Energy quantization tuning.
Prediction coefficient now depends on the frame size. Also, the pdfs and means have been adjusted and better quantized. This breaks compatibility of course.
This commit is contained in:
Jean-Marc Valin
parent
2ed05631f8
commit
ca6533cd88
6 changed files with 28 additions and 30 deletions
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@ -986,7 +986,7 @@ int celt_encode_with_ec_float(CELTEncoder * restrict st, const celt_sig * pcm, c
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#else
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max_decay = .125*nbAvailableBytes;
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#endif
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quant_coarse_energy(st->mode, st->start, st->end, bandLogE, st->oldBandE, nbCompressedBytes*8, intra_ener, st->mode->prob, error, enc, C, max_decay);
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quant_coarse_energy(st->mode, st->start, st->end, bandLogE, st->oldBandE, nbCompressedBytes*8, intra_ener, st->mode->prob, error, enc, C, LM, max_decay);
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/* Variable bitrate */
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if (vbr_rate>0)
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{
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@ -1800,7 +1800,7 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
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ALLOC(fine_quant, st->mode->nbEBands, int);
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/* Get band energies */
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unquant_coarse_energy(st->mode, st->start, st->end, bandE, st->oldBandE, intra_ener, st->mode->prob, dec, C);
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unquant_coarse_energy(st->mode, st->start, st->end, bandE, st->oldBandE, intra_ener, st->mode->prob, dec, C, LM);
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ALLOC(tf_res, st->mode->nbEBands, int);
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tf_decode(st->start, st->end, C, isTransient, tf_res, nbAvailableBytes, LM, dec);
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@ -152,7 +152,6 @@ void dump_modes(FILE *file, CELTMode **modes, int nb_modes)
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fprintf(file, "%d,\t/* nbEBands */\n", mode->nbEBands);
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fprintf(file, "%d,\t/* pitchEnd */\n", mode->pitchEnd);
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fprintf(file, "eBands%d_%d,\t/* eBands */\n", mode->Fs, mdctSize);
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fprintf(file, WORD16 ",\t/* ePredCoef */\n", mode->ePredCoef);
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fprintf(file, "%d,\t/* nbAllocVectors */\n", mode->nbAllocVectors);
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fprintf(file, "allocVectors%d_%d,\t/* allocVectors */\n", mode->Fs, mdctSize);
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fprintf(file, "NULL,\t/* bits */\n");
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@ -334,7 +334,6 @@ CELTMode *celt_mode_create(celt_int32 Fs, int frame_size, int *error)
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goto failure;
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mode->marker_start = MODEPARTIAL;
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mode->Fs = Fs;
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mode->ePredCoef = QCONST16(.8f,15);
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/* Pre/de-emphasis depends on sampling rate. The "standard" pre-emphasis
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is defined as A(z) = 1 - 0.85*z^-1 at 48 kHz. Other rates should
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@ -44,7 +44,7 @@
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#define MAX_CONFIG_SIZES 5
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#define CELT_BITSTREAM_VERSION 0x8000000c
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#define CELT_BITSTREAM_VERSION 0x8000000d
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#ifdef STATIC_MODES
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#include "static_modes.h"
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@ -52,14 +52,6 @@
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#define MAX_PERIOD 1024
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#ifndef MCHANNELS
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# ifdef DISABLE_STEREO
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# define MCHANNELS(mode) (1)
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# else
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# define MCHANNELS(mode) ((mode)->nbChannels)
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# endif
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#endif
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#ifndef CHANNELS
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# ifdef DISABLE_STEREO
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# define CHANNELS(_C) (1)
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@ -90,8 +82,6 @@ struct CELTMode {
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celt_word16 preemph[4];
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const celt_int16 *eBands; /**< Definition for each "pseudo-critical band" */
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celt_word16 ePredCoef;/**< Prediction coefficient for the energy encoding */
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int nbAllocVectors; /**< Number of lines in the matrix below */
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const unsigned char *allocVectors; /**< Number of bits in each band for several rates */
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@ -42,9 +42,16 @@
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#include "mathops.h"
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#include "stack_alloc.h"
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#define E_MEANS_SIZE (5)
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#define E_MEANS_SIZE (3)
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const celt_word16 eMeans[E_MEANS_SIZE] = {QCONST16(7.5f,DB_SHIFT), -QCONST16(1.33f,DB_SHIFT), -QCONST16(2.f,DB_SHIFT), -QCONST16(0.42f,DB_SHIFT), QCONST16(0.17f,DB_SHIFT)};
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static const celt_word16 eMeans[E_MEANS_SIZE] = {QCONST16(7.5f,DB_SHIFT), -QCONST16(1.f,DB_SHIFT), -QCONST16(.5f,DB_SHIFT)};
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/* prediction coefficients: 0.9, 0.8, 0.65, 0.5 */
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#ifdef FIXED_POINT
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static const celt_word16 pred_coef[4] = {29440, 26112, 21248, 16384};
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#else
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static const celt_word16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.};
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#endif
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/* FIXME: Implement for stereo */
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int intra_decision(celt_word16 *eBands, celt_word16 *oldEBands, int len)
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@ -68,12 +75,12 @@ int *quant_prob_alloc(const CELTMode *m)
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return NULL;
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for (i=0;i<m->nbEBands;i++)
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{
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prob[2*i] = 6000-i*200;
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prob[2*i] = 7000-i*200;
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prob[2*i+1] = ec_laplace_get_start_freq(prob[2*i]);
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}
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for (i=0;i<m->nbEBands;i++)
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{
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prob[2*m->nbEBands+2*i] = 9000-i*240;
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prob[2*m->nbEBands+2*i] = 9000-i*220;
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prob[2*m->nbEBands+2*i+1] = ec_laplace_get_start_freq(prob[2*m->nbEBands+2*i]);
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}
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return prob;
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@ -84,22 +91,23 @@ void quant_prob_free(int *freq)
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celt_free(freq);
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}
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void quant_coarse_energy(const CELTMode *m, int start, int end, const celt_word16 *eBands, celt_word16 *oldEBands, int budget, int intra, int *prob, celt_word16 *error, ec_enc *enc, int _C, celt_word16 max_decay)
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void quant_coarse_energy(const CELTMode *m, int start, int end, const celt_word16 *eBands, celt_word16 *oldEBands, int budget, int intra, int *prob, celt_word16 *error, ec_enc *enc, int _C, int LM, celt_word16 max_decay)
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{
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int i, c;
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celt_word32 prev[2] = {0,0};
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celt_word16 coef = m->ePredCoef;
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celt_word16 coef;
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celt_word16 beta;
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const int C = CHANNELS(_C);
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coef = pred_coef[LM];
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if (intra)
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{
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coef = 0;
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prob += 2*m->nbEBands;
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}
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/* The .8 is a heuristic */
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beta = MULT16_16_P15(QCONST16(.8f,15),coef);
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/* No theoretical justification for this, it just works */
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beta = MULT16_16_P15(coef,coef);
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/* Encode at a fixed coarse resolution */
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for (i=start;i<end;i++)
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{
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@ -228,21 +236,23 @@ void quant_energy_finalise(const CELTMode *m, int start, int end, celt_ener *eBa
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} while (++c < C);
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}
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void unquant_coarse_energy(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, int intra, int *prob, ec_dec *dec, int _C)
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void unquant_coarse_energy(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, int intra, int *prob, ec_dec *dec, int _C, int LM)
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{
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int i, c;
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celt_word32 prev[2] = {0, 0};
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celt_word16 coef = m->ePredCoef;
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celt_word16 coef;
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celt_word16 beta;
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const int C = CHANNELS(_C);
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coef = pred_coef[LM];
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if (intra)
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{
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coef = 0;
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prob += 2*m->nbEBands;
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}
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/* The .8 is a heuristic */
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beta = MULT16_16_P15(QCONST16(.8f,15),coef);
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/* No theoretical justification for this, it just works */
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beta = MULT16_16_P15(coef,coef);
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/* Decode at a fixed coarse resolution */
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for (i=start;i<end;i++)
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@ -56,13 +56,13 @@ void compute_fine_allocation(const CELTMode *m, int *bits, int budget);
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int intra_decision(celt_word16 *eBands, celt_word16 *oldEBands, int len);
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void quant_coarse_energy(const CELTMode *m, int start, int end, const celt_word16 *eBands, celt_word16 *oldEBands, int budget, int intra, int *prob, celt_word16 *error, ec_enc *enc, int _C, celt_word16 max_decay);
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void quant_coarse_energy(const CELTMode *m, int start, int end, const celt_word16 *eBands, celt_word16 *oldEBands, int budget, int intra, int *prob, celt_word16 *error, ec_enc *enc, int _C, int LM, celt_word16 max_decay);
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void quant_fine_energy(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, celt_word16 *error, int *fine_quant, ec_enc *enc, int _C);
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void quant_energy_finalise(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, celt_word16 *error, int *fine_quant, int *fine_priority, int bits_left, ec_enc *enc, int _C);
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void unquant_coarse_energy(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, int intra, int *prob, ec_dec *dec, int _C);
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void unquant_coarse_energy(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, int intra, int *prob, ec_dec *dec, int _C, int LM);
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void unquant_fine_energy(const CELTMode *m, int start, int end, celt_ener *eBands, celt_word16 *oldEBands, int *fine_quant, ec_dec *dec, int _C);
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