Commit ea6b5e75 authored by Laurent Aimar's avatar Laurent Aimar
Browse files

* aac.c : big clean up and use ninput.h

parent 6235a428
/*****************************************************************************
* 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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