1 files changed, 341 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libwmavoice/bitstream.c b/lib/rbcodec/codecs/libwmavoice/bitstream.c
new file mode 100644
index 0000000000..d408f66650
--- /dev/null
+++ b/lib/rbcodec/codecs/libwmavoice/bitstream.c
@@ -0,0 +1,341 @@
+/*
+ * Common bit i/o utils
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2010 Loren Merritt
+ *
+ * alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * bitstream api.
+ */
+
+#include "avcodec.h"
+#include "get_bits.h"
+#include "put_bits.h"
+
+const uint8_t ff_log2_run[32]={
+ 0, 0, 0, 0, 1, 1, 1, 1,
+ 2, 2, 2, 2, 3, 3, 3, 3,
+ 4, 4, 5, 5, 6, 6, 7, 7,
+ 8, 9,10,11,12,13,14,15
+};
+
+void align_put_bits(PutBitContext *s)
+{
+#ifdef ALT_BITSTREAM_WRITER
+    put_bits(s,(  - s->index) & 7,0);
+#else
+    put_bits(s,s->bit_left & 7,0);
+#endif
+}
+
+void ff_put_string(PutBitContext *pb, const char *string, int terminate_string)
+{
+    while(*string){
+        put_bits(pb, 8, *string);
+        string++;
+    }
+    if(terminate_string)
+        put_bits(pb, 8, 0);
+}
+
+void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
+{
+    int words= length>>4;
+    int bits= length&15;
+    int i;
+
+    if(length==0) return;
+
+    if(/*CONFIG_SMALL ||*/ words < 16 || put_bits_count(pb)&7){
+        for(i=0; i<words; i++) put_bits(pb, 16, AV_RB16(src + 2*i));
+    }else{
+        for(i=0; put_bits_count(pb)&31; i++)
+            put_bits(pb, 8, src[i]);
+        flush_put_bits(pb);
+        memcpy(put_bits_ptr(pb), src+i, 2*words-i);
+        skip_put_bytes(pb, 2*words-i);
+    }
+
+    put_bits(pb, bits, AV_RB16(src + 2*words)>>(16-bits));
+}
+
+/* VLC decoding */
+
+//#define DEBUG_VLC
+
+#define GET_DATA(v, table, i, wrap, size) \
+{\
+    const uint8_t *ptr = (const uint8_t *)table + i * wrap;\
+    switch(size) {\
+    case 1:\
+        v = *(const uint8_t *)ptr;\
+        break;\
+    case 2:\
+        v = *(const uint16_t *)ptr;\
+        break;\
+    default:\
+        v = *(const uint32_t *)ptr;\
+        break;\
+    }\
+}
+
+
+static int alloc_table(VLC *vlc, int size, int use_static)
+{
+    int index;
+    index = vlc->table_size;
+    vlc->table_size += size;
+    if (vlc->table_size > vlc->table_allocated) {
+        if(use_static)
+            abort(); //cant do anything, init_vlc() is used with too little memory
+        vlc->table_allocated += (1 << vlc->bits);
+        vlc->table = av_realloc(vlc->table,
+                                sizeof(VLC_TYPE) * 2 * vlc->table_allocated);
+        if (!vlc->table)
+            return -1;
+    }
+    return index;
+}
+
+static av_always_inline uint32_t bitswap_32(uint32_t x) {
+    return av_reverse[x&0xFF]<<24
+         | av_reverse[(x>>8)&0xFF]<<16
+         | av_reverse[(x>>16)&0xFF]<<8
+         | av_reverse[x>>24];
+}
+
+typedef struct {
+    uint8_t bits;
+    uint16_t symbol;
+    /** codeword, with the first bit-to-be-read in the msb
+     * (even if intended for a little-endian bitstream reader) */
+    uint32_t code;
+} VLCcode;
+
+static int compare_vlcspec(const void *a, const void *b)
+{
+    const VLCcode *sa=a, *sb=b;
+    return (sa->code >> 1) - (sb->code >> 1);
+}
+
+/**
+ * Build VLC decoding tables suitable for use with get_vlc().
+ *
+ * @param vlc            the context to be initted
+ *
+ * @param table_nb_bits  max length of vlc codes to store directly in this table
+ *                       (Longer codes are delegated to subtables.)
+ *
+ * @param nb_codes       number of elements in codes[]
+ *
+ * @param codes          descriptions of the vlc codes
+ *                       These must be ordered such that codes going into the same subtable are contiguous.
+ *                       Sorting by VLCcode.code is sufficient, though not necessary.
+ */
+static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
+                       VLCcode *codes, int flags)
+{
+    int table_size, table_index, index, code_prefix, symbol, subtable_bits;
+    int i, j, k, n, nb, inc;
+    uint32_t code;
+    VLC_TYPE (*table)[2];
+
+    table_size = 1 << table_nb_bits;
+    table_index = alloc_table(vlc, table_size, flags & INIT_VLC_USE_NEW_STATIC);
+#ifdef DEBUG_VLC
+    av_log(NULL,AV_LOG_DEBUG,"new table index=%d size=%d\n",
+           table_index, table_size);
+#endif
+    if (table_index < 0)
+        return -1;
+    table = &vlc->table[table_index];
+
+    for (i = 0; i < table_size; i++) {
+        table[i][1] = 0; //bits
+        table[i][0] = -1; //codes
+    }
+
+    /* first pass: map codes and compute auxillary table sizes */
+    for (i = 0; i < nb_codes; i++) {
+        n = codes[i].bits;
+        code = codes[i].code;
+        symbol = codes[i].symbol;
+#if defined(DEBUG_VLC) && 0
+        av_log(NULL,AV_LOG_DEBUG,"i=%d n=%d code=0x%x\n", i, n, code);
+#endif
+        if (n <= table_nb_bits) {
+            /* no need to add another table */
+            j = code >> (32 - table_nb_bits);
+            nb = 1 << (table_nb_bits - n);
+            inc = 1;
+            if (flags & INIT_VLC_LE) {
+                j = bitswap_32(code);
+                inc = 1 << n;
+            }
+            for (k = 0; k < nb; k++) {
+#ifdef DEBUG_VLC
+                av_log(NULL, AV_LOG_DEBUG, "%4x: code=%d n=%d\n",
+                       j, i, n);
+#endif
+                if (table[j][1] /*bits*/ != 0) {
+                    av_log(NULL, AV_LOG_ERROR, "incorrect codes\n");
+                    return -1;
+                }
+                table[j][1] = n; //bits
+                table[j][0] = symbol;
+                j += inc;
+            }
+        } else {
+            /* fill auxiliary table recursively */
+            n -= table_nb_bits;
+            code_prefix = code >> (32 - table_nb_bits);
+            subtable_bits = n;
+            codes[i].bits = n;
+            codes[i].code = code << table_nb_bits;
+            for (k = i+1; k < nb_codes; k++) {
+                n = codes[k].bits - table_nb_bits;
+                if (n <= 0)
+                    break;
+                code = codes[k].code;
+                if (code >> (32 - table_nb_bits) != code_prefix)
+                    break;
+                codes[k].bits = n;
+                codes[k].code = code << table_nb_bits;
+                subtable_bits = FFMAX(subtable_bits, n);
+            }
+            subtable_bits = FFMIN(subtable_bits, table_nb_bits);
+            j = (flags & INIT_VLC_LE) ? bitswap_32(code_prefix) >> (32 - table_nb_bits) : code_prefix;
+            table[j][1] = -subtable_bits;
+#ifdef DEBUG_VLC
+            av_log(NULL,AV_LOG_DEBUG,"%4x: n=%d (subtable)\n",
+                   j, codes[i].bits + table_nb_bits);
+#endif
+            index = build_table(vlc, subtable_bits, k-i, codes+i, flags);
+            if (index < 0)
+                return -1;
+            /* note: realloc has been done, so reload tables */
+            table = &vlc->table[table_index];
+            table[j][0] = index; //code
+            i = k-1;
+        }
+    }
+    return table_index;
+}
+
+
+/* Build VLC decoding tables suitable for use with get_vlc().
+
+   'nb_bits' set thee decoding table size (2^nb_bits) entries. The
+   bigger it is, the faster is the decoding. But it should not be too
+   big to save memory and L1 cache. '9' is a good compromise.
+
+   'nb_codes' : number of vlcs codes
+
+   'bits' : table which gives the size (in bits) of each vlc code.
+
+   'codes' : table which gives the bit pattern of of each vlc code.
+
+   'symbols' : table which gives the values to be returned from get_vlc().
+
+   'xxx_wrap' : give the number of bytes between each entry of the
+   'bits' or 'codes' tables.
+
+   'xxx_size' : gives the number of bytes of each entry of the 'bits'
+   or 'codes' tables.
+
+   'wrap' and 'size' allows to use any memory configuration and types
+   (byte/word/long) to store the 'bits', 'codes', and 'symbols' tables.
+
+   'use_static' should be set to 1 for tables, which should be freed
+   with av_free_static(), 0 if free_vlc() will be used.
+*/
+int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
+             const void *bits, int bits_wrap, int bits_size,
+             const void *codes, int codes_wrap, int codes_size,
+             const void *symbols, int symbols_wrap, int symbols_size,
+             int flags)
+{
+    VLCcode *buf;
+    int i, j, ret;
+
+    vlc->bits = nb_bits;
+    if(flags & INIT_VLC_USE_NEW_STATIC){
+        if(vlc->table_size && vlc->table_size == vlc->table_allocated){
+            return 0;
+        }else if(vlc->table_size){
+            abort(); // fatal error, we are called on a partially initialized table
+        }
+    }else {
+        vlc->table = NULL;
+        vlc->table_allocated = 0;
+        vlc->table_size = 0;
+    }
+
+#ifdef DEBUG_VLC
+    av_log(NULL,AV_LOG_DEBUG,"build table nb_codes=%d\n", nb_codes);
+#endif
+
+    buf = av_malloc((nb_codes+1)*sizeof(VLCcode));
+
+    assert(symbols_size <= 2 || !symbols);
+    j = 0;
+#define COPY(condition)\
+    for (i = 0; i < nb_codes; i++) {\
+        GET_DATA(buf[j].bits, bits, i, bits_wrap, bits_size);\
+        if (!(condition))\
+            continue;\
+        GET_DATA(buf[j].code, codes, i, codes_wrap, codes_size);\
+        if (flags & INIT_VLC_LE)\
+            buf[j].code = bitswap_32(buf[j].code);\
+        else\
+            buf[j].code <<= 32 - buf[j].bits;\
+        if (symbols)\
+            GET_DATA(buf[j].symbol, symbols, i, symbols_wrap, symbols_size)\
+        else\
+            buf[j].symbol = i;\
+        j++;\
+    }
+    COPY(buf[j].bits > nb_bits);
+    // qsort is the slowest part of init_vlc, and could probably be improved or avoided
+    qsort(buf, j, sizeof(VLCcode), compare_vlcspec);
+    COPY(buf[j].bits && buf[j].bits <= nb_bits);
+    nb_codes = j;
+
+    ret = build_table(vlc, nb_bits, nb_codes, buf, flags);
+
+    av_free(buf);
+    if (ret < 0) {
+        av_freep(&vlc->table);
+        return -1;
+    }
+    if((flags & INIT_VLC_USE_NEW_STATIC) && vlc->table_size != vlc->table_allocated)
+        av_log(NULL, AV_LOG_ERROR, "needed %d had %d\n", vlc->table_size, vlc->table_allocated);
+    return 0;
+}
+
+
+void free_vlc(VLC *vlc)
+{
+    av_freep(&vlc->table);
+}
+