0,0 → 1,138 |
/* |
* Miro VideoXL codec |
* Copyright (c) 2004 Konstantin Shishkov |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* Miro VideoXL codec. |
*/ |
|
#include "libavutil/common.h" |
#include "libavutil/intreadwrite.h" |
#include "avcodec.h" |
#include "internal.h" |
|
static const int xl_table[32] = { |
0, 1, 2, 3, 4, 5, 6, 7, |
8, 9, 12, 15, 20, 25, 34, 46, |
64, 82, 94, 103, 108, 113, 116, 119, |
120, 121, 122, 123, 124, 125, 126, 127 |
}; |
|
static int decode_frame(AVCodecContext *avctx, |
void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
const uint8_t *buf = avpkt->data; |
int buf_size = avpkt->size; |
AVFrame *const p = data; |
uint8_t *Y, *U, *V; |
int i, j, ret; |
int stride; |
uint32_t val; |
int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; |
|
if (avctx->width % 4) { |
av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n"); |
return AVERROR_INVALIDDATA; |
} |
if (buf_size < avctx->width * avctx->height) { |
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); |
return AVERROR_INVALIDDATA; |
} |
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
return ret; |
p->pict_type = AV_PICTURE_TYPE_I; |
p->key_frame = 1; |
|
Y = p->data[0]; |
U = p->data[1]; |
V = p->data[2]; |
|
stride = avctx->width - 4; |
|
for (i = 0; i < avctx->height; i++) { |
/* lines are stored in reversed order */ |
buf += stride; |
|
for (j = 0; j < avctx->width; j += 4) { |
/* value is stored in LE dword with word swapped */ |
val = AV_RL32(buf); |
buf -= 4; |
val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); |
|
if (!j) |
y0 = (val & 0x1F) << 2; |
else |
y0 = y3 + xl_table[val & 0x1F]; |
val >>= 5; |
y1 = y0 + xl_table[val & 0x1F]; |
val >>= 5; |
y2 = y1 + xl_table[val & 0x1F]; |
val >>= 6; /* align to word */ |
y3 = y2 + xl_table[val & 0x1F]; |
val >>= 5; |
if (!j) |
c0 = (val & 0x1F) << 2; |
else |
c0 += xl_table[val & 0x1F]; |
val >>= 5; |
if (!j) |
c1 = (val & 0x1F) << 2; |
else |
c1 += xl_table[val & 0x1F]; |
|
Y[j + 0] = y0 << 1; |
Y[j + 1] = y1 << 1; |
Y[j + 2] = y2 << 1; |
Y[j + 3] = y3 << 1; |
|
U[j >> 2] = c0 << 1; |
V[j >> 2] = c1 << 1; |
} |
|
buf += avctx->width + 4; |
Y += p->linesize[0]; |
U += p->linesize[1]; |
V += p->linesize[2]; |
} |
|
*got_frame = 1; |
|
return buf_size; |
} |
|
static av_cold int decode_init(AVCodecContext *avctx) |
{ |
avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
|
return 0; |
} |
|
AVCodec ff_xl_decoder = { |
.name = "xl", |
.long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_VIXL, |
.init = decode_init, |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |