yading@10: /*
yading@10:  * QuickDraw (qdrw) codec
yading@10:  * Copyright (c) 2004 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Apple QuickDraw codec.
yading@10:  */
yading@10: 
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx,
yading@10:                         void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf     = avpkt->data;
yading@10:     const uint8_t *buf_end = avpkt->data + avpkt->size;
yading@10:     int buf_size           = avpkt->size;
yading@10:     AVFrame * const p      = data;
yading@10:     uint8_t* outdata;
yading@10:     int colors;
yading@10:     int i, ret;
yading@10:     uint32_t *pal;
yading@10:     int r, g, b;
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10:     p->key_frame = 1;
yading@10: 
yading@10:     outdata = p->data[0];
yading@10: 
yading@10:     if (buf_end - buf < 0x68 + 4)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     buf   += 0x68; /* jump to palette */
yading@10:     colors = AV_RB32(buf);
yading@10:     buf   += 4;
yading@10: 
yading@10:     if (colors < 0 || colors > 256) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (buf_end - buf < (colors + 1) * 8)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     pal = (uint32_t*)p->data[1];
yading@10:     for (i = 0; i <= colors; i++) {
yading@10:         unsigned int idx;
yading@10:         idx = AV_RB16(buf); /* color index */
yading@10:         buf += 2;
yading@10: 
yading@10:         if (idx > 255) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
yading@10:             buf += 6;
yading@10:             continue;
yading@10:         }
yading@10:         r = *buf++;
yading@10:         buf++;
yading@10:         g = *buf++;
yading@10:         buf++;
yading@10:         b = *buf++;
yading@10:         buf++;
yading@10:         pal[idx] = 0xFFU << 24 | r << 16 | g << 8 | b;
yading@10:     }
yading@10:     p->palette_has_changed = 1;
yading@10: 
yading@10:     if (buf_end - buf < 18)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     buf += 18; /* skip unneeded data */
yading@10:     for (i = 0; i < avctx->height; i++) {
yading@10:         int size, left, code, pix;
yading@10:         const uint8_t *next;
yading@10:         uint8_t *out;
yading@10:         int tsize = 0;
yading@10: 
yading@10:         /* decode line */
yading@10:         out  = outdata;
yading@10:         size = AV_RB16(buf); /* size of packed line */
yading@10:         buf += 2;
yading@10:         if (buf_end - buf < size)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         left = size;
yading@10:         next = buf + size;
yading@10:         while (left > 0) {
yading@10:             code = *buf++;
yading@10:             if (code & 0x80 ) { /* run */
yading@10:                 pix = *buf++;
yading@10:                 if ((out + (257 - code)) > (outdata +  p->linesize[0]))
yading@10:                     break;
yading@10:                 memset(out, pix, 257 - code);
yading@10:                 out   += 257 - code;
yading@10:                 tsize += 257 - code;
yading@10:                 left  -= 2;
yading@10:             } else { /* copy */
yading@10:                 if ((out + code) > (outdata +  p->linesize[0]))
yading@10:                     break;
yading@10:                 if (buf_end - buf < code + 1)
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 memcpy(out, buf, code + 1);
yading@10:                 out   += code + 1;
yading@10:                 buf   += code + 1;
yading@10:                 left  -= 2 + code;
yading@10:                 tsize += code + 1;
yading@10:             }
yading@10:         }
yading@10:         buf = next;
yading@10:         outdata += p->linesize[0];
yading@10:     }
yading@10: 
yading@10:     *got_frame      = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt= AV_PIX_FMT_PAL8;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_qdraw_decoder = {
yading@10:     .name           = "qdraw",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_QDRAW,
yading@10:     .init           = decode_init,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
yading@10: };