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361 lines
12 KiB
361 lines
12 KiB
/*****************************************************************************
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* twolame.c: libtwolame encoder (MPEG-1/2 layer II) module
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* (using libtwolame from http://www.twolame.org/)
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*****************************************************************************
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* Copyright (C) 2004-2005 VLC authors and VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Gildas Bazin
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.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 *, block_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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"Force a specific encoding 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_( "Handling mode for stereo streams" )
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#define ENC_VBR_TEXT N_("VBR mode")
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#define ENC_VBR_LONGTEXT N_( \
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"Use Variable BitRate. Default is to use Constant BitRate (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 const int pi_stereo_values[] = { 0, 1, 2 };
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static const char *const 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( N_("Libtwolame audio encoder") )
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set_capability( "encoder", 120 )
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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, ENC_QUALITY_TEXT,
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ENC_QUALITY_LONGTEXT, false )
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add_integer( ENC_CFG_PREFIX "mode", 0, ENC_MODE_TEXT,
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ENC_MODE_LONGTEXT, false )
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change_integer_list( pi_stereo_values, ppsz_stereo_descriptions );
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add_bool( ENC_CFG_PREFIX "vbr", false, ENC_VBR_TEXT,
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ENC_VBR_LONGTEXT, false )
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add_integer( ENC_CFG_PREFIX "psy", 3, ENC_PSY_TEXT,
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ENC_PSY_LONGTEXT, false )
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vlc_module_end ()
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static const char *const 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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typedef struct
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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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vlc_tick_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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} encoder_sys_t;
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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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int i_frequency;
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if( p_enc->fmt_out.i_codec != VLC_CODEC_MP2 &&
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p_enc->fmt_out.i_codec != VLC_CODEC_MPGA &&
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p_enc->fmt_out.i_codec != VLC_FOURCC( 'm', 'p', '2', 'a' ) &&
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!p_enc->obj.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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return VLC_ENOMEM;
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p_enc->p_sys = p_sys;
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p_enc->fmt_in.i_codec = VLC_CODEC_S16N;
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p_enc->fmt_out.i_cat = AUDIO_ES;
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p_enc->fmt_out.i_codec = VLC_CODEC_MPGA;
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config_ChainParse( 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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if( var_GetBool( p_enc, ENC_CFG_PREFIX "vbr" ) )
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{
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float f_quality = var_GetFloat( p_enc, ENC_CFG_PREFIX "quality" );
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if ( f_quality > 50.f ) f_quality = 50.f;
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if ( f_quality < 0.f ) f_quality = 0.f;
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twolame_set_VBR( p_sys->p_twolame, 1 );
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twolame_set_VBR_q( p_sys->p_twolame, f_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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switch( var_GetInteger( p_enc, ENC_CFG_PREFIX "mode" ) )
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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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twolame_set_psymodel( p_sys->p_twolame,
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var_GetInteger( p_enc, ENC_CFG_PREFIX "psy" ) );
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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_enc->pf_encode_audio = Encode;
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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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encoder_sys_t *p_sys = p_enc->p_sys;
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const unsigned i_offset = p_sys->i_nb_samples * p_enc->fmt_in.audio.i_channels;
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const unsigned i_len = ARRAY_SIZE(p_sys->p_buffer);
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if( i_offset >= i_len )
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{
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msg_Err( p_enc, "buffer full" );
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return;
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}
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unsigned i_copy = i_nb_samples * p_enc->fmt_in.audio.i_channels;
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if( i_copy + i_offset > i_len)
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{
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msg_Err( p_enc, "dropping samples" );
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i_copy = i_len - i_offset;
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}
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memcpy( p_sys->p_buffer + i_offset, p_in, i_copy * sizeof(int16_t) );
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}
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static block_t *Encode( encoder_t *p_enc, block_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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block_t *p_chain = NULL;
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if( unlikely( !p_aout_buf ) ) {
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int i_used = 0;
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block_t *p_block;
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i_used = twolame_encode_flush( p_sys->p_twolame,
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p_sys->p_out_buffer, MAX_CODED_FRAME_SIZE );
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if( i_used <= 0 )
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return NULL;
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p_block = block_Alloc( i_used );
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if( !p_block )
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return NULL;
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memcpy( p_block->p_buffer, p_sys->p_out_buffer, i_used );
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p_block->i_length = vlc_tick_from_samples( MPEG_FRAME_SIZE,
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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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return p_block;
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}
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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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p_sys->i_pts = p_aout_buf->i_pts -
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vlc_tick_from_samples( p_sys->i_nb_samples,
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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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/* On error, buffer samples and return what was already encoded */
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if( i_used < 0 )
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{
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msg_Err( p_enc, "encoder error: %d", i_used );
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break;
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}
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p_sys->i_nb_samples = 0;
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p_block = block_Alloc( i_used );
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if( !p_block )
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{
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if( p_chain )
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block_ChainRelease( p_chain );
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return NULL;
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}
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memcpy( p_block->p_buffer, p_sys->p_out_buffer, i_used );
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p_block->i_length = vlc_tick_from_samples( MPEG_FRAME_SIZE,
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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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