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

Anton Khirnov committed 14 years ago

Commit 59d58b31 parent 5df320e2 files · +19 −0Browse files

Unified · Split

2 files

@@ -213,3 +213,17 @@ const char *av_get_channel_name(uint64_t channel) · 212 unmodified lines
213	return get_channel_name(i);	213	return get_channel_name(i);
214	return NULL;	214	return NULL;
215	}	215	}
		216
		217	uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
		218	{
		219	int i;
		220
		221	if (av_get_channel_layout_nb_channels(channel_layout) <= index)
		222	return 0;
		223
		224	for (i = 0; i < 64; i++) {
		225	if ((1ULL << i) & channel_layout && !index--)
		226	return 1ULL << i;
		227	}
		228	return 0;
		229	}

 int av_get_channel_layout_channel_index(uint64_t channel_layout,
                                         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.
  *

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