ffmpeg | branch: master | Paul B Mahol <[email protected]> | Fri Sep 4 18:30:46 2020 +0200| [615d75f291c6cc3057074245ab83cbd48187dfbc] | committer: Paul B Mahol
avfilter/asrc_anullsrc: add support to set output duration > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=615d75f291c6cc3057074245ab83cbd48187dfbc --- doc/filters.texi | 7 +++++++ libavfilter/asrc_anullsrc.c | 7 +++++++ 2 files changed, 14 insertions(+) diff --git a/doc/filters.texi b/doc/filters.texi index ebe0d3301e..d0ff3d470f 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -6076,6 +6076,13 @@ Specifies the sample rate, and defaults to 44100. @item nb_samples, n Set the number of samples per requested frames. +@item duration, d +Set the duration of the sourced audio. See +@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils} +for the accepted syntax. + +If not specified, or the expressed duration is negative, the audio is +supposed to be generated forever. @end table @subsection Examples diff --git a/libavfilter/asrc_anullsrc.c b/libavfilter/asrc_anullsrc.c index 7093f08275..ab56d84424 100644 --- a/libavfilter/asrc_anullsrc.c +++ b/libavfilter/asrc_anullsrc.c @@ -40,6 +40,7 @@ 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; @@ -54,6 +55,8 @@ static const AVOption anullsrc_options[]= { { "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 }, + { "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 } }; @@ -108,6 +111,10 @@ static int request_frame(AVFilterLink *outlink) ANullContext *null = outlink->src->priv; AVFrame *samplesref; + if (null->duration >= 0 && + av_rescale_q(null->pts, outlink->time_base, AV_TIME_BASE_Q) >= null->duration) + return AVERROR_EOF; + samplesref = ff_get_audio_buffer(outlink, null->nb_samples); if (!samplesref) return AVERROR(ENOMEM); _______________________________________________ ffmpeg-cvslog mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
