0,0 → 1,128 |
/* |
* 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 "internal.h" |
#include "libavutil/opt.h" |
|
typedef struct { |
AVClass *av_class; |
int change_field_order; |
} FRWUContext; |
|
static av_cold int decode_init(AVCodecContext *avctx) |
{ |
if (avctx->width & 1) { |
av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); |
return AVERROR(EINVAL); |
} |
avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
|
return 0; |
} |
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
FRWUContext *s = avctx->priv_data; |
int field, ret; |
AVFrame *pic = data; |
const uint8_t *buf = avpkt->data; |
const uint8_t *buf_end = buf + avpkt->size; |
|
if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { |
av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); |
return AVERROR_INVALIDDATA; |
} |
if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) { |
av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); |
return AVERROR_INVALIDDATA; |
} |
|
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
return ret; |
|
pic->pict_type = AV_PICTURE_TYPE_I; |
pic->key_frame = 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 AVERROR_INVALIDDATA; |
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 AVERROR_INVALIDDATA; |
} |
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 AVERROR_INVALIDDATA; |
} |
if (field ^ s->change_field_order) { |
dst += pic->linesize[0]; |
} else if (s->change_field_order) { |
dst += 2 * pic->linesize[0]; |
} |
for (i = 0; i < field_h; i++) { |
if (s->change_field_order && field && i == field_h - 1) |
dst = pic->data[0]; |
memcpy(dst, buf, avctx->width * 2); |
buf += avctx->width * 2; |
dst += pic->linesize[0] << 1; |
} |
buf += field_size - min_field_size; |
} |
|
*got_frame = 1; |
|
return avpkt->size; |
} |
|
static const AVOption frwu_options[] = { |
{"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), FF_OPT_TYPE_INT, |
{.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM}, |
{NULL} |
}; |
|
static const AVClass frwu_class = { |
.class_name = "frwu Decoder", |
.item_name = av_default_item_name, |
.option = frwu_options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
|
AVCodec ff_frwu_decoder = { |
.name = "frwu", |
.long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_FRWU, |
.priv_data_size = sizeof(FRWUContext), |
.init = decode_init, |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1, |
.priv_class = &frwu_class, |
}; |