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samplefmt: add a function for copying audio samples.

This commit is contained in:
Anton Khirnov 2012-05-06 14:10:38 +02:00
parent 9684341346
commit 142e740d1e
2 changed files with 34 additions and 0 deletions
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19
libavutil/samplefmt.c
View File

@ -185,3 +185,22 @@ int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
}
return 0;
}
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)
{
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 i;
dst_offset *= block_align;
src_offset *= block_align;
for (i = 0; i < planes; i++)
memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size);
return 0;
}

15
libavutil/samplefmt.h
View File

@ -194,4 +194,19 @@ int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
int nb_samples, enum AVSampleFormat sample_fmt, int align);
/**
* Copy samples from src to dst.
*
* @param dst destination array of pointers to data planes
* @param src source array of pointers to data planes
* @param dst_offset offset in samples at which the data will be written to dst
* @param src_offset offset in samples at which the data will be read from src
* @param nb_samples number of samples to be copied
* @param nb_channels number of audio channels
* @param sample_fmt audio sample format
*/
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);
#endif /* AVUTIL_SAMPLEFMT_H */