1 /*****************************************************************************
2 * aac.c : Raw aac Stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: aac.c,v 1.8 2003/11/21 00:38:01 gbazin 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>
32 /*****************************************************************************
34 *****************************************************************************/
35 static int Open ( vlc_object_t * );
36 static void Close ( vlc_object_t * );
39 set_description( _("AAC demuxer" ) );
40 set_capability( "demux", 10 );
41 set_callbacks( Open, Close );
42 add_shortcut( "aac" );
50 /*****************************************************************************
52 *****************************************************************************/
53 static int Demux ( input_thread_t * );
62 static int i_aac_samplerate[16] =
64 96000, 88200, 64000, 48000, 44100, 32000,
65 24000, 22050, 16000, 12000, 11025, 8000,
69 #define AAC_ID( p ) ( ((p)[1]>>3)&0x01 )
70 #define AAC_SAMPLE_RATE( p ) i_aac_samplerate[((p)[2]>>2)&0x0f]
71 #define AAC_CHANNELS( p ) ( (((p)[2]&0x01)<<2) | (((p)[3]>>6)&0x03) )
72 #define AAC_FRAME_SIZE( p ) ( (((p)[3]&0x03) << 11)|( (p)[4] << 3 )|( (((p)[5]) >>5)&0x7 ) )
73 /* FIXME it's plain wrong */
74 #define AAC_FRAME_SAMPLES( p ) 1024
76 static inline int HeaderCheck( uint8_t *p )
79 ( p[1]&0xf6 ) != 0xf0 ||
80 AAC_SAMPLE_RATE( p ) == 0 ||
81 AAC_CHANNELS( p ) == 0 ||
82 AAC_FRAME_SIZE( p ) == 0 )
90 /*****************************************************************************
91 * Open: initializes AAC demux structures
92 *****************************************************************************/
93 static int Open( vlc_object_t * p_this )
95 input_thread_t *p_input = (input_thread_t *)p_this;
97 int b_forced = VLC_FALSE;
106 if( p_input->psz_demux && !strncmp( p_input->psz_demux, "aac", 3 ) )
111 if( p_input->psz_name )
113 int i_len = strlen( p_input->psz_name );
115 if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".aac" ) )
123 /* I haven't find any sure working aac detection so only forced or
126 msg_Warn( p_input, "AAC module discarded" );
130 /* skip possible id3 header */
131 p_id3 = module_Need( p_input, "id3", NULL );
134 module_Unneed( p_input, p_id3 );
137 p_input->pf_demux = Demux;
138 p_input->pf_demux_control = demux_vaControlDefault;
140 p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
143 /* peek the begining (10 is for adts header) */
144 if( stream_Peek( p_input->s, &p_peek, 10 ) < 10 )
146 msg_Err( p_input, "cannot peek" );
150 if( !strncmp( p_peek, "ADIF", 4 ) )
152 msg_Err( p_input, "ADIF file. Not yet supported. (Please report)" );
156 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', '4', 'a' ) );
157 if( HeaderCheck( p_peek ) )
159 fmt.audio.i_channels = AAC_CHANNELS( p_peek );
160 fmt.audio.i_rate = AAC_SAMPLE_RATE( p_peek );
163 "adts header: id=%d channels=%d sample_rate=%d",
165 AAC_CHANNELS( p_peek ),
166 AAC_SAMPLE_RATE( p_peek ) );
169 vlc_mutex_lock( &p_input->stream.stream_lock );
170 if( input_InitStream( p_input, 0 ) == -1)
172 vlc_mutex_unlock( &p_input->stream.stream_lock );
173 msg_Err( p_input, "cannot init stream" );
176 p_input->stream.i_mux_rate = 0 / 50;
177 vlc_mutex_unlock( &p_input->stream.stream_lock );
179 p_sys->p_es = es_out_Add( p_input->p_es_out, &fmt );
189 /*****************************************************************************
190 * Demux: reads and demuxes data packets
191 *****************************************************************************
192 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
193 *****************************************************************************/
194 static int Demux( input_thread_t * p_input )
196 demux_sys_t *p_sys = p_input->p_demux_data;
202 if( stream_Peek( p_input->s, &p_peek, 8 ) < 8 )
204 msg_Warn( p_input, "cannot peek" );
208 if( !HeaderCheck( p_peek ) )
210 /* we need to resynch */
211 vlc_bool_t b_ok = VLC_FALSE;
215 i_peek = stream_Peek( p_input->s, &p_peek, 8096 );
218 msg_Warn( p_input, "cannot peek" );
224 if( HeaderCheck( p_peek ) )
235 msg_Warn( p_input, "garbage=%d bytes", i_skip );
236 stream_Read( p_input->s, NULL, i_skip );
240 memcpy( h, p_peek, 8 ); /* can't use p_peek after stream_* */
242 input_ClockManageRef( p_input,
243 p_input->stream.p_selected_program,
244 p_sys->i_time * 9 / 100 );
246 if( ( p_block = stream_Block( p_input->s, AAC_FRAME_SIZE( h ) ) ) == NULL )
248 msg_Warn( p_input, "cannot read data" );
253 p_block->i_pts = input_ClockGetTS( p_input,
254 p_input->stream.p_selected_program,
255 p_sys->i_time * 9 / 100 );
257 es_out_Send( p_input->p_es_out, p_sys->p_es, p_block );
259 p_sys->i_time += (mtime_t)1000000 *
260 (mtime_t)AAC_FRAME_SAMPLES( h ) /
261 (mtime_t)AAC_SAMPLE_RATE( h );
265 /*****************************************************************************
266 * Close: frees unused data
267 *****************************************************************************/
268 static void Close( vlc_object_t * p_this )
270 input_thread_t *p_input = (input_thread_t*)p_this;
271 demux_sys_t *p_sys = p_input->p_demux_data;