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a5e8c41c28
It is not used in any filters currently and is inherently evil. If passing binary data to filters is required in the future, it should be done with some AVOptions-based system.
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "avfilter.h"
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#include "internal.h"
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#include "libavutil/audioconvert.h"
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typedef struct {
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uint64_t channel_layout;
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int64_t sample_rate;
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} ANullContext;
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static int init(AVFilterContext *ctx, const char *args)
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{
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ANullContext *priv = ctx->priv;
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char channel_layout_str[128] = "";
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priv->sample_rate = 44100;
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priv->channel_layout = AV_CH_LAYOUT_STEREO;
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if (args)
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sscanf(args, "%"PRId64":%s", &priv->sample_rate, channel_layout_str);
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if (priv->sample_rate < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid negative sample rate: %"PRId64"\n", priv->sample_rate);
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return AVERROR(EINVAL);
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}
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if (*channel_layout_str)
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if (!(priv->channel_layout = av_get_channel_layout(channel_layout_str))
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&& sscanf(channel_layout_str, "%"PRId64, &priv->channel_layout) != 1) {
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av_log(ctx, AV_LOG_ERROR, "Invalid value '%s' for channel layout\n",
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channel_layout_str);
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return AVERROR(EINVAL);
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}
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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 *priv = outlink->src->priv;
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char buf[128];
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int chans_nb;
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outlink->sample_rate = priv->sample_rate;
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outlink->channel_layout = priv->channel_layout;
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chans_nb = av_get_channel_layout_nb_channels(priv->channel_layout);
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av_get_channel_layout_string(buf, sizeof(buf), chans_nb, priv->channel_layout);
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av_log(outlink->src, AV_LOG_INFO,
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"sample_rate:%"PRId64 " channel_layout:%"PRId64 " channel_layout_description:'%s'\n",
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priv->sample_rate, priv->channel_layout, buf);
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return 0;
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}
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static int request_frame(AVFilterLink *link)
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{
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return -1;
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}
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AVFilter avfilter_asrc_anullsrc = {
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.name = "anullsrc",
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.description = NULL_IF_CONFIG_SMALL("Null audio source, never return audio frames."),
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.init = init,
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.priv_size = sizeof(ANullContext),
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.inputs = (AVFilterPad[]) {{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .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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{ .name = NULL}},
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};
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