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avfilter/asrc_anullsrc: add support to set output duration
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@ -6076,6 +6076,13 @@ Specifies the sample rate, and defaults to 44100.
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@item nb_samples, n
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Set the number of samples per requested frames.
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@item duration, d
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Set the duration of the sourced audio. See
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@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}
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for the accepted syntax.
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If not specified, or the expressed duration is negative, the audio is
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supposed to be generated forever.
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@end table
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@subsection Examples
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@ -40,6 +40,7 @@ typedef struct ANullContext {
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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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@ -54,6 +55,8 @@ static const AVOption anullsrc_options[]= {
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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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{ "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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@ -108,6 +111,10 @@ static int request_frame(AVFilterLink *outlink)
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ANullContext *null = outlink->src->priv;
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AVFrame *samplesref;
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if (null->duration >= 0 &&
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av_rescale_q(null->pts, outlink->time_base, AV_TIME_BASE_Q) >= null->duration)
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return AVERROR_EOF;
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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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