1 /*****************************************************************************
2 * toolame.c: libtoolame encoder (MPEG-1/2 layer II) module
3 * (using libtoolame from http://users.tpg.com.au/adslblvi/)
4 *****************************************************************************
5 * Copyright (C) 2004 VideoLAN
8 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
29 #include <vlc/decoder.h>
35 #define MPEG_FRAME_SIZE 1152
36 #define MAX_CODED_FRAME_SIZE 1792
38 /****************************************************************************
40 ****************************************************************************/
41 static int OpenEncoder ( vlc_object_t * );
42 static void CloseEncoder ( vlc_object_t * );
43 static block_t *Encode ( encoder_t *, aout_buffer_t * );
45 /*****************************************************************************
47 *****************************************************************************/
48 #define ENC_CFG_PREFIX "sout-toolame-"
50 #define ENC_QUALITY_TEXT N_("Encoding quality")
51 #define ENC_QUALITY_LONGTEXT N_( \
52 "Allows you to specify a quality between 0.0 (high) and 50.0 (low), " \
53 "instead of specifying a particular bitrate. " \
54 "This will produce a VBR stream." )
55 #define ENC_MODE_TEXT N_("Stereo mode")
56 #define ENC_MODE_LONGTEXT N_( \
57 "[0=stereo, 1=dual-mono, 2=joint-stereo]" )
58 #define ENC_VBR_TEXT N_("VBR mode")
59 #define ENC_VBR_LONGTEXT N_( \
60 "By default the encoding is CBR." )
63 set_description( _("libtoolame audio encoder") );
64 set_capability( "encoder", 50 );
65 set_callbacks( OpenEncoder, CloseEncoder );
66 set_category( CAT_INPUT );
67 set_subcategory( SUBCAT_INPUT_ACODEC );
69 add_float( ENC_CFG_PREFIX "quality", 0.0, NULL, ENC_QUALITY_TEXT,
70 ENC_QUALITY_LONGTEXT, VLC_FALSE );
71 add_integer( ENC_CFG_PREFIX "mode", 0, NULL, ENC_MODE_TEXT,
72 ENC_MODE_LONGTEXT, VLC_FALSE );
73 add_bool( ENC_CFG_PREFIX "vbr", 0, NULL, ENC_VBR_TEXT,
74 ENC_VBR_LONGTEXT, VLC_FALSE );
77 static const char *ppsz_enc_options[] = {
78 "quality", "mode", "vbr", NULL
81 /*****************************************************************************
82 * encoder_sys_t : toolame encoder descriptor
83 *****************************************************************************/
89 int16_t p_left[MPEG_FRAME_SIZE];
90 int16_t p_right[MPEG_FRAME_SIZE];
95 * libtoolame properties
97 toolame_options *p_toolame;
98 unsigned char p_out_buffer[MAX_CODED_FRAME_SIZE];
101 /*****************************************************************************
102 * OpenEncoder: probe the encoder and return score
103 *****************************************************************************/
104 static int OpenEncoder( vlc_object_t *p_this )
106 encoder_t *p_enc = (encoder_t *)p_this;
107 encoder_sys_t *p_sys;
110 if( p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','g','a') &&
111 p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2','a') &&
112 p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2',' ') &&
118 if( p_enc->fmt_in.audio.i_channels > 2 )
120 msg_Err( p_enc, "doesn't support > 2 channels" );
124 /* Allocate the memory needed to store the decoder's structure */
125 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
127 msg_Err( p_enc, "out of memory" );
130 p_enc->p_sys = p_sys;
132 p_enc->pf_encode_audio = Encode;
133 p_enc->fmt_in.i_codec = AOUT_FMT_S16_NE;
134 p_enc->fmt_out.i_codec = VLC_FOURCC('m','p','g','a');
136 sout_CfgParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
138 p_sys->p_toolame = toolame_init();
141 toolame_setSampleFreq( p_sys->p_toolame, p_enc->fmt_out.audio.i_rate );
143 var_Get( p_enc, ENC_CFG_PREFIX "vbr", &val );
147 var_Get( p_enc, ENC_CFG_PREFIX "quality", &val );
148 i_quality = val.i_int;
149 if ( i_quality > 50.0 ) i_quality = 50.0;
150 if ( i_quality < 0.0 ) i_quality = 0.0;
151 toolame_setVBR( p_sys->p_toolame, 1 );
152 toolame_setVBRLevel( p_sys->p_toolame, i_quality );
156 toolame_setBitrate( p_sys->p_toolame, p_enc->fmt_out.i_bitrate / 1000 );
159 if ( p_enc->fmt_in.audio.i_channels == 1 )
161 toolame_setMode( p_sys->p_toolame, MPG_MD_MONO );
165 var_Get( p_enc, ENC_CFG_PREFIX "mode", &val );
169 toolame_setMode( p_sys->p_toolame, MPG_MD_DUAL_CHANNEL );
172 toolame_setMode( p_sys->p_toolame, MPG_MD_JOINT_STEREO );
176 toolame_setMode( p_sys->p_toolame, MPG_MD_STEREO );
181 if ( toolame_init_params( p_sys->p_toolame ) )
183 msg_Err( p_enc, "toolame initialization failed" );
184 return -VLC_EGENERIC;
187 p_sys->i_nb_samples = 0;
188 aout_DateInit( &p_sys->pts, p_enc->fmt_out.audio.i_rate );
193 /****************************************************************************
194 * Encode: the whole thing
195 ****************************************************************************
196 * This function spits out MPEG packets.
197 ****************************************************************************/
198 static void Uninterleave( encoder_t *p_enc, int16_t *p_in, int i_nb_samples )
200 int16_t *p_left = p_enc->p_sys->p_left + p_enc->p_sys->i_nb_samples;
201 int16_t *p_right = p_enc->p_sys->p_right + p_enc->p_sys->i_nb_samples;
203 while ( i_nb_samples > 0 )
206 *p_right++ = *p_in++;
211 static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
213 encoder_sys_t *p_sys = p_enc->p_sys;
214 int16_t *p_buffer = (int16_t *)p_aout_buf->p_buffer;
215 int i_nb_samples = p_aout_buf->i_nb_samples;
216 block_t *p_chain = NULL;
217 mtime_t i_computed_pts = p_aout_buf->start_date -
218 (mtime_t)1000000 * (mtime_t)p_sys->i_nb_samples /
219 (mtime_t)p_enc->fmt_in.audio.i_rate;
221 if ( aout_DateGet( &p_sys->pts ) - i_computed_pts > 10000 ||
222 aout_DateGet( &p_sys->pts ) - i_computed_pts < -10000 )
224 msg_Dbg( p_enc, "resetting audio date" );
225 aout_DateSet( &p_sys->pts, i_computed_pts );
228 while ( p_sys->i_nb_samples + i_nb_samples >= MPEG_FRAME_SIZE )
233 Uninterleave( p_enc, p_buffer, MPEG_FRAME_SIZE - p_sys->i_nb_samples );
234 i_nb_samples -= MPEG_FRAME_SIZE - p_sys->i_nb_samples;
235 p_buffer += (MPEG_FRAME_SIZE - p_sys->i_nb_samples) * 2;
237 toolame_encode_buffer( p_sys->p_toolame, p_sys->p_left,
238 p_sys->p_right, MPEG_FRAME_SIZE,
239 p_sys->p_out_buffer, MAX_CODED_FRAME_SIZE,
241 p_sys->i_nb_samples = 0;
242 p_block = block_New( p_enc, i_used );
243 p_enc->p_vlc->pf_memcpy( p_block->p_buffer, p_sys->p_out_buffer,
245 p_block->i_length = (mtime_t)1000000 *
246 (mtime_t)MPEG_FRAME_SIZE / (mtime_t)p_enc->fmt_in.audio.i_rate;
247 p_block->i_dts = p_block->i_pts = aout_DateGet( &p_sys->pts );
248 aout_DateIncrement( &p_sys->pts, MPEG_FRAME_SIZE );
249 block_ChainAppend( &p_chain, p_block );
254 Uninterleave( p_enc, p_buffer, i_nb_samples );
255 p_sys->i_nb_samples += i_nb_samples;
261 /*****************************************************************************
262 * CloseEncoder: toolame encoder destruction
263 *****************************************************************************/
264 static void CloseEncoder( vlc_object_t *p_this )
266 encoder_t *p_enc = (encoder_t *)p_this;
267 encoder_sys_t *p_sys = p_enc->p_sys;
269 toolame_deinit( p_sys->p_toolame );