mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 03:34:56 +00:00
283 lines
8.0 KiB
C
283 lines
8.0 KiB
C
/*
|
|
* Beam Software VB decoder
|
|
* Copyright (c) 2007 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 vb.c
|
|
* VB Video decoder
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
|
|
enum VBFlags{
|
|
VB_HAS_GMC = 0x01,
|
|
VB_HAS_AUDIO = 0x04,
|
|
VB_HAS_VIDEO = 0x08,
|
|
VB_HAS_PALETTE = 0x10,
|
|
VB_HAS_LENGTH = 0x20
|
|
};
|
|
|
|
typedef struct VBDecContext {
|
|
AVCodecContext *avctx;
|
|
AVFrame pic;
|
|
|
|
uint8_t *frame, *prev_frame;
|
|
uint32_t pal[256];
|
|
uint8_t *stream;
|
|
} VBDecContext;
|
|
|
|
static const uint16_t vb_patterns[64] = {
|
|
0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8,
|
|
0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00,
|
|
0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222,
|
|
0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC,
|
|
0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113,
|
|
0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC,
|
|
0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63,
|
|
0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C
|
|
};
|
|
|
|
static void vb_decode_palette(VBDecContext *c)
|
|
{
|
|
int start, size, i;
|
|
|
|
start = bytestream_get_byte(&c->stream);
|
|
size = (bytestream_get_byte(&c->stream) - 1) & 0xFF;
|
|
if(start + size > 255){
|
|
av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
|
|
return;
|
|
}
|
|
for(i = start; i <= start + size; i++)
|
|
c->pal[i] = bytestream_get_be24(&c->stream);
|
|
}
|
|
|
|
static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
|
|
{
|
|
return buf >= start && buf < end;
|
|
}
|
|
|
|
static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
|
|
{
|
|
return buf >= start && (buf + 4) <= end;
|
|
}
|
|
|
|
static int vb_decode_framedata(VBDecContext *c, uint8_t *buf, int offset)
|
|
{
|
|
uint8_t *prev, *cur;
|
|
int blk, blocks, t, blk2;
|
|
int blocktypes = 0;
|
|
int x, y, a, b;
|
|
int pattype, pattern;
|
|
const int width = c->avctx->width;
|
|
uint8_t *pstart = c->prev_frame;
|
|
uint8_t *pend = c->prev_frame + width*c->avctx->height;
|
|
|
|
prev = c->prev_frame + offset;
|
|
cur = c->frame;
|
|
|
|
blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
|
|
blk2 = 0;
|
|
for(blk = 0; blk < blocks; blk++){
|
|
if(!(blk & 3))
|
|
blocktypes = bytestream_get_byte(&buf);
|
|
switch(blocktypes & 0xC0){
|
|
case 0x00: //skip
|
|
for(y = 0; y < 4; y++)
|
|
if(check_line(prev + y*width, pstart, pend))
|
|
memcpy(cur + y*width, prev + y*width, 4);
|
|
else
|
|
memset(cur + y*width, 0, 4);
|
|
break;
|
|
case 0x40:
|
|
t = bytestream_get_byte(&buf);
|
|
if(!t){ //raw block
|
|
for(y = 0; y < 4; y++)
|
|
memcpy(cur + y*width, buf + y*4, 4);
|
|
buf += 16;
|
|
}else{ // motion compensation
|
|
x = ((t & 0xF)^8) - 8;
|
|
y = ((t >> 4) ^8) - 8;
|
|
t = x + y*width;
|
|
for(y = 0; y < 4; y++)
|
|
if(check_line(prev + t + y*width, pstart, pend))
|
|
memcpy(cur + y*width, prev + t + y*width, 4);
|
|
else
|
|
memset(cur + y*width, 0, 4);
|
|
}
|
|
break;
|
|
case 0x80: // fill
|
|
t = bytestream_get_byte(&buf);
|
|
for(y = 0; y < 4; y++)
|
|
memset(cur + y*width, t, 4);
|
|
break;
|
|
case 0xC0: // pattern fill
|
|
t = bytestream_get_byte(&buf);
|
|
pattype = t >> 6;
|
|
pattern = vb_patterns[t & 0x3F];
|
|
switch(pattype){
|
|
case 0:
|
|
a = bytestream_get_byte(&buf);
|
|
b = bytestream_get_byte(&buf);
|
|
for(y = 0; y < 4; y++)
|
|
for(x = 0; x < 4; x++, pattern >>= 1)
|
|
cur[x + y*width] = (pattern & 1) ? b : a;
|
|
break;
|
|
case 1:
|
|
pattern = ~pattern;
|
|
case 2:
|
|
a = bytestream_get_byte(&buf);
|
|
for(y = 0; y < 4; y++)
|
|
for(x = 0; x < 4; x++, pattern >>= 1)
|
|
if(pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
|
|
cur[x + y*width] = prev[x + y*width];
|
|
else
|
|
cur[x + y*width] = a;
|
|
break;
|
|
case 3:
|
|
av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n",blk);
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
blocktypes <<= 2;
|
|
cur += 4;
|
|
prev += 4;
|
|
blk2++;
|
|
if(blk2 == (width >> 2)){
|
|
blk2 = 0;
|
|
cur += width * 3;
|
|
prev += width * 3;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
|
|
{
|
|
VBDecContext * const c = avctx->priv_data;
|
|
uint8_t *outptr, *srcptr;
|
|
int i, j;
|
|
int flags;
|
|
uint32_t size;
|
|
int rest = buf_size;
|
|
int offset = 0;
|
|
|
|
c->stream = buf;
|
|
flags = bytestream_get_le16(&c->stream);
|
|
rest -= 2;
|
|
|
|
if(flags & VB_HAS_GMC){
|
|
i = (int16_t)bytestream_get_le16(&c->stream);
|
|
j = (int16_t)bytestream_get_le16(&c->stream);
|
|
offset = i + j * avctx->width;
|
|
rest -= 4;
|
|
}
|
|
if(flags & VB_HAS_VIDEO){
|
|
size = bytestream_get_le32(&c->stream);
|
|
if(size > rest){
|
|
av_log(avctx, AV_LOG_ERROR, "Frame size is too big\n");
|
|
return -1;
|
|
}
|
|
vb_decode_framedata(c, c->stream, offset);
|
|
c->stream += size - 4;
|
|
rest -= size;
|
|
}
|
|
if(flags & VB_HAS_PALETTE){
|
|
size = bytestream_get_le32(&c->stream);
|
|
if(size > rest){
|
|
av_log(avctx, AV_LOG_ERROR, "Palette size is too big\n");
|
|
return -1;
|
|
}
|
|
vb_decode_palette(c);
|
|
rest -= size;
|
|
}
|
|
|
|
memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
|
|
c->pic.palette_has_changed = flags & VB_HAS_PALETTE;
|
|
|
|
outptr = c->pic.data[0];
|
|
srcptr = c->frame;
|
|
|
|
for(i = 0; i < avctx->height; i++){
|
|
memcpy(outptr, srcptr, avctx->width);
|
|
srcptr += avctx->width;
|
|
outptr += c->pic.linesize[0];
|
|
}
|
|
|
|
FFSWAP(uint8_t*, c->frame, c->prev_frame);
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = c->pic;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static int decode_init(AVCodecContext *avctx)
|
|
{
|
|
VBDecContext * const c = avctx->priv_data;
|
|
|
|
c->avctx = avctx;
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
|
|
if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
c->pic.reference = 1;
|
|
if(avctx->get_buffer(avctx, &c->pic) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
c->frame = av_malloc( avctx->width * avctx->height);
|
|
c->prev_frame = av_malloc( avctx->width * avctx->height);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_end(AVCodecContext *avctx)
|
|
{
|
|
VBDecContext *c = avctx->priv_data;
|
|
|
|
av_freep(&c->frame);
|
|
av_freep(&c->prev_frame);
|
|
if(c->pic.data[0])
|
|
avctx->release_buffer(avctx, &c->pic);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec vb_decoder = {
|
|
"vb",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_VB,
|
|
sizeof(VBDecContext),
|
|
decode_init,
|
|
NULL,
|
|
decode_end,
|
|
decode_frame
|
|
};
|
|
|