LCOV - code coverage report
Current view: top level - libavcodec - lclenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 53 66 80.3 %
Date: 2017-12-16 21:16:39 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * LCL (LossLess Codec Library) Codec
       3             :  * Copyright (c) 2002-2004 Roberto Togni
       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             :  * LCL (LossLess Codec Library) Video Codec
      25             :  * Decoder for MSZH and ZLIB codecs
      26             :  * Experimental encoder for ZLIB RGB24
      27             :  *
      28             :  * Fourcc: MSZH, ZLIB
      29             :  *
      30             :  * Original Win32 dll:
      31             :  * Ver2.23 By Kenji Oshima 2000.09.20
      32             :  * avimszh.dll, avizlib.dll
      33             :  *
      34             :  * A description of the decoding algorithm can be found here:
      35             :  *   http://www.pcisys.net/~melanson/codecs
      36             :  *
      37             :  * Supports: BGR24 (RGB 24bpp)
      38             :  */
      39             : 
      40             : #include <stdio.h>
      41             : #include <stdlib.h>
      42             : 
      43             : #include "libavutil/avassert.h"
      44             : #include "avcodec.h"
      45             : #include "internal.h"
      46             : #include "lcl.h"
      47             : #include "libavutil/internal.h"
      48             : #include "libavutil/mem.h"
      49             : 
      50             : #include <zlib.h>
      51             : 
      52             : typedef struct LclEncContext {
      53             : 
      54             :     AVCodecContext *avctx;
      55             : 
      56             :     // Image type
      57             :     int imgtype;
      58             :     // Compression type
      59             :     int compression;
      60             :     // Flags
      61             :     int flags;
      62             :     z_stream zstream;
      63             : } LclEncContext;
      64             : 
      65         200 : static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
      66             :                         const AVFrame *p, int *got_packet)
      67             : {
      68         200 :     LclEncContext *c = avctx->priv_data;
      69             :     int i, ret;
      70             :     int zret; // Zlib return code
      71         200 :     int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
      72             : 
      73         200 :     if ((ret = ff_alloc_packet2(avctx, pkt, max_size, 0)) < 0)
      74           0 :         return ret;
      75             : 
      76         200 :     if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
      77           0 :         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
      78           0 :         return -1;
      79             :     }
      80             : 
      81         200 :     zret = deflateReset(&c->zstream);
      82         200 :     if (zret != Z_OK) {
      83           0 :         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
      84           0 :         return -1;
      85             :     }
      86         200 :     c->zstream.next_out  = pkt->data;
      87         200 :     c->zstream.avail_out = pkt->size;
      88             : 
      89       45100 :     for(i = avctx->height - 1; i >= 0; i--) {
      90       44900 :         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
      91       44900 :         c->zstream.avail_in = avctx->width*3;
      92       44900 :         zret = deflate(&c->zstream, Z_NO_FLUSH);
      93       44900 :         if (zret != Z_OK) {
      94           0 :             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
      95           0 :             return -1;
      96             :         }
      97             :     }
      98         200 :     zret = deflate(&c->zstream, Z_FINISH);
      99         200 :     if (zret != Z_STREAM_END) {
     100           0 :         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
     101           0 :         return -1;
     102             :     }
     103             : 
     104         200 :     pkt->size   = c->zstream.total_out;
     105         200 :     pkt->flags |= AV_PKT_FLAG_KEY;
     106         200 :     *got_packet = 1;
     107             : 
     108         200 :     return 0;
     109             : }
     110             : 
     111           4 : static av_cold int encode_init(AVCodecContext *avctx)
     112             : {
     113           4 :     LclEncContext *c = avctx->priv_data;
     114             :     int zret; // Zlib return code
     115             : 
     116           4 :     c->avctx= avctx;
     117             : 
     118           4 :     av_assert0(avctx->width && avctx->height);
     119             : 
     120           4 :     avctx->extradata = av_mallocz(8 + AV_INPUT_BUFFER_PADDING_SIZE);
     121           4 :     if (!avctx->extradata)
     122           0 :         return AVERROR(ENOMEM);
     123             : 
     124             : #if FF_API_CODED_FRAME
     125             : FF_DISABLE_DEPRECATION_WARNINGS
     126           4 :     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
     127           4 :     avctx->coded_frame->key_frame = 1;
     128             : FF_ENABLE_DEPRECATION_WARNINGS
     129             : #endif
     130             : 
     131           8 :     c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
     132           4 :                             COMP_ZLIB_NORMAL :
     133           0 :                             av_clip(avctx->compression_level, 0, 9);
     134           4 :     c->flags = 0;
     135           4 :     c->imgtype = IMGTYPE_RGB24;
     136           4 :     avctx->bits_per_coded_sample= 24;
     137             : 
     138           4 :     avctx->extradata[0]= 4;
     139           4 :     avctx->extradata[1]= 0;
     140           4 :     avctx->extradata[2]= 0;
     141           4 :     avctx->extradata[3]= 0;
     142           4 :     avctx->extradata[4]= c->imgtype;
     143           4 :     avctx->extradata[5]= c->compression;
     144           4 :     avctx->extradata[6]= c->flags;
     145           4 :     avctx->extradata[7]= CODEC_ZLIB;
     146           4 :     c->avctx->extradata_size= 8;
     147             : 
     148           4 :     c->zstream.zalloc = Z_NULL;
     149           4 :     c->zstream.zfree = Z_NULL;
     150           4 :     c->zstream.opaque = Z_NULL;
     151           4 :     zret = deflateInit(&c->zstream, c->compression);
     152           4 :     if (zret != Z_OK) {
     153           0 :         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
     154           0 :         return AVERROR_UNKNOWN;
     155             :     }
     156             : 
     157           4 :     return 0;
     158             : }
     159             : 
     160           4 : static av_cold int encode_end(AVCodecContext *avctx)
     161             : {
     162           4 :     LclEncContext *c = avctx->priv_data;
     163             : 
     164           4 :     av_freep(&avctx->extradata);
     165           4 :     deflateEnd(&c->zstream);
     166             : 
     167           4 :     return 0;
     168             : }
     169             : 
     170             : AVCodec ff_zlib_encoder = {
     171             :     .name           = "zlib",
     172             :     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
     173             :     .type           = AVMEDIA_TYPE_VIDEO,
     174             :     .id             = AV_CODEC_ID_ZLIB,
     175             :     .priv_data_size = sizeof(LclEncContext),
     176             :     .init           = encode_init,
     177             :     .encode2        = encode_frame,
     178             :     .close          = encode_end,
     179             :     .capabilities   = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
     180             :     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
     181             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
     182             :                       FF_CODEC_CAP_INIT_CLEANUP,
     183             : };

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