Archipelago » qemu

/*

 * Copyright (C) 2010 Red Hat, Inc.

 *

 * maintained by Gerd Hoffmann <kraxel@redhat.com>

 *

 * This program 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 or

 * (at your option) version 3 of the License.

 *

 * This program 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 this program; if not, see <http://www.gnu.org/licenses/>.

 */

#include "hw/hw.h"

#include "qemu-timer.h"

#include "ui/qemu-spice.h"

#define AUDIO_CAP "spice"

#include "audio.h"

#include "audio_int.h"

#define LINE_IN_SAMPLES 1024

#define LINE_OUT_SAMPLES 1024

typedef struct SpiceRateCtl {

    int64_t               start_ticks;

    int64_t               bytes_sent;

} SpiceRateCtl;

typedef struct SpiceVoiceOut {

    HWVoiceOut            hw;

    SpicePlaybackInstance sin;

    SpiceRateCtl          rate;

    int                   active;

    uint32_t              *frame;

    uint32_t              *fpos;

    uint32_t              fsize;

} SpiceVoiceOut;

typedef struct SpiceVoiceIn {

    HWVoiceIn             hw;

    SpiceRecordInstance   sin;

    SpiceRateCtl          rate;

    int                   active;

    uint32_t              samples[LINE_IN_SAMPLES];

} SpiceVoiceIn;

static const SpicePlaybackInterface playback_sif = {

    .base.type          = SPICE_INTERFACE_PLAYBACK,

    .base.description   = "playback",

    .base.major_version = SPICE_INTERFACE_PLAYBACK_MAJOR,

    .base.minor_version = SPICE_INTERFACE_PLAYBACK_MINOR,

};

static const SpiceRecordInterface record_sif = {

    .base.type          = SPICE_INTERFACE_RECORD,

    .base.description   = "record",

    .base.major_version = SPICE_INTERFACE_RECORD_MAJOR,

    .base.minor_version = SPICE_INTERFACE_RECORD_MINOR,

};

static void *spice_audio_init (void)

{

    if (!using_spice) {

        return NULL;

    }

    return &spice_audio_init;

}

static void spice_audio_fini (void *opaque)

{

    /* nothing */

}

static void rate_start (SpiceRateCtl *rate)

{

    memset (rate, 0, sizeof (*rate));

    rate->start_ticks = qemu_get_clock_ns (vm_clock);

}

static int rate_get_samples (struct audio_pcm_info *info, SpiceRateCtl *rate)

{

    int64_t now;

    int64_t ticks;

    int64_t bytes;

    int64_t samples;

    now = qemu_get_clock_ns (vm_clock);

    ticks = now - rate->start_ticks;

    bytes = muldiv64 (ticks, info->bytes_per_second, get_ticks_per_sec ());

    samples = (bytes - rate->bytes_sent) >> info->shift;

    if (samples < 0 || samples > 65536) {

        fprintf (stderr, "Resetting rate control (%" PRId64 " samples)\n", samples);

        rate_start (rate);

        samples = 0;

    }

    rate->bytes_sent += samples << info->shift;

    return samples;

}

/* playback */

static int line_out_init (HWVoiceOut *hw, struct audsettings *as)

{

    SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);

    struct audsettings settings;

    settings.freq       = SPICE_INTERFACE_PLAYBACK_FREQ;

    settings.nchannels  = SPICE_INTERFACE_PLAYBACK_CHAN;

    settings.fmt        = AUD_FMT_S16;

    settings.endianness = AUDIO_HOST_ENDIANNESS;

    audio_pcm_init_info (&hw->info, &settings);

    hw->samples = LINE_OUT_SAMPLES;

    out->active = 0;

    out->sin.base.sif = &playback_sif.base;

    qemu_spice_add_interface (&out->sin.base);

    return 0;

}

static void line_out_fini (HWVoiceOut *hw)

{

    SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);

    spice_server_remove_interface (&out->sin.base);

}

static int line_out_run (HWVoiceOut *hw, int live)

{

    SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);

    int rpos, decr;

    int samples;

    if (!live) {

        return 0;

    }

    decr = rate_get_samples (&hw->info, &out->rate);

    decr = audio_MIN (live, decr);

    samples = decr;

    rpos = hw->rpos;

    while (samples) {

        int left_till_end_samples = hw->samples - rpos;

        int len = audio_MIN (samples, left_till_end_samples);

        if (!out->frame) {

            spice_server_playback_get_buffer (&out->sin, &out->frame, &out->fsize);

            out->fpos = out->frame;

        }

        if (out->frame) {

            len = audio_MIN (len, out->fsize);

            hw->clip (out->fpos, hw->mix_buf + rpos, len);

            out->fsize -= len;

            out->fpos  += len;

            if (out->fsize == 0) {

                spice_server_playback_put_samples (&out->sin, out->frame);

                out->frame = out->fpos = NULL;

            }

        }

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

        samples -= len;

    }

    hw->rpos = rpos;

    return decr;

}

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

{

    return audio_pcm_sw_write (sw, buf, len);

}

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

{

    SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);

    switch (cmd) {

    case VOICE_ENABLE:

        if (out->active) {

            break;

        }

        out->active = 1;

        rate_start (&out->rate);

        spice_server_playback_start (&out->sin);

        break;

    case VOICE_DISABLE:

        if (!out->active) {

            break;

        }

        out->active = 0;

        if (out->frame) {

            memset (out->fpos, 0, out->fsize << 2);

            spice_server_playback_put_samples (&out->sin, out->frame);

            out->frame = out->fpos = NULL;

        }

        spice_server_playback_stop (&out->sin);

        break;

    }

    return 0;

}

/* record */

static int line_in_init (HWVoiceIn *hw, struct audsettings *as)

{

    SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);

    struct audsettings settings;

    settings.freq       = SPICE_INTERFACE_RECORD_FREQ;

    settings.nchannels  = SPICE_INTERFACE_RECORD_CHAN;

    settings.fmt        = AUD_FMT_S16;

    settings.endianness = AUDIO_HOST_ENDIANNESS;

    audio_pcm_init_info (&hw->info, &settings);

    hw->samples = LINE_IN_SAMPLES;

    in->active = 0;

    in->sin.base.sif = &record_sif.base;

    qemu_spice_add_interface (&in->sin.base);

    return 0;

}

static void line_in_fini (HWVoiceIn *hw)

{

    SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);

    spice_server_remove_interface (&in->sin.base);

}

static int line_in_run (HWVoiceIn *hw)

{

    SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);

    int num_samples;

    int ready;

    int len[2];

    uint64_t delta_samp;

    const uint32_t *samples;

    if (!(num_samples = hw->samples - audio_pcm_hw_get_live_in (hw))) {

        return 0;

    }

    delta_samp = rate_get_samples (&hw->info, &in->rate);

    num_samples = audio_MIN (num_samples, delta_samp);

    ready = spice_server_record_get_samples (&in->sin, in->samples, num_samples);

    samples = in->samples;

    if (ready == 0) {

        static const uint32_t silence[LINE_IN_SAMPLES];

        samples = silence;

        ready = LINE_IN_SAMPLES;

    }

    num_samples = audio_MIN (ready, num_samples);

    if (hw->wpos + num_samples > hw->samples) {

        len[0] = hw->samples - hw->wpos;

        len[1] = num_samples - len[0];

    } else {

        len[0] = num_samples;

        len[1] = 0;

    }

    hw->conv (hw->conv_buf + hw->wpos, samples, len[0]);

    if (len[1]) {

        hw->conv (hw->conv_buf, samples + len[0], len[1]);

    }

    hw->wpos = (hw->wpos + num_samples) % hw->samples;

    return num_samples;

}

static int line_in_read (SWVoiceIn *sw, void *buf, int size)

{

    return audio_pcm_sw_read (sw, buf, size);

}

static int line_in_ctl (HWVoiceIn *hw, int cmd, ...)

{

    SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);

    switch (cmd) {

    case VOICE_ENABLE:

        if (in->active) {

            break;

        }

        in->active = 1;

        rate_start (&in->rate);

        spice_server_record_start (&in->sin);

        break;

    case VOICE_DISABLE:

        if (!in->active) {

            break;

        }

        in->active = 0;

        spice_server_record_stop (&in->sin);

        break;

    }

    return 0;

}

static struct audio_option audio_options[] = {

    { /* end of list */ },

};

static struct audio_pcm_ops audio_callbacks = {

    .init_out = line_out_init,

    .fini_out = line_out_fini,

    .run_out  = line_out_run,

    .write    = line_out_write,

    .ctl_out  = line_out_ctl,

    .init_in  = line_in_init,

    .fini_in  = line_in_fini,

    .run_in   = line_in_run,

    .read     = line_in_read,

    .ctl_in   = line_in_ctl,

};

struct audio_driver spice_audio_driver = {

    .name           = "spice",

    .descr          = "spice audio driver",

    .options        = audio_options,

    .init           = spice_audio_init,

    .fini           = spice_audio_fini,

    .pcm_ops        = &audio_callbacks,

    .max_voices_out = 1,

    .max_voices_in  = 1,

    .voice_size_out = sizeof (SpiceVoiceOut),

    .voice_size_in  = sizeof (SpiceVoiceIn),

};

void qemu_spice_audio_init (void)

{

    spice_audio_driver.can_be_default = 1;

}