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104 lines
3.2 KiB
104 lines
3.2 KiB
/* |
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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 "internal.h" |
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static int msp2_decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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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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AVFrame *p = data; |
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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->key_frame = 1; |
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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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.p.long_name = NULL_IF_CONFIG_SMALL("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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.decode = msp2_decode_frame, |
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};
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