| /* ------------------------------------------------------------------ |
| * 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[198] 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[198]) |
| { |
| 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 */ |
| } |
| } |
| } |
| } |
| |
| |
| |
| |