LCOV - code coverage report
Current view: top level - libavcodec - avrndec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 76 0.0 %
Date: 2017-12-10 21:22:29 Functions: 0 3 0.0 %

          Line data    Source code
       1             : /*
       2             :  * AVRn decoder
       3             :  * Copyright (c) 2012 Michael Niedermayer
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "avcodec.h"
      23             : #include "internal.h"
      24             : #include "mjpeg.h"
      25             : #include "mjpegdec.h"
      26             : #include "libavutil/imgutils.h"
      27             : 
      28             : typedef struct {
      29             :     AVCodecContext *mjpeg_avctx;
      30             :     int is_mjpeg;
      31             :     int interlace;
      32             :     int tff;
      33             : } AVRnContext;
      34             : 
      35           0 : static av_cold int init(AVCodecContext *avctx)
      36             : {
      37           0 :     AVRnContext *a = avctx->priv_data;
      38             :     int ret;
      39             : 
      40             :     // Support "Resolution 1:1" for Avid AVI Codec
      41           0 :     a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3);
      42             : 
      43           0 :     if(!a->is_mjpeg && avctx->lowres) {
      44           0 :         av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n");
      45           0 :         return AVERROR(EINVAL);
      46             :     }
      47             : 
      48           0 :     if(a->is_mjpeg) {
      49           0 :         AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
      50           0 :         AVDictionary *thread_opt = NULL;
      51           0 :         if (!codec) {
      52           0 :             av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
      53           0 :             return AVERROR_DECODER_NOT_FOUND;
      54             :         }
      55             : 
      56           0 :         a->mjpeg_avctx = avcodec_alloc_context3(codec);
      57             : 
      58           0 :         av_dict_set(&thread_opt, "threads", "1", 0); // Is this needed ?
      59           0 :         a->mjpeg_avctx->refcounted_frames = 1;
      60           0 :         a->mjpeg_avctx->flags = avctx->flags;
      61           0 :         a->mjpeg_avctx->idct_algo = avctx->idct_algo;
      62           0 :         a->mjpeg_avctx->lowres = avctx->lowres;
      63           0 :         a->mjpeg_avctx->width = avctx->width;
      64           0 :         a->mjpeg_avctx->height = avctx->height;
      65             : 
      66           0 :         if ((ret = ff_codec_open2_recursive(a->mjpeg_avctx, codec, &thread_opt)) < 0) {
      67           0 :             av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
      68             :         }
      69           0 :         av_dict_free(&thread_opt);
      70             : 
      71           0 :         return ret;
      72             :     }
      73             : 
      74           0 :     if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
      75           0 :         return ret;
      76             : 
      77           0 :     avctx->pix_fmt = AV_PIX_FMT_UYVY422;
      78             : 
      79           0 :     if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
      80           0 :         int ndx = avctx->extradata[4] + 4;
      81           0 :         a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
      82           0 :         if(a->interlace) {
      83           0 :             a->tff = avctx->extradata[ndx + 24] == 1;
      84             :         }
      85             :     }
      86             : 
      87           0 :     return 0;
      88             : }
      89             : 
      90           0 : static av_cold int end(AVCodecContext *avctx)
      91             : {
      92           0 :     AVRnContext *a = avctx->priv_data;
      93             : 
      94           0 :     avcodec_close(a->mjpeg_avctx);
      95           0 :     av_freep(&a->mjpeg_avctx);
      96             : 
      97           0 :     return 0;
      98             : }
      99             : 
     100           0 : static int decode_frame(AVCodecContext *avctx, void *data,
     101             :                         int *got_frame, AVPacket *avpkt)
     102             : {
     103           0 :     AVRnContext *a = avctx->priv_data;
     104           0 :     AVFrame *p = data;
     105           0 :     const uint8_t *buf = avpkt->data;
     106           0 :     int buf_size       = avpkt->size;
     107             :     int y, ret, true_height;
     108             : 
     109           0 :     if(a->is_mjpeg) {
     110           0 :         ret = avcodec_decode_video2(a->mjpeg_avctx, data, got_frame, avpkt);
     111             : 
     112           0 :         if (ret >= 0 && *got_frame && avctx->width <= p->width && avctx->height <= p->height) {
     113           0 :             int shift = p->height - avctx->height;
     114             :             int subsample_h, subsample_v;
     115             : 
     116           0 :             av_pix_fmt_get_chroma_sub_sample(p->format, &subsample_h, &subsample_v);
     117             : 
     118           0 :             p->data[0] += p->linesize[0] * shift;
     119           0 :             if (p->data[2]) {
     120           0 :                 p->data[1] += p->linesize[1] * (shift>>subsample_v);
     121           0 :                 p->data[2] += p->linesize[2] * (shift>>subsample_v);
     122             :             }
     123             : 
     124           0 :             p->width  = avctx->width;
     125           0 :             p->height = avctx->height;
     126             :         }
     127           0 :         avctx->pix_fmt = a->mjpeg_avctx->pix_fmt;
     128           0 :         return ret;
     129             :     }
     130             : 
     131           0 :     true_height    = buf_size / (2*avctx->width);
     132             : 
     133           0 :     if(buf_size < 2*avctx->width * avctx->height) {
     134           0 :         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
     135           0 :         return AVERROR_INVALIDDATA;
     136             :     }
     137             : 
     138           0 :     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
     139           0 :         return ret;
     140           0 :     p->pict_type= AV_PICTURE_TYPE_I;
     141           0 :     p->key_frame= 1;
     142             : 
     143           0 :     if(a->interlace) {
     144           0 :         buf += (true_height - avctx->height)*avctx->width;
     145           0 :         for(y = 0; y < avctx->height-1; y+=2) {
     146           0 :             memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf                             , 2*avctx->width);
     147           0 :             memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
     148           0 :             buf += 2*avctx->width;
     149             :         }
     150             :     } else {
     151           0 :         buf += (true_height - avctx->height)*avctx->width*2;
     152           0 :         for(y = 0; y < avctx->height; y++) {
     153           0 :             memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
     154           0 :             buf += 2*avctx->width;
     155             :         }
     156             :     }
     157             : 
     158           0 :     *got_frame      = 1;
     159           0 :     return buf_size;
     160             : }
     161             : 
     162             : AVCodec ff_avrn_decoder = {
     163             :     .name           = "avrn",
     164             :     .long_name      = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
     165             :     .type           = AVMEDIA_TYPE_VIDEO,
     166             :     .id             = AV_CODEC_ID_AVRN,
     167             :     .priv_data_size = sizeof(AVRnContext),
     168             :     .init           = init,
     169             :     .close          = end,
     170             :     .decode         = decode_frame,
     171             :     .max_lowres     = 3,
     172             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     173             : };

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