audio/spiceaudio.c

   1 /*
   2  * Copyright (C) 2010 Red Hat, Inc.
   3  *
   4  * maintained by Gerd Hoffmann <kraxel@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 or
   9  * (at your option) version 3 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw/hw.h"
  21 #include "qemu-timer.h"
  22 #include "ui/qemu-spice.h"
  23
  24 #define AUDIO_CAP "spice"
  25 #include "audio.h"
  26 #include "audio_int.h"
  27
  28 #define LINE_IN_SAMPLES 1024
  29 #define LINE_OUT_SAMPLES 1024
  30
  31 typedef struct SpiceRateCtl {
  32     int64_t               start_ticks;
  33     int64_t               bytes_sent;
  34 } SpiceRateCtl;
  35
  36 typedef struct SpiceVoiceOut {
  37     HWVoiceOut            hw;
  38     SpicePlaybackInstance sin;
  39     SpiceRateCtl          rate;
  40     int                   active;
  41     uint32_t              *frame;
  42     uint32_t              *fpos;
  43     uint32_t              fsize;
  44 } SpiceVoiceOut;
  45
  46 typedef struct SpiceVoiceIn {
  47     HWVoiceIn             hw;
  48     SpiceRecordInstance   sin;
  49     SpiceRateCtl          rate;
  50     int                   active;
  51     uint32_t              samples[LINE_IN_SAMPLES];
  52 } SpiceVoiceIn;
  53
  54 static const SpicePlaybackInterface playback_sif = {
  55     .base.type          = SPICE_INTERFACE_PLAYBACK,
  56     .base.description   = "playback",
  57     .base.major_version = SPICE_INTERFACE_PLAYBACK_MAJOR,
  58     .base.minor_version = SPICE_INTERFACE_PLAYBACK_MINOR,
  59 };
  60
  61 static const SpiceRecordInterface record_sif = {
  62     .base.type          = SPICE_INTERFACE_RECORD,
  63     .base.description   = "record",
  64     .base.major_version = SPICE_INTERFACE_RECORD_MAJOR,
  65     .base.minor_version = SPICE_INTERFACE_RECORD_MINOR,
  66 };
  67
  68 static void *spice_audio_init (void)
  69 {
  70     if (!using_spice) {
  71         return NULL;
  72     }
  73     return &spice_audio_init;
  74 }
  75
  76 static void spice_audio_fini (void *opaque)
  77 {
  78     /* nothing */
  79 }
  80
  81 static void rate_start (SpiceRateCtl *rate)
  82 {
  83     memset (rate, 0, sizeof (*rate));
  84     rate->start_ticks = qemu_get_clock (vm_clock);
  85 }
  86
  87 static int rate_get_samples (struct audio_pcm_info *info, SpiceRateCtl *rate)
  88 {
  89     int64_t now;
  90     int64_t ticks;
  91     int64_t bytes;
  92     int64_t samples;
  93
  94     now = qemu_get_clock (vm_clock);
  95     ticks = now - rate->start_ticks;
  96     bytes = muldiv64 (ticks, info->bytes_per_second, get_ticks_per_sec ());
  97     samples = (bytes - rate->bytes_sent) >> info->shift;
  98     if (samples < 0 || samples > 65536) {
  99         fprintf (stderr, "Resetting rate control (%" PRId64 " samples)\n", samples);
 100         rate_start (rate);
 101         samples = 0;
 102     }
 103     rate->bytes_sent += samples << info->shift;
 104     return samples;
 105 }
 106
 107 /* playback */
 108
 109 static int line_out_init (HWVoiceOut *hw, struct audsettings *as)
 110 {
 111     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
 112     struct audsettings settings;
 113
 114     settings.freq       = SPICE_INTERFACE_PLAYBACK_FREQ;
 115     settings.nchannels  = SPICE_INTERFACE_PLAYBACK_CHAN;
 116     settings.fmt        = AUD_FMT_S16;
 117     settings.endianness = AUDIO_HOST_ENDIANNESS;
 118
 119     audio_pcm_init_info (&hw->info, &settings);
 120     hw->samples = LINE_OUT_SAMPLES;
 121     out->active = 0;
 122
 123     out->sin.base.sif = &playback_sif.base;
 124     qemu_spice_add_interface (&out->sin.base);
 125     return 0;
 126 }
 127
 128 static void line_out_fini (HWVoiceOut *hw)
 129 {
 130     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
 131
 132     spice_server_remove_interface (&out->sin.base);
 133 }
 134
 135 static int line_out_run (HWVoiceOut *hw, int live)
 136 {
 137     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
 138     int rpos, decr;
 139     int samples;
 140
 141     if (!live) {
 142         return 0;
 143     }
 144
 145     decr = rate_get_samples (&hw->info, &out->rate);
 146     decr = audio_MIN (live, decr);
 147
 148     samples = decr;
 149     rpos = hw->rpos;
 150     while (samples) {
 151         int left_till_end_samples = hw->samples - rpos;
 152         int len = audio_MIN (samples, left_till_end_samples);
 153
 154         if (!out->frame) {
 155             spice_server_playback_get_buffer (&out->sin, &out->frame, &out->fsize);
 156             out->fpos = out->frame;
 157         }
 158         if (out->frame) {
 159             len = audio_MIN (len, out->fsize);
 160             hw->clip (out->fpos, hw->mix_buf + rpos, len);
 161             out->fsize -= len;
 162             out->fpos  += len;
 163             if (out->fsize == 0) {
 164                 spice_server_playback_put_samples (&out->sin, out->frame);
 165                 out->frame = out->fpos = NULL;
 166             }
 167         }
 168         rpos = (rpos + len) % hw->samples;
 169         samples -= len;
 170     }
 171     hw->rpos = rpos;
 172     return decr;
 173 }
 174
 175 static int line_out_write (SWVoiceOut *sw, void *buf, int len)
 176 {
 177     return audio_pcm_sw_write (sw, buf, len);
 178 }
 179
 180 static int line_out_ctl (HWVoiceOut *hw, int cmd, ...)
 181 {
 182     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
 183
 184     switch (cmd) {
 185     case VOICE_ENABLE:
 186         if (out->active) {
 187             break;
 188         }
 189         out->active = 1;
 190         rate_start (&out->rate);
 191         spice_server_playback_start (&out->sin);
 192         break;
 193     case VOICE_DISABLE:
 194         if (!out->active) {
 195             break;
 196         }
 197         out->active = 0;
 198         if (out->frame) {
 199             memset (out->fpos, 0, out->fsize << 2);
 200             spice_server_playback_put_samples (&out->sin, out->frame);
 201             out->frame = out->fpos = NULL;
 202         }
 203         spice_server_playback_stop (&out->sin);
 204         break;
 205     }
 206     return 0;
 207 }
 208
 209 /* record */
 210
 211 static int line_in_init (HWVoiceIn *hw, struct audsettings *as)
 212 {
 213     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
 214     struct audsettings settings;
 215
 216     settings.freq       = SPICE_INTERFACE_RECORD_FREQ;
 217     settings.nchannels  = SPICE_INTERFACE_RECORD_CHAN;
 218     settings.fmt        = AUD_FMT_S16;
 219     settings.endianness = AUDIO_HOST_ENDIANNESS;
 220
 221     audio_pcm_init_info (&hw->info, &settings);
 222     hw->samples = LINE_IN_SAMPLES;
 223     in->active = 0;
 224
 225     in->sin.base.sif = &record_sif.base;
 226     qemu_spice_add_interface (&in->sin.base);
 227     return 0;
 228 }
 229
 230 static void line_in_fini (HWVoiceIn *hw)
 231 {
 232     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
 233
 234     spice_server_remove_interface (&in->sin.base);
 235 }
 236
 237 static int line_in_run (HWVoiceIn *hw)
 238 {
 239     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
 240     int num_samples;
 241     int ready;
 242     int len[2];
 243     uint64_t delta_samp;
 244     const uint32_t *samples;
 245
 246     if (!(num_samples = hw->samples - audio_pcm_hw_get_live_in (hw))) {
 247         return 0;
 248     }
 249
 250     delta_samp = rate_get_samples (&hw->info, &in->rate);
 251     num_samples = audio_MIN (num_samples, delta_samp);
 252
 253     ready = spice_server_record_get_samples (&in->sin, in->samples, num_samples);
 254     samples = in->samples;
 255     if (ready == 0) {
 256         static const uint32_t silence[LINE_IN_SAMPLES];
 257         samples = silence;
 258         ready = LINE_IN_SAMPLES;
 259     }
 260
 261     num_samples = audio_MIN (ready, num_samples);
 262
 263     if (hw->wpos + num_samples > hw->samples) {
 264         len[0] = hw->samples - hw->wpos;
 265         len[1] = num_samples - len[0];
 266     } else {
 267         len[0] = num_samples;
 268         len[1] = 0;
 269     }
 270
 271     hw->conv (hw->conv_buf + hw->wpos, samples, len[0], &nominal_volume);
 272
 273     if (len[1]) {
 274         hw->conv (hw->conv_buf, samples + len[0], len[1],
 275                   &nominal_volume);
 276     }
 277
 278     hw->wpos = (hw->wpos + num_samples) % hw->samples;
 279
 280     return num_samples;
 281 }
 282
 283 static int line_in_read (SWVoiceIn *sw, void *buf, int size)
 284 {
 285     return audio_pcm_sw_read (sw, buf, size);
 286 }
 287
 288 static int line_in_ctl (HWVoiceIn *hw, int cmd, ...)
 289 {
 290     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
 291
 292     switch (cmd) {
 293     case VOICE_ENABLE:
 294         if (in->active) {
 295             break;
 296         }
 297         in->active = 1;
 298         rate_start (&in->rate);
 299         spice_server_record_start (&in->sin);
 300         break;
 301     case VOICE_DISABLE:
 302         if (!in->active) {
 303             break;
 304         }
 305         in->active = 0;
 306         spice_server_record_stop (&in->sin);
 307         break;
 308     }
 309     return 0;
 310 }
 311
 312 static struct audio_option audio_options[] = {
 313     { /* end of list */ },
 314 };
 315
 316 static struct audio_pcm_ops audio_callbacks = {
 317     .init_out = line_out_init,
 318     .fini_out = line_out_fini,
 319     .run_out  = line_out_run,
 320     .write    = line_out_write,
 321     .ctl_out  = line_out_ctl,
 322
 323     .init_in  = line_in_init,
 324     .fini_in  = line_in_fini,
 325     .run_in   = line_in_run,
 326     .read     = line_in_read,
 327     .ctl_in   = line_in_ctl,
 328 };
 329
 330 struct audio_driver spice_audio_driver = {
 331     .name           = "spice",
 332     .descr          = "spice audio driver",
 333     .options        = audio_options,
 334     .init           = spice_audio_init,
 335     .fini           = spice_audio_fini,
 336     .pcm_ops        = &audio_callbacks,
 337     .max_voices_out = 1,
 338     .max_voices_in  = 1,
 339     .voice_size_out = sizeof (SpiceVoiceOut),
 340     .voice_size_in  = sizeof (SpiceVoiceIn),
 341 };
 342
 343 void qemu_spice_audio_init (void)
 344 {
 345     spice_audio_driver.can_be_default = 1;
 346 }