LCOV - code coverage report
Current view: top level - libavcodec - noise_bsf.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 29 0.0 %
Date: 2017-12-12 03:56:30 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 *out)
      39             : {
      40           0 :     NoiseContext *s = ctx->priv_data;
      41             :     AVPacket *in;
      42           0 :     int amount = s->amount > 0 ? s->amount : (s->state % 10001 + 1);
      43           0 :     int i, ret = 0;
      44             : 
      45           0 :     if (amount <= 0)
      46           0 :         return AVERROR(EINVAL);
      47             : 
      48           0 :     ret = ff_bsf_get_packet(ctx, &in);
      49           0 :     if (ret < 0)
      50           0 :         return ret;
      51             : 
      52           0 :     if (s->dropamount > 0 && s->state % s->dropamount == 0) {
      53           0 :         s->state++;
      54           0 :         av_packet_free(&in);
      55           0 :         return AVERROR(EAGAIN);
      56             :     }
      57             : 
      58           0 :     ret = av_new_packet(out, in->size);
      59           0 :     if (ret < 0)
      60           0 :         goto fail;
      61             : 
      62           0 :     ret = av_packet_copy_props(out, in);
      63           0 :     if (ret < 0)
      64           0 :         goto fail;
      65             : 
      66           0 :     memcpy(out->data, in->data, in->size);
      67             : 
      68           0 :     for (i = 0; i < out->size; i++) {
      69           0 :         s->state += out->data[i] + 1;
      70           0 :         if (s->state % amount == 0)
      71           0 :             out->data[i] = s->state;
      72             :     }
      73           0 : fail:
      74           0 :     if (ret < 0)
      75           0 :         av_packet_unref(out);
      76           0 :     av_packet_free(&in);
      77           0 :     return ret;
      78             : }
      79             : 
      80             : #define OFFSET(x) offsetof(NoiseContext, x)
      81             : static const AVOption options[] = {
      82             :     { "amount", NULL, OFFSET(amount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX },
      83             :     { "dropamount", NULL, OFFSET(dropamount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX },
      84             :     { NULL },
      85             : };
      86             : 
      87             : static const AVClass noise_class = {
      88             :     .class_name = "noise",
      89             :     .item_name  = av_default_item_name,
      90             :     .option     = options,
      91             :     .version    = LIBAVUTIL_VERSION_INT,
      92             : };
      93             : 
      94             : const AVBitStreamFilter ff_noise_bsf = {
      95             :     .name           = "noise",
      96             :     .priv_data_size = sizeof(NoiseContext),
      97             :     .priv_class     = &noise_class,
      98             :     .filter         = noise,
      99             : };

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