LCOV - code coverage report
Current view: top level - libavcodec - noise_bsf.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 24 0.0 %
Date: 2018-05-20 11:54:08 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include <stdlib.h>
      22             : #include <string.h>
      23             : 
      24             : #include "avcodec.h"
      25             : #include "bsf.h"
      26             : 
      27             : #include "libavutil/log.h"
      28             : #include "libavutil/mem.h"
      29             : #include "libavutil/opt.h"
      30             : 
      31             : typedef struct NoiseContext {
      32             :     const AVClass *class;
      33             :     int amount;
      34             :     int dropamount;
      35             :     unsigned int state;
      36             : } NoiseContext;
      37             : 
      38           0 : static int noise(AVBSFContext *ctx, AVPacket *pkt)
      39             : {
      40           0 :     NoiseContext *s = ctx->priv_data;
      41           0 :     int amount = s->amount > 0 ? s->amount : (s->state % 10001 + 1);
      42           0 :     int i, ret = 0;
      43             : 
      44           0 :     if (amount <= 0)
      45           0 :         return AVERROR(EINVAL);
      46             : 
      47           0 :     ret = ff_bsf_get_packet_ref(ctx, pkt);
      48           0 :     if (ret < 0)
      49           0 :         return ret;
      50             : 
      51           0 :     if (s->dropamount > 0 && s->state % s->dropamount == 0) {
      52           0 :         s->state++;
      53           0 :         av_packet_unref(pkt);
      54           0 :         return AVERROR(EAGAIN);
      55             :     }
      56             : 
      57           0 :     ret = av_packet_make_writable(pkt);
      58           0 :     if (ret < 0)
      59           0 :         goto fail;
      60             : 
      61           0 :     for (i = 0; i < pkt->size; i++) {
      62           0 :         s->state += pkt->data[i] + 1;
      63           0 :         if (s->state % amount == 0)
      64           0 :             pkt->data[i] = s->state;
      65             :     }
      66           0 : fail:
      67           0 :     if (ret < 0)
      68           0 :         av_packet_unref(pkt);
      69             : 
      70           0 :     return ret;
      71             : }
      72             : 
      73             : #define OFFSET(x) offsetof(NoiseContext, x)
      74             : #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_BSF_PARAM)
      75             : static const AVOption options[] = {
      76             :     { "amount", NULL, OFFSET(amount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
      77             :     { "dropamount", NULL, OFFSET(dropamount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
      78             :     { NULL },
      79             : };
      80             : 
      81             : static const AVClass noise_class = {
      82             :     .class_name = "noise",
      83             :     .item_name  = av_default_item_name,
      84             :     .option     = options,
      85             :     .version    = LIBAVUTIL_VERSION_INT,
      86             : };
      87             : 
      88             : const AVBitStreamFilter ff_noise_bsf = {
      89             :     .name           = "noise",
      90             :     .priv_data_size = sizeof(NoiseContext),
      91             :     .priv_class     = &noise_class,
      92             :     .filter         = noise,
      93             : };

Generated by: LCOV version 1.13