LCOV - code coverage report
Current view: top level - src/libavcodec - bethsoftvideo.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 54 67 80.6 %
Date: 2017-04-28 19:02:26 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Bethesda VID video decoder
       3             :  * Copyright (C) 2007 Nicholas Tung
       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             :  * @brief Bethesda Softworks VID Video Decoder
      25             :  * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
      26             :  * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
      27             :  * @see http://www.svatopluk.com/andux/docs/dfvid.html
      28             :  */
      29             : 
      30             : #include "libavutil/common.h"
      31             : #include "avcodec.h"
      32             : #include "bethsoftvideo.h"
      33             : #include "bytestream.h"
      34             : #include "internal.h"
      35             : 
      36             : typedef struct BethsoftvidContext {
      37             :     AVFrame *frame;
      38             :     GetByteContext g;
      39             : } BethsoftvidContext;
      40             : 
      41           2 : static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
      42             : {
      43           2 :     BethsoftvidContext *vid = avctx->priv_data;
      44           2 :     avctx->pix_fmt = AV_PIX_FMT_PAL8;
      45             : 
      46           2 :     vid->frame = av_frame_alloc();
      47           2 :     if (!vid->frame)
      48           0 :         return AVERROR(ENOMEM);
      49             : 
      50           2 :     return 0;
      51             : }
      52             : 
      53           1 : static int set_palette(BethsoftvidContext *ctx)
      54             : {
      55           1 :     uint32_t *palette = (uint32_t *)ctx->frame->data[1];
      56             :     int a;
      57             : 
      58           1 :     if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
      59           0 :         return AVERROR_INVALIDDATA;
      60             : 
      61         257 :     for(a = 0; a < 256; a++){
      62         256 :         palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4;
      63         256 :         palette[a] |= palette[a] >> 6 & 0x30303;
      64             :     }
      65           1 :     ctx->frame->palette_has_changed = 1;
      66           1 :     return 0;
      67             : }
      68             : 
      69          76 : static int bethsoftvid_decode_frame(AVCodecContext *avctx,
      70             :                               void *data, int *got_frame,
      71             :                               AVPacket *avpkt)
      72             : {
      73          76 :     BethsoftvidContext * vid = avctx->priv_data;
      74             :     char block_type;
      75             :     uint8_t * dst;
      76             :     uint8_t * frame_end;
      77          76 :     int remaining = avctx->width;          // number of bytes remaining on a line
      78             :     int wrap_to_next_line;
      79             :     int code, ret;
      80             :     int yoffset;
      81             : 
      82          76 :     if ((ret = ff_reget_buffer(avctx, vid->frame)) < 0)
      83           0 :         return ret;
      84          76 :     wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
      85             : 
      86          77 :     if (avpkt->side_data_elems > 0 &&
      87           1 :         avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
      88           1 :         bytestream2_init(&vid->g, avpkt->side_data[0].data,
      89           1 :                          avpkt->side_data[0].size);
      90           1 :         if ((ret = set_palette(vid)) < 0)
      91           0 :             return ret;
      92             :     }
      93             : 
      94          76 :     bytestream2_init(&vid->g, avpkt->data, avpkt->size);
      95          76 :     dst = vid->frame->data[0];
      96          76 :     frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
      97             : 
      98          76 :     switch(block_type = bytestream2_get_byte(&vid->g)){
      99             :         case PALETTE_BLOCK: {
     100           0 :             *got_frame = 0;
     101           0 :             if ((ret = set_palette(vid)) < 0) {
     102           0 :                 av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
     103           0 :                 return ret;
     104             :             }
     105           0 :             return bytestream2_tell(&vid->g);
     106             :         }
     107             :         case VIDEO_YOFF_P_FRAME:
     108          75 :             yoffset = bytestream2_get_le16(&vid->g);
     109          75 :             if(yoffset >= avctx->height)
     110           0 :                 return AVERROR_INVALIDDATA;
     111          75 :             dst += vid->frame->linesize[0] * yoffset;
     112             :     }
     113             : 
     114             :     // main code
     115      231409 :     while((code = bytestream2_get_byte(&vid->g))){
     116      231257 :         int length = code & 0x7f;
     117             : 
     118             :         // copy any bytes starting at the current position, and ending at the frame width
     119      475425 :         while(length > remaining){
     120       12911 :             if(code < 0x80)
     121           0 :                 bytestream2_get_buffer(&vid->g, dst, remaining);
     122       12911 :             else if(block_type == VIDEO_I_FRAME)
     123         199 :                 memset(dst, bytestream2_peek_byte(&vid->g), remaining);
     124       12911 :             length -= remaining;      // decrement the number of bytes to be copied
     125       12911 :             dst += remaining + wrap_to_next_line;    // skip over extra bytes at end of frame
     126       12911 :             remaining = avctx->width;
     127       12911 :             if(dst == frame_end)
     128           0 :                 goto end;
     129             :         }
     130             : 
     131             :         // copy any remaining bytes after / if line overflows
     132      231257 :         if(code < 0x80)
     133      112219 :             bytestream2_get_buffer(&vid->g, dst, length);
     134      119038 :         else if(block_type == VIDEO_I_FRAME)
     135         504 :             memset(dst, bytestream2_get_byte(&vid->g), length);
     136      231257 :         remaining -= length;
     137      231257 :         dst += length;
     138             :     }
     139             :     end:
     140             : 
     141          76 :     if ((ret = av_frame_ref(data, vid->frame)) < 0)
     142           0 :         return ret;
     143             : 
     144          76 :     *got_frame = 1;
     145             : 
     146          76 :     return avpkt->size;
     147             : }
     148             : 
     149           2 : static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
     150             : {
     151           2 :     BethsoftvidContext * vid = avctx->priv_data;
     152           2 :     av_frame_free(&vid->frame);
     153           2 :     return 0;
     154             : }
     155             : 
     156             : AVCodec ff_bethsoftvid_decoder = {
     157             :     .name           = "bethsoftvid",
     158             :     .long_name      = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
     159             :     .type           = AVMEDIA_TYPE_VIDEO,
     160             :     .id             = AV_CODEC_ID_BETHSOFTVID,
     161             :     .priv_data_size = sizeof(BethsoftvidContext),
     162             :     .init           = bethsoftvid_decode_init,
     163             :     .close          = bethsoftvid_decode_end,
     164             :     .decode         = bethsoftvid_decode_frame,
     165             :     .capabilities   = AV_CODEC_CAP_DR1,
     166             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     167             : };

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