LCOV - code coverage report
Current view: top level - libavcodec - tscc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 49 70 70.0 %
Date: 2017-12-16 13:57:32 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * TechSmith Camtasia decoder
       3             :  * Copyright (c) 2004 Konstantin Shishkov
       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             :  * TechSmith Camtasia decoder
      25             :  *
      26             :  * Fourcc: TSCC
      27             :  *
      28             :  * Codec is very simple:
      29             :  *  it codes picture (picture difference, really)
      30             :  *  with algorithm almost identical to Windows RLE8,
      31             :  *  only without padding and with greater pixel sizes,
      32             :  *  then this coded picture is packed with ZLib
      33             :  *
      34             :  * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
      35             :  */
      36             : 
      37             : #include <stdio.h>
      38             : #include <stdlib.h>
      39             : 
      40             : #include "avcodec.h"
      41             : #include "internal.h"
      42             : #include "msrledec.h"
      43             : 
      44             : #include <zlib.h>
      45             : 
      46             : typedef struct TsccContext {
      47             : 
      48             :     AVCodecContext *avctx;
      49             :     AVFrame *frame;
      50             : 
      51             :     // Bits per pixel
      52             :     int bpp;
      53             :     // Decompressed data size
      54             :     unsigned int decomp_size;
      55             :     // Decompression buffer
      56             :     unsigned char* decomp_buf;
      57             :     GetByteContext gb;
      58             :     int height;
      59             :     z_stream zstream;
      60             : 
      61             :     uint32_t pal[256];
      62             : } CamtasiaContext;
      63             : 
      64         383 : static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
      65             :                         AVPacket *avpkt)
      66             : {
      67         383 :     const uint8_t *buf = avpkt->data;
      68         383 :     int buf_size = avpkt->size;
      69         383 :     CamtasiaContext * const c = avctx->priv_data;
      70         383 :     AVFrame *frame = c->frame;
      71             :     int ret;
      72             : 
      73         383 :     if ((ret = ff_reget_buffer(avctx, frame)) < 0)
      74           0 :         return ret;
      75             : 
      76         383 :     ret = inflateReset(&c->zstream);
      77         383 :     if (ret != Z_OK) {
      78           0 :         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
      79           0 :         return AVERROR_UNKNOWN;
      80             :     }
      81         383 :     c->zstream.next_in   = buf;
      82         383 :     c->zstream.avail_in  = buf_size;
      83         383 :     c->zstream.next_out = c->decomp_buf;
      84         383 :     c->zstream.avail_out = c->decomp_size;
      85         383 :     ret = inflate(&c->zstream, Z_FINISH);
      86             :     // Z_DATA_ERROR means empty picture
      87         383 :     if ((ret != Z_OK) && (ret != Z_STREAM_END) && (ret != Z_DATA_ERROR)) {
      88           1 :         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
      89           1 :         return AVERROR_UNKNOWN;
      90             :     }
      91             : 
      92             : 
      93         382 :     if (ret != Z_DATA_ERROR) {
      94         122 :         bytestream2_init(&c->gb, c->decomp_buf,
      95         122 :                          c->decomp_size - c->zstream.avail_out);
      96         122 :         ff_msrle_decode(avctx, frame, c->bpp, &c->gb);
      97             :     }
      98             : 
      99             :     /* make the palette available on the way out */
     100         382 :     if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
     101             :         int size;
     102           0 :         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
     103             : 
     104           0 :         if (pal && size == AVPALETTE_SIZE) {
     105           0 :             frame->palette_has_changed = 1;
     106           0 :             memcpy(c->pal, pal, AVPALETTE_SIZE);
     107           0 :         } else if (pal) {
     108           0 :             av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
     109             :         }
     110           0 :         memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
     111             :     }
     112             : 
     113         382 :     if ((ret = av_frame_ref(data, frame)) < 0)
     114           0 :         return ret;
     115         382 :     *got_frame      = 1;
     116             : 
     117             :     /* always report that the buffer was completely consumed */
     118         382 :     return buf_size;
     119             : }
     120             : 
     121           4 : static av_cold int decode_init(AVCodecContext *avctx)
     122             : {
     123           4 :     CamtasiaContext * const c = avctx->priv_data;
     124             :     int zret; // Zlib return code
     125             : 
     126           4 :     c->avctx = avctx;
     127             : 
     128           4 :     c->height = avctx->height;
     129             : 
     130             :     // Needed if zlib unused or init aborted before inflateInit
     131           4 :     memset(&c->zstream, 0, sizeof(z_stream));
     132           4 :     switch(avctx->bits_per_coded_sample){
     133           0 :     case  8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
     134           2 :     case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
     135           0 :     case 24:
     136           0 :              avctx->pix_fmt = AV_PIX_FMT_BGR24;
     137           0 :              break;
     138           2 :     case 32: avctx->pix_fmt = AV_PIX_FMT_0RGB32; break;
     139           0 :     default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
     140           0 :              return AVERROR_PATCHWELCOME;
     141             :     }
     142           4 :     c->bpp = avctx->bits_per_coded_sample;
     143             :     // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too
     144           4 :     c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
     145             : 
     146             :     /* Allocate decompression buffer */
     147           4 :     if (c->decomp_size) {
     148           4 :         if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
     149           0 :             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
     150           0 :             return AVERROR(ENOMEM);
     151             :         }
     152             :     }
     153             : 
     154           4 :     c->zstream.zalloc = Z_NULL;
     155           4 :     c->zstream.zfree = Z_NULL;
     156           4 :     c->zstream.opaque = Z_NULL;
     157           4 :     zret = inflateInit(&c->zstream);
     158           4 :     if (zret != Z_OK) {
     159           0 :         av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
     160           0 :         return AVERROR_UNKNOWN;
     161             :     }
     162             : 
     163           4 :     c->frame = av_frame_alloc();
     164             : 
     165           4 :     return 0;
     166             : }
     167             : 
     168           4 : static av_cold int decode_end(AVCodecContext *avctx)
     169             : {
     170           4 :     CamtasiaContext * const c = avctx->priv_data;
     171             : 
     172           4 :     av_freep(&c->decomp_buf);
     173           4 :     av_frame_free(&c->frame);
     174             : 
     175           4 :     inflateEnd(&c->zstream);
     176             : 
     177           4 :     return 0;
     178             : }
     179             : 
     180             : AVCodec ff_tscc_decoder = {
     181             :     .name           = "camtasia",
     182             :     .long_name      = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
     183             :     .type           = AVMEDIA_TYPE_VIDEO,
     184             :     .id             = AV_CODEC_ID_TSCC,
     185             :     .priv_data_size = sizeof(CamtasiaContext),
     186             :     .init           = decode_init,
     187             :     .close          = decode_end,
     188             :     .decode         = decode_frame,
     189             :     .capabilities   = AV_CODEC_CAP_DR1,
     190             : };

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