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 32static 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 136static av_cold int decode_init(AVCodecContext *avctx) 137{ 138 avctx->pix_fmt= AV_PIX_FMT_PAL8; 139 140 return 0; 141} 142 143AVCodec 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}; 152