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