summaryrefslogtreecommitdiffstats
path: root/media/libstagefright/codecs/mp3dec/src/pvmp3_dequantize_sample.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'media/libstagefright/codecs/mp3dec/src/pvmp3_dequantize_sample.cpp')
-rw-r--r--media/libstagefright/codecs/mp3dec/src/pvmp3_dequantize_sample.cpp452
1 files changed, 0 insertions, 452 deletions
diff --git a/media/libstagefright/codecs/mp3dec/src/pvmp3_dequantize_sample.cpp b/media/libstagefright/codecs/mp3dec/src/pvmp3_dequantize_sample.cpp
deleted file mode 100644
index 69e1987..0000000
--- a/media/libstagefright/codecs/mp3dec/src/pvmp3_dequantize_sample.cpp
+++ /dev/null
@@ -1,452 +0,0 @@
-/* ------------------------------------------------------------------
- * 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_dequantize_sample.cpp
-
- Functions:
- power_1_third
- pvmp3_dequantize_sample
-
- Date: 09/21/2007
-
-------------------------------------------------------------------------------
- REVISION HISTORY
-
-
- Description:
-
-------------------------------------------------------------------------------
- INPUT AND OUTPUT DEFINITIONS
-
-power_1_third
-int32 power_1_third( int32 xx)
-
-Input
- int32 xx, int32 in the [0, 8192] range
-
- Returns
-
- int32 xx^(1/3) int32 Q26 number representing
- the 1/3 power of the input
-
-------------------------------------------------------------------------------
- INPUT AND OUTPUT DEFINITIONS
-
-pvmp3_dequantize_sample
-
-Input
- int32 is[SUBBANDS_NUMBER*FILTERBANK_BANDS],
- mp3ScaleFactors *scalefac, scale factor structure
- struct gr_info_s *gr_info, granule structure informatiom
- mp3Header *info mp3 header info
-
- Returns
-
- int32 is[SUBBANDS_NUMBER*FILTERBANK_BANDS], dequantize output as (.)^(4/3)
-
-------------------------------------------------------------------------------
- FUNCTION DESCRIPTION
-
- dequantize sample
-
-------------------------------------------------------------------------------
- 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_dequantize_sample.h"
-#include "pvmp3_normalize.h"
-#include "mp3_mem_funcs.h"
-#include "pvmp3_tables.h"
-
-/*----------------------------------------------------------------------------
-; MACROS
-; Define module specific macros here
-----------------------------------------------------------------------------*/
-
-
-/*----------------------------------------------------------------------------
-; DEFINES
-; Include all pre-processor statements here. Include conditional
-; compile variables also.
-----------------------------------------------------------------------------*/
-#define Q30_fmt(a)(int32(double(0x40000000)*a))
-#define Q29_fmt(a)(int32(double(0x20000000)*a))
-
-/*----------------------------------------------------------------------------
-; LOCAL FUNCTION DEFINITIONS
-; Function Prototype declaration
-----------------------------------------------------------------------------*/
-
-/*----------------------------------------------------------------------------
-; LOCAL STORE/BUFFER/POINTER DEFINITIONS
-; Variable declaration - defined here and used outside this module
-----------------------------------------------------------------------------*/
-const int32 pretab[22] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0};
-
-const int32 pow_2_1_fourth[4] =
-{
- Q30_fmt(1.0), Q30_fmt(1.18920711500272),
- Q30_fmt(1.41421356237310), Q30_fmt(1.68179283050743)
-};
-
-const int32 two_cubic_roots[7] =
-{
- Q29_fmt(0), Q29_fmt(1.25992104989487),
- Q29_fmt(1.58740105196820), Q29_fmt(2.00000000000000),
- Q29_fmt(2.51984209978975), Q29_fmt(3.17480210393640),
- Q29_fmt(3.99999999999999)
-};
-
-/*----------------------------------------------------------------------------
-; 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
-----------------------------------------------------------------------------*/
-
-
-int32 power_1_third(int32 xx)
-{
-
- if (xx <= 512)
- {
- return (power_one_third[xx] >> 1);
- }
- else
- {
- if (xx >> 15)
- {
- return 0x7FFFFFFF; /* saturate any value over 32767 */
- }
- else
- {
- int32 x = xx;
- int32 m = 22 - pvmp3_normalize(xx);
-
- xx >>= m;
- xx = (power_one_third[xx]) + (((power_one_third[xx+1] - power_one_third[xx]) >> m) * (x & ((1 << m) - 1)));
- return (fxp_mul32_Q30(xx, two_cubic_roots[m]));
- }
-
- }
-}
-
-
-/*----------------------------------------------------------------------------
-; FUNCTION CODE
-----------------------------------------------------------------------------*/
-
-
-
-void pvmp3_dequantize_sample(int32 is[SUBBANDS_NUMBER*FILTERBANK_BANDS],
- mp3ScaleFactors *scalefac,
- granuleInfo *gr_info,
- int32 used_freq_lines,
- mp3Header *info)
-{
- int32 ss;
- int32 cb = 0;
- int32 global_gain;
- int32 sfreq = info->sampling_frequency + info->version_x + (info->version_x << 1);
-
- /* apply formula per block type */
-
- if (gr_info->window_switching_flag && (gr_info->block_type == 2))
- {
- int32 next_cb_boundary;
- int32 cb_begin = 0;
- int32 cb_width = 0;
- int32 mixstart = 8; /* added 2003/08/21 efs */
-
- if (info->version_x != MPEG_1)
- {
- mixstart = 6; /* different value in MPEG2 LSF */
- }
-
- if (gr_info->mixed_block_flag)
- {
- next_cb_boundary = mp3_sfBandIndex[sfreq].l[1]; /* LONG blocks: 0,1,3 */
- }
- else
- {
- next_cb_boundary = mp3_sfBandIndex[sfreq].s[1] * 3; /* pure SHORT block */
- cb_width = 0;
- }
-
- global_gain = gr_info->global_gain;
- int32 two_raise_one_fourth = pow_2_1_fourth[global_gain&0x3];
- global_gain = 12 + (global_gain >> 2);
-
- for (ss = 0 ; ss < used_freq_lines ; ss++)
- {
- if (ss == next_cb_boundary)
- {
- cb++; /* critical band counter */
- if (gr_info->mixed_block_flag)
- {
- if (next_cb_boundary == mp3_sfBandIndex[sfreq].l[mixstart])
- {
- next_cb_boundary = mp3_sfBandIndex[sfreq].s[4] * 3;
-
- cb_begin = mp3_sfBandIndex[sfreq].s[3] * 3;
- cb_width = 3;
- cb = 3;
- }
- else if (ss < mp3_sfBandIndex[sfreq].l[mixstart])
- {
- next_cb_boundary = mp3_sfBandIndex[sfreq].l[cb+1];
- }
- else
- {
- next_cb_boundary = mp3_sfBandIndex[sfreq].s[cb+1] * 3;
-
- cb_width = cb;
- cb_begin = mp3_sfBandIndex[sfreq].s[cb] * 3;
- }
-
- if (ss < 2*FILTERBANK_BANDS)
- { /* 1st 2 subbands of switched blocks */
- global_gain = (gr_info->global_gain);
- global_gain -= (1 + gr_info->scalefac_scale) *
- (scalefac->l[cb] + gr_info->preflag * pretab[cb]) << 1;
-
- two_raise_one_fourth = pow_2_1_fourth[global_gain&0x3];
- global_gain = 12 + (global_gain >> 2);
- }
- }
- else
- {
- next_cb_boundary = mp3_sfBandIndex[sfreq].s[cb+1] * 3;
- cb_width = cb;
- cb_begin = mp3_sfBandIndex[sfreq].s[cb] * 3;
- }
-
- } /* end-if ( ss == next_cb_boundary) */
-
- /* Do long/short dependent scaling operations. */
- if ((gr_info->mixed_block_flag == 0) || (gr_info->mixed_block_flag && (ss >= 2*FILTERBANK_BANDS)))
- {
- int32 temp2 = fxp_mul32_Q32((ss - cb_begin) << 16, mp3_shortwindBandWidths[sfreq][cb_width]);
- temp2 = (temp2 + 1) >> 15;
-
- global_gain = (gr_info->global_gain);
- global_gain -= gr_info->subblock_gain[temp2] << 3;
- global_gain -= (1 + gr_info->scalefac_scale) * (scalefac->s[temp2][cb] << 1);
-
- two_raise_one_fourth = pow_2_1_fourth[global_gain&0x3];
- global_gain = 12 + (global_gain >> 2);
-
- }
-
-
- /*
- * xr[sb][ss] = 2^(global_gain/4)
- */
-
- /* Scale quantized value. */
-
- /* 0 < abs(is[ss]) < 8192 */
-
- int32 tmp = fxp_mul32_Q30((is[ss] << 16), power_1_third(pv_abs(is[ ss])));
-
- tmp = fxp_mul32_Q30(tmp, two_raise_one_fourth);
-
- if (global_gain < 0)
- {
- int32 temp = - global_gain;
- if (temp < 32)
- {
- is[ss] = (tmp >> temp);
- }
- else
- {
- is[ss] = 0;
- }
- }
- else
- {
- is[ss] = (tmp << global_gain);
- }
-
- } /* for (ss=0 ; ss < used_freq_lines ; ss++) */
-
- }
- else
- {
-
- for (cb = 0 ; cb < 22 ; cb++)
- {
-
- /* Compute overall (global) scaling. */
-
- global_gain = (gr_info->global_gain);
-
- global_gain -= (1 + gr_info->scalefac_scale) *
- (scalefac->l[cb] + gr_info->preflag * pretab[cb]) << 1;
-
-
- int32 two_raise_one_fourth = pow_2_1_fourth[global_gain&0x3];
- global_gain = 12 + (global_gain >> 2);
-
- /*
- * xr[sb][ss] = 2^(global_gain/4)
- */
-
- /* Scale quantized value. */
-
- if (used_freq_lines >= mp3_sfBandIndex[sfreq].l[cb+1])
- {
- if (global_gain <= 0)
- {
- global_gain = - global_gain;
- if (global_gain < 32)
- {
- for (ss = mp3_sfBandIndex[sfreq].l[cb]; ss < mp3_sfBandIndex[sfreq].l[cb+1]; ss += 2)
- {
- int32 tmp = is[ss];
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss] = fxp_mul32_Q30(tmp, two_raise_one_fourth) >> global_gain;
- }
- tmp = is[ss+1];
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss+1] = fxp_mul32_Q30(tmp, two_raise_one_fourth) >> global_gain;
- }
- }
- }
- else
- {
- pv_memset(&is[ mp3_sfBandIndex[sfreq].l[cb]],
- 0,
- (mp3_sfBandIndex[sfreq].l[cb+1] - mp3_sfBandIndex[sfreq].l[cb])*sizeof(*is));
- }
- }
- else
- {
- for (ss = mp3_sfBandIndex[sfreq].l[cb]; ss < mp3_sfBandIndex[sfreq].l[cb+1]; ss += 2)
- {
- int32 tmp = is[ss];
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss] = fxp_mul32_Q30(tmp, two_raise_one_fourth) << global_gain;
- }
-
- tmp = is[ss+1];
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss+1] = fxp_mul32_Q30(tmp, two_raise_one_fourth) << global_gain;
- }
- }
- }
- }
- else
- {
- if (global_gain <= 0)
- {
- global_gain = - global_gain;
- if (global_gain < 32)
- {
- for (ss = mp3_sfBandIndex[sfreq].l[cb]; ss < used_freq_lines; ss += 2)
- {
- int32 tmp = is[ss];
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss] = fxp_mul32_Q30(tmp, two_raise_one_fourth) >> global_gain;
- }
- tmp = is[ss+1];
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss+1] = fxp_mul32_Q30(tmp, two_raise_one_fourth) >> global_gain;
- }
- }
-
- }
- else
- {
- pv_memset(&is[ mp3_sfBandIndex[sfreq].l[cb]],
- 0,
- (mp3_sfBandIndex[sfreq].l[cb+1] - mp3_sfBandIndex[sfreq].l[cb])*sizeof(*is));
- }
- }
- else
- {
- for (ss = mp3_sfBandIndex[sfreq].l[cb]; ss < used_freq_lines; ss++)
- {
- int32 tmp = is[ss];
-
- if (tmp)
- {
- tmp = fxp_mul32_Q30((tmp << 16), power_1_third(pv_abs(tmp)));
- is[ss] = fxp_mul32_Q30(tmp, two_raise_one_fourth) << global_gain;
- }
- }
- }
-
- cb = 22; // force breaking out of the loop
-
- } /* if ( used_freq_lines >= mp3_sfBandIndex[sfreq].l[cb+1]) */
-
- } /* for (cb=0 ; cb < 22 ; cb++) */
-
- } /* if (gr_info->window_switching_flag && (gr_info->block_type == 2)) */
-
-
- pv_memset(&is[used_freq_lines],
- 0,
- (FILTERBANK_BANDS*SUBBANDS_NUMBER - used_freq_lines)*sizeof(*is));
-
-}
-
generated by cgit v1.1 at 2024-06-09 08:08:19 +0000