git.sesse.net Git - vlc/blob - modules/codec/flac.c

   1 /*****************************************************************************
   2  * flac.c: flac decoder/packetizer/encoder module making use of libflac
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *          Sigmund Augdal Helberg <dnumgis@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  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 General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_codec.h>
  36 #include <vlc_aout.h>
  37
  38 #ifdef HAVE_FLAC_STREAM_DECODER_H
  39 #   include <FLAC/stream_decoder.h>
  40 #   include <FLAC/stream_encoder.h>
  41 #   define USE_LIBFLAC
  42 #endif
  43
  44 #include <vlc_block_helper.h>
  45 #include <vlc_bits.h>
  46
  47 #define MAX_FLAC_HEADER_SIZE 16
  48
  49 #if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT >= 8
  50 #   define USE_NEW_FLAC_API
  51 #endif
  52
  53 /*****************************************************************************
  54  * decoder_sys_t : FLAC decoder descriptor
  55  *****************************************************************************/
  56 struct decoder_sys_t
  57 {
  58     /*
  59      * Input properties
  60      */
  61     int i_state;
  62
  63     block_bytestream_t bytestream;
  64
  65     /*
  66      * Input/Output properties
  67      */
  68     block_t *p_block;
  69     aout_buffer_t *p_aout_buffer;
  70
  71     /*
  72      * FLAC properties
  73      */
  74 #ifdef USE_LIBFLAC
  75     FLAC__StreamDecoder *p_flac;
  76     FLAC__StreamMetadata_StreamInfo stream_info;
  77 #else
  78     struct
  79     {
  80         unsigned min_blocksize, max_blocksize;
  81         unsigned min_framesize, max_framesize;
  82         unsigned sample_rate;
  83         unsigned channels;
  84         unsigned bits_per_sample;
  85
  86     } stream_info;
  87 #endif
  88     bool b_stream_info;
  89
  90     /*
  91      * Common properties
  92      */
  93     date_t  end_date;
  94     mtime_t i_pts;
  95
  96     int i_frame_size, i_frame_length, i_bits_per_sample;
  97     unsigned int i_rate, i_channels, i_channels_conf;
  98 };
  99
 100 enum {
 101
 102     STATE_NOSYNC,
 103     STATE_SYNC,
 104     STATE_HEADER,
 105     STATE_NEXT_SYNC,
 106     STATE_GET_DATA,
 107     STATE_SEND_DATA
 108 };
 109
 110 static const int pi_channels_maps[7] =
 111 {
 112     0,
 113     AOUT_CHAN_CENTER,
 114     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
 115     AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
 116     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
 117      | AOUT_CHAN_REARRIGHT,
 118     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 119      | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
 120     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 121      | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
 122 };
 123
 124 /*****************************************************************************
 125  * Local prototypes
 126  *****************************************************************************/
 127 static int  OpenDecoder   ( vlc_object_t * );
 128 static int  OpenPacketizer( vlc_object_t * );
 129 static void CloseDecoder  ( vlc_object_t * );
 130
 131 #ifdef USE_LIBFLAC
 132 static int OpenEncoder   ( vlc_object_t * );
 133 static void CloseEncoder ( vlc_object_t * );
 134 #endif
 135
 136 #ifdef USE_LIBFLAC
 137 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
 138 #endif
 139 static block_t *PacketizeBlock( decoder_t *, block_t ** );
 140
 141 static int SyncInfo( decoder_t *, uint8_t *, unsigned int *, unsigned int *,
 142                      unsigned int *,int * );
 143
 144
 145 #ifdef USE_LIBFLAC
 146 static FLAC__StreamDecoderReadStatus
 147 DecoderReadCallback( const FLAC__StreamDecoder *decoder,
 148                      FLAC__byte buffer[], unsigned *bytes, void *client_data );
 149
 150 static FLAC__StreamDecoderWriteStatus
 151 DecoderWriteCallback( const FLAC__StreamDecoder *decoder,
 152                       const FLAC__Frame *frame,
 153                       const FLAC__int32 *const buffer[], void *client_data );
 154
 155 static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder,
 156                                      const FLAC__StreamMetadata *metadata,
 157                                      void *client_data );
 158 static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder,
 159                                   FLAC__StreamDecoderErrorStatus status,
 160                                   void *client_data);
 161
 162 static void Interleave32( int32_t *p_out, const int32_t * const *pp_in,
 163                           const int *pi_order, int i_nb_channels, int i_samples );
 164 static void Interleave24( int8_t *p_out, const int32_t * const *pp_in,
 165                           const int *pi_order, int i_nb_channels, int i_samples );
 166 static void Interleave16( int16_t *p_out, const int32_t * const *pp_in,
 167                           const int *pi_order, int i_nb_channels, int i_samples );
 168
 169 static void decoder_state_error( decoder_t *p_dec,
 170                                  FLAC__StreamDecoderState state );
 171 #endif
 172
 173 static uint64_t read_utf8( const uint8_t *p_buf, int *pi_read );
 174 static uint8_t flac_crc8( const uint8_t *data, unsigned len );
 175
 176 /*****************************************************************************
 177  * Module descriptor
 178  *****************************************************************************/
 179 vlc_module_begin ()
 180
 181     set_category( CAT_INPUT )
 182     set_subcategory( SUBCAT_INPUT_ACODEC )
 183     add_shortcut( "flac" )
 184
 185 #ifdef USE_LIBFLAC
 186     set_description( N_("Flac audio decoder") )
 187     set_capability( "decoder", 100 )
 188     set_callbacks( OpenDecoder, CloseDecoder )
 189
 190     add_submodule ()
 191     add_shortcut( "flac" )
 192     set_description( N_("Flac audio encoder") )
 193     set_capability( "encoder", 100 )
 194     set_callbacks( OpenEncoder, CloseEncoder )
 195
 196     add_submodule ()
 197     add_shortcut( "flac" )
 198 #endif
 199     set_description( N_("Flac audio packetizer") )
 200     set_capability( "packetizer", 100 )
 201     set_callbacks( OpenPacketizer, CloseDecoder )
 202
 203 vlc_module_end ()
 204
 205 /*****************************************************************************
 206  * OpenDecoder: probe the decoder and return score
 207  *****************************************************************************/
 208 static int OpenDecoder( vlc_object_t *p_this )
 209 {
 210     decoder_t *p_dec = (decoder_t*)p_this;
 211     decoder_sys_t *p_sys;
 212
 213     if( p_dec->fmt_in.i_codec != VLC_CODEC_FLAC )
 214     {
 215         return VLC_EGENERIC;
 216     }
 217
 218     /* Allocate the memory needed to store the decoder's structure */
 219     if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
 220         return VLC_ENOMEM;
 221
 222     /* Misc init */
 223     date_Set( &p_sys->end_date, 0 );
 224     p_sys->i_state = STATE_NOSYNC;
 225     p_sys->b_stream_info = false;
 226     p_sys->p_block=NULL;
 227     p_sys->i_pts = VLC_TS_INVALID;
 228     p_sys->bytestream = block_BytestreamInit();
 229
 230 #ifdef USE_LIBFLAC
 231     /* Take care of flac init */
 232     if( !(p_sys->p_flac = FLAC__stream_decoder_new()) )
 233     {
 234         msg_Err( p_dec, "FLAC__stream_decoder_new() failed" );
 235         free( p_sys );
 236         return VLC_EGENERIC;
 237     }
 238
 239 #ifdef USE_NEW_FLAC_API
 240     if( FLAC__stream_decoder_init_stream( p_sys->p_flac,
 241                                           DecoderReadCallback,
 242                                           NULL,
 243                                           NULL,
 244                                           NULL,
 245                                           NULL,
 246                                           DecoderWriteCallback,
 247                                           DecoderMetadataCallback,
 248                                           DecoderErrorCallback,
 249                                           p_dec )
 250         != FLAC__STREAM_DECODER_INIT_STATUS_OK )
 251     {
 252         msg_Err( p_dec, "FLAC__stream_decoder_init_stream() failed" );
 253         FLAC__stream_decoder_delete( p_sys->p_flac );
 254         free( p_sys );
 255         return VLC_EGENERIC;
 256     }
 257 #else
 258     FLAC__stream_decoder_set_read_callback( p_sys->p_flac,
 259                                             DecoderReadCallback );
 260     FLAC__stream_decoder_set_write_callback( p_sys->p_flac,
 261                                              DecoderWriteCallback );
 262     FLAC__stream_decoder_set_metadata_callback( p_sys->p_flac,
 263                                                 DecoderMetadataCallback );
 264     FLAC__stream_decoder_set_error_callback( p_sys->p_flac,
 265                                              DecoderErrorCallback );
 266     FLAC__stream_decoder_set_client_data( p_sys->p_flac, p_dec );
 267
 268     FLAC__stream_decoder_init( p_sys->p_flac );
 269 #endif
 270 #endif
 271
 272     /* Set output properties */
 273     p_dec->fmt_out.i_cat = AUDIO_ES;
 274     p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
 275
 276     /* Set callbacks */
 277 #ifdef USE_LIBFLAC
 278     p_dec->pf_decode_audio = DecodeBlock;
 279 #endif
 280
 281     return VLC_SUCCESS;
 282 }
 283
 284 static int OpenPacketizer( vlc_object_t *p_this )
 285 {
 286     decoder_t *p_dec = (decoder_t*)p_this;
 287     es_format_t es_save = p_dec->fmt_out;
 288     int i_ret;
 289
 290     /* */
 291     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 292
 293     i_ret = OpenDecoder( p_this );
 294     p_dec->pf_decode_audio = NULL;
 295     p_dec->pf_packetize    = PacketizeBlock;
 296
 297     /* Set output properties */
 298     p_dec->fmt_out.i_codec = VLC_CODEC_FLAC;
 299
 300     if( i_ret != VLC_SUCCESS )
 301     {
 302         es_format_Clean( &p_dec->fmt_out );
 303         p_dec->fmt_out = es_save;
 304     }
 305     return i_ret;
 306 }
 307
 308 /*****************************************************************************
 309  * CloseDecoder: flac decoder destruction
 310  *****************************************************************************/
 311 static void CloseDecoder( vlc_object_t *p_this )
 312 {
 313     decoder_t *p_dec = (decoder_t *)p_this;
 314     decoder_sys_t *p_sys = p_dec->p_sys;
 315
 316 #ifdef USE_LIBFLAC
 317     FLAC__stream_decoder_finish( p_sys->p_flac );
 318     FLAC__stream_decoder_delete( p_sys->p_flac );
 319 #endif
 320
 321     free( p_sys->p_block );
 322     free( p_sys );
 323 }
 324
 325 /*****************************************************************************
 326  * ProcessHeader: process Flac header.
 327  *****************************************************************************/
 328 static void ProcessHeader( decoder_t *p_dec )
 329 {
 330     decoder_sys_t *p_sys = p_dec->p_sys;
 331
 332 #ifdef USE_LIBFLAC
 333     if( !p_dec->fmt_in.i_extra ) return;
 334
 335     /* Decode STREAMINFO */
 336     msg_Dbg( p_dec, "decode STREAMINFO" );
 337     p_sys->p_block = block_New( p_dec, p_dec->fmt_in.i_extra );
 338     memcpy( p_sys->p_block->p_buffer, p_dec->fmt_in.p_extra,
 339             p_dec->fmt_in.i_extra );
 340     FLAC__stream_decoder_process_until_end_of_metadata( p_sys->p_flac );
 341     msg_Dbg( p_dec, "STREAMINFO decoded" );
 342
 343 #else
 344     bs_t bs;
 345
 346     if( !p_dec->fmt_in.i_extra ) return;
 347
 348     bs_init( &bs, p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
 349
 350     p_sys->stream_info.min_blocksize = bs_read( &bs, 16 );
 351     p_sys->stream_info.max_blocksize = bs_read( &bs, 16 );
 352
 353     p_sys->stream_info.min_framesize = bs_read( &bs, 24 );
 354     p_sys->stream_info.max_framesize = bs_read( &bs, 24 );
 355
 356     p_sys->stream_info.sample_rate = bs_read( &bs, 20 );
 357     p_sys->stream_info.channels = bs_read( &bs, 3 ) + 1;
 358     p_sys->stream_info.bits_per_sample = bs_read( &bs, 5 ) + 1;
 359 #endif
 360
 361     if( !p_sys->b_stream_info ) return;
 362
 363     if( p_dec->fmt_out.i_codec == VLC_CODEC_FLAC )
 364     {
 365         p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
 366         p_dec->fmt_out.p_extra = xrealloc( p_dec->fmt_out.p_extra,
 367                                                   p_dec->fmt_out.i_extra );
 368         memcpy( p_dec->fmt_out.p_extra,
 369                 p_dec->fmt_in.p_extra, p_dec->fmt_out.i_extra );
 370     }
 371 }
 372
 373 /****************************************************************************
 374  * PacketizeBlock: the whole thing
 375  ****************************************************************************
 376  * This function is called just after the thread is launched.
 377  ****************************************************************************/
 378 static block_t *PacketizeBlock( decoder_t *p_dec, block_t **pp_block )
 379 {
 380     decoder_sys_t *p_sys = p_dec->p_sys;
 381     uint8_t p_header[MAX_FLAC_HEADER_SIZE];
 382     block_t *p_sout_block;
 383
 384     if( !pp_block || !*pp_block ) return NULL;
 385
 386     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
 387     {
 388         if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
 389         {
 390             p_sys->i_state = STATE_NOSYNC;
 391             block_BytestreamEmpty( &p_sys->bytestream );
 392         }
 393         date_Set( &p_sys->end_date, 0 );
 394         block_Release( *pp_block );
 395         return NULL;
 396     }
 397
 398     if( !p_sys->b_stream_info ) ProcessHeader( p_dec );
 399
 400     if( p_sys->stream_info.channels > 6 )
 401     {
 402         msg_Err( p_dec, "This stream uses too many audio channels" );
 403         return NULL;
 404     }
 405
 406     if( !date_Get( &p_sys->end_date ) && (*pp_block)->i_pts <= VLC_TS_INVALID )
 407     {
 408         /* We've just started the stream, wait for the first PTS. */
 409         block_Release( *pp_block );
 410         return NULL;
 411     }
 412     else if( !date_Get( &p_sys->end_date ) )
 413     {
 414         /* The first PTS is as good as anything else. */
 415         p_sys->i_rate = p_dec->fmt_out.audio.i_rate;
 416         date_Init( &p_sys->end_date, p_sys->i_rate, 1 );
 417         date_Set( &p_sys->end_date, (*pp_block)->i_pts );
 418     }
 419
 420     block_BytestreamPush( &p_sys->bytestream, *pp_block );
 421
 422     while( 1 )
 423     {
 424         switch( p_sys->i_state )
 425         {
 426         case STATE_NOSYNC:
 427             while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
 428                    == VLC_SUCCESS )
 429             {
 430                 if( p_header[0] == 0xFF && p_header[1] == 0xF8 )
 431                 {
 432                     p_sys->i_state = STATE_SYNC;
 433                     break;
 434                 }
 435                 block_SkipByte( &p_sys->bytestream );
 436             }
 437             if( p_sys->i_state != STATE_SYNC )
 438             {
 439                 block_BytestreamFlush( &p_sys->bytestream );
 440
 441                 /* Need more data */
 442                 return NULL;
 443             }
 444
 445         case STATE_SYNC:
 446             /* New frame, set the Presentation Time Stamp */
 447             p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
 448             if( p_sys->i_pts > VLC_TS_INVALID &&
 449                 p_sys->i_pts != date_Get( &p_sys->end_date ) )
 450             {
 451                 date_Set( &p_sys->end_date, p_sys->i_pts );
 452             }
 453             p_sys->i_state = STATE_HEADER;
 454
 455         case STATE_HEADER:
 456             /* Get FLAC frame header (MAX_FLAC_HEADER_SIZE bytes) */
 457             if( block_PeekBytes( &p_sys->bytestream, p_header,
 458                                  MAX_FLAC_HEADER_SIZE ) != VLC_SUCCESS )
 459             {
 460                 /* Need more data */
 461                 return NULL;
 462             }
 463
 464             /* Check if frame is valid and get frame info */
 465             p_sys->i_frame_length = SyncInfo( p_dec, p_header,
 466                                               &p_sys->i_channels,
 467                                               &p_sys->i_channels_conf,
 468                                               &p_sys->i_rate,
 469                                               &p_sys->i_bits_per_sample );
 470             if( !p_sys->i_frame_length )
 471             {
 472                 msg_Dbg( p_dec, "emulated sync word" );
 473                 block_SkipByte( &p_sys->bytestream );
 474                 p_sys->i_state = STATE_NOSYNC;
 475                 break;
 476             }
 477             if( p_sys->i_rate != p_dec->fmt_out.audio.i_rate )
 478             {
 479                 p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
 480                 date_Init( &p_sys->end_date, p_sys->i_rate, 1 );
 481                 date_Set( &p_sys->end_date, p_sys->i_pts );
 482             }
 483             p_sys->i_state = STATE_NEXT_SYNC;
 484             p_sys->i_frame_size = 1;
 485
 486         case STATE_NEXT_SYNC:
 487             /* TODO: If pp_block == NULL, flush the buffer without checking the
 488              * next sync word */
 489
 490             /* Check if next expected frame contains the sync word */
 491             while( block_PeekOffsetBytes( &p_sys->bytestream,
 492                                           p_sys->i_frame_size, p_header,
 493                                           MAX_FLAC_HEADER_SIZE )
 494                    == VLC_SUCCESS )
 495             {
 496                 if( p_header[0] == 0xFF && p_header[1] == 0xF8 )
 497                 {
 498                     /* Check if frame is valid and get frame info */
 499                     int i_frame_length =
 500                         SyncInfo( p_dec, p_header,
 501                                   &p_sys->i_channels,
 502                                   &p_sys->i_channels_conf,
 503                                   &p_sys->i_rate,
 504                                   &p_sys->i_bits_per_sample );
 505
 506                     if( i_frame_length )
 507                     {
 508                         p_sys->i_state = STATE_SEND_DATA;
 509                         break;
 510                     }
 511                 }
 512                 p_sys->i_frame_size++;
 513             }
 514
 515             if( p_sys->i_state != STATE_SEND_DATA )
 516             {
 517                 /* Need more data */
 518                 return NULL;
 519             }
 520
 521         case STATE_SEND_DATA:
 522             p_sout_block = block_New( p_dec, p_sys->i_frame_size );
 523
 524             /* Copy the whole frame into the buffer. When we reach this point
 525              * we already know we have enough data available. */
 526             block_GetBytes( &p_sys->bytestream, p_sout_block->p_buffer,
 527                             p_sys->i_frame_size );
 528
 529             /* Make sure we don't reuse the same pts twice */
 530             if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
 531                 p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
 532
 533             /* So p_block doesn't get re-added several times */
 534             *pp_block = block_BytestreamPop( &p_sys->bytestream );
 535
 536             p_sys->i_state = STATE_NOSYNC;
 537
 538             /* Date management */
 539             p_sout_block->i_pts =
 540                 p_sout_block->i_dts = date_Get( &p_sys->end_date );
 541             date_Increment( &p_sys->end_date, p_sys->i_frame_length );
 542             p_sout_block->i_length =
 543                 date_Get( &p_sys->end_date ) - p_sout_block->i_pts;
 544
 545             return p_sout_block;
 546         }
 547     }
 548
 549     return NULL;
 550 }
 551
 552 #ifdef USE_LIBFLAC
 553 /****************************************************************************
 554  * DecodeBlock: the whole thing
 555  ****************************************************************************/
 556 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 557 {
 558     decoder_sys_t *p_sys = p_dec->p_sys;
 559
 560     if( !pp_block || !*pp_block ) return NULL;
 561
 562     p_sys->p_aout_buffer = 0;
 563     if( ( p_sys->p_block = PacketizeBlock( p_dec, pp_block ) ) )
 564     {
 565         if( !FLAC__stream_decoder_process_single( p_sys->p_flac ) )
 566         {
 567             decoder_state_error( p_dec,
 568                 FLAC__stream_decoder_get_state( p_sys->p_flac ) );
 569             FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
 570         }
 571
 572         /* If the decoder is in the "aborted" state,
 573          * FLAC__stream_decoder_process_single() won't return an error. */
 574         if( FLAC__stream_decoder_get_state(p_dec->p_sys->p_flac)
 575             == FLAC__STREAM_DECODER_ABORTED )
 576         {
 577             FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
 578         }
 579
 580         block_Release( p_sys->p_block );
 581         p_sys->p_block = NULL;
 582     }
 583
 584     return p_sys->p_aout_buffer;
 585 }
 586
 587 /*****************************************************************************
 588  * DecoderReadCallback: called by libflac when it needs more data
 589  *****************************************************************************/
 590 static FLAC__StreamDecoderReadStatus
 591 DecoderReadCallback( const FLAC__StreamDecoder *decoder, FLAC__byte buffer[],
 592                      unsigned *bytes, void *client_data )
 593 {
 594     VLC_UNUSED(decoder);
 595     decoder_t *p_dec = (decoder_t *)client_data;
 596     decoder_sys_t *p_sys = p_dec->p_sys;
 597
 598     if( p_sys->p_block && p_sys->p_block->i_buffer )
 599     {
 600         *bytes = __MIN(*bytes, (unsigned)p_sys->p_block->i_buffer);
 601         memcpy( buffer, p_sys->p_block->p_buffer, *bytes );
 602         p_sys->p_block->i_buffer -= *bytes;
 603         p_sys->p_block->p_buffer += *bytes;
 604     }
 605     else
 606     {
 607         *bytes = 0;
 608         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
 609     }
 610
 611     return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
 612 }
 613
 614 /*****************************************************************************
 615  * DecoderWriteCallback: called by libflac to output decoded samples
 616  *****************************************************************************/
 617 static FLAC__StreamDecoderWriteStatus
 618 DecoderWriteCallback( const FLAC__StreamDecoder *decoder,
 619                       const FLAC__Frame *frame,
 620                       const FLAC__int32 *const buffer[], void *client_data )
 621 {
 622     /* XXX it supposes our internal format is WG4 */
 623     static const int ppi_reorder[1+8][8] = {
 624         {-1},
 625         { 0, },
 626         { 0, 1 },
 627         { 0, 1, 2 },
 628         { 0, 1, 2, 3 },
 629         { 0, 1, 3, 4, 2 },
 630         { 0, 1, 4, 5, 2, 3 },
 631
 632         { 0, 1, 6, 2, 3, 4, 5 },    /* 7.0 Unspecified by flac */
 633         { 0, 1, 6, 7, 2, 3, 4, 5 }, /* 7.1 Unspecified by flac */
 634     };
 635
 636     VLC_UNUSED(decoder);
 637     decoder_t *p_dec = (decoder_t *)client_data;
 638     decoder_sys_t *p_sys = p_dec->p_sys;
 639
 640     if( p_dec->fmt_out.audio.i_channels <= 0 ||
 641         p_dec->fmt_out.audio.i_channels > 8 )
 642         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 643     const int * const pi_reorder = ppi_reorder[p_dec->fmt_out.audio.i_channels];
 644
 645     p_sys->p_aout_buffer =
 646         decoder_NewAudioBuffer( p_dec, frame->header.blocksize );
 647
 648     if( p_sys->p_aout_buffer == NULL )
 649         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 650
 651     switch( frame->header.bits_per_sample )
 652     {
 653     case 16:
 654         Interleave16( (int16_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
 655                       frame->header.channels, frame->header.blocksize );
 656         break;
 657     case 24:
 658         Interleave24( (int8_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
 659                       frame->header.channels, frame->header.blocksize );
 660         break;
 661     default:
 662         Interleave32( (int32_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
 663                       frame->header.channels, frame->header.blocksize );
 664     }
 665
 666     /* Date management (already done by packetizer) */
 667     p_sys->p_aout_buffer->i_pts = p_sys->p_block->i_pts;
 668     p_sys->p_aout_buffer->i_length = p_sys->p_block->i_length;
 669
 670     return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 671 }
 672
 673 /*****************************************************************************
 674  * DecoderMetadataCallback: called by libflac to when it encounters metadata
 675  *****************************************************************************/
 676 static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder,
 677                                      const FLAC__StreamMetadata *metadata,
 678                                      void *client_data )
 679 {
 680     VLC_UNUSED(decoder);
 681     decoder_t *p_dec = (decoder_t *)client_data;
 682     decoder_sys_t *p_sys = p_dec->p_sys;
 683
 684     if( p_dec->pf_decode_audio )
 685     {
 686         switch( metadata->data.stream_info.bits_per_sample )
 687         {
 688         case 8:
 689             p_dec->fmt_out.i_codec = VLC_CODEC_S8;
 690             break;
 691         case 16:
 692             p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
 693             break;
 694         case 24:
 695             p_dec->fmt_out.i_codec = VLC_CODEC_S24N;
 696             break;
 697         default:
 698             msg_Dbg( p_dec, "strange bit/sample value: %d",
 699                      metadata->data.stream_info.bits_per_sample );
 700             p_dec->fmt_out.i_codec = VLC_CODEC_FI32;
 701             break;
 702         }
 703     }
 704
 705     /* Setup the format */
 706     p_dec->fmt_out.audio.i_rate     = metadata->data.stream_info.sample_rate;
 707     p_dec->fmt_out.audio.i_channels = metadata->data.stream_info.channels;
 708     p_dec->fmt_out.audio.i_physical_channels =
 709         p_dec->fmt_out.audio.i_original_channels =
 710             pi_channels_maps[metadata->data.stream_info.channels];
 711     p_dec->fmt_out.audio.i_bitspersample =
 712         metadata->data.stream_info.bits_per_sample;
 713
 714     date_Init( &p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1 );
 715
 716     msg_Dbg( p_dec, "channels:%d samplerate:%d bitspersamples:%d",
 717              p_dec->fmt_out.audio.i_channels, p_dec->fmt_out.audio.i_rate,
 718              p_dec->fmt_out.audio.i_bitspersample );
 719
 720     p_sys->b_stream_info = true;
 721     p_sys->stream_info = metadata->data.stream_info;
 722
 723     return;
 724 }
 725
 726 /*****************************************************************************
 727  * DecoderErrorCallback: called when the libflac decoder encounters an error
 728  *****************************************************************************/
 729 static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder,
 730                                   FLAC__StreamDecoderErrorStatus status,
 731                                   void *client_data )
 732 {
 733     VLC_UNUSED(decoder);
 734     decoder_t *p_dec = (decoder_t *)client_data;
 735
 736     switch( status )
 737     {
 738     case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC:
 739         msg_Warn( p_dec, "an error in the stream caused the decoder to "
 740                  "lose synchronization." );
 741         break;
 742     case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER:
 743         msg_Err( p_dec, "the decoder encountered a corrupted frame header." );
 744         break;
 745     case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH:
 746         msg_Err( p_dec, "frame's data did not match the CRC in the "
 747                  "footer." );
 748         break;
 749     default:
 750         msg_Err( p_dec, "got decoder error: %d", status );
 751     }
 752
 753     FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
 754     return;
 755 }
 756
 757 /*****************************************************************************
 758  * Interleave: helper function to interleave channels
 759  *****************************************************************************/
 760 static void Interleave32( int32_t *p_out, const int32_t * const *pp_in,
 761                           const int pi_index[],
 762                           int i_nb_channels, int i_samples )
 763 {
 764     int i, j;
 765     for ( j = 0; j < i_samples; j++ )
 766     {
 767         for ( i = 0; i < i_nb_channels; i++ )
 768         {
 769             p_out[j * i_nb_channels + i] = pp_in[pi_index[i]][j];
 770         }
 771     }
 772 }
 773
 774 static void Interleave24( int8_t *p_out, const int32_t * const *pp_in,
 775                           const int pi_index[],
 776                           int i_nb_channels, int i_samples )
 777 {
 778     int i, j;
 779     for ( j = 0; j < i_samples; j++ )
 780     {
 781         for ( i = 0; i < i_nb_channels; i++ )
 782         {
 783             const int i_index = pi_index[i];
 784 #ifdef WORDS_BIGENDIAN
 785             p_out[3*(j * i_nb_channels + i)+0] = (pp_in[i_index][j] >> 16) & 0xff;
 786             p_out[3*(j * i_nb_channels + i)+1] = (pp_in[i_index][j] >> 8 ) & 0xff;
 787             p_out[3*(j * i_nb_channels + i)+2] = (pp_in[i_index][j] >> 0 ) & 0xff;
 788 #else
 789             p_out[3*(j * i_nb_channels + i)+2] = (pp_in[i_index][j] >> 16) & 0xff;
 790             p_out[3*(j * i_nb_channels + i)+1] = (pp_in[i_index][j] >> 8 ) & 0xff;
 791             p_out[3*(j * i_nb_channels + i)+0] = (pp_in[i_index][j] >> 0 ) & 0xff;
 792 #endif
 793         }
 794     }
 795 }
 796
 797 static void Interleave16( int16_t *p_out, const int32_t * const *pp_in,
 798                           const int pi_index[],
 799                           int i_nb_channels, int i_samples )
 800 {
 801     int i, j;
 802     for ( j = 0; j < i_samples; j++ )
 803     {
 804         for ( i = 0; i < i_nb_channels; i++ )
 805         {
 806             p_out[j * i_nb_channels + i] = (int32_t)(pp_in[pi_index[i]][j]);
 807         }
 808     }
 809 }
 810
 811 /*****************************************************************************
 812  * decoder_state_error: print meaningful error messages
 813  *****************************************************************************/
 814 static void decoder_state_error( decoder_t *p_dec,
 815                                  FLAC__StreamDecoderState state )
 816 {
 817     switch ( state )
 818     {
 819     case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
 820         msg_Dbg( p_dec, "the decoder is ready to search for metadata." );
 821         break;
 822     case FLAC__STREAM_DECODER_READ_METADATA:
 823         msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
 824                  "reading metadata." );
 825         break;
 826     case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
 827         msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
 828                  "searching for the frame sync code." );
 829         break;
 830     case FLAC__STREAM_DECODER_READ_FRAME:
 831         msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
 832                  "reading a frame." );
 833         break;
 834     case FLAC__STREAM_DECODER_END_OF_STREAM:
 835         msg_Dbg( p_dec, "the decoder has reached the end of the stream." );
 836         break;
 837 #ifdef USE_NEW_FLAC_API
 838     case FLAC__STREAM_DECODER_OGG_ERROR:
 839         msg_Err( p_dec, "error occurred in the Ogg layer." );
 840         break;
 841     case FLAC__STREAM_DECODER_SEEK_ERROR:
 842         msg_Err( p_dec, "error occurred while seeking." );
 843         break;
 844 #endif
 845     case FLAC__STREAM_DECODER_ABORTED:
 846         msg_Warn( p_dec, "the decoder was aborted by the read callback." );
 847         break;
 848 #ifndef USE_NEW_FLAC_API
 849     case FLAC__STREAM_DECODER_UNPARSEABLE_STREAM:
 850         msg_Warn( p_dec, "the decoder encountered reserved fields in use "
 851                  "in the stream." );
 852         break;
 853 #endif
 854     case FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
 855         msg_Err( p_dec, "error when allocating memory." );
 856         break;
 857 #ifndef USE_NEW_FLAC_API
 858     case FLAC__STREAM_DECODER_ALREADY_INITIALIZED:
 859         msg_Err( p_dec, "FLAC__stream_decoder_init() was called when the "
 860                  "decoder was already initialized, usually because "
 861                  "FLAC__stream_decoder_finish() was not called." );
 862         break;
 863     case FLAC__STREAM_DECODER_INVALID_CALLBACK:
 864         msg_Err( p_dec, "FLAC__stream_decoder_init() was called without "
 865                  "all callbacks being set." );
 866         break;
 867 #endif
 868     case FLAC__STREAM_DECODER_UNINITIALIZED:
 869         msg_Err( p_dec, "decoder in uninitialized state." );
 870         break;
 871     default:
 872         msg_Warn(p_dec, "unknown error" );
 873     }
 874 }
 875 #endif
 876
 877 /*****************************************************************************
 878  * SyncInfo: parse FLAC sync info
 879  *****************************************************************************/
 880 static int SyncInfo( decoder_t *p_dec, uint8_t *p_buf,
 881                      unsigned int * pi_channels,
 882                      unsigned int * pi_channels_conf,
 883                      unsigned int * pi_sample_rate,
 884                      int * pi_bits_per_sample )
 885 {
 886     decoder_sys_t *p_sys = p_dec->p_sys;
 887     int i_header, i_temp, i_read;
 888     unsigned i_blocksize = 0;
 889     int i_blocksize_hint = 0, i_sample_rate_hint = 0;
 890     uint64_t i_sample_number = 0;
 891
 892     bool b_variable_blocksize = ( p_sys->b_stream_info &&
 893         p_sys->stream_info.min_blocksize != p_sys->stream_info.max_blocksize );
 894     bool b_fixed_blocksize = ( p_sys->b_stream_info &&
 895         p_sys->stream_info.min_blocksize == p_sys->stream_info.max_blocksize );
 896
 897     /* Check syncword */
 898     if( p_buf[0] != 0xFF || p_buf[1] != 0xF8 ) return 0;
 899
 900     /* Check there is no emulated sync code in the rest of the header */
 901     if( p_buf[2] == 0xff || p_buf[3] == 0xFF ) return 0;
 902
 903     /* Find blocksize (framelength) */
 904     switch( i_temp = p_buf[2] >> 4 )
 905     {
 906     case 0:
 907         if( b_fixed_blocksize )
 908             i_blocksize = p_sys->stream_info.min_blocksize;
 909         else return 0; /* We can't do anything with this */
 910         break;
 911
 912     case 1:
 913         i_blocksize = 192;
 914         break;
 915
 916     case 2:
 917     case 3:
 918     case 4:
 919     case 5:
 920         i_blocksize = 576 << (i_temp - 2);
 921         break;
 922
 923     case 6:
 924     case 7:
 925         i_blocksize_hint = i_temp;
 926         break;
 927
 928     case 8:
 929     case 9:
 930     case 10:
 931     case 11:
 932     case 12:
 933     case 13:
 934     case 14:
 935     case 15:
 936         i_blocksize = 256 << (i_temp - 8);
 937         break;
 938     }
 939
 940     /* Find samplerate */
 941     switch( i_temp = p_buf[2] & 0x0f )
 942     {
 943     case 0:
 944         if( p_sys->b_stream_info )
 945             *pi_sample_rate = p_sys->stream_info.sample_rate;
 946         else return 0; /* We can't do anything with this */
 947         break;
 948
 949     case 1:
 950     case 2:
 951     case 3:
 952         return 0;
 953         break;
 954
 955     case 4:
 956         *pi_sample_rate = 8000;
 957         break;
 958
 959     case 5:
 960         *pi_sample_rate = 16000;
 961         break;
 962
 963     case 6:
 964         *pi_sample_rate = 22050;
 965         break;
 966
 967     case 7:
 968         *pi_sample_rate = 24000;
 969         break;
 970
 971     case 8:
 972         *pi_sample_rate = 32000;
 973         break;
 974
 975     case 9:
 976         *pi_sample_rate = 44100;
 977         break;
 978
 979     case 10:
 980         *pi_sample_rate = 48000;
 981         break;
 982
 983     case 11:
 984         *pi_sample_rate = 96000;
 985         break;
 986
 987     case 12:
 988     case 13:
 989     case 14:
 990         i_sample_rate_hint = i_temp;
 991         break;
 992
 993     case 15:
 994         return 0;
 995     }
 996
 997     /* Find channels */
 998     i_temp = (unsigned)(p_buf[3] >> 4);
 999     if( i_temp & 8 )
1000     {
1001 #ifdef USE_LIBFLAC
1002         int i_channel_assignment; /* ??? */
1003
1004         switch( i_temp & 7 )
1005         {
1006         case 0:
1007             i_channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1008             break;
1009         case 1:
1010             i_channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1011             break;
1012         case 2:
1013             i_channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1014             break;
1015         default:
1016             return 0;
1017             break;
1018         }
1019 #endif
1020
1021         *pi_channels = 2;
1022     }
1023     else
1024     {
1025         *pi_channels = i_temp + 1;
1026         *pi_channels_conf = pi_channels_maps[ *pi_channels ];
1027     }
1028
1029     /* Find bits per sample */
1030     switch( i_temp = (unsigned)(p_buf[3] & 0x0e) >> 1 )
1031     {
1032     case 0:
1033         if( p_sys->b_stream_info )
1034             *pi_bits_per_sample = p_sys->stream_info.bits_per_sample;
1035         else
1036             return 0;
1037         break;
1038
1039     case 1:
1040         *pi_bits_per_sample = 8;
1041         break;
1042
1043     case 2:
1044         *pi_bits_per_sample = 12;
1045         break;
1046
1047     case 4:
1048         *pi_bits_per_sample = 16;
1049         break;
1050
1051     case 5:
1052         *pi_bits_per_sample = 20;
1053         break;
1054
1055     case 6:
1056         *pi_bits_per_sample = 24;
1057         break;
1058
1059     case 3:
1060     case 7:
1061         return 0;
1062         break;
1063     }
1064
1065     /* Zero padding bit */
1066     if( p_buf[3] & 0x01 ) return 0;
1067
1068     /* End of fixed size header */
1069     i_header = 4;
1070
1071     /* Find Sample/Frame number */
1072     if( i_blocksize_hint && b_variable_blocksize )
1073     {
1074         i_sample_number = read_utf8( &p_buf[i_header++], &i_read );
1075         if( i_sample_number == INT64_C(0xffffffffffffffff) ) return 0;
1076     }
1077     else
1078     {
1079         i_sample_number = read_utf8( &p_buf[i_header++], &i_read );
1080         if( i_sample_number == INT64_C(0xffffffffffffffff) ) return 0;
1081
1082         if( p_sys->b_stream_info )
1083             i_sample_number *= p_sys->stream_info.min_blocksize;
1084     }
1085
1086     i_header += i_read;
1087
1088     /* Read blocksize */
1089     if( i_blocksize_hint )
1090     {
1091         int i_val1 = p_buf[i_header++];
1092         if( i_blocksize_hint == 7 )
1093         {
1094             int i_val2 = p_buf[i_header++];
1095             i_val1 = (i_val1 << 8) | i_val2;
1096         }
1097         i_blocksize = i_val1 + 1;
1098     }
1099
1100     /* Read sample rate */
1101     if( i_sample_rate_hint )
1102     {
1103         int i_val1 = p_buf[i_header++];
1104         if( i_sample_rate_hint != 12 )
1105         {
1106             int i_val2 = p_buf[i_header++];
1107             i_val1 = (i_val1 << 8) | i_val2;
1108         }
1109         if( i_sample_rate_hint == 12 ) *pi_sample_rate = i_val1 * 1000;
1110         else if( i_sample_rate_hint == 13 ) *pi_sample_rate = i_val1;
1111         else *pi_sample_rate = i_val1 * 10;
1112     }
1113
1114     /* Check the CRC-8 byte */
1115     if( flac_crc8( p_buf, i_header ) != p_buf[i_header] )
1116     {
1117         return 0;
1118     }
1119
1120     /* Sanity check using stream info header when possible */
1121     if( p_sys->b_stream_info )
1122     {
1123         if( i_blocksize < p_sys->stream_info.min_blocksize ||
1124             i_blocksize > p_sys->stream_info.max_blocksize )
1125             return 0;
1126     }
1127     return i_blocksize;
1128 }
1129
1130 /* Will return 0xffffffffffffffff for an invalid utf-8 sequence */
1131 static uint64_t read_utf8( const uint8_t *p_buf, int *pi_read )
1132 {
1133     uint64_t i_result = 0;
1134     unsigned i, j;
1135
1136     if( !(p_buf[0] & 0x80) ) /* 0xxxxxxx */
1137     {
1138         i_result = p_buf[0];
1139         i = 0;
1140     }
1141     else if( p_buf[0] & 0xC0 && !(p_buf[0] & 0x20) ) /* 110xxxxx */
1142     {
1143         i_result = p_buf[0] & 0x1F;
1144         i = 1;
1145     }
1146     else if( p_buf[0] & 0xE0 && !(p_buf[0] & 0x10) ) /* 1110xxxx */
1147     {
1148         i_result = p_buf[0] & 0x0F;
1149         i = 2;
1150     }
1151     else if( p_buf[0] & 0xF0 && !(p_buf[0] & 0x08) ) /* 11110xxx */
1152     {
1153         i_result = p_buf[0] & 0x07;
1154         i = 3;
1155     }
1156     else if( p_buf[0] & 0xF8 && !(p_buf[0] & 0x04) ) /* 111110xx */
1157     {
1158         i_result = p_buf[0] & 0x03;
1159         i = 4;
1160     }
1161     else if( p_buf[0] & 0xFC && !(p_buf[0] & 0x02) ) /* 1111110x */
1162     {
1163         i_result = p_buf[0] & 0x01;
1164         i = 5;
1165     }
1166     else if( p_buf[0] & 0xFE && !(p_buf[0] & 0x01) ) /* 11111110 */
1167     {
1168         i_result = 0;
1169         i = 6;
1170     }
1171     else {
1172         return INT64_C(0xffffffffffffffff);
1173     }
1174
1175     for( j = 1; j <= i; j++ )
1176     {
1177         if( !(p_buf[j] & 0x80) || (p_buf[j] & 0x40) ) /* 10xxxxxx */
1178         {
1179             return INT64_C(0xffffffffffffffff);
1180         }
1181         i_result <<= 6;
1182         i_result |= (p_buf[j] & 0x3F);
1183     }
1184
1185     *pi_read = i;
1186     return i_result;
1187 }
1188
1189 /* CRC-8, poly = x^8 + x^2 + x^1 + x^0, init = 0 */
1190 static const uint8_t flac_crc8_table[256] = {
1191         0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
1192         0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
1193         0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
1194         0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
1195         0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
1196         0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
1197         0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
1198         0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
1199         0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
1200         0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
1201         0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
1202         0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
1203         0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
1204         0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
1205         0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
1206         0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
1207         0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
1208         0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
1209         0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
1210         0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
1211         0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
1212         0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
1213         0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
1214         0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
1215         0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
1216         0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
1217         0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
1218         0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
1219         0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
1220         0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
1221         0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
1222         0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
1223 };
1224
1225 static uint8_t flac_crc8( const uint8_t *data, unsigned len )
1226 {
1227     uint8_t crc = 0;
1228
1229     while(len--)
1230         crc = flac_crc8_table[crc ^ *data++];
1231
1232     return crc;
1233 }
1234
1235 #ifdef USE_LIBFLAC
1236 /*****************************************************************************
1237  * encoder_sys_t : flac encoder descriptor
1238  *****************************************************************************/
1239 struct encoder_sys_t
1240 {
1241     /*
1242      * Input properties
1243      */
1244     int i_headers;
1245
1246     int i_samples_delay;
1247     int i_channels;
1248
1249     FLAC__int32 *p_buffer;
1250     unsigned int i_buffer;
1251
1252     block_t *p_chain;
1253
1254     /*
1255      * FLAC properties
1256      */
1257     FLAC__StreamEncoder *p_flac;
1258     FLAC__StreamMetadata_StreamInfo stream_info;
1259
1260     /*
1261      * Common properties
1262      */
1263     mtime_t i_pts;
1264 };
1265
1266 #define STREAMINFO_SIZE 38
1267
1268 static block_t *Encode( encoder_t *, aout_buffer_t * );
1269
1270 static FLAC__StreamEncoderWriteStatus
1271 EncoderWriteCallback( const FLAC__StreamEncoder *encoder,
1272                       const FLAC__byte buffer[],
1273                       unsigned bytes, unsigned samples,
1274                       unsigned current_frame, void *client_data );
1275
1276 static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder,
1277                                      const FLAC__StreamMetadata *metadata,
1278                                      void *client_data );
1279
1280 /*****************************************************************************
1281  * OpenEncoder: probe the encoder and return score
1282  *****************************************************************************/
1283 static int OpenEncoder( vlc_object_t *p_this )
1284 {
1285     encoder_t *p_enc = (encoder_t *)p_this;
1286     encoder_sys_t *p_sys;
1287
1288     if( p_enc->fmt_out.i_codec != VLC_CODEC_FLAC &&
1289         !p_enc->b_force )
1290     {
1291         return VLC_EGENERIC;
1292     }
1293
1294     /* Allocate the memory needed to store the decoder's structure */
1295     if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
1296         return VLC_ENOMEM;
1297     p_enc->p_sys = p_sys;
1298     p_enc->pf_encode_audio = Encode;
1299     p_enc->fmt_out.i_codec = VLC_CODEC_FLAC;
1300
1301     p_sys->i_headers = 0;
1302     p_sys->p_buffer = 0;
1303     p_sys->i_buffer = 0;
1304     p_sys->i_samples_delay = 0;
1305
1306     /* Create flac encoder */
1307     if( !(p_sys->p_flac = FLAC__stream_encoder_new()) )
1308     {
1309         msg_Err( p_enc, "FLAC__stream_encoder_new() failed" );
1310         free( p_sys );
1311         return VLC_EGENERIC;
1312     }
1313
1314     FLAC__stream_encoder_set_streamable_subset( p_sys->p_flac, 1 );
1315     FLAC__stream_encoder_set_channels( p_sys->p_flac,
1316                                        p_enc->fmt_in.audio.i_channels );
1317     FLAC__stream_encoder_set_sample_rate( p_sys->p_flac,
1318                                           p_enc->fmt_in.audio.i_rate );
1319     FLAC__stream_encoder_set_bits_per_sample( p_sys->p_flac, 16 );
1320     p_enc->fmt_in.i_codec = VLC_CODEC_S16N;
1321
1322     /* Get and store the STREAMINFO metadata block as a p_extra */
1323     p_sys->p_chain = 0;
1324
1325 #ifdef USE_NEW_FLAC_API
1326     if( FLAC__stream_encoder_init_stream( p_sys->p_flac,
1327                                           EncoderWriteCallback,
1328                                           NULL,
1329                                           NULL,
1330                                           EncoderMetadataCallback,
1331                                           p_enc )
1332         != FLAC__STREAM_ENCODER_INIT_STATUS_OK )
1333     {
1334         msg_Err( p_enc, "FLAC__stream_encoder_init_stream() failed" );
1335         FLAC__stream_encoder_delete( p_sys->p_flac );
1336         free( p_sys );
1337         return VLC_EGENERIC;
1338     }
1339 #else
1340     FLAC__stream_encoder_set_write_callback( p_sys->p_flac,
1341         EncoderWriteCallback );
1342     FLAC__stream_encoder_set_metadata_callback( p_sys->p_flac,
1343         EncoderMetadataCallback );
1344     FLAC__stream_encoder_set_client_data( p_sys->p_flac, p_enc );
1345
1346     FLAC__stream_encoder_init( p_sys->p_flac );
1347 #endif
1348
1349     return VLC_SUCCESS;
1350 }
1351
1352 /****************************************************************************
1353  * Encode: the whole thing
1354  ****************************************************************************
1355  * This function spits out ogg packets.
1356  ****************************************************************************/
1357 static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
1358 {
1359     encoder_sys_t *p_sys = p_enc->p_sys;
1360     block_t *p_chain;
1361     unsigned int i;
1362
1363     p_sys->i_pts = p_aout_buf->i_pts -
1364                 (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay /
1365                 (mtime_t)p_enc->fmt_in.audio.i_rate;
1366
1367     p_sys->i_samples_delay += p_aout_buf->i_nb_samples;
1368
1369     /* Convert samples to FLAC__int32 */
1370     if( p_sys->i_buffer < p_aout_buf->i_buffer * 2 )
1371     {
1372         p_sys->p_buffer =
1373             xrealloc( p_sys->p_buffer, p_aout_buf->i_buffer * 2 );
1374         p_sys->i_buffer = p_aout_buf->i_buffer * 2;
1375     }
1376
1377     for( i = 0 ; i < p_aout_buf->i_buffer / 2 ; i++ )
1378     {
1379         p_sys->p_buffer[i]= ((int16_t *)p_aout_buf->p_buffer)[i];
1380     }
1381
1382     FLAC__stream_encoder_process_interleaved( p_sys->p_flac, p_sys->p_buffer,
1383                                               p_aout_buf->i_nb_samples );
1384
1385     p_chain = p_sys->p_chain;
1386     p_sys->p_chain = 0;
1387
1388     return p_chain;
1389 }
1390
1391 /*****************************************************************************
1392  * CloseEncoder: encoder destruction
1393  *****************************************************************************/
1394 static void CloseEncoder( vlc_object_t *p_this )
1395 {
1396     encoder_t *p_enc = (encoder_t *)p_this;
1397     encoder_sys_t *p_sys = p_enc->p_sys;
1398
1399     FLAC__stream_encoder_delete( p_sys->p_flac );
1400
1401     free( p_sys->p_buffer );
1402     free( p_sys );
1403 }
1404
1405 /*****************************************************************************
1406  * EncoderMetadataCallback: called by libflac to output metadata
1407  *****************************************************************************/
1408 static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder,
1409                                      const FLAC__StreamMetadata *metadata,
1410                                      void *client_data )
1411 {
1412     VLC_UNUSED(encoder);
1413     encoder_t *p_enc = (encoder_t *)client_data;
1414
1415     msg_Err( p_enc, "MetadataCallback: %i", metadata->type );
1416     return;
1417 }
1418
1419 /*****************************************************************************
1420  * EncoderWriteCallback: called by libflac to output encoded samples
1421  *****************************************************************************/
1422 static FLAC__StreamEncoderWriteStatus
1423 EncoderWriteCallback( const FLAC__StreamEncoder *encoder,
1424                       const FLAC__byte buffer[],
1425                       unsigned bytes, unsigned samples,
1426                       unsigned current_frame, void *client_data )
1427 {
1428     VLC_UNUSED(encoder); VLC_UNUSED(current_frame);
1429     encoder_t *p_enc = (encoder_t *)client_data;
1430     encoder_sys_t *p_sys = p_enc->p_sys;
1431     block_t *p_block;
1432
1433     if( samples == 0 )
1434     {
1435         if( p_sys->i_headers == 1 )
1436         {
1437             msg_Dbg( p_enc, "Writing STREAMINFO: %i", bytes );
1438
1439             /* Backup the STREAMINFO metadata block */
1440             p_enc->fmt_out.i_extra = STREAMINFO_SIZE + 4;
1441             p_enc->fmt_out.p_extra = xmalloc( STREAMINFO_SIZE + 4 );
1442             memcpy( p_enc->fmt_out.p_extra, "fLaC", 4 );
1443             memcpy( ((uint8_t *)p_enc->fmt_out.p_extra) + 4, buffer,
1444                     STREAMINFO_SIZE );
1445
1446             /* Fake this as the last metadata block */
1447             ((uint8_t*)p_enc->fmt_out.p_extra)[4] |= 0x80;
1448         }
1449         p_sys->i_headers++;
1450         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
1451     }
1452
1453     p_block = block_New( p_enc, bytes );
1454     memcpy( p_block->p_buffer, buffer, bytes );
1455
1456     p_block->i_dts = p_block->i_pts = p_sys->i_pts;
1457
1458     p_sys->i_samples_delay -= samples;
1459
1460     p_block->i_length = (mtime_t)1000000 *
1461         (mtime_t)samples / (mtime_t)p_enc->fmt_in.audio.i_rate;
1462
1463     /* Update pts */
1464     p_sys->i_pts += p_block->i_length;
1465
1466     block_ChainAppend( &p_sys->p_chain, p_block );
1467
1468     return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
1469 }
1470 #endif