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  1. /*
  2.  * Miro VideoXL codec
  3.  * Copyright (c) 2004 Konstantin Shishkov
  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.  * Miro VideoXL codec.
  25.  */
  26.  
  27. #include "libavutil/common.h"
  28. #include "libavutil/intreadwrite.h"
  29. #include "avcodec.h"
  30. #include "internal.h"
  31.  
  32. static const int xl_table[32] = {
  33.    0,   1,   2,   3,   4,   5,   6,   7,
  34.    8,   9,  12,  15,  20,  25,  34,  46,
  35.   64,  82,  94, 103, 108, 113, 116, 119,
  36.  120, 121, 122, 123, 124, 125, 126, 127
  37. };
  38.  
  39. static int decode_frame(AVCodecContext *avctx,
  40.                         void *data, int *got_frame,
  41.                         AVPacket *avpkt)
  42. {
  43.     const uint8_t *buf = avpkt->data;
  44.     int buf_size       = avpkt->size;
  45.     AVFrame *const p   = data;
  46.     uint8_t *Y, *U, *V;
  47.     int i, j, ret;
  48.     int stride;
  49.     uint32_t val;
  50.     int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
  51.  
  52.     if (avctx->width % 4) {
  53.         av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
  54.         return AVERROR_INVALIDDATA;
  55.     }
  56.     if (buf_size < avctx->width * avctx->height) {
  57.         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
  58.         return AVERROR_INVALIDDATA;
  59.     }
  60.  
  61.     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
  62.         return ret;
  63.     p->pict_type = AV_PICTURE_TYPE_I;
  64.     p->key_frame = 1;
  65.  
  66.     Y = p->data[0];
  67.     U = p->data[1];
  68.     V = p->data[2];
  69.  
  70.     stride = avctx->width - 4;
  71.  
  72.     for (i = 0; i < avctx->height; i++) {
  73.         /* lines are stored in reversed order */
  74.         buf += stride;
  75.  
  76.         for (j = 0; j < avctx->width; j += 4) {
  77.             /* value is stored in LE dword with word swapped */
  78.             val  = AV_RL32(buf);
  79.             buf -= 4;
  80.             val  = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
  81.  
  82.             if (!j)
  83.                 y0 = (val & 0x1F) << 2;
  84.             else
  85.                 y0 = y3 + xl_table[val & 0x1F];
  86.             val >>= 5;
  87.             y1    = y0 + xl_table[val & 0x1F];
  88.             val >>= 5;
  89.             y2    = y1 + xl_table[val & 0x1F];
  90.             val >>= 6; /* align to word */
  91.             y3    = y2 + xl_table[val & 0x1F];
  92.             val >>= 5;
  93.             if (!j)
  94.                 c0 = (val & 0x1F) << 2;
  95.             else
  96.                 c0 += xl_table[val & 0x1F];
  97.             val >>= 5;
  98.             if (!j)
  99.                 c1 = (val & 0x1F) << 2;
  100.             else
  101.                 c1 += xl_table[val & 0x1F];
  102.  
  103.             Y[j + 0] = y0 << 1;
  104.             Y[j + 1] = y1 << 1;
  105.             Y[j + 2] = y2 << 1;
  106.             Y[j + 3] = y3 << 1;
  107.  
  108.             U[j >> 2] = c0 << 1;
  109.             V[j >> 2] = c1 << 1;
  110.         }
  111.  
  112.         buf += avctx->width + 4;
  113.         Y   += p->linesize[0];
  114.         U   += p->linesize[1];
  115.         V   += p->linesize[2];
  116.     }
  117.  
  118.     *got_frame = 1;
  119.  
  120.     return buf_size;
  121. }
  122.  
  123. static av_cold int decode_init(AVCodecContext *avctx)
  124. {
  125.     avctx->pix_fmt = AV_PIX_FMT_YUV411P;
  126.  
  127.     return 0;
  128. }
  129.  
  130. AVCodec ff_xl_decoder = {
  131.     .name         = "xl",
  132.     .long_name    = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
  133.     .type         = AVMEDIA_TYPE_VIDEO,
  134.     .id           = AV_CODEC_ID_VIXL,
  135.     .init         = decode_init,
  136.     .decode       = decode_frame,
  137.     .capabilities = CODEC_CAP_DR1,
  138. };
  139.