Commit e8350fda authored by Laurent Aimar's avatar Laurent Aimar

* aiff: another demuxer.

parent 357a6d15
...@@ -19,3 +19,4 @@ SOURCES_ps2 = ps.c ps.h ...@@ -19,3 +19,4 @@ SOURCES_ps2 = ps.c ps.h
SOURCES_dvdnav = dvdnav.c SOURCES_dvdnav = dvdnav.c
SOURCES_mod = mod.c SOURCES_mod = mod.c
SOURCES_pva = pva.c SOURCES_pva = pva.c
SOURCES_aiff = aiff.c
/*****************************************************************************
* aiff.c: Audio Interchange File Format demuxer
*****************************************************************************
* Copyright (C) 2004 VideoLAN
* $Id: aiff.c,v 1.1 2004/01/28 12:25:37 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>
/* TODO:
* - ...
*/
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin();
set_description( _("AIFF demuxer" ) );
set_capability( "demux2", 10 );
set_callbacks( Open, Close );
add_shortcut( "aiff" );
vlc_module_end();
/*****************************************************************************
* Local prototypes
*****************************************************************************/
struct demux_sys_t
{
es_format_t fmt;
es_out_id_t *es;
int64_t i_ssnd_pos;
int64_t i_ssnd_size;
int i_ssnd_offset;
int i_ssnd_blocksize;
/* real data start */
int64_t i_ssnd_start;
int64_t i_ssnd_end;
int i_ssnd_fsize;
int64_t i_time;
};
static int Demux ( demux_t *p_demux );
static int Control( demux_t *p_demux, int i_query, va_list args );
/* GetF80BE: read a 80 bits float in big endian */
static unsigned int GetF80BE( uint8_t p[10] )
{
unsigned int i_mantissa = GetDWBE( &p[2] );
int i_exp = 30 - p[1];
unsigned int i_last = 0;
while( i_exp-- )
{
i_last = i_mantissa;
i_mantissa >>= 1;
}
if( i_last&0x01 )
{
i_mantissa++;
}
return i_mantissa;
}
/*****************************************************************************
* Open
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
uint8_t *p_peek;
if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
{
msg_Err( p_demux, "cannot peek" );
return VLC_EGENERIC;
}
if( strncmp( &p_peek[0], "FORM", 4 ) || strncmp( &p_peek[8], "AIFF", 4 ) )
{
msg_Warn( p_demux, "AIFF module discarded" );
return VLC_EGENERIC;
}
/* skip aiff header */
stream_Read( p_demux->s, NULL, 12 );
/* Fill p_demux field */
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
p_sys->i_time = 1;
p_sys->i_ssnd_pos = -1;
for( ;; )
{
uint32_t i_size;
if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
{
msg_Dbg( p_demux, "cannot peek()" );
goto error;
}
i_size = GetDWBE( &p_peek[4] );
msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
if( !strncmp( &p_peek[0], "COMM", 4 ) )
{
if( stream_Peek( p_demux->s, &p_peek, 18 + 8 ) < 18 + 8 )
{
msg_Dbg( p_demux, "cannot peek()" );
goto error;
}
es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
p_sys->fmt.audio.i_rate = GetF80BE( &p_peek[16] );
msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
}
else if( !strncmp( &p_peek[0], "SSND", 4 ) )
{
if( stream_Peek( p_demux->s, &p_peek, 8 + 8 ) < 8 + 8 )
{
msg_Dbg( p_demux, "cannot peek()" );
goto error;
}
p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
p_sys->i_ssnd_size= i_size;
p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
}
if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
{
/* We have found the 2 needed chunks */
break;
}
/* Skip this chunk */
if( stream_Read( p_demux->s, NULL, i_size + 8 ) != i_size + 8 )
{
msg_Warn( p_demux, "incomplete file" );
goto error;
}
}
p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
p_sys->i_ssnd_end = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
( p_sys->fmt.audio.i_bitspersample + 7 ) / 8;
if( p_sys->i_ssnd_fsize <= 0 )
{
msg_Err( p_demux, "invalid audio parameters" );
goto error;
}
if( p_sys->i_ssnd_size <= 0 )
{
/* unknown */
p_sys->i_ssnd_end = 0;
}
/* seek into SSND chunk */
if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
{
msg_Err( p_demux, "cannot seek to data chunk" );
goto error;
}
/* */
p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
return VLC_SUCCESS;
error:
free( p_sys );
return VLC_EGENERIC;
}
/*****************************************************************************
* Close
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
free( p_sys );
}
/*****************************************************************************
* Demux:
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
int64_t i_tell = stream_Tell( p_demux->s );
block_t *p_block;
int i_read;
if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
{
/* EOF */
return 0;
}
/* Set PCR */
es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
/* we will read 100ms at once */
i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
{
i_read = p_sys->i_ssnd_end - i_tell;
}
if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
{
return 0;
}
p_block->i_dts =
p_block->i_pts = p_sys->i_time;
p_sys->i_time += (int64_t)1000000 *
p_block->i_buffer /
p_sys->i_ssnd_fsize /
p_sys->fmt.audio.i_rate;
/* */
es_out_Send( p_demux->out, p_sys->es, p_block );
return 1;
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
demux_sys_t *p_sys = p_demux->p_sys;
double f, *pf;
int64_t *pi64;
switch( i_query )
{
case DEMUX_GET_POSITION:
{
int64_t i_start = p_sys->i_ssnd_start;
int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
int64_t i_tell = stream_Tell( p_demux->s );
pf = (double*) va_arg( args, double* );
if( i_start < i_end )
{
*pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
return VLC_SUCCESS;
}
return VLC_EGENERIC;
}
case DEMUX_SET_POSITION:
{
int64_t i_start = p_sys->i_ssnd_start;
int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
f = (double) va_arg( args, double );
if( i_start < i_end )
{
int i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
int64_t i_new = i_start + i_frame * p_sys->i_ssnd_fsize;
if( stream_Seek( p_demux->s, i_new ) )
{
return VLC_EGENERIC;
}
p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
return VLC_SUCCESS;
}
return VLC_EGENERIC;
}
case DEMUX_GET_TIME:
pi64 = (int64_t*)va_arg( args, int64_t * );
*pi64 = p_sys->i_time;
return VLC_SUCCESS;
case DEMUX_GET_LENGTH:
{
int64_t i_end = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
pi64 = (int64_t*)va_arg( args, int64_t * );
if( p_sys->i_ssnd_start < i_end )
{
*pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;
return VLC_SUCCESS;
}
return VLC_EGENERIC;
}
case DEMUX_SET_TIME:
case DEMUX_GET_FPS:
default:
return VLC_EGENERIC;
}
}
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