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libavcodec/qdrw.c

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00001 /*
00002  * QuickDraw (qdrw) codec
00003  * Copyright (c) 2004 Konstantin Shishkov
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "libavutil/intreadwrite.h"
00028 #include "avcodec.h"
00029 
00030 typedef struct QdrawContext{
00031     AVCodecContext *avctx;
00032     AVFrame pic;
00033 } QdrawContext;
00034 
00035 static int decode_frame(AVCodecContext *avctx,
00036                         void *data, int *data_size,
00037                         const uint8_t *buf, int buf_size)
00038 {
00039     QdrawContext * const a = avctx->priv_data;
00040     AVFrame * const p= (AVFrame*)&a->pic;
00041     uint8_t* outdata;
00042     int colors;
00043     int i;
00044     uint32_t *pal;
00045     int r, g, b;
00046 
00047     if(p->data[0])
00048         avctx->release_buffer(avctx, p);
00049 
00050     p->reference= 0;
00051     if(avctx->get_buffer(avctx, p) < 0){
00052         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00053         return -1;
00054     }
00055     p->pict_type= FF_I_TYPE;
00056     p->key_frame= 1;
00057 
00058     outdata = a->pic.data[0];
00059 
00060     buf += 0x68; /* jump to palette */
00061     colors = AV_RB32(buf);
00062     buf += 4;
00063 
00064     if(colors < 0 || colors > 256) {
00065         av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
00066         return -1;
00067     }
00068 
00069     pal = (uint32_t*)p->data[1];
00070     for (i = 0; i <= colors; i++) {
00071         unsigned int idx;
00072         idx = AV_RB16(buf); /* color index */
00073         buf += 2;
00074 
00075         if (idx > 255) {
00076             av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
00077             buf += 6;
00078             continue;
00079         }
00080         r = *buf++;
00081         buf++;
00082         g = *buf++;
00083         buf++;
00084         b = *buf++;
00085         buf++;
00086         pal[idx] = (r << 16) | (g << 8) | b;
00087     }
00088     p->palette_has_changed = 1;
00089 
00090     buf += 18; /* skip unneeded data */
00091     for (i = 0; i < avctx->height; i++) {
00092         int size, left, code, pix;
00093         const uint8_t *next;
00094         uint8_t *out;
00095         int tsize = 0;
00096 
00097         /* decode line */
00098         out = outdata;
00099         size = AV_RB16(buf); /* size of packed line */
00100         buf += 2;
00101         left = size;
00102         next = buf + size;
00103         while (left > 0) {
00104             code = *buf++;
00105             if (code & 0x80 ) { /* run */
00106                 pix = *buf++;
00107                 if ((out + (257 - code)) > (outdata +  a->pic.linesize[0]))
00108                     break;
00109                 memset(out, pix, 257 - code);
00110                 out += 257 - code;
00111                 tsize += 257 - code;
00112                 left -= 2;
00113             } else { /* copy */
00114                 if ((out + code) > (outdata +  a->pic.linesize[0]))
00115                     break;
00116                 memcpy(out, buf, code + 1);
00117                 out += code + 1;
00118                 buf += code + 1;
00119                 left -= 2 + code;
00120                 tsize += code + 1;
00121             }
00122         }
00123         buf = next;
00124         outdata += a->pic.linesize[0];
00125     }
00126 
00127     *data_size = sizeof(AVFrame);
00128     *(AVFrame*)data = a->pic;
00129 
00130     return buf_size;
00131 }
00132 
00133 static av_cold int decode_init(AVCodecContext *avctx){
00134 //    QdrawContext * const a = avctx->priv_data;
00135 
00136     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
00137         return 1;
00138     }
00139 
00140     avctx->pix_fmt= PIX_FMT_PAL8;
00141 
00142     return 0;
00143 }
00144 
00145 AVCodec qdraw_decoder = {
00146     "qdraw",
00147     CODEC_TYPE_VIDEO,
00148     CODEC_ID_QDRAW,
00149     sizeof(QdrawContext),
00150     decode_init,
00151     NULL,
00152     NULL,
00153     decode_frame,
00154     CODEC_CAP_DR1,
00155     .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
00156 };

Generated on Tue Nov 4 2014 12:59:22 for ffmpeg by  doxygen 1.7.1