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FFmpeg/libavcodec/agm.c
Michael Niedermayer 6ebbfb377f avcodec/agm: Fix overflow of signed shift 
Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 15328/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5637545171353600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-07-19 21:42:38 +02:00

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/*
* Amuse Graphics Movie decoder
*
* Copyright (c) 2018 Paul B Mahol
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "bytestream.h"
#include "copy_block.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
static const uint8_t unscaled_luma[64] = {
16, 11, 10, 16, 24, 40, 51, 61, 12, 12, 14, 19,
26, 58, 60, 55, 14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62, 18, 22, 37, 56,
68,109,103, 77, 24, 35, 55, 64, 81,104,113, 92,
49, 64, 78, 87,103,121,120,101, 72, 92, 95, 98,
112,100,103,99
};
static const uint8_t unscaled_chroma[64] = {
17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66,
99, 99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99
};
typedef struct MotionVector {
int16_t x, y;
} MotionVector;
typedef struct AGMContext {
const AVClass *class;
AVCodecContext *avctx;
GetBitContext gb;
GetByteContext gbyte;
int key_frame;
int bitstream_size;
int compression;
int blocks_w;
int blocks_h;
int size[3];
int plus;
int dct;
int rgb;
unsigned flags;
unsigned fflags;
uint8_t *output;
unsigned padded_output_size;
unsigned output_size;
MotionVector *mvectors;
unsigned mvectors_size;
VLC vlc;
AVFrame *prev_frame;
int luma_quant_matrix[64];
int chroma_quant_matrix[64];
ScanTable scantable;
DECLARE_ALIGNED(32, int16_t, block)[64];
int16_t *wblocks;
unsigned wblocks_size;
int *map;
unsigned map_size;
IDCTDSPContext idsp;
} AGMContext;
static int read_code(GetBitContext *gb, int *oskip, int *level, int *map, int mode)
{
int len = 0, skip = 0, max;
if (get_bits_left(gb) < 2)
return AVERROR_INVALIDDATA;
if (show_bits(gb, 2)) {
switch (show_bits(gb, 4)) {
case 1:
case 9:
len = 1;
skip = 3;
break;
case 2:
len = 3;
skip = 4;
break;
case 3:
len = 7;
skip = 4;
break;
case 5:
case 13:
len = 2;
skip = 3;
break;
case 6:
len = 4;
skip = 4;
break;
case 7:
len = 8;
skip = 4;
break;
case 10:
len = 5;
skip = 4;
break;
case 11:
len = 9;
skip = 4;
break;
case 14:
len = 6;
skip = 4;
break;
case 15:
len = ((show_bits(gb, 5) & 0x10) | 0xA0) >> 4;
skip = 5;
break;
default:
return AVERROR_INVALIDDATA;
}
skip_bits(gb, skip);
*level = get_bits(gb, len);
*map = 1;
*oskip = 0;
max = 1 << (len - 1);
if (*level < max)
*level = -(max + *level);
} else if (show_bits(gb, 3) & 4) {
skip_bits(gb, 3);
if (mode == 1) {
if (show_bits(gb, 4)) {
if (show_bits(gb, 4) == 1) {
skip_bits(gb, 4);
*oskip = get_bits(gb, 16);
} else {
*oskip = get_bits(gb, 4);
}
} else {
skip_bits(gb, 4);
*oskip = get_bits(gb, 10);
}
} else if (mode == 0) {
*oskip = get_bits(gb, 10);
}
*level = 0;
} else {
skip_bits(gb, 3);
if (mode == 0)
*oskip = get_bits(gb, 4);
else if (mode == 1)
*oskip = 0;
*level = 0;
}
return 0;
}
static int decode_intra_blocks(AGMContext *s, GetBitContext *gb,
const int *quant_matrix, int *skip, int *dc_level)
{
const uint8_t *scantable = s->scantable.permutated;
int level, ret, map = 0;
memset(s->wblocks, 0, s->wblocks_size);
for (int i = 0; i < 64; i++) {
int16_t *block = s->wblocks + scantable[i];
for (int j = 0; j < s->blocks_w;) {
if (*skip > 0) {
int rskip;
rskip = FFMIN(*skip, s->blocks_w - j);
j += rskip;
if (i == 0) {
for (int k = 0; k < rskip; k++)
block[64 * k] = *dc_level * quant_matrix[0];
}
block += rskip * 64;
*skip -= rskip;
} else {
ret = read_code(gb, skip, &level, &map, s->flags & 1);
if (ret < 0)
return ret;
if (i == 0)
*dc_level += level;
block[0] = (i == 0 ? *dc_level : level) * quant_matrix[i];
block += 64;
j++;
}
}
}
return 0;
}
static int decode_inter_blocks(AGMContext *s, GetBitContext *gb,
const int *quant_matrix, int *skip,
int *map)
{
const uint8_t *scantable = s->scantable.permutated;
int level, ret;
memset(s->wblocks, 0, s->wblocks_size);
memset(s->map, 0, s->map_size);
for (int i = 0; i < 64; i++) {
int16_t *block = s->wblocks + scantable[i];
for (int j = 0; j < s->blocks_w;) {
if (*skip > 0) {
int rskip;
rskip = FFMIN(*skip, s->blocks_w - j);
j += rskip;
block += rskip * 64;
*skip -= rskip;
} else {
ret = read_code(gb, skip, &level, &map[j], s->flags & 1);
if (ret < 0)
return ret;
block[0] = level * quant_matrix[i];
block += 64;
j++;
}
}
}
return 0;
}
static int decode_intra_block(AGMContext *s, GetBitContext *gb,
const int *quant_matrix, int *skip, int *dc_level)
{
const uint8_t *scantable = s->scantable.permutated;
const int offset = s->plus ? 0 : 1024;
int16_t *block = s->block;
int level, ret, map = 0;
memset(block, 0, sizeof(s->block));
if (*skip > 0) {
(*skip)--;
} else {
ret = read_code(gb, skip, &level, &map, s->flags & 1);
if (ret < 0)
return ret;
*dc_level += level;
}
block[scantable[0]] = offset + *dc_level * quant_matrix[0];
for (int i = 1; i < 64;) {
if (*skip > 0) {
int rskip;
rskip = FFMIN(*skip, 64 - i);
i += rskip;
*skip -= rskip;
} else {
ret = read_code(gb, skip, &level, &map, s->flags & 1);
if (ret < 0)
return ret;
block[scantable[i]] = level * quant_matrix[i];
i++;
}
}
return 0;
}
static int decode_intra_plane(AGMContext *s, GetBitContext *gb, int size,
const int *quant_matrix, AVFrame *frame,
int plane)
{
int ret, skip = 0, dc_level = 0;
const int offset = s->plus ? 0 : 1024;
if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0)
return ret;
if (s->flags & 1) {
av_fast_padded_malloc(&s->wblocks, &s->wblocks_size,
64 * s->blocks_w * sizeof(*s->wblocks));
if (!s->wblocks)
return AVERROR(ENOMEM);
for (int y = 0; y < s->blocks_h; y++) {
ret = decode_intra_blocks(s, gb, quant_matrix, &skip, &dc_level);
if (ret < 0)
return ret;
for (int x = 0; x < s->blocks_w; x++) {
s->wblocks[64 * x] += offset;
s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->wblocks + 64 * x);
}
}
} else {
for (int y = 0; y < s->blocks_h; y++) {
for (int x = 0; x < s->blocks_w; x++) {
ret = decode_intra_block(s, gb, quant_matrix, &skip, &dc_level);
if (ret < 0)
return ret;
s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->block);
}
}
}
align_get_bits(gb);
if (get_bits_left(gb) < 0)
av_log(s->avctx, AV_LOG_WARNING, "overread\n");
if (get_bits_left(gb) > 0)
av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb));
return 0;
}
static int decode_inter_block(AGMContext *s, GetBitContext *gb,
const int *quant_matrix, int *skip,
int *map)
{
const uint8_t *scantable = s->scantable.permutated;
int16_t *block = s->block;
int level, ret;
memset(block, 0, sizeof(s->block));
for (int i = 0; i < 64;) {
if (*skip > 0) {
int rskip;
rskip = FFMIN(*skip, 64 - i);
i += rskip;
*skip -= rskip;
} else {
ret = read_code(gb, skip, &level, map, s->flags & 1);
if (ret < 0)
return ret;
block[scantable[i]] = level * quant_matrix[i];
i++;
}
}
return 0;
}
static int decode_inter_plane(AGMContext *s, GetBitContext *gb, int size,
const int *quant_matrix, AVFrame *frame,
AVFrame *prev, int plane)
{
int ret, skip = 0;
if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0)
return ret;
if (s->flags == 3) {
av_fast_padded_malloc(&s->wblocks, &s->wblocks_size,
64 * s->blocks_w * sizeof(*s->wblocks));
if (!s->wblocks)
return AVERROR(ENOMEM);
av_fast_padded_malloc(&s->map, &s->map_size,
s->blocks_w * sizeof(*s->map));
if (!s->map)
return AVERROR(ENOMEM);
for (int y = 0; y < s->blocks_h; y++) {
ret = decode_inter_blocks(s, gb, quant_matrix, &skip, s->map);
if (ret < 0)
return ret;
for (int x = 0; x < s->blocks_w; x++) {
int shift = plane == 0;
int mvpos = (y >> shift) * (s->blocks_w >> shift) + (x >> shift);
int orig_mv_x = s->mvectors[mvpos].x;
int mv_x = s->mvectors[mvpos].x / (1 + !shift);
int mv_y = s->mvectors[mvpos].y / (1 + !shift);
int h = s->avctx->coded_height >> !shift;
int w = s->avctx->coded_width >> !shift;
int map = s->map[x];
if (orig_mv_x >= -32) {
if (y * 8 + mv_y < 0 || y * 8 + mv_y >= h ||
x * 8 + mv_x < 0 || x * 8 + mv_x >= w)
return AVERROR_INVALIDDATA;
copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
prev->data[plane] + ((s->blocks_h - 1 - y) * 8 - mv_y) * prev->linesize[plane] + (x * 8 + mv_x),
frame->linesize[plane], prev->linesize[plane], 8);
if (map) {
s->idsp.idct(s->wblocks + x * 64);
for (int i = 0; i < 64; i++)
s->wblocks[i + x * 64] = (s->wblocks[i + x * 64] + 1) & 0xFFFC;
s->idsp.add_pixels_clamped(&s->wblocks[x*64], frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane]);
}
} else if (map) {
s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->wblocks + x * 64);
}
}
}
} else if (s->flags & 2) {
for (int y = 0; y < s->blocks_h; y++) {
for (int x = 0; x < s->blocks_w; x++) {
int shift = plane == 0;
int mvpos = (y >> shift) * (s->blocks_w >> shift) + (x >> shift);
int orig_mv_x = s->mvectors[mvpos].x;
int mv_x = s->mvectors[mvpos].x / (1 + !shift);
int mv_y = s->mvectors[mvpos].y / (1 + !shift);
int h = s->avctx->coded_height >> !shift;
int w = s->avctx->coded_width >> !shift;
int map = 0;
ret = decode_inter_block(s, gb, quant_matrix, &skip, &map);
if (ret < 0)
return ret;
if (orig_mv_x >= -32) {
if (y * 8 + mv_y < 0 || y * 8 + mv_y >= h ||
x * 8 + mv_x < 0 || x * 8 + mv_x >= w)
return AVERROR_INVALIDDATA;
copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
prev->data[plane] + ((s->blocks_h - 1 - y) * 8 - mv_y) * prev->linesize[plane] + (x * 8 + mv_x),
frame->linesize[plane], prev->linesize[plane], 8);
if (map) {
s->idsp.idct(s->block);
for (int i = 0; i < 64; i++)
s->block[i] = (s->block[i] + 1) & 0xFFFC;
s->idsp.add_pixels_clamped(s->block, frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane]);
}
} else if (map) {
s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->block);
}
}
}
} else if (s->flags & 1) {
av_fast_padded_malloc(&s->wblocks, &s->wblocks_size,
64 * s->blocks_w * sizeof(*s->wblocks));
if (!s->wblocks)
return AVERROR(ENOMEM);
av_fast_padded_malloc(&s->map, &s->map_size,
s->blocks_w * sizeof(*s->map));
if (!s->map)
return AVERROR(ENOMEM);
for (int y = 0; y < s->blocks_h; y++) {
ret = decode_inter_blocks(s, gb, quant_matrix, &skip, s->map);
if (ret < 0)
return ret;
for (int x = 0; x < s->blocks_w; x++) {
if (!s->map[x])
continue;
s->idsp.idct_add(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->wblocks + 64 * x);
}
}
} else {
for (int y = 0; y < s->blocks_h; y++) {
for (int x = 0; x < s->blocks_w; x++) {
int map = 0;
ret = decode_inter_block(s, gb, quant_matrix, &skip, &map);
if (ret < 0)
return ret;
if (!map)
continue;
s->idsp.idct_add(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->block);
}
}
}
align_get_bits(gb);
if (get_bits_left(gb) < 0)
av_log(s->avctx, AV_LOG_WARNING, "overread\n");
if (get_bits_left(gb) > 0)
av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb));
return 0;
}
static void compute_quant_matrix(AGMContext *s, double qscale)
{
int luma[64], chroma[64];
double f = 1.0 - fabs(qscale);
if (!s->key_frame && (s->flags & 2)) {
if (qscale >= 0.0) {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, 16 * f);
chroma[i] = FFMAX(1, 16 * f);
}
} else {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, 16 - qscale * 32);
chroma[i] = FFMAX(1, 16 - qscale * 32);
}
}
} else {
if (qscale >= 0.0) {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, unscaled_luma [(i & 7) * 8 + (i >> 3)] * f);
chroma[i] = FFMAX(1, unscaled_chroma[(i & 7) * 8 + (i >> 3)] * f);
}
} else {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, 255.0 - (255 - unscaled_luma [(i & 7) * 8 + (i >> 3)]) * f);
chroma[i] = FFMAX(1, 255.0 - (255 - unscaled_chroma[(i & 7) * 8 + (i >> 3)]) * f);
}
}
}
for (int i = 0; i < 64; i++) {
int pos = ff_zigzag_direct[i];
s->luma_quant_matrix[i] = luma[pos] * ((pos / 8) & 1 ? -1 : 1);
s->chroma_quant_matrix[i] = chroma[pos] * ((pos / 8) & 1 ? -1 : 1);
}
}
static int decode_raw_intra_rgb(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
{
uint8_t *dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
uint8_t r = 0, g = 0, b = 0;
for (int y = 0; y < avctx->height; y++) {
for (int x = 0; x < avctx->width; x++) {
dst[x*3+0] = bytestream2_get_byte(gbyte) + r;
r = dst[x*3+0];
dst[x*3+1] = bytestream2_get_byte(gbyte) + g;
g = dst[x*3+1];
dst[x*3+2] = bytestream2_get_byte(gbyte) + b;
b = dst[x*3+2];
}
dst -= frame->linesize[0];
}
return 0;
}
static int fill_pixels(uint8_t **y0, uint8_t **y1,
uint8_t **u, uint8_t **v,
int ylinesize, int ulinesize, int vlinesize,
uint8_t *fill,
int *nx, int *ny, int *np, int w, int h)
{
uint8_t *y0dst = *y0;
uint8_t *y1dst = *y1;
uint8_t *udst = *u;
uint8_t *vdst = *v;
int x = *nx, y = *ny, pos = *np;
if (pos == 0) {
y0dst[2*x+0] += fill[0];
y0dst[2*x+1] += fill[1];
y1dst[2*x+0] += fill[2];
y1dst[2*x+1] += fill[3];
pos++;
} else if (pos == 1) {
udst[x] += fill[0];
vdst[x] += fill[1];
x++;
if (x >= w) {
x = 0;
y++;
if (y >= h)
return 1;
y0dst -= 2*ylinesize;
y1dst -= 2*ylinesize;
udst -= ulinesize;
vdst -= vlinesize;
}
y0dst[2*x+0] += fill[2];
y0dst[2*x+1] += fill[3];
pos++;
} else if (pos == 2) {
y1dst[2*x+0] += fill[0];
y1dst[2*x+1] += fill[1];
udst[x] += fill[2];
vdst[x] += fill[3];
x++;
if (x >= w) {
x = 0;
y++;
if (y >= h)
return 1;
y0dst -= 2*ylinesize;
y1dst -= 2*ylinesize;
udst -= ulinesize;
vdst -= vlinesize;
}
pos = 0;
}
*y0 = y0dst;
*y1 = y1dst;
*u = udst;
*v = vdst;
*np = pos;
*nx = x;
*ny = y;
return 0;
}
static int decode_runlen_rgb(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
{
uint8_t *dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
int runlen, y = 0, x = 0;
uint8_t fill[4];
unsigned code;
while (bytestream2_get_bytes_left(gbyte) > 0) {
code = bytestream2_peek_le32(gbyte);
runlen = code & 0xFFFFFF;
if (code >> 24 == 0x77) {
bytestream2_skip(gbyte, 4);
for (int i = 0; i < 4; i++)
fill[i] = bytestream2_get_byte(gbyte);
while (runlen > 0) {
runlen--;
for (int i = 0; i < 4; i++) {
dst[x] += fill[i];
x++;
if (x >= frame->width * 3) {
x = 0;
y++;
dst -= frame->linesize[0];
if (y >= frame->height)
return 0;
}
}
}
} else {
for (int i = 0; i < 4; i++)
fill[i] = bytestream2_get_byte(gbyte);
for (int i = 0; i < 4; i++) {
dst[x] += fill[i];
x++;
if (x >= frame->width * 3) {
x = 0;
y++;
dst -= frame->linesize[0];
if (y >= frame->height)
return 0;
}
}
}
}
return 0;
}
static int decode_runlen(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
{
uint8_t *y0dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
uint8_t *y1dst = y0dst - frame->linesize[0];
uint8_t *udst = frame->data[1] + ((avctx->height >> 1) - 1) * frame->linesize[1];
uint8_t *vdst = frame->data[2] + ((avctx->height >> 1) - 1) * frame->linesize[2];
int runlen, y = 0, x = 0, pos = 0;
uint8_t fill[4];
unsigned code;
while (bytestream2_get_bytes_left(gbyte) > 0) {
code = bytestream2_peek_le32(gbyte);
runlen = code & 0xFFFFFF;
if (code >> 24 == 0x77) {
bytestream2_skip(gbyte, 4);
for (int i = 0; i < 4; i++)
fill[i] = bytestream2_get_byte(gbyte);
while (runlen > 0) {
runlen--;
if (fill_pixels(&y0dst, &y1dst, &udst, &vdst,
frame->linesize[0],
frame->linesize[1],
frame->linesize[2],
fill, &x, &y, &pos,
avctx->width / 2,
avctx->height / 2))
return 0;
}
} else {
for (int i = 0; i < 4; i++)
fill[i] = bytestream2_get_byte(gbyte);
if (fill_pixels(&y0dst, &y1dst, &udst, &vdst,
frame->linesize[0],
frame->linesize[1],
frame->linesize[2],
fill, &x, &y, &pos,
avctx->width / 2,
avctx->height / 2))
return 0;
}
}
return 0;
}
static int decode_raw_intra(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
{
uint8_t *y0dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
uint8_t *y1dst = y0dst - frame->linesize[0];
uint8_t *udst = frame->data[1] + ((avctx->height >> 1) - 1) * frame->linesize[1];
uint8_t *vdst = frame->data[2] + ((avctx->height >> 1) - 1) * frame->linesize[2];
uint8_t ly0 = 0, ly1 = 0, ly2 = 0, ly3 = 0, lu = 0, lv = 0;
for (int y = 0; y < avctx->height / 2; y++) {
for (int x = 0; x < avctx->width / 2; x++) {
y0dst[x*2+0] = bytestream2_get_byte(gbyte) + ly0;
ly0 = y0dst[x*2+0];
y0dst[x*2+1] = bytestream2_get_byte(gbyte) + ly1;
ly1 = y0dst[x*2+1];
y1dst[x*2+0] = bytestream2_get_byte(gbyte) + ly2;
ly2 = y1dst[x*2+0];
y1dst[x*2+1] = bytestream2_get_byte(gbyte) + ly3;
ly3 = y1dst[x*2+1];
udst[x] = bytestream2_get_byte(gbyte) + lu;
lu = udst[x];
vdst[x] = bytestream2_get_byte(gbyte) + lv;
lv = vdst[x];
}
y0dst -= 2*frame->linesize[0];
y1dst -= 2*frame->linesize[0];
udst -= frame->linesize[1];
vdst -= frame->linesize[2];
}
return 0;
}
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
{
AGMContext *s = avctx->priv_data;
int ret;
compute_quant_matrix(s, (2 * s->compression - 100) / 100.0);
s->blocks_w = avctx->coded_width >> 3;
s->blocks_h = avctx->coded_height >> 3;
ret = decode_intra_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, 0);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[0]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_intra_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, 2);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[1]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_intra_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, 1);
if (ret < 0)
return ret;
return 0;
}
static int decode_motion_vectors(AVCodecContext *avctx, GetBitContext *gb)
{
AGMContext *s = avctx->priv_data;
int nb_mvs = ((avctx->height + 15) >> 4) * ((avctx->width + 15) >> 4);
int ret, skip = 0, value, map;
av_fast_padded_malloc(&s->mvectors, &s->mvectors_size,
nb_mvs * sizeof(*s->mvectors));
if (!s->mvectors)
return AVERROR(ENOMEM);
if ((ret = init_get_bits8(gb, s->gbyte.buffer, bytestream2_get_bytes_left(&s->gbyte) -
(s->size[0] + s->size[1] + s->size[2]))) < 0)
return ret;
memset(s->mvectors, 0, sizeof(*s->mvectors) * nb_mvs);
for (int i = 0; i < nb_mvs; i++) {
ret = read_code(gb, &skip, &value, &map, 1);
if (ret < 0)
return ret;
s->mvectors[i].x = value;
i += skip;
}
for (int i = 0; i < nb_mvs; i++) {
ret = read_code(gb, &skip, &value, &map, 1);
if (ret < 0)
return ret;
s->mvectors[i].y = value;
i += skip;
}
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
skip = (get_bits_count(gb) >> 3) + 1;
bytestream2_skip(&s->gbyte, skip);
return 0;
}
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
AVFrame *frame, AVFrame *prev)
{
AGMContext *s = avctx->priv_data;
int ret;
compute_quant_matrix(s, (2 * s->compression - 100) / 100.0);
if (s->flags & 2) {
ret = decode_motion_vectors(avctx, gb);
if (ret < 0)
return ret;
}
s->blocks_w = avctx->coded_width >> 3;
s->blocks_h = avctx->coded_height >> 3;
ret = decode_inter_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, prev, 0);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[0]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_inter_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, prev, 2);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[1]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_inter_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, prev, 1);
if (ret < 0)
return ret;
return 0;
}
typedef struct Node {
int parent;
int child[2];
} Node;
static void get_tree_codes(uint32_t *codes, Node *nodes, int idx, uint32_t pfx, int bitpos)
{
if (idx < 256 && idx >= 0) {
codes[idx] = pfx;
} else if (idx >= 0) {
get_tree_codes(codes, nodes, nodes[idx].child[0], pfx + (0 << bitpos), bitpos + 1);
get_tree_codes(codes, nodes, nodes[idx].child[1], pfx + (1U << bitpos), bitpos + 1);
}
}
static int make_new_tree(const uint8_t *bitlens, uint32_t *codes)
{
int zlcount = 0, curlen, idx, nindex, last, llast;
int blcounts[32] = { 0 };
int syms[8192];
Node nodes[512];
int node_idx[1024];
int old_idx[512];
for (int i = 0; i < 256; i++) {
int bitlen = bitlens[i];
int blcount = blcounts[bitlen];
zlcount += bitlen < 1;
syms[(bitlen << 8) + blcount] = i;
blcounts[bitlen]++;
}
for (int i = 0; i < 512; i++) {
nodes[i].child[0] = -1;
nodes[i].child[1] = -1;
}
for (int i = 0; i < 256; i++) {
node_idx[i] = 257 + i;
}
curlen = 1;
node_idx[512] = 256;
last = 255;
nindex = 1;
for (curlen = 1; curlen < 32; curlen++) {
if (blcounts[curlen] > 0) {
int max_zlcount = zlcount + blcounts[curlen];
for (int i = 0; zlcount < 256 && zlcount < max_zlcount; zlcount++, i++) {
int p = node_idx[nindex - 1 + 512];
int ch = syms[256 * curlen + i];
if (nindex <= 0)
return AVERROR_INVALIDDATA;
if (nodes[p].child[0] == -1) {
nodes[p].child[0] = ch;
} else {
nodes[p].child[1] = ch;
nindex--;
}
nodes[ch].parent = p;
}
}
llast = last - 1;
idx = 0;
while (nindex > 0) {
int p, ch;
last = llast - idx;
p = node_idx[nindex - 1 + 512];
ch = node_idx[last];
if (nodes[p].child[0] == -1) {
nodes[p].child[0] = ch;
} else {
nodes[p].child[1] = ch;
nindex--;
}
old_idx[idx] = ch;
nodes[ch].parent = p;
if (idx == llast)
goto next;
idx++;
if (nindex <= 0) {
for (int i = 0; i < idx; i++)
node_idx[512 + i] = old_idx[i];
}
}
nindex = idx;
}
next:
get_tree_codes(codes, nodes, 256, 0, 0);
return 0;
}
static int build_huff(const uint8_t *bitlen, VLC *vlc)
{
uint32_t new_codes[256];
uint8_t bits[256];
uint8_t symbols[256];
uint32_t codes[256];
int nb_codes = 0;
int ret = make_new_tree(bitlen, new_codes);
if (ret < 0)
return ret;
for (int i = 0; i < 256; i++) {
if (bitlen[i]) {
bits[nb_codes] = bitlen[i];
codes[nb_codes] = new_codes[i];
symbols[nb_codes] = i;
nb_codes++;
}
}
ff_free_vlc(vlc);
return ff_init_vlc_sparse(vlc, 13, nb_codes,
bits, 1, 1,
codes, 4, 4,
symbols, 1, 1,
INIT_VLC_LE);
}
static int decode_huffman2(AVCodecContext *avctx, int header, int size)
{
AGMContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
uint8_t lens[256];
int ret, x, len;
if ((ret = init_get_bits8(gb, s->gbyte.buffer,
bytestream2_get_bytes_left(&s->gbyte))) < 0)
return ret;
s->output_size = get_bits_long(gb, 32);
if (s->output_size > avctx->width * avctx->height * 9LL + 10000)
return AVERROR_INVALIDDATA;
av_fast_padded_malloc(&s->output, &s->padded_output_size, s->output_size);
if (!s->output)
return AVERROR(ENOMEM);
x = get_bits(gb, 1);
len = 4 + get_bits(gb, 1);
if (x) {
int cb[8] = { 0 };
int count = get_bits(gb, 3) + 1;
for (int i = 0; i < count; i++)
cb[i] = get_bits(gb, len);
for (int i = 0; i < 256; i++) {
int idx = get_bits(gb, 3);
lens[i] = cb[idx];
}
} else {
for (int i = 0; i < 256; i++)
lens[i] = get_bits(gb, len);
}
if ((ret = build_huff(lens, &s->vlc)) < 0)
return ret;
x = 0;
while (get_bits_left(gb) > 0 && x < s->output_size) {
int val = get_vlc2(gb, s->vlc.table, s->vlc.bits, 3);
if (val < 0)
return AVERROR_INVALIDDATA;
s->output[x++] = val;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
AGMContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
GetByteContext *gbyte = &s->gbyte;
AVFrame *frame = data;
int w, h, width, height, header;
unsigned compressed_size;
long skip;
int ret;
if (!avpkt->size)
return 0;
bytestream2_init(gbyte, avpkt->data, avpkt->size);
header = bytestream2_get_le32(gbyte);
s->fflags = bytestream2_get_le32(gbyte);
s->bitstream_size = s->fflags & 0x1FFFFFFF;
s->fflags >>= 29;
av_log(avctx, AV_LOG_DEBUG, "fflags: %X\n", s->fflags);
if (avpkt->size < s->bitstream_size + 8)
return AVERROR_INVALIDDATA;
s->key_frame = (avpkt->flags & AV_PKT_FLAG_KEY);
frame->key_frame = s->key_frame;
frame->pict_type = s->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
if (header) {
if (avctx->codec_tag == MKTAG('A', 'G', 'M', '0') ||
avctx->codec_tag == MKTAG('A', 'G', 'M', '1'))
return AVERROR_PATCHWELCOME;
else
ret = decode_huffman2(avctx, header, (avpkt->size - s->bitstream_size) - 8);
if (ret < 0)
return ret;
bytestream2_init(gbyte, s->output, s->output_size);
} else if (!s->dct) {
bytestream2_skip(gbyte, 4);
}
if (s->dct) {
s->flags = 0;
w = bytestream2_get_le32(gbyte);
h = bytestream2_get_le32(gbyte);
if (w == INT32_MIN || h == INT32_MIN)
return AVERROR_INVALIDDATA;
if (w < 0) {
w = -w;
s->flags |= 2;
}
if (h < 0) {
h = -h;
s->flags |= 1;
}
width = avctx->width;
height = avctx->height;
if (w < width || h < height || w & 7 || h & 7)
return AVERROR_INVALIDDATA;
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
avctx->width = width;
avctx->height = height;
s->compression = bytestream2_get_le32(gbyte);
if (s->compression < 0 || s->compression > 100)
return AVERROR_INVALIDDATA;
for (int i = 0; i < 3; i++)
s->size[i] = bytestream2_get_le32(gbyte);
if (header) {
compressed_size = s->output_size;
skip = 8LL;
} else {
compressed_size = avpkt->size;
skip = 32LL;
}
if (s->size[0] < 0 || s->size[1] < 0 || s->size[2] < 0 ||
skip + s->size[0] + s->size[1] + s->size[2] > compressed_size) {
return AVERROR_INVALIDDATA;
}
}
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if (frame->key_frame) {
if (!s->dct && !s->rgb)
ret = decode_raw_intra(avctx, gbyte, frame);
else if (!s->dct && s->rgb)
ret = decode_raw_intra_rgb(avctx, gbyte, frame);
else
ret = decode_intra(avctx, gb, frame);
} else {
if (!s->prev_frame->data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
return AVERROR_INVALIDDATA;
}
if (s->prev_frame-> width != frame->width ||
s->prev_frame->height != frame->height)
return AVERROR_INVALIDDATA;
if (!(s->flags & 2)) {
ret = av_frame_copy(frame, s->prev_frame);
if (ret < 0)
return ret;
}
if (s->dct) {
ret = decode_inter(avctx, gb, frame, s->prev_frame);
} else if (!s->dct && !s->rgb) {
ret = decode_runlen(avctx, gbyte, frame);
} else {
ret = decode_runlen_rgb(avctx, gbyte, frame);
}
}
if (ret < 0)
return ret;
av_frame_unref(s->prev_frame);
if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
return ret;
frame->crop_top = avctx->coded_height - avctx->height;
frame->crop_left = avctx->coded_width - avctx->width;
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
AGMContext *s = avctx->priv_data;
s->rgb = avctx->codec_tag == MKTAG('A', 'G', 'M', '4');
avctx->pix_fmt = s->rgb ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUV420P;
s->avctx = avctx;
s->plus = avctx->codec_tag == MKTAG('A', 'G', 'M', '3') ||
avctx->codec_tag == MKTAG('A', 'G', 'M', '7');
s->dct = avctx->codec_tag != MKTAG('A', 'G', 'M', '4') &&
avctx->codec_tag != MKTAG('A', 'G', 'M', '5');
avctx->idct_algo = FF_IDCT_SIMPLE;
ff_idctdsp_init(&s->idsp, avctx);
ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)
return AVERROR(ENOMEM);
return 0;
}
static void decode_flush(AVCodecContext *avctx)
{
AGMContext *s = avctx->priv_data;
av_frame_unref(s->prev_frame);
}
static av_cold int decode_close(AVCodecContext *avctx)
{
AGMContext *s = avctx->priv_data;
ff_free_vlc(&s->vlc);
av_frame_free(&s->prev_frame);
av_freep(&s->mvectors);
s->mvectors_size = 0;
av_freep(&s->wblocks);
s->wblocks_size = 0;
av_freep(&s->output);
s->padded_output_size = 0;
av_freep(&s->map);
s->map_size = 0;
return 0;
}
AVCodec ff_agm_decoder = {
.name = "agm",
.long_name = NULL_IF_CONFIG_SMALL("Amuse Graphics Movie"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AGM,
.priv_data_size = sizeof(AGMContext),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.flush = decode_flush,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_EXPORTS_CROPPING,
};
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