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https://github.com/FFmpeg/FFmpeg.git
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103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*
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* Microsoft Paint (MSP) version 2 decoder
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* Copyright (c) 2020 Peter Ross (pross@xvid.org)
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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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* Microsoft Paint (MSP) version 2 decoder
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "decode.h"
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static int msp2_decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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int ret;
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unsigned int x, y, width = (avctx->width + 7) / 8;
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GetByteContext idx, gb;
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if (buf_size <= 2 * avctx->height)
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return AVERROR_INVALIDDATA;
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avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->flags |= AV_FRAME_FLAG_KEY;
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bytestream2_init(&idx, buf, 2 * avctx->height);
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buf += 2 * avctx->height;
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buf_size -= 2 * avctx->height;
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for (y = 0; y < avctx->height; y++) {
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unsigned int pkt_size = bytestream2_get_le16(&idx);
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if (!pkt_size) {
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memset(p->data[0] + y * p->linesize[0], 0xFF, width);
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continue;
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}
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if (pkt_size > buf_size) {
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av_log(avctx, AV_LOG_WARNING, "image probably corrupt\n");
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pkt_size = buf_size;
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}
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bytestream2_init(&gb, buf, pkt_size);
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x = 0;
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while (bytestream2_get_bytes_left(&gb) && x < width) {
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int size = bytestream2_get_byte(&gb);
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if (size) {
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size = FFMIN(size, bytestream2_get_bytes_left(&gb));
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memcpy(p->data[0] + y * p->linesize[0] + x, gb.buffer, FFMIN(size, width - x));
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bytestream2_skip(&gb, size);
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} else {
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int value;
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size = bytestream2_get_byte(&gb);
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if (!size)
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avpriv_request_sample(avctx, "escape value");
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value = bytestream2_get_byte(&gb);
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memset(p->data[0] + y * p->linesize[0] + x, value, FFMIN(size, width - x));
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}
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x += size;
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}
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buf += pkt_size;
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buf_size -= pkt_size;
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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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const FFCodec ff_msp2_decoder = {
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.p.name = "msp2",
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CODEC_LONG_NAME("Microsoft Paint (MSP) version 2"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_MSP2,
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.p.capabilities = AV_CODEC_CAP_DR1,
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FF_CODEC_DECODE_CB(msp2_decode_frame),
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};
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