diff options
Diffstat (limited to 'libavfilter/asrc_anullsrc.c')
-rw-r--r-- | libavfilter/asrc_anullsrc.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/libavfilter/asrc_anullsrc.c b/libavfilter/asrc_anullsrc.c index 525fde4..a52f799 100644 --- a/libavfilter/asrc_anullsrc.c +++ b/libavfilter/asrc_anullsrc.c @@ -33,6 +33,8 @@ typedef struct { int64_t channel_layout; 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) @@ -42,6 +44,8 @@ static const AVOption anullsrc_options[]= { { "cl", "set channel_layout", OFFSET(channel_layout_str), FF_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0 }, { "sample_rate", "set sample rate", OFFSET(sample_rate_str) , FF_OPT_TYPE_STRING, {.str = "44100"}, 0, 0 }, { "r", "set sample rate", OFFSET(sample_rate_str) , FF_OPT_TYPE_STRING, {.str = "44100"}, 0, 0 }, + { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), FF_OPT_TYPE_INT, {.dbl = 1024}, 0, INT_MAX }, + { "n", "set the number of samples per requested frame", OFFSET(nb_samples), FF_OPT_TYPE_INT, {.dbl = 1024}, 0, INT_MAX }, { NULL }, }; @@ -92,15 +96,29 @@ static int config_props(AVFilterLink *outlink) chans_nb = av_get_channel_layout_nb_channels(priv->channel_layout); av_get_channel_layout_string(buf, sizeof(buf), chans_nb, priv->channel_layout); av_log(outlink->src, AV_LOG_INFO, - "sample_rate:%d channel_layout:%"PRId64 " channel_layout_description:'%s'\n", - priv->sample_rate, priv->channel_layout, buf); + "sample_rate:%d channel_layout:%"PRId64 " channel_layout_description:'%s' nb_samples:%d\n", + priv->sample_rate, priv->channel_layout, buf, priv->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 = + avfilter_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; + + avfilter_filter_samples(outlink, avfilter_ref_buffer(samplesref, ~0)); + avfilter_unref_buffer(samplesref); + + null->pts += null->nb_samples; + return 0; } AVFilter avfilter_asrc_anullsrc = { |