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/*
* 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
* @brief Brute Force & Ignorance (.bfi) video decoder
* @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
* @see http://wiki.multimedia.cx/index.php?title=BFI
*/
#include "libavutil/common.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
typedef struct BFIContext {
AVCodecContext *avctx;
uint8_t *dst;
uint32_t pal[256];
} BFIContext;
static av_cold int bfi_decode_init(AVCodecContext *avctx)
{
BFIContext *bfi = avctx->priv_data;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
bfi->dst = av_mallocz(avctx->width * avctx->height);
if (!bfi->dst)
return AVERROR(ENOMEM);
return 0;
}
static int bfi_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
AVFrame *frame = data;
GetByteContext g;
int buf_size = avpkt->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, ret, height = avctx->height;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
bytestream2_init(&g, avpkt->data, buf_size);
/* Set frame parameters and palette, if necessary */
if (!avctx->frame_number) {
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
/* Setting the palette */
if (avctx->extradata_size > 768) {
av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n");
return AVERROR_INVALIDDATA;
}
pal = (uint32_t *)frame->data[1];
for (i = 0; i < avctx->extradata_size / 3; i++) {
int shift = 16;
*pal = 0xFFU << 24;
for (j = 0; j < 3; j++, shift -= 8)
*pal += ((avctx->extradata[i * 3 + j] << 2) |
(avctx->extradata[i * 3 + j] >> 4)) << shift;
pal++;
}
memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
frame->palette_has_changed = 1;
} else {
frame->pict_type = AV_PICTURE_TYPE_P;
frame->key_frame = 0;
frame->palette_has_changed = 0;
memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
}
bytestream2_skip(&g, 4); // Unpacked size, not required.
while (dst != frame_end) {
static const uint8_t lentab[4] = { 0, 2, 0, 1 };
unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset);
unsigned int code = byte >> 6;
unsigned int length = byte & ~0xC0;
if (!bytestream2_get_bytes_left(&g)) {
av_log(avctx, AV_LOG_ERROR,
"Input resolution larger than actual frame.\n");
return AVERROR_INVALIDDATA;
}
/* Get length and offset (if required) */
if (length == 0) {
if (code == 1) {
length = bytestream2_get_byte(&g);
offset = bytestream2_get_le16(&g);
} else {
length = bytestream2_get_le16(&g);
if (code == 2 && length == 0)
break;
}
} else {
if (code == 1)
offset = bytestream2_get_byte(&g);
}
/* Do boundary check */
if (dst + (length << lentab[code]) > frame_end)
break;
switch (code) {
case 0: // normal chain
if (length >= bytestream2_get_bytes_left(&g)) {
av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
return AVERROR_INVALIDDATA;
}
bytestream2_get_buffer(&g, 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 = bytestream2_get_byte(&g);
colour2 = bytestream2_get_byte(&g);
while (length--) {
*dst++ = colour1;
*dst++ = colour2;
}
break;
}
}
src = bfi->dst;
dst = frame->data[0];
while (height--) {
memcpy(dst, src, avctx->width);
src += avctx->width;
dst += frame->linesize[0];
}
*got_frame = 1;
return buf_size;
}
static av_cold int bfi_decode_close(AVCodecContext *avctx)
{
BFIContext *bfi = avctx->priv_data;
av_free(bfi->dst);
return 0;
}
AVCodec ff_bfi_decoder = {
.name = "bfi",
.long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_BFI,
.priv_data_size = sizeof(BFIContext),
.init = bfi_decode_init,
.close = bfi_decode_close,
.decode = bfi_decode_frame,
.capabilities = CODEC_CAP_DR1,
};
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