3 * Copyright (c) 2004 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
27 #include "libavutil/common.h"
28 #include "libavutil/intreadwrite.h"
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
39 static int decode_frame(AVCodecContext *avctx,
40 void *data, int *got_frame,
43 const uint8_t *buf = avpkt->data;
44 int buf_size = avpkt->size;
45 AVFrame * const p = data;
50 int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
52 if (avctx->width & 3) {
53 av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
54 return AVERROR_INVALIDDATA;
57 if (buf_size < avctx->width * avctx->height) {
58 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
59 return AVERROR_INVALIDDATA;
62 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
64 p->pict_type = AV_PICTURE_TYPE_I;
71 stride = avctx->width - 4;
73 for (i = 0; i < avctx->height; i++) {
74 /* lines are stored in reversed order */
77 for (j = 0; j < avctx->width; j += 4) {
78 /* value is stored in LE dword with word swapped */
81 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
84 y0 = (val & 0x1F) << 2;
86 y0 = y3 + xl_table[val & 0x1F];
88 y1 = y0 + xl_table[val & 0x1F];
90 y2 = y1 + xl_table[val & 0x1F];
91 val >>= 6; /* align to word */
92 y3 = y2 + xl_table[val & 0x1F];
95 c0 = (val & 0x1F) << 2;
97 c0 += xl_table[val & 0x1F];
100 c1 = (val & 0x1F) << 2;
102 c1 += xl_table[val & 0x1F];
113 buf += avctx->width + 4;
124 static av_cold int decode_init(AVCodecContext *avctx)
126 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
131 AVCodec ff_xl_decoder = {
133 .type = AVMEDIA_TYPE_VIDEO,
134 .id = AV_CODEC_ID_VIXL,
136 .decode = decode_frame,
137 .capabilities = CODEC_CAP_DR1,
138 .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),