diff options
Diffstat (limited to 'qemu/audio/noaudio.c')
| -rw-r--r-- | qemu/audio/noaudio.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/qemu/audio/noaudio.c b/qemu/audio/noaudio.c new file mode 100644 index 000000000..50db1f344 --- /dev/null +++ b/qemu/audio/noaudio.c @@ -0,0 +1,173 @@ +/* + * QEMU Timer based audio emulation + * + * Copyright (c) 2004-2005 Vassili Karpov (malc) + * + * 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 "qemu-common.h" +#include "audio.h" +#include "qemu/timer.h" + +#define AUDIO_CAP "noaudio" +#include "audio_int.h" + +typedef struct NoVoiceOut { + HWVoiceOut hw; + int64_t old_ticks; +} NoVoiceOut; + +typedef struct NoVoiceIn { + HWVoiceIn hw; + int64_t old_ticks; +} NoVoiceIn; + +static int no_run_out (HWVoiceOut *hw, int live) +{ + NoVoiceOut *no = (NoVoiceOut *) hw; + int decr, samples; + int64_t now; + int64_t ticks; + int64_t bytes; + + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + ticks = now - no->old_ticks; + bytes = muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ()); + bytes = audio_MIN (bytes, INT_MAX); + samples = bytes >> hw->info.shift; + + no->old_ticks = now; + decr = audio_MIN (live, samples); + hw->rpos = (hw->rpos + decr) % hw->samples; + return decr; +} + +static int no_write (SWVoiceOut *sw, void *buf, int len) +{ + return audio_pcm_sw_write (sw, buf, len); +} + +static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque) +{ + audio_pcm_init_info (&hw->info, as); + hw->samples = 1024; + return 0; +} + +static void no_fini_out (HWVoiceOut *hw) +{ + (void) hw; +} + +static int no_ctl_out (HWVoiceOut *hw, int cmd, ...) +{ + (void) hw; + (void) cmd; + return 0; +} + +static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque) +{ + audio_pcm_init_info (&hw->info, as); + hw->samples = 1024; + return 0; +} + +static void no_fini_in (HWVoiceIn *hw) +{ + (void) hw; +} + +static int no_run_in (HWVoiceIn *hw) +{ + NoVoiceIn *no = (NoVoiceIn *) hw; + int live = audio_pcm_hw_get_live_in (hw); + int dead = hw->samples - live; + int samples = 0; + + if (dead) { + int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + int64_t ticks = now - no->old_ticks; + int64_t bytes = + muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ()); + + no->old_ticks = now; + bytes = audio_MIN (bytes, INT_MAX); + samples = bytes >> hw->info.shift; + samples = audio_MIN (samples, dead); + } + return samples; +} + +static int no_read (SWVoiceIn *sw, void *buf, int size) +{ + /* use custom code here instead of audio_pcm_sw_read() to avoid + * useless resampling/mixing */ + int samples = size >> sw->info.shift; + int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired; + int to_clear = audio_MIN (samples, total); + sw->total_hw_samples_acquired += total; + audio_pcm_info_clear_buf (&sw->info, buf, to_clear); + return to_clear << sw->info.shift; +} + +static int no_ctl_in (HWVoiceIn *hw, int cmd, ...) +{ + (void) hw; + (void) cmd; + return 0; +} + +static void *no_audio_init (void) +{ + return &no_audio_init; +} + +static void no_audio_fini (void *opaque) +{ + (void) opaque; +} + +static struct audio_pcm_ops no_pcm_ops = { + .init_out = no_init_out, + .fini_out = no_fini_out, + .run_out = no_run_out, + .write = no_write, + .ctl_out = no_ctl_out, + + .init_in = no_init_in, + .fini_in = no_fini_in, + .run_in = no_run_in, + .read = no_read, + .ctl_in = no_ctl_in +}; + +struct audio_driver no_audio_driver = { + .name = "none", + .descr = "Timer based audio emulation", + .options = NULL, + .init = no_audio_init, + .fini = no_audio_fini, + .pcm_ops = &no_pcm_ops, + .can_be_default = 1, + .max_voices_out = INT_MAX, + .max_voices_in = INT_MAX, + .voice_size_out = sizeof (NoVoiceOut), + .voice_size_in = sizeof (NoVoiceIn) +}; |