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* ./plugins/alsa/alsa.c: ALSA device selection patch, courtesy of John

Browse Source 
Paul Lorenti <jpl31@columbia.edu>.
This commit is contained in:
Sam Hocevar 2002-07-17 06:40:49 +00:00
parent 6a5bd8b200
commit 0010fbbd48
2 changed files with 58 additions and 28 deletions
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4
AUTHORS
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@ -284,6 +284,10 @@ E: A.Lipiec@elka.pw.edu.pl
D: Polish translation
S: Poland
N: John Paul Lorenti
E: jpl31@columbia.edu
D: ALSA device selection patch
N: Paul Mackerras
E: paulus@linuxcare.com.au
D: AltiVec IDCT and motion

82
plugins/alsa/alsa.c
View File

@ -2,10 +2,11 @@
* alsa.c : alsa plugin for vlc
*****************************************************************************
* Copyright (C) 2000-2001 VideoLAN
* $Id: alsa.c,v 1.18 2002/06/01 12:31:58 sam Exp $
* $Id: alsa.c,v 1.19 2002/07/17 06:40:49 sam Exp $
*
* Authors: Henri Fallon <henri@videolan.org> - Original Author
* Jeffrey Baker <jwbaker@acm.org> - Port to ALSA 1.0 API
* John Paul Lorenti <jpl31@columbia.edu> - Device selection
*
* 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
@ -49,7 +50,8 @@ static void aout_Close ( aout_thread_t * );
* Build configuration tree.
*****************************************************************************/
MODULE_CONFIG_START
ADD_CATEGORY_HINT( N_("Device"), NULL )
ADD_STRING( "alsa-device", NULL, NULL, N_("Name"), NULL )
MODULE_CONFIG_STOP
MODULE_INIT_START
@ -112,8 +114,10 @@ static void aout_getfunctions( function_list_t * p_function_list )
*****************************************************************************/
static int aout_Open( aout_thread_t *p_aout )
{
int i_ret;
char psz_alsadev[128];
/* Allows user to choose which ALSA device to use */
char psz_alsadev[128];
char *psz_device, *psz_userdev;
int i_ret;
/* Allocate structures */
p_aout->p_sys = malloc( sizeof( aout_sys_t ) );
@ -123,30 +127,54 @@ static int aout_Open( aout_thread_t *p_aout )
return -1;
}
if( p_aout->i_format != AOUT_FMT_AC3 )
/* Read in ALSA device preferences from configuration */
psz_userdev = config_GetPsz( p_aout, "alsa-device" );
if( psz_userdev )
{
strcpy( psz_alsadev, "default" );
psz_device = psz_userdev;
}
else
{
unsigned char s[4];
s[0] = IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO;
s[1] = IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER;
s[2] = 0;
s[3] = IEC958_AES3_CON_FS_48000;
sprintf( psz_alsadev, "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
s[0], s[1], s[2], s[3] );
/* Use the internal logic to decide on the device name */
if( p_aout->i_format != AOUT_FMT_AC3 )
{
psz_device = "default";
}
else
{
unsigned char s[4];
s[0] = IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO;
s[1] = IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER;
s[2] = 0;
s[3] = IEC958_AES3_CON_FS_48000;
sprintf( psz_alsadev,
"iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
s[0], s[1], s[2], s[3] );
psz_device = psz_alsadev;
}
}
/* Open device */
i_ret = snd_pcm_open( &(p_aout->p_sys->p_alsa_handle),
psz_alsadev, SND_PCM_STREAM_PLAYBACK, 0);
psz_device, SND_PCM_STREAM_PLAYBACK, 0);
if( i_ret != 0 )
{
msg_Err( p_aout, "cannot open ALSA device (%s)", snd_strerror(i_ret) );
msg_Err( p_aout, "cannot open ALSA device `%s' (%s)",
psz_device, snd_strerror(i_ret) );
if( psz_userdev )
{
free( psz_userdev );
}
return -1;
}
if( psz_userdev )
{
free( psz_userdev );
}
return 0;
}
@ -158,7 +186,6 @@ static int aout_Open( aout_thread_t *p_aout )
*****************************************************************************/
static int aout_SetFormat( aout_thread_t *p_aout )
{
int i_rv;
int i_format;
@ -199,7 +226,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to retrieve initial parameters" );
return( -1 );
return -1;
}
i_rv = snd_pcm_hw_params_set_access( p_aout->p_sys->p_alsa_handle, p_hw,
@ -207,7 +234,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set interleaved stream format" );
return( -1 );
return -1;
}
i_rv = snd_pcm_hw_params_set_format( p_aout->p_sys->p_alsa_handle,
@ -215,7 +242,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set stream sample size and word order" );
return( -1 );
return -1;
}
i_rv = snd_pcm_hw_params_set_channels( p_aout->p_sys->p_alsa_handle, p_hw,
@ -223,7 +250,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set number of output channels" );
return( -1 );
return -1;
}
i_rv = snd_pcm_hw_params_set_rate_near( p_aout->p_sys->p_alsa_handle, p_hw,
@ -231,7 +258,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set sample rate" );
return( -1 );
return -1;
}
p_aout->p_sys->rate = i_rv;
@ -242,7 +269,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set buffer time" );
return( -1 );
return -1;
}
p_aout->p_sys->buffer_time = i_rv;
@ -251,7 +278,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set period time" );
return( -1 );
return -1;
}
p_aout->p_sys->period_time = i_rv;
@ -259,7 +286,7 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if (i_rv < 0)
{
msg_Err( p_aout, "unable to set hardware configuration" );
return( -1 );
return -1;
}
p_aout->p_sys->chunk_size = snd_pcm_hw_params_get_period_size( p_hw, 0 );
@ -283,10 +310,10 @@ static int aout_SetFormat( aout_thread_t *p_aout )
if( i_rv < 0 )
{
msg_Err( p_aout, "unable to set software configuration" );
return( -1 );
return -1;
}
return( 0 );
return 0;
}
/*****************************************************************************
@ -353,8 +380,7 @@ static int aout_GetBufInfo( aout_thread_t *p_aout, int i_buffer_limit )
break;
}
return( snd_pcm_status_get_avail(p_status) *
p_aout->p_sys->bytes_per_frame );
return snd_pcm_status_get_avail(p_status) * p_aout->p_sys->bytes_per_frame;
}
/*****************************************************************************