diff options
Diffstat (limited to 'src/vdagent-audio.c')
| -rw-r--r-- | src/vdagent-audio.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/vdagent-audio.c b/src/vdagent-audio.c new file mode 100644 index 0000000..6b11cd8 --- /dev/null +++ b/src/vdagent-audio.c @@ -0,0 +1,168 @@ +/* vdagent-audio.c vdagentd audio handling code + + Copyright 2015 Red Hat, Inc. + + 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 3 of the License, or + (at your option) any later version. + + 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/>. +*/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <glib.h> +#include <syslog.h> +#include <stdbool.h> +#include <alsa/asoundlib.h> +#include <alsa/mixer.h> +#include <alsa/error.h> +#include "vdagent-audio.h" + +#define ALSA_MUTE 0 +#define ALSA_UNMUTE 1 + +static snd_mixer_elem_t * +get_alsa_default_mixer_by_name(snd_mixer_t **handle, const char *name) +{ + snd_mixer_selem_id_t *sid; + int err = 0; + + if ((err = snd_mixer_open(handle, 0)) < 0) + goto fail; + + if ((err = snd_mixer_attach(*handle, "default")) < 0) + goto fail; + + if ((err = snd_mixer_selem_register(*handle, NULL, NULL)) < 0) + goto fail; + + if ((err = snd_mixer_load(*handle)) < 0) + goto fail; + + snd_mixer_selem_id_alloca(&sid); + snd_mixer_selem_id_set_index(sid, 0); + snd_mixer_selem_id_set_name(sid, name); + return snd_mixer_find_selem(*handle, sid); + +fail: + syslog(LOG_WARNING, "%s fail: %s", __func__, snd_strerror(err)); + return NULL; +} + +static bool set_alsa_capture(uint8_t mute, uint8_t nchannels, uint16_t *volume) +{ + snd_mixer_t *handle = NULL; + snd_mixer_elem_t *e; + long min, max, vol; + bool ret = true; + int alsa_mute; + + e = get_alsa_default_mixer_by_name (&handle, "Capture"); + if (e == NULL) { + syslog(LOG_WARNING, "vdagent-audio: can't get default alsa mixer"); + ret = false; + goto end; + } + + alsa_mute = (mute) ? ALSA_MUTE : ALSA_UNMUTE; + snd_mixer_selem_set_capture_switch_all(e, alsa_mute); + + snd_mixer_selem_get_capture_volume_range(e, &min, &max); + switch (nchannels) { + case 1: /* MONO */ + vol = CLAMP(volume[0], min, max); + snd_mixer_selem_set_capture_volume(e, SND_MIXER_SCHN_MONO, vol); + syslog(LOG_DEBUG, "vdagent-audio: (capture-mono) %lu (%%%0.2f)", + vol, (float) (100*vol/max)); + break; + case 2: /* LEFT-RIGHT */ + vol = CLAMP(volume[0], min, max); + snd_mixer_selem_set_capture_volume(e, SND_MIXER_SCHN_FRONT_LEFT, vol); + syslog(LOG_DEBUG, "vdagent-audio: (capture-left) %lu (%%%0.2f)", + vol, (float) (100*vol/max)); + vol = CLAMP(volume[1], min, max); + snd_mixer_selem_set_capture_volume(e, SND_MIXER_SCHN_FRONT_RIGHT, vol); + syslog(LOG_DEBUG, "vdagent-audio: (capture-right) %lu (%%%0.2f)", + vol, (float) (100*vol/max)); + break; + default: + syslog(LOG_WARNING, "vdagent-audio: number of channels not supported"); + ret = false; + } +end: + if (handle != NULL) + snd_mixer_close(handle); + return ret; +} + +static bool set_alsa_playback (uint8_t mute, uint8_t nchannels, uint16_t *volume) +{ + snd_mixer_t *handle = NULL; + snd_mixer_elem_t* e; + long min, max, vol; + bool ret = true; + int alsa_mute; + + e = get_alsa_default_mixer_by_name (&handle, "Master"); + if (e == NULL) { + syslog(LOG_WARNING, "vdagent-audio: can't get default alsa mixer"); + ret = false; + goto end; + } + + alsa_mute = (mute) ? ALSA_MUTE : ALSA_UNMUTE; + snd_mixer_selem_set_playback_switch_all(e, alsa_mute); + + snd_mixer_selem_get_playback_volume_range(e, &min, &max); + switch (nchannels) { + case 1: /* MONO */ + vol = CLAMP(volume[0], min, max); + snd_mixer_selem_set_playback_volume(e, SND_MIXER_SCHN_MONO, vol); + syslog(LOG_DEBUG, "vdagent-audio: (playback-mono) %lu (%%%0.2f)", + vol, (float) (100*vol/max)); + break; + case 2: /* LEFT-RIGHT */ + vol = CLAMP(volume[0], min, max); + snd_mixer_selem_set_playback_volume(e, SND_MIXER_SCHN_FRONT_LEFT, vol); + syslog(LOG_DEBUG, "vdagent-audio: (playback-left) %lu (%%%0.2f)", + vol, (float) (100*vol/max)); + vol = CLAMP(volume[1], min, max); + snd_mixer_selem_set_playback_volume(e, SND_MIXER_SCHN_FRONT_RIGHT, vol); + syslog(LOG_DEBUG, "vdagent-audio: (playback-right) %lu (%%%0.2f)", + vol, (float) (100*vol/max)); + break; + default: + syslog(LOG_WARNING, "vdagent-audio: number of channels not supported"); + ret = false; + } +end: + if (handle != NULL) + snd_mixer_close(handle); + return ret; +} + +void vdagent_audio_playback_sync(uint8_t mute, uint8_t nchannels, uint16_t *volume) +{ + syslog(LOG_DEBUG, "%s mute=%s nchannels=%u", + __func__, (mute) ? "yes" : "no", nchannels); + if (set_alsa_playback (mute, nchannels, volume) == false) + syslog(LOG_WARNING, "Fail to sync playback volume"); +} + +void vdagent_audio_record_sync(uint8_t mute, uint8_t nchannels, uint16_t *volume) +{ + syslog(LOG_DEBUG, "%s mute=%s nchannels=%u", + __func__, (mute) ? "yes" : "no", nchannels); + if (set_alsa_capture (mute, nchannels, volume) == false) + syslog(LOG_WARNING, "Fail to sync record volume"); +} |