mirror of https://git.ffmpeg.org/ffmpeg.git
129 lines
4.1 KiB
C
129 lines
4.1 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "codec_internal.h"
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#include "decode.h"
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#include "libavutil/opt.h"
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typedef struct {
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AVClass *av_class;
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int change_field_order;
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} FRWUContext;
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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 AVERROR(EINVAL);
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}
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avctx->pix_fmt = AV_PIX_FMT_UYVY422;
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, AVFrame *pic,
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int *got_frame, AVPacket *avpkt)
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{
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FRWUContext *s = avctx->priv_data;
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int field, ret;
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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 (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 AVERROR_INVALIDDATA;
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}
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if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
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av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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pic->pict_type = AV_PICTURE_TYPE_I;
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pic->key_frame = 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 AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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}
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if (field ^ s->change_field_order) {
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dst += pic->linesize[0];
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} else if (s->change_field_order) {
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dst += 2 * pic->linesize[0];
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}
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for (i = 0; i < field_h; i++) {
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if (s->change_field_order && field && i == field_h - 1)
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dst = pic->data[0];
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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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*got_frame = 1;
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return avpkt->size;
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}
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static const AVOption frwu_options[] = {
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{"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), AV_OPT_TYPE_BOOL,
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{.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM},
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{NULL}
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};
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static const AVClass frwu_class = {
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.class_name = "frwu Decoder",
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.item_name = av_default_item_name,
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.option = frwu_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const FFCodec ff_frwu_decoder = {
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.p.name = "frwu",
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CODEC_LONG_NAME("Forward Uncompressed"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_FRWU,
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.priv_data_size = sizeof(FRWUContext),
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.init = decode_init,
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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.p.priv_class = &frwu_class,
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};
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