1 /*****************************************************************************
2 * aiff.c: Audio Interchange File Format demuxer
3 *****************************************************************************
4 * Copyright (C) 2004-2007 the VideoLAN team
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_demux.h>
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Open ( vlc_object_t * );
43 static void Close ( vlc_object_t * );
46 set_category( CAT_INPUT );
47 set_subcategory( SUBCAT_INPUT_DEMUX );
48 set_description( _("AIFF demuxer" ) );
49 set_capability( "demux2", 10 );
50 set_callbacks( Open, Close );
51 add_shortcut( "aiff" );
54 /*****************************************************************************
56 *****************************************************************************/
77 static int Demux ( demux_t *p_demux );
78 static int Control( demux_t *p_demux, int i_query, va_list args );
80 /* GetF80BE: read a 80 bits float in big endian */
81 static unsigned int GetF80BE( const uint8_t p[10] )
83 unsigned int i_mantissa = GetDWBE( &p[2] );
84 int i_exp = 30 - p[1];
85 unsigned int i_last = 0;
99 /*****************************************************************************
101 *****************************************************************************/
102 static int Open( vlc_object_t *p_this )
104 demux_t *p_demux = (demux_t*)p_this;
107 const uint8_t *p_peek;
109 if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
111 if( memcmp( p_peek, "FORM", 4 )
112 || memcmp( &p_peek[8], "AIFF", 4 ) )
115 /* skip aiff header */
116 stream_Read( p_demux->s, NULL, 12 );
118 /* Fill p_demux field */
119 DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
120 es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
122 p_sys->i_ssnd_pos = -1;
128 CHECK_PEEK_GOTO( p_peek, 8 );
129 i_size = GetDWBE( &p_peek[4] );
131 msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
133 if( !memcmp( p_peek, "COMM", 4 ) )
135 CHECK_PEEK_GOTO( p_peek, 18+8 );
136 es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
137 p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
138 p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
139 p_sys->fmt.audio.i_rate = GetF80BE( &p_peek[16] );
141 msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
142 GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
144 else if( !memcmp( p_peek, "SSND", 4 ) )
146 CHECK_PEEK_GOTO( p_peek, 8+8 );
147 p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
148 p_sys->i_ssnd_size = i_size;
149 p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
150 p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
152 msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
153 p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
155 if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
157 /* We have found the 2 needed chunks */
161 /* Skip this chunk */
163 if( (i_size % 2) != 0 )
165 if( stream_Read( p_demux->s, NULL, i_size ) != (int)i_size )
167 msg_Warn( p_demux, "incomplete file" );
172 p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
173 p_sys->i_ssnd_end = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
175 p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
176 ((p_sys->fmt.audio.i_bitspersample + 7) / 8);
178 if( p_sys->i_ssnd_fsize <= 0 )
180 msg_Err( p_demux, "invalid audio parameters" );
184 if( p_sys->i_ssnd_size <= 0 )
187 p_sys->i_ssnd_end = 0;
190 /* seek into SSND chunk */
191 if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
193 msg_Err( p_demux, "cannot seek to data chunk" );
198 p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
207 /*****************************************************************************
209 *****************************************************************************/
210 static void Close( vlc_object_t *p_this )
212 demux_t *p_demux = (demux_t*)p_this;
213 demux_sys_t *p_sys = p_demux->p_sys;
219 /*****************************************************************************
221 *****************************************************************************/
222 static int Demux( demux_t *p_demux )
224 demux_sys_t *p_sys = p_demux->p_sys;
225 int64_t i_tell = stream_Tell( p_demux->s );
230 if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
237 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
239 /* we will read 100ms at once */
240 i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
241 if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
243 i_read = p_sys->i_ssnd_end - i_tell;
245 if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
251 p_block->i_pts = p_sys->i_time;
253 p_sys->i_time += (int64_t)1000000 *
255 p_sys->i_ssnd_fsize /
256 p_sys->fmt.audio.i_rate;
259 es_out_Send( p_demux->out, p_sys->es, p_block );
263 /*****************************************************************************
265 *****************************************************************************/
266 static int Control( demux_t *p_demux, int i_query, va_list args )
268 demux_sys_t *p_sys = p_demux->p_sys;
274 case DEMUX_GET_POSITION:
276 int64_t i_start = p_sys->i_ssnd_start;
277 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
278 int64_t i_tell = stream_Tell( p_demux->s );
280 pf = (double*) va_arg( args, double* );
282 if( i_start < i_end )
284 *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
290 case DEMUX_SET_POSITION:
292 int64_t i_start = p_sys->i_ssnd_start;
293 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
295 f = (double) va_arg( args, double );
297 if( i_start < i_end )
299 int i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
300 int64_t i_new = i_start + i_frame * p_sys->i_ssnd_fsize;
302 if( stream_Seek( p_demux->s, i_new ) )
306 p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
313 pi64 = (int64_t*)va_arg( args, int64_t * );
314 *pi64 = p_sys->i_time;
317 case DEMUX_GET_LENGTH:
319 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
321 pi64 = (int64_t*)va_arg( args, int64_t * );
322 if( p_sys->i_ssnd_start < i_end )
324 *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;