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audio-channels: map buffer read-write only if channels differ

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gst_audio_buffer_reorder_channels() was always mapping the buffer read-write
regardless whether any reordering was needed.  If the from and to channel order
is identical return immediately without remapping the buffer.

Add a small helper function gst_audio_channel_positions_equal() which is used
in both gst_audio_reorder_channels() and gst_audio_buffer_reorder_channels().

https://bugzilla.gnome.org/show_bug.cgi?id=773833
This commit is contained in:
Petr Kulhavy 2016-11-07 12:01:16 +01:00 committed by Sebastian Dröge
parent 658ee6f0db
commit 54f4d3772c
1 changed files with 17 additions and 1 deletions
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18
gst-libs/gst/audio/audio-channels.c
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@ -121,6 +121,19 @@ static const GstAudioChannelPosition default_channel_order[64] = {
GST_AUDIO_CHANNEL_POSITION_INVALID
};
/*
* Compares @channels audio channel positions @p1 and @p2 if they are equal.
* In other words, tells whether channel reordering is needed (unequal) or not (equal).
*
* Returns: %TRUE if the channel positions are equal, i.e. no reordering is needed.
*/
static gboolean
gst_audio_channel_positions_equal (const GstAudioChannelPosition * p1,
const GstAudioChannelPosition * p2, gint channels)
{
return memcmp (p1, p2, channels * sizeof (p1[0])) == 0;
}
static gboolean
check_valid_channel_positions (const GstAudioChannelPosition * position,
gint channels, gboolean enforce_order, guint64 * channel_mask_out)
@ -211,7 +224,7 @@ gst_audio_reorder_channels (gpointer data, gsize size, GstAudioFormat format,
if (size == 0)
return TRUE;
if (memcmp (from, to, channels * sizeof (from[0])) == 0)
if (gst_audio_channel_positions_equal (from, to, channels))
return TRUE;
if (!gst_audio_get_channel_reorder_map (channels, from, to, reorder_map))
@ -260,6 +273,9 @@ gst_audio_buffer_reorder_channels (GstBuffer * buffer,
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
if (gst_audio_channel_positions_equal (from, to, channels))
return TRUE;
gst_buffer_map (buffer, &info, GST_MAP_READWRITE);
ret =