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FFmpeg/libavcodec/clearvideo.c
Michael Niedermayer 11fac9613e avcodec/clearvideo: Check tile_size to be not too large 
Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 35023/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CLEARVIDEO_fuzzer-6740166587842560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2021-06-29 19:36:36 +02:00

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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 "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "mathops.h"
#include "clearvideodata.h"
#define CLV_VLC_BITS 9
typedef struct LevelCodes {
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;
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 VLC dc_vlc, ac_vlc;
static LevelCodes lev[4 + 3 + 3]; // 0..3: Y, 4..6: U, 7..9: V
static VLC_TYPE vlc_buf[16716][2];
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, dc_vlc.table, CLV_VLC_BITS, 3);
if (!has_ac)
return 0;
while (idx < 64 && !last) {
val = get_vlc2(gb, ac_vlc.table, CLV_VLC_BITS, 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, const 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, CLV_VLC_BITS, 2);
}
if (lc[level].mv_cb.table) {
uint16_t mv_code = get_vlc2(gb, lc[level].mv_cb.table, CLV_VLC_BITS, 2);
if (mv_code != 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, CLV_VLC_BITS, 2);
if (bias_val != 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, &lev[0], 0); // Y
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, &lev[4], 0); // U
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, &lev[7], 0); // V
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 void build_vlc(VLC *vlc, const uint8_t counts[16],
const uint16_t **syms, unsigned *offset)
{
uint8_t lens[MAX_VLC_ENTRIES];
unsigned num = 0;
for (int i = 0; i < 16; i++) {
unsigned count = counts[i];
if (count == 255) /* Special case for Y_3 table */
count = 303;
for (count += num; num < count; num++)
lens[num] = i + 1;
}
vlc->table = &vlc_buf[*offset];
vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *offset;
ff_init_vlc_from_lengths(vlc, CLV_VLC_BITS, num, lens, 1,
*syms, 2, 2, 0, INIT_VLC_STATIC_OVERLONG, NULL);
*syms += num;
*offset += vlc->table_size;
}
static av_cold void clv_init_static(void)
{
const uint16_t *mv_syms = clv_mv_syms, *bias_syms = clv_bias_syms;
INIT_VLC_STATIC_FROM_LENGTHS(&dc_vlc, CLV_VLC_BITS, NUM_DC_CODES,
clv_dc_lens, 1,
clv_dc_syms, 1, 1, -63, 0, 1104);
INIT_VLC_STATIC_FROM_LENGTHS(&ac_vlc, CLV_VLC_BITS, NUM_AC_CODES,
clv_ac_bits, 1,
clv_ac_syms, 2, 2, 0, 0, 554);
for (unsigned i = 0, j = 0, k = 0, offset = 0;; i++) {
if (0x36F & (1 << i)) {
build_vlc(&lev[i].mv_cb, clv_mv_len_counts[k], &mv_syms, &offset);
k++;
}
if (i == FF_ARRAY_ELEMS(lev) - 1)
break;
if (0x1B7 & (1 << i)) {
lev[i].flags_cb.table = &vlc_buf[offset];
lev[i].flags_cb.table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
ff_init_vlc_from_lengths(&lev[i].flags_cb, CLV_VLC_BITS, 16,
clv_flags_bits[j], 1,
clv_flags_syms[j], 1, 1,
0, INIT_VLC_STATIC_OVERLONG, NULL);
offset += lev[i].flags_cb.table_size;
build_vlc(&lev[i + 1].bias_cb, clv_bias_len_counts[j],
&bias_syms, &offset);
j++;
}
}
}
static av_cold int clv_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
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 || c->tile_shift < 1 || c->tile_shift > 30) {
av_log(avctx, AV_LOG_ERROR, "Tile size: %d, is not power of 2 > 1 and < 2^31\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);
ff_thread_once(&init_static_once, clv_init_static);
return 0;
}
static av_cold int clv_decode_end(AVCodecContext *avctx)
{
CLVContext *const c = avctx->priv_data;
av_frame_free(&c->prev);
av_frame_free(&c->pic);
av_freep(&c->mvi.mv);
return 0;
}
const 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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