LCOV - code coverage report
Current view: top level - src/libavcodec - 8bps.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 58 82 70.7 %
Date: 2017-08-17 10:06:07 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Quicktime Planar RGB (8BPS) Video Decoder
       3             :  * Copyright (C) 2003 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             :  * QT 8BPS Video Decoder by Roberto Togni
      25             :  * For more information about the 8BPS format, visit:
      26             :  *   http://www.pcisys.net/~melanson/codecs/
      27             :  *
      28             :  * Supports: PAL8 (RGB 8bpp, paletted)
      29             :  *         : BGR24 (RGB 24bpp) (can also output it as RGB32)
      30             :  *         : RGB32 (RGB 32bpp, 4th plane is alpha)
      31             :  */
      32             : 
      33             : #include <stdio.h>
      34             : #include <stdlib.h>
      35             : #include <string.h>
      36             : 
      37             : #include "libavutil/internal.h"
      38             : #include "libavutil/intreadwrite.h"
      39             : #include "avcodec.h"
      40             : #include "internal.h"
      41             : 
      42             : 
      43             : static const enum AVPixelFormat pixfmt_rgb24[] = {
      44             :     AV_PIX_FMT_BGR24, AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE };
      45             : 
      46             : typedef struct EightBpsContext {
      47             :     AVCodecContext *avctx;
      48             : 
      49             :     unsigned char planes;
      50             :     unsigned char planemap[4];
      51             : 
      52             :     uint32_t pal[256];
      53             : } EightBpsContext;
      54             : 
      55          13 : static int decode_frame(AVCodecContext *avctx, void *data,
      56             :                         int *got_frame, AVPacket *avpkt)
      57             : {
      58          13 :     AVFrame *frame = data;
      59          13 :     const uint8_t *buf = avpkt->data;
      60          13 :     int buf_size       = avpkt->size;
      61          13 :     EightBpsContext * const c = avctx->priv_data;
      62          13 :     const unsigned char *encoded = buf;
      63             :     unsigned char *pixptr, *pixptr_end;
      64          13 :     unsigned int height = avctx->height; // Real image height
      65             :     unsigned int dlen, p, row;
      66             :     const unsigned char *lp, *dp, *ep;
      67             :     unsigned char count;
      68             :     unsigned int px_inc;
      69          13 :     unsigned int planes     = c->planes;
      70          13 :     unsigned char *planemap = c->planemap;
      71             :     int ret;
      72             : 
      73          13 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      74           0 :         return ret;
      75             : 
      76          13 :     ep = encoded + buf_size;
      77             : 
      78             :     /* Set data pointer after line lengths */
      79          13 :     dp = encoded + planes * (height << 1);
      80             : 
      81          13 :     px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_0RGB32);
      82             : 
      83          25 :     for (p = 0; p < planes; p++) {
      84             :         /* Lines length pointer for this plane */
      85          13 :         lp = encoded + p * (height << 1);
      86             : 
      87             :         /* Decode a plane */
      88        3051 :         for (row = 0; row < height; row++) {
      89        3039 :             pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
      90        3039 :             pixptr_end = pixptr + frame->linesize[0];
      91        3039 :             if (ep - lp < row * 2 + 2)
      92           0 :                 return AVERROR_INVALIDDATA;
      93        3039 :             dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
      94             :             /* Decode a row of this plane */
      95       82184 :             while (dlen > 0) {
      96       76107 :                 if (ep - dp <= 1)
      97           0 :                     return AVERROR_INVALIDDATA;
      98       76107 :                 if ((count = *dp++) <= 127) {
      99       37173 :                     count++;
     100       37173 :                     dlen -= count + 1;
     101       37173 :                     if (pixptr_end - pixptr < count * px_inc)
     102           0 :                         break;
     103       37173 :                     if (ep - dp < count)
     104           1 :                         return AVERROR_INVALIDDATA;
     105      971883 :                     while (count--) {
     106      897539 :                         *pixptr = *dp++;
     107      897539 :                         pixptr += px_inc;
     108             :                     }
     109             :                 } else {
     110       38934 :                     count = 257 - count;
     111       38934 :                     if (pixptr_end - pixptr < count * px_inc)
     112           0 :                         break;
     113      274214 :                     while (count--) {
     114      196346 :                         *pixptr = *dp;
     115      196346 :                         pixptr += px_inc;
     116             :                     }
     117       38934 :                     dp++;
     118       38934 :                     dlen -= 2;
     119             :                 }
     120             :             }
     121             :         }
     122             :     }
     123             : 
     124          12 :     if (avctx->bits_per_coded_sample <= 8) {
     125             :         int size;
     126          12 :         const uint8_t *pal = av_packet_get_side_data(avpkt,
     127             :                                                      AV_PKT_DATA_PALETTE,
     128             :                                                      &size);
     129          12 :         if (pal && size == AVPALETTE_SIZE) {
     130           1 :             frame->palette_has_changed = 1;
     131           1 :             memcpy(c->pal, pal, AVPALETTE_SIZE);
     132          11 :         } else if (pal) {
     133           0 :             av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
     134             :         }
     135             : 
     136          12 :         memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
     137             :     }
     138             : 
     139          12 :     *got_frame = 1;
     140             : 
     141             :     /* always report that the buffer was completely consumed */
     142          12 :     return buf_size;
     143             : }
     144             : 
     145           2 : static av_cold int decode_init(AVCodecContext *avctx)
     146             : {
     147           2 :     EightBpsContext * const c = avctx->priv_data;
     148             : 
     149           2 :     c->avctx       = avctx;
     150             : 
     151           2 :     switch (avctx->bits_per_coded_sample) {
     152           2 :     case 8:
     153           2 :         avctx->pix_fmt = AV_PIX_FMT_PAL8;
     154           2 :         c->planes      = 1;
     155           2 :         c->planemap[0] = 0; // 1st plane is palette indexes
     156           2 :         break;
     157           0 :     case 24:
     158           0 :         avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
     159           0 :         c->planes      = 3;
     160           0 :         c->planemap[0] = 2; // 1st plane is red
     161           0 :         c->planemap[1] = 1; // 2nd plane is green
     162           0 :         c->planemap[2] = 0; // 3rd plane is blue
     163           0 :         break;
     164           0 :     case 32:
     165           0 :         avctx->pix_fmt = AV_PIX_FMT_RGB32;
     166           0 :         c->planes      = 4;
     167             :         /* handle planemap setup later for decoding rgb24 data as rbg32 */
     168           0 :         break;
     169           0 :     default:
     170           0 :         av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
     171             :                avctx->bits_per_coded_sample);
     172           0 :         return AVERROR_INVALIDDATA;
     173             :     }
     174             : 
     175           2 :     if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
     176           0 :         c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
     177           0 :         c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
     178           0 :         c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
     179           0 :         c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
     180             :     }
     181           2 :     return 0;
     182             : }
     183             : 
     184             : AVCodec ff_eightbps_decoder = {
     185             :     .name           = "8bps",
     186             :     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
     187             :     .type           = AVMEDIA_TYPE_VIDEO,
     188             :     .id             = AV_CODEC_ID_8BPS,
     189             :     .priv_data_size = sizeof(EightBpsContext),
     190             :     .init           = decode_init,
     191             :     .decode         = decode_frame,
     192             :     .capabilities   = AV_CODEC_CAP_DR1,
     193             : };

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