1 /*****************************************************************************
2 * aiff.c: Audio Interchange File Format demuxer
3 *****************************************************************************
4 * Copyright (C) 2004-2007 VLC authors and VideoLAN
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * 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 ) || 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 if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
131 i_size = GetDWBE( &p_peek[4] );
133 msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
135 if( !memcmp( p_peek, "COMM", 4 ) )
137 if( stream_Peek( p_demux->s, &p_peek, 18+8 ) < 18+8 )
140 es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
141 p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
142 p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
143 p_sys->fmt.audio.i_rate = GetF80BE( &p_peek[16] );
145 msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
146 GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ),
147 GetF80BE( &p_peek[16] ) );
149 else if( !memcmp( p_peek, "SSND", 4 ) )
151 if( stream_Peek( p_demux->s, &p_peek, 8+8 ) < 8+8 )
154 p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
155 p_sys->i_ssnd_size = i_size;
156 p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
157 p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
159 msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
160 p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
162 if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
164 /* We have found the 2 needed chunks */
168 /* Skip this chunk */
170 if( (i_size % 2) != 0 )
172 if( stream_Read( p_demux->s, NULL, i_size ) != (int)i_size )
174 msg_Warn( p_demux, "incomplete file" );
179 p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
180 p_sys->i_ssnd_end = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
182 p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
183 ((p_sys->fmt.audio.i_bitspersample + 7) / 8);
185 if( p_sys->i_ssnd_fsize <= 0 || p_sys->fmt.audio.i_rate == 0 )
187 msg_Err( p_demux, "invalid audio parameters" );
191 if( p_sys->i_ssnd_size <= 0 )
194 p_sys->i_ssnd_end = 0;
197 /* seek into SSND chunk */
198 if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
200 msg_Err( p_demux, "cannot seek to data chunk" );
205 p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
214 /*****************************************************************************
216 *****************************************************************************/
217 static void Close( vlc_object_t *p_this )
219 demux_t *p_demux = (demux_t*)p_this;
220 demux_sys_t *p_sys = p_demux->p_sys;
226 /*****************************************************************************
228 *****************************************************************************/
229 static int Demux( demux_t *p_demux )
231 demux_sys_t *p_sys = p_demux->p_sys;
232 int64_t i_tell = stream_Tell( p_demux->s );
237 if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
244 es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_time);
246 /* we will read 100ms at once */
247 i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
248 if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
250 i_read = p_sys->i_ssnd_end - i_tell;
252 if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
258 p_block->i_pts = VLC_TS_0 + p_sys->i_time;
260 p_sys->i_time += (int64_t)1000000 *
262 p_sys->i_ssnd_fsize /
263 p_sys->fmt.audio.i_rate;
266 es_out_Send( p_demux->out, p_sys->es, p_block );
270 /*****************************************************************************
272 *****************************************************************************/
273 static int Control( demux_t *p_demux, int i_query, va_list args )
275 demux_sys_t *p_sys = p_demux->p_sys;
281 case DEMUX_GET_POSITION:
283 int64_t i_start = p_sys->i_ssnd_start;
284 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
285 int64_t i_tell = stream_Tell( p_demux->s );
287 pf = (double*) va_arg( args, double* );
289 if( i_start < i_end )
291 *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
297 case DEMUX_SET_POSITION:
299 int64_t i_start = p_sys->i_ssnd_start;
300 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
302 f = (double) va_arg( args, double );
304 if( i_start < i_end )
306 int i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
307 int64_t i_new = i_start + i_frame * p_sys->i_ssnd_fsize;
309 if( stream_Seek( p_demux->s, i_new ) )
313 p_sys->i_time = (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
320 pi64 = (int64_t*)va_arg( args, int64_t * );
321 *pi64 = p_sys->i_time;
324 case DEMUX_GET_LENGTH:
326 int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
328 pi64 = (int64_t*)va_arg( args, int64_t * );
329 if( p_sys->i_ssnd_start < i_end )
331 *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;