/*
- * This file is part of Libav.
+ * Copyright 2010 S.N. Hemanth Meenakshisundaram <smeenaks ucsd edu>
+ * Copyright 2010 Stefano Sabatini <stefano.sabatini-lala poste it>
*
- * Libav is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include <stdio.h>
+#include "audio.h"
#include "avfilter.h"
#include "internal.h"
+
#include "libavutil/audioconvert.h"
#include "libavutil/internal.h"
+#include "libavutil/opt.h"
typedef struct {
+ const AVClass *class;
+ char *channel_layout_str;
uint64_t channel_layout;
- int64_t sample_rate;
+ char *sample_rate_str;
+ int sample_rate;
+ int nb_samples; ///< number of samples per requested frame
+ int64_t pts;
} ANullContext;
+#define OFFSET(x) offsetof(ANullContext, x)
+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption anullsrc_options[]= {
+ { "channel_layout", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
+ { "cl", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
+ { "sample_rate", "set sample rate", OFFSET(sample_rate_str) , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
+ { "r", "set sample rate", OFFSET(sample_rate_str) , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
+ { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
+ { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
+ { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(anullsrc);
+
static int init(AVFilterContext *ctx, const char *args)
{
- ANullContext *priv = ctx->priv;
- char channel_layout_str[128] = "";
+ ANullContext *null = ctx->priv;
+ int ret;
- priv->sample_rate = 44100;
- priv->channel_layout = AV_CH_LAYOUT_STEREO;
+ null->class = &anullsrc_class;
+ av_opt_set_defaults(null);
- if (args)
- sscanf(args, "%"PRId64":%s", &priv->sample_rate, channel_layout_str);
+ if ((ret = (av_set_options_string(null, args, "=", ":"))) < 0)
+ return ret;
- if (priv->sample_rate < 0) {
- av_log(ctx, AV_LOG_ERROR, "Invalid negative sample rate: %"PRId64"\n", priv->sample_rate);
- return AVERROR(EINVAL);
- }
+ if ((ret = ff_parse_sample_rate(&null->sample_rate,
+ null->sample_rate_str, ctx)) < 0)
+ return ret;
- if (*channel_layout_str)
- if (!(priv->channel_layout = av_get_channel_layout(channel_layout_str))
- && sscanf(channel_layout_str, "%"PRId64, &priv->channel_layout) != 1) {
- av_log(ctx, AV_LOG_ERROR, "Invalid value '%s' for channel layout\n",
- channel_layout_str);
- return AVERROR(EINVAL);
- }
+ if ((ret = ff_parse_channel_layout(&null->channel_layout,
+ null->channel_layout_str, ctx)) < 0)
+ return ret;
return 0;
}
static int config_props(AVFilterLink *outlink)
{
- ANullContext *priv = outlink->src->priv;
+ ANullContext *null = outlink->src->priv;
char buf[128];
int chans_nb;
- outlink->sample_rate = priv->sample_rate;
- outlink->channel_layout = priv->channel_layout;
+ outlink->sample_rate = null->sample_rate;
+ outlink->channel_layout = null->channel_layout;
- chans_nb = av_get_channel_layout_nb_channels(priv->channel_layout);
- av_get_channel_layout_string(buf, sizeof(buf), chans_nb, priv->channel_layout);
+ chans_nb = av_get_channel_layout_nb_channels(null->channel_layout);
+ av_get_channel_layout_string(buf, sizeof(buf), chans_nb, null->channel_layout);
av_log(outlink->src, AV_LOG_VERBOSE,
- "sample_rate:%"PRId64 " channel_layout:%"PRId64 " channel_layout_description:'%s'\n",
- priv->sample_rate, priv->channel_layout, buf);
+ "sample_rate:%d channel_layout:'%s' nb_samples:%d\n",
+ null->sample_rate, buf, null->nb_samples);
return 0;
}
-static int request_frame(AVFilterLink *link)
+static int request_frame(AVFilterLink *outlink)
{
- return -1;
+ ANullContext *null = outlink->src->priv;
+ AVFilterBufferRef *samplesref;
+
+ samplesref =
+ ff_get_audio_buffer(outlink, AV_PERM_WRITE, null->nb_samples);
+ samplesref->pts = null->pts;
+ samplesref->pos = -1;
+ samplesref->audio->channel_layout = null->channel_layout;
+ samplesref->audio->sample_rate = outlink->sample_rate;
+
+ ff_filter_samples(outlink, avfilter_ref_buffer(samplesref, ~0));
+ avfilter_unref_buffer(samplesref);
+
+ null->pts += null->nb_samples;
+ return 0;
}
static const AVFilterPad avfilter_asrc_anullsrc_outputs[] = {
AVFilter avfilter_asrc_anullsrc = {
.name = "anullsrc",
- .description = NULL_IF_CONFIG_SMALL("Null audio source, never return audio frames."),
+ .description = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),
.init = init,
.priv_size = sizeof(ANullContext),
.inputs = NULL,
.outputs = avfilter_asrc_anullsrc_outputs,
+ .priv_class = &anullsrc_class,
};
projects / ffmpeg / blobdiff