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videolan
vlc-1.1
Commits
ea6b5e75
Commit
ea6b5e75
authored
Aug 01, 2003
by
Laurent Aimar
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* aac.c : big clean up and use ninput.h
parent
6235a428
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modules/demux/aac.c
modules/demux/aac.c
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modules/demux/aac.c
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ea6b5e75
/*****************************************************************************
* aac.c : Raw aac Stream input module for vlc
*****************************************************************************
* Copyright (C) 2001 VideoLAN
* $Id: aac.c,v 1.1 2003/08/01 00:08:35 fenrir Exp $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h>
/* malloc(), free() */
#include <vlc/vlc.h>
#include <vlc/input.h>
#include <ninput.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static
int
Activate
(
vlc_object_t
*
);
static
void
Deactivate
(
vlc_object_t
*
);
vlc_module_begin
();
set_description
(
_
(
"AAC demuxer"
)
);
set_capability
(
"demux"
,
10
);
set_callbacks
(
Activate
,
Deactivate
);
add_shortcut
(
"aac"
);
vlc_module_end
();
/* TODO:
* - adif support ?
*
*/
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static
int
Demux
(
input_thread_t
*
);
struct
demux_sys_t
{
stream_t
*
s
;
mtime_t
i_time
;
es_descriptor_t
*
p_es
;
};
static
int
i_aac_samplerate
[
16
]
=
{
96000
,
88200
,
64000
,
48000
,
44100
,
32000
,
24000
,
22050
,
16000
,
12000
,
11025
,
8000
,
7350
,
0
,
0
,
0
};
#define AAC_ID( p ) ( ((p)[1]>>3)&0x01 )
#define AAC_SAMPLE_RATE( p ) i_aac_samplerate[((p)[2]>>2)&0x0f]
#define AAC_CHANNELS( p ) ( (((p)[2]&0x01)<<2) | (((p)[3]>>6)&0x03) )
#define AAC_FRAME_SIZE( p ) ( (((p)[3]&0x03) << 11)|( (p)[4] << 3 )|( (((p)[5]) >>5)&0x7 ) )
/* FIXME it's plain wrong */
#define AAC_FRAME_SAMPLES( p ) 1024
static
inline
int
HeaderCheck
(
uint8_t
*
p
)
{
if
(
p
[
0
]
!=
0xff
||
(
p
[
1
]
&
0xf6
)
!=
0xf0
||
AAC_SAMPLE_RATE
(
p
)
==
0
||
AAC_CHANNELS
(
p
)
==
0
||
AAC_FRAME_SIZE
(
p
)
==
0
)
{
return
VLC_FALSE
;
}
return
VLC_TRUE
;
}
/*****************************************************************************
* Activate: initializes AAC demux structures
*****************************************************************************/
static
int
Activate
(
vlc_object_t
*
p_this
)
{
input_thread_t
*
p_input
=
(
input_thread_t
*
)
p_this
;
demux_sys_t
*
p_sys
;
int
b_forced
=
VLC_FALSE
;
uint8_t
*
p_peek
;
module_t
*
p_id3
;
if
(
p_input
->
psz_demux
&&
!
strncmp
(
p_input
->
psz_demux
,
"aac"
,
3
)
)
{
b_forced
=
VLC_TRUE
;
}
if
(
p_input
->
psz_name
)
{
int
i_len
=
strlen
(
p_input
->
psz_name
);
if
(
i_len
>
4
&&
!
strcasecmp
(
&
p_input
->
psz_name
[
i_len
-
4
],
".aac"
)
)
{
b_forced
=
VLC_TRUE
;
}
}
if
(
!
b_forced
)
{
/* I haven't find any sure working aac detection so only forced or
* extention check
*/
msg_Warn
(
p_input
,
"AAC module discarded"
);
return
VLC_EGENERIC
;
}
/* skip possible id3 header */
p_id3
=
module_Need
(
p_input
,
"id3"
,
NULL
);
if
(
p_id3
)
{
module_Unneed
(
p_input
,
p_id3
);
}
p_input
->
pf_demux
=
Demux
;
p_input
->
p_demux_data
=
p_sys
=
malloc
(
sizeof
(
demux_sys_t
)
);
p_sys
->
i_time
=
0
;
if
(
(
p_sys
->
s
=
stream_OpenInput
(
p_input
)
)
==
NULL
)
{
msg_Err
(
p_input
,
"cannot create stream"
);
goto
error
;
}
/* peek the begining (10 is for adts header) */
if
(
stream_Peek
(
p_sys
->
s
,
&
p_peek
,
10
)
<
10
)
{
msg_Err
(
p_input
,
"cannot peek"
);
goto
error
;
}
if
(
!
strncmp
(
p_peek
,
"ADIF"
,
4
)
)
{
msg_Err
(
p_input
,
"ADIF file. Not yet supported. (Please report)"
);
goto
error
;
}
if
(
HeaderCheck
(
p_peek
)
)
{
input_info_category_t
*
p_category
;
msg_Dbg
(
p_input
,
"adts header: id=%d channels=%d sample_rate=%d"
,
AAC_ID
(
p_peek
),
AAC_CHANNELS
(
p_peek
),
AAC_SAMPLE_RATE
(
p_peek
)
);
vlc_mutex_lock
(
&
p_input
->
stream
.
stream_lock
);
p_category
=
input_InfoCategory
(
p_input
,
_
(
"Aac"
)
);
input_AddInfo
(
p_category
,
_
(
"Input Type"
),
"MPEG-%d AAC"
,
AAC_ID
(
p_peek
)
==
1
?
2
:
4
);
input_AddInfo
(
p_category
,
_
(
"Channels"
),
"%d"
,
AAC_CHANNELS
(
p_peek
)
);
input_AddInfo
(
p_category
,
_
(
"Sample Rate"
),
"%dHz"
,
AAC_SAMPLE_RATE
(
p_peek
)
);
vlc_mutex_unlock
(
&
p_input
->
stream
.
stream_lock
);
}
vlc_mutex_lock
(
&
p_input
->
stream
.
stream_lock
);
if
(
input_InitStream
(
p_input
,
0
)
==
-
1
)
{
vlc_mutex_unlock
(
&
p_input
->
stream
.
stream_lock
);
msg_Err
(
p_input
,
"cannot init stream"
);
goto
error
;
}
if
(
input_AddProgram
(
p_input
,
0
,
0
)
==
NULL
)
{
vlc_mutex_unlock
(
&
p_input
->
stream
.
stream_lock
);
msg_Err
(
p_input
,
"cannot add program"
);
goto
error
;
}
p_input
->
stream
.
pp_programs
[
0
]
->
b_is_ok
=
0
;
p_input
->
stream
.
p_selected_program
=
p_input
->
stream
.
pp_programs
[
0
];
p_input
->
stream
.
i_mux_rate
=
0
/
50
;
p_sys
->
p_es
=
input_AddES
(
p_input
,
p_input
->
stream
.
p_selected_program
,
1
,
AUDIO_ES
,
NULL
,
0
);
p_sys
->
p_es
->
i_stream_id
=
1
;
p_sys
->
p_es
->
i_fourcc
=
VLC_FOURCC
(
'm'
,
'p'
,
'4'
,
'a'
);
input_SelectES
(
p_input
,
p_sys
->
p_es
);
p_input
->
stream
.
p_selected_program
->
b_is_ok
=
1
;
vlc_mutex_unlock
(
&
p_input
->
stream
.
stream_lock
);
return
VLC_SUCCESS
;
error:
if
(
p_sys
->
s
)
{
stream_Release
(
p_sys
->
s
);
}
free
(
p_sys
);
return
VLC_EGENERIC
;
}
/*****************************************************************************
* Demux: reads and demuxes data packets
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
*****************************************************************************/
static
int
Demux
(
input_thread_t
*
p_input
)
{
demux_sys_t
*
p_sys
=
p_input
->
p_demux_data
;
pes_packet_t
*
p_pes
;
uint8_t
h
[
8
];
uint8_t
*
p_peek
;
if
(
stream_Peek
(
p_sys
->
s
,
&
p_peek
,
8
)
<
8
)
{
msg_Warn
(
p_input
,
"cannot peek"
);
return
0
;
}
if
(
!
HeaderCheck
(
p_peek
)
)
{
/* we need to resynch */
vlc_bool_t
b_ok
=
VLC_FALSE
;
int
i_skip
=
0
;
int
i_peek
;
i_peek
=
stream_Peek
(
p_sys
->
s
,
&
p_peek
,
8096
);
if
(
i_peek
<
8
)
{
msg_Warn
(
p_input
,
"cannot peek"
);
return
0
;
}
while
(
i_peek
>=
8
)
{
if
(
HeaderCheck
(
p_peek
)
)
{
b_ok
=
VLC_TRUE
;
break
;
}
p_peek
++
;
i_peek
--
;
i_skip
++
;
}
msg_Warn
(
p_input
,
"garbage=%d bytes"
,
i_skip
);
stream_Read
(
p_sys
->
s
,
NULL
,
i_skip
);
return
1
;
}
memcpy
(
h
,
p_peek
,
8
);
/* can't use p_peek after stream_* */
input_ClockManageRef
(
p_input
,
p_input
->
stream
.
p_selected_program
,
p_sys
->
i_time
*
9
/
100
);
if
(
(
p_pes
=
stream_PesPacket
(
p_sys
->
s
,
AAC_FRAME_SIZE
(
h
)
)
)
==
NULL
)
{
msg_Warn
(
p_input
,
"cannot read data"
);
return
0
;
}
p_pes
->
i_dts
=
p_pes
->
i_pts
=
input_ClockGetTS
(
p_input
,
p_input
->
stream
.
p_selected_program
,
p_sys
->
i_time
*
9
/
100
);
if
(
!
p_sys
->
p_es
->
p_decoder_fifo
)
{
msg_Err
(
p_input
,
"no audio decoder"
);
input_DeletePES
(
p_input
->
p_method_data
,
p_pes
);
return
(
-
1
);
}
input_DecodePES
(
p_sys
->
p_es
->
p_decoder_fifo
,
p_pes
);
p_sys
->
i_time
+=
(
mtime_t
)
1000000
*
(
mtime_t
)
AAC_FRAME_SAMPLES
(
h
)
/
(
mtime_t
)
AAC_SAMPLE_RATE
(
h
);
return
(
1
);
}
/*****************************************************************************
* Deactivate: frees unused data
*****************************************************************************/
static
void
Deactivate
(
vlc_object_t
*
p_this
)
{
input_thread_t
*
p_input
=
(
input_thread_t
*
)
p_this
;
demux_sys_t
*
p_sys
=
p_input
->
p_demux_data
;
if
(
p_sys
->
s
)
{
stream_Release
(
p_sys
->
s
);
}
free
(
p_sys
);
}
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