samplefmt: add a function for filling a buffer with silence.

1 files changed, 19 insertions, 0 deletions

diff --git a/libavutil/samplefmt.c b/libavutil/samplefmt.c
index 4d94fa69be..b6e785cb67 100644
--- a/libavutil/samplefmt.c
+++ b/libavutil/samplefmt.c
@@ -204,3 +204,22 @@ int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
 
     return 0;
 }
+
+int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
+                           int nb_channels, enum AVSampleFormat sample_fmt)
+{
+    int planar      = av_sample_fmt_is_planar(sample_fmt);
+    int planes      = planar ? nb_channels : 1;
+    int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
+    int data_size   = nb_samples * block_align;
+    int fill_char   = (sample_fmt == AV_SAMPLE_FMT_U8 ||
+                     sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00;
+    int i;
+
+    offset *= block_align;
+
+    for (i = 0; i < planes; i++)
+        memset(audio_data[i] + offset, fill_char, data_size);
+
+    return 0;
+}