spice: add audio

Add support for the spice audio interface.

The driver is first in the driver list, but can_be_default is set only
in case spice is active.  So if you are using spice the spice audio
driver is the default one, otherwise whatever comes first after spice in
the list.  Overriding the default using QEMU_AUDIO_DRV works in any
case.

1 files changed, 312 insertions, 0 deletions

diff --git a/audio/spiceaudio.c b/audio/spiceaudio.c
new file mode 100644
index 000000000..8ae749997
--- /dev/null
+++ b/audio/spiceaudio.c
@@ -0,0 +1,312 @@
+#include "hw/hw.h"
+#include "qemu-timer.h"
+#include "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 SpiceVoiceOut {
+    HWVoiceOut            hw;
+    SpicePlaybackInstance sin;
+    int64_t               prev_ticks;
+    int                   active;
+    uint32_t              *frame;
+    uint32_t              *fpos;
+    uint32_t              fsize;
+} SpiceVoiceOut;
+
+typedef struct SpiceVoiceIn {
+    HWVoiceIn             hw;
+    SpiceRecordInstance   sin;
+    int64_t               prev_ticks;
+    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 int calculate_samples(struct audio_pcm_info *info, int64_t *old_ticks)
+{
+    int64_t now;
+    int64_t ticks;
+    int64_t bytes;
+    int samples;
+
+    now = qemu_get_clock (vm_clock);
+    ticks = now - *old_ticks;
+    *old_ticks = now;
+    bytes = muldiv64 (ticks, info->bytes_per_second, get_ticks_per_sec ());
+    bytes = audio_MIN (bytes, INT_MAX);
+    samples = bytes >> 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;
+    spice_server_add_interface(spice_server, &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 = calculate_samples(&hw->info, &out->prev_ticks);
+    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;
+        out->prev_ticks = qemu_get_clock (vm_clock);
+        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;
+    spice_server_add_interface(spice_server, &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;
+    uint32_t *samples;
+
+    if (!(num_samples = hw->samples - audio_pcm_hw_get_live_in(hw))) {
+        return 0;
+    }
+
+    delta_samp = calculate_samples(&hw->info, &in->prev_ticks);
+    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 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], &nominal_volume);
+
+    if (len[1]) {
+        hw->conv(hw->conv_buf, samples + len[0], len[1],
+                 &nominal_volume);
+    }
+
+    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;
+        in->prev_ticks = qemu_get_clock (vm_clock);
+        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;
+}