mirror of
https://git.videolan.org/git/ffmpeg.git
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197 lines
5.8 KiB
C
197 lines
5.8 KiB
C
/*
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* Brute Force & Ignorance (BFI) video decoder
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* Copyright (c) 2008 Sisir Koppaka
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief Brute Force & Ignorance (.bfi) video decoder
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* @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
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* @see http://wiki.multimedia.cx/index.php?title=BFI
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*/
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "bytestream.h"
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typedef struct BFIContext {
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AVCodecContext *avctx;
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AVFrame frame;
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uint8_t *dst;
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} BFIContext;
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static av_cold int bfi_decode_init(AVCodecContext *avctx)
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{
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BFIContext *bfi = avctx->priv_data;
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avctx->pix_fmt = PIX_FMT_PAL8;
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bfi->dst = av_mallocz(avctx->width * avctx->height);
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return 0;
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}
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static int bfi_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt)
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{
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GetByteContext g;
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int buf_size = avpkt->size;
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BFIContext *bfi = avctx->priv_data;
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uint8_t *dst = bfi->dst;
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uint8_t *src, *dst_offset, colour1, colour2;
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uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
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uint32_t *pal;
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int i, j, height = avctx->height;
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if (bfi->frame.data[0])
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avctx->release_buffer(avctx, &bfi->frame);
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bfi->frame.reference = 1;
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if (avctx->get_buffer(avctx, &bfi->frame) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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bytestream2_init(&g, avpkt->data, buf_size);
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/* Set frame parameters and palette, if necessary */
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if (!avctx->frame_number) {
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bfi->frame.pict_type = AV_PICTURE_TYPE_I;
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bfi->frame.key_frame = 1;
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/* Setting the palette */
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if (avctx->extradata_size > 768) {
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av_log(NULL, AV_LOG_ERROR, "Palette is too large.\n");
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return -1;
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}
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pal = (uint32_t *)bfi->frame.data[1];
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for (i = 0; i < avctx->extradata_size / 3; i++) {
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int shift = 16;
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*pal = 0;
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for (j = 0; j < 3; j++, shift -= 8)
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*pal +=
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((avctx->extradata[i * 3 + j] << 2) |
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(avctx->extradata[i * 3 + j] >> 4)) << shift;
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pal++;
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}
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bfi->frame.palette_has_changed = 1;
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} else {
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bfi->frame.pict_type = AV_PICTURE_TYPE_P;
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bfi->frame.key_frame = 0;
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}
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bytestream2_skip(&g, 4); // Unpacked size, not required.
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while (dst != frame_end) {
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static const uint8_t lentab[4] = { 0, 2, 0, 1 };
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unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset);
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unsigned int code = byte >> 6;
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unsigned int length = byte & ~0xC0;
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if (!bytestream2_get_bytes_left(&g)) {
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av_log(avctx, AV_LOG_ERROR,
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"Input resolution larger than actual frame.\n");
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return -1;
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}
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/* Get length and offset(if required) */
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if (length == 0) {
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if (code == 1) {
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length = bytestream2_get_byte(&g);
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offset = bytestream2_get_le16(&g);
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} else {
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length = bytestream2_get_le16(&g);
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if (code == 2 && length == 0)
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break;
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}
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} else {
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if (code == 1)
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offset = bytestream2_get_byte(&g);
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}
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/* Do boundary check */
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if (dst + (length << lentab[code]) > frame_end)
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break;
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switch (code) {
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case 0: //Normal Chain
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if (length >= bytestream2_get_bytes_left(&g)) {
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av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
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return -1;
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}
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bytestream2_get_buffer(&g, dst, length);
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dst += length;
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break;
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case 1: //Back Chain
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dst_offset = dst - offset;
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length *= 4; //Convert dwords to bytes.
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if (dst_offset < bfi->dst)
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break;
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while (length--)
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*dst++ = *dst_offset++;
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break;
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case 2: //Skip Chain
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dst += length;
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break;
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case 3: //Fill Chain
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colour1 = bytestream2_get_byte(&g);
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colour2 = bytestream2_get_byte(&g);
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while (length--) {
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*dst++ = colour1;
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*dst++ = colour2;
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}
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break;
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}
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}
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src = bfi->dst;
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dst = bfi->frame.data[0];
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while (height--) {
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memcpy(dst, src, avctx->width);
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src += avctx->width;
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dst += bfi->frame.linesize[0];
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame *)data = bfi->frame;
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return buf_size;
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}
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static av_cold int bfi_decode_close(AVCodecContext * avctx)
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{
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BFIContext *bfi = avctx->priv_data;
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if (bfi->frame.data[0])
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avctx->release_buffer(avctx, &bfi->frame);
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av_free(bfi->dst);
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return 0;
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}
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AVCodec ff_bfi_decoder = {
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.name = "bfi",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_BFI,
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.priv_data_size = sizeof(BFIContext),
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.init = bfi_decode_init,
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.close = bfi_decode_close,
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.decode = bfi_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
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};
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