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| author | Anton Khirnov <anton@khirnov.net> | 2012-05-08 13:56:37 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2012-05-09 17:44:56 +0200 |
| commit | 6d7f61770094cc80ca2d93c4784c0091411d8242 (patch) | |
| tree | 3d49d468cfa07f34bc53b3b44d02135de4de6fd2 | |
| parent | 142e740d1ecc6059556f2748a18757d399ee061f (diff) | |
| download | ffmpeg-6d7f61770094cc80ca2d93c4784c0091411d8242.tar.gz | |
samplefmt: add a function for filling a buffer with silence.
| -rw-r--r-- | libavutil/samplefmt.c | 19 | ||||
| -rw-r--r-- | libavutil/samplefmt.h | 12 |
2 files changed, 31 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; +} diff --git a/libavutil/samplefmt.h b/libavutil/samplefmt.h index 9011889e68..e3aa6a9c36 100644 --- a/libavutil/samplefmt.h +++ b/libavutil/samplefmt.h @@ -209,4 +209,16 @@ int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt); +/** + * Fill an audio buffer with silence. + * + * @param audio_data array of pointers to data planes + * @param offset offset in samples at which to start filling + * @param nb_samples number of samples to fill + * @param nb_channels number of audio channels + * @param sample_fmt audio sample format + */ +int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, + int nb_channels, enum AVSampleFormat sample_fmt); + #endif /* AVUTIL_SAMPLEFMT_H */ |