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ao_coreaudio: simplify ch label to speaker id conversion

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Previous code was using the values of the AudioChannelLabel enum directly to
create the channel bitmap. While this was quite smart it was pretty unreadable
and fragile (what if Apple changes the values of those enums?).

Change it to use a 'dumb' conversion table.
This commit is contained in:
Stefano Pigozzi 2013-11-27 18:58:28 +01:00
parent 69220aa1cd
commit f10cca0e88
1 changed files with 37 additions and 23 deletions
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60
audio/out/ao_coreaudio_utils.c
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@ -336,31 +336,45 @@ bool ca_change_format(struct ao *ao, AudioStreamID stream,
return format_set;
}
static const int speaker_map[][2] = {
{ kAudioChannelLabel_Left, MP_SPEAKER_ID_FL },
{ kAudioChannelLabel_Right, MP_SPEAKER_ID_FR },
{ kAudioChannelLabel_Center, MP_SPEAKER_ID_FC },
{ kAudioChannelLabel_LFEScreen, MP_SPEAKER_ID_LFE },
{ kAudioChannelLabel_LeftSurround, MP_SPEAKER_ID_BL },
{ kAudioChannelLabel_RightSurround, MP_SPEAKER_ID_BR },
{ kAudioChannelLabel_LeftCenter, MP_SPEAKER_ID_FLC },
{ kAudioChannelLabel_RightCenter, MP_SPEAKER_ID_FRC },
{ kAudioChannelLabel_CenterSurround, MP_SPEAKER_ID_BC },
{ kAudioChannelLabel_LeftSurroundDirect, MP_SPEAKER_ID_SL },
{ kAudioChannelLabel_RightSurroundDirect, MP_SPEAKER_ID_SR },
{ kAudioChannelLabel_TopCenterSurround, MP_SPEAKER_ID_TC },
{ kAudioChannelLabel_VerticalHeightLeft, MP_SPEAKER_ID_TFL },
{ kAudioChannelLabel_VerticalHeightCenter, MP_SPEAKER_ID_TFC },
{ kAudioChannelLabel_VerticalHeightRight, MP_SPEAKER_ID_TFR },
{ kAudioChannelLabel_TopBackLeft, MP_SPEAKER_ID_TBL },
{ kAudioChannelLabel_TopBackCenter, MP_SPEAKER_ID_TBC },
{ kAudioChannelLabel_TopBackRight, MP_SPEAKER_ID_TBR },
// unofficial extensions
{ kAudioChannelLabel_RearSurroundLeft, MP_SPEAKER_ID_SDL },
{ kAudioChannelLabel_RearSurroundRight, MP_SPEAKER_ID_SDR },
{ kAudioChannelLabel_LeftWide, MP_SPEAKER_ID_WL },
{ kAudioChannelLabel_RightWide, MP_SPEAKER_ID_WR },
{ kAudioChannelLabel_LFE2, MP_SPEAKER_ID_LFE2 },
{ kAudioChannelLabel_HeadphonesLeft, MP_SPEAKER_ID_DL },
{ kAudioChannelLabel_HeadphonesRight, MP_SPEAKER_ID_DR },
{ kAudioChannelLabel_Unknown, -1 },
};
static int ca_label_to_mp_speaker_id(AudioChannelLabel label)
{
if (label == kAudioChannelLabel_UseCoordinates ||
label == kAudioChannelLabel_Unknown ||
label > kAudioChannelLabel_LFE2)
return -1;
if (label <= kAudioChannelLabel_TopBackRight) {
return label - 1;
} else {
// Take care of extra labels after kAudioChannelLabel_TopBackRight
switch (label) {
case kAudioChannelLabel_RearSurroundLeft:
return MP_SPEAKER_ID_SDL;
case kAudioChannelLabel_RearSurroundRight:
return MP_SPEAKER_ID_SDR;
case kAudioChannelLabel_LeftWide:
return MP_SPEAKER_ID_WL;
case kAudioChannelLabel_RightWide:
return MP_SPEAKER_ID_WR;
case kAudioChannelLabel_LFE2:
return kAudioChannelLabel_LFE2;
}
return -1;
}
for (int i = 0; speaker_map[i][0] != kAudioChannelLabel_Unknown; i++)
if (speaker_map[i][0] == label)
return speaker_map[i][1];
return -1;
}
static bool ca_bitmap_from_ch_desc(struct ao *ao, AudioChannelLayout *layout,