1 /*****************************************************************************
2 * aac.c : Raw aac Stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2003 VideoLAN
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_category( CAT_INPUT );
40 set_subcategory( SUBCAT_INPUT_DEMUX );
41 set_description( _("AAC demuxer" ) );
42 set_capability( "demux2", 100 );
43 set_callbacks( Open, Close );
44 add_shortcut( "aac" );
52 /*****************************************************************************
54 *****************************************************************************/
62 static int Demux ( demux_t * );
63 static int Control( demux_t *, int, va_list );
65 static int i_aac_samplerate[16] =
67 96000, 88200, 64000, 48000, 44100, 32000,
68 24000, 22050, 16000, 12000, 11025, 8000,
72 #define AAC_ID( p ) ( ((p)[1]>>3)&0x01 )
73 #define AAC_SAMPLE_RATE( p ) i_aac_samplerate[((p)[2]>>2)&0x0f]
74 #define AAC_CHANNELS( p ) ( (((p)[2]&0x01)<<2) | (((p)[3]>>6)&0x03) )
75 #define AAC_FRAME_SIZE( p ) ( (((p)[3]&0x03) << 11)|( (p)[4] << 3 )|( (((p)[5]) >>5)&0x7 ) )
77 /* FIXME it's plain wrong */
78 #define AAC_FRAME_SAMPLES( p ) 1024
80 static inline int HeaderCheck( uint8_t *p )
83 ( p[1]&0xf6 ) != 0xf0 ||
84 AAC_SAMPLE_RATE( p ) == 0 ||
85 AAC_CHANNELS( p ) == 0 ||
86 AAC_FRAME_SIZE( p ) == 0 )
93 /*****************************************************************************
94 * Open: initializes AAC demux structures
95 *****************************************************************************/
96 static int Open( vlc_object_t * p_this )
98 demux_t *p_demux = (demux_t*)p_this;
100 int b_forced = VLC_FALSE;
106 if( !strncmp( p_demux->psz_demux, "aac", 3 ) )
111 if( p_demux->psz_path )
113 int i_len = strlen( p_demux->psz_path );
115 if( i_len > 4 && !strcasecmp( &p_demux->psz_path[i_len - 4], ".aac" ) )
123 /* I haven't find any sure working aac detection so only forced or
126 msg_Warn( p_demux, "AAC module discarded" );
130 /* skip possible id3 header */
131 if( ( p_id3 = module_Need( p_demux, "id3", NULL, 0 ) ) )
133 module_Unneed( p_demux, p_id3 );
136 p_demux->pf_demux = Demux;
137 p_demux->pf_control = Control;
138 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
142 /* peek the begining (10 is for adts header) */
143 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
145 msg_Err( p_demux, "cannot peek" );
148 if( !strncmp( p_peek, "ADIF", 4 ) )
150 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
154 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', '4', 'a' ) );
155 if( HeaderCheck( p_peek ) )
157 fmt.audio.i_channels = AAC_CHANNELS( p_peek );
158 fmt.audio.i_rate = AAC_SAMPLE_RATE( p_peek );
161 "adts header: id=%d channels=%d sample_rate=%d",
163 AAC_CHANNELS( p_peek ),
164 AAC_SAMPLE_RATE( p_peek ) );
167 p_sys->p_es = es_out_Add( p_demux->out, &fmt );
176 /*****************************************************************************
177 * Demux: reads and demuxes data packets
178 *****************************************************************************
179 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
180 *****************************************************************************/
181 static int Demux( demux_t *p_demux )
183 demux_sys_t *p_sys = p_demux->p_sys;
189 if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
191 msg_Warn( p_demux, "cannot peek" );
195 if( !HeaderCheck( p_peek ) )
197 /* we need to resynch */
198 vlc_bool_t b_ok = VLC_FALSE;
202 i_peek = stream_Peek( p_demux->s, &p_peek, 8096 );
205 msg_Warn( p_demux, "cannot peek" );
211 if( HeaderCheck( p_peek ) )
222 msg_Warn( p_demux, "garbage=%d bytes", i_skip );
223 stream_Read( p_demux->s, NULL, i_skip );
227 memcpy( h, p_peek, 8 ); /* can't use p_peek after stream_* */
232 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time );
234 if( ( p_block = stream_Block( p_demux->s, AAC_FRAME_SIZE( h ) ) ) == NULL )
236 msg_Warn( p_demux, "cannot read data" );
240 p_block->i_dts = p_block->i_pts = p_sys->i_time;
242 es_out_Send( p_demux->out, p_sys->p_es, p_block );
244 p_sys->i_time += (mtime_t)1000000 *
245 (mtime_t)AAC_FRAME_SAMPLES( h ) /
246 (mtime_t)AAC_SAMPLE_RATE( h );
250 /*****************************************************************************
251 * Close: frees unused data
252 *****************************************************************************/
253 static void Close( vlc_object_t * p_this )
255 demux_t *p_demux = (demux_t*)p_this;
256 demux_sys_t *p_sys = p_demux->p_sys;
261 /*****************************************************************************
263 *****************************************************************************/
264 static int Control( demux_t *p_demux, int i_query, va_list args )
266 /* demux_sys_t *p_sys = p_demux->p_sys; */
267 /* FIXME calculate the bitrate */
268 if( i_query == DEMUX_SET_TIME )
271 return demux2_vaControlHelper( p_demux->s,
273 8*0, 1, i_query, args );