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vlc-2-2
Commit 9825859e authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
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ALSA: provide real devices list, i.e. ALSA device hints 

Note that this code seems more likely to trigger race-induced crashes
in the audio mixer core.
parent 4b073399
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Showing with 34 additions and 175 deletions
modules/audio_output/alsa.c
View file @ 9825859e
......@@ -125,137 +125,26 @@ static const int mode = SND_PCM_NO_AUTO_RESAMPLE
/* VLC is currently unable to leverage ALSA softvol. Disable it. */
| SND_PCM_NO_SOFTVOL;
/*****************************************************************************
* Probe: probe the audio device for available formats and channels
*****************************************************************************/
static void Probe (aout_instance_t *p_aout,
const char *psz_device, const char *psz_iec_device,
snd_pcm_format_t pcm_format)
/**
* Initializes list of devices.
*/
static void Probe (vlc_object_t *obj)
{
struct aout_sys_t * p_sys = p_aout->output.p_sys;
vlc_value_t value, text;
int val;
var_Create ( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
text.psz_string = _("Audio Device");
var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
/* We'll open the audio device in non blocking mode so we can just exit
* when it is already in use, but for the real stuff we'll still use
* the blocking mode */
/* Now test linear PCM capabilities */
val = snd_pcm_open (&p_sys->p_snd_pcm, psz_device,
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK | mode);
if (val == 0)
{
int i_channels;
snd_pcm_hw_params_t * p_hw;
snd_pcm_hw_params_alloca (&p_hw);
if ( snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) < 0 )
{
msg_Warn( p_aout, "unable to retrieve initial hardware parameters"
", disabling linear PCM audio" );
snd_pcm_close( p_sys->p_snd_pcm );
return;
}
if (snd_pcm_hw_params_set_format (p_sys->p_snd_pcm, p_hw,
pcm_format) < 0)
{
snd_pcm_close( p_sys->p_snd_pcm );
return;
}
i_channels = aout_FormatNbChannels( &p_aout->output.output );
while ( i_channels > 0 )
{
if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw,
i_channels ) )
{
switch ( i_channels )
{
case 1:
value.i_int = AOUT_VAR_MONO;
text.psz_string = _("Mono");
var_Change (p_aout, "audio-device",
VLC_VAR_ADDCHOICE, &value, &text);
break;
case 2:
value.i_int = AOUT_VAR_STEREO;
text.psz_string = _("Stereo");
var_Change (p_aout, "audio-device",
VLC_VAR_ADDCHOICE, &value, &text);
var_Set (p_aout, "audio-device", value);
break;
case 4:
value.i_int = AOUT_VAR_2F2R;
text.psz_string = _("2 Front 2 Rear");
var_Change (p_aout, "audio-device",
VLC_VAR_ADDCHOICE, &value, &text);
break;
case 6:
value.i_int = AOUT_VAR_5_1;
text.psz_string = (char *)"5.1";
var_Change (p_aout, "audio-device",
VLC_VAR_ADDCHOICE, &value, &text);
break;
}
}
/* Due to design bug in audio output core, this hack is required: */
if (var_Type (obj, "audio-device"))
return;
--i_channels;
}
/* The variable does not exist - first call. */
vlc_value_t text;
/* Special case for mono on stereo only boards */
i_channels = aout_FormatNbChannels( &p_aout->output.output );
var_Change (p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &value, NULL);
if (value.i_int <= 0 && i_channels == 1)
{
if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw, 2 ))
{
value.i_int = AOUT_VAR_STEREO;
text.psz_string = (char*)N_("Stereo");
var_Change (p_aout, "audio-device",
VLC_VAR_ADDCHOICE, &value, &text);
var_Set (p_aout, "audio-device", value);
}
}
/* Close the previously opened device */
snd_pcm_close( p_sys->p_snd_pcm );
}
else
if (val == -EBUSY)
msg_Warn( p_aout, "audio device: %s is already in use", psz_device );
var_Create (obj, "audio-device", VLC_VAR_STRING | VLC_VAR_HASCHOICE);
text.psz_string = _("Audio Device");
var_Change (obj, "audio-device", VLC_VAR_SETTEXT, &text, NULL);
/* Test for S/PDIF device if needed */
if ( psz_iec_device )
{
/* Opening the device should be enough */
val = snd_pcm_open (&p_sys->p_snd_pcm, psz_iec_device,
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK | mode);
if (val == 0)
{
value.i_int = AOUT_VAR_SPDIF;
text.psz_string = (char*)N_("A/52 over S/PDIF");
var_Change (p_aout, "audio-device",
VLC_VAR_ADDCHOICE, &value, &text);
if( var_InheritBool( p_aout, "spdif" ) )
var_Set (p_aout, "audio-device", value);
snd_pcm_close( p_sys->p_snd_pcm );
}
else
if (val == -EBUSY)
msg_Warn( p_aout, "audio device: %s is already in use",
psz_iec_device );
}
GetDevices (obj, NULL);
/* Add final settings to the variable */
var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
var_TriggerCallback( p_aout, "intf-change" );
var_AddCallback (obj, "audio-device", aout_ChannelsRestart, NULL);
var_TriggerCallback (obj, "intf-change");
}
/*****************************************************************************
......@@ -266,9 +155,9 @@ static void Probe (aout_instance_t *p_aout,
* Note: the only heap-allocated string is psz_device. All the other pointers
* are references to psz_device or to stack-allocated data.
*****************************************************************************/
static int Open( vlc_object_t *p_this )
static int Open (vlc_object_t *obj)
{
aout_instance_t * p_aout = (aout_instance_t *)p_this;
aout_instance_t * p_aout = (aout_instance_t *)obj;
/* Allocate structures */
aout_sys_t * p_sys = malloc( sizeof( aout_sys_t ) );
......@@ -277,11 +166,16 @@ static int Open( vlc_object_t *p_this )
p_aout->output.p_sys = p_sys;
/* Get device name */
char *psz_device = var_InheritString( p_aout, "alsa-audio-device" );
char *psz_device;
if (var_Type (p_aout, "audio-device"))
psz_device = var_GetString (p_aout, "audio-device");
else
psz_device = var_InheritString( p_aout, "alsa-audio-device" );
if( unlikely(psz_device == NULL) )
{
free( p_sys );
return VLC_EGENERIC;
return VLC_ENOMEM;
}
/* Choose the IEC device for S/PDIF output:
......@@ -391,46 +285,6 @@ static int Open( vlc_object_t *p_this )
}
}
/* If the variable doesn't exist then it's the first time we're called
and we have to probe the available audio formats and channels */
if (var_Type (p_aout, "audio-device") == 0)
Probe (p_aout, psz_device, psz_iec_device, pcm_format);
bool spdif = false;
switch( var_GetInteger( p_aout, "audio-device") )
{
case AOUT_VAR_5_1:
p_aout->output.output.i_physical_channels
= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
| AOUT_CHAN_LFE;
free( psz_device );
psz_device = strdup( "plug:surround51" );
break;
case AOUT_VAR_2F2R:
p_aout->output.output.i_physical_channels
= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
free( psz_device );
psz_device = strdup( "plug:surround40" );
break;
case AOUT_VAR_STEREO:
p_aout->output.output.i_physical_channels
= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
break;
case AOUT_VAR_MONO:
p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
break;
case AOUT_VAR_SPDIF:
spdif = true;
free( psz_device );
psz_device = psz_iec_device;
psz_iec_device = NULL;
break;
default:
msg_Warn( p_aout, "cannot find audio-device" );
}
#ifdef ALSA_DEBUG
snd_output_stdio_attach( &p_sys->p_snd_stderr, stderr, 0 );
#endif
......@@ -478,8 +332,9 @@ static int Open( vlc_object_t *p_this )
snd_pcm_uframes_t i_period_size;
int i_channels;
if( spdif )
if (var_InheritBool (obj, "spdif"))
{
fourcc = VLC_CODEC_SPDIFL;
i_buffer_size = ALSA_SPDIF_BUFFER_SIZE;
pcm_format = SND_PCM_FORMAT_S16;
i_channels = 2;
......@@ -525,8 +380,6 @@ static int Open( vlc_object_t *p_this )
goto error;
}
if( spdif )
fourcc = VLC_CODEC_SPDIFL;
p_aout->output.output.i_format = fourcc;
val = snd_pcm_hw_params_set_access( p_sys->p_snd_pcm, p_hw,
......@@ -643,6 +496,7 @@ static int Open( vlc_object_t *p_this )
goto error;
}
Probe (obj);
return 0;
error:
......@@ -677,9 +531,9 @@ static void Play( aout_instance_t *p_aout )
/*****************************************************************************
* Close: close the ALSA device
*****************************************************************************/
static void Close( vlc_object_t *p_this )
static void Close (vlc_object_t *obj)
{
aout_instance_t *p_aout = (aout_instance_t *)p_this;
aout_instance_t *p_aout = (aout_instance_t *)obj;
struct aout_sys_t * p_sys = p_aout->output.p_sys;
/* Make sure that the thread will stop once it is waken up */
......@@ -936,6 +790,11 @@ static void GetDevices (vlc_object_t *obj, module_config_t *item)
}
else
{
vlc_value_t val, text;
val.psz_string = dev;
text.psz_string = desc;
var_Change(obj, "audio-device", VLC_VAR_ADDCHOICE, &val, &text);
free(desc);
free(dev);
free(name);
......
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