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FFmpeg/libavcodec/vb.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which 
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

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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
*/
/**
* @file libavcodec/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[AVPALETTE_COUNT];
const 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 data_size)
{
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;
}
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] = 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, const uint8_t *buf, int data_size, int offset)
{
uint8_t *prev, *cur;
const uint8_t* data_end = buf + data_size;
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)) {
if(buf >= data_end){
av_log(c->avctx, AV_LOG_ERROR, "Data pointer out of bounds\n");
return -1;
}
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
if(buf + 16 > data_end){
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
return -1;
}
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
if(buf + 2 > data_end){
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
return -1;
}
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, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->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;
if(c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
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->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, size, 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, size);
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 av_cold int decode_init(AVCodecContext *avctx)
{
VBDecContext * const c = avctx->priv_data;
c->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;
c->frame = av_mallocz(avctx->width * avctx->height);
c->prev_frame = av_mallocz(avctx->width * avctx->height);
return 0;
}
static av_cold 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",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_VB,
sizeof(VBDecContext),
decode_init,
NULL,
decode_end,
decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"),
};
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