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317 lines
11 KiB
317 lines
11 KiB
/*****************************************************************************
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* twolame.c: libtwolame encoder (MPEG-1/2 layer II) module
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* (using libtwolame from http://users.tpg.com.au/adslblvi/)
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*****************************************************************************
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* Copyright (C) 2004-2005 the VideoLAN team
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* $Id$
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <vlc/vlc.h>
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#include <vlc/decoder.h>
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#include <vlc/sout.h>
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#include <vlc/aout.h>
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#include <twolame.h>
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#define MPEG_FRAME_SIZE 1152
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#define MAX_CODED_FRAME_SIZE 1792
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/****************************************************************************
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* Local prototypes
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****************************************************************************/
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static int OpenEncoder ( vlc_object_t * );
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static void CloseEncoder ( vlc_object_t * );
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static block_t *Encode ( encoder_t *, aout_buffer_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define ENC_CFG_PREFIX "sout-twolame-"
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#define ENC_QUALITY_TEXT N_("Encoding quality")
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#define ENC_QUALITY_LONGTEXT N_( \
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"Allows you to specify a quality between 0.0 (high) and 50.0 (low), " \
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"instead of specifying a particular bitrate. " \
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"This will produce a VBR stream." )
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#define ENC_MODE_TEXT N_("Stereo mode")
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#define ENC_MODE_LONGTEXT N_( "Select how stereo streams will be handled" )
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#define ENC_VBR_TEXT N_("VBR mode")
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#define ENC_VBR_LONGTEXT N_( \
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"By default the encoding is CBR." )
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#define ENC_PSY_TEXT N_("Psycho-acoustic model")
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#define ENC_PSY_LONGTEXT N_( \
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"Integer from -1 (no model) to 4." )
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static int pi_stereo_values[] = { 0, 1, 2 };
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static char *ppsz_stereo_descriptions[] =
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{ N_("Stereo"), N_("Dual mono"), N_("Joint stereo") };
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vlc_module_begin();
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set_shortname( "Twolame");
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set_description( _("Libtwolame audio encoder") );
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set_capability( "encoder", 50 );
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set_callbacks( OpenEncoder, CloseEncoder );
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_ACODEC );
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add_float( ENC_CFG_PREFIX "quality", 0.0, NULL, ENC_QUALITY_TEXT,
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ENC_QUALITY_LONGTEXT, VLC_FALSE );
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add_integer( ENC_CFG_PREFIX "mode", 0, NULL, ENC_MODE_TEXT,
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ENC_MODE_LONGTEXT, VLC_FALSE );
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change_integer_list( pi_stereo_values, ppsz_stereo_descriptions, 0 );
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add_bool( ENC_CFG_PREFIX "vbr", 0, NULL, ENC_VBR_TEXT,
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ENC_VBR_LONGTEXT, VLC_FALSE );
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add_integer( ENC_CFG_PREFIX "psy", 3, NULL, ENC_PSY_TEXT,
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ENC_PSY_LONGTEXT, VLC_FALSE );
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vlc_module_end();
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static const char *ppsz_enc_options[] = {
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"quality", "mode", "vbr", "psy", NULL
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};
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/*****************************************************************************
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* encoder_sys_t : twolame encoder descriptor
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*****************************************************************************/
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struct encoder_sys_t
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{
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/*
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* Input properties
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*/
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int16_t p_buffer[MPEG_FRAME_SIZE * 2];
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int i_nb_samples;
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mtime_t i_pts;
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/*
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* libtwolame properties
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*/
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twolame_options *p_twolame;
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unsigned char p_out_buffer[MAX_CODED_FRAME_SIZE];
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};
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/*****************************************************************************
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* OpenEncoder: probe the encoder and return score
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*****************************************************************************/
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static const uint16_t mpa_bitrate_tab[2][15] =
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{
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{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384},
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}
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};
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static const uint16_t mpa_freq_tab[6] =
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{ 44100, 48000, 32000, 22050, 24000, 16000 };
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static int OpenEncoder( vlc_object_t *p_this )
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{
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encoder_t *p_enc = (encoder_t *)p_this;
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encoder_sys_t *p_sys;
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vlc_value_t val;
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int i_frequency;
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if( p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','g','a') &&
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p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2','a') &&
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p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2',' ') &&
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!p_enc->b_force )
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{
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return VLC_EGENERIC;
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}
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if( p_enc->fmt_in.audio.i_channels > 2 )
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{
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msg_Err( p_enc, "doesn't support > 2 channels" );
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return VLC_EGENERIC;
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}
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for ( i_frequency = 0; i_frequency < 6; i_frequency++ )
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{
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if ( p_enc->fmt_out.audio.i_rate == mpa_freq_tab[i_frequency] )
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break;
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}
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if ( i_frequency == 6 )
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{
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msg_Err( p_enc, "MPEG audio doesn't support frequency=%d",
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p_enc->fmt_out.audio.i_rate );
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return VLC_EGENERIC;
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}
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/* Allocate the memory needed to store the decoder's structure */
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if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
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{
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msg_Err( p_enc, "out of memory" );
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return VLC_EGENERIC;
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}
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p_enc->p_sys = p_sys;
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p_enc->pf_encode_audio = Encode;
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p_enc->fmt_in.i_codec = AOUT_FMT_S16_NE;
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p_enc->fmt_out.i_codec = VLC_FOURCC('m','p','g','a');
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sout_CfgParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
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p_sys->p_twolame = twolame_init();
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/* Set options */
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twolame_set_in_samplerate( p_sys->p_twolame, p_enc->fmt_out.audio.i_rate );
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twolame_set_out_samplerate( p_sys->p_twolame, p_enc->fmt_out.audio.i_rate );
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var_Get( p_enc, ENC_CFG_PREFIX "vbr", &val );
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if ( val.b_bool )
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{
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float i_quality;
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var_Get( p_enc, ENC_CFG_PREFIX "quality", &val );
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i_quality = val.i_int;
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if ( i_quality > 50.0 ) i_quality = 50.0;
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if ( i_quality < 0.0 ) i_quality = 0.0;
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twolame_set_VBR( p_sys->p_twolame, 1 );
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twolame_set_VBR_q( p_sys->p_twolame, i_quality );
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}
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else
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{
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int i;
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for ( i = 1; i < 14; i++ )
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{
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if ( p_enc->fmt_out.i_bitrate / 1000
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<= mpa_bitrate_tab[i_frequency / 3][i] )
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break;
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}
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if ( p_enc->fmt_out.i_bitrate / 1000
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!= mpa_bitrate_tab[i_frequency / 3][i] )
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{
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msg_Warn( p_enc, "MPEG audio doesn't support bitrate=%d, using %d",
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p_enc->fmt_out.i_bitrate,
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mpa_bitrate_tab[i_frequency / 3][i] * 1000 );
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p_enc->fmt_out.i_bitrate = mpa_bitrate_tab[i_frequency / 3][i]
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* 1000;
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}
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twolame_set_bitrate( p_sys->p_twolame,
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p_enc->fmt_out.i_bitrate / 1000 );
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}
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if ( p_enc->fmt_in.audio.i_channels == 1 )
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{
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twolame_set_num_channels( p_sys->p_twolame, 1 );
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twolame_set_mode( p_sys->p_twolame, TWOLAME_MONO );
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}
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else
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{
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twolame_set_num_channels( p_sys->p_twolame, 2 );
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var_Get( p_enc, ENC_CFG_PREFIX "mode", &val );
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switch ( val.i_int )
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{
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case 1:
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twolame_set_mode( p_sys->p_twolame, TWOLAME_DUAL_CHANNEL );
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break;
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case 2:
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twolame_set_mode( p_sys->p_twolame, TWOLAME_JOINT_STEREO );
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break;
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case 0:
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default:
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twolame_set_mode( p_sys->p_twolame, TWOLAME_STEREO );
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break;
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}
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}
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var_Get( p_enc, ENC_CFG_PREFIX "psy", &val );
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twolame_set_psymodel( p_sys->p_twolame, val.i_int );
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if ( twolame_init_params( p_sys->p_twolame ) )
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{
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msg_Err( p_enc, "twolame initialization failed" );
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return -VLC_EGENERIC;
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}
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p_sys->i_nb_samples = 0;
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return VLC_SUCCESS;
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}
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/****************************************************************************
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* Encode: the whole thing
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****************************************************************************
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* This function spits out MPEG packets.
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****************************************************************************/
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static void Bufferize( encoder_t *p_enc, int16_t *p_in, int i_nb_samples )
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{
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int16_t *p_buffer = p_enc->p_sys->p_buffer
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+ (p_enc->p_sys->i_nb_samples
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* p_enc->fmt_in.audio.i_channels);
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memcpy( p_buffer, p_in, i_nb_samples * p_enc->fmt_in.audio.i_channels
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* sizeof(int16_t) );
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}
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static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
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{
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encoder_sys_t *p_sys = p_enc->p_sys;
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int16_t *p_buffer = (int16_t *)p_aout_buf->p_buffer;
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int i_nb_samples = p_aout_buf->i_nb_samples;
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block_t *p_chain = NULL;
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p_sys->i_pts = p_aout_buf->start_date -
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(mtime_t)1000000 * (mtime_t)p_sys->i_nb_samples /
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(mtime_t)p_enc->fmt_out.audio.i_rate;
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while ( p_sys->i_nb_samples + i_nb_samples >= MPEG_FRAME_SIZE )
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{
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int i_used;
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block_t *p_block;
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Bufferize( p_enc, p_buffer, MPEG_FRAME_SIZE - p_sys->i_nb_samples );
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i_nb_samples -= MPEG_FRAME_SIZE - p_sys->i_nb_samples;
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p_buffer += (MPEG_FRAME_SIZE - p_sys->i_nb_samples) * 2;
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i_used = twolame_encode_buffer_interleaved( p_sys->p_twolame,
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p_sys->p_buffer, MPEG_FRAME_SIZE,
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p_sys->p_out_buffer, MAX_CODED_FRAME_SIZE );
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p_sys->i_nb_samples = 0;
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p_block = block_New( p_enc, i_used );
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p_enc->p_vlc->pf_memcpy( p_block->p_buffer, p_sys->p_out_buffer,
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i_used );
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p_block->i_length = (mtime_t)1000000 *
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(mtime_t)MPEG_FRAME_SIZE / (mtime_t)p_enc->fmt_out.audio.i_rate;
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p_block->i_dts = p_block->i_pts = p_sys->i_pts;
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p_sys->i_pts += p_block->i_length;
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block_ChainAppend( &p_chain, p_block );
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}
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if ( i_nb_samples )
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{
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Bufferize( p_enc, p_buffer, i_nb_samples );
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p_sys->i_nb_samples += i_nb_samples;
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}
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return p_chain;
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}
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/*****************************************************************************
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* CloseEncoder: twolame encoder destruction
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*****************************************************************************/
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static void CloseEncoder( vlc_object_t *p_this )
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{
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encoder_t *p_enc = (encoder_t *)p_this;
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encoder_sys_t *p_sys = p_enc->p_sys;
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twolame_close( &p_sys->p_twolame );
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free( p_sys );
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}
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