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* modules/demux/wav.c: proper channels re-ordering for multichannel audio (this should really be implemented as a common facility).

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This commit is contained in:
Gildas Bazin 2004-09-30 12:02:59 +00:00
parent f70500d263
commit be17d8e9bc
1 changed files with 136 additions and 0 deletions
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136
modules/demux/wav.c
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@ -28,9 +28,12 @@
#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/aout.h>
#include <codecs.h>
#define MAX_CHANNELS 6
/*****************************************************************************
* Module descriptor
*****************************************************************************/
@ -61,6 +64,10 @@ struct demux_sys_t
int i_frame_samples;
date_t pts;
uint32_t i_channel_mask;
vlc_bool_t b_chan_reorder; /* do we need channel reordering */
int pi_chan_table[MAX_CHANNELS];
};
#define __EVEN( x ) ( ( (x)%2 != 0 ) ? ((x)+1) : (x) )
@ -71,6 +78,23 @@ static void FrameInfo_IMA_ADPCM( demux_t *, unsigned int *, int * );
static void FrameInfo_MS_ADPCM ( demux_t *, unsigned int *, int * );
static void FrameInfo_PCM ( demux_t *, unsigned int *, int * );
static const uint32_t pi_channels_in[] =
{ WAVE_SPEAKER_FRONT_LEFT, WAVE_SPEAKER_FRONT_RIGHT,
WAVE_SPEAKER_FRONT_CENTER, WAVE_SPEAKER_LOW_FREQUENCY,
WAVE_SPEAKER_BACK_LEFT, WAVE_SPEAKER_BACK_RIGHT };
static const uint32_t pi_channels_out[] =
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
AOUT_CHAN_CENTER, AOUT_CHAN_LFE,
AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT };
static const uint32_t pi_channels_ordered[] =
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
AOUT_CHAN_CENTER, AOUT_CHAN_LFE };
static void CheckReordering( demux_t *, int );
static void InterleaveS16( int16_t *, int, int *, int );
static void InterleaveFloat32( float *, int, int *, int );
/*****************************************************************************
* Open: check file and initializes structures
*****************************************************************************/
@ -101,6 +125,8 @@ static int Open( vlc_object_t * p_this )
p_demux->pf_control = Control;
p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
p_sys->p_es = NULL;
p_sys->b_chan_reorder = 0;
p_sys->i_channel_mask = 0;
/* skip riff header */
stream_Read( p_demux->s, NULL, 12 ); /* cannot fail as peek succeed */
@ -144,10 +170,27 @@ static int Open( vlc_object_t * p_this )
if( GetWLE( &p_wf->wFormatTag ) == WAVE_FORMAT_EXTENSIBLE &&
i_size >= sizeof( WAVEFORMATEXTENSIBLE ) )
{
int i, i_channel_mask;
wf_tag_to_fourcc( GetWLE( &p_wf_ext->SubFormat ),
&p_sys->fmt.i_codec, &psz_name );
i_extended = sizeof( WAVEFORMATEXTENSIBLE ) - sizeof( WAVEFORMATEX );
p_sys->fmt.i_extra -= i_extended;
i_channel_mask = GetDWLE( &p_wf_ext->dwChannelMask );
if( i_channel_mask )
{
for( i = 0; i < sizeof(pi_channels_in)/sizeof(uint32_t); i++ )
{
if( i_channel_mask & pi_channels_in[i] )
p_sys->i_channel_mask |= pi_channels_out[i];
}
msg_Dbg( p_demux, "channel mask: %x", p_sys->i_channel_mask );
CheckReordering( p_demux, p_sys->fmt.audio.i_channels );
}
p_sys->fmt.audio.i_physical_channels =
p_sys->fmt.audio.i_original_channels =
p_sys->i_channel_mask;
}
if( p_sys->fmt.i_extra > 0 )
@ -261,6 +304,21 @@ static int Demux( demux_t *p_demux )
/* set PCR */
es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
/* Do the channel reordering */
if( p_sys->b_chan_reorder )
{
if( p_sys->fmt.i_codec == VLC_FOURCC('a','r','a','w') &&
p_sys->fmt.audio.i_bitspersample == 16 )
InterleaveS16( (int16_t *)p_block->p_buffer,
p_block->i_buffer, p_sys->pi_chan_table,
p_sys->fmt.audio.i_channels );
else if( p_sys->fmt.i_codec == VLC_FOURCC('a','f','l','t') &&
p_sys->fmt.audio.i_bitspersample == 32 )
InterleaveFloat32( (float *)p_block->p_buffer,
p_block->i_buffer, p_sys->pi_chan_table,
p_sys->fmt.audio.i_channels );
}
es_out_Send( p_demux->out, p_sys->p_es, p_block );
return 1;
@ -378,3 +436,81 @@ static void FrameInfo_IMA_ADPCM( demux_t *p_demux, unsigned int *pi_size,
*pi_size = p_sys->fmt.audio.i_blockalign;
}
/*****************************************************************************
* CheckReordering: Check if we need to do some channel re-ordering
* (our channel order is different from the one chosen by Microsoft).
*****************************************************************************/
static void CheckReordering( demux_t *p_demux, int i_nb_channels )
{
demux_sys_t *p_sys = p_demux->p_sys;
int i, j, k, l;
p_sys->b_chan_reorder = VLC_FALSE;
for( i = 0, j = 0;
i < (int)(sizeof(pi_channels_out)/sizeof(uint32_t)); i++ )
{
if( p_sys->i_channel_mask & pi_channels_out[i] )
{
for( k = 0, l = 0;
pi_channels_out[i] != pi_channels_ordered[k]; k++ )
{
if( p_sys->i_channel_mask & pi_channels_ordered[k] )
{
l++;
}
}
p_sys->pi_chan_table[j] = l;
j++;
}
}
for( i = 0; i < i_nb_channels; i++ )
{
if( p_sys->pi_chan_table[i] != i ) p_sys->b_chan_reorder = VLC_TRUE;
}
if( p_sys->b_chan_reorder ) msg_Dbg( p_demux, "channel reordering needed");
}
/*****************************************************************************
* InterleaveFloat32/S16: change the channel order to the Microsoft one.
*****************************************************************************/
static void InterleaveFloat32( float *p_buf, int i_buf, int *pi_chan_table,
int i_nb_channels )
{
int i, j;
float p_tmp[MAX_CHANNELS];
for( i = 0; i < i_buf / i_nb_channels / sizeof(float); i++ )
{
for( j = 0; j < i_nb_channels; j++ )
{
p_tmp[pi_chan_table[j]] = p_buf[i*i_nb_channels + j];
}
memcpy( &p_buf[i*i_nb_channels], p_tmp,
i_nb_channels * sizeof(float) );
}
}
static void InterleaveS16( int16_t *p_buf, int i_buf, int *pi_chan_table,
int i_nb_channels )
{
int i, j;
int16_t p_tmp[MAX_CHANNELS];
for( i = 0; i < i_buf / i_nb_channels / sizeof(int16_t); i++ )
{
for( j = 0; j < i_nb_channels; j++ )
{
p_tmp[pi_chan_table[j]] = p_buf[i*i_nb_channels + j];
}
memcpy( &p_buf[i*i_nb_channels], p_tmp,
i_nb_channels * sizeof(int16_t) );
}
}