1 /*****************************************************************************
2 * aiff.c: Audio Interchange File Format demuxer
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN
5 * $Id: aiff.c,v 1.1 2004/01/28 12:25:37 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>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Open ( vlc_object_t * );
40 static void Close ( vlc_object_t * );
43 set_description( _("AIFF demuxer" ) );
44 set_capability( "demux2", 10 );
45 set_callbacks( Open, Close );
46 add_shortcut( "aiff" );
49 /*****************************************************************************
51 *****************************************************************************/
72 static int Demux ( demux_t *p_demux );
73 static int Control( demux_t *p_demux, int i_query, va_list args );
75 /* GetF80BE: read a 80 bits float in big endian */
76 static unsigned int GetF80BE( uint8_t p[10] )
78 unsigned int i_mantissa = GetDWBE( &p[2] );
79 int i_exp = 30 - p[1];
80 unsigned int i_last = 0;
94 /*****************************************************************************
96 *****************************************************************************/
97 static int Open( vlc_object_t *p_this )
99 demux_t *p_demux = (demux_t*)p_this;
104 if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
106 msg_Err( p_demux, "cannot peek" );
109 if( strncmp( &p_peek[0], "FORM", 4 ) || strncmp( &p_peek[8], "AIFF", 4 ) )
111 msg_Warn( p_demux, "AIFF module discarded" );
115 /* skip aiff header */
116 stream_Read( p_demux->s, NULL, 12 );
118 /* Fill p_demux field */
119 p_demux->pf_demux = Demux;
120 p_demux->pf_control = Control;
121 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
123 es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
125 p_sys->i_ssnd_pos = -1;
131 if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
133 msg_Dbg( p_demux, "cannot peek()" );
136 i_size = GetDWBE( &p_peek[4] );
138 msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
140 if( !strncmp( &p_peek[0], "COMM", 4 ) )
142 if( stream_Peek( p_demux->s, &p_peek, 18 + 8 ) < 18 + 8 )
144 msg_Dbg( p_demux, "cannot peek()" );
147 es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
148 p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
149 p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
150 p_sys->fmt.audio.i_rate = GetF80BE( &p_peek[16] );
152 msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
153 GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
155 else if( !strncmp( &p_peek[0], "SSND", 4 ) )
157 if( stream_Peek( p_demux->s, &p_peek, 8 + 8 ) < 8 + 8 )
159 msg_Dbg( p_demux, "cannot peek()" );
163 p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
164 p_sys->i_ssnd_size= i_size;
165 p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
166 p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
168 msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
169 p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
171 if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
173 /* We have found the 2 needed chunks */
177 /* Skip this chunk */
178 if( stream_Read( p_demux->s, NULL, i_size + 8 ) != i_size + 8 )
180 msg_Warn( p_demux, "incomplete file" );
185 p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
186 p_sys->i_ssnd_end = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
188 p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
189 ( p_sys->fmt.audio.i_bitspersample + 7 ) / 8;
191 if( p_sys->i_ssnd_fsize <= 0 )
193 msg_Err( p_demux, "invalid audio parameters" );
197 if( p_sys->i_ssnd_size <= 0 )
200 p_sys->i_ssnd_end = 0;
203 /* seek into SSND chunk */
204 if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
206 msg_Err( p_demux, "cannot seek to data chunk" );
211 p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
220 /*****************************************************************************
222 *****************************************************************************/
223 static void Close( vlc_object_t *p_this )
225 demux_t *p_demux = (demux_t*)p_this;
226 demux_sys_t *p_sys = p_demux->p_sys;
232 /*****************************************************************************
234 *****************************************************************************/
235 static int Demux( demux_t *p_demux )
237 demux_sys_t *p_sys = p_demux->p_sys;
238 int64_t i_tell = stream_Tell( p_demux->s );
243 if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
250 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
252 /* we will read 100ms at once */
253 i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
254 if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
256 i_read = p_sys->i_ssnd_end - i_tell;
258 if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
264 p_block->i_pts = p_sys->i_time;
266 p_sys->i_time += (int64_t)1000000 *
268 p_sys->i_ssnd_fsize /
269 p_sys->fmt.audio.i_rate;
272 es_out_Send( p_demux->out, p_sys->es, p_block );
276 /*****************************************************************************
278 *****************************************************************************/
279 static int Control( demux_t *p_demux, int i_query, va_list args )
281 demux_sys_t *p_sys = p_demux->p_sys;
287 case DEMUX_GET_POSITION:
289 int64_t i_start = p_sys->i_ssnd_start;
290 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
291 int64_t i_tell = stream_Tell( p_demux->s );
293 pf = (double*) va_arg( args, double* );
295 if( i_start < i_end )
297 *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
303 case DEMUX_SET_POSITION:
305 int64_t i_start = p_sys->i_ssnd_start;
306 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
308 f = (double) va_arg( args, double );
310 if( i_start < i_end )
312 int i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
313 int64_t i_new = i_start + i_frame * p_sys->i_ssnd_fsize;
315 if( stream_Seek( p_demux->s, i_new ) )
319 p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
326 pi64 = (int64_t*)va_arg( args, int64_t * );
327 *pi64 = p_sys->i_time;
330 case DEMUX_GET_LENGTH:
332 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
334 pi64 = (int64_t*)va_arg( args, int64_t * );
335 if( p_sys->i_ssnd_start < i_end )
337 *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;