LCOV - code coverage report
Current view: top level - libavfilter - asrc_anullsrc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 37 0.0 %
Date: 2017-12-14 08:27:08 Functions: 0 4 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright 2010 S.N. Hemanth Meenakshisundaram <smeenaks ucsd edu>
       3             :  * Copyright 2010 Stefano Sabatini <stefano.sabatini-lala poste it>
       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             : /**
      23             :  * @file
      24             :  * null audio source
      25             :  */
      26             : 
      27             : #include <inttypes.h>
      28             : #include <stdio.h>
      29             : 
      30             : #include "libavutil/channel_layout.h"
      31             : #include "libavutil/internal.h"
      32             : #include "libavutil/opt.h"
      33             : #include "audio.h"
      34             : #include "avfilter.h"
      35             : #include "internal.h"
      36             : 
      37             : typedef struct ANullContext {
      38             :     const AVClass *class;
      39             :     char   *channel_layout_str;
      40             :     uint64_t channel_layout;
      41             :     char   *sample_rate_str;
      42             :     int     sample_rate;
      43             :     int nb_samples;             ///< number of samples per requested frame
      44             :     int64_t pts;
      45             : } ANullContext;
      46             : 
      47             : #define OFFSET(x) offsetof(ANullContext, x)
      48             : #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      49             : 
      50             : static const AVOption anullsrc_options[]= {
      51             :     { "channel_layout", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
      52             :     { "cl",             "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
      53             :     { "sample_rate",    "set sample rate",    OFFSET(sample_rate_str)   , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
      54             :     { "r",              "set sample rate",    OFFSET(sample_rate_str)   , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
      55             :     { "nb_samples",     "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
      56             :     { "n",              "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
      57             :     { NULL }
      58             : };
      59             : 
      60             : AVFILTER_DEFINE_CLASS(anullsrc);
      61             : 
      62           0 : static av_cold int init(AVFilterContext *ctx)
      63             : {
      64           0 :     ANullContext *null = ctx->priv;
      65             :     int ret;
      66             : 
      67           0 :     if ((ret = ff_parse_sample_rate(&null->sample_rate,
      68           0 :                                      null->sample_rate_str, ctx)) < 0)
      69           0 :         return ret;
      70             : 
      71           0 :     if ((ret = ff_parse_channel_layout(&null->channel_layout, NULL,
      72           0 :                                         null->channel_layout_str, ctx)) < 0)
      73           0 :         return ret;
      74             : 
      75           0 :     return 0;
      76             : }
      77             : 
      78           0 : static int query_formats(AVFilterContext *ctx)
      79             : {
      80           0 :     ANullContext *null = ctx->priv;
      81           0 :     int64_t chlayouts[] = { null->channel_layout, -1 };
      82           0 :     int sample_rates[] = { null->sample_rate, -1 };
      83             :     int ret;
      84             : 
      85           0 :     if ((ret = ff_set_common_formats         (ctx, ff_all_formats              (AVMEDIA_TYPE_AUDIO))) < 0 ||
      86           0 :         (ret = ff_set_common_channel_layouts (ctx, avfilter_make_format64_list (chlayouts         ))) < 0 ||
      87           0 :         (ret = ff_set_common_samplerates     (ctx, ff_make_format_list         (sample_rates      ))) < 0)
      88           0 :         return ret;
      89             : 
      90           0 :     return 0;
      91             : }
      92             : 
      93           0 : static int config_props(AVFilterLink *outlink)
      94             : {
      95           0 :     ANullContext *null = outlink->src->priv;
      96             :     char buf[128];
      97             : 
      98           0 :     av_get_channel_layout_string(buf, sizeof(buf), 0, null->channel_layout);
      99           0 :     av_log(outlink->src, AV_LOG_VERBOSE,
     100             :            "sample_rate:%d channel_layout:'%s' nb_samples:%d\n",
     101             :            null->sample_rate, buf, null->nb_samples);
     102             : 
     103           0 :     return 0;
     104             : }
     105             : 
     106           0 : static int request_frame(AVFilterLink *outlink)
     107             : {
     108             :     int ret;
     109           0 :     ANullContext *null = outlink->src->priv;
     110             :     AVFrame *samplesref;
     111             : 
     112           0 :     samplesref = ff_get_audio_buffer(outlink, null->nb_samples);
     113           0 :     if (!samplesref)
     114           0 :         return AVERROR(ENOMEM);
     115             : 
     116           0 :     samplesref->pts = null->pts;
     117           0 :     samplesref->channel_layout = null->channel_layout;
     118           0 :     samplesref->sample_rate = outlink->sample_rate;
     119             : 
     120           0 :     ret = ff_filter_frame(outlink, av_frame_clone(samplesref));
     121           0 :     av_frame_free(&samplesref);
     122           0 :     if (ret < 0)
     123           0 :         return ret;
     124             : 
     125           0 :     null->pts += null->nb_samples;
     126           0 :     return ret;
     127             : }
     128             : 
     129             : static const AVFilterPad avfilter_asrc_anullsrc_outputs[] = {
     130             :     {
     131             :         .name          = "default",
     132             :         .type          = AVMEDIA_TYPE_AUDIO,
     133             :         .config_props  = config_props,
     134             :         .request_frame = request_frame,
     135             :     },
     136             :     { NULL }
     137             : };
     138             : 
     139             : AVFilter ff_asrc_anullsrc = {
     140             :     .name          = "anullsrc",
     141             :     .description   = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),
     142             :     .init          = init,
     143             :     .query_formats = query_formats,
     144             :     .priv_size     = sizeof(ANullContext),
     145             :     .inputs        = NULL,
     146             :     .outputs       = avfilter_asrc_anullsrc_outputs,
     147             :     .priv_class    = &anullsrc_class,
     148             : };

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