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122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/*
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* Forward Uncompressed
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*
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "libavutil/intreadwrite.h"
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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if (avctx->width & 1) {
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av_log(avctx, AV_LOG_ERROR, "FRWU needs even width\n");
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return -1;
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}
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avctx->pix_fmt = PIX_FMT_UYVY422;
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avctx->coded_frame = avcodec_alloc_frame();
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt)
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{
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int field;
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AVFrame *pic = avctx->coded_frame;
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = buf + avpkt->size;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
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av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
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return -1;
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}
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if (bytestream_get_le32(&buf) != AV_RL32("FRW1")) {
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av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
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return -1;
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}
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pic->reference = 0;
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if (avctx->get_buffer(avctx, pic) < 0)
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return -1;
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pic->pict_type = AV_PICTURE_TYPE_I;
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pic->key_frame = 1;
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pic->interlaced_frame = 1;
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pic->top_field_first = 1;
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for (field = 0; field < 2; field++) {
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int i;
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int field_h = (avctx->height + !field) >> 1;
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int field_size, min_field_size = avctx->width * 2 * field_h;
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uint8_t *dst = pic->data[0];
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if (buf_end - buf < 8)
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return -1;
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buf += 4; // flags? 0x80 == bottom field maybe?
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field_size = bytestream_get_le32(&buf);
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if (field_size < min_field_size) {
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av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
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return -1;
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}
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if (buf_end - buf < field_size) {
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av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
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return -1;
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}
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if (field)
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dst += pic->linesize[0];
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for (i = 0; i < field_h; i++) {
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memcpy(dst, buf, avctx->width * 2);
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buf += avctx->width * 2;
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dst += pic->linesize[0] << 1;
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}
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buf += field_size - min_field_size;
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = *pic;
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return avpkt->size;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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AVFrame *pic = avctx->coded_frame;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_frwu_decoder = {
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.name = "FRWU",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_FRWU,
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.init = decode_init,
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.close = decode_close,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
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};
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