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avutil/channel_layout: add a helper function to get the ambisonic order of a layout

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2024-05-13 21:10:06 -03:00
parent 8155808ce6
commit 8c97449482
4 changed files with 22 additions and 10 deletions
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3
doc/APIchanges
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@ -2,6 +2,9 @@ The last version increases of all libraries were on 2024-03-07
API changes, most recent first:
2024-05-23 - xxxxxxxxxx - lavu 59.20.100 - channel_layout.h
Add av_channel_layout_ambisonic_order().
2024-05-xx - xxxxxxxxxx - lavu 59.19.100 - hwcontext_qsv.h
Add AVQSVFramesContext.info

17
libavutil/channel_layout.c
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@ -473,15 +473,14 @@ static int has_channel_names(const AVChannelLayout *channel_layout)
return 0;
}
/**
* If the layout is n-th order standard-order ambisonic, with optional
* extra non-diegetic channels at the end, return the order.
* Return a negative error code otherwise.
*/
static int ambisonic_order(const AVChannelLayout *channel_layout)
int av_channel_layout_ambisonic_order(const AVChannelLayout *channel_layout)
{
int i, highest_ambi, order;
if (channel_layout->order != AV_CHANNEL_ORDER_AMBISONIC &&
channel_layout->order != AV_CHANNEL_ORDER_CUSTOM)
return AVERROR(EINVAL);
highest_ambi = -1;
if (channel_layout->order == AV_CHANNEL_ORDER_AMBISONIC)
highest_ambi = channel_layout->nb_channels - av_popcount64(channel_layout->u.mask) - 1;
@ -536,7 +535,7 @@ static enum AVChannelOrder canonical_order(AVChannelLayout *channel_layout)
if (masked_description(channel_layout, 0) > 0)
return AV_CHANNEL_ORDER_NATIVE;
order = ambisonic_order(channel_layout);
order = av_channel_layout_ambisonic_order(channel_layout);
if (order >= 0 && masked_description(channel_layout, (order + 1) * (order + 1)) >= 0)
return AV_CHANNEL_ORDER_AMBISONIC;
@ -551,7 +550,7 @@ static enum AVChannelOrder canonical_order(AVChannelLayout *channel_layout)
static int try_describe_ambisonic(AVBPrint *bp, const AVChannelLayout *channel_layout)
{
int nb_ambi_channels;
int order = ambisonic_order(channel_layout);
int order = av_channel_layout_ambisonic_order(channel_layout);
if (order < 0)
return order;
@ -945,7 +944,7 @@ int av_channel_layout_retype(AVChannelLayout *channel_layout, enum AVChannelOrde
if (channel_layout->order == AV_CHANNEL_ORDER_CUSTOM) {
int64_t mask;
int nb_channels = channel_layout->nb_channels;
int order = ambisonic_order(channel_layout);
int order = av_channel_layout_ambisonic_order(channel_layout);
if (order < 0)
return AVERROR(ENOSYS);
mask = masked_description(channel_layout, (order + 1) * (order + 1));

10
libavutil/channel_layout.h
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@ -679,6 +679,16 @@ int av_channel_layout_check(const AVChannelLayout *channel_layout);
*/
int av_channel_layout_compare(const AVChannelLayout *chl, const AVChannelLayout *chl1);
/**
* Return the order if the layout is n-th order standard-order ambisonic.
* The presence of optional extra non-diegetic channels at the end is not taken
* into account.
*
* @param channel_layout input channel layout
* @return the order of the layout, a negative error code otherwise.
*/
int av_channel_layout_ambisonic_order(const AVChannelLayout *channel_layout);
/**
* The conversion must be lossless.
*/

2
libavutil/version.h
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@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 59
#define LIBAVUTIL_VERSION_MINOR 19
#define LIBAVUTIL_VERSION_MINOR 20
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \