mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-30 15:00:29 +00:00
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/*
|
|
* Forward Uncompressed
|
|
*
|
|
* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
if (avctx->width & 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "FRWU needs even width\n");
|
|
return -1;
|
|
}
|
|
avctx->pix_fmt = PIX_FMT_UYVY422;
|
|
|
|
avctx->coded_frame = avcodec_alloc_frame();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
int field;
|
|
AVFrame *pic = avctx->coded_frame;
|
|
const uint8_t *buf = avpkt->data;
|
|
const uint8_t *buf_end = buf + avpkt->size;
|
|
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
|
|
if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
|
|
av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
|
|
return -1;
|
|
}
|
|
if (bytestream_get_le32(&buf) != AV_RL32("FRW1")) {
|
|
av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
|
|
return -1;
|
|
}
|
|
|
|
pic->reference = 0;
|
|
if (avctx->get_buffer(avctx, pic) < 0)
|
|
return -1;
|
|
|
|
pic->pict_type = AV_PICTURE_TYPE_I;
|
|
pic->key_frame = 1;
|
|
pic->interlaced_frame = 1;
|
|
pic->top_field_first = 1;
|
|
|
|
for (field = 0; field < 2; field++) {
|
|
int i;
|
|
int field_h = (avctx->height + !field) >> 1;
|
|
int field_size, min_field_size = avctx->width * 2 * field_h;
|
|
uint8_t *dst = pic->data[0];
|
|
if (buf_end - buf < 8)
|
|
return -1;
|
|
buf += 4; // flags? 0x80 == bottom field maybe?
|
|
field_size = bytestream_get_le32(&buf);
|
|
if (field_size < min_field_size) {
|
|
av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
|
|
return -1;
|
|
}
|
|
if (buf_end - buf < field_size) {
|
|
av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
|
|
return -1;
|
|
}
|
|
if (field)
|
|
dst += pic->linesize[0];
|
|
for (i = 0; i < field_h; i++) {
|
|
memcpy(dst, buf, avctx->width * 2);
|
|
buf += avctx->width * 2;
|
|
dst += pic->linesize[0] << 1;
|
|
}
|
|
buf += field_size - min_field_size;
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = *pic;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
AVFrame *pic = avctx->coded_frame;
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_frwu_decoder = {
|
|
"FRWU",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_FRWU,
|
|
0,
|
|
decode_init,
|
|
NULL,
|
|
decode_close,
|
|
decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
|
|
};
|