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  1. /*
  2.  * Pictor/PC Paint decoder
  3.  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
  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.  * Pictor/PC Paint decoder
  25.  */
  26.  
  27. #include "libavutil/imgutils.h"
  28. #include "avcodec.h"
  29. #include "bytestream.h"
  30. #include "cga_data.h"
  31. #include "internal.h"
  32.  
  33. typedef struct PicContext {
  34.     int width, height;
  35.     int nb_planes;
  36.     GetByteContext g;
  37. } PicContext;
  38.  
  39. static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
  40.                            int *x, int *y)
  41. {
  42.     while (run > 0) {
  43.         uint8_t *d = frame->data[0] + *y * frame->linesize[0];
  44.         if (*x + run >= s->width) {
  45.             int n = s->width - *x;
  46.             memset(d + *x, value, n);
  47.             run -= n;
  48.             *x = 0;
  49.             *y -= 1;
  50.             if (*y < 0)
  51.                 break;
  52.         } else {
  53.             memset(d + *x, value, run);
  54.             *x += run;
  55.             break;
  56.         }
  57.     }
  58. }
  59.  
  60. static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
  61.                       int *x, int *y, int *plane, int bits_per_plane)
  62. {
  63.     uint8_t *d;
  64.     int shift = *plane * bits_per_plane;
  65.     int mask  = ((1 << bits_per_plane) - 1) << shift;
  66.     value   <<= shift;
  67.  
  68.     while (run > 0) {
  69.         int j;
  70.         for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
  71.             d = frame->data[0] + *y * frame->linesize[0];
  72.             d[*x] |= (value >> j) & mask;
  73.             *x += 1;
  74.             if (*x == s->width) {
  75.                 *y -= 1;
  76.                 *x = 0;
  77.                 if (*y < 0) {
  78.                    *y = s->height - 1;
  79.                    *plane += 1;
  80.                    value <<= bits_per_plane;
  81.                    mask  <<= bits_per_plane;
  82.                    if (*plane >= s->nb_planes)
  83.                        break;
  84.                 }
  85.             }
  86.         }
  87.         run--;
  88.     }
  89. }
  90.  
  91. static const uint8_t cga_mode45_index[6][4] = {
  92.     [0] = { 0, 3,  5,   7 }, // mode4, palette#1, low intensity
  93.     [1] = { 0, 2,  4,   6 }, // mode4, palette#2, low intensity
  94.     [2] = { 0, 3,  4,   7 }, // mode5, low intensity
  95.     [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
  96.     [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
  97.     [5] = { 0, 11, 12, 15 }, // mode5, high intensity
  98. };
  99.  
  100. static int decode_frame(AVCodecContext *avctx,
  101.                         void *data, int *got_frame,
  102.                         AVPacket *avpkt)
  103. {
  104.     PicContext *s = avctx->priv_data;
  105.     AVFrame *frame = data;
  106.     uint32_t *palette;
  107.     int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
  108.     int i, x, y, plane, tmp, ret, val;
  109.  
  110.     bytestream2_init(&s->g, avpkt->data, avpkt->size);
  111.  
  112.     if (bytestream2_get_bytes_left(&s->g) < 11)
  113.         return AVERROR_INVALIDDATA;
  114.  
  115.     if (bytestream2_get_le16u(&s->g) != 0x1234)
  116.         return AVERROR_INVALIDDATA;
  117.  
  118.     s->width       = bytestream2_get_le16u(&s->g);
  119.     s->height      = bytestream2_get_le16u(&s->g);
  120.     bytestream2_skip(&s->g, 4);
  121.     tmp            = bytestream2_get_byteu(&s->g);
  122.     bits_per_plane = tmp & 0xF;
  123.     s->nb_planes   = (tmp >> 4) + 1;
  124.     bpp            = bits_per_plane * s->nb_planes;
  125.     if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
  126.         avpriv_request_sample(avctx, "Unsupported bit depth");
  127.         return AVERROR_PATCHWELCOME;
  128.     }
  129.  
  130.     if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
  131.         bytestream2_skip(&s->g, 2);
  132.         etype = bytestream2_get_le16(&s->g);
  133.         esize = bytestream2_get_le16(&s->g);
  134.         if (bytestream2_get_bytes_left(&s->g) < esize)
  135.             return AVERROR_INVALIDDATA;
  136.     } else {
  137.         etype = -1;
  138.         esize = 0;
  139.     }
  140.  
  141.     avctx->pix_fmt = AV_PIX_FMT_PAL8;
  142.  
  143.     if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
  144.         return -1;
  145.     if (s->width != avctx->width && s->height != avctx->height) {
  146.         avcodec_set_dimensions(avctx, s->width, s->height);
  147.     }
  148.  
  149.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  150.         return ret;
  151.     memset(frame->data[0], 0, s->height * frame->linesize[0]);
  152.     frame->pict_type           = AV_PICTURE_TYPE_I;
  153.     frame->palette_has_changed = 1;
  154.  
  155.     pos_after_pal = bytestream2_tell(&s->g) + esize;
  156.     palette = (uint32_t*)frame->data[1];
  157.     if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
  158.         int idx = bytestream2_get_byte(&s->g);
  159.         npal = 4;
  160.         for (i = 0; i < npal; i++)
  161.             palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
  162.     } else if (etype == 2) {
  163.         npal = FFMIN(esize, 16);
  164.         for (i = 0; i < npal; i++) {
  165.             int pal_idx = bytestream2_get_byte(&s->g);
  166.             palette[i]  = ff_cga_palette[FFMIN(pal_idx, 15)];
  167.         }
  168.     } else if (etype == 3) {
  169.         npal = FFMIN(esize, 16);
  170.         for (i = 0; i < npal; i++) {
  171.             int pal_idx = bytestream2_get_byte(&s->g);
  172.             palette[i]  = ff_ega_palette[FFMIN(pal_idx, 63)];
  173.         }
  174.     } else if (etype == 4 || etype == 5) {
  175.         npal = FFMIN(esize / 3, 256);
  176.         for (i = 0; i < npal; i++) {
  177.             palette[i] = bytestream2_get_be24(&s->g) << 2;
  178.             palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
  179.         }
  180.     } else {
  181.         if (bpp == 1) {
  182.             npal = 2;
  183.             palette[0] = 0xFF000000;
  184.             palette[1] = 0xFFFFFFFF;
  185.         } else if (bpp == 2) {
  186.             npal = 4;
  187.             for (i = 0; i < npal; i++)
  188.                 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
  189.         } else {
  190.             npal = 16;
  191.             memcpy(palette, ff_cga_palette, npal * 4);
  192.         }
  193.     }
  194.     // fill remaining palette entries
  195.     memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
  196.     // skip remaining palette bytes
  197.     bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
  198.  
  199.     val = 0;
  200.     y = s->height - 1;
  201.     if (bytestream2_get_le16(&s->g)) {
  202.         x = 0;
  203.         plane = 0;
  204.         while (bytestream2_get_bytes_left(&s->g) >= 6) {
  205.             int stop_size, marker, t1, t2;
  206.  
  207.             t1        = bytestream2_get_bytes_left(&s->g);
  208.             t2        = bytestream2_get_le16(&s->g);
  209.             stop_size = t1 - FFMIN(t1, t2);
  210.             // ignore uncompressed block size
  211.             bytestream2_skip(&s->g, 2);
  212.             marker    = bytestream2_get_byte(&s->g);
  213.  
  214.             while (plane < s->nb_planes &&
  215.                    bytestream2_get_bytes_left(&s->g) > stop_size) {
  216.                 int run = 1;
  217.                 val = bytestream2_get_byte(&s->g);
  218.                 if (val == marker) {
  219.                     run = bytestream2_get_byte(&s->g);
  220.                     if (run == 0)
  221.                         run = bytestream2_get_le16(&s->g);
  222.                     val = bytestream2_get_byte(&s->g);
  223.                 }
  224.                 if (!bytestream2_get_bytes_left(&s->g))
  225.                     break;
  226.  
  227.                 if (bits_per_plane == 8) {
  228.                     picmemset_8bpp(s, frame, val, run, &x, &y);
  229.                     if (y < 0)
  230.                         goto finish;
  231.                 } else {
  232.                     picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
  233.                 }
  234.             }
  235.         }
  236.  
  237.         if (x < avctx->width) {
  238.             int run = (y + 1) * avctx->width - x;
  239.             if (bits_per_plane == 8)
  240.                 picmemset_8bpp(s, frame, val, run, &x, &y);
  241.             else
  242.                 picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
  243.         }
  244.     } else {
  245.         while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
  246.             memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
  247.             bytestream2_skip(&s->g, avctx->width);
  248.             y--;
  249.         }
  250.     }
  251. finish:
  252.  
  253.     *got_frame      = 1;
  254.     return avpkt->size;
  255. }
  256.  
  257. AVCodec ff_pictor_decoder = {
  258.     .name           = "pictor",
  259.     .long_name      = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
  260.     .type           = AVMEDIA_TYPE_VIDEO,
  261.     .id             = AV_CODEC_ID_PICTOR,
  262.     .priv_data_size = sizeof(PicContext),
  263.     .decode         = decode_frame,
  264.     .capabilities   = CODEC_CAP_DR1,
  265. };
  266.