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/intreadwrite.h" 28#include "avcodec.h" 29 30typedef struct VideoXLContext{ 31 AVCodecContext *avctx; 32 AVFrame pic; 33} VideoXLContext; 34 35static const int xl_table[32] = { 36 0, 1, 2, 3, 4, 5, 6, 7, 37 8, 9, 12, 15, 20, 25, 34, 46, 38 64, 82, 94, 103, 108, 113, 116, 119, 39 120, 121, 122, 123, 124, 125, 126, 127}; 40 41static int decode_frame(AVCodecContext *avctx, 42 void *data, int *data_size, 43 AVPacket *avpkt) 44{ 45 const uint8_t *buf = avpkt->data; 46 int buf_size = avpkt->size; 47 VideoXLContext * const a = avctx->priv_data; 48 AVFrame * const p= (AVFrame*)&a->pic; 49 uint8_t *Y, *U, *V; 50 int i, j; 51 int stride; 52 uint32_t val; 53 int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; 54 55 if(p->data[0]) 56 avctx->release_buffer(avctx, p); 57 58 p->reference = 0; 59 if(avctx->get_buffer(avctx, p) < 0){ 60 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 61 return -1; 62 } 63 p->pict_type= FF_I_TYPE; 64 p->key_frame= 1; 65 66 Y = a->pic.data[0]; 67 U = a->pic.data[1]; 68 V = a->pic.data[2]; 69 70 stride = avctx->width - 4; 71 for (i = 0; i < avctx->height; i++) { 72 /* lines are stored in reversed order */ 73 buf += stride; 74 75 for (j = 0; j < avctx->width; j += 4) { 76 /* value is stored in LE dword with word swapped */ 77 val = AV_RL32(buf); 78 buf -= 4; 79 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); 80 81 if(!j) 82 y0 = (val & 0x1F) << 2; 83 else 84 y0 = y3 + xl_table[val & 0x1F]; 85 val >>= 5; 86 y1 = y0 + xl_table[val & 0x1F]; 87 val >>= 5; 88 y2 = y1 + xl_table[val & 0x1F]; 89 val >>= 6; /* align to word */ 90 y3 = y2 + xl_table[val & 0x1F]; 91 val >>= 5; 92 if(!j) 93 c0 = (val & 0x1F) << 2; 94 else 95 c0 += xl_table[val & 0x1F]; 96 val >>= 5; 97 if(!j) 98 c1 = (val & 0x1F) << 2; 99 else 100 c1 += xl_table[val & 0x1F]; 101 102 Y[j + 0] = y0 << 1; 103 Y[j + 1] = y1 << 1; 104 Y[j + 2] = y2 << 1; 105 Y[j + 3] = y3 << 1; 106 107 U[j >> 2] = c0 << 1; 108 V[j >> 2] = c1 << 1; 109 } 110 111 buf += avctx->width + 4; 112 Y += a->pic.linesize[0]; 113 U += a->pic.linesize[1]; 114 V += a->pic.linesize[2]; 115 } 116 117 *data_size = sizeof(AVFrame); 118 *(AVFrame*)data = a->pic; 119 120 return buf_size; 121} 122 123static av_cold int decode_init(AVCodecContext *avctx){ 124// VideoXLContext * const a = avctx->priv_data; 125 126 avctx->pix_fmt= PIX_FMT_YUV411P; 127 128 return 0; 129} 130 131static av_cold int decode_end(AVCodecContext *avctx){ 132 VideoXLContext * const a = avctx->priv_data; 133 AVFrame *pic = &a->pic; 134 135 if (pic->data[0]) 136 avctx->release_buffer(avctx, pic); 137 138 return 0; 139} 140 141AVCodec xl_decoder = { 142 "xl", 143 AVMEDIA_TYPE_VIDEO, 144 CODEC_ID_VIXL, 145 sizeof(VideoXLContext), 146 decode_init, 147 NULL, 148 decode_end, 149 decode_frame, 150 CODEC_CAP_DR1, 151 .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), 152}; 153