/*****************************************************************************
* adpcm.c : adpcm variant audio decoder
*****************************************************************************
- * Copyright (C) 2001, 2002 VideoLAN
+ * Copyright (C) 2001, 2002 the VideoLAN team
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ * Rémi Denis-Courmont <rem # videolan.org>
*
* 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
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Documentation: http://www.pcisys.net/~melanson/codecs/adpcm.txt
*****************************************************************************/
#include <vlc/vlc.h>
-#include <vlc/decoder.h>
+#include <vlc_aout.h>
+#include <vlc_codec.h>
/*****************************************************************************
* Module descriptor
ADPCM_IMA_WAV,
ADPCM_MS,
ADPCM_DK3,
- ADPCM_DK4
+ ADPCM_DK4,
+ ADPCM_EA
};
struct decoder_sys_t
static void DecodeAdpcmImaQT ( decoder_t *, int16_t *, uint8_t * );
static void DecodeAdpcmDk4 ( decoder_t *, int16_t *, uint8_t * );
static void DecodeAdpcmDk3 ( decoder_t *, int16_t *, uint8_t * );
+static void DecodeAdpcmEA ( decoder_t *, int16_t *, uint8_t * );
static int pi_channels_maps[6] =
{
case VLC_FOURCC('m','s',0x00,0x11): /* IMA ADPCM */
case VLC_FOURCC('m','s',0x00,0x61): /* Duck DK4 ADPCM */
case VLC_FOURCC('m','s',0x00,0x62): /* Duck DK3 ADPCM */
+ case VLC_FOURCC('X','A','J', 0): /* EA ADPCM */
break;
default:
return VLC_EGENERIC;
}
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_dec->p_sys = p_sys =
- (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
- {
- msg_Err( p_dec, "out of memory" );
- return VLC_EGENERIC;
- }
-
if( p_dec->fmt_in.audio.i_channels <= 0 ||
p_dec->fmt_in.audio.i_channels > 5 )
{
- msg_Err( p_dec, "bad channels count(1-5)" );
+ msg_Err( p_dec, "invalid number of channel (not between 1 and 5): %i",
+ p_dec->fmt_in.audio.i_channels );
return VLC_EGENERIC;
}
return VLC_EGENERIC;
}
+ /* Allocate the memory needed to store the decoder's structure */
+ if( ( p_dec->p_sys = p_sys =
+ (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
+ {
+ msg_Err( p_dec, "out of memory" );
+ return VLC_ENOMEM;
+ }
+
switch( p_dec->fmt_in.i_codec )
{
case VLC_FOURCC('i','m','a', '4'): /* IMA ADPCM */
case VLC_FOURCC('m','s',0x00,0x62): /* Duck DK3 ADPCM */
p_sys->codec = ADPCM_DK3;
break;
+ case VLC_FOURCC('X','A','J', 0): /* EA ADPCM */
+ p_sys->codec = ADPCM_EA;
+ p_dec->fmt_in.p_extra = calloc( 2 * p_dec->fmt_in.audio.i_channels,
+ sizeof( int16_t ) );
+ if( p_dec->fmt_in.p_extra == NULL )
+ {
+ free( p_sys );
+ return VLC_ENOMEM;
+ }
+ break;
}
if( p_dec->fmt_in.audio.i_blockalign <= 0 )
p_dec->fmt_in.audio.i_channels = 2;
p_sys->i_samplesperblock = ( 4 * ( p_sys->i_block - 16 ) + 2 )/ 3;
break;
+ case ADPCM_EA:
+ p_sys->i_samplesperblock =
+ 2 * (p_sys->i_block - p_dec->fmt_in.audio.i_channels) /
+ p_dec->fmt_in.audio.i_channels;
}
- msg_Dbg( p_dec, "format: samplerate:%dHz channels:%d bits/sample:%d "
+ msg_Dbg( p_dec, "format: samplerate:%d Hz channels:%d bits/sample:%d "
"blockalign:%d samplesperblock:%d",
p_dec->fmt_in.audio.i_rate, p_dec->fmt_in.audio.i_channels,
p_dec->fmt_in.audio.i_bitspersample, p_sys->i_block,
DecodeAdpcmDk3( p_dec, (int16_t*)p_out->p_buffer,
p_block->p_buffer );
break;
+ case ADPCM_EA:
+ DecodeAdpcmEA( p_dec, (int16_t*)p_out->p_buffer,
+ p_block->p_buffer );
default:
break;
}
decoder_t *p_dec = (decoder_t *)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
+ if( p_sys->codec == ADPCM_EA )
+ free( p_dec->fmt_in.p_extra );
free( p_sys );
}
}
}
}
+
+
+/*
+ * EA ADPCM
+ */
+#define MAX_CHAN 5
+static void DecodeAdpcmEA( decoder_t *p_dec, int16_t *p_sample,
+ uint8_t *p_buffer )
+{
+ static const uint32_t EATable[]=
+ {
+ 0x00000000, 0x000000F0, 0x000001CC, 0x00000188,
+ 0x00000000, 0x00000000, 0xFFFFFF30, 0xFFFFFF24,
+ 0x00000000, 0x00000001, 0x00000003, 0x00000004,
+ 0x00000007, 0x00000008, 0x0000000A, 0x0000000B,
+ 0x00000000, 0xFFFFFFFF, 0xFFFFFFFD, 0xFFFFFFFC
+ };
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ uint8_t *p_end;
+ unsigned i_channels, c;
+ int16_t *prev, *cur;
+ int32_t c1[MAX_CHAN], c2[MAX_CHAN];
+ int8_t d[MAX_CHAN];
+
+ i_channels = p_dec->fmt_in.audio.i_channels;
+ p_end = &p_buffer[p_sys->i_block];
+
+ prev = (int16_t *)p_dec->fmt_in.p_extra;
+ cur = prev + i_channels;
+
+ for (c = 0; c < i_channels; c++)
+ {
+ uint8_t input;
+
+ input = p_buffer[c];
+ c1[c] = EATable[input >> 4];
+ c2[c] = EATable[(input >> 4) + 4];
+ d[c] = (input & 0xf) + 8;
+ }
+
+ for( p_buffer += i_channels; p_buffer < p_end ; p_buffer += i_channels)
+ {
+ for (c = 0; c < i_channels; c++)
+ {
+ int32_t spl;
+
+ spl = (p_buffer[c] >> 4) & 0xf;
+ spl = (spl << 0x1c) >> d[c];
+ spl = (spl + cur[c] * c1[c] + prev[c] * c2[c] + 0x80) >> 8;
+ CLAMP( spl, -32768, 32767 );
+ prev[c] = cur[c];
+ cur[c] = spl;
+
+ *(p_sample++) = spl;
+ }
+
+ for (c = 0; c < i_channels; c++)
+ {
+ int32_t spl;
+
+ spl = p_buffer[c] & 0xf;
+ spl = (spl << 0x1c) >> d[c];
+ spl = (spl + cur[c] * c1[c] + prev[c] * c2[c] + 0x80) >> 8;
+ CLAMP( spl, -32768, 32767 );
+ prev[c] = cur[c];
+ cur[c] = spl;
+
+ *(p_sample++) = spl;
+ }
+ }
+}
projects / vlc / blobdiff