mirror of
https://github.com/librempeg/librempeg
synced 2024-11-22 09:02:20 +00:00
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*
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* AVRn decoder
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* Copyright (c) 2012 Michael Niedermayer
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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 "codec_internal.h"
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#include "decode.h"
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#include "libavutil/imgutils.h"
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typedef struct {
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int interlace;
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int tff;
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} AVRnContext;
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static av_cold int init(AVCodecContext *avctx)
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{
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AVRnContext *a = avctx->priv_data;
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int ret;
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if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
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return ret;
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avctx->pix_fmt = AV_PIX_FMT_UYVY422;
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if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
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int ndx = avctx->extradata[4] + 4;
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a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
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if(a->interlace) {
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a->tff = avctx->extradata[ndx + 24] == 1;
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}
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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AVRnContext *a = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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int y, ret, true_height;
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true_height = buf_size / (2*avctx->width);
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if(buf_size < 2*avctx->width * avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type= AV_PICTURE_TYPE_I;
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p->flags |= AV_FRAME_FLAG_KEY;
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if(a->interlace) {
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buf += (true_height - avctx->height)*avctx->width;
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for(y = 0; y < avctx->height-1; y+=2) {
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memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
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memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
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buf += 2*avctx->width;
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}
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} else {
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buf += (true_height - avctx->height)*avctx->width*2;
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for(y = 0; y < avctx->height; y++) {
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memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
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buf += 2*avctx->width;
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}
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}
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*got_frame = 1;
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return buf_size;
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}
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const FFCodec ff_avrn_decoder = {
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.p.name = "avrn",
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CODEC_LONG_NAME("Avid AVI Codec"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_AVRN,
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.priv_data_size = sizeof(AVRnContext),
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.init = 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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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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};
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