Re: [vdagent-linux PATCH 1/2] audio: add functions to set volume/mute with pulse

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Hi

----- Original Message -----
> This patch includes the vdagentd-audio.[ch] files in order to
> communicate with backend audio server.
> 
> The two functions provide a way to set volume and mute in the guest by
> creating a temporary mainloop and requesting the changes to pulse
> server.

Not sure PulseAudio API is best choice for modifying device volume, I would have used ALSA mixer API here (PulseAudio is fine synchronizing with ALSA changes)
 
> ---
>  Makefile.am          |   6 +-
>  configure.ac         |   1 +
>  src/vdagentd-audio.c | 250
>  +++++++++++++++++++++++++++++++++++++++++++++++++++
>  src/vdagentd-audio.h |  27 ++++++
>  4 files changed, 282 insertions(+), 2 deletions(-)
>  create mode 100644 src/vdagentd-audio.c
>  create mode 100644 src/vdagentd-audio.h
> 
> diff --git a/Makefile.am b/Makefile.am
> index 510f460..abd5b59 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -9,11 +9,12 @@ src_spice_vdagent_LDADD = $(X_LIBS) $(SPICE_LIBS)
> $(GLIB2_LIBS)
>  src_spice_vdagent_SOURCES = src/vdagent.c src/vdagent-x11.c
>  src/vdagent-x11-randr.c src/vdagent-file-xfers.c src/udscs.c
>  
>  src_spice_vdagentd_CFLAGS = $(DBUS_CFLAGS) $(LIBSYSTEMD_LOGIN_CFLAGS) \
> -  $(PCIACCESS_CFLAGS) $(SPICE_CFLAGS) $(GLIB2_CFLAGS) $(PIE_CFLAGS)
> +  $(PCIACCESS_CFLAGS) $(SPICE_CFLAGS) $(GLIB2_CFLAGS) $(PIE_CFLAGS)
> $(PULSE_CFLAGS)
>  src_spice_vdagentd_LDADD = $(DBUS_LIBS) $(LIBSYSTEMD_LOGIN_LIBS) \
> -  $(PCIACCESS_LIBS) $(SPICE_LIBS) $(GLIB2_LIBS) $(PIE_LDFLAGS)
> +  $(PCIACCESS_LIBS) $(SPICE_LIBS) $(GLIB2_LIBS) $(PIE_LDFLAGS) $(PULSE_LIBS)
>  src_spice_vdagentd_SOURCES = src/vdagentd.c \
>                               src/vdagentd-uinput.c \
> +                             src/vdagentd-audio.c \
>                               src/vdagentd-xorg-conf.c \
>                               src/vdagent-virtio-port.c \
>                               src/udscs.c
> @@ -37,6 +38,7 @@ noinst_HEADERS = src/glib-compat.h \
>                   src/vdagentd-proto.h \
>                   src/vdagentd-proto-strings.h \
>                   src/vdagentd-uinput.h \
> +                 src/vdagentd-audio.h \
>                   src/vdagentd-xorg-conf.h
>  
>  xdgautostartdir = $(sysconfdir)/xdg/autostart
> diff --git a/configure.ac b/configure.ac
> index 79905a8..6eb3e44 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -79,6 +79,7 @@ AC_ARG_ENABLE([static-uinput],
>  PKG_CHECK_MODULES([GLIB2], [glib-2.0 >= 2.12])
>  PKG_CHECK_MODULES(X, [xfixes xrandr >= 1.3 xinerama x11])
>  PKG_CHECK_MODULES(SPICE, [spice-protocol >= 0.12.5])
> +PKG_CHECK_MODULES(PULSE, [libpulse])
>  
>  if test "$with_session_info" = "auto" || test "$with_session_info" =
>  "systemd"; then
>      PKG_CHECK_MODULES([LIBSYSTEMD_LOGIN],
> diff --git a/src/vdagentd-audio.c b/src/vdagentd-audio.c
> new file mode 100644
> index 0000000..ca2a174
> --- /dev/null
> +++ b/src/vdagentd-audio.c
> @@ -0,0 +1,250 @@
> +/*  vdagentd-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 <syslog.h>
> +#include <pulse/pulseaudio.h>
> +#include <stdbool.h>
> +#include "vdagentd-audio.h"
> +
> +typedef enum {
> +    OP_PLAYBACK_SYNC,
> +    OP_RECORD_SYNC,
> +} operation;
> +
> +struct OperationSpec {
> +    pa_mainloop *mainloop;
> +    pa_context *context;
> +    operation op_type;
> +    bool mute;
> +    uint16_t nchannels;
> +    uint16_t *volume;
> +
> +    /* Only quit mainloop after all callbacks are called */
> +    int num_cb_operations;
> +};
> +
> +#define VDAGENT_APP "vdagentd-audio"
> +
> +static void context_success_cb (pa_context *c, int success, void *userdata)
> +{
> +    struct OperationSpec *os = userdata;
> +    int retval = (success) ? 0 : -1;
> +
> +    os->num_cb_operations--;
> +    syslog(LOG_DEBUG, "Num callback left: %d", os->num_cb_operations);
> +
> +    if (!success) {
> +        int err = pa_context_errno(os->context);
> +        syslog(LOG_WARNING, "Operation failed: %s", pa_strerror(err));
> +    }
> +
> +    if (os->num_cb_operations == 0)
> +        pa_mainloop_quit (os->mainloop, retval);
> +}
> +
> +static void vdagent_handle_operation (struct OperationSpec *os,
> +                                      uint8_t nchannels,
> +                                      const char *sink,
> +                                      const char *source)
> +{
> +    int i;
> +    pa_operation *op;
> +    pa_cvolume vol;
> +
> +    if (nchannels != os->nchannels)
> +        syslog (LOG_WARNING,
> +                "Number of channels in the guest (%u) and client (%u)
> differs",
> +                nchannels, os->nchannels);
> +
> +    pa_cvolume_init(&vol);
> +    vol.channels = nchannels;
> +    for (i = 0; i < nchannels; i++) {
> +        vol.values[i] = os->volume[i];
> +        syslog(LOG_DEBUG, "Setting channel %d to volume %d (%0.2f)",
> +               i, os->volume[i], (float) (100 * os->volume[i]) /
> UINT16_MAX);
> +    }
> +
> +    switch (os->op_type) {
> +    case OP_PLAYBACK_SYNC:
> +        os->num_cb_operations = 2;
> +        op = pa_context_set_sink_volume_by_name(os->context, sink, &vol,
> +                                                context_success_cb, os);
> +        if (!op) {
> +            int err = pa_context_errno(os->context);
> +            syslog(LOG_WARNING, "Fail to set sink volume: %s",
> pa_strerror(err));
> +            pa_mainloop_quit (os->mainloop, -1);
> +        }
> +        pa_operation_unref(op);
> +
> +        op = pa_context_set_sink_mute_by_name(os->context, sink, os->mute,
> +                                              context_success_cb, os);
> +        if (!op) {
> +            int err = pa_context_errno(os->context);
> +            syslog(LOG_WARNING, "Fail to set sink mute: %s",
> pa_strerror(err));
> +            pa_mainloop_quit (os->mainloop, -1);
> +        }
> +        pa_operation_unref(op);
> +        break;
> +
> +    case OP_RECORD_SYNC:
> +        os->num_cb_operations = 2;
> +        op = pa_context_set_source_volume_by_name(os->context, source, &vol,
> +                                                  context_success_cb, os);
> +        if (!op) {
> +            int err = pa_context_errno(os->context);
> +            syslog(LOG_WARNING, "Fail to set source volume: %s",
> pa_strerror(err));
> +            pa_mainloop_quit (os->mainloop, -1);
> +        }
> +        pa_operation_unref(op);
> +
> +        op = pa_context_set_source_mute_by_name(os->context, source,
> os->mute,
> +                                                context_success_cb, os);
> +        if (!op) {
> +            int err = pa_context_errno(os->context);
> +            syslog(LOG_WARNING, "Fail to set source mute: %s",
> pa_strerror(err));
> +            pa_mainloop_quit (os->mainloop, -1);
> +        }
> +        pa_operation_unref(op);
> +        break;
> +
> +    default:
> +        syslog(LOG_WARNING, "Unknown operation type %d, ignoring",
> os->op_type);
> +    }
> +}
> +
> +static void vdagent_server_info_cb (pa_context *context,
> +                                    const pa_server_info *info,
> +                                    void *userdata)
> +{
> +    vdagent_handle_operation (userdata,
> +                              info->channel_map.channels,
> +                              info->default_sink_name,
> +                              info->default_source_name);
> +}
> +
> +static void vdagent_context_state_cb(pa_context *context, void *userdata)
> +{
> +    struct OperationSpec *os = userdata;
> +    switch (pa_context_get_state(context)) {
> +    case PA_CONTEXT_UNCONNECTED:
> +    case PA_CONTEXT_CONNECTING:
> +    case PA_CONTEXT_AUTHORIZING:
> +    case PA_CONTEXT_SETTING_NAME:
> +        break;
> +
> +    case PA_CONTEXT_FAILED:
> +        syslog(LOG_WARNING, "The connection failed or was disconnected");
> +        goto fail;
> +        break;
> +
> +    case PA_CONTEXT_TERMINATED:
> +        syslog(LOG_WARNING, "The connection was terminated cleanly");
> +        goto fail;
> +        break;
> +
> +    case PA_CONTEXT_READY: {
> +        pa_operation *op;
> +        op = pa_context_get_server_info(context, vdagent_server_info_cb,
> userdata);
> +        if (!op) {
> +            int err = pa_context_errno(context);
> +            syslog(LOG_WARNING, "Fail to get server info: %s",
> pa_strerror(err));
> +            goto fail;
> +        }
> +        pa_operation_unref(op);
> +        break;
> +    }
> +    default:
> +       break;
> +    }
> +    return;
> +fail:
> +    if (os->mainloop != NULL) {
> +        syslog(LOG_WARNING, "Cancel operation and quit pulse mainloop");
> +        pa_mainloop_quit (os->mainloop, -1);
> +    }
> +}
> +
> +static bool vdagent_pulse_run (struct OperationSpec *os)
> +{
> +    pa_mainloop *loop;
> +    pa_mainloop_api *api;
> +    pa_context *context;
> +    int retval;
> +
> +    os->mainloop = NULL;
> +    loop = pa_mainloop_new();
> +    if (loop == NULL) {
> +        syslog(LOG_WARNING, "Fail to alloc pa_mainloop");
> +        return false;
> +    }
> +
> +    api = pa_mainloop_get_api(loop);
> +    if (api == NULL) {
> +        syslog(LOG_WARNING, "Fail to get mainloop_api");
> +        return false;
> +    }
> +
> +    context = pa_context_new(api, VDAGENT_APP);
> +    if (context == NULL) {
> +        syslog(LOG_WARNING, "Fail to alloc pa_context");
> +        return false;
> +    }
> +
> +    pa_context_set_state_callback(context, vdagent_context_state_cb, os);
> +    if (pa_context_connect(context, NULL, PA_CONTEXT_NOFLAGS, NULL) < 0) {
> +        syslog(LOG_WARNING, "Fail to connect to default server");
> +        pa_context_unref(context);
> +        return false;
> +    }
> +
> +    os->mainloop = loop;
> +    os->context = context;
> +    pa_mainloop_run(loop, &retval);
> +    pa_context_unref(context);
> +    return (retval == 0) ? true : false;
> +}
> +
> +void vdagent_audio_playback_sync(uint8_t mute, uint8_t nchannels, uint16_t
> *volume)
> +{
> +    struct OperationSpec os;
> +    syslog(LOG_DEBUG, "%s mute=%s nchannels=%u", __func__,
> +           (mute) ? "yes" : "no", nchannels);
> +    os.op_type = OP_PLAYBACK_SYNC;
> +    os.mute = (mute) ? true : false;
> +    os.nchannels = nchannels;
> +    os.volume = volume;
> +    if (vdagent_pulse_run (&os) == false)
> +        syslog(LOG_WARNING, "Fail to sync playback volume");
> +}
> +
> +void vdagent_audio_record_sync(uint8_t mute, uint8_t nchannels, uint16_t
> *volume)
> +{
> +    struct OperationSpec os;
> +    syslog(LOG_DEBUG, "%s mute=%s nchannels=%u", __func__,
> +           (mute) ? "yes" : "no", nchannels);
> +    os.op_type = OP_RECORD_SYNC;
> +    os.mute = (mute) ? true : false;
> +    os.nchannels = nchannels;
> +    os.volume = volume;
> +    if (vdagent_pulse_run (&os) == false)
> +        syslog(LOG_WARNING, "Fail to sync record volume");
> +}
> diff --git a/src/vdagentd-audio.h b/src/vdagentd-audio.h
> new file mode 100644
> index 0000000..950827a
> --- /dev/null
> +++ b/src/vdagentd-audio.h
> @@ -0,0 +1,27 @@
> +/*  vdagentd-audio.h vdagentd audio handling header
> +
> +    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/>.
> +*/
> +#ifndef __VDAGENTD_AUDIO_H
> +#define __VDAGENTD_AUDIO_H
> +
> +#include <stdio.h>
> +#include <stdint.h>
> +
> +void vdagent_audio_playback_sync(uint8_t mute, uint8_t nchannels, uint16_t
> *volume);
> +void vdagent_audio_record_sync(uint8_t mute, uint8_t nchannels, uint16_t
> *volume);
> +
> +#endif
> --
> 2.1.0
> 
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