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/* |
* 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 |
*/ |
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/** |
* @file |
* VB Video decoder |
*/ |
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#include <stdio.h> |
#include <stdlib.h> |
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#include "avcodec.h" |
#include "bytestream.h" |
#include "internal.h" |
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enum VBFlags { |
VB_HAS_GMC = 0x01, |
VB_HAS_AUDIO = 0x04, |
VB_HAS_VIDEO = 0x08, |
VB_HAS_PALETTE = 0x10, |
VB_HAS_LENGTH = 0x20 |
}; |
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typedef struct VBDecContext { |
AVCodecContext *avctx; |
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uint8_t *frame, *prev_frame; |
uint32_t pal[AVPALETTE_COUNT]; |
GetByteContext stream; |
} VBDecContext; |
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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 |
}; |
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static void vb_decode_palette(VBDecContext *c, int data_size) |
{ |
int start, size, i; |
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start = bytestream2_get_byte(&c->stream); |
size = (bytestream2_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; |
} |
if (size*3+2 > data_size) { |
av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n"); |
return; |
} |
for (i = start; i <= start + size; i++) |
c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream); |
} |
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static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end) |
{ |
return buf >= start && buf < end; |
} |
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static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end) |
{ |
return buf >= start && (buf + 4) <= end; |
} |
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static int vb_decode_framedata(VBDecContext *c, int offset) |
{ |
GetByteContext g; |
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; |
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g = c->stream; |
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prev = c->prev_frame + offset; |
cur = c->frame; |
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blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2); |
blk2 = 0; |
for (blk = 0; blk < blocks; blk++) { |
if (!(blk & 3)) { |
blocktypes = bytestream2_get_byte(&g); |
} |
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 = bytestream2_get_byte(&g); |
if (!t) { //raw block |
if (bytestream2_get_bytes_left(&g) < 16) { |
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n"); |
return AVERROR_INVALIDDATA; |
} |
for (y = 0; y < 4; y++) |
bytestream2_get_buffer(&g, cur + y * width, 4); |
} 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 = bytestream2_get_byte(&g); |
for (y = 0; y < 4; y++) |
memset(cur + y*width, t, 4); |
break; |
case 0xC0: // pattern fill |
t = bytestream2_get_byte(&g); |
pattype = t >> 6; |
pattern = vb_patterns[t & 0x3F]; |
switch (pattype) { |
case 0: |
a = bytestream2_get_byte(&g); |
b = bytestream2_get_byte(&g); |
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 = bytestream2_get_byte(&g); |
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 AVERROR_INVALIDDATA; |
} |
break; |
} |
blocktypes <<= 2; |
cur += 4; |
prev += 4; |
blk2++; |
if (blk2 == (width >> 2)) { |
blk2 = 0; |
cur += width * 3; |
prev += width * 3; |
} |
} |
return 0; |
} |
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
VBDecContext * const c = avctx->priv_data; |
AVFrame *frame = data; |
uint8_t *outptr, *srcptr; |
int i, j, ret; |
int flags; |
uint32_t size; |
int offset = 0; |
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bytestream2_init(&c->stream, avpkt->data, avpkt->size); |
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
return ret; |
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flags = bytestream2_get_le16(&c->stream); |
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if (flags & VB_HAS_GMC) { |
i = (int16_t)bytestream2_get_le16(&c->stream); |
j = (int16_t)bytestream2_get_le16(&c->stream); |
offset = i + j * avctx->width; |
} |
if (flags & VB_HAS_VIDEO) { |
size = bytestream2_get_le32(&c->stream); |
if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){ |
av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n"); |
return -1; |
} |
vb_decode_framedata(c, offset); |
bytestream2_skip(&c->stream, size - 4); |
} |
if (flags & VB_HAS_PALETTE) { |
size = bytestream2_get_le32(&c->stream); |
vb_decode_palette(c, size); |
} |
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memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); |
frame->palette_has_changed = flags & VB_HAS_PALETTE; |
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outptr = frame->data[0]; |
srcptr = c->frame; |
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for (i = 0; i < avctx->height; i++) { |
memcpy(outptr, srcptr, avctx->width); |
srcptr += avctx->width; |
outptr += frame->linesize[0]; |
} |
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FFSWAP(uint8_t*, c->frame, c->prev_frame); |
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*got_frame = 1; |
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/* always report that the buffer was completely consumed */ |
return avpkt->size; |
} |
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static av_cold int decode_init(AVCodecContext *avctx) |
{ |
VBDecContext * const c = avctx->priv_data; |
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c->avctx = avctx; |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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c->frame = av_mallocz(avctx->width * avctx->height); |
c->prev_frame = av_mallocz(avctx->width * avctx->height); |
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return 0; |
} |
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static av_cold int decode_end(AVCodecContext *avctx) |
{ |
VBDecContext *c = avctx->priv_data; |
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av_freep(&c->frame); |
av_freep(&c->prev_frame); |
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return 0; |
} |
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AVCodec ff_vb_decoder = { |
.name = "vb", |
.long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_VB, |
.priv_data_size = sizeof(VBDecContext), |
.init = decode_init, |
.close = decode_end, |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |