yading@10: /*
yading@10:  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
yading@10:  * Copyright (c) 2007, 2008 Ivo van Poorten
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "sunrast.h"
yading@10: 
yading@10: static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                 int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf       = avpkt->data;
yading@10:     const uint8_t *buf_end   = avpkt->data + avpkt->size;
yading@10:     AVFrame * const p        = data;
yading@10:     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
yading@10:     uint8_t *ptr, *ptr2 = NULL;
yading@10:     const uint8_t *bufstart = buf;
yading@10:     int ret;
yading@10: 
yading@10:     if (avpkt->size < 32)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if (AV_RB32(buf) != RAS_MAGIC) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     w         = AV_RB32(buf + 4);
yading@10:     h         = AV_RB32(buf + 8);
yading@10:     depth     = AV_RB32(buf + 12);
yading@10:     type      = AV_RB32(buf + 20);
yading@10:     maptype   = AV_RB32(buf + 24);
yading@10:     maplength = AV_RB32(buf + 28);
yading@10:     buf      += 32;
yading@10: 
yading@10:     if (type == RT_EXPERIMENTAL) {
yading@10:         avpriv_request_sample(avctx, "TIFF/IFF/EXPERIMENTAL (compression) type");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10:     if (type > RT_FORMAT_IFF) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (av_image_check_size(w, h, 0, avctx)) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (maptype == RMT_RAW) {
yading@10:         avpriv_request_sample(avctx, "Unknown colormap type");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10:     if (maptype > RMT_RAW) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     switch (depth) {
yading@10:         case 1:
yading@10:             avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE;
yading@10:             break;
yading@10:         case 4:
yading@10:             avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE;
yading@10:             break;
yading@10:         case 8:
yading@10:             avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
yading@10:             break;
yading@10:         case 24:
yading@10:             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
yading@10:             break;
yading@10:         case 32:
yading@10:             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_0RGB : AV_PIX_FMT_0BGR;
yading@10:             break;
yading@10:         default:
yading@10:             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (w != avctx->width || h != avctx->height)
yading@10:         avcodec_set_dimensions(avctx, w, h);
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10: 
yading@10:     if (buf_end - buf < maplength)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if (depth > 8 && maplength) {
yading@10:         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
yading@10: 
yading@10:     } else if (maplength) {
yading@10:         unsigned int len = maplength / 3;
yading@10: 
yading@10:         if (maplength % 3 || maplength > 768) {
yading@10:             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         ptr = p->data[1];
yading@10:         for (x = 0; x < len; x++, ptr += 4)
yading@10:             *(uint32_t *)ptr = (0xFFU<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
yading@10:     }
yading@10: 
yading@10:     buf += maplength;
yading@10: 
yading@10:     if (maplength && depth < 8) {
yading@10:         ptr = ptr2 = av_malloc((w + 15) * h);
yading@10:         if (!ptr)
yading@10:             return AVERROR(ENOMEM);
yading@10:         stride = (w + 15 >> 3) * depth;
yading@10:     } else {
yading@10:     ptr    = p->data[0];
yading@10:     stride = p->linesize[0];
yading@10:     }
yading@10: 
yading@10:     /* scanlines are aligned on 16 bit boundaries */
yading@10:     len  = (depth * w + 7) >> 3;
yading@10:     alen = len + (len & 1);
yading@10: 
yading@10:     if (type == RT_BYTE_ENCODED) {
yading@10:         int value, run;
yading@10:         uint8_t *end = ptr + h * stride;
yading@10: 
yading@10:         x = 0;
yading@10:         while (ptr != end && buf < buf_end) {
yading@10:             run = 1;
yading@10:             if (buf_end - buf < 1)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             if ((value = *buf++) == RLE_TRIGGER) {
yading@10:                 run = *buf++ + 1;
yading@10:                 if (run != 1)
yading@10:                     value = *buf++;
yading@10:             }
yading@10:             while (run--) {
yading@10:                 if (x < len)
yading@10:                     ptr[x] = value;
yading@10:                 if (++x >= alen) {
yading@10:                     x = 0;
yading@10:                     ptr += stride;
yading@10:                     if (ptr == end)
yading@10:                         break;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     } else {
yading@10:         for (y = 0; y < h; y++) {
yading@10:             if (buf_end - buf < len)
yading@10:                 break;
yading@10:             memcpy(ptr, buf, len);
yading@10:             ptr += stride;
yading@10:             buf += alen;
yading@10:         }
yading@10:     }
yading@10:     if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) {
yading@10:         uint8_t *ptr_free = ptr2;
yading@10:         ptr = p->data[0];
yading@10:         for (y=0; y<h; y++) {
yading@10:             for (x = 0; x < (w + 7 >> 3) * depth; x++) {
yading@10:                 if (depth == 1) {
yading@10:                     ptr[8*x]   = ptr2[x] >> 7;
yading@10:                     ptr[8*x+1] = ptr2[x] >> 6 & 1;
yading@10:                     ptr[8*x+2] = ptr2[x] >> 5 & 1;
yading@10:                     ptr[8*x+3] = ptr2[x] >> 4 & 1;
yading@10:                     ptr[8*x+4] = ptr2[x] >> 3 & 1;
yading@10:                     ptr[8*x+5] = ptr2[x] >> 2 & 1;
yading@10:                     ptr[8*x+6] = ptr2[x] >> 1 & 1;
yading@10:                     ptr[8*x+7] = ptr2[x]      & 1;
yading@10:                 } else {
yading@10:                     ptr[2*x]   = ptr2[x] >> 4;
yading@10:                     ptr[2*x+1] = ptr2[x] & 0xF;
yading@10:                 }
yading@10:             }
yading@10:             ptr  += p->linesize[0];
yading@10:             ptr2 += (w + 15 >> 3) * depth;
yading@10:         }
yading@10:         av_freep(&ptr_free);
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf - bufstart;
yading@10: }
yading@10: 
yading@10: AVCodec ff_sunrast_decoder = {
yading@10:     .name           = "sunrast",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_SUNRAST,
yading@10:     .decode         = sunrast_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
yading@10: };