From 6d7f61770094cc80ca2d93c4784c0091411d8242 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Tue, 8 May 2012 13:56:37 +0200 Subject: samplefmt: add a function for filling a buffer with silence. --- libavutil/samplefmt.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'libavutil/samplefmt.c') 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; +} -- cgit v1.2.3