ao_coreaudio: move channel mapping code to a separate file

Move all of the channel map retrieval/negotiation code to a separate
file. This will (probably) be helpful when extending
ao_coreaudio_exclusive.c.

Nothing else changes, other than some minor cosmetics and renaming,
and changing some details for decoupling it from the ao_coreaudio.c
internals.
This commit is contained in:
wm4 2015-05-05 21:47:19 +02:00
parent 399267393b
commit 934109a35b
4 changed files with 298 additions and 255 deletions

View File

@ -25,8 +25,9 @@
#include "options/m_option.h"
#include "misc/ring.h"
#include "common/msg.h"
#include "audio/out/ao_coreaudio_properties.h"
#include "audio/out/ao_coreaudio_utils.h"
#include "ao_coreaudio_chmap.h"
#include "ao_coreaudio_properties.h"
#include "ao_coreaudio_utils.h"
struct priv {
AudioDeviceID device;
@ -37,9 +38,6 @@ struct priv {
int change_physical_format;
};
bool ca_layout_to_mp_chmap(struct ao *ao, AudioChannelLayout *layout,
struct mp_chmap *chmap);
static int64_t ca_get_hardware_latency(struct ao *ao) {
struct priv *p = ao->priv;
@ -123,7 +121,6 @@ static int control(struct ao *ao, enum aocontrol cmd, void *arg)
return CONTROL_UNKNOWN;
}
static bool init_chmap(struct ao *ao);
static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd);
static void init_physical_format(struct ao *ao);
@ -160,7 +157,7 @@ static int init(struct ao *ao)
if (p->change_physical_format)
init_physical_format(ao);
if (!init_chmap(ao))
if (!ca_init_chmap(ao, p->device))
goto coreaudio_error;
ao->format = af_fmt_from_planar(ao->format);
@ -177,97 +174,6 @@ coreaudio_error:
return CONTROL_ERROR;
}
static AudioChannelLayout* ca_query_layout(struct ao *ao, void *talloc_ctx)
{
struct priv *p = ao->priv;
OSStatus err;
uint32_t psize;
AudioChannelLayout *r = NULL;
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioDevicePropertyPreferredChannelLayout,
.mScope = kAudioDevicePropertyScopeOutput,
.mElement = kAudioObjectPropertyElementWildcard,
};
err = AudioObjectGetPropertyDataSize(p->device, &p_addr, 0, NULL, &psize);
CHECK_CA_ERROR("could not get device preferred layout (size)");
r = talloc_size(talloc_ctx, psize);
err = AudioObjectGetPropertyData(p->device, &p_addr, 0, NULL, &psize, r);
CHECK_CA_ERROR("could not get device preferred layout (get)");
coreaudio_error:
return r;
}
static AudioChannelLayout* ca_query_stereo_layout(struct ao *ao, void *talloc_ctx)
{
struct priv *p = ao->priv;
OSStatus err;
const int nch = 2;
uint32_t channels[nch];
AudioChannelLayout *r = NULL;
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioDevicePropertyPreferredChannelsForStereo,
.mScope = kAudioDevicePropertyScopeOutput,
.mElement = kAudioObjectPropertyElementWildcard,
};
uint32_t psize = sizeof(channels);
err = AudioObjectGetPropertyData(p->device, &p_addr, 0, NULL, &psize, channels);
CHECK_CA_ERROR("could not get device preferred stereo layout");
psize = sizeof(AudioChannelLayout) + nch * sizeof(AudioChannelDescription);
r = talloc_zero_size(talloc_ctx, psize);
r->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
r->mNumberChannelDescriptions = nch;
AudioChannelDescription desc = {0};
desc.mChannelFlags = kAudioChannelFlags_AllOff;
for(int i = 0; i < nch; i++) {
desc.mChannelLabel = channels[i];
r->mChannelDescriptions[i] = desc;
}
coreaudio_error:
return r;
}
static bool init_chmap(struct ao *ao)
{
struct priv *p = ao->priv;
void *ta_ctx = talloc_new(NULL);
struct mp_chmap_sel chmap_sel = {.tmp = p};
struct mp_chmap chmap = {0};
AudioChannelLayout *ml = ca_query_layout(ao, ta_ctx);
if (ml && ca_layout_to_mp_chmap(ao, ml, &chmap))
mp_chmap_sel_add_map(&chmap_sel, &chmap);
AudioChannelLayout *sl = ca_query_stereo_layout(ao, ta_ctx);
if (sl && ca_layout_to_mp_chmap(ao, sl, &chmap))
mp_chmap_sel_add_map(&chmap_sel, &chmap);
talloc_free(ta_ctx);
if (!ao_chmap_sel_adjust(ao, &chmap_sel, &ao->channels)) {
MP_ERR(ao, "could not select a suitable channel map among the "
"hardware supported ones. Make sure to configure your "
"output device correctly in 'Audio MIDI Setup.app'\n");
goto coreaudio_error;
}
return true;
coreaudio_error:
return false;
}
static void init_physical_format(struct ao *ao)
{
struct priv *p = ao->priv;
@ -469,163 +375,6 @@ static void hotplug_uninit(struct ao *ao)
}
}
// Channel Mapping functions
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, MP_SPEAKER_ID_NA0 },
{ 0, -1 },
};
static int ca_label_to_mp_speaker_id(AudioChannelLabel label)
{
for (int i = 0; speaker_map[i][1] >= 0; i++)
if (speaker_map[i][0] == label)
return speaker_map[i][1];
return -1;
}
static void ca_log_layout(struct ao *ao, int l, AudioChannelLayout *layout)
{
if (!mp_msg_test(ao->log, l))
return;
AudioChannelDescription *descs = layout->mChannelDescriptions;
mp_msg(ao->log, l, "layout: tag: <%u>, bitmap: <%u>, "
"descriptions <%u>\n",
(unsigned) layout->mChannelLayoutTag,
(unsigned) layout->mChannelBitmap,
(unsigned) layout->mNumberChannelDescriptions);
for (int i = 0; i < layout->mNumberChannelDescriptions; i++) {
AudioChannelDescription d = descs[i];
mp_msg(ao->log, l, " - description %d: label <%u, %u>, "
" flags: <%u>, coords: <%f, %f, %f>\n", i,
(unsigned) d.mChannelLabel,
(unsigned) ca_label_to_mp_speaker_id(d.mChannelLabel),
(unsigned) d.mChannelFlags,
d.mCoordinates[0],
d.mCoordinates[1],
d.mCoordinates[2]);
}
}
static AudioChannelLayout *ca_layout_to_custom_layout(
struct ao *ao, void *talloc_ctx, AudioChannelLayout *l)
{
AudioChannelLayoutTag tag = l->mChannelLayoutTag;
AudioChannelLayout *r;
OSStatus err;
if (tag == kAudioChannelLayoutTag_UseChannelBitmap) {
uint32_t psize;
err = AudioFormatGetPropertyInfo(
kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(uint32_t), &l->mChannelBitmap, &psize);
CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (info)");
r = talloc_size(NULL, psize);
err = AudioFormatGetProperty(
kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(uint32_t), &l->mChannelBitmap, &psize, r);
CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (get)");
} else if (tag != kAudioChannelLayoutTag_UseChannelDescriptions) {
uint32_t psize;
err = AudioFormatGetPropertyInfo(
kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize);
r = talloc_size(NULL, psize);
CHECK_CA_ERROR("failed to convert channel tag to descriptions (info)");
err = AudioFormatGetProperty(
kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize, r);
CHECK_CA_ERROR("failed to convert channel tag to descriptions (get)");
} else {
r = l;
}
return r;
coreaudio_error:
return NULL;
}
bool ca_layout_to_mp_chmap(struct ao *ao, AudioChannelLayout *layout,
struct mp_chmap *chmap)
{
void *talloc_ctx = talloc_new(NULL);
MP_DBG(ao, "input channel layout:\n");
ca_log_layout(ao, MSGL_DEBUG, layout);
AudioChannelLayout *l = ca_layout_to_custom_layout(ao, talloc_ctx, layout);
if (!l)
goto coreaudio_error;
MP_VERBOSE(ao, "converted input channel layout:\n");
ca_log_layout(ao, MSGL_V, l);
if (l->mNumberChannelDescriptions > MP_NUM_CHANNELS) {
MP_VERBOSE(ao, "layout has too many descriptions (%u, max: %d)\n",
(unsigned) l->mNumberChannelDescriptions, MP_NUM_CHANNELS);
return false;
}
int next_na = MP_SPEAKER_ID_NA0;
for (int n = 0; n < l->mNumberChannelDescriptions; n++) {
AudioChannelLabel label = l->mChannelDescriptions[n].mChannelLabel;
uint8_t speaker = ca_label_to_mp_speaker_id(label);
if (speaker == MP_SPEAKER_ID_NA0 && next_na < MP_SPEAKER_ID_NA_LAST)
{
speaker = next_na++;
}
if (speaker < 0) {
MP_VERBOSE(ao, "channel label=%u unusable to build channel "
"bitmap, skipping layout\n", (unsigned) label);
goto coreaudio_error;
} else {
chmap->speaker[n] = speaker;
chmap->num = n + 1;
}
}
talloc_free(talloc_ctx);
return chmap->num > 0;
coreaudio_error:
MP_VERBOSE(ao, "converted input channel layout (failed):\n");
ca_log_layout(ao, MSGL_V, layout);
talloc_free(talloc_ctx);
return false;
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_coreaudio = {

View File

@ -0,0 +1,268 @@
/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common/common.h"
#include "ao_coreaudio_utils.h"
#include "ao_coreaudio_chmap.h"
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, MP_SPEAKER_ID_NA0 },
{ 0, -1 },
};
static int ca_label_to_mp_speaker_id(AudioChannelLabel label)
{
for (int i = 0; speaker_map[i][1] >= 0; i++)
if (speaker_map[i][0] == label)
return speaker_map[i][1];
return -1;
}
static void ca_log_layout(struct ao *ao, int l, AudioChannelLayout *layout)
{
if (!mp_msg_test(ao->log, l))
return;
AudioChannelDescription *descs = layout->mChannelDescriptions;
mp_msg(ao->log, l, "layout: tag: <%u>, bitmap: <%u>, "
"descriptions <%u>\n",
(unsigned) layout->mChannelLayoutTag,
(unsigned) layout->mChannelBitmap,
(unsigned) layout->mNumberChannelDescriptions);
for (int i = 0; i < layout->mNumberChannelDescriptions; i++) {
AudioChannelDescription d = descs[i];
mp_msg(ao->log, l, " - description %d: label <%u, %u>, "
" flags: <%u>, coords: <%f, %f, %f>\n", i,
(unsigned) d.mChannelLabel,
(unsigned) ca_label_to_mp_speaker_id(d.mChannelLabel),
(unsigned) d.mChannelFlags,
d.mCoordinates[0],
d.mCoordinates[1],
d.mCoordinates[2]);
}
}
static AudioChannelLayout *ca_layout_to_custom_layout(struct ao *ao,
void *talloc_ctx,
AudioChannelLayout *l)
{
AudioChannelLayoutTag tag = l->mChannelLayoutTag;
AudioChannelLayout *r;
OSStatus err;
if (tag == kAudioChannelLayoutTag_UseChannelBitmap) {
uint32_t psize;
err = AudioFormatGetPropertyInfo(
kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(uint32_t), &l->mChannelBitmap, &psize);
CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (info)");
r = talloc_size(NULL, psize);
err = AudioFormatGetProperty(
kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(uint32_t), &l->mChannelBitmap, &psize, r);
CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (get)");
} else if (tag != kAudioChannelLayoutTag_UseChannelDescriptions) {
uint32_t psize;
err = AudioFormatGetPropertyInfo(
kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize);
r = talloc_size(NULL, psize);
CHECK_CA_ERROR("failed to convert channel tag to descriptions (info)");
err = AudioFormatGetProperty(
kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize, r);
CHECK_CA_ERROR("failed to convert channel tag to descriptions (get)");
} else {
r = l;
}
return r;
coreaudio_error:
return NULL;
}
static bool ca_layout_to_mp_chmap(struct ao *ao, AudioChannelLayout *layout,
struct mp_chmap *chmap)
{
void *talloc_ctx = talloc_new(NULL);
MP_DBG(ao, "input channel layout:\n");
ca_log_layout(ao, MSGL_DEBUG, layout);
AudioChannelLayout *l = ca_layout_to_custom_layout(ao, talloc_ctx, layout);
if (!l)
goto coreaudio_error;
MP_VERBOSE(ao, "converted input channel layout:\n");
ca_log_layout(ao, MSGL_V, l);
if (l->mNumberChannelDescriptions > MP_NUM_CHANNELS) {
MP_VERBOSE(ao, "layout has too many descriptions (%u, max: %d)\n",
(unsigned) l->mNumberChannelDescriptions, MP_NUM_CHANNELS);
return false;
}
int next_na = MP_SPEAKER_ID_NA0;
for (int n = 0; n < l->mNumberChannelDescriptions; n++) {
AudioChannelLabel label = l->mChannelDescriptions[n].mChannelLabel;
uint8_t speaker = ca_label_to_mp_speaker_id(label);
if (speaker == MP_SPEAKER_ID_NA0 && next_na < MP_SPEAKER_ID_NA_LAST)
speaker = next_na++;
if (speaker < 0) {
MP_VERBOSE(ao, "channel label=%u unusable to build channel "
"bitmap, skipping layout\n", (unsigned) label);
goto coreaudio_error;
} else {
chmap->speaker[n] = speaker;
chmap->num = n + 1;
}
}
talloc_free(talloc_ctx);
return chmap->num > 0;
coreaudio_error:
MP_VERBOSE(ao, "converted input channel layout (failed):\n");
ca_log_layout(ao, MSGL_V, layout);
talloc_free(talloc_ctx);
return false;
}
static AudioChannelLayout* ca_query_layout(struct ao *ao,
AudioDeviceID device,
void *talloc_ctx)
{
OSStatus err;
uint32_t psize;
AudioChannelLayout *r = NULL;
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioDevicePropertyPreferredChannelLayout,
.mScope = kAudioDevicePropertyScopeOutput,
.mElement = kAudioObjectPropertyElementWildcard,
};
err = AudioObjectGetPropertyDataSize(device, &p_addr, 0, NULL, &psize);
CHECK_CA_ERROR("could not get device preferred layout (size)");
r = talloc_size(talloc_ctx, psize);
err = AudioObjectGetPropertyData(device, &p_addr, 0, NULL, &psize, r);
CHECK_CA_ERROR("could not get device preferred layout (get)");
coreaudio_error:
return r;
}
static AudioChannelLayout* ca_query_stereo_layout(struct ao *ao,
AudioDeviceID device,
void *talloc_ctx)
{
OSStatus err;
const int nch = 2;
uint32_t channels[nch];
AudioChannelLayout *r = NULL;
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioDevicePropertyPreferredChannelsForStereo,
.mScope = kAudioDevicePropertyScopeOutput,
.mElement = kAudioObjectPropertyElementWildcard,
};
uint32_t psize = sizeof(channels);
err = AudioObjectGetPropertyData(device, &p_addr, 0, NULL, &psize, channels);
CHECK_CA_ERROR("could not get device preferred stereo layout");
psize = sizeof(AudioChannelLayout) + nch * sizeof(AudioChannelDescription);
r = talloc_zero_size(talloc_ctx, psize);
r->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
r->mNumberChannelDescriptions = nch;
AudioChannelDescription desc = {0};
desc.mChannelFlags = kAudioChannelFlags_AllOff;
for(int i = 0; i < nch; i++) {
desc.mChannelLabel = channels[i];
r->mChannelDescriptions[i] = desc;
}
coreaudio_error:
return r;
}
bool ca_init_chmap(struct ao *ao, AudioDeviceID device)
{
void *ta_ctx = talloc_new(NULL);
struct mp_chmap_sel chmap_sel = {.tmp = ta_ctx};
struct mp_chmap chmap = {0};
AudioChannelLayout *ml = ca_query_layout(ao, device, ta_ctx);
if (ml && ca_layout_to_mp_chmap(ao, ml, &chmap))
mp_chmap_sel_add_map(&chmap_sel, &chmap);
AudioChannelLayout *sl = ca_query_stereo_layout(ao, device, ta_ctx);
if (sl && ca_layout_to_mp_chmap(ao, sl, &chmap))
mp_chmap_sel_add_map(&chmap_sel, &chmap);
if (!ao_chmap_sel_adjust(ao, &chmap_sel, &ao->channels)) {
MP_ERR(ao, "could not select a suitable channel map among the "
"hardware supported ones. Make sure to configure your "
"output device correctly in 'Audio MIDI Setup.app'\n");
goto coreaudio_error;
}
talloc_free(ta_ctx);
return true;
coreaudio_error:
talloc_free(ta_ctx);
return false;
}

View File

@ -0,0 +1,25 @@
/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MPV_COREAUDIO_CHMAP_H
#define MPV_COREAUDIO_CHMAP_H
#include <AudioToolbox/AudioToolbox.h>
bool ca_init_chmap(struct ao *ao, AudioDeviceID device);
#endif

View File

@ -132,6 +132,7 @@ def build(ctx):
( "audio/out/ao.c" ),
( "audio/out/ao_alsa.c", "alsa" ),
( "audio/out/ao_coreaudio.c", "coreaudio" ),
( "audio/out/ao_coreaudio_chmap.c", "coreaudio" ),
( "audio/out/ao_coreaudio_exclusive.c", "coreaudio" ),
( "audio/out/ao_coreaudio_properties.c", "coreaudio" ),
( "audio/out/ao_coreaudio_utils.c", "coreaudio" ),