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/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
/*
------------------------------------------------------------------------------
PacketVideo Corp.
MP3 Decoder Library
Filename: pvmp3_reorder.cpp
Date: 09/21/2007
------------------------------------------------------------------------------
REVISION HISTORY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
int32 xr[ ], rescaled data
struct gr_info_s *gr_info, granule structure
mp3Header *info, mp3 header info
int32 Scratch_mem[168] for temporary usage
Outputs:
int32 xr[ ], reordered data
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
If short blocks are used (block_type[gr][ch]=='10'), the rescaled data
xr[scf_band][window][freq_line] shall be reordered in polyphase subband
order, xr[subband][window][freq_line], prior to the IMDCT operation.
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
[1] ISO MPEG Audio Subgroup Software Simulation Group (1996)
ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "pv_mp3dec_fxd_op.h"
#include "pvmp3_dec_defs.h"
#include "pvmp3_reorder.h"
#include "pvmp3_tables.h"
#include "mp3_mem_funcs.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL STORE/BUFFER/POINTER DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL FUNCTION REFERENCES
; Declare functions defined elsewhere and referenced in this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
; Declare variables used in this module but defined elsewhere
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
void pvmp3_reorder(int32 xr[SUBBANDS_NUMBER*FILTERBANK_BANDS],
granuleInfo *gr_info,
int32 *used_freq_lines,
mp3Header *info,
int32 Scratch_mem[168])
{
int32 sfreq = info->version_x + (info->version_x << 1);
sfreq += info->sampling_frequency;
if (gr_info->window_switching_flag && (gr_info->block_type == 2))
{
int32 sfb_lines;
int32 freq;
int32 src_line;
int32 sfb;
if (gr_info->mixed_block_flag)
{
/* REORDERING FOR REST SWITCHED SHORT */
sfb = 3; /* no reorder for low 2 subbands */
src_line = 36;
}
else
{ /* pure short */
sfb = 0;
src_line = 0;
}
int16 ct = src_line;
for (; sfb < 13; sfb++)
{
if (*used_freq_lines > 3*mp3_sfBandIndex[sfreq].s[sfb+1])
{
sfb_lines = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb];
for (freq = 0; freq < 3*sfb_lines; freq += 3)
{
int32 tmp1 = xr[src_line];
int32 tmp2 = xr[src_line+(sfb_lines)];
int32 tmp3 = xr[src_line+(sfb_lines<<1)];
src_line++;
Scratch_mem[freq ] = tmp1;
Scratch_mem[freq+1] = tmp2;
Scratch_mem[freq+2] = tmp3;
}
src_line += (sfb_lines << 1);
pv_memcpy(&xr[ct], Scratch_mem, sfb_lines*3*sizeof(int32));
ct += sfb_lines + (sfb_lines << 1);
}
else
{
sfb_lines = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb];
for (freq = 0; freq < 3*sfb_lines; freq += 3)
{
int32 tmp1 = xr[src_line];
int32 tmp2 = xr[src_line+(sfb_lines)];
int32 tmp3 = xr[src_line+(sfb_lines<<1)];
src_line++;
Scratch_mem[freq ] = tmp1;
Scratch_mem[freq+1] = tmp2;
Scratch_mem[freq+2] = tmp3;
}
pv_memcpy(&xr[ct], Scratch_mem, sfb_lines*3*sizeof(int32));
*used_freq_lines = mp3_sfBandIndex[sfreq].s[sfb+1] * 3;
sfb = 13; /* force out of the for-loop */
}
}
}
}
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