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FFmpeg/libavcodec/clearvideo.c
Michael Niedermayer f0efd795f4 avcodec/clearvideo: Only output a frame if one is coded in the packet 
Fixes: Timeout (183 ms instead of about 20 sec)
Fixes: 3147/clusterfuzz-testcase-4870592182353920

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2017-09-11 12:23:59 +02:00

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/*
* ClearVideo decoder
* Copyright (c) 2012 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 "idctdsp.h"
#include "internal.h"
#include "get_bits.h"
#include "bytestream.h"
#define NUM_DC_CODES 127
#define NUM_AC_CODES 103
static const uint8_t clv_dc_codes[NUM_DC_CODES] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x07, 0x0B,
0x0C, 0x08, 0x08, 0x09, 0x04, 0x06, 0x07, 0x05,
0x04, 0x05, 0x04, 0x06, 0x05, 0x06, 0x07, 0x05,
0x06, 0x07, 0x06, 0x07, 0x08, 0x06, 0x07, 0x08,
0x09, 0x0A, 0x0B, 0x07, 0x08, 0x09, 0x07, 0x08,
0x06, 0x07, 0x08, 0x06, 0x04, 0x05, 0x02, 0x01,
0x03, 0x06, 0x07, 0x07, 0x09, 0x0A, 0x0B, 0x09,
0x0A, 0x0B, 0x0A, 0x0B, 0x0C, 0x0D, 0x0C, 0x09,
0x0D, 0x0A, 0x0B, 0x08, 0x09, 0x0A, 0x0B, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x06, 0x07, 0x06, 0x08,
0x07, 0x09, 0x0A, 0x0B, 0x09, 0x0A, 0x0B, 0x0C,
0x14, 0x0D, 0x0D, 0x0E, 0x0F, 0x15, 0x15, 0x16,
0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E,
0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
};
static const uint8_t clv_dc_bits[NUM_DC_CODES] = {
22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 21, 22, 22, 19, 20,
20, 19, 18, 18, 15, 17, 17, 16,
14, 15, 12, 13, 14, 14, 14, 12,
12, 12, 11, 11, 11, 10, 10, 10,
10, 10, 10, 9, 9, 9, 8, 8,
7, 7, 7, 6, 5, 5, 3, 1,
3, 5, 5, 6, 7, 7, 7, 8,
8, 8, 9, 9, 9, 9, 10, 11,
10, 11, 11, 12, 12, 12, 12, 13,
14, 14, 14, 14, 15, 15, 16, 17,
16, 17, 18, 18, 19, 19, 19, 19,
21, 19, 20, 19, 19, 21, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22,
};
static const uint16_t clv_ac_syms[NUM_AC_CODES] = {
0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008,
0x0009, 0x000A, 0x000B, 0x000C, 0x0011, 0x0012, 0x0013, 0x0014,
0x0015, 0x0016, 0x0021, 0x0022, 0x0023, 0x0024, 0x0031, 0x0032,
0x0033, 0x0041, 0x0042, 0x0043, 0x0051, 0x0052, 0x0053, 0x0061,
0x0062, 0x0063, 0x0071, 0x0072, 0x0081, 0x0082, 0x0091, 0x0092,
0x00A1, 0x00A2, 0x00B1, 0x00C1, 0x00D1, 0x00E1, 0x00F1, 0x0101,
0x0111, 0x0121, 0x0131, 0x0141, 0x0151, 0x0161, 0x0171, 0x0181,
0x0191, 0x01A1, 0x1001, 0x1002, 0x1003, 0x1011, 0x1012, 0x1021,
0x1031, 0x1041, 0x1051, 0x1061, 0x1071, 0x1081, 0x1091, 0x10A1,
0x10B1, 0x10C1, 0x10D1, 0x10E1, 0x10F1, 0x1101, 0x1111, 0x1121,
0x1131, 0x1141, 0x1151, 0x1161, 0x1171, 0x1181, 0x1191, 0x11A1,
0x11B1, 0x11C1, 0x11D1, 0x11E1, 0x11F1, 0x1201, 0x1211, 0x1221,
0x1231, 0x1241, 0x1251, 0x1261, 0x1271, 0x1281, 0x1BFF,
};
static const uint8_t clv_ac_codes[NUM_AC_CODES] = {
0x02, 0x0F, 0x15, 0x17, 0x1F, 0x25, 0x24, 0x21,
0x20, 0x07, 0x06, 0x20, 0x06, 0x14, 0x1E, 0x0F,
0x21, 0x50, 0x0E, 0x1D, 0x0E, 0x51, 0x0D, 0x23,
0x0D, 0x0C, 0x22, 0x52, 0x0B, 0x0C, 0x53, 0x13,
0x0B, 0x54, 0x12, 0x0A, 0x11, 0x09, 0x10, 0x08,
0x16, 0x55, 0x15, 0x14, 0x1C, 0x1B, 0x21, 0x20,
0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x22, 0x23,
0x56, 0x57, 0x07, 0x19, 0x05, 0x0F, 0x04, 0x0E,
0x0D, 0x0C, 0x13, 0x12, 0x11, 0x10, 0x1A, 0x19,
0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x18, 0x17,
0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x07, 0x06,
0x05, 0x04, 0x24, 0x25, 0x26, 0x27, 0x58, 0x59,
0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x03,
};
static const uint8_t clv_ac_bits[NUM_AC_CODES] = {
2, 4, 6, 7, 8, 9, 9, 10,
10, 11, 11, 11, 3, 6, 8, 10,
11, 12, 4, 8, 10, 12, 5, 9,
10, 5, 9, 12, 5, 10, 12, 6,
10, 12, 6, 10, 6, 10, 6, 10,
7, 12, 7, 7, 8, 8, 9, 9,
9, 9, 9, 9, 9, 9, 11, 11,
12, 12, 4, 9, 11, 6, 11, 6,
6, 6, 7, 7, 7, 7, 8, 8,
8, 8, 8, 8, 8, 8, 9, 9,
9, 9, 9, 9, 9, 9, 10, 10,
10, 10, 11, 11, 11, 11, 12, 12,
12, 12, 12, 12, 12, 12, 7,
};
typedef struct CLVContext {
AVCodecContext *avctx;
IDCTDSPContext idsp;
AVFrame *pic;
GetBitContext gb;
int mb_width, mb_height;
VLC dc_vlc, ac_vlc;
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);
if (blk[0] < 0)
return AVERROR_INVALIDDATA;
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;
int has_ac[6];
int 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 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;
int 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 & 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)
return ret;
c->pic->key_frame = frame_type & 0x20 ? 1 : 0;
c->pic->pict_type = frame_type & 0x20 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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;
}
}
if ((ret = av_frame_ref(data, c->pic)) < 0)
return ret;
*got_frame = 1;
} else {
}
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;
c->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
c->pic = av_frame_alloc();
if (!c->pic)
return AVERROR(ENOMEM);
c->mb_width = FFALIGN(avctx->width, 16) >> 4;
c->mb_height = FFALIGN(avctx->height, 16) >> 4;
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_sparse(&c->ac_vlc, 9, NUM_AC_CODES,
clv_ac_bits, 1, 1,
clv_ac_codes, 1, 1,
clv_ac_syms, 2, 2, 0);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Error initialising AC VLC\n");
return ret;
}
return 0;
}
static av_cold int clv_decode_end(AVCodecContext *avctx)
{
CLVContext * const c = avctx->priv_data;
av_frame_free(&c->pic);
ff_free_vlc(&c->dc_vlc);
ff_free_vlc(&c->ac_vlc);
return 0;
}
AVCodec ff_clearvideo_decoder = {
.name = "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,
.long_name = NULL_IF_CONFIG_SMALL("Iterated Systems ClearVideo"),
};
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