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/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= AV_PICTURE_TYPE_I; 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 72 if (buf_size < avctx->width * avctx->height) { 73 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); 74 return AVERROR_INVALIDDATA; 75 } 76 77 for (i = 0; i < avctx->height; i++) { 78 /* lines are stored in reversed order */ 79 buf += stride; 80 81 for (j = 0; j < avctx->width; j += 4) { 82 /* value is stored in LE dword with word swapped */ 83 val = AV_RL32(buf); 84 buf -= 4; 85 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); 86 87 if(!j) 88 y0 = (val & 0x1F) << 2; 89 else 90 y0 = y3 + xl_table[val & 0x1F]; 91 val >>= 5; 92 y1 = y0 + xl_table[val & 0x1F]; 93 val >>= 5; 94 y2 = y1 + xl_table[val & 0x1F]; 95 val >>= 6; /* align to word */ 96 y3 = y2 + xl_table[val & 0x1F]; 97 val >>= 5; 98 if(!j) 99 c0 = (val & 0x1F) << 2; 100 else 101 c0 += xl_table[val & 0x1F]; 102 val >>= 5; 103 if(!j) 104 c1 = (val & 0x1F) << 2; 105 else 106 c1 += xl_table[val & 0x1F]; 107 108 Y[j + 0] = y0 << 1; 109 Y[j + 1] = y1 << 1; 110 Y[j + 2] = y2 << 1; 111 Y[j + 3] = y3 << 1; 112 113 U[j >> 2] = c0 << 1; 114 V[j >> 2] = c1 << 1; 115 } 116 117 buf += avctx->width + 4; 118 Y += a->pic.linesize[0]; 119 U += a->pic.linesize[1]; 120 V += a->pic.linesize[2]; 121 } 122 123 *data_size = sizeof(AVFrame); 124 *(AVFrame*)data = a->pic; 125 126 return buf_size; 127} 128 129static av_cold int decode_init(AVCodecContext *avctx){ 130// VideoXLContext * const a = avctx->priv_data; 131 132 avctx->pix_fmt= PIX_FMT_YUV411P; 133 134 return 0; 135} 136 137static av_cold int decode_end(AVCodecContext *avctx){ 138 VideoXLContext * const a = avctx->priv_data; 139 AVFrame *pic = &a->pic; 140 141 if (pic->data[0]) 142 avctx->release_buffer(avctx, pic); 143 144 return 0; 145} 146 147AVCodec ff_xl_decoder = { 148 .name = "xl", 149 .type = AVMEDIA_TYPE_VIDEO, 150 .id = CODEC_ID_VIXL, 151 .priv_data_size = sizeof(VideoXLContext), 152 .init = decode_init, 153 .close = decode_end, 154 .decode = decode_frame, 155 .capabilities = CODEC_CAP_DR1, 156 .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), 157}; 158