531 lines
15 KiB
C
531 lines
15 KiB
C
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/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id$
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**/
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/* RVLC scalefactor decoding
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*
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* RVLC works like this:
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* 1. Only symmetric huffman codewords are used
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* 2. Total length of the scalefactor data is stored in the bitsream
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* 3. Scalefactors are DPCM coded
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* 4. Next to the starting value for DPCM the ending value is also stored
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*
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* With all this it is possible to read the scalefactor data from 2 sides.
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* If there is a bit error in the scalefactor data it is possible to start
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* decoding from the other end of the data, to find all but 1 scalefactor.
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*/
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#include "common.h"
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#include "structs.h"
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#include <stdlib.h>
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#include "syntax.h"
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#include "bits.h"
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#include "rvlc.h"
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#ifdef ERROR_RESILIENCE
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//#define PRINT_RVLC
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/* static function declarations */
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static uint8_t rvlc_decode_sf_forward(ic_stream *ics,
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bitfile *ld_sf,
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bitfile *ld_esc,
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uint8_t *is_used);
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#if 0
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static uint8_t rvlc_decode_sf_reverse(ic_stream *ics,
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bitfile *ld_sf,
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bitfile *ld_esc,
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uint8_t is_used);
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#endif
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static int8_t rvlc_huffman_sf(bitfile *ld_sf, bitfile *ld_esc,
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int8_t direction);
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static int8_t rvlc_huffman_esc(bitfile *ld_esc, int8_t direction);
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uint8_t rvlc_scale_factor_data(ic_stream *ics, bitfile *ld)
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{
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uint8_t bits = 9;
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ics->sf_concealment = faad_get1bit(ld
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DEBUGVAR(1,149,"rvlc_scale_factor_data(): sf_concealment"));
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ics->rev_global_gain = (uint8_t)faad_getbits(ld, 8
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DEBUGVAR(1,150,"rvlc_scale_factor_data(): rev_global_gain"));
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if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
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bits = 11;
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/* the number of bits used for the huffman codewords */
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ics->length_of_rvlc_sf = (uint16_t)faad_getbits(ld, bits
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DEBUGVAR(1,151,"rvlc_scale_factor_data(): length_of_rvlc_sf"));
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if (ics->noise_used)
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{
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ics->dpcm_noise_nrg = (uint16_t)faad_getbits(ld, 9
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DEBUGVAR(1,152,"rvlc_scale_factor_data(): dpcm_noise_nrg"));
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ics->length_of_rvlc_sf -= 9;
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}
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ics->sf_escapes_present = faad_get1bit(ld
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DEBUGVAR(1,153,"rvlc_scale_factor_data(): sf_escapes_present"));
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if (ics->sf_escapes_present)
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{
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ics->length_of_rvlc_escapes = (uint8_t)faad_getbits(ld, 8
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DEBUGVAR(1,154,"rvlc_scale_factor_data(): length_of_rvlc_escapes"));
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}
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if (ics->noise_used)
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{
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ics->dpcm_noise_last_position = (uint16_t)faad_getbits(ld, 9
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DEBUGVAR(1,155,"rvlc_scale_factor_data(): dpcm_noise_last_position"));
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}
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return 0;
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}
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uint8_t rvlc_decode_scale_factors(ic_stream *ics, bitfile *ld)
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{
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uint8_t result;
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uint8_t intensity_used = 0;
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uint8_t *rvlc_sf_buffer = NULL;
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uint8_t *rvlc_esc_buffer = NULL;
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bitfile ld_rvlc_sf, ld_rvlc_esc;
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// bitfile ld_rvlc_sf_rev, ld_rvlc_esc_rev;
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if (ics->length_of_rvlc_sf > 0)
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{
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/* We read length_of_rvlc_sf bits here to put it in a
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seperate bitfile.
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*/
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rvlc_sf_buffer = faad_getbitbuffer(ld, ics->length_of_rvlc_sf
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DEBUGVAR(1,156,"rvlc_decode_scale_factors(): bitbuffer: length_of_rvlc_sf"));
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faad_initbits(&ld_rvlc_sf, (void*)rvlc_sf_buffer, bit2byte(ics->length_of_rvlc_sf));
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// faad_initbits_rev(&ld_rvlc_sf_rev, (void*)rvlc_sf_buffer,
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// ics->length_of_rvlc_sf);
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}
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if (ics->sf_escapes_present)
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{
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/* We read length_of_rvlc_escapes bits here to put it in a
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seperate bitfile.
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*/
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rvlc_esc_buffer = faad_getbitbuffer(ld, ics->length_of_rvlc_escapes
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DEBUGVAR(1,157,"rvlc_decode_scale_factors(): bitbuffer: length_of_rvlc_escapes"));
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faad_initbits(&ld_rvlc_esc, (void*)rvlc_esc_buffer, bit2byte(ics->length_of_rvlc_escapes));
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// faad_initbits_rev(&ld_rvlc_esc_rev, (void*)rvlc_esc_buffer,
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// ics->length_of_rvlc_escapes);
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}
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/* decode the rvlc scale factors and escapes */
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result = rvlc_decode_sf_forward(ics, &ld_rvlc_sf,
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&ld_rvlc_esc, &intensity_used);
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// result = rvlc_decode_sf_reverse(ics, &ld_rvlc_sf_rev,
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// &ld_rvlc_esc_rev, intensity_used);
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if (rvlc_esc_buffer) faad_free(rvlc_esc_buffer);
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if (rvlc_sf_buffer) faad_free(rvlc_sf_buffer);
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if (ics->length_of_rvlc_sf > 0)
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faad_endbits(&ld_rvlc_sf);
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if (ics->sf_escapes_present)
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faad_endbits(&ld_rvlc_esc);
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return result;
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}
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static uint8_t rvlc_decode_sf_forward(ic_stream *ics, bitfile *ld_sf, bitfile *ld_esc,
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uint8_t *intensity_used)
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{
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int8_t g, sfb;
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int8_t t = 0;
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int8_t error = 0;
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int8_t noise_pcm_flag = 1;
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int16_t scale_factor = ics->global_gain;
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int16_t is_position = 0;
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int16_t noise_energy = ics->global_gain - 90 - 256;
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#ifdef PRINT_RVLC
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printf("\nglobal_gain: %d\n", ics->global_gain);
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#endif
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for (g = 0; g < ics->num_window_groups; g++)
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{
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for (sfb = 0; sfb < ics->max_sfb; sfb++)
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{
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if (error)
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{
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ics->scale_factors[g][sfb] = 0;
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} else {
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switch (ics->sfb_cb[g][sfb])
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{
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case ZERO_HCB: /* zero book */
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ics->scale_factors[g][sfb] = 0;
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break;
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case INTENSITY_HCB: /* intensity books */
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case INTENSITY_HCB2:
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*intensity_used = 1;
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/* decode intensity position */
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t = rvlc_huffman_sf(ld_sf, ld_esc, +1);
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is_position += t;
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ics->scale_factors[g][sfb] = is_position;
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break;
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case NOISE_HCB: /* noise books */
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/* decode noise energy */
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if (noise_pcm_flag)
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{
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int16_t n = ics->dpcm_noise_nrg;
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noise_pcm_flag = 0;
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noise_energy += n;
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} else {
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t = rvlc_huffman_sf(ld_sf, ld_esc, +1);
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noise_energy += t;
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}
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ics->scale_factors[g][sfb] = noise_energy;
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break;
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default: /* spectral books */
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/* decode scale factor */
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t = rvlc_huffman_sf(ld_sf, ld_esc, +1);
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scale_factor += t;
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if (scale_factor < 0)
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return 4;
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ics->scale_factors[g][sfb] = scale_factor;
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break;
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}
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#ifdef PRINT_RVLC
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printf("%3d:%4d%4d\n", sfb, ics->sfb_cb[g][sfb],
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ics->scale_factors[g][sfb]);
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#endif
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if (t == 99)
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{
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error = 1;
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}
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}
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}
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}
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#ifdef PRINT_RVLC
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printf("\n\n");
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#endif
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return 0;
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}
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#if 0 // not used right now, doesn't work correctly yet
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static uint8_t rvlc_decode_sf_reverse(ic_stream *ics, bitfile *ld_sf, bitfile *ld_esc,
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uint8_t intensity_used)
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{
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int8_t g, sfb;
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int8_t t = 0;
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int8_t error = 0;
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int8_t noise_pcm_flag = 1, is_pcm_flag = 1, sf_pcm_flag = 1;
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int16_t scale_factor = ics->rev_global_gain;
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int16_t is_position = 0;
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int16_t noise_energy = ics->rev_global_gain;
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#ifdef PRINT_RVLC
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printf("\nrev_global_gain: %d\n", ics->rev_global_gain);
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#endif
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if (intensity_used)
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{
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is_position = rvlc_huffman_sf(ld_sf, ld_esc, -1);
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#ifdef PRINT_RVLC
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printf("is_position: %d\n", is_position);
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#endif
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}
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for (g = ics->num_window_groups-1; g >= 0; g--)
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{
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for (sfb = ics->max_sfb-1; sfb >= 0; sfb--)
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{
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if (error)
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{
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ics->scale_factors[g][sfb] = 0;
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} else {
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switch (ics->sfb_cb[g][sfb])
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{
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case ZERO_HCB: /* zero book */
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ics->scale_factors[g][sfb] = 0;
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break;
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case INTENSITY_HCB: /* intensity books */
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case INTENSITY_HCB2:
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if (is_pcm_flag)
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{
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is_pcm_flag = 0;
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ics->scale_factors[g][sfb] = is_position;
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} else {
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t = rvlc_huffman_sf(ld_sf, ld_esc, -1);
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is_position -= t;
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ics->scale_factors[g][sfb] = (uint8_t)is_position;
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}
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break;
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case NOISE_HCB: /* noise books */
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/* decode noise energy */
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if (noise_pcm_flag)
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{
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noise_pcm_flag = 0;
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noise_energy = ics->dpcm_noise_last_position;
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} else {
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t = rvlc_huffman_sf(ld_sf, ld_esc, -1);
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noise_energy -= t;
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}
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ics->scale_factors[g][sfb] = (uint8_t)noise_energy;
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break;
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default: /* spectral books */
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if (sf_pcm_flag || (sfb == 0))
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{
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sf_pcm_flag = 0;
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if (sfb == 0)
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scale_factor = ics->global_gain;
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} else {
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/* decode scale factor */
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t = rvlc_huffman_sf(ld_sf, ld_esc, -1);
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scale_factor -= t;
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}
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if (scale_factor < 0)
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return 4;
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ics->scale_factors[g][sfb] = (uint8_t)scale_factor;
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break;
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}
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#ifdef PRINT_RVLC
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printf("%3d:%4d%4d\n", sfb, ics->sfb_cb[g][sfb],
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ics->scale_factors[g][sfb]);
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#endif
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if (t == 99)
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{
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error = 1;
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}
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}
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}
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}
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||
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|
||
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#ifdef PRINT_RVLC
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printf("\n\n");
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#endif
|
||
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return 0;
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}
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#endif
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|
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/* index == 99 means not allowed codeword */
|
||
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static rvlc_huff_table book_rvlc[] = {
|
||
|
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/*index length codeword */
|
||
|
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{ 0, 1, 0 }, /* 0 */
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||
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{ -1, 3, 5 }, /* 101 */
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||
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{ 1, 3, 7 }, /* 111 */
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{ -2, 4, 9 }, /* 1001 */
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{ -3, 5, 17 }, /* 10001 */
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|
{ 2, 5, 27 }, /* 11011 */
|
||
|
|
{ -4, 6, 33 }, /* 100001 */
|
||
|
|
{ 99, 6, 50 }, /* 110010 */
|
||
|
|
{ 3, 6, 51 }, /* 110011 */
|
||
|
|
{ 99, 6, 52 }, /* 110100 */
|
||
|
|
{ -7, 7, 65 }, /* 1000001 */
|
||
|
|
{ 99, 7, 96 }, /* 1100000 */
|
||
|
|
{ 99, 7, 98 }, /* 1100010 */
|
||
|
|
{ 7, 7, 99 }, /* 1100011 */
|
||
|
|
{ 4, 7, 107 }, /* 1101011 */
|
||
|
|
{ -5, 8, 129 }, /* 10000001 */
|
||
|
|
{ 99, 8, 194 }, /* 11000010 */
|
||
|
|
{ 5, 8, 195 }, /* 11000011 */
|
||
|
|
{ 99, 8, 212 }, /* 11010100 */
|
||
|
|
{ 99, 9, 256 }, /* 100000000 */
|
||
|
|
{ -6, 9, 257 }, /* 100000001 */
|
||
|
|
{ 99, 9, 426 }, /* 110101010 */
|
||
|
|
{ 6, 9, 427 }, /* 110101011 */
|
||
|
|
{ 99, 10, 0 } /* Shouldn't come this far */
|
||
|
|
};
|
||
|
|
|
||
|
|
static rvlc_huff_table book_escape[] = {
|
||
|
|
/*index length codeword */
|
||
|
|
{ 1, 2, 0 },
|
||
|
|
{ 0, 2, 2 },
|
||
|
|
{ 3, 3, 2 },
|
||
|
|
{ 2, 3, 6 },
|
||
|
|
{ 4, 4, 14 },
|
||
|
|
{ 7, 5, 13 },
|
||
|
|
{ 6, 5, 15 },
|
||
|
|
{ 5, 5, 31 },
|
||
|
|
{ 11, 6, 24 },
|
||
|
|
{ 10, 6, 25 },
|
||
|
|
{ 9, 6, 29 },
|
||
|
|
{ 8, 6, 61 },
|
||
|
|
{ 13, 7, 56 },
|
||
|
|
{ 12, 7, 120 },
|
||
|
|
{ 15, 8, 114 },
|
||
|
|
{ 14, 8, 242 },
|
||
|
|
{ 17, 9, 230 },
|
||
|
|
{ 16, 9, 486 },
|
||
|
|
{ 19, 10, 463 },
|
||
|
|
{ 18, 10, 974 },
|
||
|
|
{ 22, 11, 925 },
|
||
|
|
{ 20, 11, 1950 },
|
||
|
|
{ 21, 11, 1951 },
|
||
|
|
{ 23, 12, 1848 },
|
||
|
|
{ 25, 13, 3698 },
|
||
|
|
{ 24, 14, 7399 },
|
||
|
|
{ 26, 15, 14797 },
|
||
|
|
{ 49, 19, 236736 },
|
||
|
|
{ 50, 19, 236737 },
|
||
|
|
{ 51, 19, 236738 },
|
||
|
|
{ 52, 19, 236739 },
|
||
|
|
{ 53, 19, 236740 },
|
||
|
|
{ 27, 20, 473482 },
|
||
|
|
{ 28, 20, 473483 },
|
||
|
|
{ 29, 20, 473484 },
|
||
|
|
{ 30, 20, 473485 },
|
||
|
|
{ 31, 20, 473486 },
|
||
|
|
{ 32, 20, 473487 },
|
||
|
|
{ 33, 20, 473488 },
|
||
|
|
{ 34, 20, 473489 },
|
||
|
|
{ 35, 20, 473490 },
|
||
|
|
{ 36, 20, 473491 },
|
||
|
|
{ 37, 20, 473492 },
|
||
|
|
{ 38, 20, 473493 },
|
||
|
|
{ 39, 20, 473494 },
|
||
|
|
{ 40, 20, 473495 },
|
||
|
|
{ 41, 20, 473496 },
|
||
|
|
{ 42, 20, 473497 },
|
||
|
|
{ 43, 20, 473498 },
|
||
|
|
{ 44, 20, 473499 },
|
||
|
|
{ 45, 20, 473500 },
|
||
|
|
{ 46, 20, 473501 },
|
||
|
|
{ 47, 20, 473502 },
|
||
|
|
{ 48, 20, 473503 },
|
||
|
|
{ 99, 21, 0 } /* Shouldn't come this far */
|
||
|
|
};
|
||
|
|
|
||
|
|
static int8_t rvlc_huffman_sf(bitfile *ld_sf, bitfile *ld_esc,
|
||
|
|
int8_t direction)
|
||
|
|
{
|
||
|
|
uint8_t i, j;
|
||
|
|
int8_t index;
|
||
|
|
uint32_t cw;
|
||
|
|
rvlc_huff_table *h = book_rvlc;
|
||
|
|
|
||
|
|
i = h->len;
|
||
|
|
if (direction > 0)
|
||
|
|
cw = faad_getbits(ld_sf, i DEBUGVAR(1,0,""));
|
||
|
|
else
|
||
|
|
cw = faad_getbits_rev(ld_sf, i DEBUGVAR(1,0,""));
|
||
|
|
|
||
|
|
while ((cw != h->cw)
|
||
|
|
&& (i < 10))
|
||
|
|
{
|
||
|
|
h++;
|
||
|
|
j = h->len-i;
|
||
|
|
i += j;
|
||
|
|
cw <<= j;
|
||
|
|
if (direction > 0)
|
||
|
|
cw |= faad_getbits(ld_sf, j DEBUGVAR(1,0,""));
|
||
|
|
else
|
||
|
|
cw |= faad_getbits_rev(ld_sf, j DEBUGVAR(1,0,""));
|
||
|
|
}
|
||
|
|
|
||
|
|
index = h->index;
|
||
|
|
|
||
|
|
if (index == +ESC_VAL)
|
||
|
|
{
|
||
|
|
int8_t esc = rvlc_huffman_esc(ld_esc, direction);
|
||
|
|
if (esc == 99)
|
||
|
|
return 99;
|
||
|
|
index += esc;
|
||
|
|
#ifdef PRINT_RVLC
|
||
|
|
printf("esc: %d - ", esc);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
if (index == -ESC_VAL)
|
||
|
|
{
|
||
|
|
int8_t esc = rvlc_huffman_esc(ld_esc, direction);
|
||
|
|
if (esc == 99)
|
||
|
|
return 99;
|
||
|
|
index -= esc;
|
||
|
|
#ifdef PRINT_RVLC
|
||
|
|
printf("esc: %d - ", esc);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
return index;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int8_t rvlc_huffman_esc(bitfile *ld,
|
||
|
|
int8_t direction)
|
||
|
|
{
|
||
|
|
uint8_t i, j;
|
||
|
|
uint32_t cw;
|
||
|
|
rvlc_huff_table *h = book_escape;
|
||
|
|
|
||
|
|
i = h->len;
|
||
|
|
if (direction > 0)
|
||
|
|
cw = faad_getbits(ld, i DEBUGVAR(1,0,""));
|
||
|
|
else
|
||
|
|
cw = faad_getbits_rev(ld, i DEBUGVAR(1,0,""));
|
||
|
|
|
||
|
|
while ((cw != h->cw)
|
||
|
|
&& (i < 21))
|
||
|
|
{
|
||
|
|
h++;
|
||
|
|
j = h->len-i;
|
||
|
|
i += j;
|
||
|
|
cw <<= j;
|
||
|
|
if (direction > 0)
|
||
|
|
cw |= faad_getbits(ld, j DEBUGVAR(1,0,""));
|
||
|
|
else
|
||
|
|
cw |= faad_getbits_rev(ld, j DEBUGVAR(1,0,""));
|
||
|
|
}
|
||
|
|
|
||
|
|
return h->index;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|