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 "codec_internal.h" 31#include "internal.h" 32 33static const int xl_table[32] = { 34 0, 1, 2, 3, 4, 5, 6, 7, 35 8, 9, 12, 15, 20, 25, 34, 46, 36 64, 82, 94, 103, 108, 113, 116, 119, 37 120, 121, 122, 123, 124, 125, 126, 127 38}; 39 40static int decode_frame(AVCodecContext *avctx, AVFrame *p, 41 int *got_frame, AVPacket *avpkt) 42{ 43 const uint8_t *buf = avpkt->data; 44 int buf_size = avpkt->size; 45 uint8_t *Y, *U, *V; 46 int i, j, ret; 47 int stride; 48 uint32_t val; 49 int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; 50 51 if (avctx->width % 4) { 52 av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n"); 53 return AVERROR_INVALIDDATA; 54 } 55 if (buf_size < avctx->width * avctx->height) { 56 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); 57 return AVERROR_INVALIDDATA; 58 } 59 60 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 61 return ret; 62 p->pict_type = AV_PICTURE_TYPE_I; 63 p->key_frame = 1; 64 65 Y = p->data[0]; 66 U = p->data[1]; 67 V = p->data[2]; 68 69 stride = avctx->width - 4; 70 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 += p->linesize[0]; 113 U += p->linesize[1]; 114 V += p->linesize[2]; 115 } 116 117 *got_frame = 1; 118 119 return buf_size; 120} 121 122static av_cold int decode_init(AVCodecContext *avctx) 123{ 124 avctx->pix_fmt = AV_PIX_FMT_YUV411P; 125 126 return 0; 127} 128 129const FFCodec ff_xl_decoder = { 130 .p.name = "xl", 131 .p.long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), 132 .p.type = AVMEDIA_TYPE_VIDEO, 133 .p.id = AV_CODEC_ID_VIXL, 134 .init = decode_init, 135 FF_CODEC_DECODE_CB(decode_frame), 136 .p.capabilities = AV_CODEC_CAP_DR1, 137 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 138}; 139