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audioconvert: add a function for extracting the channel with the given index

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This commit is contained in:
Anton Khirnov 2012-05-28 12:20:57 +02:00
parent 5df320e167
commit 59d58b3390
2 changed files with 19 additions and 0 deletions
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14
libavutil/audioconvert.c
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@ -213,3 +213,17 @@ const char *av_get_channel_name(uint64_t channel)
return get_channel_name(i); return get_channel_name(i);
return NULL; return NULL;
} }
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
{
int i;
if (av_get_channel_layout_nb_channels(channel_layout) <= index)
return 0;
for (i = 0; i < 64; i++) {
if ((1ULL << i) & channel_layout && !index--)
return 1ULL << i;
}
return 0;
}

5
libavutil/audioconvert.h
View File

@ -155,6 +155,11 @@ uint64_t av_get_default_channel_layout(int nb_channels);
int av_get_channel_layout_channel_index(uint64_t channel_layout, int av_get_channel_layout_channel_index(uint64_t channel_layout,
uint64_t channel); uint64_t channel);
/**
* Get the channel with the given index in channel_layout.
*/
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index);
/** /**
* Get the name of a given channel. * Get the name of a given channel.
* *