1 /*****************************************************************************
2 * twolame.c: libtwolame encoder (MPEG-1/2 layer II) module
3 * (using libtwolame from http://users.tpg.com.au/adslblvi/)
4 *****************************************************************************
5 * Copyright (C) 2004-2005 the VideoLAN team
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-twolame-"
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." )
61 #define ENC_PSY_TEXT N_("Psycho-acoustic model")
62 #define ENC_PSY_LONGTEXT N_( \
63 "Integer from -1 (no model) to 4." )
66 set_shortname( "Twolame");
67 set_description( _("Libtwolame audio encoder") );
68 set_capability( "encoder", 50 );
69 set_callbacks( OpenEncoder, CloseEncoder );
70 set_category( CAT_INPUT );
71 set_subcategory( SUBCAT_INPUT_ACODEC );
73 add_float( ENC_CFG_PREFIX "quality", 0.0, NULL, ENC_QUALITY_TEXT,
74 ENC_QUALITY_LONGTEXT, VLC_FALSE );
75 add_integer( ENC_CFG_PREFIX "mode", 0, NULL, ENC_MODE_TEXT,
76 ENC_MODE_LONGTEXT, VLC_FALSE );
77 add_bool( ENC_CFG_PREFIX "vbr", 0, NULL, ENC_VBR_TEXT,
78 ENC_VBR_LONGTEXT, VLC_FALSE );
79 add_integer( ENC_CFG_PREFIX "psy", 3, NULL, ENC_PSY_TEXT,
80 ENC_PSY_LONGTEXT, VLC_FALSE );
83 static const char *ppsz_enc_options[] = {
84 "quality", "mode", "vbr", "psy", NULL
87 /*****************************************************************************
88 * encoder_sys_t : twolame encoder descriptor
89 *****************************************************************************/
95 int16_t p_buffer[MPEG_FRAME_SIZE * 2];
100 * libtwolame properties
102 twolame_options *p_twolame;
103 unsigned char p_out_buffer[MAX_CODED_FRAME_SIZE];
106 /*****************************************************************************
107 * OpenEncoder: probe the encoder and return score
108 *****************************************************************************/
109 static const uint16_t mpa_bitrate_tab[2][15] =
111 {0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384},
112 {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}
115 static const uint16_t mpa_freq_tab[6] =
116 { 44100, 48000, 32000, 22050, 24000, 16000 };
118 static int OpenEncoder( vlc_object_t *p_this )
120 encoder_t *p_enc = (encoder_t *)p_this;
121 encoder_sys_t *p_sys;
125 if( p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','g','a') &&
126 p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2','a') &&
127 p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2',' ') &&
133 if( p_enc->fmt_in.audio.i_channels > 2 )
135 msg_Err( p_enc, "doesn't support > 2 channels" );
139 for ( i_frequency = 0; i_frequency < 6; i_frequency++ )
141 if ( p_enc->fmt_out.audio.i_rate == mpa_freq_tab[i_frequency] )
144 if ( i_frequency == 6 )
146 msg_Err( p_enc, "MPEG audio doesn't support frequency=%d",
147 p_enc->fmt_out.audio.i_rate );
151 /* Allocate the memory needed to store the decoder's structure */
152 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
154 msg_Err( p_enc, "out of memory" );
157 p_enc->p_sys = p_sys;
159 p_enc->pf_encode_audio = Encode;
160 p_enc->fmt_in.i_codec = AOUT_FMT_S16_NE;
161 p_enc->fmt_out.i_codec = VLC_FOURCC('m','p','g','a');
163 sout_CfgParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
165 p_sys->p_twolame = twolame_init();
168 twolame_set_in_samplerate( p_sys->p_twolame, p_enc->fmt_out.audio.i_rate );
169 twolame_set_out_samplerate( p_sys->p_twolame, p_enc->fmt_out.audio.i_rate );
171 var_Get( p_enc, ENC_CFG_PREFIX "vbr", &val );
175 var_Get( p_enc, ENC_CFG_PREFIX "quality", &val );
176 i_quality = val.i_int;
177 if ( i_quality > 50.0 ) i_quality = 50.0;
178 if ( i_quality < 0.0 ) i_quality = 0.0;
179 twolame_set_VBR( p_sys->p_twolame, 1 );
180 twolame_set_VBR_q( p_sys->p_twolame, i_quality );
185 for ( i = 1; i < 14; i++ )
187 if ( p_enc->fmt_out.i_bitrate / 1000
188 <= mpa_bitrate_tab[i_frequency / 3][i] )
191 if ( p_enc->fmt_out.i_bitrate / 1000
192 != mpa_bitrate_tab[i_frequency / 3][i] )
194 msg_Warn( p_enc, "MPEG audio doesn't support bitrate=%d, using %d",
195 p_enc->fmt_out.i_bitrate,
196 mpa_bitrate_tab[i_frequency / 3][i] * 1000 );
197 p_enc->fmt_out.i_bitrate = mpa_bitrate_tab[i_frequency / 3][i]
201 twolame_set_bitrate( p_sys->p_twolame,
202 p_enc->fmt_out.i_bitrate / 1000 );
205 if ( p_enc->fmt_in.audio.i_channels == 1 )
207 twolame_set_num_channels( p_sys->p_twolame, 1 );
208 twolame_set_mode( p_sys->p_twolame, TWOLAME_MONO );
212 twolame_set_num_channels( p_sys->p_twolame, 2 );
213 var_Get( p_enc, ENC_CFG_PREFIX "mode", &val );
217 twolame_set_mode( p_sys->p_twolame, TWOLAME_DUAL_CHANNEL );
220 twolame_set_mode( p_sys->p_twolame, TWOLAME_JOINT_STEREO );
224 twolame_set_mode( p_sys->p_twolame, TWOLAME_STEREO );
229 var_Get( p_enc, ENC_CFG_PREFIX "psy", &val );
230 twolame_set_psymodel( p_sys->p_twolame, val.i_int );
232 if ( twolame_init_params( p_sys->p_twolame ) )
234 msg_Err( p_enc, "twolame initialization failed" );
235 return -VLC_EGENERIC;
238 p_sys->i_nb_samples = 0;
243 /****************************************************************************
244 * Encode: the whole thing
245 ****************************************************************************
246 * This function spits out MPEG packets.
247 ****************************************************************************/
248 static void Bufferize( encoder_t *p_enc, int16_t *p_in, int i_nb_samples )
250 int16_t *p_buffer = p_enc->p_sys->p_buffer
251 + (p_enc->p_sys->i_nb_samples
252 * p_enc->fmt_in.audio.i_channels);
254 memcpy( p_buffer, p_in, i_nb_samples * p_enc->fmt_in.audio.i_channels
258 static block_t *Encode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
260 encoder_sys_t *p_sys = p_enc->p_sys;
261 int16_t *p_buffer = (int16_t *)p_aout_buf->p_buffer;
262 int i_nb_samples = p_aout_buf->i_nb_samples;
263 block_t *p_chain = NULL;
265 p_sys->i_pts = p_aout_buf->start_date -
266 (mtime_t)1000000 * (mtime_t)p_sys->i_nb_samples /
267 (mtime_t)p_enc->fmt_out.audio.i_rate;
269 while ( p_sys->i_nb_samples + i_nb_samples >= MPEG_FRAME_SIZE )
274 Bufferize( p_enc, p_buffer, MPEG_FRAME_SIZE - p_sys->i_nb_samples );
275 i_nb_samples -= MPEG_FRAME_SIZE - p_sys->i_nb_samples;
276 p_buffer += (MPEG_FRAME_SIZE - p_sys->i_nb_samples) * 2;
278 i_used = twolame_encode_buffer_interleaved( p_sys->p_twolame,
279 p_sys->p_buffer, MPEG_FRAME_SIZE,
280 p_sys->p_out_buffer, MAX_CODED_FRAME_SIZE );
281 p_sys->i_nb_samples = 0;
282 p_block = block_New( p_enc, i_used );
283 p_enc->p_vlc->pf_memcpy( p_block->p_buffer, p_sys->p_out_buffer,
285 p_block->i_length = (mtime_t)1000000 *
286 (mtime_t)MPEG_FRAME_SIZE / (mtime_t)p_enc->fmt_out.audio.i_rate;
287 p_block->i_dts = p_block->i_pts = p_sys->i_pts;
288 p_sys->i_pts += p_block->i_length;
289 block_ChainAppend( &p_chain, p_block );
294 Bufferize( p_enc, p_buffer, i_nb_samples );
295 p_sys->i_nb_samples += i_nb_samples;
301 /*****************************************************************************
302 * CloseEncoder: twolame encoder destruction
303 *****************************************************************************/
304 static void CloseEncoder( vlc_object_t *p_this )
306 encoder_t *p_enc = (encoder_t *)p_this;
307 encoder_sys_t *p_sys = p_enc->p_sys;
309 twolame_close( &p_sys->p_twolame );