->i_frame_size );
692 /* Create and store headers */
693 pp_header[0] = speex_header_to_packet( &p_sys->header, &pi_header[0] );
694 pp_header[1] = "ENCODER=VLC media player";
695 pi_header[1] = sizeof("ENCODER=VLC media player");
697 p_enc->fmt_out.i_extra = 3 * 2 + pi_header[0] + pi_header[1];
698 p_extra = p_enc->fmt_out.p_extra = malloc( p_enc->fmt_out.i_extra );
699 for( i = 0; i < 2; i++ )
701 *(p_extra++) = pi_header[i] >> 8;
702 *(p_extra++) = pi_header[i] & 0xFF;
703 memcpy( p_extra, pp_header[i], pi_header[i] );
704 p_extra += pi_header[i];
707 msg_Dbg( p_enc, "encoding: frame size:%d, channels:%d, samplerate:%d",
708 p_sys->i_frame_size, p_enc->fmt_in.audio.i_channels,
709 p_enc->fmt_in.audio.i_rate );
714 /****************************************************************************
715 * Encode: the whole thing
716 ****************************************************************************
717 * This function spits out ogg packets.
718 ****************************************************************************/
719 static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
721 encoder_sys_t *p_sys = p_enc->p_sys;
722 block_t *p_block, *p_chain = NULL;
724 unsigned char *p_buffer = p_aout_buf->p_buffer;
725 int i_samples = p_aout_buf->i_nb_samples;
726 int i_samples_delay = p_sys->i_samples_delay;
728 p_sys->i_pts = p_aout_buf->start_date -
729 (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay /
730 (mtime_t)p_enc->fmt_in.audio.i_rate;
732 p_sys->i_samples_delay += i_samples;
734 while( p_sys->i_samples_delay >= p_sys->i_frame_length )
739 if( i_samples_delay )
741 /* Take care of the left-over from last time */
742 int i_delay_size = i_samples_delay * 2 *
743 p_enc->fmt_in.audio.i_channels;
744 int i_size = p_sys->i_frame_size - i_delay_size;
746 p_samples = (int16_t *)p_sys->p_buffer;
747 memcpy( p_sys->p_buffer + i_delay_size, p_buffer, i_size );
748 p_buffer -= i_delay_size;
749 i_samples += i_samples_delay;
754 p_samples = (int16_t *)p_buffer;
757 /* Encode current frame */
758 if( p_enc->fmt_in.audio.i_channels == 2 )
759 speex_encode_stereo_int( p_samples, p_sys->i_frame_length,
763 if( p_sys->preprocess )
764 speex_preprocess( p_sys->preprocess, p_samples, NULL );
767 speex_encode_int( p_sys->p_state, p_samples, &p_sys->bits );
769 p_buffer += p_sys->i_frame_size;
770 p_sys->i_samples_delay -= p_sys->i_frame_length;
771 i_samples -= p_sys->i_frame_length;
773 p_sys->i_frames_in_packet++;
775 if( p_sys->i_frames_in_packet < p_sys->header.frames_per_packet )
778 p_sys->i_frames_in_packet = 0;
780 speex_bits_insert_terminator( &p_sys->bits );
781 i_out = speex_bits_write( &p_sys->bits, p_sys->p_buffer_out,
783 speex_bits_reset( &p_sys->bits );
785 p_block = block_New( p_enc, i_out );
786 memcpy( p_block->p_buffer, p_sys->p_buffer_out, i_out );
788 p_block->i_length = (mtime_t)1000000 *
789 (mtime_t)p_sys->i_frame_length * p_sys->header.frames_per_packet /
790 (mtime_t)p_enc->fmt_in.audio.i_rate;
792 p_block->i_dts = p_block->i_pts = p_sys->i_pts;
795 p_sys->i_pts += p_block->i_length;
796 block_ChainAppend( &p_chain, p_block );
800 /* Backup the remaining raw samples */
803 memcpy( p_sys->p_buffer + i_samples_delay * 2 *
804 p_enc->fmt_in.audio.i_channels, p_buffer,
805 i_samples * 2 * p_enc->fmt_in.audio.i_channels );
811 /*****************************************************************************
812 * CloseEncoder: encoder destruction
813 *****************************************************************************/
814 static void CloseEncoder( vlc_object_t *p_this )
816 encoder_t *p_enc = (encoder_t *)p_this;
817 encoder_sys_t *p_sys = p_enc->p_sys;
819 speex_encoder_destroy( p_sys->p_state );
820 speex_bits_destroy( &p_sys->bits );
822 if( p_sys->p_buffer ) free( p_sys->p_buffer );