yading@10: /*
yading@10:  * Forward Uncompressed
yading@10:  *
yading@10:  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/opt.h"
yading@10: 
yading@10: typedef struct {
yading@10:     AVClass *av_class;
yading@10:     int change_field_order;
yading@10: } FRWUContext;
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     if (avctx->width & 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     avctx->pix_fmt = AV_PIX_FMT_UYVY422;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     FRWUContext *s = avctx->priv_data;
yading@10:     int field, ret;
yading@10:     AVFrame *pic = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     const uint8_t *buf_end = buf + avpkt->size;
yading@10: 
yading@10:     if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     pic->pict_type = AV_PICTURE_TYPE_I;
yading@10:     pic->key_frame = 1;
yading@10: 
yading@10:     for (field = 0; field < 2; field++) {
yading@10:         int i;
yading@10:         int field_h = (avctx->height + !field) >> 1;
yading@10:         int field_size, min_field_size = avctx->width * 2 * field_h;
yading@10:         uint8_t *dst = pic->data[0];
yading@10:         if (buf_end - buf < 8)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         buf += 4; // flags? 0x80 == bottom field maybe?
yading@10:         field_size = bytestream_get_le32(&buf);
yading@10:         if (field_size < min_field_size) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if (buf_end - buf < field_size) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if (field ^ s->change_field_order) {
yading@10:             dst += pic->linesize[0];
yading@10:         } else if (s->change_field_order) {
yading@10:             dst += 2 * pic->linesize[0];
yading@10:         }
yading@10:         for (i = 0; i < field_h; i++) {
yading@10:             if (s->change_field_order && field && i == field_h - 1)
yading@10:                 dst = pic->data[0];
yading@10:             memcpy(dst, buf, avctx->width * 2);
yading@10:             buf += avctx->width * 2;
yading@10:             dst += pic->linesize[0] << 1;
yading@10:         }
yading@10:         buf += field_size - min_field_size;
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: static const AVOption frwu_options[] = {
yading@10:     {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), FF_OPT_TYPE_INT,
yading@10:      {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM},
yading@10:     {NULL}
yading@10: };
yading@10: 
yading@10: static const AVClass frwu_class = {
yading@10:     .class_name = "frwu Decoder",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = frwu_options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVCodec ff_frwu_decoder = {
yading@10:     .name           = "frwu",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_FRWU,
yading@10:     .priv_data_size = sizeof(FRWUContext),
yading@10:     .init           = decode_init,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
yading@10:     .priv_class     = &frwu_class,
yading@10: };