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/*

 * QEMU OS X CoreAudio audio driver

 *

 * Copyright (c) 2005 Mike Kronenberg

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <CoreAudio/CoreAudio.h>

#include <string.h>             /* strerror */

#include <pthread.h>            /* pthread_X */

#include "vl.h"

#define AUDIO_CAP "coreaudio"

#include "audio_int.h"

struct {

    int buffer_frames;

    int nbuffers;

    int isAtexit;

} conf = {

    .buffer_frames = 512,

    .nbuffers = 4,

    .isAtexit = 0

};

typedef struct coreaudioVoiceOut {

    HWVoiceOut hw;

    pthread_mutex_t mutex;

    int isAtexit;

    AudioDeviceID outputDeviceID;

    UInt32 audioDevicePropertyBufferFrameSize;

    AudioStreamBasicDescription outputStreamBasicDescription;

    int live;

    int decr;

    int rpos;

} coreaudioVoiceOut;

static void coreaudio_logstatus (OSStatus status)

{

    char *str = "BUG";

    switch(status) {

    case kAudioHardwareNoError:

        str = "kAudioHardwareNoError";

        break;

    case kAudioHardwareNotRunningError:

        str = "kAudioHardwareNotRunningError";

        break;

    case kAudioHardwareUnspecifiedError:

        str = "kAudioHardwareUnspecifiedError";

        break;

    case kAudioHardwareUnknownPropertyError:

        str = "kAudioHardwareUnknownPropertyError";

        break;

    case kAudioHardwareBadPropertySizeError:

        str = "kAudioHardwareBadPropertySizeError";

        break;

    case kAudioHardwareIllegalOperationError:

        str = "kAudioHardwareIllegalOperationError";

        break;

    case kAudioHardwareBadDeviceError:

        str = "kAudioHardwareBadDeviceError";

        break;

    case kAudioHardwareBadStreamError:

        str = "kAudioHardwareBadStreamError";

        break;

    case kAudioHardwareUnsupportedOperationError:

        str = "kAudioHardwareUnsupportedOperationError";

        break;

    case kAudioDeviceUnsupportedFormatError:

        str = "kAudioDeviceUnsupportedFormatError";

        break;

    case kAudioDevicePermissionsError:

        str = "kAudioDevicePermissionsError";

        break;

    default:

        AUD_log (AUDIO_CAP, "Reason: status code %ld\n", status);

        return;

    }

    AUD_log (AUDIO_CAP, "Reason: %s\n", str);

}

static void GCC_FMT_ATTR (2, 3) coreaudio_logerr (

    OSStatus status,

    const char *fmt,

    ...

    )

{

    va_list ap;

    va_start (ap, fmt);

    AUD_log (AUDIO_CAP, fmt, ap);

    va_end (ap);

    coreaudio_logstatus (status);

}

static void GCC_FMT_ATTR (3, 4) coreaudio_logerr2 (

    OSStatus status,

    const char *typ,

    const char *fmt,

    ...

    )

{

    va_list ap;

    AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);

    va_start (ap, fmt);

    AUD_vlog (AUDIO_CAP, fmt, ap);

    va_end (ap);

    coreaudio_logstatus (status);

}

static inline UInt32 isPlaying (AudioDeviceID outputDeviceID)

{

    OSStatus status;

    UInt32 result = 0;

    UInt32 propertySize = sizeof(outputDeviceID);

    status = AudioDeviceGetProperty(

        outputDeviceID, 0, 0,

        kAudioDevicePropertyDeviceIsRunning, &propertySize, &result);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr(status,

                         "Could not determine whether Device is playing\n");

    }

    return result;

}

static void coreaudio_atexit (void)

{

    conf.isAtexit = 1;

}

static int coreaudio_lock (coreaudioVoiceOut *core, const char *fn_name)

{

    int err;

    err = pthread_mutex_lock (&core->mutex);

    if (err) {

        dolog ("Could not lock voice for %s\nReason: %s\n",

               fn_name, strerror (err));

        return -1;

    }

    return 0;

}

static int coreaudio_unlock (coreaudioVoiceOut *core, const char *fn_name)

{

    int err;

    err = pthread_mutex_unlock (&core->mutex);

    if (err) {

        dolog ("Could not unlock voice for %s\nReason: %s\n",

               fn_name, strerror (err));

        return -1;

    }

    return 0;

}

static int coreaudio_run_out (HWVoiceOut *hw)

{

    int live, decr;

    coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;

    if (coreaudio_lock (core, "coreaudio_run_out")) {

        return 0;

    }

    live = audio_pcm_hw_get_live_out (hw);

    if (core->decr > live) {

        ldebug ("core->decr %d live %d core->live %d\n",

                core->decr,

                live,

                core->live);

    }

    decr = audio_MIN (core->decr, live);

    core->decr -= decr;

    core->live = live - decr;

    hw->rpos = core->rpos;

    coreaudio_unlock (core, "coreaudio_run_out");

    return decr;

}

/* callback to feed audiooutput buffer */

static OSStatus audioDeviceIOProc(

    AudioDeviceID inDevice,

    const AudioTimeStamp* inNow,

    const AudioBufferList* inInputData,

    const AudioTimeStamp* inInputTime,

    AudioBufferList* outOutputData,

    const AudioTimeStamp* inOutputTime,

    void* hwptr)

{

    UInt32 frame, frameCount;

    float *out = outOutputData->mBuffers[0].mData;

    HWVoiceOut *hw = hwptr;

    coreaudioVoiceOut *core = (coreaudioVoiceOut *) hwptr;

    int rpos, live;

    st_sample_t *src;

#ifndef FLOAT_MIXENG

#ifdef RECIPROCAL

    const float scale = 1.f / UINT_MAX;

#else

    const float scale = UINT_MAX;

#endif

#endif

    if (coreaudio_lock (core, "audioDeviceIOProc")) {

        inInputTime = 0;

        return 0;

    }

    frameCount = core->audioDevicePropertyBufferFrameSize;

    live = core->live;

    /* if there are not enough samples, set signal and return */

    if (live < frameCount) {

        inInputTime = 0;

        coreaudio_unlock (core, "audioDeviceIOProc(empty)");

        return 0;

    }

    rpos = core->rpos;

    src = hw->mix_buf + rpos;

    /* fill buffer */

    for (frame = 0; frame < frameCount; frame++) {

#ifdef FLOAT_MIXENG

        *out++ = src[frame].l; /* left channel */

        *out++ = src[frame].r; /* right channel */

#else

#ifdef RECIPROCAL

        *out++ = src[frame].l * scale; /* left channel */

        *out++ = src[frame].r * scale; /* right channel */

#else

        *out++ = src[frame].l / scale; /* left channel */

        *out++ = src[frame].r / scale; /* right channel */

#endif

#endif

    }

    rpos = (rpos + frameCount) % hw->samples;

    core->decr += frameCount;

    core->rpos = rpos;

    coreaudio_unlock (core, "audioDeviceIOProc");

    return 0;

}

static int coreaudio_write (SWVoiceOut *sw, void *buf, int len)

{

    return audio_pcm_sw_write (sw, buf, len);

}

static int coreaudio_init_out (HWVoiceOut *hw, audsettings_t *as)

{

    OSStatus status;

    coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;

    UInt32 propertySize;

    int err;

    const char *typ = "playback";

    AudioValueRange frameRange;

    /* create mutex */

    err = pthread_mutex_init(&core->mutex, NULL);

    if (err) {

        dolog("Could not create mutex\nReason: %s\n", strerror (err));

        return -1;

    }

    audio_pcm_init_info (&hw->info, as);

    /* open default output device */

    propertySize = sizeof(core->outputDeviceID);

    status = AudioHardwareGetProperty(

        kAudioHardwarePropertyDefaultOutputDevice,

        &propertySize,

        &core->outputDeviceID);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ,

                           "Could not get default output Device\n");

        return -1;

    }

    if (core->outputDeviceID == kAudioDeviceUnknown) {

        dolog ("Could not initialize %s - Unknown Audiodevice\n", typ);

        return -1;

    }

    /* get minimum and maximum buffer frame sizes */

    propertySize = sizeof(frameRange);

    status = AudioDeviceGetProperty(

        core->outputDeviceID,

        0,

        0,

        kAudioDevicePropertyBufferFrameSizeRange,

        &propertySize,

        &frameRange);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ,

                           "Could not get device buffer frame range\n");

        return -1;

    }

    if (frameRange.mMinimum > conf.buffer_frames) {

        core->audioDevicePropertyBufferFrameSize = (UInt32) frameRange.mMinimum;

        dolog ("warning: Upsizing Buffer Frames to %f\n", frameRange.mMinimum);

    }

    else if (frameRange.mMaximum < conf.buffer_frames) {

        core->audioDevicePropertyBufferFrameSize = (UInt32) frameRange.mMaximum;

        dolog ("warning: Downsizing Buffer Frames to %f\n", frameRange.mMaximum);

    }

    else {

        core->audioDevicePropertyBufferFrameSize = conf.buffer_frames;

    }

    /* set Buffer Frame Size */

    propertySize = sizeof(core->audioDevicePropertyBufferFrameSize);

    status = AudioDeviceSetProperty(

        core->outputDeviceID,

        NULL,

        0,

        false,

        kAudioDevicePropertyBufferFrameSize,

        propertySize,

        &core->audioDevicePropertyBufferFrameSize);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ,

                           "Could not set device buffer frame size %ld\n",

                           core->audioDevicePropertyBufferFrameSize);

        return -1;

    }

    /* get Buffer Frame Size */

    propertySize = sizeof(core->audioDevicePropertyBufferFrameSize);

    status = AudioDeviceGetProperty(

        core->outputDeviceID,

        0,

        false,

        kAudioDevicePropertyBufferFrameSize,

        &propertySize,

        &core->audioDevicePropertyBufferFrameSize);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ,

                           "Could not get device buffer frame size\n");

        return -1;

    }

    hw->samples = conf.nbuffers * core->audioDevicePropertyBufferFrameSize;

    /* get StreamFormat */

    propertySize = sizeof(core->outputStreamBasicDescription);

    status = AudioDeviceGetProperty(

        core->outputDeviceID,

        0,

        false,

        kAudioDevicePropertyStreamFormat,

        &propertySize,

        &core->outputStreamBasicDescription);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ,

                           "Could not get Device Stream properties\n");

        core->outputDeviceID = kAudioDeviceUnknown;

        return -1;

    }

    /* set Samplerate */

    core->outputStreamBasicDescription.mSampleRate = (Float64) as->freq;

    propertySize = sizeof(core->outputStreamBasicDescription);

    status = AudioDeviceSetProperty(

        core->outputDeviceID,

        0,

        0,

        0,

        kAudioDevicePropertyStreamFormat,

        propertySize,

        &core->outputStreamBasicDescription);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ, "Could not set samplerate %d\n",

                           as->freq);

        core->outputDeviceID = kAudioDeviceUnknown;

        return -1;

    }

    /* set Callback */

    status = AudioDeviceAddIOProc(core->outputDeviceID, audioDeviceIOProc, hw);

    if (status != kAudioHardwareNoError) {

        coreaudio_logerr2 (status, typ, "Could not set IOProc\n");

        core->outputDeviceID = kAudioDeviceUnknown;

        return -1;

    }

    /* start Playback */

    if (!isPlaying(core->outputDeviceID)) {

        status = AudioDeviceStart(core->outputDeviceID, audioDeviceIOProc);

        if (status != kAudioHardwareNoError) {

            coreaudio_logerr2 (status, typ, "Could not start playback\n");

            AudioDeviceRemoveIOProc(core->outputDeviceID, audioDeviceIOProc);

            core->outputDeviceID = kAudioDeviceUnknown;

            return -1;

        }

    }

    return 0;

}

static void coreaudio_fini_out (HWVoiceOut *hw)

{

    OSStatus status;

    int err;

    coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;

    if (!conf.isAtexit) {

        /* stop playback */

        if (isPlaying(core->outputDeviceID)) {

            status = AudioDeviceStop(core->outputDeviceID, audioDeviceIOProc);

            if (status != kAudioHardwareNoError) {

                coreaudio_logerr (status, "Could not stop playback\n");

            }

        }

        /* remove callback */

        status = AudioDeviceRemoveIOProc(core->outputDeviceID,

                                         audioDeviceIOProc);

        if (status != kAudioHardwareNoError) {

            coreaudio_logerr (status, "Could not remove IOProc\n");

        }

    }

    core->outputDeviceID = kAudioDeviceUnknown;

    /* destroy mutex */

    err = pthread_mutex_destroy(&core->mutex);

    if (err) {

        dolog("Could not destroy mutex\nReason: %s\n", strerror (err));

    }

}

static int coreaudio_ctl_out (HWVoiceOut *hw, int cmd, ...)

{

    OSStatus status;

    coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;

    switch (cmd) {

    case VOICE_ENABLE:

        /* start playback */

        if (!isPlaying(core->outputDeviceID)) {

            status = AudioDeviceStart(core->outputDeviceID, audioDeviceIOProc);

            if (status != kAudioHardwareNoError) {

                coreaudio_logerr (status, "Could not resume playback\n");

            }

        }

        break;

    case VOICE_DISABLE:

        /* stop playback */

        if (!conf.isAtexit) {

            if (isPlaying(core->outputDeviceID)) {

                status = AudioDeviceStop(core->outputDeviceID, audioDeviceIOProc);

                if (status != kAudioHardwareNoError) {

                    coreaudio_logerr (status, "Could not pause playback\n");

                }

            }

        }

        break;

    }

    return 0;

}

static void *coreaudio_audio_init (void)

{

    atexit(coreaudio_atexit);

    return &coreaudio_audio_init;

}

static void coreaudio_audio_fini (void *opaque)

{

    (void) opaque;

}

static struct audio_option coreaudio_options[] = {

    {"BUFFER_SIZE", AUD_OPT_INT, &conf.buffer_frames,

     "Size of the buffer in frames", NULL, 0},

    {"BUFFER_COUNT", AUD_OPT_INT, &conf.nbuffers,

     "Number of buffers", NULL, 0},

    {NULL, 0, NULL, NULL, NULL, 0}

};

static struct audio_pcm_ops coreaudio_pcm_ops = {

    coreaudio_init_out,

    coreaudio_fini_out,

    coreaudio_run_out,

    coreaudio_write,

    coreaudio_ctl_out,

    NULL,

    NULL,

    NULL,

    NULL,

    NULL

};

struct audio_driver coreaudio_audio_driver = {

    INIT_FIELD (name           = ) "coreaudio",

    INIT_FIELD (descr          = )

    "CoreAudio http://developer.apple.com/audio/coreaudio.html",

    INIT_FIELD (options        = ) coreaudio_options,

    INIT_FIELD (init           = ) coreaudio_audio_init,

    INIT_FIELD (fini           = ) coreaudio_audio_fini,

    INIT_FIELD (pcm_ops        = ) &coreaudio_pcm_ops,

    INIT_FIELD (can_be_default = ) 1,

    INIT_FIELD (max_voices_out = ) 1,

    INIT_FIELD (max_voices_in  = ) 0,

    INIT_FIELD (voice_size_out = ) sizeof (coreaudioVoiceOut),

    INIT_FIELD (voice_size_in  = ) 0

};