libavcodec/aasc.c

   1 /*
   2  * Autodesk RLE Decoder
   3  * Copyright (C) 2005 the ffmpeg project
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Autodesk RLE Video Decoder by Konstantin Shishkov
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "avcodec.h"
  32 #include "internal.h"
  33 #include "msrledec.h"
  34
  35 typedef struct AascContext {
  36     AVCodecContext *avctx;
  37     GetByteContext gb;
  38     AVFrame *frame;
  39 } AascContext;
  40
  41 static av_cold int aasc_decode_init(AVCodecContext *avctx)
  42 {
  43     AascContext *s = avctx->priv_data;
  44
  45     s->avctx = avctx;
  46
  47     avctx->pix_fmt = AV_PIX_FMT_BGR24;
  48
  49     s->frame = av_frame_alloc();
  50     if (!s->frame)
  51         return AVERROR(ENOMEM);
  52
  53     return 0;
  54 }
  55
  56 static int aasc_decode_frame(AVCodecContext *avctx,
  57                               void *data, int *got_frame,
  58                               AVPacket *avpkt)
  59 {
  60     const uint8_t *buf = avpkt->data;
  61     int buf_size       = avpkt->size;
  62     AascContext *s     = avctx->priv_data;
  63     int compr, i, stride, ret;
  64
  65     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
  66         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  67         return ret;
  68     }
  69
  70     compr     = AV_RL32(buf);
  71     buf      += 4;
  72     buf_size -= 4;
  73     switch (compr) {
  74     case 0:
  75         stride = (avctx->width * 3 + 3) & ~3;
  76         for (i = avctx->height - 1; i >= 0; i--) {
  77             memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * 3);
  78             buf += stride;
  79         }
  80         break;
  81     case 1:
  82         bytestream2_init(&s->gb, buf, buf_size);
  83         ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
  84         break;
  85     default:
  86         av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
  87         return AVERROR_INVALIDDATA;
  88     }
  89
  90     *got_frame = 1;
  91     if ((ret = av_frame_ref(data, s->frame)) < 0)
  92         return ret;
  93
  94     /* report that the buffer was completely consumed */
  95     return buf_size;
  96 }
  97
  98 static av_cold int aasc_decode_end(AVCodecContext *avctx)
  99 {
 100     AascContext *s = avctx->priv_data;
 101
 102     av_frame_free(&s->frame);
 103
 104     return 0;
 105 }
 106
 107 AVCodec ff_aasc_decoder = {
 108     .name           = "aasc",
 109     .type           = AVMEDIA_TYPE_VIDEO,
 110     .id             = AV_CODEC_ID_AASC,
 111     .priv_data_size = sizeof(AascContext),
 112     .init           = aasc_decode_init,
 113     .close          = aasc_decode_end,
 114     .decode         = aasc_decode_frame,
 115     .capabilities   = CODEC_CAP_DR1,
 116     .long_name      = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
 117 };