Initial check-in of unmodified libfaad (part of the FAAD2 project). This is the last version of libfaad available under the GPL - the state of FAAD2 CVS at midnight on 2005-02-01

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7699 a1c6a512-1295-4272-9138-f99709370657

apps/codecs/libfaad/bits.c

@@ -0,0 +1,213 @@
+/*
+** 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.
+**
+** $Id$
+**/
+
+#include "common.h"
+#include "structs.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include "bits.h"
+
+/* initialize buffer, call once before first getbits or showbits */
+void faad_initbits(bitfile *ld, const void *_buffer, const uint32_t buffer_size)
+{
+    uint32_t tmp;
+
+    if (ld == NULL)
+        return;
+
+    memset(ld, 0, sizeof(bitfile));
+
+    if (buffer_size == 0 || _buffer == NULL)
+    {
+        ld->error = 1;
+        ld->no_more_reading = 1;
+        return;
+    }
+
+    ld->buffer = faad_malloc((buffer_size+12)*sizeof(uint8_t));
+    memset(ld->buffer, 0, (buffer_size+12)*sizeof(uint8_t));
+    memcpy(ld->buffer, _buffer, buffer_size*sizeof(uint8_t));
+
+    ld->buffer_size = buffer_size;
+
+    tmp = getdword((uint32_t*)ld->buffer);
+    ld->bufa = tmp;
+
+    tmp = getdword((uint32_t*)ld->buffer + 1);
+    ld->bufb = tmp;
+
+    ld->start = (uint32_t*)ld->buffer;
+    ld->tail = ((uint32_t*)ld->buffer + 2);
+
+    ld->bits_left = 32;
+
+    ld->bytes_used = 0;
+    ld->no_more_reading = 0;
+    ld->error = 0;
+}
+
+void faad_endbits(bitfile *ld)
+{
+    if (ld)
+    {
+        if (ld->buffer)
+        {
+            faad_free(ld->buffer);
+            ld->buffer = NULL;
+        }
+    }
+}
+
+uint32_t faad_get_processed_bits(bitfile *ld)
+{
+    return (uint32_t)(8 * (4*(ld->tail - ld->start) - 4) - (ld->bits_left));
+}
+
+uint8_t faad_byte_align(bitfile *ld)
+{
+    uint8_t remainder = (uint8_t)((32 - ld->bits_left) % 8);
+
+    if (remainder)
+    {
+        faad_flushbits(ld, 8 - remainder);
+        return (8 - remainder);
+    }
+    return 0;
+}
+
+void faad_flushbits_ex(bitfile *ld, uint32_t bits)
+{
+    uint32_t tmp;
+
+    ld->bufa = ld->bufb;
+    if (ld->no_more_reading == 0)
+    {
+        tmp = getdword(ld->tail);
+        ld->tail++;
+    } else {
+        tmp = 0;
+    }
+    ld->bufb = tmp;
+    ld->bits_left += (32 - bits);
+    ld->bytes_used += 4;
+    if (ld->bytes_used == ld->buffer_size)
+        ld->no_more_reading = 1;
+    if (ld->bytes_used > ld->buffer_size)
+        ld->error = 1;
+}
+
+/* rewind to beginning */
+void faad_rewindbits(bitfile *ld)
+{
+    uint32_t tmp;
+
+    tmp = ld->start[0];
+#ifndef ARCH_IS_BIG_ENDIAN
+    BSWAP(tmp);
+#endif
+    ld->bufa = tmp;
+
+    tmp = ld->start[1];
+#ifndef ARCH_IS_BIG_ENDIAN
+    BSWAP(tmp);
+#endif
+    ld->bufb = tmp;
+    ld->bits_left = 32;
+    ld->tail = &ld->start[2];
+    ld->bytes_used = 0;
+    ld->no_more_reading = 0;
+}
+
+uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits
+                       DEBUGDEC)
+{
+    uint16_t i;
+    uint8_t temp;
+    uint16_t bytes = (uint16_t)bits / 8;
+    uint8_t remainder = (uint8_t)bits % 8;
+
+    uint8_t *buffer = (uint8_t*)faad_malloc((bytes+1)*sizeof(uint8_t));
+
+    for (i = 0; i < bytes; i++)
+    {
+        buffer[i] = (uint8_t)faad_getbits(ld, 8 DEBUGVAR(print,var,dbg));
+    }
+
+    if (remainder)
+    {
+        temp = (uint8_t)faad_getbits(ld, remainder DEBUGVAR(print,var,dbg)) << (8-remainder);
+
+        buffer[bytes] = temp;
+    }
+
+    return buffer;
+}
+
+#ifdef DRM
+/* return the original data buffer */
+void *faad_origbitbuffer(bitfile *ld)
+{
+    return (void*)ld->start;
+}
+
+/* return the original data buffer size */
+uint32_t faad_origbitbuffer_size(bitfile *ld)
+{
+    return ld->buffer_size;
+}
+#endif
+
+/* reversed bit reading routines, used for RVLC and HCR */
+void faad_initbits_rev(bitfile *ld, void *buffer,
+                       uint32_t bits_in_buffer)
+{
+    uint32_t tmp;
+    int32_t index;
+
+    ld->buffer_size = bit2byte(bits_in_buffer);
+
+    index = (bits_in_buffer+31)/32 - 1;
+
+    ld->start = (uint32_t*)buffer + index - 2;
+
+    tmp = getdword((uint32_t*)buffer + index);
+    ld->bufa = tmp;
+
+    tmp = getdword((uint32_t*)buffer + index - 1);
+    ld->bufb = tmp;
+
+    ld->tail = (uint32_t*)buffer + index;
+
+    ld->bits_left = bits_in_buffer % 32;
+    if (ld->bits_left == 0)
+        ld->bits_left = 32;
+
+    ld->bytes_used = 0;
+    ld->no_more_reading = 0;
+    ld->error = 0;
+}