mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/*
|
|
* Miro VideoXL codec
|
|
* Copyright (c) 2004 Konstantin Shishkov
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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/intreadwrite.h"
|
|
#include "avcodec.h"
|
|
|
|
typedef struct VideoXLContext{
|
|
AVCodecContext *avctx;
|
|
AVFrame pic;
|
|
} VideoXLContext;
|
|
|
|
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 *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
VideoXLContext * const a = avctx->priv_data;
|
|
AVFrame * const p= (AVFrame*)&a->pic;
|
|
uint8_t *Y, *U, *V;
|
|
int i, j;
|
|
int stride;
|
|
uint32_t val;
|
|
int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
|
|
|
|
if(p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
p->reference = 0;
|
|
if(avctx->get_buffer(avctx, p) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
p->pict_type= AV_PICTURE_TYPE_I;
|
|
p->key_frame= 1;
|
|
|
|
Y = a->pic.data[0];
|
|
U = a->pic.data[1];
|
|
V = a->pic.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 += a->pic.linesize[0];
|
|
U += a->pic.linesize[1];
|
|
V += a->pic.linesize[2];
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = a->pic;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx){
|
|
// VideoXLContext * const a = avctx->priv_data;
|
|
|
|
avctx->pix_fmt= PIX_FMT_YUV411P;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx){
|
|
VideoXLContext * const a = avctx->priv_data;
|
|
AVFrame *pic = &a->pic;
|
|
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_xl_decoder = {
|
|
"xl",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_VIXL,
|
|
sizeof(VideoXLContext),
|
|
decode_init,
|
|
NULL,
|
|
decode_end,
|
|
decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
|
|
};
|