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/intreadwrite.h" 28#include "avcodec.h" 29 30typedef struct QdrawContext{ 31 AVCodecContext *avctx; 32 AVFrame pic; 33} QdrawContext; 34 35static int decode_frame(AVCodecContext *avctx, 36 void *data, int *data_size, 37 AVPacket *avpkt) 38{ 39 const uint8_t *buf = avpkt->data; 40 int buf_size = avpkt->size; 41 QdrawContext * const a = avctx->priv_data; 42 AVFrame * const p= (AVFrame*)&a->pic; 43 uint8_t* outdata; 44 int colors; 45 int i; 46 uint32_t *pal; 47 int r, g, b; 48 49 if(p->data[0]) 50 avctx->release_buffer(avctx, p); 51 52 p->reference= 0; 53 if(avctx->get_buffer(avctx, p) < 0){ 54 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 55 return -1; 56 } 57 p->pict_type= FF_I_TYPE; 58 p->key_frame= 1; 59 60 outdata = a->pic.data[0]; 61 62 buf += 0x68; /* jump to palette */ 63 colors = AV_RB32(buf); 64 buf += 4; 65 66 if(colors < 0 || colors > 256) { 67 av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors); 68 return -1; 69 } 70 71 pal = (uint32_t*)p->data[1]; 72 for (i = 0; i <= colors; i++) { 73 unsigned int idx; 74 idx = AV_RB16(buf); /* color index */ 75 buf += 2; 76 77 if (idx > 255) { 78 av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx); 79 buf += 6; 80 continue; 81 } 82 r = *buf++; 83 buf++; 84 g = *buf++; 85 buf++; 86 b = *buf++; 87 buf++; 88 pal[idx] = (r << 16) | (g << 8) | b; 89 } 90 p->palette_has_changed = 1; 91 92 buf += 18; /* skip unneeded data */ 93 for (i = 0; i < avctx->height; i++) { 94 int size, left, code, pix; 95 const uint8_t *next; 96 uint8_t *out; 97 int tsize = 0; 98 99 /* decode line */ 100 out = outdata; 101 size = AV_RB16(buf); /* size of packed line */ 102 buf += 2; 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 + a->pic.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 + a->pic.linesize[0])) 117 break; 118 memcpy(out, buf, code + 1); 119 out += code + 1; 120 buf += code + 1; 121 left -= 2 + code; 122 tsize += code + 1; 123 } 124 } 125 buf = next; 126 outdata += a->pic.linesize[0]; 127 } 128 129 *data_size = sizeof(AVFrame); 130 *(AVFrame*)data = a->pic; 131 132 return buf_size; 133} 134 135static av_cold int decode_init(AVCodecContext *avctx){ 136// QdrawContext * const a = avctx->priv_data; 137 138 avctx->pix_fmt= PIX_FMT_PAL8; 139 140 return 0; 141} 142 143static av_cold int decode_end(AVCodecContext *avctx){ 144 QdrawContext * const a = avctx->priv_data; 145 AVFrame *pic = &a->pic; 146 147 if (pic->data[0]) 148 avctx->release_buffer(avctx, pic); 149 150 return 0; 151} 152 153AVCodec qdraw_decoder = { 154 "qdraw", 155 AVMEDIA_TYPE_VIDEO, 156 CODEC_ID_QDRAW, 157 sizeof(QdrawContext), 158 decode_init, 159 NULL, 160 decode_end, 161 decode_frame, 162 CODEC_CAP_DR1, 163 .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"), 164}; 165