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ffmpeg / libavcodec / sunrast.c @ 29e35482

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/*
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 * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
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 * Copyright (c) 2007, 2008 Ivo van Poorten
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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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#include "avcodec.h"
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#define RT_OLD          0
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#define RT_STANDARD     1
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#define RT_BYTE_ENCODED 2
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#define RT_FORMAT_RGB   3
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#define RT_FORMAT_TIFF  4
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#define RT_FORMAT_IFF   5
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typedef struct SUNRASTContext {
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    AVFrame picture;
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} SUNRASTContext;
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static int sunrast_init(AVCodecContext *avctx) {
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    SUNRASTContext *s = avctx->priv_data;
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    avcodec_get_frame_defaults(&s->picture);
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    avctx->coded_frame= &s->picture;
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    return 0;
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}
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static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
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                                int *data_size, uint8_t *buf, int buf_size) {
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    SUNRASTContext * const s = avctx->priv_data;
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    AVFrame *picture = data;
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    AVFrame * const p = &s->picture;
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    unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
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    uint8_t *ptr, *bufstart = buf;
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    if (AV_RB32(buf) != 0x59a66a95) {
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        av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
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        return -1;
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    }
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    w         = AV_RB32(buf+4);
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    h         = AV_RB32(buf+8);
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    depth     = AV_RB32(buf+12);
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    type      = AV_RB32(buf+20);
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    maptype   = AV_RB32(buf+24);
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    maplength = AV_RB32(buf+28);
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    if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
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        av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
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        return -1;
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    }
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    if (type > RT_FORMAT_IFF) {
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        av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
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        return -1;
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    }
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    if (maptype & ~1) {
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        av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
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        return -1;
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    }
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    buf += 32;
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    switch (depth) {
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        case 1:
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            avctx->pix_fmt = PIX_FMT_MONOWHITE;
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            break;
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        case 8:
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            avctx->pix_fmt = PIX_FMT_PAL8;
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            break;
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        case 24:
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            avctx->pix_fmt = PIX_FMT_BGR24;
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            break;
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        default:
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            av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
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            return -1;
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    }
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    if (p->data[0])
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        avctx->release_buffer(avctx, p);
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    if (avcodec_check_dimensions(avctx, w, h))
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        return -1;
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    if (w != avctx->width || h != avctx->height)
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        avcodec_set_dimensions(avctx, w, h);
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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 = FF_I_TYPE;
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    if (depth != 8 && maplength) {
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        av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
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    } else if (depth == 8) {
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        unsigned int len = maplength / 3;
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        if (!maplength) {
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            av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
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            return -1;
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        }
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        if (maplength % 3 || maplength > 768) {
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            av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
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            return -1;
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        }
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        ptr = p->data[1];
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        for (x=0; x<len; x++, ptr+=4)
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            *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
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    }
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    buf += maplength;
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    ptr    = p->data[0];
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    stride = p->linesize[0];
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    /* scanlines are aligned on 16 bit boundaries */
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    len  = (depth * w + 7) >> 3;
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    alen = len + (len&1);
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    if (type == RT_BYTE_ENCODED) {
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        int value, run;
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        uint8_t *end = ptr + h*stride;
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        x = 0;
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        while (ptr != end) {
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            run = 1;
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            if ((value = *buf++) == 0x80) {
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                run = *buf++ + 1;
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                if (run != 1)
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                    value = *buf++;
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            }
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            while (run--) {
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                if (x < len)
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                    ptr[x] = value;
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                if (++x >= alen) {
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                    x = 0;
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                    ptr += stride;
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                    if (ptr == end)
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                        break;
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                }
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            }
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        }
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    } else {
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        for (y=0; y<h; y++) {
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            memcpy(ptr, buf, len);
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            ptr += stride;
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            buf += alen;
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        }
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    }
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    *picture = s->picture;
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    *data_size = sizeof(AVFrame);
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    return buf - bufstart;
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}
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static int sunrast_end(AVCodecContext *avctx) {
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    SUNRASTContext *s = avctx->priv_data;
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    if(s->picture.data[0])
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        avctx->release_buffer(avctx, &s->picture);
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    return 0;
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}
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AVCodec sunrast_decoder = {
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    "sunrast",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_SUNRAST,
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    sizeof(SUNRASTContext),
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    sunrast_init,
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    NULL,
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    sunrast_end,
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    sunrast_decode_frame,
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    0,
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    NULL
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};