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 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Open ( vlc_object_t * );
44 static void Close ( vlc_object_t * );
47 set_category( CAT_INPUT );
48 set_subcategory( SUBCAT_INPUT_DEMUX );
49 set_description( N_("AIFF demuxer" ) );
50 set_capability( "demux", 10 );
51 set_callbacks( Open, Close );
52 add_shortcut( "aiff" );
55 /*****************************************************************************
57 *****************************************************************************/
78 static int Demux ( demux_t *p_demux );
79 static int Control( demux_t *p_demux, int i_query, va_list args );
81 /* GetF80BE: read a 80 bits float in big endian */
82 static unsigned int GetF80BE( const uint8_t p[10] )
84 unsigned int i_mantissa = GetDWBE( &p[2] );
85 int i_exp = 30 - p[1];
86 unsigned int i_last = 0;
100 /*****************************************************************************
102 *****************************************************************************/
103 static int Open( vlc_object_t *p_this )
105 demux_t *p_demux = (demux_t*)p_this;
108 const uint8_t *p_peek;
110 if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
112 if( memcmp( p_peek, "FORM", 4 )
113 || memcmp( &p_peek[8], "AIFF", 4 ) )
116 /* skip aiff header */
117 stream_Read( p_demux->s, NULL, 12 );
119 /* Fill p_demux field */
120 DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
121 es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
123 p_sys->i_ssnd_pos = -1;
129 CHECK_PEEK_GOTO( p_peek, 8 );
130 i_size = GetDWBE( &p_peek[4] );
132 msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
134 if( !memcmp( p_peek, "COMM", 4 ) )
136 CHECK_PEEK_GOTO( p_peek, 18+8 );
137 es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
138 p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
139 p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
140 p_sys->fmt.audio.i_rate = GetF80BE( &p_peek[16] );
142 msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
143 GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
145 else if( !memcmp( p_peek, "SSND", 4 ) )
147 CHECK_PEEK_GOTO( p_peek, 8+8 );
148 p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
149 p_sys->i_ssnd_size = i_size;
150 p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
151 p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
153 msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
154 p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
156 if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
158 /* We have found the 2 needed chunks */
162 /* Skip this chunk */
164 if( (i_size % 2) != 0 )
166 if( stream_Read( p_demux->s, NULL, i_size ) != (int)i_size )
168 msg_Warn( p_demux, "incomplete file" );
173 p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
174 p_sys->i_ssnd_end = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
176 p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
177 ((p_sys->fmt.audio.i_bitspersample + 7) / 8);
179 if( p_sys->i_ssnd_fsize <= 0 )
181 msg_Err( p_demux, "invalid audio parameters" );
185 if( p_sys->i_ssnd_size <= 0 )
188 p_sys->i_ssnd_end = 0;
191 /* seek into SSND chunk */
192 if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
194 msg_Err( p_demux, "cannot seek to data chunk" );
199 p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
208 /*****************************************************************************
210 *****************************************************************************/
211 static void Close( vlc_object_t *p_this )
213 demux_t *p_demux = (demux_t*)p_this;
214 demux_sys_t *p_sys = p_demux->p_sys;
220 /*****************************************************************************
222 *****************************************************************************/
223 static int Demux( demux_t *p_demux )
225 demux_sys_t *p_sys = p_demux->p_sys;
226 int64_t i_tell = stream_Tell( p_demux->s );
231 if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
238 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
240 /* we will read 100ms at once */
241 i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
242 if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
244 i_read = p_sys->i_ssnd_end - i_tell;
246 if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
252 p_block->i_pts = p_sys->i_time;
254 p_sys->i_time += (int64_t)1000000 *
256 p_sys->i_ssnd_fsize /
257 p_sys->fmt.audio.i_rate;
260 es_out_Send( p_demux->out, p_sys->es, p_block );
264 /*****************************************************************************
266 *****************************************************************************/
267 static int Control( demux_t *p_demux, int i_query, va_list args )
269 demux_sys_t *p_sys = p_demux->p_sys;
275 case DEMUX_GET_POSITION:
277 int64_t i_start = p_sys->i_ssnd_start;
278 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
279 int64_t i_tell = stream_Tell( p_demux->s );
281 pf = (double*) va_arg( args, double* );
283 if( i_start < i_end )
285 *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
291 case DEMUX_SET_POSITION:
293 int64_t i_start = p_sys->i_ssnd_start;
294 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
296 f = (double) va_arg( args, double );
298 if( i_start < i_end )
300 int i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
301 int64_t i_new = i_start + i_frame * p_sys->i_ssnd_fsize;
303 if( stream_Seek( p_demux->s, i_new ) )
307 p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
314 pi64 = (int64_t*)va_arg( args, int64_t * );
315 *pi64 = p_sys->i_time;
318 case DEMUX_GET_LENGTH:
320 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
322 pi64 = (int64_t*)va_arg( args, int64_t * );
323 if( p_sys->i_ssnd_start < i_end )
325 *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;