1 /*****************************************************************************
2 * flac.c: flac decoder/encoder module making use of libflac
3 *****************************************************************************
4 * Copyright (C) 1999-2001 the VideoLAN team
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
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.
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.
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 *****************************************************************************/
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>
41 #include <stream_decoder.h>
42 #include <stream_encoder.h>
44 #include <vlc_block_helper.h>
47 #if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT >= 8
48 # define USE_NEW_FLAC_API
51 /*****************************************************************************
52 * decoder_sys_t : FLAC decoder descriptor
53 *****************************************************************************/
57 * Input/Output properties
60 aout_buffer_t *p_aout_buffer;
66 FLAC__StreamDecoder *p_flac;
67 FLAC__StreamMetadata_StreamInfo stream_info;
71 static const int pi_channels_maps[9] =
75 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
76 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
77 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
78 | AOUT_CHAN_REARRIGHT,
79 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
80 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
81 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
82 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
83 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
84 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
85 | AOUT_CHAN_MIDDLERIGHT,
86 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
87 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
91 /*****************************************************************************
93 *****************************************************************************/
94 static int OpenDecoder ( vlc_object_t * );
95 static void CloseDecoder ( vlc_object_t * );
97 static int OpenEncoder ( vlc_object_t * );
98 static void CloseEncoder ( vlc_object_t * );
100 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
102 static FLAC__StreamDecoderReadStatus
103 DecoderReadCallback( const FLAC__StreamDecoder *decoder,
104 FLAC__byte buffer[], unsigned *bytes, void *client_data );
106 static FLAC__StreamDecoderWriteStatus
107 DecoderWriteCallback( const FLAC__StreamDecoder *decoder,
108 const FLAC__Frame *frame,
109 const FLAC__int32 *const buffer[], void *client_data );
111 static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder,
112 const FLAC__StreamMetadata *metadata,
114 static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder,
115 FLAC__StreamDecoderErrorStatus status,
118 static void Interleave32( int32_t *p_out, const int32_t * const *pp_in,
119 const int *pi_order, int i_nb_channels, int i_samples );
120 static void Interleave24( int8_t *p_out, const int32_t * const *pp_in,
121 const int *pi_order, int i_nb_channels, int i_samples );
122 static void Interleave16( int16_t *p_out, const int32_t * const *pp_in,
123 const int *pi_order, int i_nb_channels, int i_samples );
125 static void decoder_state_error( decoder_t *p_dec,
126 FLAC__StreamDecoderState state );
128 /*****************************************************************************
130 *****************************************************************************/
133 set_category( CAT_INPUT )
134 set_subcategory( SUBCAT_INPUT_ACODEC )
135 add_shortcut( "flac" )
137 set_description( N_("Flac audio decoder") )
138 set_capability( "decoder", 100 )
139 set_callbacks( OpenDecoder, CloseDecoder )
142 add_shortcut( "flac" )
143 set_description( N_("Flac audio encoder") )
144 set_capability( "encoder", 100 )
145 set_callbacks( OpenEncoder, CloseEncoder )
149 /*****************************************************************************
150 * OpenDecoder: probe the decoder and return score
151 *****************************************************************************/
152 static int OpenDecoder( vlc_object_t *p_this )
154 decoder_t *p_dec = (decoder_t*)p_this;
155 decoder_sys_t *p_sys;
157 if( p_dec->fmt_in.i_codec != VLC_CODEC_FLAC )
162 /* Allocate the memory needed to store the decoder's structure */
163 if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
167 p_sys->b_stream_info = false;
168 p_sys->p_block = NULL;
170 /* Take care of flac init */
171 if( !(p_sys->p_flac = FLAC__stream_decoder_new()) )
173 msg_Err( p_dec, "FLAC__stream_decoder_new() failed" );
178 #ifdef USE_NEW_FLAC_API
179 if( FLAC__stream_decoder_init_stream( p_sys->p_flac,
185 DecoderWriteCallback,
186 DecoderMetadataCallback,
187 DecoderErrorCallback,
189 != FLAC__STREAM_DECODER_INIT_STATUS_OK )
191 msg_Err( p_dec, "FLAC__stream_decoder_init_stream() failed" );
192 FLAC__stream_decoder_delete( p_sys->p_flac );
197 FLAC__stream_decoder_set_read_callback( p_sys->p_flac,
198 DecoderReadCallback );
199 FLAC__stream_decoder_set_write_callback( p_sys->p_flac,
200 DecoderWriteCallback );
201 FLAC__stream_decoder_set_metadata_callback( p_sys->p_flac,
202 DecoderMetadataCallback );
203 FLAC__stream_decoder_set_error_callback( p_sys->p_flac,
204 DecoderErrorCallback );
205 FLAC__stream_decoder_set_client_data( p_sys->p_flac, p_dec );
207 FLAC__stream_decoder_init( p_sys->p_flac );
210 /* Set output properties */
211 p_dec->fmt_out.i_cat = AUDIO_ES;
212 p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
215 p_dec->pf_decode_audio = DecodeBlock;
218 p_dec->b_need_packetized = true;
223 /*****************************************************************************
224 * CloseDecoder: flac decoder destruction
225 *****************************************************************************/
226 static void CloseDecoder( vlc_object_t *p_this )
228 decoder_t *p_dec = (decoder_t *)p_this;
229 decoder_sys_t *p_sys = p_dec->p_sys;
231 FLAC__stream_decoder_finish( p_sys->p_flac );
232 FLAC__stream_decoder_delete( p_sys->p_flac );
235 block_Release( p_sys->p_block );
239 /*****************************************************************************
240 * ProcessHeader: process Flac header.
241 *****************************************************************************/
242 static void ProcessHeader( decoder_t *p_dec )
244 decoder_sys_t *p_sys = p_dec->p_sys;
246 if( !p_dec->fmt_in.i_extra )
249 /* Decode STREAMINFO */
250 msg_Dbg( p_dec, "decode STREAMINFO" );
251 p_sys->p_block = block_New( p_dec, p_dec->fmt_in.i_extra );
252 memcpy( p_sys->p_block->p_buffer, p_dec->fmt_in.p_extra,
253 p_dec->fmt_in.i_extra );
254 FLAC__stream_decoder_process_until_end_of_metadata( p_sys->p_flac );
255 msg_Dbg( p_dec, "STREAMINFO decoded" );
258 /****************************************************************************
259 * DecodeBlock: the whole thing
260 ****************************************************************************/
261 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
263 decoder_sys_t *p_sys = p_dec->p_sys;
265 if( !pp_block || !*pp_block )
267 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
269 block_Release( *pp_block );
273 if( !p_sys->b_stream_info )
274 ProcessHeader( p_dec );
276 p_sys->p_block = *pp_block;
279 if( p_sys->p_block->i_pts > VLC_TS_INVALID &&
280 p_sys->p_block->i_pts != date_Get( &p_sys->end_date ) )
281 date_Set( &p_sys->end_date, p_sys->p_block->i_pts );
283 p_sys->p_aout_buffer = 0;
285 if( !FLAC__stream_decoder_process_single( p_sys->p_flac ) )
287 decoder_state_error( p_dec,
288 FLAC__stream_decoder_get_state( p_sys->p_flac ) );
289 FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
292 /* If the decoder is in the "aborted" state,
293 * FLAC__stream_decoder_process_single() won't return an error. */
294 if( FLAC__stream_decoder_get_state(p_dec->p_sys->p_flac)
295 == FLAC__STREAM_DECODER_ABORTED )
297 FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
300 block_Release( p_sys->p_block );
301 p_sys->p_block = NULL;
303 return p_sys->p_aout_buffer;
306 /*****************************************************************************
307 * DecoderReadCallback: called by libflac when it needs more data
308 *****************************************************************************/
309 static FLAC__StreamDecoderReadStatus
310 DecoderReadCallback( const FLAC__StreamDecoder *decoder, FLAC__byte buffer[],
311 unsigned *bytes, void *client_data )
314 decoder_t *p_dec = (decoder_t *)client_data;
315 decoder_sys_t *p_sys = p_dec->p_sys;
317 if( p_sys->p_block && p_sys->p_block->i_buffer )
319 *bytes = __MIN(*bytes, (unsigned)p_sys->p_block->i_buffer);
320 memcpy( buffer, p_sys->p_block->p_buffer, *bytes );
321 p_sys->p_block->i_buffer -= *bytes;
322 p_sys->p_block->p_buffer += *bytes;
327 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
330 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
333 /*****************************************************************************
334 * DecoderWriteCallback: called by libflac to output decoded samples
335 *****************************************************************************/
336 static FLAC__StreamDecoderWriteStatus
337 DecoderWriteCallback( const FLAC__StreamDecoder *decoder,
338 const FLAC__Frame *frame,
339 const FLAC__int32 *const buffer[], void *client_data )
341 /* XXX it supposes our internal format is WG4 */
342 static const int ppi_reorder[1+8][8] = {
349 { 0, 1, 4, 5, 2, 3 },
351 { 0, 1, 6, 4, 5, 2, 3 }, /* 7.0 Unspecified by flac, but following SMPTE */
352 { 0, 1, 6, 7, 4, 5, 2, 3 }, /* 7.1 Unspecified by flac, but following SMPTE */
356 decoder_t *p_dec = (decoder_t *)client_data;
357 decoder_sys_t *p_sys = p_dec->p_sys;
359 if( p_dec->fmt_out.audio.i_channels <= 0 ||
360 p_dec->fmt_out.audio.i_channels > 8 )
361 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
362 if( date_Get( &p_sys->end_date ) <= VLC_TS_INVALID )
363 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
365 const int * const pi_reorder = ppi_reorder[p_dec->fmt_out.audio.i_channels];
367 p_sys->p_aout_buffer =
368 decoder_NewAudioBuffer( p_dec, frame->header.blocksize );
370 if( p_sys->p_aout_buffer == NULL )
371 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
373 switch( frame->header.bits_per_sample )
376 Interleave16( (int16_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
377 frame->header.channels, frame->header.blocksize );
380 Interleave24( (int8_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
381 frame->header.channels, frame->header.blocksize );
384 Interleave32( (int32_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder,
385 frame->header.channels, frame->header.blocksize );
388 /* Date management (already done by packetizer) */
389 p_sys->p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
390 p_sys->p_aout_buffer->i_length =
391 date_Increment( &p_sys->end_date, frame->header.blocksize ) -
392 p_sys->p_aout_buffer->i_pts;
394 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
397 /*****************************************************************************
398 * DecoderMetadataCallback: called by libflac to when it encounters metadata
399 *****************************************************************************/
400 static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder,
401 const FLAC__StreamMetadata *metadata,
405 decoder_t *p_dec = (decoder_t *)client_data;
406 decoder_sys_t *p_sys = p_dec->p_sys;
408 if( p_dec->pf_decode_audio )
410 switch( metadata->data.stream_info.bits_per_sample )
413 p_dec->fmt_out.i_codec = VLC_CODEC_S8;
416 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
419 p_dec->fmt_out.i_codec = VLC_CODEC_S24N;
422 msg_Dbg( p_dec, "strange bit/sample value: %d",
423 metadata->data.stream_info.bits_per_sample );
424 p_dec->fmt_out.i_codec = VLC_CODEC_FI32;
429 /* Setup the format */
430 p_dec->fmt_out.audio.i_rate = metadata->data.stream_info.sample_rate;
431 p_dec->fmt_out.audio.i_channels = metadata->data.stream_info.channels;
432 p_dec->fmt_out.audio.i_physical_channels =
433 p_dec->fmt_out.audio.i_original_channels =
434 pi_channels_maps[metadata->data.stream_info.channels];
435 p_dec->fmt_out.audio.i_bitspersample =
436 metadata->data.stream_info.bits_per_sample;
438 msg_Dbg( p_dec, "channels:%d samplerate:%d bitspersamples:%d",
439 p_dec->fmt_out.audio.i_channels, p_dec->fmt_out.audio.i_rate,
440 p_dec->fmt_out.audio.i_bitspersample );
442 p_sys->b_stream_info = true;
443 p_sys->stream_info = metadata->data.stream_info;
445 date_Init( &p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1 );
446 date_Set( &p_sys->end_date, VLC_TS_INVALID );
449 /*****************************************************************************
450 * DecoderErrorCallback: called when the libflac decoder encounters an error
451 *****************************************************************************/
452 static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder,
453 FLAC__StreamDecoderErrorStatus status,
457 decoder_t *p_dec = (decoder_t *)client_data;
461 case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC:
462 msg_Warn( p_dec, "an error in the stream caused the decoder to "
463 "lose synchronization." );
465 case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER:
466 msg_Err( p_dec, "the decoder encountered a corrupted frame header." );
468 case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH:
469 msg_Err( p_dec, "frame's data did not match the CRC in the "
473 msg_Err( p_dec, "got decoder error: %d", status );
476 FLAC__stream_decoder_flush( p_dec->p_sys->p_flac );
480 /*****************************************************************************
481 * Interleave: helper function to interleave channels
482 *****************************************************************************/
483 static void Interleave32( int32_t *p_out, const int32_t * const *pp_in,
484 const int pi_index[],
485 int i_nb_channels, int i_samples )
488 for ( j = 0; j < i_samples; j++ )
490 for ( i = 0; i < i_nb_channels; i++ )
492 p_out[j * i_nb_channels + i] = pp_in[pi_index[i]][j];
497 static void Interleave24( int8_t *p_out, const int32_t * const *pp_in,
498 const int pi_index[],
499 int i_nb_channels, int i_samples )
502 for ( j = 0; j < i_samples; j++ )
504 for ( i = 0; i < i_nb_channels; i++ )
506 const int i_index = pi_index[i];
507 #ifdef WORDS_BIGENDIAN
508 p_out[3*(j * i_nb_channels + i)+0] = (pp_in[i_index][j] >> 16) & 0xff;
509 p_out[3*(j * i_nb_channels + i)+1] = (pp_in[i_index][j] >> 8 ) & 0xff;
510 p_out[3*(j * i_nb_channels + i)+2] = (pp_in[i_index][j] >> 0 ) & 0xff;
512 p_out[3*(j * i_nb_channels + i)+2] = (pp_in[i_index][j] >> 16) & 0xff;
513 p_out[3*(j * i_nb_channels + i)+1] = (pp_in[i_index][j] >> 8 ) & 0xff;
514 p_out[3*(j * i_nb_channels + i)+0] = (pp_in[i_index][j] >> 0 ) & 0xff;
520 static void Interleave16( int16_t *p_out, const int32_t * const *pp_in,
521 const int pi_index[],
522 int i_nb_channels, int i_samples )
525 for ( j = 0; j < i_samples; j++ )
527 for ( i = 0; i < i_nb_channels; i++ )
529 p_out[j * i_nb_channels + i] = (int32_t)(pp_in[pi_index[i]][j]);
534 /*****************************************************************************
535 * decoder_state_error: print meaningful error messages
536 *****************************************************************************/
537 static void decoder_state_error( decoder_t *p_dec,
538 FLAC__StreamDecoderState state )
542 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
543 msg_Dbg( p_dec, "the decoder is ready to search for metadata." );
545 case FLAC__STREAM_DECODER_READ_METADATA:
546 msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
547 "reading metadata." );
549 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
550 msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
551 "searching for the frame sync code." );
553 case FLAC__STREAM_DECODER_READ_FRAME:
554 msg_Dbg( p_dec, "the decoder is ready to or is in the process of "
555 "reading a frame." );
557 case FLAC__STREAM_DECODER_END_OF_STREAM:
558 msg_Dbg( p_dec, "the decoder has reached the end of the stream." );
560 #ifdef USE_NEW_FLAC_API
561 case FLAC__STREAM_DECODER_OGG_ERROR:
562 msg_Err( p_dec, "error occurred in the Ogg layer." );
564 case FLAC__STREAM_DECODER_SEEK_ERROR:
565 msg_Err( p_dec, "error occurred while seeking." );
568 case FLAC__STREAM_DECODER_ABORTED:
569 msg_Warn( p_dec, "the decoder was aborted by the read callback." );
571 #ifndef USE_NEW_FLAC_API
572 case FLAC__STREAM_DECODER_UNPARSEABLE_STREAM:
573 msg_Warn( p_dec, "the decoder encountered reserved fields in use "
577 case FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
578 msg_Err( p_dec, "error when allocating memory." );
580 #ifndef USE_NEW_FLAC_API
581 case FLAC__STREAM_DECODER_ALREADY_INITIALIZED:
582 msg_Err( p_dec, "FLAC__stream_decoder_init() was called when the "
583 "decoder was already initialized, usually because "
584 "FLAC__stream_decoder_finish() was not called." );
586 case FLAC__STREAM_DECODER_INVALID_CALLBACK:
587 msg_Err( p_dec, "FLAC__stream_decoder_init() was called without "
588 "all callbacks being set." );
591 case FLAC__STREAM_DECODER_UNINITIALIZED:
592 msg_Err( p_dec, "decoder in uninitialized state." );
595 msg_Warn(p_dec, "unknown error" );
599 /*****************************************************************************
600 * encoder_sys_t : flac encoder descriptor
601 *****************************************************************************/
612 FLAC__int32 *p_buffer;
613 unsigned int i_buffer;
620 FLAC__StreamEncoder *p_flac;
621 FLAC__StreamMetadata_StreamInfo stream_info;
629 #define STREAMINFO_SIZE 38
631 static block_t *Encode( encoder_t *, aout_buffer_t * );
633 static FLAC__StreamEncoderWriteStatus
634 EncoderWriteCallback( const FLAC__StreamEncoder *encoder,
635 const FLAC__byte buffer[],
636 unsigned bytes, unsigned samples,
637 unsigned current_frame, void *client_data );
639 static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder,
640 const FLAC__StreamMetadata *metadata,
643 /*****************************************************************************
644 * OpenEncoder: probe the encoder and return score
645 *****************************************************************************/
646 static int OpenEncoder( vlc_object_t *p_this )
648 encoder_t *p_enc = (encoder_t *)p_this;
649 encoder_sys_t *p_sys;
651 if( p_enc->fmt_out.i_codec != VLC_CODEC_FLAC &&
657 /* Allocate the memory needed to store the decoder's structure */
658 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
660 p_enc->p_sys = p_sys;
661 p_enc->pf_encode_audio = Encode;
662 p_enc->fmt_out.i_codec = VLC_CODEC_FLAC;
664 p_sys->i_headers = 0;
667 p_sys->i_samples_delay = 0;
669 /* Create flac encoder */
670 if( !(p_sys->p_flac = FLAC__stream_encoder_new()) )
672 msg_Err( p_enc, "FLAC__stream_encoder_new() failed" );
677 FLAC__stream_encoder_set_streamable_subset( p_sys->p_flac, 1 );
678 FLAC__stream_encoder_set_channels( p_sys->p_flac,
679 p_enc->fmt_in.audio.i_channels );
680 FLAC__stream_encoder_set_sample_rate( p_sys->p_flac,
681 p_enc->fmt_in.audio.i_rate );
682 FLAC__stream_encoder_set_bits_per_sample( p_sys->p_flac, 16 );
683 p_enc->fmt_in.i_codec = VLC_CODEC_S16N;
685 /* Get and store the STREAMINFO metadata block as a p_extra */
688 #ifdef USE_NEW_FLAC_API
689 if( FLAC__stream_encoder_init_stream( p_sys->p_flac,
690 EncoderWriteCallback,
693 EncoderMetadataCallback,
695 != FLAC__STREAM_ENCODER_INIT_STATUS_OK )
697 msg_Err( p_enc, "FLAC__stream_encoder_init_stream() failed" );
698 FLAC__stream_encoder_delete( p_sys->p_flac );
703 FLAC__stream_encoder_set_write_callback( p_sys->p_flac,
704 EncoderWriteCallback );
705 FLAC__stream_encoder_set_metadata_callback( p_sys->p_flac,
706 EncoderMetadataCallback );
707 FLAC__stream_encoder_set_client_data( p_sys->p_flac, p_enc );
709 FLAC__stream_encoder_init( p_sys->p_flac );
715 /****************************************************************************
716 * Encode: the whole thing
717 ****************************************************************************
718 * This function spits out ogg packets.
719 ****************************************************************************/
720 static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
722 encoder_sys_t *p_sys = p_enc->p_sys;
726 p_sys->i_pts = p_aout_buf->i_pts -
727 (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay /
728 (mtime_t)p_enc->fmt_in.audio.i_rate;
730 p_sys->i_samples_delay += p_aout_buf->i_nb_samples;
732 /* Convert samples to FLAC__int32 */
733 if( p_sys->i_buffer < p_aout_buf->i_buffer * 2 )
736 xrealloc( p_sys->p_buffer, p_aout_buf->i_buffer * 2 );
737 p_sys->i_buffer = p_aout_buf->i_buffer * 2;
740 for( i = 0 ; i < p_aout_buf->i_buffer / 2 ; i++ )
742 p_sys->p_buffer[i]= ((int16_t *)p_aout_buf->p_buffer)[i];
745 FLAC__stream_encoder_process_interleaved( p_sys->p_flac, p_sys->p_buffer,
746 p_aout_buf->i_nb_samples );
748 p_chain = p_sys->p_chain;
754 /*****************************************************************************
755 * CloseEncoder: encoder destruction
756 *****************************************************************************/
757 static void CloseEncoder( vlc_object_t *p_this )
759 encoder_t *p_enc = (encoder_t *)p_this;
760 encoder_sys_t *p_sys = p_enc->p_sys;
762 FLAC__stream_encoder_delete( p_sys->p_flac );
764 free( p_sys->p_buffer );
768 /*****************************************************************************
769 * EncoderMetadataCallback: called by libflac to output metadata
770 *****************************************************************************/
771 static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder,
772 const FLAC__StreamMetadata *metadata,
776 encoder_t *p_enc = (encoder_t *)client_data;
778 msg_Err( p_enc, "MetadataCallback: %i", metadata->type );
782 /*****************************************************************************
783 * EncoderWriteCallback: called by libflac to output encoded samples
784 *****************************************************************************/
785 static FLAC__StreamEncoderWriteStatus
786 EncoderWriteCallback( const FLAC__StreamEncoder *encoder,
787 const FLAC__byte buffer[],
788 unsigned bytes, unsigned samples,
789 unsigned current_frame, void *client_data )
791 VLC_UNUSED(encoder); VLC_UNUSED(current_frame);
792 encoder_t *p_enc = (encoder_t *)client_data;
793 encoder_sys_t *p_sys = p_enc->p_sys;
798 if( p_sys->i_headers == 1 )
800 msg_Dbg( p_enc, "Writing STREAMINFO: %i", bytes );
802 /* Backup the STREAMINFO metadata block */
803 p_enc->fmt_out.i_extra = STREAMINFO_SIZE + 4;
804 p_enc->fmt_out.p_extra = xmalloc( STREAMINFO_SIZE + 4 );
805 memcpy( p_enc->fmt_out.p_extra, "fLaC", 4 );
806 memcpy( ((uint8_t *)p_enc->fmt_out.p_extra) + 4, buffer,
809 /* Fake this as the last metadata block */
810 ((uint8_t*)p_enc->fmt_out.p_extra)[4] |= 0x80;
813 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
816 p_block = block_New( p_enc, bytes );
817 memcpy( p_block->p_buffer, buffer, bytes );
819 p_block->i_dts = p_block->i_pts = p_sys->i_pts;
821 p_sys->i_samples_delay -= samples;
823 p_block->i_length = (mtime_t)1000000 *
824 (mtime_t)samples / (mtime_t)p_enc->fmt_in.audio.i_rate;
827 p_sys->i_pts += p_block->i_length;
829 block_ChainAppend( &p_sys->p_chain, p_block );
831 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;