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libavcodec/sunrast.c

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00001 /*
00002  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
00003  * Copyright (c) 2007, 2008 Ivo van Poorten
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 
00022 #include "libavutil/intreadwrite.h"
00023 #include "libavutil/imgutils.h"
00024 #include "avcodec.h"
00025 
00026 #define RT_OLD          0
00027 #define RT_STANDARD     1
00028 #define RT_BYTE_ENCODED 2
00029 #define RT_FORMAT_RGB   3
00030 #define RT_FORMAT_TIFF  4
00031 #define RT_FORMAT_IFF   5
00032 
00033 typedef struct SUNRASTContext {
00034     AVFrame picture;
00035 } SUNRASTContext;
00036 
00037 static av_cold int sunrast_init(AVCodecContext *avctx) {
00038     SUNRASTContext *s = avctx->priv_data;
00039 
00040     avcodec_get_frame_defaults(&s->picture);
00041     avctx->coded_frame= &s->picture;
00042 
00043     return 0;
00044 }
00045 
00046 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
00047                                 int *data_size, AVPacket *avpkt) {
00048     const uint8_t *buf = avpkt->data;
00049     const uint8_t *buf_end = avpkt->data + avpkt->size;
00050     SUNRASTContext * const s = avctx->priv_data;
00051     AVFrame *picture = data;
00052     AVFrame * const p = &s->picture;
00053     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
00054     uint8_t *ptr, *ptr2 = NULL;
00055     const uint8_t *bufstart = buf;
00056 
00057     if (avpkt->size < 32)
00058         return AVERROR_INVALIDDATA;
00059 
00060     if (AV_RB32(buf) != 0x59a66a95) {
00061         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
00062         return -1;
00063     }
00064 
00065     w         = AV_RB32(buf+4);
00066     h         = AV_RB32(buf+8);
00067     depth     = AV_RB32(buf+12);
00068     type      = AV_RB32(buf+20);
00069     maptype   = AV_RB32(buf+24);
00070     maplength = AV_RB32(buf+28);
00071     buf      += 32;
00072 
00073     if (type > RT_FORMAT_IFF) {
00074         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
00075         return -1;
00076     }
00077     if (av_image_check_size(w, h, 0, avctx)) {
00078         av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
00079         return -1;
00080     }
00081     if (maptype & ~1) {
00082         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
00083         return -1;
00084     }
00085 
00086     if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
00087         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
00088         return -1;
00089     }
00090 
00091     switch (depth) {
00092         case 1:
00093             avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_MONOWHITE;
00094             break;
00095         case 4:
00096             avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_NONE;
00097             break;
00098         case 8:
00099             avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_GRAY8;
00100             break;
00101         case 24:
00102             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
00103             break;
00104         case 32:
00105             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB0 : PIX_FMT_BGR0;
00106             break;
00107         default:
00108             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
00109             return -1;
00110     }
00111 
00112     if (p->data[0])
00113         avctx->release_buffer(avctx, p);
00114 
00115     if (w != avctx->width || h != avctx->height)
00116         avcodec_set_dimensions(avctx, w, h);
00117     if (avctx->get_buffer(avctx, p) < 0) {
00118         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00119         return -1;
00120     }
00121 
00122     p->pict_type = AV_PICTURE_TYPE_I;
00123 
00124     if (buf_end - buf < maplength)
00125         return AVERROR_INVALIDDATA;
00126 
00127     if (depth > 8 && maplength) {
00128         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
00129 
00130     } else if (maplength) {
00131         unsigned int len = maplength / 3;
00132 
00133         if (!maplength) {
00134             av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
00135             return -1;
00136         }
00137         if (maplength % 3 || maplength > 768) {
00138             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
00139             return -1;
00140         }
00141 
00142         ptr = p->data[1];
00143         for (x=0; x<len; x++, ptr+=4)
00144             *(uint32_t *)ptr = (0xFF<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
00145     }
00146 
00147     buf += maplength;
00148 
00149     if (maplength && depth < 8) {
00150         ptr = ptr2 = av_malloc((w + 15) * h);
00151         if (!ptr)
00152             return AVERROR(ENOMEM);
00153         stride = (w + 15 >> 3) * depth;
00154     } else {
00155     ptr    = p->data[0];
00156     stride = p->linesize[0];
00157     }
00158 
00159     /* scanlines are aligned on 16 bit boundaries */
00160     len  = (depth * w + 7) >> 3;
00161     alen = len + (len&1);
00162 
00163     if (type == RT_BYTE_ENCODED) {
00164         int value, run;
00165         uint8_t *end = ptr + h*stride;
00166 
00167         x = 0;
00168         while (ptr != end && buf < buf_end) {
00169             run = 1;
00170             if (buf_end - buf < 1)
00171                 return AVERROR_INVALIDDATA;
00172 
00173             if ((value = *buf++) == 0x80) {
00174                 run = *buf++ + 1;
00175                 if (run != 1)
00176                     value = *buf++;
00177             }
00178             while (run--) {
00179                 if (x < len)
00180                     ptr[x] = value;
00181                 if (++x >= alen) {
00182                     x = 0;
00183                     ptr += stride;
00184                     if (ptr == end)
00185                         break;
00186                 }
00187             }
00188         }
00189     } else {
00190         for (y=0; y<h; y++) {
00191             if (buf_end - buf < len)
00192                 break;
00193             memcpy(ptr, buf, len);
00194             ptr += stride;
00195             buf += alen;
00196         }
00197     }
00198     if (avctx->pix_fmt == PIX_FMT_PAL8 && depth < 8) {
00199         uint8_t *ptr_free = ptr2;
00200         ptr = p->data[0];
00201         for (y=0; y<h; y++) {
00202             for (x = 0; x < (w + 7 >> 3) * depth; x++) {
00203                 if (depth == 1) {
00204                     ptr[8*x]   = ptr2[x] >> 7;
00205                     ptr[8*x+1] = ptr2[x] >> 6 & 1;
00206                     ptr[8*x+2] = ptr2[x] >> 5 & 1;
00207                     ptr[8*x+3] = ptr2[x] >> 4 & 1;
00208                     ptr[8*x+4] = ptr2[x] >> 3 & 1;
00209                     ptr[8*x+5] = ptr2[x] >> 2 & 1;
00210                     ptr[8*x+6] = ptr2[x] >> 1 & 1;
00211                     ptr[8*x+7] = ptr2[x]      & 1;
00212                 } else {
00213                     ptr[2*x]   = ptr2[x] >> 4;
00214                     ptr[2*x+1] = ptr2[x] & 0xF;
00215                 }
00216             }
00217             ptr  += p->linesize[0];
00218             ptr2 += (w + 15 >> 3) * depth;
00219         }
00220         av_freep(&ptr_free);
00221     }
00222 
00223     *picture = s->picture;
00224     *data_size = sizeof(AVFrame);
00225 
00226     return buf - bufstart;
00227 }
00228 
00229 static av_cold int sunrast_end(AVCodecContext *avctx) {
00230     SUNRASTContext *s = avctx->priv_data;
00231 
00232     if(s->picture.data[0])
00233         avctx->release_buffer(avctx, &s->picture);
00234 
00235     return 0;
00236 }
00237 
00238 AVCodec ff_sunrast_decoder = {
00239     .name           = "sunrast",
00240     .type           = AVMEDIA_TYPE_VIDEO,
00241     .id             = CODEC_ID_SUNRAST,
00242     .priv_data_size = sizeof(SUNRASTContext),
00243     .init           = sunrast_init,
00244     .close          = sunrast_end,
00245     .decode         = sunrast_decode_frame,
00246     .capabilities   = CODEC_CAP_DR1,
00247     .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
00248 };
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