diff options
Diffstat (limited to 'faad2/src/libfaad/rvlc.c')
| -rw-r--r-- | faad2/src/libfaad/rvlc.c | 533 |
1 files changed, 0 insertions, 533 deletions
diff --git a/faad2/src/libfaad/rvlc.c b/faad2/src/libfaad/rvlc.c deleted file mode 100644 index 3ce25ec..0000000 --- a/faad2/src/libfaad/rvlc.c +++ /dev/null @@ -1,533 +0,0 @@ -/*
-** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
-** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
-**
-** 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.
-**
-** Any non-GPL usage of this software or parts of this software is strictly
-** forbidden.
-**
-** The "appropriate copyright message" mentioned in section 2c of the GPLv2
-** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
-**
-** Commercial non-GPL licensing of this software is possible.
-** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
-**
-** $Id: rvlc.c,v 1.21 2007/11/01 12:33:34 menno Exp $
-**/
-
-/* RVLC scalefactor decoding
- *
- * RVLC works like this:
- * 1. Only symmetric huffman codewords are used
- * 2. Total length of the scalefactor data is stored in the bitsream
- * 3. Scalefactors are DPCM coded
- * 4. Next to the starting value for DPCM the ending value is also stored
- *
- * With all this it is possible to read the scalefactor data from 2 sides.
- * If there is a bit error in the scalefactor data it is possible to start
- * decoding from the other end of the data, to find all but 1 scalefactor.
- */
-
-#include "common.h"
-#include "structs.h"
-
-#include <stdlib.h>
-
-#include "syntax.h"
-#include "bits.h"
-#include "rvlc.h"
-
-
-#ifdef ERROR_RESILIENCE
-
-//#define PRINT_RVLC
-
-/* static function declarations */
-static uint8_t rvlc_decode_sf_forward(ic_stream *ics,
- bitfile *ld_sf,
- bitfile *ld_esc,
- uint8_t *is_used);
-#if 0
-static uint8_t rvlc_decode_sf_reverse(ic_stream *ics,
- bitfile *ld_sf,
- bitfile *ld_esc,
- uint8_t is_used);
-#endif
-static int8_t rvlc_huffman_sf(bitfile *ld_sf, bitfile *ld_esc,
- int8_t direction);
-static int8_t rvlc_huffman_esc(bitfile *ld_esc, int8_t direction);
-
-
-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 = (uint8_t)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 = (uint16_t)faad_getbits(ld, bits
- DEBUGVAR(1,151,"rvlc_scale_factor_data(): length_of_rvlc_sf"));
-
- if (ics->noise_used)
- {
- ics->dpcm_noise_nrg = (uint16_t)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 = (uint8_t)faad_getbits(ld, 8
- DEBUGVAR(1,154,"rvlc_scale_factor_data(): length_of_rvlc_escapes"));
- }
-
- if (ics->noise_used)
- {
- ics->dpcm_noise_last_position = (uint16_t)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 intensity_used = 0;
- uint8_t *rvlc_sf_buffer = NULL;
- uint8_t *rvlc_esc_buffer = NULL;
- bitfile ld_rvlc_sf, ld_rvlc_esc;
-// bitfile ld_rvlc_sf_rev, ld_rvlc_esc_rev;
-
- 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, bit2byte(ics->length_of_rvlc_sf));
-// faad_initbits_rev(&ld_rvlc_sf_rev, (void*)rvlc_sf_buffer,
-// ics->length_of_rvlc_sf);
- }
-
- 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, bit2byte(ics->length_of_rvlc_escapes));
-// faad_initbits_rev(&ld_rvlc_esc_rev, (void*)rvlc_esc_buffer,
-// ics->length_of_rvlc_escapes);
- }
-
- /* decode the rvlc scale factors and escapes */
- result = rvlc_decode_sf_forward(ics, &ld_rvlc_sf,
- &ld_rvlc_esc, &intensity_used);
-// result = rvlc_decode_sf_reverse(ics, &ld_rvlc_sf_rev,
-// &ld_rvlc_esc_rev, intensity_used);
-
-
- if (rvlc_esc_buffer) faad_free(rvlc_esc_buffer);
- if (rvlc_sf_buffer) faad_free(rvlc_sf_buffer);
-
- if (ics->length_of_rvlc_sf > 0)
- faad_endbits(&ld_rvlc_sf);
- if (ics->sf_escapes_present)
- faad_endbits(&ld_rvlc_esc);
-
- return result;
-}
-
-static uint8_t rvlc_decode_sf_forward(ic_stream *ics, bitfile *ld_sf, bitfile *ld_esc,
- uint8_t *intensity_used)
-{
- int8_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 - 256;
-
-#ifdef PRINT_RVLC
- printf("\nglobal_gain: %d\n", ics->global_gain);
-#endif
-
- 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:
-
- *intensity_used = 1;
-
- /* decode intensity position */
- t = rvlc_huffman_sf(ld_sf, ld_esc, +1);
-
- is_position += t;
- ics->scale_factors[g][sfb] = is_position;
-
- break;
- case NOISE_HCB: /* noise books */
-
- /* decode noise energy */
- if (noise_pcm_flag)
- {
- int16_t n = ics->dpcm_noise_nrg;
- noise_pcm_flag = 0;
- noise_energy += n;
- } else {
- t = rvlc_huffman_sf(ld_sf, ld_esc, +1);
- noise_energy += t;
- }
-
- ics->scale_factors[g][sfb] = noise_energy;
-
- break;
- default: /* spectral books */
-
- /* decode scale factor */
- t = rvlc_huffman_sf(ld_sf, ld_esc, +1);
-
- scale_factor += t;
- if (scale_factor < 0)
- return 4;
-
- ics->scale_factors[g][sfb] = scale_factor;
-
- break;
- }
-#ifdef PRINT_RVLC
- printf("%3d:%4d%4d\n", sfb, ics->sfb_cb[g][sfb],
- ics->scale_factors[g][sfb]);
-#endif
- if (t == 99)
- {
- error = 1;
- }
- }
- }
- }
-#ifdef PRINT_RVLC
- printf("\n\n");
-#endif
-
- return 0;
-}
-
-#if 0 // not used right now, doesn't work correctly yet
-static uint8_t rvlc_decode_sf_reverse(ic_stream *ics, bitfile *ld_sf, bitfile *ld_esc,
- uint8_t intensity_used)
-{
- int8_t g, sfb;
- int8_t t = 0;
- int8_t error = 0;
- int8_t noise_pcm_flag = 1, is_pcm_flag = 1, sf_pcm_flag = 1;
-
- int16_t scale_factor = ics->rev_global_gain;
- int16_t is_position = 0;
- int16_t noise_energy = ics->rev_global_gain;
-
-#ifdef PRINT_RVLC
- printf("\nrev_global_gain: %d\n", ics->rev_global_gain);
-#endif
-
- if (intensity_used)
- {
- is_position = rvlc_huffman_sf(ld_sf, ld_esc, -1);
-#ifdef PRINT_RVLC
- printf("is_position: %d\n", is_position);
-#endif
- }
-
- for (g = ics->num_window_groups-1; g >= 0; g--)
- {
- for (sfb = ics->max_sfb-1; sfb >= 0; 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:
-
- if (is_pcm_flag)
- {
- is_pcm_flag = 0;
- ics->scale_factors[g][sfb] = is_position;
- } else {
- t = rvlc_huffman_sf(ld_sf, ld_esc, -1);
- is_position -= t;
-
- ics->scale_factors[g][sfb] = (uint8_t)is_position;
- }
- break;
- case NOISE_HCB: /* noise books */
-
- /* decode noise energy */
- if (noise_pcm_flag)
- {
- noise_pcm_flag = 0;
- noise_energy = ics->dpcm_noise_last_position;
- } else {
- t = rvlc_huffman_sf(ld_sf, ld_esc, -1);
- noise_energy -= t;
- }
-
- ics->scale_factors[g][sfb] = (uint8_t)noise_energy;
- break;
- default: /* spectral books */
-
- if (sf_pcm_flag || (sfb == 0))
- {
- sf_pcm_flag = 0;
- if (sfb == 0)
- scale_factor = ics->global_gain;
- } else {
- /* decode scale factor */
- t = rvlc_huffman_sf(ld_sf, ld_esc, -1);
- scale_factor -= t;
- }
-
- if (scale_factor < 0)
- return 4;
-
- ics->scale_factors[g][sfb] = (uint8_t)scale_factor;
- break;
- }
-#ifdef PRINT_RVLC
- printf("%3d:%4d%4d\n", sfb, ics->sfb_cb[g][sfb],
- ics->scale_factors[g][sfb]);
-#endif
- if (t == 99)
- {
- error = 1;
- }
- }
- }
- }
-
-#ifdef PRINT_RVLC
- printf("\n\n");
-#endif
-
- return 0;
-}
-#endif
-
-/* 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,
- 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
-
|