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pcm: Provide areas_copy function which handles buffer wrap around

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The already existing areas_copy functions do not care about the end of
the source and destination buffer.
Therefore the caller has to take care that the requested offset+size
is not exceeding any buffer limit.

This additional function will take care about the end of an buffer
and will continue at the beginning of the buffer.
For example this is required when copying between buffers with
different sizes (not multiple of).
This is often the case in IO plugins like the JACK plugin.

Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Timo Wischer 2018-03-13 09:34:43 +01:00 • committed by Takashi Iwai
parent df2452cc6a
commit 22618077e7
2 changed files with 58 additions and 0 deletions
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9
include/pcm.h
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@ -1147,6 +1147,15 @@ int snd_pcm_area_copy(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes
int snd_pcm_areas_copy(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_channels, snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);
int snd_pcm_areas_copy_wrap(const snd_pcm_channel_area_t *dst_channels,
snd_pcm_uframes_t dst_offset,
const snd_pcm_uframes_t dst_size,
const snd_pcm_channel_area_t *src_channels,
snd_pcm_uframes_t src_offset,
const snd_pcm_uframes_t src_size,
const unsigned int channels,
snd_pcm_uframes_t frames,
const snd_pcm_format_t format);
/** \} */