ref: e3fde21dfc96db0c8998fae0f3999c6ab9a8a415
dir: /src/io/audio_unit.c/
/*
Copyright (C) 2013 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio 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 3 of the License, or
(at your option) any later version.
aubio 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 aubio. If not, see <http://www.gnu.org/licenses/>.
*/
#include "aubio_priv.h"
#ifdef HAVE_AUDIO_UNIT
#include "fvec.h"
#include "fmat.h"
#include "io/audio_unit.h"
#include <AudioToolbox/AudioToolbox.h>
#define AU_IOS_MAX_OUT 64
#define AU_IOS_MAX_FRAMES AU_IOS_MAX_OUT * 16 * 2
#define PREFERRED_LATENCY 0.010
#define MAX_FPS 4096
#define INT_TO_FLOAT 3.0517578125e-05 // 1. / 32768.
struct _aubio_audio_unit_t {
AudioUnit audio_unit;
uint_t samplerate;
uint_t blocksize;
uint_t sw_input_channels;
uint_t sw_output_channels;
uint_t hw_output_channels;
uint_t hw_input_channels;
Float32 latency;
sint_t total_frames;
fmat_t *input_frames;
fmat_t *output_frames;
SInt16 *au_ios_inbuf;
SInt16 *au_ios_outbuf;
aubio_device_callback_t callback;
void *callback_closure;
int dio_error; // flag to check if we had a read error
bool input_enabled;
bool prevent_feedback;
bool verbose;
int au_ios_start;
int au_ios_end;
AURenderCallbackStruct au_ios_cb_struct;
};
static OSStatus
aubio_audio_unit_process(void *closure, AudioUnitRenderActionFlags * action_flags,
const AudioTimeStamp * time_stamp, UInt32 bus_number, UInt32 inNumber_frames,
AudioBufferList * input_output);
static int aubio_audio_unit_blocking(aubio_audio_unit_t *o);
static void audio_unit_check_audio_route(aubio_audio_unit_t *o);
static void audio_unit_interruption_listener(void *closure, UInt32 inInterruptionState);
static void audio_unit_route_change_listener(void *closure, AudioSessionPropertyID
inID, UInt32 dataSize, const void *inData);
static OSStatus audio_unit_set_audio_session_category(bool has_input, bool verbose);
static UInt32 audio_unit_get_audio_session_category ();
aubio_audio_unit_t * new_aubio_audio_unit(uint_t samplerate,
uint_t sw_input_channels, uint_t sw_output_channels,
uint_t blocksize)
{
aubio_audio_unit_t * o = AUBIO_NEW(aubio_audio_unit_t);
o->hw_output_channels = 2;
o->hw_input_channels = 2;
o->sw_output_channels = sw_output_channels;
o->sw_input_channels = sw_input_channels;
o->samplerate = samplerate;
o->latency = PREFERRED_LATENCY;
o->blocksize = blocksize;
o->au_ios_start = 0;
o->au_ios_end = 0;
o->verbose = 0;
o->input_enabled = true;
o->prevent_feedback = 1;
o->dio_error = 0;
o->total_frames = 0;
/* the integers coming from and to the audio unit */
o->au_ios_outbuf = AUBIO_ARRAY(SInt16, AU_IOS_MAX_FRAMES * o->hw_output_channels);
o->au_ios_inbuf = AUBIO_ARRAY(SInt16, AU_IOS_MAX_FRAMES * o->hw_input_channels);
/* the floats coming from and to the device callback */
o->output_frames = new_fmat(sw_output_channels, blocksize);
o->input_frames = new_fmat(sw_input_channels, blocksize);
/* check for some sizes */
if ( o->hw_output_channels != o->output_frames->height ) {
AUBIO_ERR ("got hw_output_channels = %d, but output_frames has %d rows\n",
o->hw_output_channels, o->output_frames->height);
}
if ( o->blocksize != o->output_frames->length ) {
AUBIO_ERR ("got blocksize = %d, but output_frames has length %d\n",
o->blocksize, o->output_frames->length);
}
if ( o->hw_input_channels != o->input_frames->height ) {
AUBIO_ERR ("got hw_input_channels = %d, but input_frames has %d rows\n",
o->hw_input_channels, o->input_frames->height);
}
if ( o->blocksize != o->input_frames->length ) {
AUBIO_ERR ("got blocksize = %d, but input_frames has length %d\n",
o->blocksize, o->input_frames->length);
}
return o;
}
sint_t aubio_audio_unit_set_preferred_latency (aubio_audio_unit_t *o, smpl_t latency)
{
o->latency = latency;
return 0;
}
sint_t aubio_audio_unit_set_prevent_feedback (aubio_audio_unit_t *o, uint_t prevent_feedback)
{
o->prevent_feedback = prevent_feedback;
return 0;
}
sint_t aubio_audio_unit_set_verbose (aubio_audio_unit_t *o, uint_t verbose)
{
o->verbose = verbose;
return 0;
}
sint_t aubio_audio_unit_init (aubio_audio_unit_t *o)
{
OSStatus err = noErr;
Float32 latency = o->latency;
Float64 samplerate = (Float64)o->samplerate;
o->au_ios_cb_struct.inputProc = aubio_audio_unit_process;
o->au_ios_cb_struct.inputProcRefCon = o;
/* setting up audio session with interruption listener */
err = AudioSessionInitialize(NULL, NULL, audio_unit_interruption_listener, o);
if (err) { AUBIO_ERR("audio_unit: could not initialize audio session (%d)\n", (int)err); goto fail; }
audio_unit_set_audio_session_category(o->input_enabled, o->verbose);
audio_unit_check_audio_route(o);
/* add route change listener */
err = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange,
audio_unit_route_change_listener, o);
if (err) { AUBIO_ERR("audio_unit: could not set route change listener (%d)\n", (int)err); goto fail; }
/* set latency */
err = AudioSessionSetProperty(kAudioSessionProperty_PreferredHardwareIOBufferDuration,
sizeof(latency), &latency);
if (err) { AUBIO_ERR("audio_unit: could not set preferred latency (%d)\n", (int)err); goto fail; }
#if 0 // only for iphone OS >= 3.1
UInt32 val = 1; // set to 0 (default) to use ear speaker in voice application
err = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,
sizeof(UInt32), &val);
if (err) { AUBIO_ERR("audio_unit: could not set session property to default to speaker\n"); }
#endif
/* setting up audio unit */
AudioComponentDescription desc;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentType = kAudioUnitType_Output;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
AudioStreamBasicDescription audioFormat;
/* look for a component that match the description */
AudioComponent comp = AudioComponentFindNext(NULL, &desc);
/* create the audio component */
AudioUnit *audio_unit = &(o->audio_unit);
err = AudioComponentInstanceNew(comp, &(o->audio_unit));
if (err) { AUBIO_ERR("audio_unit: failed creating the audio unit\n"); goto fail; }
/* enable IO */
UInt32 enabled = 1;
err = AudioUnitSetProperty (*audio_unit, kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input, 1, &enabled, sizeof(enabled));
if (err) {
AUBIO_ERR("audio_unit: failed enabling input of audio unit\n");
goto fail;
}
/* set max fps */
UInt32 max_fps = MIN(o->blocksize, MAX_FPS);
err = AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_MaximumFramesPerSlice,
kAudioUnitScope_Global, 0, &max_fps, sizeof(max_fps));
if (err) {
AUBIO_ERR("audio_unit: could not set maximum frames per slice property (%d)\n", (int)err);
goto fail;
}
AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input, 0, &(o->au_ios_cb_struct), sizeof(o->au_ios_cb_struct));
if (err) { AUBIO_ERR("audio_unit: failed setting audio unit render callback\n"); goto fail; }
#if 0
err = AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_SampleRate,
kAudioUnitScope_Input, 0, &samplerate, sizeof(Float64));
if (err) { AUBIO_ERR("audio_unit: could not set audio input sample rate\n"); goto fail; }
err = AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_SampleRate,
kAudioUnitScope_Output, 1, &samplerate, sizeof(Float64));
if (err) { AUBIO_ERR("audio_unit: could not set audio input sample rate\n"); goto fail; }
#endif
audioFormat.mSampleRate = (Float64)samplerate;
audioFormat.mChannelsPerFrame = 2;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mBitsPerChannel = 8 * sizeof(SInt16);
#if 1 // interleaving
audioFormat.mBytesPerFrame = 2 * sizeof(SInt16);
audioFormat.mBytesPerPacket = 2 * sizeof(SInt16);
#else
audioFormat.mBytesPerPacket = audioFormat.mBytesPerFrame = sizeof(SInt32);
audioFormat.mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
#endif
err = AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, &audioFormat, sizeof(audioFormat));
if (err) { AUBIO_ERR("audio_unit: could not set audio output format\n"); goto fail; }
err = AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 1, &audioFormat, sizeof(audioFormat));
if (err) { AUBIO_ERR("audio_unit: could not set audio input format\n"); goto fail; }
#if 0
AudioStreamBasicDescription thruFormat;
thissize = sizeof(thruFormat);
err = AudioUnitGetProperty (*audio_unit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, &thruFormat, &thissize);
if (err) { AUBIO_ERR("audio_unit: could not get speaker output format, err: %d\n", (int)err); goto fail; }
err = AudioUnitSetProperty (*audio_unit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 1, &thruFormat, sizeof(thruFormat));
if (err) { AUBIO_ERR("audio_unit: could not set input audio format, err: %d\n", (int)err); goto fail; }
#endif
/* time to initialize the unit */
err = AudioUnitInitialize(*audio_unit);
if (err) { AUBIO_ERR("audio_unit: failed initializing audio, err: %d\n", (int)err); goto fail; }
return 0;
fail:
return err;
}
/* perform function */
OSStatus
aubio_audio_unit_process(void *closure, AudioUnitRenderActionFlags * action_flags,
const AudioTimeStamp * time_stamp, UNUSED UInt32 bus_number, UInt32 inNumber_frames,
AudioBufferList * input_output)
{
UInt32 b; int err = 0;
aubio_audio_unit_t *o = (aubio_audio_unit_t *)closure;
AudioUnit thisUnit = o->audio_unit;
if (o->input_enabled) {
err = AudioUnitRender(thisUnit, action_flags, time_stamp, 1,
inNumber_frames, input_output);
if (err) {
AUBIO_ERR("audio_unit: error performing AudioUnitRender (%d)\n", err);
return err;
}
}
// get the number of frames from the audio buffer list, NOT inNumber_frames
UInt32 number_frames = input_output->mBuffers[0].mDataByteSize/ sizeof(SInt16) / 2;
// FIXME find out why this happens
if (number_frames < 10) {
AUBIO_ERR("audio_unit: got number_frames %d\n", (int)number_frames);
return -1;
}
if (o->total_frames >= (signed)number_frames) {
SInt16 *data;
if (o->au_ios_start + number_frames > AU_IOS_MAX_FRAMES) {
// start reminder samples writing at reminder
int reminder = AU_IOS_MAX_FRAMES - o->au_ios_start;
int starter = (o->au_ios_start + number_frames) - AU_IOS_MAX_FRAMES;
for (b = 0; b < input_output->mNumberBuffers; b++) {
data = (SInt16 *)(input_output->mBuffers[b].mData);
/* copy microphone output to input buffer */
memcpy (o->au_ios_inbuf + o->au_ios_start * 2, data, reminder * 2 * sizeof(SInt16));
memcpy (o->au_ios_inbuf, data + reminder * 2, starter * 2 * sizeof(SInt16));
/* silence data before copying from output */
//memset (data, 0, input_output->mBuffers[b].mDataByteSize);
/* copy output buffer to speakers */
memcpy (data, o->au_ios_outbuf + o->au_ios_start * 2, reminder * 2 * sizeof(SInt16));
memcpy (data + reminder * 2, o->au_ios_outbuf, starter * 2 * sizeof(SInt16));
}
} else {
for (b = 0; b < input_output->mNumberBuffers; b++) {
data = (SInt16 *)(input_output->mBuffers[b].mData);
/* copy microphone samples to au_ios_inbuf */
memcpy(o->au_ios_inbuf + o->au_ios_start * 2, data, number_frames * 2 * sizeof(SInt16));
/* silence data before copying from output */
//memset (data, 0, input_output->mBuffers[b].mDataByteSize);
/* copy output buffer to speakers */
memcpy(data, o->au_ios_outbuf + o->au_ios_start * 2, number_frames * 2 * sizeof(SInt16));
}
}
o->au_ios_start += number_frames;
o->au_ios_start %= AU_IOS_MAX_FRAMES;
o->total_frames -= number_frames;
#if 1
} else {
if (o->total_frames > 0) o->dio_error = 1;
for (b = 0; b < input_output->mNumberBuffers; b++) {
memset (input_output->mBuffers[b].mData, 0,
input_output->mBuffers[b].mDataByteSize);
}
//total_frames = 0;
#endif
}
// now call callback
while ( o->total_frames < (signed)number_frames ) {
//AUBIO_DBG ("audio_unit: total_frames = %d, number_frames = %d, o->au_ios_start = %d, o->au_ios_end = %d",
// o->total_frames, number_frames, o->au_ios_start, o->au_ios_end);
aubio_audio_unit_blocking(o);
}
return err;
}
int aubio_audio_unit_blocking(aubio_audio_unit_t *o)
{
uint_t sw_output_channels, sw_input_channels,
hw_output_channels, hw_input_channels,
i, j, blocksize;
if (! o->callback) return -1;
smpl_t ** tbuf;
sw_output_channels = o->sw_output_channels;
sw_input_channels = o->sw_input_channels;
hw_output_channels = o->hw_output_channels;
hw_input_channels = o->hw_input_channels;
blocksize = o->blocksize;
if (!sw_input_channels && !sw_output_channels) goto fail;
if (o->dio_error) {
AUBIO_WRN("audio_unit: dio error %d\n", o->total_frames);
o->dio_error = 0;
}
if (o->au_ios_inbuf) {
/* copy samples from input buffer */
tbuf = o->input_frames->data;
if (o->input_enabled) {
for (j = 0; j < blocksize;j++) {
for (i = 0; i < sw_input_channels && i < hw_input_channels; i++) {
//tbuf[i][j] =
// (smpl_t)(o->au_ios_inbuf[i + (j + o->au_ios_end) * sw_input_channels] / 32768.);
// on iphone, input is mono, copy right to left channel
tbuf[i][j] =
(smpl_t) o->au_ios_inbuf[0 + (j + o->au_ios_end) * hw_input_channels]
* INT_TO_FLOAT;
}
}
} else {
// input is disabled, fill with zeroes
for (j = 0; j < blocksize; j++) {
for (i = 0; i < sw_input_channels && i < hw_input_channels; i++) {
tbuf[i][j] = 0;
}
}
}
}
o->callback(o->callback_closure, o->input_frames, o->output_frames);
/* copy samples to output buffer */
tbuf = o->output_frames->data;
for (i = 0; i < o->output_frames->height; i++) {
for (j = 0; j < o->output_frames->length; j++) {
smpl_t val = tbuf[i][j];
if (val < -1.0) val = -1.0;
if (val > 1.0) val = 1.0;
o->au_ios_outbuf[i + (j + o->au_ios_end) * hw_output_channels ] = (SInt16)(val * 32767);
}
}
o->au_ios_end += blocksize;
o->au_ios_end %= AU_IOS_MAX_FRAMES;
o->total_frames += blocksize;
return 0;
fail:
AUBIO_ERR("audio_unit: callback() failed\n");
o->total_frames += AU_IOS_MAX_FRAMES;
return 1;
}
sint_t aubio_audio_unit_get_info (aubio_audio_unit_t *o)
{
UInt32 thissize, input_hw_channels, output_hw_channels, max_fps;
Float32 latency, input_latency, output_latency, input_hw_volume, output_hw_volume;
Float64 samplerate;
OSStatus err = 0;
// Show some info about the opened unit
/* get sampling rate */
thissize = sizeof(samplerate);
err = AudioUnitGetProperty (o->audio_unit, kAudioUnitProperty_SampleRate,
kAudioUnitScope_Output, 1, &samplerate, &thissize);
if (err) { AUBIO_ERR("audio_unit: could not get audio unit sample rate (%d)\n",
(int)err); goto fail; }
/* get hardware input channels */
thissize = sizeof(input_hw_channels);
err = AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareInputNumberChannels,
&thissize, &input_hw_channels);
if (err) { AUBIO_ERR("audio_unit: could not get hardware input channels (%d)\n",
(int)err); goto fail; }
/* get hardware output channels */
thissize = sizeof(output_hw_channels);
err = AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareOutputNumberChannels,
&thissize, &output_hw_channels);
if (err) { AUBIO_ERR("audio_unit: could not get hardware output channels (%d)\n",
(int)err); goto fail; }
/* get hardware input volume */
thissize = sizeof(input_hw_volume);
err = AudioSessionGetProperty(kAudioSessionProperty_InputGainScalar,
&thissize, &input_hw_volume);
if (err) { AUBIO_ERR("audio_unit: could not get hardware input volume (%d)\n",
(int)err); goto fail; }
/* get hardware output volume */
thissize = sizeof(output_hw_volume);
err = AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareOutputVolume,
&thissize, &output_hw_volume);
if (err) { AUBIO_ERR("audio_unit: could not get hardware output volume (%d)\n",
(int)err); goto fail; }
AUBIO_MSG("audio_unit: opened at %.0fHz, sw channels %din/%dout, hw channels %din/%dout, hw vol %.2fin/%.2fout\n",
samplerate,
o->sw_input_channels, o->sw_output_channels,
(unsigned int)input_hw_channels, (unsigned int)output_hw_channels,
input_hw_volume, output_hw_volume);
/* get max frames per slice */
thissize = sizeof(max_fps);
err = AudioUnitGetProperty (o->audio_unit, kAudioUnitProperty_MaximumFramesPerSlice,
kAudioUnitScope_Global, 0, &max_fps, &thissize);
if (err) { AUBIO_ERR("audio_unit: could not get maximum frames per slice property %d\n",
(int)err); goto fail; }
/* get hardware latency */
thissize = sizeof(latency);
err = AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareIOBufferDuration,
&thissize, &latency);
if (err) { AUBIO_ERR("audio_unit: could not get hardware latency %d\n",
(int)err); goto fail; }
/* get input latency */
thissize = sizeof(input_latency);
err = AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareInputLatency,
&thissize, &input_latency);
if (err) { AUBIO_ERR("audio_unit: could not get input latency %d\n",
(int)err); goto fail; }
/* get output harlatency */
thissize = sizeof(output_latency);
err = AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareOutputLatency,
&thissize, &output_latency);
if (err) { AUBIO_ERR("audio_unit: could not get output latency %d\n",
(int)err); goto fail; }
AUBIO_MSG("audio_unit: I/O latency: %.2fms, %d frames, (%.2fms, %d frames in, %.2fms %d frames out)\n",
latency*1000., (sint_t)round(latency*samplerate),
input_latency*1000., (sint_t)ROUND(input_latency*samplerate),
output_latency*1000., (sint_t)ROUND(output_latency*samplerate));
fail:
return err;
}
sint_t aubio_audio_unit_start(aubio_audio_unit_t *o) {
OSStatus err = 0;
if (o->verbose) {
// print some info about the current settings
aubio_audio_unit_get_info (o);
}
/* time to start the unit */
err = AudioOutputUnitStart (o->audio_unit);
if (err) { AUBIO_ERR("audio_unit: could not start unit (%d)\n", (int)err); }
return err;
}
sint_t aubio_audio_unit_stop(aubio_audio_unit_t *o)
{
if (o->audio_unit == NULL) return -1;
OSStatus err = AudioOutputUnitStop (o->audio_unit);
if (err) { AUBIO_WRN("audio_unit: failed stopping audio unit (%d)\n", (int)err); }
err = AudioUnitUninitialize (o->audio_unit);
if (err) { AUBIO_WRN("audio_unit: failed unitializing audio unit (%d)\n", (int)err); }
err = AudioSessionSetActive(false);
if (err) { AUBIO_WRN("audio_unit: failed stopping audio session (%d)\n", (int)err); }
return err;
}
uint_t aubio_audio_unit_set_callback(aubio_audio_unit_t *o,
aubio_device_callback_t callback, void *closure) {
o->callback = callback;
o->callback_closure = closure;
return 0;
}
/* interruption listeners */
void audio_unit_interruption_listener(void *closure, UInt32 inInterruptionState)
{
OSStatus err = 0;
aubio_audio_unit_t *o = (aubio_audio_unit_t *) closure;
AudioUnit this_unit = o->audio_unit;
if (inInterruptionState == kAudioSessionEndInterruption) {
AUBIO_WRN("audio_unit: session interruption ended\n");
err = AudioSessionSetActive(true);
if (err) {
AUBIO_ERR("audio_unit: could not make session active after interruption (%d)\n", (int)err);
goto fail;
}
err = AudioOutputUnitStart(this_unit);
if (err) {
AUBIO_ERR("audio_unit: failed starting unit (%d)\n", (int)err);
goto fail;
}
}
if (inInterruptionState == kAudioSessionBeginInterruption) {
AUBIO_WRN("audio_unit: session interruption started\n");
err = AudioOutputUnitStop(this_unit);
if (err) {
AUBIO_ERR("audio_unit: could not stop unit at interruption (%d)\n", (int)err);
goto fail;
}
err = AudioSessionSetActive(false);
if (err) {
AUBIO_ERR("audio_unit: could not make session inactive after interruption (%d)\n", (int)err);
goto fail;
}
}
fail:
return;
}
UInt32 audio_unit_get_audio_session_category () {
UInt32 category, thissize;
thissize = sizeof(category);
OSStatus err = AudioSessionGetProperty(kAudioSessionProperty_AudioCategory,
&thissize, &category);
if (err) {
AUBIO_ERR("audio_unit: could not get audio category (%d)\n", (int)err);
return err;
}
if (category == kAudioSessionCategory_AmbientSound) {
AUBIO_MSG("audio_unit: session category is AmbiantSound\n");
} else if (category == kAudioSessionCategory_SoloAmbientSound) {
AUBIO_MSG("audio_unit: session category is SoloAmbiantSound\n");
} else if (category == kAudioSessionCategory_MediaPlayback) {
AUBIO_MSG("audio_unit: session category is MediaPlayback\n");
} else if (category == kAudioSessionCategory_RecordAudio) {
AUBIO_MSG("audio_unit: session category is RecordAudio\n");
} else if (category == kAudioSessionCategory_PlayAndRecord) {
AUBIO_MSG("audio_unit: session category is PlayAndRecord\n");
} else if (category == kAudioSessionCategory_AudioProcessing) {
AUBIO_MSG("audio_unit: session category is AudioProcessing\n");
}
return category;
}
OSStatus audio_unit_set_audio_session_category(bool has_input, bool verbose)
{
//if we have input, set the session category accordingly
OSStatus err = 0;
UInt32 category;
if (has_input) {
category = kAudioSessionCategory_PlayAndRecord;
if (verbose) AUBIO_MSG("audio_unit: setting category to PlayAndRecord\n");
} else {
category = kAudioSessionCategory_MediaPlayback;
if (verbose) AUBIO_MSG("audio_unit: setting category to MediaPlayback\n");
}
err = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
sizeof(category), &category);
if (err) {
AUBIO_ERR("audio_unit: could not set audio category\n");
}
// Audiob.us style
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,
sizeof (allowMixing), &allowMixing);
if (err) {
AUBIO_ERR("audio_unit: could not set audio session to mix with others\n");
}
return err;
}
void audio_unit_check_audio_route(aubio_audio_unit_t *o) {
CFStringRef currentRoute;
UInt32 val, thissize = sizeof(currentRoute);
OSStatus err = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &thissize, ¤tRoute);
if (err) { AUBIO_ERR("audio_unit: could not get current route\n"); goto fail; }
else {
char *route = (char *)CFStringGetCStringPtr ( currentRoute, kCFStringEncodingUTF8);
if (route == NULL) {
int bufferSize = 25;
route = calloc(bufferSize, sizeof(char));
CFStringGetCString ( currentRoute, route, bufferSize,
kCFStringEncodingUTF8);
}
if (o->verbose) {
AUBIO_MSG ("audio_unit: current route is %s\n", route);
}
//free(route);
}
if( currentRoute ) {
if( CFStringCompare( currentRoute, CFSTR("Headset"), 0 ) == kCFCompareEqualTo ) {
val = kAudioSessionOverrideAudioRoute_None;
} else if( CFStringCompare( currentRoute, CFSTR("Receiver" ), 0 ) == kCFCompareEqualTo ) {
val = kAudioSessionOverrideAudioRoute_Speaker;
} else if( CFStringCompare( currentRoute, CFSTR("ReceiverAndMicrophone" ), 0 ) == kCFCompareEqualTo ) {
val = kAudioSessionOverrideAudioRoute_Speaker;
} else if( CFStringCompare( currentRoute, CFSTR("SpeakerAndMicrophone" ), 0 ) == kCFCompareEqualTo ) {
val = kAudioSessionOverrideAudioRoute_Speaker;
} else if( CFStringCompare( currentRoute, CFSTR("HeadphonesAndMicrophone" ), 0 ) == kCFCompareEqualTo ) {
val = kAudioSessionOverrideAudioRoute_None;
} else if( CFStringCompare( currentRoute, CFSTR("HeadsetInOut" ), 0 ) == kCFCompareEqualTo ) {
val = kAudioSessionOverrideAudioRoute_None;
} else {
val = kAudioSessionOverrideAudioRoute_None;
}
o->input_enabled = true;
if (val == kAudioSessionOverrideAudioRoute_Speaker) {
if (o->prevent_feedback) {
o->input_enabled = false;
if (o->verbose) {
AUBIO_MSG ("audio_unit: disabling input to avoid feedback\n");
}
} else {
AUBIO_WRN ("audio_unit: input not disabled as prevent_feedback set to 0, risking feedback\n");
}
}
err = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute,
sizeof(UInt32), &val);
if (err) { AUBIO_ERR("audio_unit: could not set session OverrideAudioRoute to Speaker\n"); }
}
fail:
if ( currentRoute ) free((void*)currentRoute);
return;
}
SInt32
audio_unit_get_route_change_reason(CFDictionaryRef routeChangeDic) {
CFNumberRef routeChangeReasonRef = (CFNumberRef)CFDictionaryGetValue(routeChangeDic,
CFSTR(kAudioSession_AudioRouteChangeKey_Reason));
SInt32 change_reason_number;
CFNumberGetValue ( routeChangeReasonRef, kCFNumberSInt32Type, &change_reason_number);
switch (change_reason_number) {
case kAudioSessionRouteChangeReason_NewDeviceAvailable:
AUBIO_MSG("audio_unit: route changed to NewDeviceAvailable\n");
break;
case kAudioSessionRouteChangeReason_OldDeviceUnavailable:
AUBIO_MSG("audio_unit: route changed to OldDeviceUnavailable\n");
break;
case kAudioSessionRouteChangeReason_CategoryChange:
AUBIO_MSG("audio_unit: route changed to CategoryChange\n");
audio_unit_get_audio_session_category();
break;
case kAudioSessionRouteChangeReason_Override:
AUBIO_MSG("audio_unit: route changed to Override\n");
break;
case kAudioSessionRouteChangeReason_WakeFromSleep:
AUBIO_MSG("audio_unit: route changed to WakeFromSleep\n");
break;
case kAudioSessionRouteChangeReason_NoSuitableRouteForCategory:
AUBIO_MSG("audio_unit: route changed to NoSuitableRouteForCategory\n");
break;
case kAudioSessionRouteChangeReason_Unknown:
default:
AUBIO_ERR("audio_unit: route changed for an unknown reason!?\n");
break;
}
return change_reason_number;
}
/* route change listeners */
void
audio_unit_route_change_listener(void *closure, AudioSessionPropertyID inID,
UInt32 dataSize, const void *inData)
{
UNUSED aubio_audio_unit_t *o = (aubio_audio_unit_t *)closure;
UNUSED UInt32 size = dataSize;
if (inID == kAudioSessionProperty_AudioRouteChange) {
// OSStatus err = 0;
//AudioUnit audio_unit = o->audio_unit;
if (o->verbose) {
// show route change reason
audio_unit_get_route_change_reason((CFDictionaryRef)inData);
}
// check current audio route, changing it to prevent feedback as needed
audio_unit_check_audio_route(o);
if (o->verbose) {
// print some info about the current settings
aubio_audio_unit_get_info(o);
}
}
}
/* delete object */
uint_t del_aubio_audio_unit(aubio_audio_unit_t *o)
{
int err = 0;
err = aubio_audio_unit_stop(o);
if (o->au_ios_inbuf) free(o->au_ios_inbuf);
o->au_ios_inbuf = NULL;
if (o->au_ios_outbuf) free(o->au_ios_outbuf);
o->au_ios_outbuf = NULL;
del_fmat (o->input_frames);
del_fmat (o->output_frames);
o->audio_unit = NULL;
return (int)err;
}
#endif /* HAVE_AUDIO_UNIT */