mirror of https://git.ffmpeg.org/ffmpeg.git
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*
|
|
* Microsoft Paint (MSP) version 2 decoder
|
|
* Copyright (c) 2020 Peter Ross (pross@xvid.org)
|
|
*
|
|
* 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
|
|
* Microsoft Paint (MSP) version 2 decoder
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
|
|
static int msp2_decode_frame(AVCodecContext *avctx, AVFrame *p,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int ret;
|
|
unsigned int x, y, width = (avctx->width + 7) / 8;
|
|
GetByteContext idx, gb;
|
|
|
|
if (buf_size <= 2 * avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
|
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
p->flags |= AV_FRAME_FLAG_KEY;
|
|
|
|
bytestream2_init(&idx, buf, 2 * avctx->height);
|
|
buf += 2 * avctx->height;
|
|
buf_size -= 2 * avctx->height;
|
|
|
|
for (y = 0; y < avctx->height; y++) {
|
|
unsigned int pkt_size = bytestream2_get_le16(&idx);
|
|
if (!pkt_size) {
|
|
memset(p->data[0] + y * p->linesize[0], 0xFF, width);
|
|
continue;
|
|
}
|
|
|
|
if (pkt_size > buf_size) {
|
|
av_log(avctx, AV_LOG_WARNING, "image probably corrupt\n");
|
|
pkt_size = buf_size;
|
|
}
|
|
|
|
bytestream2_init(&gb, buf, pkt_size);
|
|
x = 0;
|
|
while (bytestream2_get_bytes_left(&gb) && x < width) {
|
|
int size = bytestream2_get_byte(&gb);
|
|
if (size) {
|
|
size = FFMIN(size, bytestream2_get_bytes_left(&gb));
|
|
memcpy(p->data[0] + y * p->linesize[0] + x, gb.buffer, FFMIN(size, width - x));
|
|
bytestream2_skip(&gb, size);
|
|
} else {
|
|
int value;
|
|
size = bytestream2_get_byte(&gb);
|
|
if (!size)
|
|
avpriv_request_sample(avctx, "escape value");
|
|
value = bytestream2_get_byte(&gb);
|
|
memset(p->data[0] + y * p->linesize[0] + x, value, FFMIN(size, width - x));
|
|
}
|
|
x += size;
|
|
}
|
|
|
|
buf += pkt_size;
|
|
buf_size -= pkt_size;
|
|
}
|
|
|
|
*got_frame = 1;
|
|
return buf_size;
|
|
}
|
|
|
|
const FFCodec ff_msp2_decoder = {
|
|
.p.name = "msp2",
|
|
CODEC_LONG_NAME("Microsoft Paint (MSP) version 2"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_MSP2,
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
FF_CODEC_DECODE_CB(msp2_decode_frame),
|
|
};
|