1 files changed, 530 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libfaad/rvlc.c b/lib/rbcodec/codecs/libfaad/rvlc.c
new file mode 100644
index 0000000000..5b17edd06c
--- /dev/null
+++ b/lib/rbcodec/codecs/libfaad/rvlc.c
@@ -0,0 +1,530 @@
+/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2004 M. Bakker, Ahead Software 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.
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
+**
+** $Id$
+**/
+
+/* 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
+