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audio: add helper function to convert mask to channel positions

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... as there may be other than raw audio formats using a channel mask,
and there is already one to convert the other way around.
This commit is contained in:
Mark Nauwelaerts 2012-03-05 12:29:26 +01:00
parent debbc75272
commit d19f5467cc
2 changed files with 73 additions and 13 deletions
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83
gst-libs/gst/audio/audio.c
View file

@ -572,19 +572,8 @@ gst_audio_info_from_caps (GstAudioInfo * info, const GstCaps * caps)
for (i = 0; i < MIN (64, channels); i++)
position[i] = GST_AUDIO_CHANNEL_POSITION_NONE;
} else {
gint j;
j = 0;
for (i = 0; i < 64; i++) {
if ((channel_mask & (G_GUINT64_CONSTANT (1) << i))) {
position[j] = default_channel_order[i];
if (default_channel_order[i] == GST_AUDIO_CHANNEL_POSITION_INVALID)
goto invalid_channel_mask;
j++;
}
}
if (j != channels)
if (!gst_audio_channel_positions_from_mask (channels, channel_mask,
position))
goto invalid_channel_mask;
}
@ -1121,6 +1110,74 @@ gst_audio_channel_positions_to_mask (const GstAudioChannelPosition * position,
channel_mask);
}
/**
* gst_audio_channel_positions_from_mask:
* @channels: The number of channels
* @channel_mask: The input channel_mask
* @position: The %GstAudioChannelPositions
* @caps: a #GstCaps
*
* Convert the @channels present in @channel_mask to a @position array
* (which should have at least @channels entries ensured by caller).
* If @channel_mask is set to 0, it is considered as 'not present' for purpose
* of conversion.
*
* Returns: %TRUE if channel and channel mask are valid and could be converted
*/
gboolean
gst_audio_channel_positions_from_mask (gint channels, guint64 channel_mask,
GstAudioChannelPosition * position)
{
g_return_val_if_fail (position != NULL, FALSE);
g_return_val_if_fail (channels != 0, FALSE);
GST_DEBUG ("converting %d channels for "
" channel mask 0x%016" G_GINT64_MODIFIER "x");
if (!channel_mask) {
if (channels == 1) {
position[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
} else if (channels == 2) {
position[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
position[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
} else {
goto no_channel_mask;
}
} else {
gint i, j;
j = 0;
for (i = 0; i < 64; i++) {
if ((channel_mask & (G_GUINT64_CONSTANT (1) << i))) {
if (j < channels)
position[j] = default_channel_order[i];
if (default_channel_order[i] == GST_AUDIO_CHANNEL_POSITION_INVALID)
goto invalid_channel_mask;
j++;
}
}
if (j != channels)
goto invalid_channel_mask;
}
return TRUE;
/* ERROR */
no_channel_mask:
{
GST_ERROR ("no channel-mask property given");
return FALSE;
}
invalid_channel_mask:
{
GST_ERROR ("Invalid channel mask 0x%016" G_GINT64_MODIFIER
"x for %d channels", channel_mask, channels);
return FALSE;
}
}
/**
* gst_audio_get_channel_reorder_map:
* @channels: The number of channels.

3
gst-libs/gst/audio/audio.h
View file

@ -556,6 +556,9 @@ gboolean gst_audio_check_valid_channel_positions (const GstAudioChannelPos
gboolean gst_audio_channel_positions_to_mask (const GstAudioChannelPosition *position,
gint channels, guint64 *channel_mask);
gboolean gst_audio_channel_positions_from_mask (gint channels, guint64 channel_mask,
GstAudioChannelPosition * position);
gboolean gst_audio_get_channel_reorder_map (gint channels,
const GstAudioChannelPosition * from,
const GstAudioChannelPosition * to,