xref: /openbmc/qemu/audio/spiceaudio.c (revision 764a6ee9)
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 "qemu/osdep.h"
21 #include "qemu/host-utils.h"
22 #include "qemu/module.h"
23 #include "qemu/error-report.h"
24 #include "qemu/timer.h"
25 #include "qapi/error.h"
26 #include "ui/qemu-spice.h"
27 
28 #define AUDIO_CAP "spice"
29 #include "audio.h"
30 #include "audio_int.h"
31 
32 #if SPICE_INTERFACE_PLAYBACK_MAJOR > 1 || SPICE_INTERFACE_PLAYBACK_MINOR >= 3
33 #define LINE_OUT_SAMPLES (480 * 4)
34 #else
35 #define LINE_OUT_SAMPLES (256 * 4)
36 #endif
37 
38 #if SPICE_INTERFACE_RECORD_MAJOR > 2 || SPICE_INTERFACE_RECORD_MINOR >= 3
39 #define LINE_IN_SAMPLES (480 * 4)
40 #else
41 #define LINE_IN_SAMPLES (256 * 4)
42 #endif
43 
44 typedef struct SpiceVoiceOut {
45     HWVoiceOut            hw;
46     SpicePlaybackInstance sin;
47     RateCtl               rate;
48     int                   active;
49     uint32_t              *frame;
50     uint32_t              fpos;
51     uint32_t              fsize;
52 } SpiceVoiceOut;
53 
54 typedef struct SpiceVoiceIn {
55     HWVoiceIn             hw;
56     SpiceRecordInstance   sin;
57     RateCtl               rate;
58     int                   active;
59 } SpiceVoiceIn;
60 
61 static const SpicePlaybackInterface playback_sif = {
62     .base.type          = SPICE_INTERFACE_PLAYBACK,
63     .base.description   = "playback",
64     .base.major_version = SPICE_INTERFACE_PLAYBACK_MAJOR,
65     .base.minor_version = SPICE_INTERFACE_PLAYBACK_MINOR,
66 };
67 
68 static const SpiceRecordInterface record_sif = {
69     .base.type          = SPICE_INTERFACE_RECORD,
70     .base.description   = "record",
71     .base.major_version = SPICE_INTERFACE_RECORD_MAJOR,
72     .base.minor_version = SPICE_INTERFACE_RECORD_MINOR,
73 };
74 
75 static void *spice_audio_init(Audiodev *dev, Error **errp)
76 {
77     if (!using_spice) {
78         error_setg(errp, "Cannot use spice audio without -spice");
79         return NULL;
80     }
81 
82     return &spice_audio_init;
83 }
84 
85 static void spice_audio_fini (void *opaque)
86 {
87     /* nothing */
88 }
89 
90 /* playback */
91 
92 static int line_out_init(HWVoiceOut *hw, struct audsettings *as,
93                          void *drv_opaque)
94 {
95     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
96     struct audsettings settings;
97 
98 #if SPICE_INTERFACE_PLAYBACK_MAJOR > 1 || SPICE_INTERFACE_PLAYBACK_MINOR >= 3
99     settings.freq       = spice_server_get_best_playback_rate(NULL);
100 #else
101     settings.freq       = SPICE_INTERFACE_PLAYBACK_FREQ;
102 #endif
103     settings.nchannels  = SPICE_INTERFACE_PLAYBACK_CHAN;
104     settings.fmt        = AUDIO_FORMAT_S16;
105     settings.endianness = AUDIO_HOST_ENDIANNESS;
106 
107     audio_pcm_init_info (&hw->info, &settings);
108     hw->samples = LINE_OUT_SAMPLES;
109     out->active = 0;
110 
111     out->sin.base.sif = &playback_sif.base;
112     qemu_spice.add_interface(&out->sin.base);
113 #if SPICE_INTERFACE_PLAYBACK_MAJOR > 1 || SPICE_INTERFACE_PLAYBACK_MINOR >= 3
114     spice_server_set_playback_rate(&out->sin, settings.freq);
115 #endif
116     return 0;
117 }
118 
119 static void line_out_fini (HWVoiceOut *hw)
120 {
121     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
122 
123     spice_server_remove_interface (&out->sin.base);
124 }
125 
126 static size_t line_out_get_free(HWVoiceOut *hw)
127 {
128     SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
129 
130     return audio_rate_peek_bytes(&out->rate, &hw->info);
131 }
132 
133 static void *line_out_get_buffer(HWVoiceOut *hw, size_t *size)
134 {
135     SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
136 
137     if (!out->frame) {
138         spice_server_playback_get_buffer(&out->sin, &out->frame, &out->fsize);
139         out->fpos = 0;
140     }
141 
142     if (out->frame) {
143         *size = MIN((out->fsize - out->fpos) << 2, *size);
144     }
145 
146     return out->frame + out->fpos;
147 }
148 
149 static size_t line_out_put_buffer(HWVoiceOut *hw, void *buf, size_t size)
150 {
151     SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
152 
153     audio_rate_add_bytes(&out->rate, size);
154 
155     if (buf) {
156         assert(buf == out->frame + out->fpos && out->fpos <= out->fsize);
157         out->fpos += size >> 2;
158 
159         if (out->fpos == out->fsize) { /* buffer full */
160             spice_server_playback_put_samples(&out->sin, out->frame);
161             out->frame = NULL;
162         }
163     }
164 
165     return size;
166 }
167 
168 static void line_out_enable(HWVoiceOut *hw, bool enable)
169 {
170     SpiceVoiceOut *out = container_of (hw, SpiceVoiceOut, hw);
171 
172     if (enable) {
173         if (out->active) {
174             return;
175         }
176         out->active = 1;
177         audio_rate_start(&out->rate);
178         spice_server_playback_start (&out->sin);
179     } else {
180         if (!out->active) {
181             return;
182         }
183         out->active = 0;
184         if (out->frame) {
185             memset(out->frame + out->fpos, 0, (out->fsize - out->fpos) << 2);
186             spice_server_playback_put_samples (&out->sin, out->frame);
187             out->frame = NULL;
188         }
189         spice_server_playback_stop (&out->sin);
190     }
191 }
192 
193 #if ((SPICE_INTERFACE_PLAYBACK_MAJOR >= 1) && (SPICE_INTERFACE_PLAYBACK_MINOR >= 2))
194 static void line_out_volume(HWVoiceOut *hw, Volume *vol)
195 {
196     SpiceVoiceOut *out = container_of(hw, SpiceVoiceOut, hw);
197     uint16_t svol[2];
198 
199     assert(vol->channels == 2);
200     svol[0] = vol->vol[0] * 257;
201     svol[1] = vol->vol[1] * 257;
202     spice_server_playback_set_volume(&out->sin, 2, svol);
203     spice_server_playback_set_mute(&out->sin, vol->mute);
204 }
205 #endif
206 
207 /* record */
208 
209 static int line_in_init(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
210 {
211     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
212     struct audsettings settings;
213 
214 #if SPICE_INTERFACE_RECORD_MAJOR > 2 || SPICE_INTERFACE_RECORD_MINOR >= 3
215     settings.freq       = spice_server_get_best_record_rate(NULL);
216 #else
217     settings.freq       = SPICE_INTERFACE_RECORD_FREQ;
218 #endif
219     settings.nchannels  = SPICE_INTERFACE_RECORD_CHAN;
220     settings.fmt        = AUDIO_FORMAT_S16;
221     settings.endianness = AUDIO_HOST_ENDIANNESS;
222 
223     audio_pcm_init_info (&hw->info, &settings);
224     hw->samples = LINE_IN_SAMPLES;
225     in->active = 0;
226 
227     in->sin.base.sif = &record_sif.base;
228     qemu_spice.add_interface(&in->sin.base);
229 #if SPICE_INTERFACE_RECORD_MAJOR > 2 || SPICE_INTERFACE_RECORD_MINOR >= 3
230     spice_server_set_record_rate(&in->sin, settings.freq);
231 #endif
232     return 0;
233 }
234 
235 static void line_in_fini (HWVoiceIn *hw)
236 {
237     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
238 
239     spice_server_remove_interface (&in->sin.base);
240 }
241 
242 static size_t line_in_read(HWVoiceIn *hw, void *buf, size_t len)
243 {
244     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
245     uint64_t to_read = audio_rate_get_bytes(&in->rate, &hw->info, len) >> 2;
246     size_t ready = spice_server_record_get_samples(&in->sin, buf, to_read);
247 
248     /*
249      * If the client didn't send new frames, it most likely disconnected.
250      * Generate silence in this case to avoid a stalled audio stream.
251      */
252     if (ready == 0) {
253         memset(buf, 0, to_read << 2);
254         ready = to_read;
255     }
256 
257     return ready << 2;
258 }
259 
260 static void line_in_enable(HWVoiceIn *hw, bool enable)
261 {
262     SpiceVoiceIn *in = container_of (hw, SpiceVoiceIn, hw);
263 
264     if (enable) {
265         if (in->active) {
266             return;
267         }
268         in->active = 1;
269         audio_rate_start(&in->rate);
270         spice_server_record_start (&in->sin);
271     } else {
272         if (!in->active) {
273             return;
274         }
275         in->active = 0;
276         spice_server_record_stop (&in->sin);
277     }
278 }
279 
280 #if ((SPICE_INTERFACE_RECORD_MAJOR >= 2) && (SPICE_INTERFACE_RECORD_MINOR >= 2))
281 static void line_in_volume(HWVoiceIn *hw, Volume *vol)
282 {
283     SpiceVoiceIn *in = container_of(hw, SpiceVoiceIn, hw);
284     uint16_t svol[2];
285 
286     assert(vol->channels == 2);
287     svol[0] = vol->vol[0] * 257;
288     svol[1] = vol->vol[1] * 257;
289     spice_server_record_set_volume(&in->sin, 2, svol);
290     spice_server_record_set_mute(&in->sin, vol->mute);
291 }
292 #endif
293 
294 static struct audio_pcm_ops audio_callbacks = {
295     .init_out = line_out_init,
296     .fini_out = line_out_fini,
297     .write    = audio_generic_write,
298     .buffer_get_free = line_out_get_free,
299     .get_buffer_out = line_out_get_buffer,
300     .put_buffer_out = line_out_put_buffer,
301     .enable_out = line_out_enable,
302 #if (SPICE_INTERFACE_PLAYBACK_MAJOR >= 1) && \
303         (SPICE_INTERFACE_PLAYBACK_MINOR >= 2)
304     .volume_out = line_out_volume,
305 #endif
306 
307     .init_in  = line_in_init,
308     .fini_in  = line_in_fini,
309     .read     = line_in_read,
310     .run_buffer_in = audio_generic_run_buffer_in,
311     .enable_in = line_in_enable,
312 #if ((SPICE_INTERFACE_RECORD_MAJOR >= 2) && (SPICE_INTERFACE_RECORD_MINOR >= 2))
313     .volume_in = line_in_volume,
314 #endif
315 };
316 
317 static struct audio_driver spice_audio_driver = {
318     .name           = "spice",
319     .descr          = "spice audio driver",
320     .init           = spice_audio_init,
321     .fini           = spice_audio_fini,
322     .pcm_ops        = &audio_callbacks,
323     .max_voices_out = 1,
324     .max_voices_in  = 1,
325     .voice_size_out = sizeof (SpiceVoiceOut),
326     .voice_size_in  = sizeof (SpiceVoiceIn),
327 };
328 
329 static void register_audio_spice(void)
330 {
331     audio_driver_register(&spice_audio_driver);
332 }
333 type_init(register_audio_spice);
334 
335 module_dep("ui-spice-core");
336