qdrw.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:4k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * QuickDraw (qdrw) codec
- * Copyright (c) 2004 Konstantin Shishkov
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- /**
- * @file qdrw.c
- * Apple QuickDraw codec.
- */
- #include "avcodec.h"
- #include "mpegvideo.h"
- typedef struct QdrawContext{
- AVCodecContext *avctx;
- AVFrame pic;
- uint8_t palette[256*3];
- } QdrawContext;
- static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
- {
- QdrawContext * const a = avctx->priv_data;
- AVFrame * const p= (AVFrame*)&a->pic;
- uint8_t* outdata;
- int colors;
- int i;
- if(p->data[0])
- avctx->release_buffer(avctx, p);
- p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 0){
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failedn");
- return -1;
- }
- p->pict_type= I_TYPE;
- p->key_frame= 1;
- outdata = a->pic.data[0];
- buf += 0x68; /* jump to palette */
- colors = BE_32(buf);
- buf += 4;
- if(colors < 0 || colors > 256) {
- av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)n", colors, colors);
- return -1;
- }
- for (i = 0; i <= colors; i++) {
- unsigned int idx;
- idx = BE_16(buf); /* color index */
- buf += 2;
- if (idx > 255) {
- av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %un", idx);
- buf += 6;
- continue;
- }
- a->palette[idx * 3 + 0] = *buf++;
- buf++;
- a->palette[idx * 3 + 1] = *buf++;
- buf++;
- a->palette[idx * 3 + 2] = *buf++;
- buf++;
- }
- buf += 18; /* skip unneeded data */
- for (i = 0; i < avctx->height; i++) {
- int size, left, code, pix;
- uint8_t *next;
- uint8_t *out;
- int tsize = 0;
- /* decode line */
- out = outdata;
- size = BE_16(buf); /* size of packed line */
- buf += 2;
- left = size;
- next = buf + size;
- while (left > 0) {
- code = *buf++;
- if (code & 0x80 ) { /* run */
- int i;
- pix = *buf++;
- if ((out + (257 - code) * 3) > (outdata + a->pic.linesize[0]))
- break;
- for (i = 0; i < 257 - code; i++) {
- *out++ = a->palette[pix * 3 + 0];
- *out++ = a->palette[pix * 3 + 1];
- *out++ = a->palette[pix * 3 + 2];
- }
- tsize += 257 - code;
- left -= 2;
- } else { /* copy */
- int i, pix;
- if ((out + code * 3) > (outdata + a->pic.linesize[0]))
- break;
- for (i = 0; i <= code; i++) {
- pix = *buf++;
- *out++ = a->palette[pix * 3 + 0];
- *out++ = a->palette[pix * 3 + 1];
- *out++ = a->palette[pix * 3 + 2];
- }
- left -= 2 + code;
- tsize += code + 1;
- }
- }
- buf = next;
- outdata += a->pic.linesize[0];
- }
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = a->pic;
- return buf_size;
- }
- static int decode_init(AVCodecContext *avctx){
- // QdrawContext * const a = avctx->priv_data;
- if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
- return 1;
- }
- avctx->pix_fmt= PIX_FMT_RGB24;
- return 0;
- }
- AVCodec qdraw_decoder = {
- "qdraw",
- CODEC_TYPE_VIDEO,
- CODEC_ID_QDRAW,
- sizeof(QdrawContext),
- decode_init,
- NULL,
- NULL,
- decode_frame,
- CODEC_CAP_DR1,
- };