LCOV - code coverage report
Current view: top level - libavcodec - frwu.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 34 48 70.8 %
Date: 2017-12-16 21:16:39 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Forward Uncompressed
       3             :  *
       4             :  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #include "avcodec.h"
      24             : #include "bytestream.h"
      25             : #include "internal.h"
      26             : #include "libavutil/opt.h"
      27             : 
      28             : typedef struct {
      29             :     AVClass *av_class;
      30             :     int change_field_order;
      31             : } FRWUContext;
      32             : 
      33           2 : static av_cold int decode_init(AVCodecContext *avctx)
      34             : {
      35           2 :     if (avctx->width & 1) {
      36           0 :         av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n");
      37           0 :         return AVERROR(EINVAL);
      38             :     }
      39           2 :     avctx->pix_fmt = AV_PIX_FMT_UYVY422;
      40             : 
      41           2 :     return 0;
      42             : }
      43             : 
      44          10 : static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
      45             :                         AVPacket *avpkt)
      46             : {
      47          10 :     FRWUContext *s = avctx->priv_data;
      48             :     int field, ret;
      49          10 :     AVFrame *pic = data;
      50          10 :     const uint8_t *buf = avpkt->data;
      51          10 :     const uint8_t *buf_end = buf + avpkt->size;
      52             : 
      53          10 :     if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
      54           0 :         av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
      55           0 :         return AVERROR_INVALIDDATA;
      56             :     }
      57          10 :     if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
      58           0 :         av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
      59           0 :         return AVERROR_INVALIDDATA;
      60             :     }
      61             : 
      62          10 :     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
      63           0 :         return ret;
      64             : 
      65          10 :     pic->pict_type = AV_PICTURE_TYPE_I;
      66          10 :     pic->key_frame = 1;
      67             : 
      68          30 :     for (field = 0; field < 2; field++) {
      69             :         int i;
      70          20 :         int field_h = (avctx->height + !field) >> 1;
      71          20 :         int field_size, min_field_size = avctx->width * 2 * field_h;
      72          20 :         uint8_t *dst = pic->data[0];
      73          20 :         if (buf_end - buf < 8)
      74           0 :             return AVERROR_INVALIDDATA;
      75          20 :         buf += 4; // flags? 0x80 == bottom field maybe?
      76          20 :         field_size = bytestream_get_le32(&buf);
      77          20 :         if (field_size < min_field_size) {
      78           0 :             av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
      79           0 :             return AVERROR_INVALIDDATA;
      80             :         }
      81          20 :         if (buf_end - buf < field_size) {
      82           0 :             av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
      83           0 :             return AVERROR_INVALIDDATA;
      84             :         }
      85          20 :         if (field ^ s->change_field_order) {
      86          10 :             dst += pic->linesize[0];
      87          10 :         } else if (s->change_field_order) {
      88           0 :             dst += 2 * pic->linesize[0];
      89             :         }
      90        2420 :         for (i = 0; i < field_h; i++) {
      91        2400 :             if (s->change_field_order && field && i == field_h - 1)
      92           0 :                 dst = pic->data[0];
      93        2400 :             memcpy(dst, buf, avctx->width * 2);
      94        2400 :             buf += avctx->width * 2;
      95        2400 :             dst += pic->linesize[0] << 1;
      96             :         }
      97          20 :         buf += field_size - min_field_size;
      98             :     }
      99             : 
     100          10 :     *got_frame = 1;
     101             : 
     102          10 :     return avpkt->size;
     103             : }
     104             : 
     105             : static const AVOption frwu_options[] = {
     106             :     {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), AV_OPT_TYPE_BOOL,
     107             :      {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM},
     108             :     {NULL}
     109             : };
     110             : 
     111             : static const AVClass frwu_class = {
     112             :     .class_name = "frwu Decoder",
     113             :     .item_name  = av_default_item_name,
     114             :     .option     = frwu_options,
     115             :     .version    = LIBAVUTIL_VERSION_INT,
     116             : };
     117             : 
     118             : AVCodec ff_frwu_decoder = {
     119             :     .name           = "frwu",
     120             :     .long_name      = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
     121             :     .type           = AVMEDIA_TYPE_VIDEO,
     122             :     .id             = AV_CODEC_ID_FRWU,
     123             :     .priv_data_size = sizeof(FRWUContext),
     124             :     .init           = decode_init,
     125             :     .decode         = decode_frame,
     126             :     .capabilities   = AV_CODEC_CAP_DR1,
     127             :     .priv_class     = &frwu_class,
     128             : };

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