libavcodec/aasc.c

   1 /*
   2  * Autodesk RLE Decoder
   3  * Copyright (C) 2005 the ffmpeg project
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 libavcodec/aasc.c
  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 "dsputil.h"
  33 #include "msrledec.h"
  34
  35 typedef struct AascContext {
  36     AVCodecContext *avctx;
  37     AVFrame frame;
  38 } AascContext;
  39
  40 #define FETCH_NEXT_STREAM_BYTE() \
  41     if (stream_ptr >= buf_size) \
  42     { \
  43       av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (fetch)\n"); \
  44       break; \
  45     } \
  46     stream_byte = buf[stream_ptr++];
  47
  48 static av_cold int aasc_decode_init(AVCodecContext *avctx)
  49 {
  50     AascContext *s = avctx->priv_data;
  51
  52     s->avctx = avctx;
  53
  54     avctx->pix_fmt = PIX_FMT_BGR24;
  55     s->frame.data[0] = NULL;
  56
  57     return 0;
  58 }
  59
  60 static int aasc_decode_frame(AVCodecContext *avctx,
  61                               void *data, int *data_size,
  62                               AVPacket *avpkt)
  63 {
  64     const uint8_t *buf = avpkt->data;
  65     int buf_size = avpkt->size;
  66     AascContext *s = avctx->priv_data;
  67     int compr, i, stride;
  68
  69     s->frame.reference = 1;
  70     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
  71     if (avctx->reget_buffer(avctx, &s->frame)) {
  72         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  73         return -1;
  74     }
  75
  76     compr = AV_RL32(buf);
  77     buf += 4;
  78     buf_size -= 4;
  79     switch(compr){
  80     case 0:
  81         stride = (avctx->width * 3 + 3) & ~3;
  82         for(i = avctx->height - 1; i >= 0; i--){
  83             memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3);
  84             buf += stride;
  85         }
  86         break;
  87     case 1:
  88         ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4);
  89         break;
  90     default:
  91         av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
  92         return -1;
  93     }
  94
  95     *data_size = sizeof(AVFrame);
  96     *(AVFrame*)data = s->frame;
  97
  98     /* report that the buffer was completely consumed */
  99     return buf_size;
 100 }
 101
 102 static av_cold int aasc_decode_end(AVCodecContext *avctx)
 103 {
 104     AascContext *s = avctx->priv_data;
 105
 106     /* release the last frame */
 107     if (s->frame.data[0])
 108         avctx->release_buffer(avctx, &s->frame);
 109
 110     return 0;
 111 }
 112
 113 AVCodec aasc_decoder = {
 114     "aasc",
 115     CODEC_TYPE_VIDEO,
 116     CODEC_ID_AASC,
 117     sizeof(AascContext),
 118     aasc_decode_init,
 119     NULL,
 120     aasc_decode_end,
 121     aasc_decode_frame,
 122     CODEC_CAP_DR1,
 123     .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
 124 };