LCOV - code coverage report
Current view: top level - libavcodec - pcxenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 68 100 68.0 %
Date: 2017-12-16 13:57:32 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * PC Paintbrush PCX (.pcx) image encoder
       3             :  * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
       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             :  * PCX image encoder
      25             :  * @author Daniel Verkamp
      26             :  * @see http://bespin.org/~qz/pc-gpe/pcx.txt
      27             :  */
      28             : 
      29             : #include "avcodec.h"
      30             : #include "bytestream.h"
      31             : #include "libavutil/imgutils.h"
      32             : #include "internal.h"
      33             : 
      34             : static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
      35             : 
      36           1 : static av_cold int pcx_encode_init(AVCodecContext *avctx)
      37             : {
      38             : #if FF_API_CODED_FRAME
      39             : FF_DISABLE_DEPRECATION_WARNINGS
      40           1 :     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
      41           1 :     avctx->coded_frame->key_frame = 1;
      42             : FF_ENABLE_DEPRECATION_WARNINGS
      43             : #endif
      44             : 
      45           1 :     return 0;
      46             : }
      47             : 
      48             : /**
      49             :  * PCX run-length encoder
      50             :  * @param dst output buffer
      51             :  * @param dst_size size of output buffer
      52             :  * @param src input buffer
      53             :  * @param src_plane_size size of one plane of input buffer in bytes
      54             :  * @param nplanes number of planes in input buffer
      55             :  * @return number of bytes written to dst or -1 on error
      56             :  * @bug will not work for nplanes != 1 && bpp != 8
      57             :  */
      58        3744 : static int pcx_rle_encode(      uint8_t *dst, int dst_size,
      59             :                           const uint8_t *src, int src_plane_size, int nplanes)
      60             : {
      61             :     int p;
      62        3744 :     const uint8_t *dst_start = dst;
      63             : 
      64             :     // check worst-case upper bound on dst_size
      65        3744 :     if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
      66           0 :         return AVERROR(EINVAL);
      67             : 
      68       14976 :     for (p = 0; p < nplanes; p++) {
      69       11232 :         int count = 1;
      70       11232 :         const uint8_t *src_plane = src + p;
      71       11232 :         const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
      72       11232 :         uint8_t prev = *src_plane;
      73       11232 :         src_plane += nplanes;
      74             : 
      75     3942432 :         for (; ; src_plane += nplanes) {
      76     7896096 :             if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
      77             :                 // current byte is same as prev
      78      204027 :                 ++count;
      79             :             } else {
      80             :                 // output prev * count
      81     3749637 :                 if (count != 1 || prev >= 0xC0)
      82      985221 :                     *dst++ = 0xC0 | count;
      83     3749637 :                 *dst++ = prev;
      84             : 
      85     3749637 :                 if (src_plane == src_plane_end)
      86       11232 :                     break;
      87             : 
      88             :                 // start new run
      89     3738405 :                 count = 1;
      90     3738405 :                 prev = *src_plane;
      91             :             }
      92             :         }
      93             :     }
      94             : 
      95        3744 :     return dst - dst_start;
      96             : }
      97             : 
      98          13 : static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
      99             :                             const AVFrame *frame, int *got_packet)
     100             : {
     101             :     const uint8_t *buf_end;
     102             :     uint8_t *buf;
     103             : 
     104             :     int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
     105          13 :     const uint32_t *pal = NULL;
     106             :     uint32_t palette256[256];
     107             :     const uint8_t *src;
     108             : 
     109          13 :     if (avctx->width > 65535 || avctx->height > 65535) {
     110           0 :         av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
     111           0 :         return AVERROR(EINVAL);
     112             :     }
     113             : 
     114          13 :     switch (avctx->pix_fmt) {
     115          13 :     case AV_PIX_FMT_RGB24:
     116          13 :         bpp = 8;
     117          13 :         nplanes = 3;
     118          13 :         break;
     119           0 :     case AV_PIX_FMT_RGB8:
     120             :     case AV_PIX_FMT_BGR8:
     121             :     case AV_PIX_FMT_RGB4_BYTE:
     122             :     case AV_PIX_FMT_BGR4_BYTE:
     123             :     case AV_PIX_FMT_GRAY8:
     124           0 :         bpp = 8;
     125           0 :         nplanes = 1;
     126           0 :         avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
     127           0 :         pal = palette256;
     128           0 :         break;
     129           0 :     case AV_PIX_FMT_PAL8:
     130           0 :         bpp = 8;
     131           0 :         nplanes = 1;
     132           0 :         pal = (uint32_t *)frame->data[1];
     133           0 :         break;
     134           0 :     case AV_PIX_FMT_MONOBLACK:
     135           0 :         bpp = 1;
     136           0 :         nplanes = 1;
     137           0 :         pal = monoblack_pal;
     138           0 :         break;
     139           0 :     default:
     140           0 :         av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
     141           0 :         return AVERROR(EINVAL);
     142             :     }
     143             : 
     144          13 :     line_bytes = (avctx->width * bpp + 7) >> 3;
     145          13 :     line_bytes = (line_bytes + 1) & ~1;
     146             : 
     147          13 :     max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
     148          13 :     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
     149           0 :         return ret;
     150          13 :     buf     = pkt->data;
     151          13 :     buf_end = pkt->data + pkt->size;
     152             : 
     153          13 :     sw = avctx->sample_aspect_ratio.num;
     154          13 :     sh = avctx->sample_aspect_ratio.den;
     155          13 :     if (sw > 0xFFFFu || sh > 0xFFFFu)
     156           0 :         av_reduce(&sw, &sh, sw, sh, 0xFFFFu);
     157             : 
     158          13 :     bytestream_put_byte(&buf, 10);                  // manufacturer
     159          13 :     bytestream_put_byte(&buf, 5);                   // version
     160          13 :     bytestream_put_byte(&buf, 1);                   // encoding
     161          13 :     bytestream_put_byte(&buf, bpp);                 // bits per pixel per plane
     162          13 :     bytestream_put_le16(&buf, 0);                   // x min
     163          13 :     bytestream_put_le16(&buf, 0);                   // y min
     164          13 :     bytestream_put_le16(&buf, avctx->width - 1);    // x max
     165          13 :     bytestream_put_le16(&buf, avctx->height - 1);   // y max
     166          13 :     bytestream_put_le16(&buf, sw);                  // horizontal DPI
     167          13 :     bytestream_put_le16(&buf, sh);                  // vertical DPI
     168         221 :     for (i = 0; i < 16; i++)
     169         208 :         bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
     170          13 :     bytestream_put_byte(&buf, 0);                   // reserved
     171          13 :     bytestream_put_byte(&buf, nplanes);             // number of planes
     172          13 :     bytestream_put_le16(&buf, line_bytes);          // scanline plane size in bytes
     173             : 
     174         806 :     while (buf - pkt->data < 128)
     175         780 :         *buf++= 0;
     176             : 
     177          13 :     src = frame->data[0];
     178             : 
     179        3757 :     for (y = 0; y < avctx->height; y++) {
     180        3744 :         if ((written = pcx_rle_encode(buf, buf_end - buf,
     181             :                                       src, line_bytes, nplanes)) < 0) {
     182           0 :             av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
     183           0 :             return AVERROR_BUG;
     184             :         }
     185        3744 :         buf += written;
     186        3744 :         src += frame->linesize[0];
     187             :     }
     188             : 
     189          13 :     if (nplanes == 1 && bpp == 8) {
     190           0 :         if (buf_end - buf < 257) {
     191           0 :             av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
     192           0 :             return AVERROR_BUG;
     193             :         }
     194           0 :         bytestream_put_byte(&buf, 12);
     195           0 :         for (i = 0; i < 256; i++) {
     196           0 :             bytestream_put_be24(&buf, pal[i]);
     197             :         }
     198             :     }
     199             : 
     200          13 :     pkt->size   = buf - pkt->data;
     201          13 :     pkt->flags |= AV_PKT_FLAG_KEY;
     202          13 :     *got_packet = 1;
     203             : 
     204          13 :     return 0;
     205             : }
     206             : 
     207             : AVCodec ff_pcx_encoder = {
     208             :     .name           = "pcx",
     209             :     .long_name      = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
     210             :     .type           = AVMEDIA_TYPE_VIDEO,
     211             :     .id             = AV_CODEC_ID_PCX,
     212             :     .init           = pcx_encode_init,
     213             :     .encode2        = pcx_encode_frame,
     214             :     .pix_fmts       = (const enum AVPixelFormat[]){
     215             :         AV_PIX_FMT_RGB24,
     216             :         AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
     217             :         AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
     218             :         AV_PIX_FMT_MONOBLACK,
     219             :         AV_PIX_FMT_NONE
     220             :     },
     221             : };

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