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https://github.com/FFmpeg/FFmpeg.git
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b119133136
Fixes division by 0 Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
134 lines
3.9 KiB
C
134 lines
3.9 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 "mjpeg.h"
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#include "mjpegdec.h"
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typedef struct {
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MJpegDecodeContext mjpeg_ctx;
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AVFrame frame;
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int is_mjpeg;
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int interlace; //FIXME use frame.interlaced_frame
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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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// Support "Resolution 1:1" for Avid AVI Codec
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a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3);
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if(a->is_mjpeg)
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return ff_mjpeg_decode_init(avctx);
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if(avctx->width <= 0 || avctx->height <= 0)
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return AVERROR_INVALIDDATA;
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avcodec_get_frame_defaults(&a->frame);
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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 av_cold int end(AVCodecContext *avctx)
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{
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AVRnContext *a = avctx->priv_data;
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AVFrame *p = &a->frame;
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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if(a->is_mjpeg)
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ff_mjpeg_decode_end(avctx);
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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, AVPacket *avpkt)
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{
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AVRnContext *a = avctx->priv_data;
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AVFrame *p = &a->frame;
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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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if(a->is_mjpeg)
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return ff_mjpeg_decode_frame(avctx, data, data_size, avpkt);
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true_height = buf_size / (2*avctx->width);
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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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 = avctx->get_buffer(avctx, p)) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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p->pict_type= AV_PICTURE_TYPE_I;
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p->key_frame= 1;
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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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*(AVFrame*)data = a->frame;
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*data_size = sizeof(AVFrame);
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return buf_size;
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}
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AVCodec ff_avrn_decoder = {
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.name = "avrn",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_AVRN,
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.priv_data_size = sizeof(AVRnContext),
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.init = init,
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.close = end,
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.decode = decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
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.capabilities = CODEC_CAP_DR1,
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};
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