| 1 | /* |
| 2 | * QuickDraw (qdrw) codec |
| 3 | * Copyright (c) 2004 Konstantin Shishkov |
| 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 | * Apple QuickDraw codec. |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/common.h" |
| 28 | #include "libavutil/intreadwrite.h" |
| 29 | #include "avcodec.h" |
| 30 | #include "internal.h" |
| 31 | |
| 32 | static int decode_frame(AVCodecContext *avctx, |
| 33 | void *data, int *got_frame, |
| 34 | AVPacket *avpkt) |
| 35 | { |
| 36 | const uint8_t *buf = avpkt->data; |
| 37 | const uint8_t *buf_end = avpkt->data + avpkt->size; |
| 38 | int buf_size = avpkt->size; |
| 39 | AVFrame * const p = data; |
| 40 | uint8_t* outdata; |
| 41 | int colors; |
| 42 | int i, ret; |
| 43 | uint32_t *pal; |
| 44 | int r, g, b; |
| 45 | |
| 46 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 47 | return ret; |
| 48 | p->pict_type = AV_PICTURE_TYPE_I; |
| 49 | p->key_frame = 1; |
| 50 | |
| 51 | outdata = p->data[0]; |
| 52 | |
| 53 | if (buf_end - buf < 0x68 + 4) |
| 54 | return AVERROR_INVALIDDATA; |
| 55 | buf += 0x68; /* jump to palette */ |
| 56 | colors = AV_RB32(buf); |
| 57 | buf += 4; |
| 58 | |
| 59 | if (colors < 0 || colors > 256) { |
| 60 | av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors); |
| 61 | return AVERROR_INVALIDDATA; |
| 62 | } |
| 63 | if (buf_end - buf < (colors + 1) * 8) |
| 64 | return AVERROR_INVALIDDATA; |
| 65 | |
| 66 | pal = (uint32_t*)p->data[1]; |
| 67 | for (i = 0; i <= colors; i++) { |
| 68 | unsigned int idx; |
| 69 | idx = AV_RB16(buf); /* color index */ |
| 70 | buf += 2; |
| 71 | |
| 72 | if (idx > 255) { |
| 73 | av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx); |
| 74 | buf += 6; |
| 75 | continue; |
| 76 | } |
| 77 | r = *buf++; |
| 78 | buf++; |
| 79 | g = *buf++; |
| 80 | buf++; |
| 81 | b = *buf++; |
| 82 | buf++; |
| 83 | pal[idx] = 0xFFU << 24 | r << 16 | g << 8 | b; |
| 84 | } |
| 85 | p->palette_has_changed = 1; |
| 86 | |
| 87 | if (buf_end - buf < 18) |
| 88 | return AVERROR_INVALIDDATA; |
| 89 | buf += 18; /* skip unneeded data */ |
| 90 | for (i = 0; i < avctx->height; i++) { |
| 91 | int size, left, code, pix; |
| 92 | const uint8_t *next; |
| 93 | uint8_t *out; |
| 94 | int tsize = 0; |
| 95 | |
| 96 | /* decode line */ |
| 97 | out = outdata; |
| 98 | size = AV_RB16(buf); /* size of packed line */ |
| 99 | buf += 2; |
| 100 | if (buf_end - buf < size) |
| 101 | return AVERROR_INVALIDDATA; |
| 102 | |
| 103 | left = size; |
| 104 | next = buf + size; |
| 105 | while (left > 0) { |
| 106 | code = *buf++; |
| 107 | if (code & 0x80 ) { /* run */ |
| 108 | pix = *buf++; |
| 109 | if ((out + (257 - code)) > (outdata + p->linesize[0])) |
| 110 | break; |
| 111 | memset(out, pix, 257 - code); |
| 112 | out += 257 - code; |
| 113 | tsize += 257 - code; |
| 114 | left -= 2; |
| 115 | } else { /* copy */ |
| 116 | if ((out + code) > (outdata + p->linesize[0])) |
| 117 | break; |
| 118 | if (buf_end - buf < code + 1) |
| 119 | return AVERROR_INVALIDDATA; |
| 120 | memcpy(out, buf, code + 1); |
| 121 | out += code + 1; |
| 122 | buf += code + 1; |
| 123 | left -= 2 + code; |
| 124 | tsize += code + 1; |
| 125 | } |
| 126 | } |
| 127 | buf = next; |
| 128 | outdata += p->linesize[0]; |
| 129 | } |
| 130 | |
| 131 | *got_frame = 1; |
| 132 | |
| 133 | return buf_size; |
| 134 | } |
| 135 | |
| 136 | static av_cold int decode_init(AVCodecContext *avctx) |
| 137 | { |
| 138 | avctx->pix_fmt= AV_PIX_FMT_PAL8; |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | AVCodec ff_qdraw_decoder = { |
| 144 | .name = "qdraw", |
| 145 | .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"), |
| 146 | .type = AVMEDIA_TYPE_VIDEO, |
| 147 | .id = AV_CODEC_ID_QDRAW, |
| 148 | .init = decode_init, |
| 149 | .decode = decode_frame, |
| 150 | .capabilities = CODEC_CAP_DR1, |
| 151 | }; |