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BFI video decoder.

Patch by Sisir Koppaka sisir koppaka gmail
Original thread: [FFmpeg-devel] BFI video decoder
Date: 04/17/2008 04:25 PM

Originally committed as revision 12890 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Sisir Koppaka 2008-04-18 08:43:11 +00:00 committed by Benoit Fouet
parent 93826f561d
commit 2003d3da1a
5 changed files with 185 additions and 1 deletions

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@ -120,6 +120,7 @@ version <next>
- 8SVX audio decoder
- BFI demuxer
- MAXIS EA XA (.xa) demuxer / decoder
- BFI video decoder
version 0.4.9-pre1:

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@ -137,7 +137,7 @@ different game cutscenes repacked for use with ScummVM.
@tab Audio and video format used in some games by Entertainment Software Partners
@item IFF @tab @tab X
@tab Interchange File Format
@item BFI @tab @tab
@item BFI @tab @tab X
@tab Brute Force & Ignorance, used in Flash Traffic: City of Angels
@end multitable

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@ -42,6 +42,7 @@ OBJS-$(CONFIG_ASV2_ENCODER) += asv1.o mpeg12data.o
OBJS-$(CONFIG_ATRAC3_DECODER) += atrac3.o mdct.o fft.o
OBJS-$(CONFIG_AVS_DECODER) += avs.o
OBJS-$(CONFIG_BETHSOFTVID_DECODER) += bethsoftvideo.o
OBJS-$(CONFIG_BFI_DECODER) += bfi.o
OBJS-$(CONFIG_BMP_DECODER) += bmp.o
OBJS-$(CONFIG_BMP_ENCODER) += bmpenc.o
OBJS-$(CONFIG_C93_DECODER) += c93.o

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@ -66,6 +66,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (ASV2, asv2);
REGISTER_DECODER (AVS, avs);
REGISTER_DECODER (BETHSOFTVID, bethsoftvid);
REGISTER_DECODER (BFI, bfi);
REGISTER_ENCDEC (BMP, bmp);
REGISTER_DECODER (C93, c93);
REGISTER_DECODER (CAVS, cavs);

181
libavcodec/bfi.c Normal file
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@ -0,0 +1,181 @@
/*
* Brute Force & Ignorance (BFI) video decoder
* Copyright (c) 2008 Sisir Koppaka
*
* 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 bfi.c
* @brief Brute Force & Ignorance (.bfi) video decoder
* @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
* @sa http://wiki.multimedia.cx/index.php?title=BFI
*/
#include "avcodec.h"
#include "common.h"
#include "bytestream.h"
typedef struct BFIContext {
AVCodecContext *avctx;
AVFrame frame;
uint8_t *dst;
} BFIContext;
static int bfi_decode_init(AVCodecContext * avctx)
{
BFIContext *bfi = avctx->priv_data;
avctx->pix_fmt = PIX_FMT_PAL8;
bfi->dst = av_mallocz(avctx->width * avctx->height);
return 0;
}
static int bfi_decode_frame(AVCodecContext * avctx, void *data,
int *data_size, const uint8_t * buf,
int buf_size)
{
BFIContext *bfi = avctx->priv_data;
uint8_t *dst = bfi->dst;
uint8_t *src, *dst_offset, colour1, colour2;
uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
uint32_t *pal;
int i, j, height = avctx->height;
if (bfi->frame.data[0])
avctx->release_buffer(avctx, &bfi->frame);
bfi->frame.reference = 1;
if (avctx->get_buffer(avctx, &bfi->frame) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
/* Set frame parameters and palette, if necessary */
if (!avctx->frame_number) {
bfi->frame.pict_type = FF_I_TYPE;
bfi->frame.key_frame = 1;
/* Setting the palette */
if(avctx->extradata_size>768) {
av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n");
return -1;
}
pal = (uint32_t *) bfi->frame.data[1];
for (i = 0; i < avctx->extradata_size / 3; i++) {
int shift = 16;
*pal = 0;
for (j = 0; j < 3; j++, shift -= 8)
*pal +=
((avctx->extradata[i * 3 + j] << 2) |
(avctx->extradata[i * 3 + j] >> 4)) << shift;
pal++;
}
bfi->frame.palette_has_changed = 1;
} else {
bfi->frame.pict_type = FF_P_TYPE;
bfi->frame.key_frame = 0;
}
buf += 4; //Unpacked size, not required.
while (dst != frame_end) {
static const uint8_t lentab[4]={0,2,0,1};
unsigned int byte = *buf++, offset;
unsigned int code = byte >> 6;
unsigned int length = byte & ~0xC0;
/* Get length and offset(if required) */
if (length == 0) {
if (code == 1) {
length = bytestream_get_byte(&buf);
offset = bytestream_get_le16(&buf);
} else {
length = bytestream_get_le16(&buf);
if (code == 2 && length == 0)
break;
}
} else {
if (code == 1)
offset = bytestream_get_byte(&buf);
}
/* Do boundary check */
if (dst + (length<<lentab[code]) > frame_end)
break;
switch (code) {
case 0: //Normal Chain
bytestream_get_buffer(&buf, dst, length);
dst += length;
break;
case 1: //Back Chain
dst_offset = dst - offset;
length *= 4; //Convert dwords to bytes.
if (dst_offset < bfi->dst)
break;
while (length--)
*dst++ = *dst_offset++;
break;
case 2: //Skip Chain
dst += length;
break;
case 3: //Fill Chain
colour1 = bytestream_get_byte(&buf);
colour2 = bytestream_get_byte(&buf);
while (length--) {
*dst++ = colour1;
*dst++ = colour2;
}
break;
}
}
src = bfi->dst;
dst = bfi->frame.data[0];
while (height--) {
memcpy(dst, src, avctx->width);
src += avctx->width;
dst += bfi->frame.linesize[0];
}
*data_size = sizeof(AVFrame);
*(AVFrame *) data = bfi->frame;
return buf_size;
}
static int bfi_decode_close(AVCodecContext * avctx)
{
BFIContext *bfi = avctx->priv_data;
if (bfi->frame.data[0])
avctx->release_buffer(avctx, &bfi->frame);
av_free(bfi->dst);
return 0;
}
AVCodec bfi_decoder = {
.name = "bfi",
.type = CODEC_TYPE_VIDEO,
.id = CODEC_ID_BFI,
.priv_data_size = sizeof(BFIContext),
.init = bfi_decode_init,
.close = bfi_decode_close,
.decode = bfi_decode_frame,
};