| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Microsoft Paint (MSP) version 2 decoder | ||
| 3 | * Copyright (c) 2020 Peter Ross (pross@xvid.org) | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * Microsoft Paint (MSP) version 2 decoder | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "avcodec.h" | ||
| 28 | #include "bytestream.h" | ||
| 29 | #include "codec_internal.h" | ||
| 30 | #include "decode.h" | ||
| 31 | |||
| 32 | ✗ | static int msp2_decode_frame(AVCodecContext *avctx, AVFrame *p, | |
| 33 | int *got_frame, AVPacket *avpkt) | ||
| 34 | { | ||
| 35 | ✗ | const uint8_t *buf = avpkt->data; | |
| 36 | ✗ | int buf_size = avpkt->size; | |
| 37 | int ret; | ||
| 38 | ✗ | unsigned int x, y, width = (avctx->width + 7) / 8; | |
| 39 | GetByteContext idx, gb; | ||
| 40 | |||
| 41 | ✗ | if (buf_size <= 2 * avctx->height) | |
| 42 | ✗ | return AVERROR_INVALIDDATA; | |
| 43 | |||
| 44 | ✗ | avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; | |
| 45 | |||
| 46 | ✗ | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
| 47 | ✗ | return ret; | |
| 48 | |||
| 49 | ✗ | bytestream2_init(&idx, buf, 2 * avctx->height); | |
| 50 | ✗ | buf += 2 * avctx->height; | |
| 51 | ✗ | buf_size -= 2 * avctx->height; | |
| 52 | |||
| 53 | ✗ | for (y = 0; y < avctx->height; y++) { | |
| 54 | ✗ | unsigned int pkt_size = bytestream2_get_le16(&idx); | |
| 55 | ✗ | if (!pkt_size) { | |
| 56 | ✗ | memset(p->data[0] + y * p->linesize[0], 0xFF, width); | |
| 57 | ✗ | continue; | |
| 58 | } | ||
| 59 | |||
| 60 | ✗ | if (pkt_size > buf_size) { | |
| 61 | ✗ | av_log(avctx, AV_LOG_WARNING, "image probably corrupt\n"); | |
| 62 | ✗ | pkt_size = buf_size; | |
| 63 | } | ||
| 64 | |||
| 65 | ✗ | bytestream2_init(&gb, buf, pkt_size); | |
| 66 | ✗ | x = 0; | |
| 67 | ✗ | while (bytestream2_get_bytes_left(&gb) && x < width) { | |
| 68 | ✗ | int size = bytestream2_get_byte(&gb); | |
| 69 | ✗ | if (size) { | |
| 70 | ✗ | size = FFMIN(size, bytestream2_get_bytes_left(&gb)); | |
| 71 | ✗ | memcpy(p->data[0] + y * p->linesize[0] + x, gb.buffer, FFMIN(size, width - x)); | |
| 72 | ✗ | bytestream2_skip(&gb, size); | |
| 73 | } else { | ||
| 74 | int value; | ||
| 75 | ✗ | size = bytestream2_get_byte(&gb); | |
| 76 | ✗ | if (!size) | |
| 77 | ✗ | avpriv_request_sample(avctx, "escape value"); | |
| 78 | ✗ | value = bytestream2_get_byte(&gb); | |
| 79 | ✗ | memset(p->data[0] + y * p->linesize[0] + x, value, FFMIN(size, width - x)); | |
| 80 | } | ||
| 81 | ✗ | x += size; | |
| 82 | } | ||
| 83 | |||
| 84 | ✗ | buf += pkt_size; | |
| 85 | ✗ | buf_size -= pkt_size; | |
| 86 | } | ||
| 87 | |||
| 88 | ✗ | *got_frame = 1; | |
| 89 | ✗ | return buf_size; | |
| 90 | } | ||
| 91 | |||
| 92 | const FFCodec ff_msp2_decoder = { | ||
| 93 | .p.name = "msp2", | ||
| 94 | CODEC_LONG_NAME("Microsoft Paint (MSP) version 2"), | ||
| 95 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 96 | .p.id = AV_CODEC_ID_MSP2, | ||
| 97 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 98 | FF_CODEC_DECODE_CB(msp2_decode_frame), | ||
| 99 | }; | ||
| 100 |