427 lines
13 KiB
C
Executable file
427 lines
13 KiB
C
Executable file
/*
|
|
* Chronomaster DFA Video Decoder
|
|
* Copyright (c) 2011 Konstantin Shishkov
|
|
* based on work by Vladimir "VAG" Gneushev
|
|
*
|
|
* 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 <inttypes.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "internal.h"
|
|
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
typedef struct DfaContext {
|
|
uint32_t pal[256];
|
|
uint8_t *frame_buf;
|
|
} DfaContext;
|
|
|
|
static av_cold int dfa_decode_init(AVCodecContext *avctx)
|
|
{
|
|
DfaContext *s = avctx->priv_data;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
|
|
if (!avctx->width || !avctx->height || FFMAX(avctx->width, avctx->height) >= (1<<16))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
av_assert0(av_image_check_size(avctx->width, avctx->height, 0, avctx) >= 0);
|
|
|
|
s->frame_buf = av_mallocz(avctx->width * avctx->height);
|
|
if (!s->frame_buf)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_copy(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
const int size = width * height;
|
|
|
|
if (bytestream2_get_buffer(gb, frame, size) != size)
|
|
return AVERROR_INVALIDDATA;
|
|
return 0;
|
|
}
|
|
|
|
static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
const uint8_t *frame_start = frame;
|
|
const uint8_t *frame_end = frame + width * height;
|
|
int mask = 0x10000, bitbuf = 0;
|
|
int v, count;
|
|
unsigned segments;
|
|
unsigned offset;
|
|
|
|
segments = bytestream2_get_le32(gb);
|
|
offset = bytestream2_get_le32(gb);
|
|
if (segments == 0 && offset == frame_end - frame)
|
|
return 0; // skip frame
|
|
if (frame_end - frame <= offset)
|
|
return AVERROR_INVALIDDATA;
|
|
frame += offset;
|
|
while (segments--) {
|
|
if (bytestream2_get_bytes_left(gb) < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (mask == 0x10000) {
|
|
bitbuf = bytestream2_get_le16u(gb);
|
|
mask = 1;
|
|
}
|
|
if (frame_end - frame < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (bitbuf & mask) {
|
|
v = bytestream2_get_le16(gb);
|
|
offset = (v & 0x1FFF) << 1;
|
|
count = ((v >> 13) + 2) << 1;
|
|
if (frame - frame_start < offset || frame_end - frame < count)
|
|
return AVERROR_INVALIDDATA;
|
|
av_memcpy_backptr(frame, offset, count);
|
|
frame += count;
|
|
} else {
|
|
*frame++ = bytestream2_get_byte(gb);
|
|
*frame++ = bytestream2_get_byte(gb);
|
|
}
|
|
mask <<= 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
const uint8_t *frame_start = frame;
|
|
const uint8_t *frame_end = frame + width * height;
|
|
int mask = 0x10000, bitbuf = 0;
|
|
int v, offset, count, segments;
|
|
|
|
segments = bytestream2_get_le16(gb);
|
|
while (segments--) {
|
|
if (bytestream2_get_bytes_left(gb) < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (mask == 0x10000) {
|
|
bitbuf = bytestream2_get_le16u(gb);
|
|
mask = 1;
|
|
}
|
|
if (frame_end - frame < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (bitbuf & mask) {
|
|
v = bytestream2_get_le16(gb);
|
|
offset = (v & 0x1FFF) << 1;
|
|
count = ((v >> 13) + 2) << 1;
|
|
if (frame - frame_start < offset || frame_end - frame < count)
|
|
return AVERROR_INVALIDDATA;
|
|
av_memcpy_backptr(frame, offset, count);
|
|
frame += count;
|
|
} else if (bitbuf & (mask << 1)) {
|
|
frame += bytestream2_get_le16(gb);
|
|
} else {
|
|
*frame++ = bytestream2_get_byte(gb);
|
|
*frame++ = bytestream2_get_byte(gb);
|
|
}
|
|
mask <<= 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
const uint8_t *frame_start = frame;
|
|
const uint8_t *frame_end = frame + width * height;
|
|
int mask = 0x10000, bitbuf = 0;
|
|
int i, v, offset, count, segments;
|
|
|
|
if ((width | height) & 1)
|
|
return AVERROR_INVALIDDATA;
|
|
segments = bytestream2_get_le16(gb);
|
|
while (segments--) {
|
|
if (bytestream2_get_bytes_left(gb) < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (mask == 0x10000) {
|
|
bitbuf = bytestream2_get_le16u(gb);
|
|
mask = 1;
|
|
}
|
|
|
|
if (bitbuf & mask) {
|
|
v = bytestream2_get_le16(gb);
|
|
offset = (v & 0x1FFF) << 2;
|
|
count = ((v >> 13) + 2) << 1;
|
|
if (frame - frame_start < offset || frame_end - frame < count*2 + width)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < count; i++) {
|
|
frame[0] = frame[1] =
|
|
frame[width] = frame[width + 1] = frame[-offset];
|
|
|
|
frame += 2;
|
|
}
|
|
} else if (bitbuf & (mask << 1)) {
|
|
v = bytestream2_get_le16(gb)*2;
|
|
if (frame - frame_end < v)
|
|
return AVERROR_INVALIDDATA;
|
|
frame += v;
|
|
} else {
|
|
if (width < 4 || frame_end - frame < width + 4)
|
|
return AVERROR_INVALIDDATA;
|
|
frame[0] = frame[1] =
|
|
frame[width] = frame[width + 1] = bytestream2_get_byte(gb);
|
|
frame += 2;
|
|
frame[0] = frame[1] =
|
|
frame[width] = frame[width + 1] = bytestream2_get_byte(gb);
|
|
frame += 2;
|
|
}
|
|
mask <<= 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_bdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
uint8_t *line_ptr;
|
|
int count, lines, segments;
|
|
|
|
count = bytestream2_get_le16(gb);
|
|
if (count >= height)
|
|
return AVERROR_INVALIDDATA;
|
|
frame += width * count;
|
|
lines = bytestream2_get_le16(gb);
|
|
if (count + lines > height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
while (lines--) {
|
|
if (bytestream2_get_bytes_left(gb) < 1)
|
|
return AVERROR_INVALIDDATA;
|
|
line_ptr = frame;
|
|
frame += width;
|
|
segments = bytestream2_get_byteu(gb);
|
|
while (segments--) {
|
|
if (frame - line_ptr <= bytestream2_peek_byte(gb))
|
|
return AVERROR_INVALIDDATA;
|
|
line_ptr += bytestream2_get_byte(gb);
|
|
count = (int8_t)bytestream2_get_byte(gb);
|
|
if (count >= 0) {
|
|
if (frame - line_ptr < count)
|
|
return AVERROR_INVALIDDATA;
|
|
if (bytestream2_get_buffer(gb, line_ptr, count) != count)
|
|
return AVERROR_INVALIDDATA;
|
|
} else {
|
|
count = -count;
|
|
if (frame - line_ptr < count)
|
|
return AVERROR_INVALIDDATA;
|
|
memset(line_ptr, bytestream2_get_byte(gb), count);
|
|
}
|
|
line_ptr += count;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
const uint8_t *frame_end = frame + width * height;
|
|
uint8_t *line_ptr;
|
|
int count, i, v, lines, segments;
|
|
int y = 0;
|
|
|
|
lines = bytestream2_get_le16(gb);
|
|
if (lines > height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
while (lines--) {
|
|
if (bytestream2_get_bytes_left(gb) < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
segments = bytestream2_get_le16u(gb);
|
|
while ((segments & 0xC000) == 0xC000) {
|
|
unsigned skip_lines = -(int16_t)segments;
|
|
int64_t delta = -((int16_t)segments * (int64_t)width);
|
|
if (frame_end - frame <= delta || y + lines + skip_lines > height)
|
|
return AVERROR_INVALIDDATA;
|
|
frame += delta;
|
|
y += skip_lines;
|
|
segments = bytestream2_get_le16(gb);
|
|
}
|
|
|
|
if (frame_end <= frame)
|
|
return AVERROR_INVALIDDATA;
|
|
if (segments & 0x8000) {
|
|
frame[width - 1] = segments & 0xFF;
|
|
segments = bytestream2_get_le16(gb);
|
|
}
|
|
line_ptr = frame;
|
|
if (frame_end - frame < width)
|
|
return AVERROR_INVALIDDATA;
|
|
frame += width;
|
|
y++;
|
|
while (segments--) {
|
|
if (frame - line_ptr <= bytestream2_peek_byte(gb))
|
|
return AVERROR_INVALIDDATA;
|
|
line_ptr += bytestream2_get_byte(gb);
|
|
count = (int8_t)bytestream2_get_byte(gb);
|
|
if (count >= 0) {
|
|
if (frame - line_ptr < count * 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2)
|
|
return AVERROR_INVALIDDATA;
|
|
line_ptr += count * 2;
|
|
} else {
|
|
count = -count;
|
|
if (frame - line_ptr < count * 2)
|
|
return AVERROR_INVALIDDATA;
|
|
v = bytestream2_get_le16(gb);
|
|
for (i = 0; i < count; i++)
|
|
bytestream_put_le16(&line_ptr, v);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
const uint8_t *frame_end = frame + width * height;
|
|
uint32_t segments = bytestream2_get_le32(gb);
|
|
int skip, copy;
|
|
|
|
while (segments--) {
|
|
if (bytestream2_get_bytes_left(gb) < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
copy = bytestream2_get_byteu(gb) * 2;
|
|
skip = bytestream2_get_byteu(gb) * 2;
|
|
if (frame_end - frame < copy + skip ||
|
|
bytestream2_get_bytes_left(gb) < copy)
|
|
return AVERROR_INVALIDDATA;
|
|
frame += skip;
|
|
bytestream2_get_buffer(gb, frame, copy);
|
|
frame += copy;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height)
|
|
{
|
|
memset(frame, 0, width * height);
|
|
return 0;
|
|
}
|
|
|
|
|
|
typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int height);
|
|
|
|
static const chunk_decoder decoder[8] = {
|
|
decode_copy, decode_tsw1, decode_bdlt, decode_wdlt,
|
|
decode_tdlt, decode_dsw1, decode_blck, decode_dds1,
|
|
};
|
|
|
|
static const char chunk_name[8][5] = {
|
|
"COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1"
|
|
};
|
|
|
|
static int dfa_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
DfaContext *s = avctx->priv_data;
|
|
GetByteContext gb;
|
|
const uint8_t *buf = avpkt->data;
|
|
uint32_t chunk_type, chunk_size;
|
|
uint8_t *dst;
|
|
int ret;
|
|
int i, pal_elems;
|
|
int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0;
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
|
|
bytestream2_init(&gb, avpkt->data, avpkt->size);
|
|
while (bytestream2_get_bytes_left(&gb) > 0) {
|
|
if (bytestream2_get_bytes_left(&gb) < 12)
|
|
return AVERROR_INVALIDDATA;
|
|
bytestream2_skip(&gb, 4);
|
|
chunk_size = bytestream2_get_le32(&gb);
|
|
chunk_type = bytestream2_get_le32(&gb);
|
|
if (!chunk_type)
|
|
break;
|
|
if (chunk_type == 1) {
|
|
pal_elems = FFMIN(chunk_size / 3, 256);
|
|
for (i = 0; i < pal_elems; i++) {
|
|
s->pal[i] = bytestream2_get_be24(&gb) << 2;
|
|
s->pal[i] |= 0xFFU << 24 | (s->pal[i] >> 6) & 0x30303;
|
|
}
|
|
frame->palette_has_changed = 1;
|
|
} else if (chunk_type <= 9) {
|
|
if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
|
|
chunk_name[chunk_type - 2]);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
} else {
|
|
av_log(avctx, AV_LOG_WARNING,
|
|
"Ignoring unknown chunk type %"PRIu32"\n",
|
|
chunk_type);
|
|
}
|
|
buf += chunk_size;
|
|
}
|
|
|
|
buf = s->frame_buf;
|
|
dst = frame->data[0];
|
|
for (i = 0; i < avctx->height; i++) {
|
|
if(version == 0x100) {
|
|
int j;
|
|
for(j = 0; j < avctx->width; j++) {
|
|
dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) +
|
|
((j&3)*(avctx->height/4) + (i/4))*avctx->width];
|
|
}
|
|
} else {
|
|
memcpy(dst, buf, avctx->width);
|
|
buf += avctx->width;
|
|
}
|
|
dst += frame->linesize[0];
|
|
}
|
|
memcpy(frame->data[1], s->pal, sizeof(s->pal));
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int dfa_decode_end(AVCodecContext *avctx)
|
|
{
|
|
DfaContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->frame_buf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_dfa_decoder = {
|
|
.name = "dfa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_DFA,
|
|
.priv_data_size = sizeof(DfaContext),
|
|
.init = dfa_decode_init,
|
|
.close = dfa_decode_end,
|
|
.decode = dfa_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|