/***************************************************************************** * flac.c: flac decoder/encoder module making use of libflac ***************************************************************************** * Copyright (C) 1999-2001 the VideoLAN team * $Id$ * * Authors: Gildas Bazin * Sigmund Augdal Helberg * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #include #include #if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT >= 8 # define USE_NEW_FLAC_API #endif /***************************************************************************** * decoder_sys_t : FLAC decoder descriptor *****************************************************************************/ struct decoder_sys_t { /* * Input/Output properties */ block_t *p_block; aout_buffer_t *p_aout_buffer; date_t end_date; /* * FLAC properties */ FLAC__StreamDecoder *p_flac; FLAC__StreamMetadata_StreamInfo stream_info; bool b_stream_info; }; static const int pi_channels_maps[9] = { 0, AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE }; /***************************************************************************** * Local prototypes *****************************************************************************/ static int OpenDecoder ( vlc_object_t * ); static void CloseDecoder ( vlc_object_t * ); static int OpenEncoder ( vlc_object_t * ); static void CloseEncoder ( vlc_object_t * ); static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** ); static FLAC__StreamDecoderReadStatus DecoderReadCallback( const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data ); static FLAC__StreamDecoderWriteStatus DecoderWriteCallback( const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const buffer[], void *client_data ); static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data ); static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); static void Interleave32( int32_t *p_out, const int32_t * const *pp_in, const int *pi_order, int i_nb_channels, int i_samples ); static void Interleave24( int8_t *p_out, const int32_t * const *pp_in, const int *pi_order, int i_nb_channels, int i_samples ); static void Interleave16( int16_t *p_out, const int32_t * const *pp_in, const int *pi_order, int i_nb_channels, int i_samples ); static void decoder_state_error( decoder_t *p_dec, FLAC__StreamDecoderState state ); /***************************************************************************** * Module descriptor *****************************************************************************/ vlc_module_begin () set_category( CAT_INPUT ) set_subcategory( SUBCAT_INPUT_ACODEC ) add_shortcut( "flac" ) set_description( N_("Flac audio decoder") ) set_capability( "decoder", 100 ) set_callbacks( OpenDecoder, CloseDecoder ) add_submodule () add_shortcut( "flac" ) set_description( N_("Flac audio encoder") ) set_capability( "encoder", 100 ) set_callbacks( OpenEncoder, CloseEncoder ) vlc_module_end () /***************************************************************************** * OpenDecoder: probe the decoder and return score *****************************************************************************/ static int OpenDecoder( vlc_object_t *p_this ) { decoder_t *p_dec = (decoder_t*)p_this; decoder_sys_t *p_sys; if( p_dec->fmt_in.i_codec != VLC_CODEC_FLAC ) { return VLC_EGENERIC; } /* Allocate the memory needed to store the decoder's structure */ if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL ) return VLC_ENOMEM; /* Misc init */ p_sys->b_stream_info = false; p_sys->p_block = NULL; /* Take care of flac init */ if( !(p_sys->p_flac = FLAC__stream_decoder_new()) ) { msg_Err( p_dec, "FLAC__stream_decoder_new() failed" ); free( p_sys ); return VLC_EGENERIC; } #ifdef USE_NEW_FLAC_API if( FLAC__stream_decoder_init_stream( p_sys->p_flac, DecoderReadCallback, NULL, NULL, NULL, NULL, DecoderWriteCallback, DecoderMetadataCallback, DecoderErrorCallback, p_dec ) != FLAC__STREAM_DECODER_INIT_STATUS_OK ) { msg_Err( p_dec, "FLAC__stream_decoder_init_stream() failed" ); FLAC__stream_decoder_delete( p_sys->p_flac ); free( p_sys ); return VLC_EGENERIC; } #else FLAC__stream_decoder_set_read_callback( p_sys->p_flac, DecoderReadCallback ); FLAC__stream_decoder_set_write_callback( p_sys->p_flac, DecoderWriteCallback ); FLAC__stream_decoder_set_metadata_callback( p_sys->p_flac, DecoderMetadataCallback ); FLAC__stream_decoder_set_error_callback( p_sys->p_flac, DecoderErrorCallback ); FLAC__stream_decoder_set_client_data( p_sys->p_flac, p_dec ); FLAC__stream_decoder_init( p_sys->p_flac ); #endif /* Set output properties */ p_dec->fmt_out.i_cat = AUDIO_ES; p_dec->fmt_out.i_codec = VLC_CODEC_FL32; /* Set callbacks */ p_dec->pf_decode_audio = DecodeBlock; /* */ p_dec->b_need_packetized = true; return VLC_SUCCESS; } /***************************************************************************** * CloseDecoder: flac decoder destruction *****************************************************************************/ static void CloseDecoder( vlc_object_t *p_this ) { decoder_t *p_dec = (decoder_t *)p_this; decoder_sys_t *p_sys = p_dec->p_sys; FLAC__stream_decoder_finish( p_sys->p_flac ); FLAC__stream_decoder_delete( p_sys->p_flac ); if( p_sys->p_block ) block_Release( p_sys->p_block ); free( p_sys ); } /***************************************************************************** * ProcessHeader: process Flac header. *****************************************************************************/ static void ProcessHeader( decoder_t *p_dec ) { decoder_sys_t *p_sys = p_dec->p_sys; if( !p_dec->fmt_in.i_extra ) return; /* Decode STREAMINFO */ msg_Dbg( p_dec, "decode STREAMINFO" ); p_sys->p_block = block_New( p_dec, p_dec->fmt_in.i_extra ); memcpy( p_sys->p_block->p_buffer, p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra ); FLAC__stream_decoder_process_until_end_of_metadata( p_sys->p_flac ); msg_Dbg( p_dec, "STREAMINFO decoded" ); } /**************************************************************************** * DecodeBlock: the whole thing ****************************************************************************/ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block ) { decoder_sys_t *p_sys = p_dec->p_sys; if( !pp_block || !*pp_block ) return NULL; if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) ) { block_Release( *pp_block ); return NULL; } if( !p_sys->b_stream_info ) ProcessHeader( p_dec ); p_sys->p_block = *pp_block; *pp_block = NULL; if( p_sys->p_block->i_pts > VLC_TS_INVALID && p_sys->p_block->i_pts != date_Get( &p_sys->end_date ) ) date_Set( &p_sys->end_date, p_sys->p_block->i_pts ); p_sys->p_aout_buffer = 0; if( !FLAC__stream_decoder_process_single( p_sys->p_flac ) ) { decoder_state_error( p_dec, FLAC__stream_decoder_get_state( p_sys->p_flac ) ); FLAC__stream_decoder_flush( p_dec->p_sys->p_flac ); } /* If the decoder is in the "aborted" state, * FLAC__stream_decoder_process_single() won't return an error. */ if( FLAC__stream_decoder_get_state(p_dec->p_sys->p_flac) == FLAC__STREAM_DECODER_ABORTED ) { FLAC__stream_decoder_flush( p_dec->p_sys->p_flac ); } block_Release( p_sys->p_block ); p_sys->p_block = NULL; return p_sys->p_aout_buffer; } /***************************************************************************** * DecoderReadCallback: called by libflac when it needs more data *****************************************************************************/ static FLAC__StreamDecoderReadStatus DecoderReadCallback( const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data ) { VLC_UNUSED(decoder); decoder_t *p_dec = (decoder_t *)client_data; decoder_sys_t *p_sys = p_dec->p_sys; if( p_sys->p_block && p_sys->p_block->i_buffer ) { *bytes = __MIN(*bytes, (unsigned)p_sys->p_block->i_buffer); memcpy( buffer, p_sys->p_block->p_buffer, *bytes ); p_sys->p_block->i_buffer -= *bytes; p_sys->p_block->p_buffer += *bytes; } else { *bytes = 0; return FLAC__STREAM_DECODER_READ_STATUS_ABORT; } return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; } /***************************************************************************** * DecoderWriteCallback: called by libflac to output decoded samples *****************************************************************************/ static FLAC__StreamDecoderWriteStatus DecoderWriteCallback( const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const buffer[], void *client_data ) { /* XXX it supposes our internal format is WG4 */ static const int ppi_reorder[1+8][8] = { {-1}, { 0, }, { 0, 1 }, { 0, 1, 2 }, { 0, 1, 2, 3 }, { 0, 1, 3, 4, 2 }, { 0, 1, 4, 5, 2, 3 }, { 0, 1, 6, 4, 5, 2, 3 }, /* 7.0 Unspecified by flac, but following SMPTE */ { 0, 1, 6, 7, 4, 5, 2, 3 }, /* 7.1 Unspecified by flac, but following SMPTE */ }; VLC_UNUSED(decoder); decoder_t *p_dec = (decoder_t *)client_data; decoder_sys_t *p_sys = p_dec->p_sys; if( p_dec->fmt_out.audio.i_channels <= 0 || p_dec->fmt_out.audio.i_channels > 8 ) return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; if( date_Get( &p_sys->end_date ) <= VLC_TS_INVALID ) return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; const int * const pi_reorder = ppi_reorder[p_dec->fmt_out.audio.i_channels]; p_sys->p_aout_buffer = decoder_NewAudioBuffer( p_dec, frame->header.blocksize ); if( p_sys->p_aout_buffer == NULL ) return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; switch( frame->header.bits_per_sample ) { case 16: Interleave16( (int16_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder, frame->header.channels, frame->header.blocksize ); break; case 24: Interleave24( (int8_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder, frame->header.channels, frame->header.blocksize ); break; default: Interleave32( (int32_t *)p_sys->p_aout_buffer->p_buffer, buffer, pi_reorder, frame->header.channels, frame->header.blocksize ); } /* Date management (already done by packetizer) */ p_sys->p_aout_buffer->i_pts = date_Get( &p_sys->end_date ); p_sys->p_aout_buffer->i_length = date_Increment( &p_sys->end_date, frame->header.blocksize ) - p_sys->p_aout_buffer->i_pts; return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; } /***************************************************************************** * DecoderMetadataCallback: called by libflac to when it encounters metadata *****************************************************************************/ static void DecoderMetadataCallback( const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data ) { VLC_UNUSED(decoder); decoder_t *p_dec = (decoder_t *)client_data; decoder_sys_t *p_sys = p_dec->p_sys; if( p_dec->pf_decode_audio ) { switch( metadata->data.stream_info.bits_per_sample ) { case 8: p_dec->fmt_out.i_codec = VLC_CODEC_S8; break; case 16: p_dec->fmt_out.i_codec = VLC_CODEC_S16N; break; case 24: p_dec->fmt_out.i_codec = VLC_CODEC_S24N; break; default: msg_Dbg( p_dec, "strange bit/sample value: %d", metadata->data.stream_info.bits_per_sample ); p_dec->fmt_out.i_codec = VLC_CODEC_FI32; break; } } /* Setup the format */ p_dec->fmt_out.audio.i_rate = metadata->data.stream_info.sample_rate; p_dec->fmt_out.audio.i_channels = metadata->data.stream_info.channels; p_dec->fmt_out.audio.i_physical_channels = p_dec->fmt_out.audio.i_original_channels = pi_channels_maps[metadata->data.stream_info.channels]; p_dec->fmt_out.audio.i_bitspersample = metadata->data.stream_info.bits_per_sample; msg_Dbg( p_dec, "channels:%d samplerate:%d bitspersamples:%d", p_dec->fmt_out.audio.i_channels, p_dec->fmt_out.audio.i_rate, p_dec->fmt_out.audio.i_bitspersample ); p_sys->b_stream_info = true; p_sys->stream_info = metadata->data.stream_info; date_Init( &p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1 ); date_Set( &p_sys->end_date, VLC_TS_INVALID ); } /***************************************************************************** * DecoderErrorCallback: called when the libflac decoder encounters an error *****************************************************************************/ static void DecoderErrorCallback( const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data ) { VLC_UNUSED(decoder); decoder_t *p_dec = (decoder_t *)client_data; switch( status ) { case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC: msg_Warn( p_dec, "an error in the stream caused the decoder to " "lose synchronization." ); break; case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER: msg_Err( p_dec, "the decoder encountered a corrupted frame header." ); break; case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH: msg_Err( p_dec, "frame's data did not match the CRC in the " "footer." ); break; default: msg_Err( p_dec, "got decoder error: %d", status ); } FLAC__stream_decoder_flush( p_dec->p_sys->p_flac ); return; } /***************************************************************************** * Interleave: helper function to interleave channels *****************************************************************************/ static void Interleave32( int32_t *p_out, const int32_t * const *pp_in, const int pi_index[], int i_nb_channels, int i_samples ) { int i, j; for ( j = 0; j < i_samples; j++ ) { for ( i = 0; i < i_nb_channels; i++ ) { p_out[j * i_nb_channels + i] = pp_in[pi_index[i]][j]; } } } static void Interleave24( int8_t *p_out, const int32_t * const *pp_in, const int pi_index[], int i_nb_channels, int i_samples ) { int i, j; for ( j = 0; j < i_samples; j++ ) { for ( i = 0; i < i_nb_channels; i++ ) { const int i_index = pi_index[i]; #ifdef WORDS_BIGENDIAN p_out[3*(j * i_nb_channels + i)+0] = (pp_in[i_index][j] >> 16) & 0xff; p_out[3*(j * i_nb_channels + i)+1] = (pp_in[i_index][j] >> 8 ) & 0xff; p_out[3*(j * i_nb_channels + i)+2] = (pp_in[i_index][j] >> 0 ) & 0xff; #else p_out[3*(j * i_nb_channels + i)+2] = (pp_in[i_index][j] >> 16) & 0xff; p_out[3*(j * i_nb_channels + i)+1] = (pp_in[i_index][j] >> 8 ) & 0xff; p_out[3*(j * i_nb_channels + i)+0] = (pp_in[i_index][j] >> 0 ) & 0xff; #endif } } } static void Interleave16( int16_t *p_out, const int32_t * const *pp_in, const int pi_index[], int i_nb_channels, int i_samples ) { int i, j; for ( j = 0; j < i_samples; j++ ) { for ( i = 0; i < i_nb_channels; i++ ) { p_out[j * i_nb_channels + i] = (int32_t)(pp_in[pi_index[i]][j]); } } } /***************************************************************************** * decoder_state_error: print meaningful error messages *****************************************************************************/ static void decoder_state_error( decoder_t *p_dec, FLAC__StreamDecoderState state ) { switch ( state ) { case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: msg_Dbg( p_dec, "the decoder is ready to search for metadata." ); break; case FLAC__STREAM_DECODER_READ_METADATA: msg_Dbg( p_dec, "the decoder is ready to or is in the process of " "reading metadata." ); break; case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: msg_Dbg( p_dec, "the decoder is ready to or is in the process of " "searching for the frame sync code." ); break; case FLAC__STREAM_DECODER_READ_FRAME: msg_Dbg( p_dec, "the decoder is ready to or is in the process of " "reading a frame." ); break; case FLAC__STREAM_DECODER_END_OF_STREAM: msg_Dbg( p_dec, "the decoder has reached the end of the stream." ); break; #ifdef USE_NEW_FLAC_API case FLAC__STREAM_DECODER_OGG_ERROR: msg_Err( p_dec, "error occurred in the Ogg layer." ); break; case FLAC__STREAM_DECODER_SEEK_ERROR: msg_Err( p_dec, "error occurred while seeking." ); break; #endif case FLAC__STREAM_DECODER_ABORTED: msg_Warn( p_dec, "the decoder was aborted by the read callback." ); break; #ifndef USE_NEW_FLAC_API case FLAC__STREAM_DECODER_UNPARSEABLE_STREAM: msg_Warn( p_dec, "the decoder encountered reserved fields in use " "in the stream." ); break; #endif case FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR: msg_Err( p_dec, "error when allocating memory." ); break; #ifndef USE_NEW_FLAC_API case FLAC__STREAM_DECODER_ALREADY_INITIALIZED: msg_Err( p_dec, "FLAC__stream_decoder_init() was called when the " "decoder was already initialized, usually because " "FLAC__stream_decoder_finish() was not called." ); break; case FLAC__STREAM_DECODER_INVALID_CALLBACK: msg_Err( p_dec, "FLAC__stream_decoder_init() was called without " "all callbacks being set." ); break; #endif case FLAC__STREAM_DECODER_UNINITIALIZED: msg_Err( p_dec, "decoder in uninitialized state." ); break; default: msg_Warn(p_dec, "unknown error" ); } } /***************************************************************************** * encoder_sys_t : flac encoder descriptor *****************************************************************************/ struct encoder_sys_t { /* * Input properties */ int i_headers; int i_samples_delay; int i_channels; FLAC__int32 *p_buffer; unsigned int i_buffer; block_t *p_chain; /* * FLAC properties */ FLAC__StreamEncoder *p_flac; FLAC__StreamMetadata_StreamInfo stream_info; /* * Common properties */ mtime_t i_pts; }; #define STREAMINFO_SIZE 38 static block_t *Encode( encoder_t *, aout_buffer_t * ); static FLAC__StreamEncoderWriteStatus EncoderWriteCallback( const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data ); static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data ); /***************************************************************************** * OpenEncoder: probe the encoder and return score *****************************************************************************/ static int OpenEncoder( vlc_object_t *p_this ) { encoder_t *p_enc = (encoder_t *)p_this; encoder_sys_t *p_sys; if( p_enc->fmt_out.i_codec != VLC_CODEC_FLAC && !p_enc->b_force ) { return VLC_EGENERIC; } /* Allocate the memory needed to store the decoder's structure */ if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL ) return VLC_ENOMEM; p_enc->p_sys = p_sys; p_enc->pf_encode_audio = Encode; p_enc->fmt_out.i_codec = VLC_CODEC_FLAC; p_sys->i_headers = 0; p_sys->p_buffer = 0; p_sys->i_buffer = 0; p_sys->i_samples_delay = 0; /* Create flac encoder */ if( !(p_sys->p_flac = FLAC__stream_encoder_new()) ) { msg_Err( p_enc, "FLAC__stream_encoder_new() failed" ); free( p_sys ); return VLC_EGENERIC; } FLAC__stream_encoder_set_streamable_subset( p_sys->p_flac, 1 ); FLAC__stream_encoder_set_channels( p_sys->p_flac, p_enc->fmt_in.audio.i_channels ); FLAC__stream_encoder_set_sample_rate( p_sys->p_flac, p_enc->fmt_in.audio.i_rate ); FLAC__stream_encoder_set_bits_per_sample( p_sys->p_flac, 16 ); p_enc->fmt_in.i_codec = VLC_CODEC_S16N; /* Get and store the STREAMINFO metadata block as a p_extra */ p_sys->p_chain = 0; #ifdef USE_NEW_FLAC_API if( FLAC__stream_encoder_init_stream( p_sys->p_flac, EncoderWriteCallback, NULL, NULL, EncoderMetadataCallback, p_enc ) != FLAC__STREAM_ENCODER_INIT_STATUS_OK ) { msg_Err( p_enc, "FLAC__stream_encoder_init_stream() failed" ); FLAC__stream_encoder_delete( p_sys->p_flac ); free( p_sys ); return VLC_EGENERIC; } #else FLAC__stream_encoder_set_write_callback( p_sys->p_flac, EncoderWriteCallback ); FLAC__stream_encoder_set_metadata_callback( p_sys->p_flac, EncoderMetadataCallback ); FLAC__stream_encoder_set_client_data( p_sys->p_flac, p_enc ); FLAC__stream_encoder_init( p_sys->p_flac ); #endif return VLC_SUCCESS; } /**************************************************************************** * Encode: the whole thing **************************************************************************** * This function spits out ogg packets. ****************************************************************************/ static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf ) { encoder_sys_t *p_sys = p_enc->p_sys; block_t *p_chain; unsigned int i; p_sys->i_pts = p_aout_buf->i_pts - (mtime_t)1000000 * (mtime_t)p_sys->i_samples_delay / (mtime_t)p_enc->fmt_in.audio.i_rate; p_sys->i_samples_delay += p_aout_buf->i_nb_samples; /* Convert samples to FLAC__int32 */ if( p_sys->i_buffer < p_aout_buf->i_buffer * 2 ) { p_sys->p_buffer = xrealloc( p_sys->p_buffer, p_aout_buf->i_buffer * 2 ); p_sys->i_buffer = p_aout_buf->i_buffer * 2; } for( i = 0 ; i < p_aout_buf->i_buffer / 2 ; i++ ) { p_sys->p_buffer[i]= ((int16_t *)p_aout_buf->p_buffer)[i]; } FLAC__stream_encoder_process_interleaved( p_sys->p_flac, p_sys->p_buffer, p_aout_buf->i_nb_samples ); p_chain = p_sys->p_chain; p_sys->p_chain = 0; return p_chain; } /***************************************************************************** * CloseEncoder: encoder destruction *****************************************************************************/ static void CloseEncoder( vlc_object_t *p_this ) { encoder_t *p_enc = (encoder_t *)p_this; encoder_sys_t *p_sys = p_enc->p_sys; FLAC__stream_encoder_delete( p_sys->p_flac ); free( p_sys->p_buffer ); free( p_sys ); } /***************************************************************************** * EncoderMetadataCallback: called by libflac to output metadata *****************************************************************************/ static void EncoderMetadataCallback( const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data ) { VLC_UNUSED(encoder); encoder_t *p_enc = (encoder_t *)client_data; msg_Err( p_enc, "MetadataCallback: %i", metadata->type ); return; } /***************************************************************************** * EncoderWriteCallback: called by libflac to output encoded samples *****************************************************************************/ static FLAC__StreamEncoderWriteStatus EncoderWriteCallback( const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data ) { VLC_UNUSED(encoder); VLC_UNUSED(current_frame); encoder_t *p_enc = (encoder_t *)client_data; encoder_sys_t *p_sys = p_enc->p_sys; block_t *p_block; if( samples == 0 ) { if( p_sys->i_headers == 1 ) { msg_Dbg( p_enc, "Writing STREAMINFO: %i", bytes ); /* Backup the STREAMINFO metadata block */ p_enc->fmt_out.i_extra = STREAMINFO_SIZE + 4; p_enc->fmt_out.p_extra = xmalloc( STREAMINFO_SIZE + 4 ); memcpy( p_enc->fmt_out.p_extra, "fLaC", 4 ); memcpy( ((uint8_t *)p_enc->fmt_out.p_extra) + 4, buffer, STREAMINFO_SIZE ); /* Fake this as the last metadata block */ ((uint8_t*)p_enc->fmt_out.p_extra)[4] |= 0x80; } p_sys->i_headers++; return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; } p_block = block_New( p_enc, bytes ); memcpy( p_block->p_buffer, buffer, bytes ); p_block->i_dts = p_block->i_pts = p_sys->i_pts; p_sys->i_samples_delay -= samples; p_block->i_length = (mtime_t)1000000 * (mtime_t)samples / (mtime_t)p_enc->fmt_in.audio.i_rate; /* Update pts */ p_sys->i_pts += p_block->i_length; block_ChainAppend( &p_sys->p_chain, p_block ); return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; }