2 * Brute Force & Ignorance (BFI) video decoder
3 * Copyright (c) 2008 Sisir Koppaka
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * @brief Brute Force & Ignorance (.bfi) video decoder
25 * @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
26 * @sa http://wiki.multimedia.cx/index.php?title=BFI
29 #include "libavutil/common.h"
31 #include "bytestream.h"
33 typedef struct BFIContext {
34 AVCodecContext *avctx;
39 static av_cold int bfi_decode_init(AVCodecContext * avctx)
41 BFIContext *bfi = avctx->priv_data;
42 avctx->pix_fmt = PIX_FMT_PAL8;
43 bfi->dst = av_mallocz(avctx->width * avctx->height);
47 static int bfi_decode_frame(AVCodecContext * avctx, void *data,
48 int *data_size, AVPacket *avpkt)
50 const uint8_t *buf = avpkt->data, *buf_end = avpkt->data + avpkt->size;
51 int buf_size = avpkt->size;
52 BFIContext *bfi = avctx->priv_data;
53 uint8_t *dst = bfi->dst;
54 uint8_t *src, *dst_offset, colour1, colour2;
55 uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
57 int i, j, height = avctx->height;
59 if (bfi->frame.data[0])
60 avctx->release_buffer(avctx, &bfi->frame);
62 bfi->frame.reference = 1;
64 if (avctx->get_buffer(avctx, &bfi->frame) < 0) {
65 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
69 /* Set frame parameters and palette, if necessary */
70 if (!avctx->frame_number) {
71 bfi->frame.pict_type = FF_I_TYPE;
72 bfi->frame.key_frame = 1;
73 /* Setting the palette */
74 if(avctx->extradata_size>768) {
75 av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n");
78 pal = (uint32_t *) bfi->frame.data[1];
79 for (i = 0; i < avctx->extradata_size / 3; i++) {
82 for (j = 0; j < 3; j++, shift -= 8)
84 ((avctx->extradata[i * 3 + j] << 2) |
85 (avctx->extradata[i * 3 + j] >> 4)) << shift;
88 bfi->frame.palette_has_changed = 1;
90 bfi->frame.pict_type = FF_P_TYPE;
91 bfi->frame.key_frame = 0;
94 buf += 4; //Unpacked size, not required.
96 while (dst != frame_end) {
97 static const uint8_t lentab[4]={0,2,0,1};
98 unsigned int byte = *buf++, av_uninit(offset);
99 unsigned int code = byte >> 6;
100 unsigned int length = byte & ~0xC0;
102 if (buf >= buf_end) {
103 av_log(avctx, AV_LOG_ERROR, "Input resolution larger than actual frame.\n");
107 /* Get length and offset(if required) */
110 length = bytestream_get_byte(&buf);
111 offset = bytestream_get_le16(&buf);
113 length = bytestream_get_le16(&buf);
114 if (code == 2 && length == 0)
119 offset = bytestream_get_byte(&buf);
122 /* Do boundary check */
123 if (dst + (length<<lentab[code]) > frame_end)
128 case 0: //Normal Chain
129 if (length >= buf_end - buf) {
130 av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
133 bytestream_get_buffer(&buf, dst, length);
138 dst_offset = dst - offset;
139 length *= 4; //Convert dwords to bytes.
140 if (dst_offset < bfi->dst)
143 *dst++ = *dst_offset++;
151 colour1 = bytestream_get_byte(&buf);
152 colour2 = bytestream_get_byte(&buf);
163 dst = bfi->frame.data[0];
165 memcpy(dst, src, avctx->width);
167 dst += bfi->frame.linesize[0];
169 *data_size = sizeof(AVFrame);
170 *(AVFrame *) data = bfi->frame;
174 static av_cold int bfi_decode_close(AVCodecContext * avctx)
176 BFIContext *bfi = avctx->priv_data;
177 if (bfi->frame.data[0])
178 avctx->release_buffer(avctx, &bfi->frame);
183 AVCodec ff_bfi_decoder = {
185 .type = AVMEDIA_TYPE_VIDEO,
187 .priv_data_size = sizeof(BFIContext),
188 .init = bfi_decode_init,
189 .close = bfi_decode_close,
190 .decode = bfi_decode_frame,
191 .capabilities = CODEC_CAP_DR1,
192 .long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),