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Diffstat (limited to 'src/libfaad/rvlc_scale_factors.c')
| -rw-r--r-- | src/libfaad/rvlc_scale_factors.c | 339 |
1 files changed, 0 insertions, 339 deletions
diff --git a/src/libfaad/rvlc_scale_factors.c b/src/libfaad/rvlc_scale_factors.c deleted file mode 100644 index 4a399c43c..000000000 --- a/src/libfaad/rvlc_scale_factors.c +++ /dev/null @@ -1,339 +0,0 @@ -/* -** FAAD - Freeware Advanced Audio Decoder -** Copyright (C) 2002 M. Bakker -** -** This program is free software; you can redistribute it and/or modify -** it under the terms of the GNU General Public License as published by -** the Free Software Foundation; either version 2 of the License, or -** (at your option) any later version. -** -** This program is distributed in the hope that it will be useful, -** but WITHOUT ANY WARRANTY; without even the implied warranty of -** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -** GNU General Public License for more details. -** -** You should have received a copy of the GNU General Public License -** along with this program; if not, write to the Free Software -** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. -** -** $Id: rvlc_scale_factors.c,v 1.1 2002/08/09 22:36:36 miguelfreitas Exp $ -**/ - -#include "common.h" -#include <stdlib.h> -#include "syntax.h" -#include "bits.h" -#include "rvlc_scale_factors.h" - - -#ifdef ERROR_RESILIENCE - -uint8_t rvlc_scale_factor_data(ic_stream *ics, bitfile *ld) -{ - uint8_t bits = 9; - - ics->sf_concealment = faad_get1bit(ld - DEBUGVAR(1,149,"rvlc_scale_factor_data(): sf_concealment")); - ics->rev_global_gain = faad_getbits(ld, 8 - DEBUGVAR(1,150,"rvlc_scale_factor_data(): rev_global_gain")); - - if (ics->window_sequence == EIGHT_SHORT_SEQUENCE) - bits = 11; - - /* the number of bits used for the huffman codewords */ - ics->length_of_rvlc_sf = faad_getbits(ld, bits - DEBUGVAR(1,151,"rvlc_scale_factor_data(): length_of_rvlc_sf")); - - if (ics->noise_used) - { - ics->dpcm_noise_nrg = faad_getbits(ld, 9 - DEBUGVAR(1,152,"rvlc_scale_factor_data(): dpcm_noise_nrg")); - - ics->length_of_rvlc_sf -= 9; - } - - ics->sf_escapes_present = faad_get1bit(ld - DEBUGVAR(1,153,"rvlc_scale_factor_data(): sf_escapes_present")); - - if (ics->sf_escapes_present) - { - ics->length_of_rvlc_escapes = faad_getbits(ld, 8 - DEBUGVAR(1,154,"rvlc_scale_factor_data(): length_of_rvlc_escapes")); - } - - if (ics->noise_used) - { - ics->dpcm_noise_last_position = faad_getbits(ld, 9 - DEBUGVAR(1,155,"rvlc_scale_factor_data(): dpcm_noise_last_position")); - } - - return 0; -} - -uint8_t rvlc_decode_scale_factors(ic_stream *ics, bitfile *ld) -{ - uint8_t result; - uint8_t *rvlc_sf_buffer = NULL; - uint8_t *rvlc_esc_buffer = NULL; - bitfile ld_rvlc_sf; - bitfile ld_rvlc_esc; - - if (ics->length_of_rvlc_sf > 0) - { - /* We read length_of_rvlc_sf bits here to put it in a - seperate bitfile. - */ - rvlc_sf_buffer = faad_getbitbuffer(ld, ics->length_of_rvlc_sf - DEBUGVAR(1,156,"rvlc_decode_scale_factors(): bitbuffer: length_of_rvlc_sf")); - - faad_initbits(&ld_rvlc_sf, (void*)rvlc_sf_buffer); - } - - if (ics->sf_escapes_present) - { - /* We read length_of_rvlc_escapes bits here to put it in a - seperate bitfile. - */ - rvlc_esc_buffer = faad_getbitbuffer(ld, ics->length_of_rvlc_escapes - DEBUGVAR(1,157,"rvlc_decode_scale_factors(): bitbuffer: length_of_rvlc_escapes")); - - faad_initbits(&ld_rvlc_esc, (void*)rvlc_esc_buffer); - } - - /* decode the rvlc scale factors and escapes */ - result = rvlc_decode_sf_forward(ics, &ld_rvlc_sf, &ld_rvlc_esc); - - - if (rvlc_esc_buffer) free(rvlc_esc_buffer); - if (rvlc_sf_buffer) free(rvlc_sf_buffer); - - return result; -} - -static uint8_t rvlc_decode_sf_forward(ic_stream *ics, bitfile *ld_sf, bitfile *ld_esc) -{ - uint8_t g, sfb; - int8_t t = 0; - int8_t error = 0; - int8_t noise_pcm_flag = 1; - - int16_t scale_factor = ics->global_gain; - int16_t is_position = 0; - int16_t noise_energy = ics->global_gain - 90; - - for (g = 0; g < ics->num_window_groups; g++) - { - for (sfb = 0; sfb < ics->max_sfb; sfb++) - { - if (error) - { - ics->scale_factors[g][sfb] = 0; - } else { - switch (ics->sfb_cb[g][sfb]) - { - case ZERO_HCB: /* zero book */ - ics->scale_factors[g][sfb] = 0; - break; - case INTENSITY_HCB: /* intensity books */ - case INTENSITY_HCB2: - - /* decode intensity position */ - t = rvlc_huffman_sf(ld_sf, ld_esc); - - is_position += t; - ics->scale_factors[g][sfb] = is_position; - - break; - case NOISE_HCB: /* noise books */ - - /* decode noise energy */ - if (noise_pcm_flag) - { - int8_t n = ics->dpcm_noise_nrg; - noise_pcm_flag = 0; - noise_energy += n; - } else { - t = rvlc_huffman_sf(ld_sf, ld_esc); - noise_energy += t; - } - - ics->scale_factors[g][sfb] = noise_energy; - - break; - case BOOKSCL: /* invalid books */ - return 3; - default: /* spectral books */ - - /* decode scale factor */ - t = rvlc_huffman_sf(ld_sf, ld_esc); - - scale_factor += t; - if (scale_factor < 0) - return 4; - - ics->scale_factors[g][sfb] = scale_factor; - - break; - } - if (t == 99) - { - error = 1; - } - } - } - } - - return 0; -} - -/* index == 99 means not allowed codeword */ -static rvlc_huff_table book_rvlc[] = { - /*index length codeword */ - { 0, 1, 0 }, /* 0 */ - { -1, 3, 5 }, /* 101 */ - { 1, 3, 7 }, /* 111 */ - { -2, 4, 9 }, /* 1001 */ - { -3, 5, 17 }, /* 10001 */ - { 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) -{ - uint8_t i, j; - int8_t index; - uint32_t cw; - rvlc_huff_table *h = book_rvlc; - - i = h->len; - cw = faad_getbits(ld_sf, i); - - while ((cw != h->cw) - && (i < 10)) - { - h++; - j = h->len-i; - i += j; - cw <<= j; - cw |= faad_getbits(ld_sf, j); - } - - index = h->index; - - if (index == +ESC_VAL) - { - int8_t esc = rvlc_huffman_esc(ld_esc); - if (esc == 99) - return 99; - index += esc; - } - if (index == -ESC_VAL) - { - int8_t esc = rvlc_huffman_esc(ld_esc); - if (esc == 99) - return 99; - index -= esc; - } - - return index; -} - -static int8_t rvlc_huffman_esc(bitfile *ld) -{ - uint8_t i, j; - uint32_t cw; - rvlc_huff_table *h = book_escape; - - i = h->len; - cw = faad_getbits(ld, i); - - while ((cw != h->cw) - && (i < 21)) - { - h++; - j = h->len-i; - i += j; - cw <<= j; - cw |= faad_getbits(ld, j); - } - - return h->index; -} - -#endif
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