LCOV - code coverage report
Current view: top level - libavcodec - aasc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 36 75 48.0 %
Date: 2017-12-15 18:13:28 Functions: 3 3 100.0 %

          Line data    Source code
       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
      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             : 
      40             :     uint32_t palette[AVPALETTE_COUNT];
      41             :     int palette_size;
      42             : } AascContext;
      43             : 
      44           2 : static av_cold int aasc_decode_init(AVCodecContext *avctx)
      45             : {
      46           2 :     AascContext *s = avctx->priv_data;
      47             :     uint8_t *ptr;
      48             :     int i;
      49             : 
      50           2 :     s->avctx = avctx;
      51           2 :     switch (avctx->bits_per_coded_sample) {
      52           0 :     case 8:
      53           0 :         avctx->pix_fmt = AV_PIX_FMT_PAL8;
      54             : 
      55           0 :         ptr = avctx->extradata;
      56           0 :         s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
      57           0 :         for (i = 0; i < s->palette_size / 4; i++) {
      58           0 :             s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
      59           0 :             ptr += 4;
      60             :         }
      61           0 :         break;
      62           0 :     case 16:
      63           0 :         avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
      64           0 :         break;
      65           2 :     case 24:
      66           2 :         avctx->pix_fmt = AV_PIX_FMT_BGR24;
      67           2 :         break;
      68           0 :     default:
      69           0 :         av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
      70           0 :         return -1;
      71             :     }
      72             : 
      73           2 :     s->frame = av_frame_alloc();
      74           2 :     if (!s->frame)
      75           0 :         return AVERROR(ENOMEM);
      76             : 
      77           2 :     return 0;
      78             : }
      79             : 
      80          24 : static int aasc_decode_frame(AVCodecContext *avctx,
      81             :                               void *data, int *got_frame,
      82             :                               AVPacket *avpkt)
      83             : {
      84          24 :     const uint8_t *buf = avpkt->data;
      85          24 :     int buf_size       = avpkt->size;
      86          24 :     AascContext *s     = avctx->priv_data;
      87             :     int compr, i, stride, psize, ret;
      88             : 
      89          24 :     if (buf_size < 4) {
      90           0 :         av_log(avctx, AV_LOG_ERROR, "frame too short\n");
      91           0 :         return AVERROR_INVALIDDATA;
      92             :     }
      93             : 
      94          24 :     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
      95           0 :         return ret;
      96             : 
      97          24 :     compr     = AV_RL32(buf);
      98          24 :     buf      += 4;
      99          24 :     buf_size -= 4;
     100          24 :     psize = avctx->bits_per_coded_sample / 8;
     101          24 :     switch (avctx->codec_tag) {
     102           0 :     case MKTAG('A', 'A', 'S', '4'):
     103           0 :         bytestream2_init(&s->gb, buf - 4, buf_size + 4);
     104           0 :         ff_msrle_decode(avctx, s->frame, 8, &s->gb);
     105           0 :         break;
     106          24 :     case MKTAG('A', 'A', 'S', 'C'):
     107          24 :     switch (compr) {
     108           0 :     case 0:
     109           0 :         stride = (avctx->width * psize + psize) & ~psize;
     110           0 :         if (buf_size < stride * avctx->height)
     111           0 :             return AVERROR_INVALIDDATA;
     112           0 :         for (i = avctx->height - 1; i >= 0; i--) {
     113           0 :             memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
     114           0 :             buf += stride;
     115           0 :             buf_size -= stride;
     116             :         }
     117           0 :         break;
     118          24 :     case 1:
     119          24 :         bytestream2_init(&s->gb, buf, buf_size);
     120          24 :         ff_msrle_decode(avctx, s->frame, 8, &s->gb);
     121          24 :         break;
     122           0 :     default:
     123           0 :         av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
     124           0 :         return AVERROR_INVALIDDATA;
     125             :     }
     126          24 :         break;
     127           0 :     default:
     128           0 :         av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
     129           0 :         return -1;
     130             :     }
     131             : 
     132          24 :     if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
     133           0 :         memcpy(s->frame->data[1], s->palette, s->palette_size);
     134             : 
     135          24 :     *got_frame = 1;
     136          24 :     if ((ret = av_frame_ref(data, s->frame)) < 0)
     137           0 :         return ret;
     138             : 
     139             :     /* report that the buffer was completely consumed */
     140          24 :     return avpkt->size;
     141             : }
     142             : 
     143           2 : static av_cold int aasc_decode_end(AVCodecContext *avctx)
     144             : {
     145           2 :     AascContext *s = avctx->priv_data;
     146             : 
     147           2 :     av_frame_free(&s->frame);
     148             : 
     149           2 :     return 0;
     150             : }
     151             : 
     152             : AVCodec ff_aasc_decoder = {
     153             :     .name           = "aasc",
     154             :     .long_name      = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
     155             :     .type           = AVMEDIA_TYPE_VIDEO,
     156             :     .id             = AV_CODEC_ID_AASC,
     157             :     .priv_data_size = sizeof(AascContext),
     158             :     .init           = aasc_decode_init,
     159             :     .close          = aasc_decode_end,
     160             :     .decode         = aasc_decode_frame,
     161             :     .capabilities   = AV_CODEC_CAP_DR1,
     162             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     163             : };

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