Skip to content

V
vlc-2-2
Commit 04c4affb authored by Gildas Bazin's avatar Gildas Bazin
Browse files
Options 

* modules/codec/faad.c: proper channels re-ordering for multi-channels audio.
parent f869db1f
Hide whitespace changes
Inline Side-by-side
Showing with 103 additions and 39 deletions
modules/codec/faad.c
View file @ 04c4affb
......@@ -2,9 +2,10 @@
* decoder.c: AAC decoder using libfaad2
*****************************************************************************
* Copyright (C) 2001, 2003 VideoLAN
* $Id: faad.c,v 1.7 2003/12/03 12:19:55 fenrir Exp $
* $Id: faad.c,v 1.8 2003/12/12 23:15:40 gbazin Exp $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Gildas Bazin <gbazin@netcourrier.com>
*
* 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
......@@ -39,11 +40,14 @@ vlc_module_begin();
set_callbacks( Open, Close );
vlc_module_end();
/****************************************************************************
* Local prototypes
****************************************************************************/
static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
static void DoReordering( decoder_t *, uint32_t *, uint32_t *, int, int,
uint32_t * );
#define MAX_CHANNEL_POSITIONS 9
struct decoder_sys_t
{
......@@ -57,23 +61,28 @@ struct decoder_sys_t
uint8_t *p_buffer;
int i_buffer;
int i_buffer_size;
};
static unsigned int pi_channels_maps[7] =
{
0,
AOUT_CHAN_CENTER,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT |
AOUT_CHAN_REARRIGHT,
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
AOUT_CHAN_REARRIGHT,
/* FIXME */
AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
AOUT_CHAN_REARRIGHT | AOUT_CHAN_REARCENTER
/* Channel positions of the current stream (for re-ordering) */
uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
};
static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
{ FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
BACK_CHANNEL_CENTER, LFE_CHANNEL };
static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
{ AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
};
/*****************************************************************************
* OpenDecoder: probe the decoder and return score
*****************************************************************************/
......@@ -109,6 +118,9 @@ static int Open( vlc_object_t *p_this )
p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
p_dec->pf_decode_audio = DecodeBlock;
p_dec->fmt_out.audio.i_physical_channels =
p_dec->fmt_out.audio.i_original_channels = 0;
if( p_dec->fmt_in.i_extra > 0 )
{
/* We have a decoder config so init the handle */
......@@ -124,10 +136,6 @@ static int Open( vlc_object_t *p_this )
p_dec->fmt_out.audio.i_rate = i_rate;
p_dec->fmt_out.audio.i_channels = i_channels;
p_dec->fmt_out.audio.i_physical_channels =
p_dec->fmt_out.audio.i_original_channels =
pi_channels_maps[i_channels];
aout_DateInit( &p_sys->date, i_rate );
}
else
......@@ -135,8 +143,6 @@ static int Open( vlc_object_t *p_this )
/* Will be initalised from first frame */
p_dec->fmt_out.audio.i_rate = 0;
p_dec->fmt_out.audio.i_channels = 0;
p_dec->fmt_out.audio.i_physical_channels =
p_dec->fmt_out.audio.i_original_channels = 0;
}
/* Set the faad config */
......@@ -145,9 +151,8 @@ static int Open( vlc_object_t *p_this )
faacDecSetConfiguration( p_sys->hfaad, cfg );
/* buffer */
p_sys->i_buffer = 0;
p_sys->i_buffer_size = 10000;
p_sys->p_buffer = malloc( p_sys->i_buffer_size );
p_sys->i_buffer = p_sys->i_buffer_size = 0;
p_sys->p_buffer = 0;
return VLC_SUCCESS;
}
......@@ -201,10 +206,6 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
p_dec->fmt_out.audio.i_rate = i_rate;
p_dec->fmt_out.audio.i_channels = i_channels;
p_dec->fmt_out.audio.i_physical_channels =
p_dec->fmt_out.audio.i_original_channels =
pi_channels_maps[i_channels];
aout_DateInit( &p_sys->date, i_rate );
}
......@@ -226,6 +227,7 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
void *samples;
faacDecFrameInfo frame;
aout_buffer_t *p_out;
int i, j;
samples = faacDecDecode( p_sys->hfaad, &frame,
p_sys->p_buffer, p_sys->i_buffer );
......@@ -240,12 +242,17 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
return NULL;
}
if( frame.channels <= 0 || frame.channels > 6 )
if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
{
msg_Warn( p_dec, "invalid channels count" );
msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
/* Flush the buffer */
p_sys->i_buffer = 0;
p_sys->i_buffer -= frame.bytesconsumed;
if( p_sys->i_buffer > 0 )
{
memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
p_sys->i_buffer );
}
block_Release( p_block );
return NULL;
}
......@@ -255,7 +262,12 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
msg_Warn( p_dec, "decoded zero samples" );
/* Flush the buffer */
p_sys->i_buffer = 0;
p_sys->i_buffer -= frame.bytesconsumed;
if( p_sys->i_buffer > 0 )
{
memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
p_sys->i_buffer );
}
block_Release( p_block );
return NULL;
}
......@@ -270,12 +282,27 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
p_dec->fmt_out.audio.i_rate = frame.samplerate;
p_dec->fmt_out.audio.i_channels = frame.channels;
p_dec->fmt_out.audio.i_physical_channels =
p_dec->fmt_out.audio.i_original_channels =
pi_channels_maps[frame.channels];
p_out = p_dec->pf_aout_buffer_new( p_dec,
frame.samples / frame.channels );
/* Convert frame.channel_position to our own channel values */
for( i = 0; i < frame.channels; i++ )
{
/* Find the channel code */
for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
{
if( frame.channel_position[i] == pi_channels_in[j] )
{
p_sys->pi_channel_positions[i] = pi_channels_out[j];
p_dec->fmt_out.audio.i_physical_channels |=
pi_channels_out[j];
break;
}
}
}
p_dec->fmt_out.audio.i_original_channels =
p_dec->fmt_out.audio.i_physical_channels;
p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
if( p_out == NULL )
{
p_sys->i_buffer = 0;
......@@ -287,7 +314,9 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
p_out->end_date = aout_DateIncrement( &p_sys->date,
frame.samples / frame.channels );
memcpy( p_out->p_buffer, samples, p_out->i_nb_bytes );
DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples,
frame.samples / frame.channels, frame.channels,
p_sys->pi_channel_positions );
p_sys->i_buffer -= frame.bytesconsumed;
if( p_sys->i_buffer > 0 )
......@@ -314,3 +343,38 @@ static void Close( vlc_object_t *p_this )
faacDecClose( p_sys->hfaad );
free( p_sys );
}
/*****************************************************************************
* DoReordering: do some channel re-ordering (the ac3 channel order is
* different from the aac one).
*****************************************************************************/
static void DoReordering( decoder_t *p_dec,
uint32_t *p_out, uint32_t *p_in, int i_samples,
int i_nb_channels, uint32_t *pi_chan_positions )
{
int pi_chan_table[MAX_CHANNEL_POSITIONS];
int i, j, k;
/* Find the channels mapping */
for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
{
for( k = 0; k < i_nb_channels; k++ )
{
if( pi_channels_ordered[i] == pi_chan_positions[k] )
{
pi_chan_table[k] = j++;
break;
}
}
}
/* Do the actual reordering */
for( i = 0; i < i_samples; i++ )
{
for( j = 0; j < i_nb_channels; j++ )
{
p_out[i * i_nb_channels + pi_chan_table[j]] =
p_in[i * i_nb_channels + j];
}
}
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment