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ffmpeg / libavcodec / frwu.c @ 2912e87a

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/*
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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 = FF_I_TYPE;
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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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    "FRWU",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_FRWU,
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    0,
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    decode_init,
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    NULL,
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    decode_close,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
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};