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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
190 lines
6.0 KiB
C
190 lines
6.0 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "internal.h"
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typedef struct BFIContext {
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AVCodecContext *avctx;
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uint8_t *dst;
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uint32_t pal[256];
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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 = AV_PIX_FMT_PAL8;
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bfi->dst = av_mallocz(avctx->width * avctx->height);
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if (!bfi->dst)
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return AVERROR(ENOMEM);
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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 *got_frame, AVPacket *avpkt)
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{
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AVFrame *frame = data;
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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, ret, height = avctx->height;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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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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frame->pict_type = AV_PICTURE_TYPE_I;
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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(avctx, AV_LOG_ERROR, "Palette is too large.\n");
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return AVERROR_INVALIDDATA;
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}
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pal = (uint32_t *)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 = 0xFFU << 24;
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for (j = 0; j < 3; j++, shift -= 8)
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*pal += ((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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memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
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frame->palette_has_changed = 1;
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} else {
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frame->pict_type = AV_PICTURE_TYPE_P;
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frame->key_frame = 0;
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frame->palette_has_changed = 0;
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memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
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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 AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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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 = 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 += frame->linesize[0];
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}
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*got_frame = 1;
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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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av_freep(&bfi->dst);
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return 0;
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}
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const AVCodec ff_bfi_decoder = {
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.name = "bfi",
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.long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_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 = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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