LCOV - code coverage report
Current view: top level - libavcodec - msrle.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 38 66 57.6 %
Date: 2017-12-16 01:21:47 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Microsoft RLE video decoder
       3             :  * Copyright (C) 2003 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             :  * MS RLE video decoder by Mike Melanson (melanson@pcisys.net)
      25             :  * For more information about the MS RLE format, visit:
      26             :  *   http://www.pcisys.net/~melanson/codecs/
      27             :  *
      28             :  * The MS RLE decoder outputs PAL8 colorspace data.
      29             :  */
      30             : 
      31             : #include <stdio.h>
      32             : #include <stdlib.h>
      33             : #include <string.h>
      34             : 
      35             : #include "avcodec.h"
      36             : #include "internal.h"
      37             : #include "msrledec.h"
      38             : #include "libavutil/imgutils.h"
      39             : 
      40             : typedef struct MsrleContext {
      41             :     AVCodecContext *avctx;
      42             :     AVFrame *frame;
      43             : 
      44             :     GetByteContext gb;
      45             :     const unsigned char *buf;
      46             :     int size;
      47             : 
      48             :     uint32_t pal[256];
      49             : } MsrleContext;
      50             : 
      51           2 : static av_cold int msrle_decode_init(AVCodecContext *avctx)
      52             : {
      53           2 :     MsrleContext *s = avctx->priv_data;
      54             :     int i;
      55             : 
      56           2 :     s->avctx = avctx;
      57             : 
      58           2 :     switch (avctx->bits_per_coded_sample) {
      59           0 :     case 1:
      60           0 :         avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
      61           0 :         break;
      62           2 :     case 4:
      63             :     case 8:
      64           2 :         avctx->pix_fmt = AV_PIX_FMT_PAL8;
      65           2 :         break;
      66           0 :     case 24:
      67           0 :         avctx->pix_fmt = AV_PIX_FMT_BGR24;
      68           0 :         break;
      69           0 :     default:
      70           0 :         av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
      71           0 :         return AVERROR_INVALIDDATA;
      72             :     }
      73             : 
      74           2 :     s->frame = av_frame_alloc();
      75           2 :     if (!s->frame)
      76           0 :         return AVERROR(ENOMEM);
      77             : 
      78           2 :     if (avctx->extradata_size >= 4)
      79          36 :         for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
      80          34 :             s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
      81             : 
      82           2 :     return 0;
      83             : }
      84             : 
      85          29 : static int msrle_decode_frame(AVCodecContext *avctx,
      86             :                               void *data, int *got_frame,
      87             :                               AVPacket *avpkt)
      88             : {
      89          29 :     const uint8_t *buf = avpkt->data;
      90          29 :     int buf_size = avpkt->size;
      91          29 :     MsrleContext *s = avctx->priv_data;
      92          29 :     int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
      93             :     int ret;
      94             : 
      95          29 :     s->buf = buf;
      96          29 :     s->size = buf_size;
      97             : 
      98          29 :     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
      99           0 :         return ret;
     100             : 
     101          29 :     if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
     102             :         int size;
     103          29 :         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
     104             : 
     105          29 :         if (pal && size == AVPALETTE_SIZE) {
     106           1 :             s->frame->palette_has_changed = 1;
     107           1 :             memcpy(s->pal, pal, AVPALETTE_SIZE);
     108          28 :         } else if (pal) {
     109           0 :             av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
     110             :         }
     111             :         /* make the palette available */
     112          29 :         memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
     113             :     }
     114             : 
     115             :     /* FIXME how to correctly detect RLE ??? */
     116          29 :     if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
     117           0 :         int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0);
     118           0 :         uint8_t *ptr = s->frame->data[0];
     119           0 :         uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
     120             :         int i, j;
     121             : 
     122           0 :         if (linesize < 0)
     123           0 :             return linesize;
     124             : 
     125           0 :         for (i = 0; i < avctx->height; i++) {
     126           0 :             if (avctx->bits_per_coded_sample == 4) {
     127           0 :                 for (j = 0; j < avctx->width - 1; j += 2) {
     128           0 :                     ptr[j+0] = buf[j>>1] >> 4;
     129           0 :                     ptr[j+1] = buf[j>>1] & 0xF;
     130             :                 }
     131           0 :                 if (avctx->width & 1)
     132           0 :                     ptr[j+0] = buf[j>>1] >> 4;
     133             :             } else {
     134           0 :                 memcpy(ptr, buf, linesize);
     135             :             }
     136           0 :             buf -= istride;
     137           0 :             ptr += s->frame->linesize[0];
     138             :         }
     139             :     } else {
     140          29 :         bytestream2_init(&s->gb, buf, buf_size);
     141          29 :         ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb);
     142             :     }
     143             : 
     144          29 :     if ((ret = av_frame_ref(data, s->frame)) < 0)
     145           0 :         return ret;
     146             : 
     147          29 :     *got_frame      = 1;
     148             : 
     149             :     /* report that the buffer was completely consumed */
     150          29 :     return buf_size;
     151             : }
     152             : 
     153           2 : static av_cold int msrle_decode_end(AVCodecContext *avctx)
     154             : {
     155           2 :     MsrleContext *s = avctx->priv_data;
     156             : 
     157             :     /* release the last frame */
     158           2 :     av_frame_free(&s->frame);
     159             : 
     160           2 :     return 0;
     161             : }
     162             : 
     163             : AVCodec ff_msrle_decoder = {
     164             :     .name           = "msrle",
     165             :     .long_name      = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
     166             :     .type           = AVMEDIA_TYPE_VIDEO,
     167             :     .id             = AV_CODEC_ID_MSRLE,
     168             :     .priv_data_size = sizeof(MsrleContext),
     169             :     .init           = msrle_decode_init,
     170             :     .close          = msrle_decode_end,
     171             :     .decode         = msrle_decode_frame,
     172             :     .capabilities   = AV_CODEC_CAP_DR1,
     173             : };

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