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![Ganesh Ajjanagadde](/assets/img/avatar_default.png)
Many of the functions from avfilter/formats can return errors, usually AVERROR(ENOMEM). This propagates the return values. All of these were found by using av_warn_unused_result, demonstrating its utility. Tested with FATE. I am least sure of the changes to avfilter/filtergraph, since I don't know what/how reduce_format is intended to behave and how it should react to errors. Fixes: CID 1325680, 1325679, 1325678. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Previous version Reviewed-by: Nicolas George <george@nsup.org> Previous version Reviewed-by: Clément Bœsch <u@pkh.me> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
149 lines
4.9 KiB
C
149 lines
4.9 KiB
C
/*
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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 "internal.h"
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typedef struct {
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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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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}, 0, INT_MAX, FLAGS },
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{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_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_channel_layouts (ctx, avfilter_make_format64_list (chlayouts ))) < 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 0;
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}
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static int config_props(AVFilterLink *outlink)
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{
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ANullContext *null = outlink->src->priv;
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char buf[128];
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av_get_channel_layout_string(buf, sizeof(buf), 0, null->channel_layout);
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av_log(outlink->src, AV_LOG_VERBOSE,
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"sample_rate:%d channel_layout:'%s' nb_samples:%d\n",
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null->sample_rate, buf, null->nb_samples);
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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int ret;
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ANullContext *null = outlink->src->priv;
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AVFrame *samplesref;
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samplesref = ff_get_audio_buffer(outlink, 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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samplesref->channel_layout = null->channel_layout;
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samplesref->sample_rate = outlink->sample_rate;
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ret = ff_filter_frame(outlink, av_frame_clone(samplesref));
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av_frame_free(&samplesref);
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if (ret < 0)
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return ret;
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null->pts += null->nb_samples;
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return ret;
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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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.request_frame = request_frame,
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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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.priv_class = &anullsrc_class,
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};
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