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webrtc/src/modules/audio_coding/codecs/iSAC/main/source/settings.h
turaj@webrtc.org fe4cfa7e5e Hi Tina, 
I have uploaded this patch for your review. I have done an extensive test to be sure that removing of tables does not create any problem. 

The test file, is called test_lpc.c which requires a hack to standard iSAC. The test computes LPC coefficients, then encodes and decodes with old and new (size-reduced) tables. It compares the results is all steps. I have ran the test over large set of files, more then 51 hours of audio, and there was no error. 

I tried to do no formatting so the review to be easier, but I know it can be a tricky CL. Hopefully, the test file helps you to be more confident on the CL. 

Thanks,... Turaj  

In this change list the LPC tables associated with mode 1 & 2 are remoded, and necessary cahnges are made to other files. 

The only model allowed is model number 0. Therefore, this CL breaks compatibility with iSAC released prior to 2.4.3. To avoid changing the bit-stream, we still keep the model number in the bit-stream. 

entropy_coding.c is cleaned up, especially encoding of LAR had KLT transform of LPC gains which are removed now. 
Review URL: https://webrtc-codereview.appspot.com/548004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2186 4adac7df-926f-26a2-2b94-8c16560cd09d
2012-05-07 20:36:22 +00:00

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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* settings.h
*
* Declaration of #defines used in the iSAC codec
*
*/
#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_MAIN_SOURCE_SETTINGS_H_
#define WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_MAIN_SOURCE_SETTINGS_H_
/* sampling frequency (Hz) */
#define FS 16000
/* number of samples per frame (either 320 (20ms), 480 (30ms) or 960 (60ms)) */
#define INITIAL_FRAMESAMPLES 960
#define MAXFFTSIZE 2048
#define NFACTOR 11
/* do not modify the following; this will have to be modified if we
* have a 20ms framesize option */
/**********************************************************************/
/* miliseconds */
#define FRAMESIZE 30
/* number of samples per frame processed in the encoder, 480 */
#define FRAMESAMPLES 480 /* ((FRAMESIZE*FS)/1000) */
#define FRAMESAMPLES_HALF 240
#define FRAMESAMPLES_QUARTER 120
/**********************************************************************/
/* max number of samples per frame (= 60 ms frame) */
#define MAX_FRAMESAMPLES 960
#define MAX_SWBFRAMESAMPLES (MAX_FRAMESAMPLES * 2)
/* number of samples per 10ms frame */
#define FRAMESAMPLES_10ms ((10*FS)/1000)
#define SWBFRAMESAMPLES_10ms (FRAMESAMPLES_10ms * 2)
/* number of samples in 30 ms frame */
#define FRAMESAMPLES_30ms 480
/* number of subframes */
#define SUBFRAMES 6
/* length of a subframe */
#define UPDATE 80
/* length of half a subframe (low/high band) */
#define HALF_SUBFRAMELEN (UPDATE/2)
/* samples of look ahead (in a half-band, so actually
* half the samples of look ahead @ FS) */
#define QLOOKAHEAD 24 /* 3 ms */
/* order of AR model in spectral entropy coder */
#define AR_ORDER 6
/* order of LP model in spectral entropy coder */
#define LP_ORDER 0
/* window length (masking analysis) */
#define WINLEN 256
/* order of low-band pole filter used to approximate masking curve */
#define ORDERLO 12
/* order of hi-band pole filter used to approximate masking curve */
#define ORDERHI 6
#define UB_LPC_ORDER 4
#define UB_LPC_VEC_PER_FRAME 2
#define UB16_LPC_VEC_PER_FRAME 4
#define UB_ACTIVE_SUBFRAMES 2
#define UB_MAX_LPC_ORDER 6
#define UB_INTERPOL_SEGMENTS 1
#define UB16_INTERPOL_SEGMENTS 3
#define LB_TOTAL_DELAY_SAMPLES 48
enum ISACBandwidth {isac8kHz = 8, isac12kHz = 12, isac16kHz = 16};
enum ISACBand{isacLowerBand = 0, isacUpperBand = 1};
#define UB_LPC_GAIN_DIM SUBFRAMES
#define FB_STATE_SIZE_WORD32 6
/* order for post_filter_bank */
#define POSTQORDER 3
/* order for pre-filterbank */
#define QORDER 3
/* another order */
#define QORDER_ALL (POSTQORDER+QORDER-1)
/* for decimator */
#define ALLPASSSECTIONS 2
/* array size for byte stream in number of bytes. */
/* The old maximum size still needed for the decoding */
#define STREAM_SIZE_MAX 600
#define STREAM_SIZE_MAX_30 200 /* 200 bytes=53.4 kbps @ 30 ms.framelength */
#define STREAM_SIZE_MAX_60 400 /* 400 bytes=53.4 kbps @ 60 ms.framelength */
/* storage size for bit counts */
#define BIT_COUNTER_SIZE 30
/* maximum order of any AR model or filter */
#define MAX_AR_MODEL_ORDER 12//50
/* For pitch analysis */
#define PITCH_FRAME_LEN (FRAMESAMPLES_HALF) /* 30 ms */
#define PITCH_MAX_LAG 140 /* 57 Hz */
#define PITCH_MIN_LAG 20 /* 400 Hz */
#define PITCH_MAX_GAIN 0.45
#define PITCH_MAX_GAIN_06 0.27 /* PITCH_MAX_GAIN*0.6 */
#define PITCH_MAX_GAIN_Q12 1843
#define PITCH_LAG_SPAN2 (PITCH_MAX_LAG/2-PITCH_MIN_LAG/2+5)
#define PITCH_CORR_LEN2 60 /* 15 ms */
#define PITCH_CORR_STEP2 (PITCH_FRAME_LEN/4)
#define PITCH_BW 11 /* half the band width of correlation surface */
#define PITCH_SUBFRAMES 4
#define PITCH_GRAN_PER_SUBFRAME 5
#define PITCH_SUBFRAME_LEN (PITCH_FRAME_LEN/PITCH_SUBFRAMES)
#define PITCH_UPDATE (PITCH_SUBFRAME_LEN/PITCH_GRAN_PER_SUBFRAME)
/* maximum number of peaks to be examined in correlation surface */
#define PITCH_MAX_NUM_PEAKS 10
#define PITCH_PEAK_DECAY 0.85
/* For weighting filter */
#define PITCH_WLPCORDER 6
#define PITCH_WLPCWINLEN PITCH_FRAME_LEN
#define PITCH_WLPCASYM 0.3 /* asymmetry parameter */
#define PITCH_WLPCBUFLEN PITCH_WLPCWINLEN
/* For pitch filter */
/* Extra 50 for fraction and LP filters */
#define PITCH_BUFFSIZE (PITCH_MAX_LAG + 50)
#define PITCH_INTBUFFSIZE (PITCH_FRAME_LEN+PITCH_BUFFSIZE)
/* Max rel. step for interpolation */
#define PITCH_UPSTEP 1.5
/* Max rel. step for interpolation */
#define PITCH_DOWNSTEP 0.67
#define PITCH_FRACS 8
#define PITCH_FRACORDER 9
#define PITCH_DAMPORDER 5
#define PITCH_FILTDELAY 1.5f
/* stepsize for quantization of the pitch Gain */
#define PITCH_GAIN_STEPSIZE 0.125
/* Order of high pass filter */
#define HPORDER 2
/* some mathematical constants */
/* log2(exp) */
#define LOG2EXP 1.44269504088896
#define PI 3.14159265358979
/* Maximum number of iterations allowed to limit payload size */
#define MAX_PAYLOAD_LIMIT_ITERATION 5
/* Redundant Coding */
#define RCU_BOTTLENECK_BPS 16000
#define RCU_TRANSCODING_SCALE 0.40f
#define RCU_TRANSCODING_SCALE_INVERSE 2.5f
#define RCU_TRANSCODING_SCALE_UB 0.50f
#define RCU_TRANSCODING_SCALE_UB_INVERSE 2.0f
/* Define Error codes */
/* 6000 General */
#define ISAC_MEMORY_ALLOCATION_FAILED 6010
#define ISAC_MODE_MISMATCH 6020
#define ISAC_DISALLOWED_BOTTLENECK 6030
#define ISAC_DISALLOWED_FRAME_LENGTH 6040
#define ISAC_UNSUPPORTED_SAMPLING_FREQUENCY 6050
/* 6200 Bandwidth estimator */
#define ISAC_RANGE_ERROR_BW_ESTIMATOR 6240
/* 6400 Encoder */
#define ISAC_ENCODER_NOT_INITIATED 6410
#define ISAC_DISALLOWED_CODING_MODE 6420
#define ISAC_DISALLOWED_FRAME_MODE_ENCODER 6430
#define ISAC_DISALLOWED_BITSTREAM_LENGTH 6440
#define ISAC_PAYLOAD_LARGER_THAN_LIMIT 6450
#define ISAC_DISALLOWED_ENCODER_BANDWIDTH 6460
/* 6600 Decoder */
#define ISAC_DECODER_NOT_INITIATED 6610
#define ISAC_EMPTY_PACKET 6620
#define ISAC_DISALLOWED_FRAME_MODE_DECODER 6630
#define ISAC_RANGE_ERROR_DECODE_FRAME_LENGTH 6640
#define ISAC_RANGE_ERROR_DECODE_BANDWIDTH 6650
#define ISAC_RANGE_ERROR_DECODE_PITCH_GAIN 6660
#define ISAC_RANGE_ERROR_DECODE_PITCH_LAG 6670
#define ISAC_RANGE_ERROR_DECODE_LPC 6680
#define ISAC_RANGE_ERROR_DECODE_SPECTRUM 6690
#define ISAC_LENGTH_MISMATCH 6730
#define ISAC_RANGE_ERROR_DECODE_BANDWITH 6740
#define ISAC_DISALLOWED_BANDWIDTH_MODE_DECODER 6750
#define ISAC_DISALLOWED_LPC_MODEL 6760
/* 6800 Call setup formats */
#define ISAC_INCOMPATIBLE_FORMATS 6810
#endif /* WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_MAIN_SOURCE_SETTINGS_H_ */
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