#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
+#include "filters.h"
#include "internal.h"
typedef struct ANullContext {
uint64_t channel_layout;
char *sample_rate_str;
int sample_rate;
+ int64_t duration;
int nb_samples; ///< number of samples per requested frame
int64_t pts;
} ANullContext;
{ "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 },
+ { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, UINT16_MAX, FLAGS },
+ { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, UINT16_MAX, FLAGS },
+ { "duration", "set the audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
+ { "d", "set the audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
{ NULL }
};
int ret;
if ((ret = ff_set_common_formats (ctx, ff_all_formats (AVMEDIA_TYPE_AUDIO))) < 0 ||
- (ret = ff_set_common_channel_layouts (ctx, avfilter_make_format64_list (chlayouts ))) < 0 ||
(ret = ff_set_common_samplerates (ctx, ff_make_format_list (sample_rates ))) < 0)
return ret;
- return 0;
+ return ff_set_common_channel_layouts(ctx, ff_make_format64_list(chlayouts));
}
-static int config_props(AVFilterLink *outlink)
+static av_cold int config_props(AVFilterLink *outlink)
{
ANullContext *null = outlink->src->priv;
- char buf[128];
- av_get_channel_layout_string(buf, sizeof(buf), 0, null->channel_layout);
- av_log(outlink->src, AV_LOG_VERBOSE,
- "sample_rate:%d channel_layout:'%s' nb_samples:%d\n",
- null->sample_rate, buf, null->nb_samples);
+ if (null->duration >= 0)
+ null->duration = av_rescale(null->duration, null->sample_rate, AV_TIME_BASE);
return 0;
}
-static int request_frame(AVFilterLink *outlink)
+static int activate(AVFilterContext *ctx)
{
- int ret;
- ANullContext *null = outlink->src->priv;
- AVFrame *samplesref;
+ ANullContext *null = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
- samplesref = ff_get_audio_buffer(outlink, null->nb_samples);
- if (!samplesref)
- return AVERROR(ENOMEM);
+ if (null->duration >= 0 && null->pts >= null->duration) {
+ ff_outlink_set_status(outlink, AVERROR_EOF, null->pts);
+ return 0;
+ }
- samplesref->pts = null->pts;
- samplesref->channel_layout = null->channel_layout;
- samplesref->sample_rate = outlink->sample_rate;
+ if (ff_outlink_frame_wanted(outlink)) {
+ AVFrame *samplesref = ff_get_audio_buffer(outlink, null->duration >= 0 ? FFMIN(null->nb_samples, null->duration - null->pts) : null->nb_samples);
- ret = ff_filter_frame(outlink, av_frame_clone(samplesref));
- av_frame_free(&samplesref);
- if (ret < 0)
- return ret;
+ if (!samplesref)
+ return AVERROR(ENOMEM);
+
+ samplesref->pts = null->pts;
+ null->pts += samplesref->nb_samples;
+
+ return ff_filter_frame(outlink, samplesref);
+ }
- null->pts += null->nb_samples;
- return ret;
+ return FFERROR_NOT_READY;
}
static const AVFilterPad avfilter_asrc_anullsrc_outputs[] = {
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_props,
- .request_frame = request_frame,
},
{ NULL }
};
.priv_size = sizeof(ANullContext),
.inputs = NULL,
.outputs = avfilter_asrc_anullsrc_outputs,
+ .activate = activate,
.priv_class = &anullsrc_class,
};