GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/avrndec.c Lines: 0 76 0.0 %
Date: 2019-11-18 18:00:01 Branches: 0 44 0.0 %

Line Branch Exec Source
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/*
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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 "internal.h"
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#include "mjpeg.h"
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#include "mjpegdec.h"
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#include "libavutil/imgutils.h"
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typedef struct {
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    AVCodecContext *mjpeg_avctx;
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    int is_mjpeg;
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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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    // 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 && avctx->lowres) {
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        av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n");
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        return AVERROR(EINVAL);
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    }
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    if(a->is_mjpeg) {
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        AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
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        AVDictionary *thread_opt = NULL;
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        if (!codec) {
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            av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
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            return AVERROR_DECODER_NOT_FOUND;
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        }
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        a->mjpeg_avctx = avcodec_alloc_context3(codec);
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        av_dict_set(&thread_opt, "threads", "1", 0); // Is this needed ?
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        a->mjpeg_avctx->refcounted_frames = 1;
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        a->mjpeg_avctx->flags = avctx->flags;
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        a->mjpeg_avctx->idct_algo = avctx->idct_algo;
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        a->mjpeg_avctx->lowres = avctx->lowres;
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        a->mjpeg_avctx->width = avctx->width;
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        a->mjpeg_avctx->height = avctx->height;
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        if ((ret = ff_codec_open2_recursive(a->mjpeg_avctx, codec, &thread_opt)) < 0) {
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            av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
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        }
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        av_dict_free(&thread_opt);
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        return ret;
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    }
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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 av_cold int end(AVCodecContext *avctx)
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{
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    AVRnContext *a = avctx->priv_data;
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    avcodec_close(a->mjpeg_avctx);
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    av_freep(&a->mjpeg_avctx);
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    return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data,
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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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    AVFrame *p = 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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    if(a->is_mjpeg) {
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        ret = avcodec_decode_video2(a->mjpeg_avctx, data, got_frame, avpkt);
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        if (ret >= 0 && *got_frame && avctx->width <= p->width && avctx->height <= p->height) {
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            int shift = p->height - avctx->height;
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            int subsample_h, subsample_v;
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            av_pix_fmt_get_chroma_sub_sample(p->format, &subsample_h, &subsample_v);
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            p->data[0] += p->linesize[0] * shift;
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            if (p->data[2]) {
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                p->data[1] += p->linesize[1] * (shift>>subsample_v);
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                p->data[2] += p->linesize[2] * (shift>>subsample_v);
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            }
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            p->width  = avctx->width;
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            p->height = avctx->height;
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        }
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        avctx->pix_fmt = a->mjpeg_avctx->pix_fmt;
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        return ret;
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    }
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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->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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    *got_frame      = 1;
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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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    .long_name      = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
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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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    .max_lowres     = 3,
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
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};