148 lines
4.5 KiB
C
Executable File
148 lines
4.5 KiB
C
Executable File
/*
|
|
* 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
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#include "rl.h"
|
|
|
|
void ff_rl_free(RLTable *rl)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
av_freep(&rl->max_run[i]);
|
|
av_freep(&rl->max_level[i]);
|
|
av_freep(&rl->index_run[i]);
|
|
}
|
|
}
|
|
|
|
av_cold int ff_rl_init(RLTable *rl,
|
|
uint8_t static_store[2][2 * MAX_RUN + MAX_LEVEL + 3])
|
|
{
|
|
int8_t max_level[MAX_RUN + 1], max_run[MAX_LEVEL + 1];
|
|
uint8_t index_run[MAX_RUN + 1];
|
|
int last, run, level, start, end, i;
|
|
|
|
/* If table is static, we can quit if rl->max_level[0] is not NULL */
|
|
if (static_store && rl->max_level[0])
|
|
return 0;
|
|
|
|
/* compute max_level[], max_run[] and index_run[] */
|
|
for (last = 0; last < 2; last++) {
|
|
if (last == 0) {
|
|
start = 0;
|
|
end = rl->last;
|
|
} else {
|
|
start = rl->last;
|
|
end = rl->n;
|
|
}
|
|
|
|
memset(max_level, 0, MAX_RUN + 1);
|
|
memset(max_run, 0, MAX_LEVEL + 1);
|
|
memset(index_run, rl->n, MAX_RUN + 1);
|
|
for (i = start; i < end; i++) {
|
|
run = rl->table_run[i];
|
|
level = rl->table_level[i];
|
|
if (index_run[run] == rl->n)
|
|
index_run[run] = i;
|
|
if (level > max_level[run])
|
|
max_level[run] = level;
|
|
if (run > max_run[level])
|
|
max_run[level] = run;
|
|
}
|
|
if (static_store)
|
|
rl->max_level[last] = static_store[last];
|
|
else {
|
|
rl->max_level[last] = av_malloc(MAX_RUN + 1);
|
|
if (!rl->max_level[last])
|
|
goto fail;
|
|
}
|
|
memcpy(rl->max_level[last], max_level, MAX_RUN + 1);
|
|
if (static_store)
|
|
rl->max_run[last] = static_store[last] + MAX_RUN + 1;
|
|
else {
|
|
rl->max_run[last] = av_malloc(MAX_LEVEL + 1);
|
|
if (!rl->max_run[last])
|
|
goto fail;
|
|
}
|
|
memcpy(rl->max_run[last], max_run, MAX_LEVEL + 1);
|
|
if (static_store)
|
|
rl->index_run[last] = static_store[last] + MAX_RUN + MAX_LEVEL + 2;
|
|
else {
|
|
rl->index_run[last] = av_malloc(MAX_RUN + 1);
|
|
if (!rl->index_run[last])
|
|
goto fail;
|
|
}
|
|
memcpy(rl->index_run[last], index_run, MAX_RUN + 1);
|
|
}
|
|
return 0;
|
|
|
|
fail:
|
|
ff_rl_free(rl);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
|
|
{
|
|
int i, q;
|
|
VLC_TYPE table[1500][2] = {{0}};
|
|
VLC vlc = { .table = table, .table_allocated = static_size };
|
|
av_assert0(static_size <= FF_ARRAY_ELEMS(table));
|
|
init_vlc(&vlc, 9, rl->n + 1, &rl->table_vlc[0][1], 4, 2, &rl->table_vlc[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
for (q = 0; q < 32; q++) {
|
|
int qmul = q * 2;
|
|
int qadd = (q - 1) | 1;
|
|
|
|
if (q == 0) {
|
|
qmul = 1;
|
|
qadd = 0;
|
|
}
|
|
for (i = 0; i < vlc.table_size; i++) {
|
|
int code = vlc.table[i][0];
|
|
int len = vlc.table[i][1];
|
|
int level, run;
|
|
|
|
if (len == 0) { // illegal code
|
|
run = 66;
|
|
level = MAX_LEVEL;
|
|
} else if (len < 0) { // more bits needed
|
|
run = 0;
|
|
level = code;
|
|
} else {
|
|
if (code == rl->n) { // esc
|
|
run = 66;
|
|
level = 0;
|
|
} else {
|
|
run = rl->table_run[code] + 1;
|
|
level = rl->table_level[code] * qmul + qadd;
|
|
if (code >= rl->last) run += 192;
|
|
}
|
|
}
|
|
rl->rl_vlc[q][i].len = len;
|
|
rl->rl_vlc[q][i].level = level;
|
|
rl->rl_vlc[q][i].run = run;
|
|
}
|
|
}
|
|
}
|