GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/asrc_anullsrc.c Lines: 0 36 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 20 0.0 %

Line Branch Exec Source
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/*
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 * Copyright 2010 S.N. Hemanth Meenakshisundaram <smeenaks ucsd edu>
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 * Copyright 2010 Stefano Sabatini <stefano.sabatini-lala poste it>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * null audio source
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 */
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#include <inttypes.h>
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#include <stdio.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "internal.h"
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typedef struct ANullContext {
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    const AVClass *class;
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    char   *channel_layout_str;
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    uint64_t channel_layout;
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    char   *sample_rate_str;
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    int     sample_rate;
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    int64_t duration;
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    int nb_samples;             ///< number of samples per requested frame
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    int64_t pts;
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} ANullContext;
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#define OFFSET(x) offsetof(ANullContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption anullsrc_options[]= {
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    { "channel_layout", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
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    { "cl",             "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
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    { "sample_rate",    "set sample rate",    OFFSET(sample_rate_str)   , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
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    { "r",              "set sample rate",    OFFSET(sample_rate_str)   , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
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    { "nb_samples",     "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, UINT16_MAX, FLAGS },
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    { "n",              "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, UINT16_MAX, FLAGS },
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    { "duration",       "set the audio duration",                        OFFSET(duration),   AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
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    { "d",              "set the audio duration",                        OFFSET(duration),   AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(anullsrc);
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static av_cold int init(AVFilterContext *ctx)
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{
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    ANullContext *null = ctx->priv;
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    int ret;
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    if ((ret = ff_parse_sample_rate(&null->sample_rate,
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                                     null->sample_rate_str, ctx)) < 0)
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        return ret;
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    if ((ret = ff_parse_channel_layout(&null->channel_layout, NULL,
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                                        null->channel_layout_str, ctx)) < 0)
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        return ret;
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    return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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    ANullContext *null = ctx->priv;
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    int64_t chlayouts[] = { null->channel_layout, -1 };
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    int sample_rates[] = { null->sample_rate, -1 };
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    int ret;
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    if ((ret = ff_set_common_formats         (ctx, ff_all_formats              (AVMEDIA_TYPE_AUDIO))) < 0 ||
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        (ret = ff_set_common_samplerates     (ctx, ff_make_format_list         (sample_rates      ))) < 0)
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        return ret;
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    return ff_set_common_channel_layouts(ctx, ff_make_format64_list(chlayouts));
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}
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static av_cold int config_props(AVFilterLink *outlink)
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{
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    ANullContext *null = outlink->src->priv;
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    if (null->duration >= 0)
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        null->duration = av_rescale(null->duration, null->sample_rate, AV_TIME_BASE);
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    return 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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    ANullContext *null = ctx->priv;
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    AVFilterLink *outlink = ctx->outputs[0];
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    if (null->duration >= 0 && null->pts >= null->duration) {
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        ff_outlink_set_status(outlink, AVERROR_EOF, null->pts);
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        return 0;
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    }
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    if (ff_outlink_frame_wanted(outlink)) {
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        AVFrame *samplesref = ff_get_audio_buffer(outlink, null->duration >= 0 ? FFMIN(null->nb_samples, null->duration - null->pts) : null->nb_samples);
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        if (!samplesref)
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            return AVERROR(ENOMEM);
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        samplesref->pts = null->pts;
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        null->pts += samplesref->nb_samples;
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        return ff_filter_frame(outlink, samplesref);
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    }
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    return FFERROR_NOT_READY;
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}
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static const AVFilterPad avfilter_asrc_anullsrc_outputs[] = {
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    {
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        .name          = "default",
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        .type          = AVMEDIA_TYPE_AUDIO,
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        .config_props  = config_props,
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    },
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    { NULL }
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};
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AVFilter ff_asrc_anullsrc = {
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    .name          = "anullsrc",
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    .description   = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),
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    .init          = init,
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    .query_formats = query_formats,
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    .priv_size     = sizeof(ANullContext),
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    .inputs        = NULL,
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    .outputs       = avfilter_asrc_anullsrc_outputs,
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    .activate      = activate,
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    .priv_class    = &anullsrc_class,
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};