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FFmpeg/libavcodec/sanm.c
Reimar Döffinger 49cf36f4e3 sanm: fix undefined behaviour on big-endian. 
A variable with post-increment may only appear
once in a statement.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2013-08-11 19:30:51 +02:00

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/*
* LucasArts Smush video decoder
* Copyright (c) 2006 Cyril Zorin
* Copyright (c) 2011 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
*/
// #define DEBUG 1
#include "avcodec.h"
#include "copy_block.h"
#include "bytestream.h"
#include "internal.h"
#include "libavutil/bswap.h"
#include "libavutil/imgutils.h"
#include "sanm_data.h"
#include "libavutil/avassert.h"
#define NGLYPHS 256
typedef struct {
AVCodecContext *avctx;
GetByteContext gb;
int version, subversion;
uint32_t pal[256];
int16_t delta_pal[768];
int pitch;
int width, height;
int aligned_width, aligned_height;
int prev_seq;
AVFrame *frame;
uint16_t *frm0, *frm1, *frm2;
uint8_t *stored_frame;
uint32_t frm0_size, frm1_size, frm2_size;
uint32_t stored_frame_size;
uint8_t *rle_buf;
unsigned int rle_buf_size;
int rotate_code;
long npixels, buf_size;
uint16_t codebook[256];
uint16_t small_codebook[4];
int8_t p4x4glyphs[NGLYPHS][16];
int8_t p8x8glyphs[NGLYPHS][64];
} SANMVideoContext;
typedef struct {
int seq_num, codec, rotate_code, rle_output_size;
uint16_t bg_color;
uint32_t width, height;
} SANMFrameHeader;
enum GlyphEdge {
LEFT_EDGE,
TOP_EDGE,
RIGHT_EDGE,
BOTTOM_EDGE,
NO_EDGE
};
enum GlyphDir {
DIR_LEFT,
DIR_UP,
DIR_RIGHT,
DIR_DOWN,
NO_DIR
};
/**
* Return enum GlyphEdge of box where point (x, y) lies.
*
* @param x x point coordinate
* @param y y point coordinate
* @param edge_size box width/height.
*/
static enum GlyphEdge which_edge(int x, int y, int edge_size)
{
const int edge_max = edge_size - 1;
if (!y) {
return BOTTOM_EDGE;
} else if (y == edge_max) {
return TOP_EDGE;
} else if (!x) {
return LEFT_EDGE;
} else if (x == edge_max) {
return RIGHT_EDGE;
} else {
return NO_EDGE;
}
}
static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)
{
if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||
(edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||
(edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||
(edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE)) {
return DIR_UP;
} else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||
(edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE)) {
return DIR_DOWN;
} else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||
(edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE)) {
return DIR_LEFT;
} else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||
(edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||
(edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||
(edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE)) {
return DIR_RIGHT;
}
return NO_DIR;
}
/**
* Interpolate two points.
*/
static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,
int pos, int npoints)
{
if (npoints) {
points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;
points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;
} else {
points[0] = x0;
points[1] = y0;
}
}
/**
* Construct glyphs by iterating through vectors coordinates.
*
* @param pglyphs pointer to table where glyphs are stored
* @param xvec pointer to x component of vectors coordinates
* @param yvec pointer to y component of vectors coordinates
* @param side_length glyph width/height.
*/
static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,
const int side_length)
{
const int glyph_size = side_length * side_length;
int8_t *pglyph = pglyphs;
int i, j;
for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {
int x0 = xvec[i];
int y0 = yvec[i];
enum GlyphEdge edge0 = which_edge(x0, y0, side_length);
for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {
int x1 = xvec[j];
int y1 = yvec[j];
enum GlyphEdge edge1 = which_edge(x1, y1, side_length);
enum GlyphDir dir = which_direction(edge0, edge1);
int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));
int ipoint;
for (ipoint = 0; ipoint <= npoints; ipoint++) {
int8_t point[2];
int irow, icol;
interp_point(point, x0, y0, x1, y1, ipoint, npoints);
switch (dir) {
case DIR_UP:
for (irow = point[1]; irow >= 0; irow--)
pglyph[point[0] + irow * side_length] = 1;
break;
case DIR_DOWN:
for (irow = point[1]; irow < side_length; irow++)
pglyph[point[0] + irow * side_length] = 1;
break;
case DIR_LEFT:
for (icol = point[0]; icol >= 0; icol--)
pglyph[icol + point[1] * side_length] = 1;
break;
case DIR_RIGHT:
for (icol = point[0]; icol < side_length; icol++)
pglyph[icol + point[1] * side_length] = 1;
break;
}
}
}
}
}
static void init_sizes(SANMVideoContext *ctx, int width, int height)
{
ctx->width = width;
ctx->height = height;
ctx->npixels = width * height;
ctx->aligned_width = FFALIGN(width, 8);
ctx->aligned_height = FFALIGN(height, 8);
ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);
ctx->pitch = width;
}
static void destroy_buffers(SANMVideoContext *ctx)
{
av_freep(&ctx->frm0);
av_freep(&ctx->frm1);
av_freep(&ctx->frm2);
av_freep(&ctx->stored_frame);
av_freep(&ctx->rle_buf);
ctx->frm0_size =
ctx->frm1_size =
ctx->frm2_size = 0;
}
static av_cold int init_buffers(SANMVideoContext *ctx)
{
av_fast_padded_malloc(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);
av_fast_padded_malloc(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);
av_fast_padded_malloc(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);
if (!ctx->version)
av_fast_padded_malloc(&ctx->stored_frame, &ctx->stored_frame_size, ctx->buf_size);
if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 || (!ctx->stored_frame && !ctx->version)) {
destroy_buffers(ctx);
return AVERROR(ENOMEM);
}
return 0;
}
static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)
{
av_dlog(ctx->avctx, "rotate %d\n", rotate_code);
if (rotate_code == 2)
FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);
FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);
}
static av_cold int decode_init(AVCodecContext *avctx)
{
SANMVideoContext *ctx = avctx->priv_data;
ctx->avctx = avctx;
ctx->version = !avctx->extradata_size;
avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;
init_sizes(ctx, avctx->width, avctx->height);
if (init_buffers(ctx)) {
av_log(avctx, AV_LOG_ERROR, "error allocating buffers\n");
return AVERROR(ENOMEM);
}
make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);
make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);
if (!ctx->version) {
int i;
if (avctx->extradata_size < 1026) {
av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
return AVERROR_INVALIDDATA;
}
ctx->subversion = AV_RL16(avctx->extradata);
for (i = 0; i < 256; i++)
ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);
}
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
SANMVideoContext *ctx = avctx->priv_data;
destroy_buffers(ctx);
return 0;
}
static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)
{
int opcode, color, run_len, left = out_size;
while (left > 0) {
opcode = bytestream2_get_byte(&ctx->gb);
run_len = (opcode >> 1) + 1;
if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)
return AVERROR_INVALIDDATA;
if (opcode & 1) {
color = bytestream2_get_byte(&ctx->gb);
memset(dst, color, run_len);
} else {
if (bytestream2_get_bytes_left(&ctx->gb) < run_len)
return AVERROR_INVALIDDATA;
bytestream2_get_bufferu(&ctx->gb, dst, run_len);
}
dst += run_len;
left -= run_len;
}
return 0;
}
static int old_codec1(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
uint8_t *dst = ((uint8_t*)ctx->frm0) + left + top * ctx->pitch;
int i, j, len, flag, code, val, pos, end;
for (i = 0; i < height; i++) {
pos = 0;
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
len = bytestream2_get_le16u(&ctx->gb);
end = bytestream2_tell(&ctx->gb) + len;
while (bytestream2_tell(&ctx->gb) < end) {
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
flag = code & 1;
code = (code >> 1) + 1;
if (pos + code > width)
return AVERROR_INVALIDDATA;
if (flag) {
val = bytestream2_get_byteu(&ctx->gb);
if (val)
memset(dst + pos, val, code);
pos += code;
} else {
if (bytestream2_get_bytes_left(&ctx->gb) < code)
return AVERROR_INVALIDDATA;
for (j = 0; j < code; j++) {
val = bytestream2_get_byteu(&ctx->gb);
if (val)
dst[pos] = val;
pos++;
}
}
}
dst += ctx->pitch;
}
ctx->rotate_code = 0;
return 0;
}
static inline void codec37_mv(uint8_t *dst, const uint8_t *src,
int height, int stride, int x, int y)
{
int pos, i, j;
pos = x + y * stride;
for (j = 0; j < 4; j++) {
for (i = 0; i < 4; i++) {
if ((pos + i) < 0 || (pos + i) >= height * stride)
dst[i] = 0;
else
dst[i] = src[i];
}
dst += stride;
src += stride;
pos += stride;
}
}
static int old_codec37(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
int stride = ctx->pitch;
int i, j, k, t;
int skip_run = 0;
int compr, mvoff, seq, flags;
uint32_t decoded_size;
uint8_t *dst, *prev;
compr = bytestream2_get_byte(&ctx->gb);
mvoff = bytestream2_get_byte(&ctx->gb);
seq = bytestream2_get_le16(&ctx->gb);
decoded_size = bytestream2_get_le32(&ctx->gb);
bytestream2_skip(&ctx->gb, 4);
flags = bytestream2_get_byte(&ctx->gb);
bytestream2_skip(&ctx->gb, 3);
if (decoded_size > ctx->height * stride - left - top * stride) {
decoded_size = ctx->height * stride - left - top * stride;
av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");
}
ctx->rotate_code = 0;
if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))
rotate_bufs(ctx, 1);
dst = ((uint8_t*)ctx->frm0) + left + top * stride;
prev = ((uint8_t*)ctx->frm2) + left + top * stride;
if (mvoff > 2) {
av_log(ctx->avctx, AV_LOG_ERROR, "invalid motion base value %d\n", mvoff);
return AVERROR_INVALIDDATA;
}
av_dlog(ctx->avctx, "compression %d\n", compr);
switch (compr) {
case 0:
for (i = 0; i < height; i++) {
bytestream2_get_buffer(&ctx->gb, dst, width);
dst += stride;
}
memset(ctx->frm1, 0, ctx->height * stride);
memset(ctx->frm2, 0, ctx->height * stride);
break;
case 2:
if (rle_decode(ctx, dst, decoded_size))
return AVERROR_INVALIDDATA;
memset(ctx->frm1, 0, ctx->frm1_size);
memset(ctx->frm2, 0, ctx->frm2_size);
break;
case 3:
case 4:
if (flags & 4) {
for (j = 0; j < height; j += 4) {
for (i = 0; i < width; i += 4) {
int code;
if (skip_run) {
skip_run--;
copy_block4(dst + i, prev + i, stride, stride, 4);
continue;
}
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
switch (code) {
case 0xFF:
if (bytestream2_get_bytes_left(&ctx->gb) < 16)
return AVERROR_INVALIDDATA;
for (k = 0; k < 4; k++)
bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
break;
case 0xFE:
if (bytestream2_get_bytes_left(&ctx->gb) < 4)
return AVERROR_INVALIDDATA;
for (k = 0; k < 4; k++)
memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);
break;
case 0xFD:
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
t = bytestream2_get_byteu(&ctx->gb);
for (k = 0; k < 4; k++)
memset(dst + i + k * stride, t, 4);
break;
default:
if (compr == 4 && !code) {
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
i -= 4;
} else {
int mx, my;
mx = c37_mv[(mvoff * 255 + code) * 2 ];
my = c37_mv[(mvoff * 255 + code) * 2 + 1];
codec37_mv(dst + i, prev + i + mx + my * stride,
ctx->height, stride, i + mx, j + my);
}
}
}
dst += stride * 4;
prev += stride * 4;
}
} else {
for (j = 0; j < height; j += 4) {
for (i = 0; i < width; i += 4) {
int code;
if (skip_run) {
skip_run--;
copy_block4(dst + i, prev + i, stride, stride, 4);
continue;
}
code = bytestream2_get_byte(&ctx->gb);
if (code == 0xFF) {
if (bytestream2_get_bytes_left(&ctx->gb) < 16)
return AVERROR_INVALIDDATA;
for (k = 0; k < 4; k++)
bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
} else if (compr == 4 && !code) {
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
i -= 4;
} else {
int mx, my;
mx = c37_mv[(mvoff * 255 + code) * 2];
my = c37_mv[(mvoff * 255 + code) * 2 + 1];
codec37_mv(dst + i, prev + i + mx + my * stride,
ctx->height, stride, i + mx, j + my);
}
}
dst += stride * 4;
prev += stride * 4;
}
}
break;
default:
av_log(ctx->avctx, AV_LOG_ERROR,
"subcodec 37 compression %d not implemented\n", compr);
return AVERROR_PATCHWELCOME;
}
return 0;
}
static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,
uint8_t *prev2, int stride, int tbl, int size)
{
int code, k, t;
uint8_t colors[2];
int8_t *pglyph;
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
if (code >= 0xF8) {
switch (code) {
case 0xFF:
if (size == 2) {
if (bytestream2_get_bytes_left(&ctx->gb) < 4)
return AVERROR_INVALIDDATA;
dst[0] = bytestream2_get_byteu(&ctx->gb);
dst[1] = bytestream2_get_byteu(&ctx->gb);
dst[0+stride] = bytestream2_get_byteu(&ctx->gb);
dst[1+stride] = bytestream2_get_byteu(&ctx->gb);
} else {
size >>= 1;
if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
return AVERROR_INVALIDDATA;
if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
stride, tbl, size))
return AVERROR_INVALIDDATA;
dst += size * stride;
prev1 += size * stride;
prev2 += size * stride;
if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
return AVERROR_INVALIDDATA;
if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
stride, tbl, size))
return AVERROR_INVALIDDATA;
}
break;
case 0xFE:
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
t = bytestream2_get_byteu(&ctx->gb);
for (k = 0; k < size; k++)
memset(dst + k * stride, t, size);
break;
case 0xFD:
if (bytestream2_get_bytes_left(&ctx->gb) < 3)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];
bytestream2_get_bufferu(&ctx->gb, colors, 2);
for (k = 0; k < size; k++)
for (t = 0; t < size; t++)
dst[t + k * stride] = colors[!*pglyph++];
break;
case 0xFC:
for (k = 0; k < size; k++)
memcpy(dst + k * stride, prev1 + k * stride, size);
break;
default:
k = bytestream2_tell(&ctx->gb);
bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);
t = bytestream2_get_byte(&ctx->gb);
bytestream2_seek(&ctx->gb, k, SEEK_SET);
for (k = 0; k < size; k++)
memset(dst + k * stride, t, size);
}
} else {
int mx = motion_vectors[code][0];
int my = motion_vectors[code][1];
int index = prev2 - (const uint8_t*)ctx->frm2;
av_assert2(index >= 0 && index < (ctx->buf_size>>1));
if (index < - mx - my*stride ||
(ctx->buf_size>>1) - index < mx + size + (my + size - 1)*stride) {
av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid \n");
return AVERROR_INVALIDDATA;
}
for (k = 0; k < size; k++)
memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);
}
return 0;
}
static int old_codec47(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
int i, j, seq, compr, new_rot, tbl_pos, skip;
int stride = ctx->pitch;
uint8_t *dst = ((uint8_t*)ctx->frm0) + left + top * stride;
uint8_t *prev1 = (uint8_t*)ctx->frm1;
uint8_t *prev2 = (uint8_t*)ctx->frm2;
uint32_t decoded_size;
tbl_pos = bytestream2_tell(&ctx->gb);
seq = bytestream2_get_le16(&ctx->gb);
compr = bytestream2_get_byte(&ctx->gb);
new_rot = bytestream2_get_byte(&ctx->gb);
skip = bytestream2_get_byte(&ctx->gb);
bytestream2_skip(&ctx->gb, 9);
decoded_size = bytestream2_get_le32(&ctx->gb);
bytestream2_skip(&ctx->gb, 8);
if (decoded_size > ctx->height * stride - left - top * stride) {
decoded_size = ctx->height * stride - left - top * stride;
av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");
}
if (skip & 1)
bytestream2_skip(&ctx->gb, 0x8080);
if (!seq) {
ctx->prev_seq = -1;
memset(prev1, 0, ctx->height * stride);
memset(prev2, 0, ctx->height * stride);
}
av_dlog(ctx->avctx, "compression %d\n", compr);
switch (compr) {
case 0:
if (bytestream2_get_bytes_left(&ctx->gb) < width * height)
return AVERROR_INVALIDDATA;
for (j = 0; j < height; j++) {
bytestream2_get_bufferu(&ctx->gb, dst, width);
dst += stride;
}
break;
case 1:
if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))
return AVERROR_INVALIDDATA;
for (j = 0; j < height; j += 2) {
for (i = 0; i < width; i += 2) {
dst[i] = dst[i + 1] =
dst[stride + i] = dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);
}
dst += stride * 2;
}
break;
case 2:
if (seq == ctx->prev_seq + 1) {
for (j = 0; j < height; j += 8) {
for (i = 0; i < width; i += 8) {
if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,
tbl_pos + 8, 8))
return AVERROR_INVALIDDATA;
}
dst += stride * 8;
prev1 += stride * 8;
prev2 += stride * 8;
}
}
break;
case 3:
memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);
break;
case 4:
memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);
break;
case 5:
if (rle_decode(ctx, dst, decoded_size))
return AVERROR_INVALIDDATA;
break;
default:
av_log(ctx->avctx, AV_LOG_ERROR,
"subcodec 47 compression %d not implemented\n", compr);
return AVERROR_PATCHWELCOME;
}
if (seq == ctx->prev_seq + 1)
ctx->rotate_code = new_rot;
else
ctx->rotate_code = 0;
ctx->prev_seq = seq;
return 0;
}
static int process_frame_obj(SANMVideoContext *ctx)
{
uint16_t codec, top, left, w, h;
codec = bytestream2_get_le16u(&ctx->gb);
left = bytestream2_get_le16u(&ctx->gb);
top = bytestream2_get_le16u(&ctx->gb);
w = bytestream2_get_le16u(&ctx->gb);
h = bytestream2_get_le16u(&ctx->gb);
if (!w || !h) {
av_log(ctx->avctx, AV_LOG_ERROR, "dimensions are invalid\n");
return AVERROR_INVALIDDATA;
}
if (ctx->width < left + w || ctx->height < top + h) {
if (av_image_check_size(FFMAX(left + w, ctx->width),
FFMAX(top + h, ctx->height), 0, ctx->avctx) < 0)
return AVERROR_INVALIDDATA;
avcodec_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),
FFMAX(top + h, ctx->height));
init_sizes(ctx, FFMAX(left + w, ctx->width),
FFMAX(top + h, ctx->height));
if (init_buffers(ctx)) {
av_log(ctx->avctx, AV_LOG_ERROR, "error resizing buffers\n");
return AVERROR(ENOMEM);
}
}
bytestream2_skip(&ctx->gb, 4);
av_dlog(ctx->avctx, "subcodec %d\n", codec);
switch (codec) {
case 1:
case 3:
return old_codec1(ctx, top, left, w, h);
break;
case 37:
return old_codec37(ctx, top, left, w, h);
break;
case 47:
return old_codec47(ctx, top, left, w, h);
break;
default:
avpriv_request_sample(ctx->avctx, "unknown subcodec %d", codec);
return AVERROR_PATCHWELCOME;
}
}
static int decode_0(SANMVideoContext *ctx)
{
uint16_t *frm = ctx->frm0;
int x, y;
if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {
av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for raw frame\n");
return AVERROR_INVALIDDATA;
}
for (y = 0; y < ctx->height; y++) {
for (x = 0; x < ctx->width; x++)
frm[x] = bytestream2_get_le16u(&ctx->gb);
frm += ctx->pitch;
}
return 0;
}
static int decode_nop(SANMVideoContext *ctx)
{
avpriv_request_sample(ctx->avctx, "unknown/unsupported compression type");
return AVERROR_PATCHWELCOME;
}
static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, int pitch)
{
uint8_t *dst = (uint8_t *)pdest;
uint8_t *src = (uint8_t *)psrc;
int stride = pitch * 2;
switch (block_size) {
case 2:
copy_block4(dst, src, stride, stride, 2);
break;
case 4:
copy_block8(dst, src, stride, stride, 4);
break;
case 8:
copy_block16(dst, src, stride, stride, 8);
break;
}
}
static void fill_block(uint16_t *pdest, uint16_t color, int block_size, int pitch)
{
int x, y;
pitch -= block_size;
for (y = 0; y < block_size; y++, pdest += pitch)
for (x = 0; x < block_size; x++)
*pdest++ = color;
}
static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index, uint16_t fg_color,
uint16_t bg_color, int block_size, int pitch)
{
int8_t *pglyph;
uint16_t colors[2] = { fg_color, bg_color };
int x, y;
if (index >= NGLYPHS) {
av_log(ctx->avctx, AV_LOG_ERROR, "ignoring nonexistent glyph #%u\n", index);
return AVERROR_INVALIDDATA;
}
pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];
pitch -= block_size;
for (y = 0; y < block_size; y++, dst += pitch)
for (x = 0; x < block_size; x++)
*dst++ = colors[*pglyph++];
return 0;
}
static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, int pitch)
{
uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
if (block_size == 2) {
uint32_t indices;
if (bytestream2_get_bytes_left(&ctx->gb) < 4)
return AVERROR_INVALIDDATA;
indices = bytestream2_get_le32u(&ctx->gb);
dst[0] = ctx->codebook[indices & 0xFF]; indices >>= 8;
dst[1] = ctx->codebook[indices & 0xFF]; indices >>= 8;
dst[pitch] = ctx->codebook[indices & 0xFF]; indices >>= 8;
dst[pitch + 1] = ctx->codebook[indices & 0xFF];
} else {
uint16_t fgcolor, bgcolor;
int glyph;
if (bytestream2_get_bytes_left(&ctx->gb) < 3)
return AVERROR_INVALIDDATA;
glyph = bytestream2_get_byteu(&ctx->gb);
bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
}
return 0;
}
static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, int pitch)
{
uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
if (block_size == 2) {
if (bytestream2_get_bytes_left(&ctx->gb) < 8)
return AVERROR_INVALIDDATA;
dst[0] = bytestream2_get_le16u(&ctx->gb);
dst[1] = bytestream2_get_le16u(&ctx->gb);
dst[pitch] = bytestream2_get_le16u(&ctx->gb);
dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);
} else {
uint16_t fgcolor, bgcolor;
int glyph;
if (bytestream2_get_bytes_left(&ctx->gb) < 5)
return AVERROR_INVALIDDATA;
glyph = bytestream2_get_byteu(&ctx->gb);
bgcolor = bytestream2_get_le16u(&ctx->gb);
fgcolor = bytestream2_get_le16u(&ctx->gb);
draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
}
return 0;
}
static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,
int block_size)
{
int start_pos = cx + mx + (cy + my) * ctx->pitch;
int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);
int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);
if (!good) {
av_log(ctx->avctx, AV_LOG_ERROR, "ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",
cx + mx, cy + my, cx, cy, block_size);
}
return good;
}
static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)
{
int16_t mx, my, index;
int opcode;
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
opcode = bytestream2_get_byteu(&ctx->gb);
av_dlog(ctx->avctx, "opcode 0x%0X cx %d cy %d blk %d\n", opcode, cx, cy, blk_size);
switch (opcode) {
default:
mx = motion_vectors[opcode][0];
my = motion_vectors[opcode][1];
if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
copy_block(ctx->frm0 + cx + ctx->pitch * cy,
ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
blk_size, ctx->pitch);
}
break;
case 0xF5:
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
index = bytestream2_get_le16u(&ctx->gb);
mx = index % ctx->width;
my = index / ctx->width;
if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
copy_block(ctx->frm0 + cx + ctx->pitch * cy,
ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
blk_size, ctx->pitch);
}
break;
case 0xF6:
copy_block(ctx->frm0 + cx + ctx->pitch * cy,
ctx->frm1 + cx + ctx->pitch * cy,
blk_size, ctx->pitch);
break;
case 0xF7:
opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);
break;
case 0xF8:
opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
break;
case 0xF9:
case 0xFA:
case 0xFB:
case 0xFC:
fill_block(ctx->frm0 + cx + cy * ctx->pitch,
ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);
break;
case 0xFD:
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
fill_block(ctx->frm0 + cx + cy * ctx->pitch,
ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);
break;
case 0xFE:
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
fill_block(ctx->frm0 + cx + cy * ctx->pitch,
bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);
break;
case 0xFF:
if (blk_size == 2) {
opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
} else {
blk_size >>= 1;
if (codec2subblock(ctx, cx , cy , blk_size))
return AVERROR_INVALIDDATA;
if (codec2subblock(ctx, cx + blk_size, cy , blk_size))
return AVERROR_INVALIDDATA;
if (codec2subblock(ctx, cx , cy + blk_size, blk_size))
return AVERROR_INVALIDDATA;
if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))
return AVERROR_INVALIDDATA;
}
break;
}
return 0;
}
static int decode_2(SANMVideoContext *ctx)
{
int cx, cy, ret;
for (cy = 0; cy < ctx->aligned_height; cy += 8) {
for (cx = 0; cx < ctx->aligned_width; cx += 8) {
if (ret = codec2subblock(ctx, cx, cy, 8))
return ret;
}
}
return 0;
}
static int decode_3(SANMVideoContext *ctx)
{
memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);
return 0;
}
static int decode_4(SANMVideoContext *ctx)
{
memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);
return 0;
}
static int decode_5(SANMVideoContext *ctx)
{
#if HAVE_BIGENDIAN
uint16_t *frm;
int npixels;
#endif
uint8_t *dst = (uint8_t*)ctx->frm0;
if (rle_decode(ctx, dst, ctx->buf_size))
return AVERROR_INVALIDDATA;
#if HAVE_BIGENDIAN
npixels = ctx->npixels;
frm = ctx->frm0;
while (npixels--) {
*frm = av_bswap16(*frm);
frm++;
}
#endif
return 0;
}
static int decode_6(SANMVideoContext *ctx)
{
int npixels = ctx->npixels;
uint16_t *frm = ctx->frm0;
if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {
av_log(ctx->avctx, AV_LOG_ERROR, "insufficient data for frame\n");
return AVERROR_INVALIDDATA;
}
while (npixels--)
*frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
return 0;
}
static int decode_8(SANMVideoContext *ctx)
{
uint16_t *pdest = ctx->frm0;
uint8_t *rsrc;
long npixels = ctx->npixels;
av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);
if (!ctx->rle_buf) {
av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed\n");
return AVERROR(ENOMEM);
}
rsrc = ctx->rle_buf;
if (rle_decode(ctx, rsrc, npixels))
return AVERROR_INVALIDDATA;
while (npixels--)
*pdest++ = ctx->codebook[*rsrc++];
return 0;
}
typedef int (*frm_decoder)(SANMVideoContext *ctx);
static const frm_decoder v1_decoders[] = {
decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,
decode_6, decode_nop, decode_8
};
static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
{
int i, ret;
if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {
av_log(ctx->avctx, AV_LOG_ERROR, "too short input frame (%d bytes)\n",
ret);
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&ctx->gb, 8); // skip pad
hdr->width = bytestream2_get_le32u(&ctx->gb);
hdr->height = bytestream2_get_le32u(&ctx->gb);
if (hdr->width != ctx->width || hdr->height != ctx->height) {
av_log(ctx->avctx, AV_LOG_ERROR, "variable size frames are not implemented\n");
return AVERROR_PATCHWELCOME;
}
hdr->seq_num = bytestream2_get_le16u(&ctx->gb);
hdr->codec = bytestream2_get_byteu(&ctx->gb);
hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);
bytestream2_skip(&ctx->gb, 4); // skip pad
for (i = 0; i < 4; i++)
ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);
hdr->bg_color = bytestream2_get_le16u(&ctx->gb);
bytestream2_skip(&ctx->gb, 2); // skip pad
hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);
for (i = 0; i < 256; i++)
ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);
bytestream2_skip(&ctx->gb, 8); // skip pad
av_dlog(ctx->avctx, "subcodec %d\n", hdr->codec);
return 0;
}
static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
{
while (buf_size--)
*pbuf++ = color;
}
static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)
{
uint8_t *dst;
const uint8_t *src = (uint8_t*) ctx->frm0;
int ret, dstpitch, height = ctx->height;
int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);
if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)
return ret;
dst = ctx->frame->data[0];
dstpitch = ctx->frame->linesize[0];
while (height--) {
memcpy(dst, src, srcpitch);
src += srcpitch;
dst += dstpitch;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *pkt)
{
SANMVideoContext *ctx = avctx->priv_data;
int i, ret;
ctx->frame = data;
bytestream2_init(&ctx->gb, pkt->data, pkt->size);
if (!ctx->version) {
int to_store = 0;
while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {
uint32_t sig, size;
int pos;
sig = bytestream2_get_be32u(&ctx->gb);
size = bytestream2_get_be32u(&ctx->gb);
pos = bytestream2_tell(&ctx->gb);
if (bytestream2_get_bytes_left(&ctx->gb) < size) {
av_log(avctx, AV_LOG_ERROR, "incorrect chunk size %d\n", size);
break;
}
switch (sig) {
case MKBETAG('N', 'P', 'A', 'L'):
if (size != 256 * 3) {
av_log(avctx, AV_LOG_ERROR, "incorrect palette block size %d\n",
size);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < 256; i++)
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
break;
case MKBETAG('F', 'O', 'B', 'J'):
if (size < 16)
return AVERROR_INVALIDDATA;
if (ret = process_frame_obj(ctx))
return ret;
break;
case MKBETAG('X', 'P', 'A', 'L'):
if (size == 6 || size == 4) {
uint8_t tmp[3];
int j;
for (i = 0; i < 256; i++) {
for (j = 0; j < 3; j++) {
int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;
tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);
}
ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);
}
} else {
if (size < 768 * 2 + 4) {
av_log(avctx, AV_LOG_ERROR, "incorrect palette change block size %d\n",
size);
return AVERROR_INVALIDDATA;
}
bytestream2_skipu(&ctx->gb, 4);
for (i = 0; i < 768; i++)
ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);
if (size >= 768 * 5 + 4) {
for (i = 0; i < 256; i++)
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
} else {
memset(ctx->pal, 0, sizeof(ctx->pal));
}
}
break;
case MKBETAG('S', 'T', 'O', 'R'):
to_store = 1;
break;
case MKBETAG('F', 'T', 'C', 'H'):
memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);
break;
default:
bytestream2_skip(&ctx->gb, size);
av_log(avctx, AV_LOG_DEBUG, "unknown/unsupported chunk %x\n", sig);
break;
}
bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);
if (size & 1)
bytestream2_skip(&ctx->gb, 1);
}
if (to_store)
memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);
if ((ret = copy_output(ctx, NULL)))
return ret;
memcpy(ctx->frame->data[1], ctx->pal, 1024);
} else {
SANMFrameHeader header;
if ((ret = read_frame_header(ctx, &header)))
return ret;
ctx->rotate_code = header.rotate_code;
if ((ctx->frame->key_frame = !header.seq_num)) {
ctx->frame->pict_type = AV_PICTURE_TYPE_I;
fill_frame(ctx->frm1, ctx->npixels, header.bg_color);
fill_frame(ctx->frm2, ctx->npixels, header.bg_color);
} else {
ctx->frame->pict_type = AV_PICTURE_TYPE_P;
}
if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {
if ((ret = v1_decoders[header.codec](ctx))) {
av_log(avctx, AV_LOG_ERROR,
"subcodec %d: error decoding frame\n", header.codec);
return ret;
}
} else {
avpriv_request_sample(avctx, "subcodec %d",
header.codec);
return AVERROR_PATCHWELCOME;
}
if ((ret = copy_output(ctx, &header)))
return ret;
}
if (ctx->rotate_code)
rotate_bufs(ctx, ctx->rotate_code);
*got_frame_ptr = 1;
return pkt->size;
}
AVCodec ff_sanm_decoder = {
.name = "sanm",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SANM,
.priv_data_size = sizeof(SANMVideoContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("LucasArts SMUSH video"),
};
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