363 lines
13 KiB
C
363 lines
13 KiB
C
|
/*
|
||
|
|
* 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 "libavutil/avassert.h"
|
||
|
|
#include "libavutil/qsort.h"
|
||
|
|
#include "avcodec.h"
|
||
|
|
#include "internal.h"
|
||
|
|
#include "mathops.h"
|
||
|
|
#include "put_bits.h"
|
||
|
|
#include "vlc.h"
|
||
|
|
|
||
|
|
const uint8_t ff_log2_run[41]={
|
||
|
|
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,
|
||
|
|
16,17,18,19,20,21,22,23,
|
||
|
|
24,
|
||
|
|
};
|
||
|
|
|
||
|
|
void avpriv_align_put_bits(PutBitContext *s)
|
||
|
|
{
|
||
|
|
put_bits(s, s->bit_left & 7, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void avpriv_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 avpriv_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
|
||
|
|
{
|
||
|
|
int words = length >> 4;
|
||
|
|
int bits = length & 15;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (length == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
av_assert0(length <= put_bits_left(pb));
|
||
|
|
|
||
|
|
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 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; \
|
||
|
|
case 4: \
|
||
|
|
v = *(const uint32_t *)ptr; \
|
||
|
|
break; \
|
||
|
|
default: \
|
||
|
|
av_assert1(0); \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static int alloc_table(VLC *vlc, int size, int use_static)
|
||
|
|
{
|
||
|
|
int index = vlc->table_size;
|
||
|
|
|
||
|
|
vlc->table_size += size;
|
||
|
|
if (vlc->table_size > vlc->table_allocated) {
|
||
|
|
if (use_static)
|
||
|
|
abort(); // cannot do anything, init_vlc() is used with too little memory
|
||
|
|
vlc->table_allocated += (1 << vlc->bits);
|
||
|
|
vlc->table = av_realloc_f(vlc->table, vlc->table_allocated, sizeof(VLC_TYPE) * 2);
|
||
|
|
if (!vlc->table) {
|
||
|
|
vlc->table_allocated = 0;
|
||
|
|
vlc->table_size = 0;
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
memset(vlc->table + vlc->table_allocated - (1 << vlc->bits), 0, sizeof(VLC_TYPE) * 2 << vlc->bits);
|
||
|
|
}
|
||
|
|
return index;
|
||
|
|
}
|
||
|
|
|
||
|
|
typedef struct VLCcode {
|
||
|
|
uint8_t bits;
|
||
|
|
VLC_TYPE 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 initialized
|
||
|
|
*
|
||
|
|
* @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;
|
||
|
|
volatile VLC_TYPE (* volatile table)[2]; // the double volatile is needed to prevent an internal compiler error in gcc 4.2
|
||
|
|
|
||
|
|
if (table_nb_bits > 30)
|
||
|
|
return AVERROR(EINVAL);
|
||
|
|
table_size = 1 << table_nb_bits;
|
||
|
|
table_index = alloc_table(vlc, table_size, flags & INIT_VLC_USE_NEW_STATIC);
|
||
|
|
ff_dlog(NULL, "new table index=%d size=%d\n", table_index, table_size);
|
||
|
|
if (table_index < 0)
|
||
|
|
return table_index;
|
||
|
|
table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index];
|
||
|
|
|
||
|
|
/* first pass: map codes and compute auxiliary table sizes */
|
||
|
|
for (i = 0; i < nb_codes; i++) {
|
||
|
|
n = codes[i].bits;
|
||
|
|
code = codes[i].code;
|
||
|
|
symbol = codes[i].symbol;
|
||
|
|
ff_dlog(NULL, "i=%d n=%d code=0x%"PRIx32"\n", i, n, code);
|
||
|
|
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++) {
|
||
|
|
int bits = table[j][1];
|
||
|
|
int oldsym = table[j][0];
|
||
|
|
ff_dlog(NULL, "%4x: code=%d n=%d\n", j, i, n);
|
||
|
|
if ((bits || oldsym) && (bits != n || oldsym != symbol)) {
|
||
|
|
av_log(NULL, AV_LOG_ERROR, "incorrect codes\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
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;
|
||
|
|
ff_dlog(NULL, "%4x: n=%d (subtable)\n",
|
||
|
|
j, codes[i].bits + table_nb_bits);
|
||
|
|
index = build_table(vlc, subtable_bits, k-i, codes+i, flags);
|
||
|
|
if (index < 0)
|
||
|
|
return index;
|
||
|
|
/* note: realloc has been done, so reload tables */
|
||
|
|
table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index];
|
||
|
|
table[j][0] = index; //code
|
||
|
|
if (table[j][0] != index) {
|
||
|
|
avpriv_request_sample(NULL, "strange codes");
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
i = k-1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < table_size; i++) {
|
||
|
|
if (table[i][1] == 0) //bits
|
||
|
|
table[i][0] = -1; //codes
|
||
|
|
}
|
||
|
|
|
||
|
|
return table_index;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Build VLC decoding tables suitable for use with get_vlc().
|
||
|
|
|
||
|
|
'nb_bits' sets the 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. Currently 1,2 and 4 are supported.
|
||
|
|
|
||
|
|
'wrap' and 'size' make it possible 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 ff_free_vlc() will be used.
|
||
|
|
*/
|
||
|
|
int ff_init_vlc_sparse(VLC *vlc_arg, 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;
|
||
|
|
VLCcode localbuf[1500]; // the maximum currently needed is 1296 by rv34
|
||
|
|
VLC localvlc, *vlc;
|
||
|
|
|
||
|
|
vlc = vlc_arg;
|
||
|
|
vlc->bits = nb_bits;
|
||
|
|
if (flags & INIT_VLC_USE_NEW_STATIC) {
|
||
|
|
av_assert0(nb_codes + 1 <= FF_ARRAY_ELEMS(localbuf));
|
||
|
|
buf = localbuf;
|
||
|
|
localvlc = *vlc_arg;
|
||
|
|
vlc = &localvlc;
|
||
|
|
vlc->table_size = 0;
|
||
|
|
} else {
|
||
|
|
vlc->table = NULL;
|
||
|
|
vlc->table_allocated = 0;
|
||
|
|
vlc->table_size = 0;
|
||
|
|
|
||
|
|
buf = av_malloc_array((nb_codes + 1), sizeof(VLCcode));
|
||
|
|
if (!buf)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
av_assert0(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; \
|
||
|
|
if (buf[j].bits > 3*nb_bits || buf[j].bits>32) { \
|
||
|
|
av_log(NULL, AV_LOG_ERROR, "Too long VLC (%d) in init_vlc\n", buf[j].bits);\
|
||
|
|
if (!(flags & INIT_VLC_USE_NEW_STATIC)) \
|
||
|
|
av_free(buf); \
|
||
|
|
return AVERROR(EINVAL); \
|
||
|
|
} \
|
||
|
|
GET_DATA(buf[j].code, codes, i, codes_wrap, codes_size); \
|
||
|
|
if (buf[j].code >= (1LL<<buf[j].bits)) { \
|
||
|
|
av_log(NULL, AV_LOG_ERROR, "Invalid code %"PRIx32" for %d in " \
|
||
|
|
"init_vlc\n", buf[j].code, i); \
|
||
|
|
if (!(flags & INIT_VLC_USE_NEW_STATIC)) \
|
||
|
|
av_free(buf); \
|
||
|
|
return AVERROR(EINVAL); \
|
||
|
|
} \
|
||
|
|
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
|
||
|
|
AV_QSORT(buf, j, struct 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);
|
||
|
|
|
||
|
|
if (flags & INIT_VLC_USE_NEW_STATIC) {
|
||
|
|
if(vlc->table_size != vlc->table_allocated)
|
||
|
|
av_log(NULL, AV_LOG_ERROR, "needed %d had %d\n", vlc->table_size, vlc->table_allocated);
|
||
|
|
|
||
|
|
av_assert0(ret >= 0);
|
||
|
|
*vlc_arg = *vlc;
|
||
|
|
} else {
|
||
|
|
av_free(buf);
|
||
|
|
if (ret < 0) {
|
||
|
|
av_freep(&vlc->table);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void ff_free_vlc(VLC *vlc)
|
||
|
|
{
|
||
|
|
av_freep(&vlc->table);
|
||
|
|
}
|