LCOV - code coverage report
Current view: top level - libavcodec - cscd.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 59 82 72.0 %
Date: 2018-05-20 11:54:08 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * CamStudio decoder
       3             :  * Copyright (c) 2006 Reimar Doeffinger
       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             : #include <stdio.h>
      22             : #include <stdlib.h>
      23             : 
      24             : #include "avcodec.h"
      25             : #include "internal.h"
      26             : #include "libavutil/common.h"
      27             : 
      28             : #if CONFIG_ZLIB
      29             : #include <zlib.h>
      30             : #endif
      31             : #include "libavutil/lzo.h"
      32             : 
      33             : typedef struct CamStudioContext {
      34             :     AVFrame *pic;
      35             :     int linelen, height, bpp;
      36             :     unsigned int decomp_size;
      37             :     unsigned char* decomp_buf;
      38             : } CamStudioContext;
      39             : 
      40           8 : static void copy_frame_default(AVFrame *f, const uint8_t *src,
      41             :                                int linelen, int height) {
      42           8 :     int i, src_stride = FFALIGN(linelen, 4);
      43           8 :     uint8_t *dst = f->data[0];
      44           8 :     dst += (height - 1) * f->linesize[0];
      45        2408 :     for (i = height; i; i--) {
      46        2400 :         memcpy(dst, src, linelen);
      47        2400 :         src += src_stride;
      48        2400 :         dst -= f->linesize[0];
      49             :     }
      50           8 : }
      51             : 
      52         200 : static void add_frame_default(AVFrame *f, const uint8_t *src,
      53             :                               int linelen, int height) {
      54         200 :     int i, j, src_stride = FFALIGN(linelen, 4);
      55         200 :     uint8_t *dst = f->data[0];
      56         200 :     dst += (height - 1) * f->linesize[0];
      57       60200 :     for (i = height; i; i--) {
      58    72060000 :         for (j = linelen; j; j--)
      59    72000000 :             *dst++ += *src++;
      60       60000 :         src += src_stride - linelen;
      61       60000 :         dst -= f->linesize[0] + linelen;
      62             :     }
      63         200 : }
      64             : 
      65         208 : static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
      66             :                         AVPacket *avpkt) {
      67         208 :     const uint8_t *buf = avpkt->data;
      68         208 :     int buf_size = avpkt->size;
      69         208 :     CamStudioContext *c = avctx->priv_data;
      70             :     int ret;
      71             : 
      72         208 :     if (buf_size < 2) {
      73           0 :         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
      74           0 :         return AVERROR_INVALIDDATA;
      75             :     }
      76             : 
      77         208 :     if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
      78           0 :         return ret;
      79             : 
      80             :     // decompress data
      81         208 :     switch ((buf[0] >> 1) & 7) {
      82         208 :         case 0: { // lzo compression
      83         208 :             int outlen = c->decomp_size, inlen = buf_size - 2;
      84         208 :             if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen)) {
      85           0 :                 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
      86           0 :                 return AVERROR_INVALIDDATA;
      87             :             }
      88         208 :             break;
      89             :         }
      90           0 :         case 1: { // zlib compression
      91             : #if CONFIG_ZLIB
      92           0 :             unsigned long dlen = c->decomp_size;
      93           0 :             if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK) {
      94           0 :                 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
      95           0 :                 return AVERROR_INVALIDDATA;
      96             :             }
      97           0 :             break;
      98             : #else
      99             :             av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
     100             :             return AVERROR(ENOSYS);
     101             : #endif
     102             :         }
     103           0 :         default:
     104           0 :             av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
     105           0 :             return AVERROR_INVALIDDATA;
     106             :     }
     107             : 
     108             :     // flip upside down, add difference frame
     109         208 :     if (buf[0] & 1) { // keyframe
     110           8 :         c->pic->pict_type = AV_PICTURE_TYPE_I;
     111           8 :         c->pic->key_frame = 1;
     112           8 :               copy_frame_default(c->pic, c->decomp_buf,
     113             :                                  c->linelen, c->height);
     114             :     } else {
     115         200 :         c->pic->pict_type = AV_PICTURE_TYPE_P;
     116         200 :         c->pic->key_frame = 0;
     117         200 :               add_frame_default(c->pic, c->decomp_buf,
     118             :                                 c->linelen, c->height);
     119             :     }
     120             : 
     121         208 :     *got_frame = 1;
     122         208 :     if ((ret = av_frame_ref(data, c->pic)) < 0)
     123           0 :         return ret;
     124             : 
     125         208 :     return buf_size;
     126             : }
     127             : 
     128           2 : static av_cold int decode_init(AVCodecContext *avctx) {
     129           2 :     CamStudioContext *c = avctx->priv_data;
     130             :     int stride;
     131           2 :     switch (avctx->bits_per_coded_sample) {
     132           0 :         case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555LE; break;
     133           0 :         case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
     134           2 :         case 32: avctx->pix_fmt = AV_PIX_FMT_BGR0; break;
     135           0 :         default:
     136           0 :             av_log(avctx, AV_LOG_ERROR,
     137             :                    "CamStudio codec error: invalid depth %i bpp\n",
     138             :                    avctx->bits_per_coded_sample);
     139           0 :             return AVERROR_INVALIDDATA;
     140             :     }
     141           2 :     c->bpp = avctx->bits_per_coded_sample;
     142           2 :     c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
     143           2 :     c->height = avctx->height;
     144           2 :     stride = FFALIGN(c->linelen, 4);
     145           2 :     c->decomp_size = c->height * stride;
     146           2 :     c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
     147           2 :     if (!c->decomp_buf) {
     148           0 :         av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
     149           0 :         return AVERROR(ENOMEM);
     150             :     }
     151           2 :     c->pic = av_frame_alloc();
     152           2 :     if (!c->pic)
     153           0 :         return AVERROR(ENOMEM);
     154           2 :     return 0;
     155             : }
     156             : 
     157           2 : static av_cold int decode_end(AVCodecContext *avctx) {
     158           2 :     CamStudioContext *c = avctx->priv_data;
     159           2 :     av_freep(&c->decomp_buf);
     160           2 :     av_frame_free(&c->pic);
     161           2 :     return 0;
     162             : }
     163             : 
     164             : AVCodec ff_cscd_decoder = {
     165             :     .name           = "camstudio",
     166             :     .long_name      = NULL_IF_CONFIG_SMALL("CamStudio"),
     167             :     .type           = AVMEDIA_TYPE_VIDEO,
     168             :     .id             = AV_CODEC_ID_CSCD,
     169             :     .priv_data_size = sizeof(CamStudioContext),
     170             :     .init           = decode_init,
     171             :     .close          = decode_end,
     172             :     .decode         = decode_frame,
     173             :     .capabilities   = AV_CODEC_CAP_DR1,
     174             : };

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