1 /*****************************************************************************
2 * mpga.c : MPEG-I/II Audio input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: mpga.c,v 1.6 2003/09/13 17:42:16 fenrir Exp $
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc/input.h>
32 /*****************************************************************************
34 *****************************************************************************/
35 static int Open ( vlc_object_t * );
36 static void Close ( vlc_object_t * );
39 set_description( _("MPEG-I/II Audio demuxer" ) );
40 set_capability( "demux", 100 );
41 set_callbacks( Open, Close );
42 add_shortcut( "mpga" );
43 add_shortcut( "mp3" );
50 /*****************************************************************************
52 *****************************************************************************/
53 static int Demux ( input_thread_t * );
59 int i_bitrate_avg; /* extracted from Xing header */
62 //es_descriptor_t *p_es;
65 static int HeaderCheck( uint32_t h )
67 if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
68 || (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
69 || (((h >> 12)&0x0F) == 0x0F )
70 || (((h >> 12)&0x0F) == 0x00 ) /* valid bitrate ? */
71 || (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
72 || ((h & 0x03) == 0x02 )) /* valid emphasis ? */
79 static int mpga_sample_rate[2][4] =
81 { 44100, 48000, 32000, 0 },
82 { 22050, 24000, 16000, 0 }
85 static int mpga_bitrate[2][3][16] =
88 { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0},
89 { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0},
90 { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}
93 { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0},
94 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
95 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
100 #define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
101 #define MPGA_LAYER( h ) ( 3 - (((h)>>17)&0x03) )
102 #define MPGA_SAMPLE_RATE(h) \
103 ( mpga_sample_rate[MPGA_VERSION(h)][((h)>>10)&0x03] / ( ((h>>20)&0x01) ? 1 : 2) )
104 #define MPGA_CHANNELS(h) ( (((h)>>6)&0x03) == 3 ? 1 : 2)
105 #define MPGA_BITRATE(h) mpga_bitrate[MPGA_VERSION(h)][MPGA_LAYER(h)][((h)>>12)&0x0f]
106 #define MPGA_PADDING(h) ( ((h)>>9)&0x01 )
107 #define MPGA_MODE(h) (((h)>> 6)&0x03)
109 static int mpga_frame_size( uint32_t h )
111 switch( MPGA_LAYER(h) )
114 return ( ( 12000 * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h) ) * 4;
116 return ( 144000 * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h);
118 return ( ( MPGA_VERSION(h) ? 72000 : 144000 ) * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h);
124 static int mpga_frame_samples( uint32_t h )
126 switch( MPGA_LAYER(h) )
133 return MPGA_VERSION(h) ? 576 : 1152;
140 static int CheckPS( input_thread_t *p_input )
144 int i_size = input_Peek( p_input, &p_peek, 8196 );
148 if( ( p_peek[0] == 0 ) && ( p_peek[1] == 0 ) &&
149 ( p_peek[2] == 1 ) && ( p_peek[3] >= 0xb9 ) &&
162 /*****************************************************************************
163 * Open: initializes demux structures
164 *****************************************************************************/
165 static int Open( vlc_object_t * p_this )
167 input_thread_t *p_input = (input_thread_t *)p_this;
169 vlc_bool_t b_forced = VLC_FALSE;
170 vlc_bool_t b_extention = VLC_FALSE;
181 if( p_input->psz_demux &&
182 ( !strncmp( p_input->psz_demux, "mpga", 4 ) ||
183 !strncmp( p_input->psz_demux, "mp3", 3 ) ) )
187 if( p_input->psz_name )
189 int i_len = strlen( p_input->psz_name );
191 if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".mp3" ) )
193 b_extention = VLC_TRUE;
197 /* skip possible id3 header */
198 p_id3 = module_Need( p_input, "id3", NULL );
201 module_Unneed( p_input, p_id3 );
204 if( input_Peek( p_input, &p_peek, 4 ) < 4 )
206 msg_Err( p_input, "cannot peek" );
210 if( !HeaderCheck( header = GetDWBE( p_peek ) ) )
212 vlc_bool_t b_ok = VLC_FALSE;
215 if( !b_forced && !b_extention )
217 msg_Warn( p_input, "mpga module discarded" );
221 i_peek = input_Peek( p_input, &p_peek, 8096 );
225 if( HeaderCheck( header = GetDWBE( p_peek ) ) )
233 if( !b_ok && !b_forced )
235 msg_Warn( p_input, "mpga module discarded" );
240 p_input->pf_demux = Demux;
241 p_input->pf_demux_control = demux_vaControlDefault;
243 p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
245 p_sys->i_bitrate_avg = 0;
247 if( HeaderCheck( header ) )
252 input_info_category_t * p_cat;
253 static char* mpga_mode[4] =
255 "stereo", "joint stereo", "dual channel", "mono"
258 p_sys->i_bitrate_avg = MPGA_BITRATE( header ) * 1000;
259 if( ( i_xing = stream_Peek( p_input->s, &p_xing, 1024 ) ) >= 21 )
263 if( MPGA_VERSION( header) == 0 )
265 i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
269 i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
271 if( i_skip + 8 < i_xing &&
272 !strncmp( &p_xing[i_skip], "Xing", 4 ) )
274 unsigned int i_flags = GetDWBE( &p_xing[i_skip+4] );
275 unsigned int i_bytes = 0, i_frames = 0;
277 p_xing += i_skip + 8;
278 i_xing -= i_skip + 8;
281 if( i_flags&0x01 && i_skip + 4 <= i_xing ) /* XING_FRAMES */
283 i_frames = GetDWBE( &p_xing[i_skip] );
286 if( i_flags&0x02 && i_skip + 4 <= i_xing ) /* XING_BYTES */
288 i_bytes = GetDWBE( &p_xing[i_skip] );
291 if( i_flags&0x04 ) /* XING_TOC */
295 if( i_flags&0x08 && i_skip + 4 <= i_xing ) /* XING_VBR */
297 p_sys->i_bitrate_avg = GetDWBE( &p_xing[i_skip] );
298 msg_Dbg( p_input, "xing vbr value present (%d)", p_sys->i_bitrate_avg );
300 else if( i_frames > 0 && i_bytes > 0 )
302 p_sys->i_bitrate_avg = (int64_t)i_bytes *
304 (int64_t)MPGA_SAMPLE_RATE( header ) /
306 (int64_t)mpga_frame_samples( header );
307 msg_Dbg( p_input, "xing frames&bytes value present (%db/s)", p_sys->i_bitrate_avg );
312 msg_Dbg( p_input, "version=%d layer=%d channels=%d samplerate=%d",
313 MPGA_VERSION( header) + 1,
314 MPGA_LAYER( header ) + 1,
315 MPGA_CHANNELS( header ),
316 MPGA_SAMPLE_RATE( header ) );
318 vlc_mutex_lock( &p_input->stream.stream_lock );
320 p_cat = input_InfoCategory( p_input, _("MPEG") );
321 input_AddInfo( p_cat, _("Input Type"), "Audio MPEG-%d",
322 MPGA_VERSION( header) + 1 );
323 input_AddInfo( p_cat, _("Layer"), "%d",
324 MPGA_LAYER( header ) + 1 );
325 input_AddInfo( p_cat, _("Mode"),
326 mpga_mode[MPGA_MODE( header )] );
327 input_AddInfo( p_cat, _("Sample Rate"), "%dHz",
328 MPGA_SAMPLE_RATE( header ) );
329 input_AddInfo( p_cat, _("Average Bitrate"), "%dKb/s",
330 p_sys->i_bitrate_avg / 1000 );
331 vlc_mutex_unlock( &p_input->stream.stream_lock );
334 vlc_mutex_lock( &p_input->stream.stream_lock );
335 if( input_InitStream( p_input, 0 ) == -1)
337 vlc_mutex_unlock( &p_input->stream.stream_lock );
338 msg_Err( p_input, "cannot init stream" );
341 p_input->stream.i_mux_rate = p_sys->i_bitrate_avg / 8 / 50;
342 vlc_mutex_unlock( &p_input->stream.stream_lock );
344 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
345 p_sys->p_es = es_out_Add( p_input->p_es_out, &fmt );
354 /*****************************************************************************
355 * Demux: reads and demuxes data packets
356 *****************************************************************************
357 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
358 *****************************************************************************/
359 static int Demux( input_thread_t * p_input )
361 demux_sys_t *p_sys = p_input->p_demux_data;
367 if( stream_Peek( p_input->s, &p_peek, 4 ) < 4 )
369 msg_Warn( p_input, "cannot peek" );
373 if( !HeaderCheck( header = GetDWBE( p_peek ) ) )
375 /* we need to resynch */
376 vlc_bool_t b_ok = VLC_FALSE;
380 i_peek = stream_Peek( p_input->s, &p_peek, 8096 );
383 msg_Warn( p_input, "cannot peek" );
389 if( HeaderCheck( header = GetDWBE( p_peek ) ) )
400 msg_Warn( p_input, "garbage=%d bytes", i_skip );
401 stream_Read( p_input->s, NULL, i_skip );
405 input_ClockManageRef( p_input,
406 p_input->stream.p_selected_program,
407 p_sys->i_time * 9 / 100 );
409 if( ( p_pes = stream_PesPacket( p_input->s, mpga_frame_size( header ) ) )
412 msg_Warn( p_input, "cannot read data" );
417 p_pes->i_pts = input_ClockGetTS( p_input,
418 p_input->stream.p_selected_program,
419 p_sys->i_time * 9 / 100 );
421 es_out_Send( p_input->p_es_out, p_sys->p_es, p_pes );
423 p_sys->i_time += (mtime_t)1000000 *
424 (mtime_t)mpga_frame_samples( header ) /
425 (mtime_t)MPGA_SAMPLE_RATE( header );
429 /*****************************************************************************
430 * Close: frees unused data
431 *****************************************************************************/
432 static void Close( vlc_object_t * p_this )
434 input_thread_t *p_input = (input_thread_t*)p_this;
435 demux_sys_t *p_sys = p_input->p_demux_data;