libavcodec/xl.c

   1 /*
   2  * Miro VideoXL codec
   3  * Copyright (c) 2004 Konstantin Shishkov
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 typedef struct VideoXLContext{
  33     AVCodecContext *avctx;
  34     AVFrame pic;
  35 } VideoXLContext;
  36
  37 static const int xl_table[32] = {
  38    0,   1,   2,   3,   4,   5,   6,   7,
  39    8,   9,  12,  15,  20,  25,  34,  46,
  40   64,  82,  94, 103, 108, 113, 116, 119,
  41  120, 121, 122, 123, 124, 125, 126, 127};
  42
  43 static int decode_frame(AVCodecContext *avctx,
  44                         void *data, int *got_frame,
  45                         AVPacket *avpkt)
  46 {
  47     const uint8_t *buf = avpkt->data;
  48     int buf_size = avpkt->size;
  49     VideoXLContext * const a = avctx->priv_data;
  50     AVFrame * const p = &a->pic;
  51     uint8_t *Y, *U, *V;
  52     int i, j, ret;
  53     int stride;
  54     uint32_t val;
  55     int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
  56
  57     if(p->data[0])
  58         avctx->release_buffer(avctx, p);
  59
  60     p->reference = 0;
  61     if ((ret = ff_get_buffer(avctx, p)) < 0){
  62         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  63         return ret;
  64     }
  65     p->pict_type= AV_PICTURE_TYPE_I;
  66     p->key_frame= 1;
  67
  68     Y = a->pic.data[0];
  69     U = a->pic.data[1];
  70     V = a->pic.data[2];
  71
  72     stride = avctx->width - 4;
  73
  74     if (buf_size < avctx->width * avctx->height) {
  75         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
  76         return AVERROR_INVALIDDATA;
  77     }
  78
  79     for (i = 0; i < avctx->height; i++) {
  80         /* lines are stored in reversed order */
  81         buf += stride;
  82
  83         for (j = 0; j < avctx->width; j += 4) {
  84             /* value is stored in LE dword with word swapped */
  85             val = AV_RL32(buf);
  86             buf -= 4;
  87             val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
  88
  89             if(!j)
  90                 y0 = (val & 0x1F) << 2;
  91             else
  92                 y0 = y3 + xl_table[val & 0x1F];
  93             val >>= 5;
  94             y1 = y0 + xl_table[val & 0x1F];
  95             val >>= 5;
  96             y2 = y1 + xl_table[val & 0x1F];
  97             val >>= 6; /* align to word */
  98             y3 = y2 + xl_table[val & 0x1F];
  99             val >>= 5;
 100             if(!j)
 101                 c0 = (val & 0x1F) << 2;
 102             else
 103                 c0 += xl_table[val & 0x1F];
 104             val >>= 5;
 105             if(!j)
 106                 c1 = (val & 0x1F) << 2;
 107             else
 108                 c1 += xl_table[val & 0x1F];
 109
 110             Y[j + 0] = y0 << 1;
 111             Y[j + 1] = y1 << 1;
 112             Y[j + 2] = y2 << 1;
 113             Y[j + 3] = y3 << 1;
 114
 115             U[j >> 2] = c0 << 1;
 116             V[j >> 2] = c1 << 1;
 117         }
 118
 119         buf += avctx->width + 4;
 120         Y += a->pic.linesize[0];
 121         U += a->pic.linesize[1];
 122         V += a->pic.linesize[2];
 123     }
 124
 125     *got_frame = 1;
 126     *(AVFrame*)data = a->pic;
 127
 128     return buf_size;
 129 }
 130
 131 static av_cold int decode_init(AVCodecContext *avctx){
 132 //    VideoXLContext * const a = avctx->priv_data;
 133
 134     avctx->pix_fmt= AV_PIX_FMT_YUV411P;
 135
 136     return 0;
 137 }
 138
 139 static av_cold int decode_end(AVCodecContext *avctx){
 140     VideoXLContext * const a = avctx->priv_data;
 141     AVFrame *pic = &a->pic;
 142
 143     if (pic->data[0])
 144         avctx->release_buffer(avctx, pic);
 145
 146     return 0;
 147 }
 148
 149 AVCodec ff_xl_decoder = {
 150     .name           = "xl",
 151     .type           = AVMEDIA_TYPE_VIDEO,
 152     .id             = AV_CODEC_ID_VIXL,
 153     .priv_data_size = sizeof(VideoXLContext),
 154     .init           = decode_init,
 155     .close          = decode_end,
 156     .decode         = decode_frame,
 157     .capabilities   = CODEC_CAP_DR1,
 158     .long_name      = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
 159 };