mirror of https://git.ffmpeg.org/ffmpeg.git
156 lines
3.9 KiB
C
156 lines
3.9 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 qdrw.c
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* Apple QuickDraw codec.
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*/
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#include "avcodec.h"
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#include "mpegvideo.h"
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typedef struct QdrawContext{
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AVCodecContext *avctx;
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AVFrame pic;
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} QdrawContext;
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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const uint8_t *buf, int buf_size)
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{
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QdrawContext * const a = avctx->priv_data;
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AVFrame * const p= (AVFrame*)&a->pic;
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uint8_t* outdata;
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int colors;
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int i;
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uint32_t *pal;
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int r, g, b;
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference= 0;
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if(avctx->get_buffer(avctx, p) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type= I_TYPE;
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p->key_frame= 1;
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outdata = a->pic.data[0];
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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 -1;
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}
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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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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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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 + a->pic.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 + a->pic.linesize[0]))
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break;
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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 += a->pic.linesize[0];
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = a->pic;
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return buf_size;
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}
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static int decode_init(AVCodecContext *avctx){
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// QdrawContext * const a = avctx->priv_data;
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if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
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return 1;
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}
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avctx->pix_fmt= PIX_FMT_PAL8;
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return 0;
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}
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AVCodec qdraw_decoder = {
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"qdraw",
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CODEC_TYPE_VIDEO,
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CODEC_ID_QDRAW,
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sizeof(QdrawContext),
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decode_init,
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NULL,
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NULL,
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decode_frame,
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CODEC_CAP_DR1,
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};
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