1 /*****************************************************************************
2 * mpga.c : MPEG-I/II Audio input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: mpga.c,v 1.4 2003/09/10 21:56:44 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 * );
60 int i_bitrate_avg; /* extracted from Xing header */
61 es_descriptor_t *p_es;
64 static int HeaderCheck( uint32_t h )
66 if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
67 || (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
68 || (((h >> 12)&0x0F) == 0x0F )
69 || (((h >> 12)&0x0F) == 0x00 ) /* valid bitrate ? */
70 || (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
71 || ((h & 0x03) == 0x02 )) /* valid emphasis ? */
78 static int mpga_sample_rate[2][4] =
80 { 44100, 48000, 32000, 0 },
81 { 22050, 24000, 16000, 0 }
84 static int mpga_bitrate[2][3][16] =
87 { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0},
88 { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0},
89 { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}
92 { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0},
93 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
94 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
99 #define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
100 #define MPGA_LAYER( h ) ( 3 - (((h)>>17)&0x03) )
101 #define MPGA_SAMPLE_RATE(h) \
102 ( mpga_sample_rate[MPGA_VERSION(h)][((h)>>10)&0x03] / ( ((h>>20)&0x01) ? 1 : 2) )
103 #define MPGA_CHANNELS(h) ( (((h)>>6)&0x03) == 3 ? 1 : 2)
104 #define MPGA_BITRATE(h) mpga_bitrate[MPGA_VERSION(h)][MPGA_LAYER(h)][((h)>>12)&0x0f]
105 #define MPGA_PADDING(h) ( ((h)>>9)&0x01 )
106 #define MPGA_MODE(h) (((h)>> 6)&0x03)
108 static int mpga_frame_size( uint32_t h )
110 switch( MPGA_LAYER(h) )
113 return ( ( 12000 * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h) ) * 4;
115 return ( 144000 * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h);
117 return ( ( MPGA_VERSION(h) ? 72000 : 144000 ) * MPGA_BITRATE(h) ) / MPGA_SAMPLE_RATE(h) + MPGA_PADDING(h);
123 static int mpga_frame_samples( uint32_t h )
125 switch( MPGA_LAYER(h) )
132 return MPGA_VERSION(h) ? 576 : 1152;
139 static int CheckPS( input_thread_t *p_input )
143 int i_size = input_Peek( p_input, &p_peek, 8196 );
147 if( ( p_peek[0] == 0 ) && ( p_peek[1] == 0 ) &&
148 ( p_peek[2] == 1 ) && ( p_peek[3] >= 0xb9 ) &&
161 /*****************************************************************************
162 * Open: initializes demux structures
163 *****************************************************************************/
164 static int Open( vlc_object_t * p_this )
166 input_thread_t *p_input = (input_thread_t *)p_this;
168 vlc_bool_t b_forced = VLC_FALSE;
169 vlc_bool_t b_extention = VLC_FALSE;
178 if( p_input->psz_demux &&
179 ( !strncmp( p_input->psz_demux, "mpga", 4 ) ||
180 !strncmp( p_input->psz_demux, "mp3", 3 ) ) )
184 if( p_input->psz_name )
186 int i_len = strlen( p_input->psz_name );
188 if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".mp3" ) )
190 b_extention = VLC_TRUE;
194 /* skip possible id3 header */
195 p_id3 = module_Need( p_input, "id3", NULL );
198 module_Unneed( p_input, p_id3 );
201 if( input_Peek( p_input, &p_peek, 4 ) < 4 )
203 msg_Err( p_input, "cannot peek" );
207 if( !HeaderCheck( header = GetDWBE( p_peek ) ) )
209 vlc_bool_t b_ok = VLC_FALSE;
212 if( !b_forced && !b_extention )
214 msg_Warn( p_input, "mpga module discarded" );
218 i_peek = input_Peek( p_input, &p_peek, 8096 );
222 if( HeaderCheck( header = GetDWBE( p_peek ) ) )
230 if( !b_ok && !b_forced )
232 msg_Warn( p_input, "mpga module discarded" );
237 p_input->pf_demux = Demux;
238 p_input->pf_demux_control = demux_vaControlDefault;
240 p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
242 p_sys->i_bitrate_avg = 0;
244 if( ( p_sys->s = stream_OpenInput( p_input ) ) == NULL )
246 msg_Err( p_input, "cannot create stream" );
250 if( HeaderCheck( header ) )
255 input_info_category_t * p_cat;
256 static char* mpga_mode[4] =
258 "stereo", "joint stereo", "dual channel", "mono"
261 p_sys->i_bitrate_avg = MPGA_BITRATE( header ) * 1000;
262 if( ( i_xing = stream_Peek( p_sys->s, &p_xing, 1024 ) ) >= 21 )
266 if( MPGA_VERSION( header) == 0 )
268 i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
272 i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
274 if( i_skip + 8 < i_xing &&
275 !strncmp( &p_xing[i_skip], "Xing", 4 ) )
277 unsigned int i_flags = GetDWBE( &p_xing[i_skip+4] );
278 unsigned int i_bytes = 0, i_frames = 0;
280 p_xing += i_skip + 8;
281 i_xing -= i_skip + 8;
284 if( i_flags&0x01 && i_skip + 4 <= i_xing ) /* XING_FRAMES */
286 i_frames = GetDWBE( &p_xing[i_skip] );
289 if( i_flags&0x02 && i_skip + 4 <= i_xing ) /* XING_BYTES */
291 i_bytes = GetDWBE( &p_xing[i_skip] );
294 if( i_flags&0x04 ) /* XING_TOC */
298 if( i_flags&0x08 && i_skip + 4 <= i_xing ) /* XING_VBR */
300 p_sys->i_bitrate_avg = GetDWBE( &p_xing[i_skip] );
301 msg_Dbg( p_input, "xing vbr value present (%d)", p_sys->i_bitrate_avg );
303 else if( i_frames > 0 && i_bytes > 0 )
305 p_sys->i_bitrate_avg = (int64_t)i_bytes *
307 (int64_t)MPGA_SAMPLE_RATE( header ) /
309 (int64_t)mpga_frame_samples( header );
310 msg_Dbg( p_input, "xing frames&bytes value present (%db/s)", p_sys->i_bitrate_avg );
315 msg_Dbg( p_input, "version=%d layer=%d channels=%d samplerate=%d",
316 MPGA_VERSION( header) + 1,
317 MPGA_LAYER( header ) + 1,
318 MPGA_CHANNELS( header ),
319 MPGA_SAMPLE_RATE( header ) );
321 vlc_mutex_lock( &p_input->stream.stream_lock );
323 p_cat = input_InfoCategory( p_input, _("MPEG") );
324 input_AddInfo( p_cat, _("Input Type"), "Audio MPEG-%d",
325 MPGA_VERSION( header) + 1 );
326 input_AddInfo( p_cat, _("Layer"), "%d",
327 MPGA_LAYER( header ) + 1 );
328 input_AddInfo( p_cat, _("Mode"),
329 mpga_mode[MPGA_MODE( header )] );
330 input_AddInfo( p_cat, _("Sample Rate"), "%dHz",
331 MPGA_SAMPLE_RATE( header ) );
332 input_AddInfo( p_cat, _("Average Bitrate"), "%dKb/s",
333 p_sys->i_bitrate_avg / 1000 );
334 vlc_mutex_unlock( &p_input->stream.stream_lock );
337 vlc_mutex_lock( &p_input->stream.stream_lock );
338 if( input_InitStream( p_input, 0 ) == -1)
340 vlc_mutex_unlock( &p_input->stream.stream_lock );
341 msg_Err( p_input, "cannot init stream" );
344 if( input_AddProgram( p_input, 0, 0) == NULL )
346 vlc_mutex_unlock( &p_input->stream.stream_lock );
347 msg_Err( p_input, "cannot add program" );
350 p_input->stream.pp_programs[0]->b_is_ok = 0;
351 p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
353 p_input->stream.i_mux_rate = p_sys->i_bitrate_avg / 8 / 50;
355 p_sys->p_es = input_AddES( p_input,
356 p_input->stream.p_selected_program,
357 1 , AUDIO_ES, NULL, 0 );
359 p_sys->p_es->i_stream_id = 1;
360 p_sys->p_es->i_fourcc = VLC_FOURCC( 'm', 'p', 'g', 'a' );
361 input_SelectES( p_input, p_sys->p_es );
363 p_input->stream.p_selected_program->b_is_ok = 1;
364 vlc_mutex_unlock( &p_input->stream.stream_lock );
371 stream_Release( p_sys->s );
378 /*****************************************************************************
379 * Demux: reads and demuxes data packets
380 *****************************************************************************
381 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
382 *****************************************************************************/
383 static int Demux( input_thread_t * p_input )
385 demux_sys_t *p_sys = p_input->p_demux_data;
391 if( stream_Peek( p_sys->s, &p_peek, 4 ) < 4 )
393 msg_Warn( p_input, "cannot peek" );
397 if( !HeaderCheck( header = GetDWBE( p_peek ) ) )
399 /* we need to resynch */
400 vlc_bool_t b_ok = VLC_FALSE;
404 i_peek = stream_Peek( p_sys->s, &p_peek, 8096 );
407 msg_Warn( p_input, "cannot peek" );
413 if( HeaderCheck( header = GetDWBE( p_peek ) ) )
424 msg_Warn( p_input, "garbage=%d bytes", i_skip );
425 stream_Read( p_sys->s, NULL, i_skip );
429 input_ClockManageRef( p_input,
430 p_input->stream.p_selected_program,
431 p_sys->i_time * 9 / 100 );
433 if( ( p_pes = stream_PesPacket( p_sys->s, mpga_frame_size( header ) ) ) == NULL )
435 msg_Warn( p_input, "cannot read data" );
440 p_pes->i_pts = input_ClockGetTS( p_input,
441 p_input->stream.p_selected_program,
442 p_sys->i_time * 9 / 100 );
444 if( !p_sys->p_es->p_decoder_fifo )
446 msg_Err( p_input, "no audio decoder" );
447 input_DeletePES( p_input->p_method_data, p_pes );
451 input_DecodePES( p_sys->p_es->p_decoder_fifo, p_pes );
452 p_sys->i_time += (mtime_t)1000000 *
453 (mtime_t)mpga_frame_samples( header ) /
454 (mtime_t)MPGA_SAMPLE_RATE( header );
458 /*****************************************************************************
459 * Close: frees unused data
460 *****************************************************************************/
461 static void Close( vlc_object_t * p_this )
463 input_thread_t *p_input = (input_thread_t*)p_this;
464 demux_sys_t *p_sys = p_input->p_demux_data;
468 stream_Release( p_sys->s );