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ffmpeg/libavcodec/frwu.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

124 lines
3.5 KiB
C

/*
* Forward Uncompressed
*
* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
* 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
*/
#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 = FF_I_TYPE;
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 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"),
};