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FFmpeg/libavcodec/clearvideo.c
Andreas Rheinhardt c82a559e6f avcodec/clearvideo: Avoid code tables for initializing VLCs 
The ClearVideo decoder uses VLC tables that are initialized at runtime
from static length, symbol and codes tables. Yet the code tables can be
omitted by subjecting all of these tables to the permutation that orders
the codes from left to right in the tree. After this is done, the codes
can be easily computed at runtime from the lengths and therefore
omitted. This saves about 10KB.

Only one minor complication is encountered when doing so: The tree
corresponding to the AC VLC codes is incomplete; but this can be
handled by adding an entry with negative length.

Furthermore, there are also VLCs that are only initialized with lengths
and codes tables with codes of type uint16_t. These have also been
switched to ff_init_vlc_from_lengths() as this means that one can
replace the uint16_t codes tables with uint8_t symbols tables.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-12-08 17:51:45 +01:00

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/*
* ClearVideo decoder
* Copyright (c) 2012-2018 Konstantin Shishkov
*
* 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
* ClearVideo decoder
*/
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "mathops.h"
#include "clearvideodata.h"
typedef struct LevelCodes {
uint16_t mv_esc;
uint16_t bias_esc;
VLC flags_cb;
VLC mv_cb;
VLC bias_cb;
} LevelCodes;
typedef struct MV {
int16_t x, y;
} MV;
static const MV zero_mv = { 0 };
typedef struct MVInfo {
int mb_w;
int mb_h;
int mb_size;
int mb_stride;
int top;
MV *mv;
} MVInfo;
typedef struct TileInfo {
uint16_t flags;
int16_t bias;
MV mv;
struct TileInfo *child[4];
} TileInfo;
typedef struct CLVContext {
AVCodecContext *avctx;
IDCTDSPContext idsp;
AVFrame *pic;
AVFrame *prev;
GetBitContext gb;
int mb_width, mb_height;
int pmb_width, pmb_height;
MVInfo mvi;
int tile_size;
int tile_shift;
VLC dc_vlc, ac_vlc;
LevelCodes ylev[4], ulev[3], vlev[3];
int luma_dc_quant, chroma_dc_quant, ac_quant;
DECLARE_ALIGNED(16, int16_t, block)[64];
int top_dc[3], left_dc[4];
} CLVContext;
static inline int decode_block(CLVContext *ctx, int16_t *blk, int has_ac,
int ac_quant)
{
GetBitContext *gb = &ctx->gb;
int idx = 1, last = 0, val, skip;
memset(blk, 0, sizeof(*blk) * 64);
blk[0] = get_vlc2(gb, ctx->dc_vlc.table, 9, 3);
blk[0] -= 63;
if (!has_ac)
return 0;
while (idx < 64 && !last) {
val = get_vlc2(gb, ctx->ac_vlc.table, 9, 2);
if (val < 0)
return AVERROR_INVALIDDATA;
if (val != 0x1BFF) {
last = val >> 12;
skip = (val >> 4) & 0xFF;
val &= 0xF;
if (get_bits1(gb))
val = -val;
} else {
last = get_bits1(gb);
skip = get_bits(gb, 6);
val = get_sbits(gb, 8);
}
if (val) {
int aval = FFABS(val), sign = val < 0;
val = ac_quant * (2 * aval + 1);
if (!(ac_quant & 1))
val--;
if (sign)
val = -val;
}
idx += skip;
if (idx >= 64)
return AVERROR_INVALIDDATA;
blk[ff_zigzag_direct[idx++]] = val;
}
return (idx <= 64 && last) ? 0 : -1;
}
#define DCT_TEMPLATE(blk, step, bias, shift, dshift, OP) \
const int t0 = OP(2841 * blk[1 * step] + 565 * blk[7 * step]); \
const int t1 = OP( 565 * blk[1 * step] - 2841 * blk[7 * step]); \
const int t2 = OP(1609 * blk[5 * step] + 2408 * blk[3 * step]); \
const int t3 = OP(2408 * blk[5 * step] - 1609 * blk[3 * step]); \
const int t4 = OP(1108 * blk[2 * step] - 2676 * blk[6 * step]); \
const int t5 = OP(2676 * blk[2 * step] + 1108 * blk[6 * step]); \
const int t6 = ((blk[0 * step] + blk[4 * step]) * (1 << dshift)) + bias; \
const int t7 = ((blk[0 * step] - blk[4 * step]) * (1 << dshift)) + bias; \
const int t8 = t0 + t2; \
const int t9 = t0 - t2; \
const int tA = (int)(181U * (t9 + (t1 - t3)) + 0x80) >> 8; \
const int tB = (int)(181U * (t9 - (t1 - t3)) + 0x80) >> 8; \
const int tC = t1 + t3; \
\
blk[0 * step] = (t6 + t5 + t8) >> shift; \
blk[1 * step] = (t7 + t4 + tA) >> shift; \
blk[2 * step] = (t7 - t4 + tB) >> shift; \
blk[3 * step] = (t6 - t5 + tC) >> shift; \
blk[4 * step] = (t6 - t5 - tC) >> shift; \
blk[5 * step] = (t7 - t4 - tB) >> shift; \
blk[6 * step] = (t7 + t4 - tA) >> shift; \
blk[7 * step] = (t6 + t5 - t8) >> shift; \
#define ROP(x) x
#define COP(x) (((x) + 4) >> 3)
static void clv_dct(int16_t *block)
{
int i;
int16_t *ptr;
ptr = block;
for (i = 0; i < 8; i++) {
DCT_TEMPLATE(ptr, 1, 0x80, 8, 11, ROP);
ptr += 8;
}
ptr = block;
for (i = 0; i < 8; i++) {
DCT_TEMPLATE(ptr, 8, 0x2000, 14, 8, COP);
ptr++;
}
}
static int decode_mb(CLVContext *c, int x, int y)
{
int i, has_ac[6], off;
for (i = 0; i < 6; i++)
has_ac[i] = get_bits1(&c->gb);
off = x * 16 + y * 16 * c->pic->linesize[0];
for (i = 0; i < 4; i++) {
if (decode_block(c, c->block, has_ac[i], c->ac_quant) < 0)
return AVERROR_INVALIDDATA;
if (!x && !(i & 1)) {
c->block[0] += c->top_dc[0];
c->top_dc[0] = c->block[0];
} else {
c->block[0] += c->left_dc[(i & 2) >> 1];
}
c->left_dc[(i & 2) >> 1] = c->block[0];
c->block[0] *= c->luma_dc_quant;
clv_dct(c->block);
if (i == 2)
off += c->pic->linesize[0] * 8;
c->idsp.put_pixels_clamped(c->block,
c->pic->data[0] + off + (i & 1) * 8,
c->pic->linesize[0]);
}
off = x * 8 + y * 8 * c->pic->linesize[1];
for (i = 1; i < 3; i++) {
if (decode_block(c, c->block, has_ac[i + 3], c->ac_quant) < 0)
return AVERROR_INVALIDDATA;
if (!x) {
c->block[0] += c->top_dc[i];
c->top_dc[i] = c->block[0];
} else {
c->block[0] += c->left_dc[i + 1];
}
c->left_dc[i + 1] = c->block[0];
c->block[0] *= c->chroma_dc_quant;
clv_dct(c->block);
c->idsp.put_pixels_clamped(c->block, c->pic->data[i] + off,
c->pic->linesize[i]);
}
return 0;
}
static int copy_block(AVCodecContext *avctx, AVFrame *dst, AVFrame *src,
int plane, int x, int y, int dx, int dy, int size)
{
int shift = plane > 0;
int sx = x + dx;
int sy = y + dy;
int sstride, dstride, soff, doff;
uint8_t *sbuf, *dbuf;
int i;
if (x < 0 || sx < 0 || y < 0 || sy < 0 ||
x + size > avctx->coded_width >> shift ||
y + size > avctx->coded_height >> shift ||
sx + size > avctx->coded_width >> shift ||
sy + size > avctx->coded_height >> shift)
return AVERROR_INVALIDDATA;
sstride = src->linesize[plane];
dstride = dst->linesize[plane];
soff = sx + sy * sstride;
sbuf = src->data[plane];
doff = x + y * dstride;
dbuf = dst->data[plane];
for (i = 0; i < size; i++) {
uint8_t *dptr = &dbuf[doff];
uint8_t *sptr = &sbuf[soff];
memcpy(dptr, sptr, size);
doff += dstride;
soff += sstride;
}
return 0;
}
static int copyadd_block(AVCodecContext *avctx, AVFrame *dst, AVFrame *src,
int plane, int x, int y, int dx, int dy, int size, int bias)
{
int shift = plane > 0;
int sx = x + dx;
int sy = y + dy;
int sstride = src->linesize[plane];
int dstride = dst->linesize[plane];
int soff = sx + sy * sstride;
uint8_t *sbuf = src->data[plane];
int doff = x + y * dstride;
uint8_t *dbuf = dst->data[plane];
int i, j;
if (x < 0 || sx < 0 || y < 0 || sy < 0 ||
x + size > avctx->coded_width >> shift ||
y + size > avctx->coded_height >> shift ||
sx + size > avctx->coded_width >> shift ||
sy + size > avctx->coded_height >> shift)
return AVERROR_INVALIDDATA;
for (j = 0; j < size; j++) {
uint8_t *dptr = &dbuf[doff];
uint8_t *sptr = &sbuf[soff];
for (i = 0; i < size; i++) {
int val = sptr[i] + bias;
dptr[i] = av_clip_uint8(val);
}
doff += dstride;
soff += sstride;
}
return 0;
}
static MV mvi_predict(MVInfo *mvi, int mb_x, int mb_y, MV diff)
{
MV res, pred_mv;
int left_mv, right_mv, top_mv, bot_mv;
if (mvi->top) {
if (mb_x > 0) {
pred_mv = mvi->mv[mvi->mb_stride + mb_x - 1];
} else {
pred_mv = zero_mv;
}
} else if ((mb_x == 0) || (mb_x == mvi->mb_w - 1)) {
pred_mv = mvi->mv[mb_x];
} else {
MV A = mvi->mv[mvi->mb_stride + mb_x - 1];
MV B = mvi->mv[ mb_x ];
MV C = mvi->mv[ mb_x + 1];
pred_mv.x = mid_pred(A.x, B.x, C.x);
pred_mv.y = mid_pred(A.y, B.y, C.y);
}
res = pred_mv;
left_mv = -((mb_x * mvi->mb_size));
right_mv = ((mvi->mb_w - mb_x - 1) * mvi->mb_size);
if (res.x < left_mv) {
res.x = left_mv;
}
if (res.x > right_mv) {
res.x = right_mv;
}
top_mv = -((mb_y * mvi->mb_size));
bot_mv = ((mvi->mb_h - mb_y - 1) * mvi->mb_size);
if (res.y < top_mv) {
res.y = top_mv;
}
if (res.y > bot_mv) {
res.y = bot_mv;
}
mvi->mv[mvi->mb_stride + mb_x].x = res.x + diff.x;
mvi->mv[mvi->mb_stride + mb_x].y = res.y + diff.y;
return res;
}
static void mvi_reset(MVInfo *mvi, int mb_w, int mb_h, int mb_size)
{
mvi->top = 1;
mvi->mb_w = mb_w;
mvi->mb_h = mb_h;
mvi->mb_size = mb_size;
mvi->mb_stride = mb_w;
memset(mvi->mv, 0, sizeof(MV) * mvi->mb_stride * 2);
}
static void mvi_update_row(MVInfo *mvi)
{
int i;
mvi->top = 0;
for (i = 0 ; i < mvi->mb_stride; i++) {
mvi->mv[i] = mvi->mv[mvi->mb_stride + i];
}
}
static TileInfo* decode_tile_info(GetBitContext *gb, LevelCodes *lc, int level)
{
TileInfo *ti;
int i, flags = 0;
int16_t bias = 0;
MV mv = { 0 };
if (lc[level].flags_cb.table) {
flags = get_vlc2(gb, lc[level].flags_cb.table, lc[level].flags_cb.bits, 2);
}
if (lc[level].mv_cb.table) {
uint16_t mv_code = get_vlc2(gb, lc[level].mv_cb.table, lc[level].mv_cb.bits, 3);
if (mv_code != lc[level].mv_esc) {
mv.x = (int8_t)(mv_code & 0xff);
mv.y = (int8_t)(mv_code >> 8);
} else {
mv.x = get_sbits(gb, 8);
mv.y = get_sbits(gb, 8);
}
}
if (lc[level].bias_cb.table) {
uint16_t bias_val = get_vlc2(gb, lc[level].bias_cb.table, lc[level].bias_cb.bits, 2);
if (bias_val != lc[level].bias_esc) {
bias = (int16_t)(bias_val);
} else {
bias = get_sbits(gb, 16);
}
}
ti = av_calloc(1, sizeof(*ti));
if (!ti)
return NULL;
ti->flags = flags;
ti->mv = mv;
ti->bias = bias;
if (ti->flags) {
for (i = 0; i < 4; i++) {
if (ti->flags & (1 << i)) {
TileInfo *subti = decode_tile_info(gb, lc, level + 1);
ti->child[i] = subti;
}
}
}
return ti;
}
static int tile_do_block(AVCodecContext *avctx, AVFrame *dst, AVFrame *src,
int plane, int x, int y, int dx, int dy, int size, int bias)
{
int ret;
if (!bias) {
ret = copy_block(avctx, dst, src, plane, x, y, dx, dy, size);
} else {
ret = copyadd_block(avctx, dst, src, plane, x, y, dx, dy, size, bias);
}
return ret;
}
static int restore_tree(AVCodecContext *avctx, AVFrame *dst, AVFrame *src,
int plane, int x, int y, int size,
TileInfo *tile, MV root_mv)
{
int ret;
MV mv;
mv.x = root_mv.x + tile->mv.x;
mv.y = root_mv.y + tile->mv.y;
if (!tile->flags) {
ret = tile_do_block(avctx, dst, src, plane, x, y, mv.x, mv.y, size, tile->bias);
} else {
int i, hsize = size >> 1;
for (i = 0; i < 4; i++) {
int xoff = (i & 2) == 0 ? 0 : hsize;
int yoff = (i & 1) == 0 ? 0 : hsize;
if (tile->child[i]) {
ret = restore_tree(avctx, dst, src, plane, x + xoff, y + yoff, hsize, tile->child[i], root_mv);
av_freep(&tile->child[i]);
} else {
ret = tile_do_block(avctx, dst, src, plane, x + xoff, y + yoff, mv.x, mv.y, hsize, tile->bias);
}
}
}
return ret;
}
static void extend_edges(AVFrame *buf, int tile_size)
{
int comp, i, j;
for (comp = 0; comp < 3; comp++) {
int shift = comp > 0;
int w = buf->width >> shift;
int h = buf->height >> shift;
int size = comp == 0 ? tile_size : tile_size >> 1;
int stride = buf->linesize[comp];
uint8_t *framebuf = buf->data[comp];
int right = size - (w & (size - 1));
int bottom = size - (h & (size - 1));
if ((right == size) && (bottom == size)) {
return;
}
if (right != size) {
int off = w;
for (j = 0; j < h; j++) {
for (i = 0; i < right; i++) {
framebuf[off + i] = 0x80;
}
off += stride;
}
}
if (bottom != size) {
int off = h * stride;
for (j = 0; j < bottom; j++) {
for (i = 0; i < stride; i++) {
framebuf[off + i] = 0x80;
}
off += stride;
}
}
}
}
static int clv_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
CLVContext *c = avctx->priv_data;
GetByteContext gb;
uint32_t frame_type;
int i, j, ret;
int mb_ret = 0;
bytestream2_init(&gb, buf, buf_size);
if (avctx->codec_tag == MKTAG('C', 'L', 'V', '1')) {
int skip = bytestream2_get_byte(&gb);
bytestream2_skip(&gb, (skip + 1) * 8);
}
frame_type = bytestream2_get_byte(&gb);
if ((frame_type & 0x7f) == 0x30) {
*got_frame = 0;
return buf_size;
} else if (frame_type & 0x2) {
if (buf_size < c->mb_width * c->mb_height) {
av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
return ret;
c->pic->key_frame = 1;
c->pic->pict_type = AV_PICTURE_TYPE_I;
bytestream2_get_be32(&gb); // frame size;
c->ac_quant = bytestream2_get_byte(&gb);
c->luma_dc_quant = 32;
c->chroma_dc_quant = 32;
if ((ret = init_get_bits8(&c->gb, buf + bytestream2_tell(&gb),
buf_size - bytestream2_tell(&gb))) < 0)
return ret;
for (i = 0; i < 3; i++)
c->top_dc[i] = 32;
for (i = 0; i < 4; i++)
c->left_dc[i] = 32;
for (j = 0; j < c->mb_height; j++) {
for (i = 0; i < c->mb_width; i++) {
ret = decode_mb(c, i, j);
if (ret < 0)
mb_ret = ret;
}
}
extend_edges(c->pic, c->tile_size);
} else {
int plane;
if (c->pmb_width * c->pmb_height > 8LL*(buf_size - bytestream2_tell(&gb)))
return AVERROR_INVALIDDATA;
if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
return ret;
ret = av_frame_copy(c->pic, c->prev);
if (ret < 0)
return ret;
if ((ret = init_get_bits8(&c->gb, buf + bytestream2_tell(&gb),
buf_size - bytestream2_tell(&gb))) < 0)
return ret;
mvi_reset(&c->mvi, c->pmb_width, c->pmb_height, 1 << c->tile_shift);
for (j = 0; j < c->pmb_height; j++) {
for (i = 0; i < c->pmb_width; i++) {
if (get_bits_left(&c->gb) <= 0)
return AVERROR_INVALIDDATA;
if (get_bits1(&c->gb)) {
MV mv = mvi_predict(&c->mvi, i, j, zero_mv);
for (plane = 0; plane < 3; plane++) {
int16_t x = plane == 0 ? i << c->tile_shift : i << (c->tile_shift - 1);
int16_t y = plane == 0 ? j << c->tile_shift : j << (c->tile_shift - 1);
int16_t size = plane == 0 ? 1 << c->tile_shift : 1 << (c->tile_shift - 1);
int16_t mx = plane == 0 ? mv.x : mv.x / 2;
int16_t my = plane == 0 ? mv.y : mv.y / 2;
ret = copy_block(avctx, c->pic, c->prev, plane, x, y, mx, my, size);
if (ret < 0)
mb_ret = ret;
}
} else {
int x = i << c->tile_shift;
int y = j << c->tile_shift;
int size = 1 << c->tile_shift;
TileInfo *tile;
MV mv, cmv;
tile = decode_tile_info(&c->gb, c->ylev, 0);
if (!tile)
return AVERROR(ENOMEM);
mv = mvi_predict(&c->mvi, i, j, tile->mv);
ret = restore_tree(avctx, c->pic, c->prev, 0, x, y, size, tile, mv);
if (ret < 0)
mb_ret = ret;
x = i << (c->tile_shift - 1);
y = j << (c->tile_shift - 1);
size = 1 << (c->tile_shift - 1);
cmv.x = mv.x + tile->mv.x;
cmv.y = mv.y + tile->mv.y;
cmv.x /= 2;
cmv.y /= 2;
av_freep(&tile);
tile = decode_tile_info(&c->gb, c->ulev, 0);
if (!tile)
return AVERROR(ENOMEM);
ret = restore_tree(avctx, c->pic, c->prev, 1, x, y, size, tile, cmv);
if (ret < 0)
mb_ret = ret;
av_freep(&tile);
tile = decode_tile_info(&c->gb, c->vlev, 0);
if (!tile)
return AVERROR(ENOMEM);
ret = restore_tree(avctx, c->pic, c->prev, 2, x, y, size, tile, cmv);
if (ret < 0)
mb_ret = ret;
av_freep(&tile);
}
}
mvi_update_row(&c->mvi);
}
extend_edges(c->pic, c->tile_size);
c->pic->key_frame = 0;
c->pic->pict_type = AV_PICTURE_TYPE_P;
}
if ((ret = av_frame_ref(data, c->pic)) < 0)
return ret;
FFSWAP(AVFrame *, c->pic, c->prev);
*got_frame = 1;
if (get_bits_left(&c->gb) < 0)
av_log(c->avctx, AV_LOG_WARNING, "overread %d\n", -get_bits_left(&c->gb));
return mb_ret < 0 ? mb_ret : buf_size;
}
static av_cold int clv_decode_init(AVCodecContext *avctx)
{
CLVContext *const c = avctx->priv_data;
int ret, w, h;
if (avctx->extradata_size == 110) {
c->tile_size = AV_RL32(&avctx->extradata[94]);
} else if (avctx->extradata_size == 150) {
c->tile_size = AV_RB32(&avctx->extradata[134]);
} else if (!avctx->extradata_size) {
c->tile_size = 16;
} else {
av_log(avctx, AV_LOG_ERROR, "Unsupported extradata size: %d\n", avctx->extradata_size);
return AVERROR_INVALIDDATA;
}
c->tile_shift = av_log2(c->tile_size);
if (1U << c->tile_shift != c->tile_size) {
av_log(avctx, AV_LOG_ERROR, "Tile size: %d, is not power of 2.\n", c->tile_size);
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
w = avctx->width;
h = avctx->height;
ret = ff_set_dimensions(avctx, FFALIGN(w, 1 << c->tile_shift), FFALIGN(h, 1 << c->tile_shift));
if (ret < 0)
return ret;
avctx->width = w;
avctx->height = h;
c->avctx = avctx;
c->mb_width = FFALIGN(avctx->width, 16) >> 4;
c->mb_height = FFALIGN(avctx->height, 16) >> 4;
c->pmb_width = (w + c->tile_size - 1) >> c->tile_shift;
c->pmb_height = (h + c->tile_size - 1) >> c->tile_shift;
c->pic = av_frame_alloc();
c->prev = av_frame_alloc();
c->mvi.mv = av_calloc(c->pmb_width * 2, sizeof(*c->mvi.mv));
if (!c->pic || !c->prev || !c->mvi.mv)
return AVERROR(ENOMEM);
ff_idctdsp_init(&c->idsp, avctx);
ret = init_vlc(&c->dc_vlc, 9, NUM_DC_CODES,
clv_dc_bits, 1, 1,
clv_dc_codes, 1, 1, 0);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Error initialising DC VLC\n");
return ret;
}
ret = ff_init_vlc_from_lengths(&c->ac_vlc, 9, NUM_AC_CODES,
clv_ac_bits, 1,
clv_ac_syms, 2, 2, 0, 0, avctx);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Error initialising AC VLC\n");
return ret;
}
ret = ff_init_vlc_from_lengths(&c->ylev[0].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsy_0_bits),
clv_flagsy_0_bits, 1,
clv_flagsy_0_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[1].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsy_1_bits),
clv_flagsy_1_bits, 1,
clv_flagsy_1_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[2].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsy_2_bits),
clv_flagsy_2_bits, 1,
clv_flagsy_2_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ulev[0].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsu_0_bits),
clv_flagsu_0_bits, 1,
clv_flagsu_0_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ulev[1].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsu_1_bits),
clv_flagsu_1_bits, 1,
clv_flagsu_1_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->vlev[0].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsv_0_bits),
clv_flagsv_0_bits, 1,
clv_flagsv_0_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->vlev[1].flags_cb, 9, FF_ARRAY_ELEMS(clv_flagsv_1_bits),
clv_flagsv_1_bits, 1,
clv_flagsv_1_syms, 1, 1, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[0].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvy_0_bits),
clv_mvy_0_bits, 1,
clv_mvy_0_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[1].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvy_1_bits),
clv_mvy_1_bits, 1,
clv_mvy_1_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[2].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvy_2_bits),
clv_mvy_2_bits, 1,
clv_mvy_2_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[3].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvy_3_bits),
clv_mvy_3_bits, 1,
clv_mvy_3_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ulev[1].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvu_1_bits),
clv_mvu_1_bits, 1,
clv_mvu_1_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ulev[2].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvu_2_bits),
clv_mvu_2_bits, 1,
clv_mvu_2_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->vlev[1].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvv_1_bits),
clv_mvv_1_bits, 1,
clv_mvv_1_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->vlev[2].mv_cb, 9, FF_ARRAY_ELEMS(clv_mvv_2_bits),
clv_mvv_2_bits, 1,
clv_mvv_2_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[1].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasy_1_bits),
clv_biasy_1_bits, 1,
clv_biasy_1_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[2].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasy_2_bits),
clv_biasy_2_bits, 1,
clv_biasy_2_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ylev[3].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasy_3_bits),
clv_biasy_3_bits, 1,
clv_biasy_3_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ulev[1].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasu_1_bits),
clv_biasu_1_bits, 1,
clv_biasu_1_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->ulev[2].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasu_2_bits),
clv_biasu_2_bits, 1,
clv_biasu_2_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->vlev[1].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasv_1_bits),
clv_biasv_1_bits, 1,
clv_biasv_1_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(&c->vlev[2].bias_cb, 9, FF_ARRAY_ELEMS(clv_biasv_2_bits),
clv_biasv_2_bits, 1,
clv_biasv_2_syms, 2, 2, 0, 0, avctx);
if (ret)
return ret;
c->ylev[0].mv_esc = 0x0909;
c->ylev[1].mv_esc = 0x0A0A;
c->ylev[2].mv_esc = 0x1010;
c->ylev[3].mv_esc = 0x1313;
c->ulev[1].mv_esc = 0x0808;
c->ulev[2].mv_esc = 0x0B0B;
c->vlev[1].mv_esc = 0x0808;
c->vlev[2].mv_esc = 0x0B0B;
c->ylev[1].bias_esc = 0x100;
c->ylev[2].bias_esc = 0x100;
c->ylev[3].bias_esc = 0x100;
c->ulev[1].bias_esc = 0x100;
c->ulev[2].bias_esc = 0x100;
c->vlev[1].bias_esc = 0x100;
c->vlev[2].bias_esc = 0x100;
return 0;
}
static av_cold int clv_decode_end(AVCodecContext *avctx)
{
CLVContext *const c = avctx->priv_data;
int i;
av_frame_free(&c->prev);
av_frame_free(&c->pic);
av_freep(&c->mvi.mv);
ff_free_vlc(&c->dc_vlc);
ff_free_vlc(&c->ac_vlc);
for (i = 0; i < 4; i++) {
ff_free_vlc(&c->ylev[i].mv_cb);
ff_free_vlc(&c->ylev[i].flags_cb);
ff_free_vlc(&c->ylev[i].bias_cb);
}
for (i = 0; i < 3; i++) {
ff_free_vlc(&c->ulev[i].mv_cb);
ff_free_vlc(&c->ulev[i].flags_cb);
ff_free_vlc(&c->ulev[i].bias_cb);
ff_free_vlc(&c->vlev[i].mv_cb);
ff_free_vlc(&c->vlev[i].flags_cb);
ff_free_vlc(&c->vlev[i].bias_cb);
}
return 0;
}
AVCodec ff_clearvideo_decoder = {
.name = "clearvideo",
.long_name = NULL_IF_CONFIG_SMALL("Iterated Systems ClearVideo"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_CLEARVIDEO,
.priv_data_size = sizeof(CLVContext),
.init = clv_decode_init,
.close = clv_decode_end,
.decode = clv_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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