mirrors/vlc
0
0
Fork 0
mirror of https://github.com/videolan/vlc.git synced 2024-11-23 09:53:43 +08:00
Code Issues Packages Projects Releases Wiki Activity
master
vlc/modules/access/oss.c
Steve Lhomme 3f613a85f5 vlc_threads: move poll() definitions in a separate header 
It's using a compat version on Windows/Android/OS2 which is not available
to external modules.

This new header can't be used directly from external modules on Windows.
This makes vlc_threads.h usable from external modules on Windows.
2024-01-30 09:39:00 +00:00

434 lines
12 KiB
C
Raw Permalink Blame History

/*****************************************************************************
* oss.c : OSS input module for vlc
*****************************************************************************
* Copyright (C) 2002-2009 VLC authors and VideoLAN
*
* Authors: Benjamin Pracht <bigben at videolan dot org>
* Richard Hosking <richard at hovis dot net>
* Antoine Cellerier <dionoea at videolan d.t org>
* Dennis Lou <dlou99 at yahoo dot com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_access.h>
#include <vlc_demux.h>
#include <vlc_fs.h>
#include <vlc_poll.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/soundcard.h>
#include <poll.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int DemuxOpen ( vlc_object_t * );
static void DemuxClose( vlc_object_t * );
#define STEREO_TEXT N_( "Stereo" )
#define STEREO_LONGTEXT N_( \
"Capture the audio stream in stereo." )
#define SAMPLERATE_TEXT N_( "Samplerate" )
#define SAMPLERATE_LONGTEXT N_( \
"Samplerate of the captured audio stream, in Hz (eg: 11025, 22050, 44100, 48000)" )
#define OSS_DEFAULT "/dev/dsp"
#define CFG_PREFIX "oss-"
vlc_module_begin ()
set_shortname( N_("OSS") )
set_description( N_("OSS input") )
set_subcategory( SUBCAT_INPUT_ACCESS )
add_shortcut( "oss" )
set_capability( "access", 0 )
set_callbacks( DemuxOpen, DemuxClose )
add_bool( CFG_PREFIX "stereo", true, STEREO_TEXT, STEREO_LONGTEXT )
add_integer( CFG_PREFIX "samplerate", 48000, SAMPLERATE_TEXT,
SAMPLERATE_LONGTEXT )
vlc_module_end ()
/*****************************************************************************
* Access: local prototypes
*****************************************************************************/
static int DemuxControl( demux_t *, int, va_list );
static int Demux( demux_t * );
static block_t* GrabAudio( demux_t *p_demux );
static int OpenAudioDev( demux_t * );
static int OpenAudioDevOss( demux_t * );
static bool ProbeAudioDevOss( demux_t *, const char *psz_device );
struct buffer_t
{
void * start;
size_t length;
};
typedef struct
{
const char *psz_device; /* OSS device from MRL */
int i_fd;
/* Audio */
unsigned int i_sample_rate;
bool b_stereo;
size_t i_max_frame_size;
block_t *p_block;
es_out_id_t *p_es;
vlc_tick_t i_next_demux_date; /* Used to handle oss:// as input-slave properly */
} demux_sys_t;
static int FindMainDevice( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
msg_Dbg( p_demux, "opening device '%s'", p_sys->psz_device );
if( ProbeAudioDevOss( p_demux, p_sys->psz_device ) )
{
msg_Dbg( p_demux, "'%s' is an audio device", p_sys->psz_device );
p_sys->i_fd = OpenAudioDev( p_demux );
}
if( p_sys->i_fd < 0 )
return VLC_EGENERIC;
return VLC_SUCCESS;
}
/*****************************************************************************
* DemuxOpen: opens oss device, access_demux callback
*****************************************************************************
*
* url: <oss device>::::
*
*****************************************************************************/
static int DemuxOpen( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
if (p_demux->out == NULL)
return VLC_EGENERIC;
/* Set up p_demux */
p_demux->pf_control = DemuxControl;
p_demux->pf_demux = Demux;
p_demux->p_sys = p_sys = vlc_obj_calloc( p_this, 1, sizeof( demux_sys_t ) );
if( p_sys == NULL ) return VLC_ENOMEM;
p_sys->i_sample_rate = var_InheritInteger( p_demux, CFG_PREFIX "samplerate" );
p_sys->b_stereo = var_InheritBool( p_demux, CFG_PREFIX "stereo" );
p_sys->i_fd = -1;
p_sys->p_es = NULL;
p_sys->p_block = NULL;
p_sys->i_next_demux_date = -1;
if( p_demux->psz_location && *p_demux->psz_location )
p_sys->psz_device = p_demux->psz_location;
else
p_sys->psz_device = OSS_DEFAULT;
if( FindMainDevice( p_demux ) != VLC_SUCCESS )
{
DemuxClose( p_this );
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: close device, free resources
*****************************************************************************/
static void DemuxClose( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t *)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
if( p_sys->i_fd >= 0 )
vlc_close( p_sys->i_fd );
if( p_sys->p_block ) block_Release( p_sys->p_block );
}
/*****************************************************************************
* DemuxControl:
*****************************************************************************/
static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
{
demux_sys_t *p_sys = p_demux->p_sys;
bool *pb;
switch( i_query )
{
/* Special for access_demux */
case DEMUX_CAN_PAUSE:
case DEMUX_CAN_SEEK:
case DEMUX_CAN_CONTROL_PACE:
pb = va_arg( args, bool * );
*pb = false;
return VLC_SUCCESS;
case DEMUX_GET_PTS_DELAY:
*va_arg( args, vlc_tick_t * ) =
VLC_TICK_FROM_MS(var_InheritInteger( p_demux, "live-caching" ));
return VLC_SUCCESS;
case DEMUX_GET_TIME:
*va_arg( args, vlc_tick_t * ) = vlc_tick_now();
return VLC_SUCCESS;
case DEMUX_SET_NEXT_DEMUX_TIME:
p_sys->i_next_demux_date = va_arg( args, vlc_tick_t );
return VLC_SUCCESS;
/* TODO implement others */
default:
return VLC_EGENERIC;
}
return VLC_EGENERIC;
}
/*****************************************************************************
* Demux: Processes the audio frame
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
struct pollfd fd;
fd.fd = p_sys->i_fd;
fd.events = POLLIN|POLLPRI;
fd.revents = 0;
block_t *p_block = NULL;
do
{
if( p_block )
{
es_out_Send( p_demux->out, p_sys->p_es, p_block );
p_block = NULL;
}
/* Wait for data */
if( poll( &fd, 1, 10 ) ) /* Timeout after 0.01 seconds. Bigger delays are an issue when used with/as an input-slave since all the inputs run in the same thread. */
{
if( errno == EINTR )
continue;
if( fd.revents & (POLLIN|POLLPRI) )
{
p_block = GrabAudio( p_demux );
if( p_block )
es_out_SetPCR( p_demux->out, p_block->i_pts );
}
}
} while( p_block && p_sys->i_next_demux_date > 0 &&
p_block->i_pts < p_sys->i_next_demux_date );
if( p_block )
es_out_Send( p_demux->out, p_sys->p_es, p_block );
return 1;
}
/*****************************************************************************
* GrabAudio: Grab an audio frame
*****************************************************************************/
static block_t* GrabAudio( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
struct audio_buf_info buf_info;
int i_read = 0, i_correct;
block_t *p_block;
if( p_sys->p_block ) p_block = p_sys->p_block;
else p_block = block_Alloc( p_sys->i_max_frame_size );
if( !p_block )
{
msg_Warn( p_demux, "cannot get block" );
return NULL;
}
p_sys->p_block = p_block;
i_read = read( p_sys->i_fd, p_block->p_buffer,
p_sys->i_max_frame_size );
if( i_read <= 0 ) return NULL;
p_block->i_buffer = i_read;
p_sys->p_block = NULL;
/* Correct the date because of kernel buffering */
i_correct = i_read;
if( ioctl( p_sys->i_fd, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
{
i_correct += buf_info.bytes;
}
/* Timestamp */
p_block->i_pts = p_block->i_dts =
vlc_tick_now() - vlc_tick_from_samples(i_correct,
2 * ( p_sys->b_stereo ? 2 : 1) * p_sys->i_sample_rate);
return p_block;
}
/*****************************************************************************
* OpenAudioDev: open and set up the audio device and probe for capabilities
*****************************************************************************/
static int OpenAudioDevOss( demux_t *p_demux )
{
demux_sys_t *p_sys = (demux_sys_t *)p_demux->p_sys;
int i_fd;
int i_format;
i_fd = vlc_open( p_sys->psz_device, O_RDONLY | O_NONBLOCK );
if( i_fd < 0 )
{
msg_Err( p_demux, "cannot open OSS audio device (%s)",
vlc_strerror_c(errno) );
goto adev_fail;
}
i_format = AFMT_S16_LE;
if( ioctl( i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
|| i_format != AFMT_S16_LE )
{
msg_Err( p_demux,
"cannot set audio format (16b little endian) (%s)",
vlc_strerror_c(errno) );
goto adev_fail;
}
if( ioctl( i_fd, SNDCTL_DSP_STEREO, &p_sys->b_stereo ) < 0 )
{
msg_Err( p_demux, "cannot set audio channels count (%s)",
vlc_strerror_c(errno) );
goto adev_fail;
}
if( ioctl( i_fd, SNDCTL_DSP_SPEED, &p_sys->i_sample_rate ) < 0 )
{
msg_Err( p_demux, "cannot set audio sample rate (%s)",
vlc_strerror_c(errno) );
goto adev_fail;
}
p_sys->i_max_frame_size = 6 * 1024;
return i_fd;
adev_fail:
if( i_fd >= 0 )
vlc_close( i_fd );
return -1;
}
static int OpenAudioDev( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
int i_fd = OpenAudioDevOss( p_demux );
if( i_fd < 0 )
return i_fd;
msg_Dbg( p_demux, "opened adev=`%s' %s %dHz",
p_sys->psz_device, p_sys->b_stereo ? "stereo" : "mono",
p_sys->i_sample_rate );
es_format_t fmt;
es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_S16L );
fmt.audio.i_channels = p_sys->b_stereo ? 2 : 1;
fmt.audio.i_rate = p_sys->i_sample_rate;
fmt.audio.i_bitspersample = 16;
fmt.audio.i_blockalign = fmt.audio.i_channels * fmt.audio.i_bitspersample / 8;
fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate * fmt.audio.i_bitspersample;
msg_Dbg( p_demux, "new audio es %d channels %dHz",
fmt.audio.i_channels, fmt.audio.i_rate );
p_sys->p_es = es_out_Add( p_demux->out, &fmt );
return i_fd;
}
/*****************************************************************************
* ProbeAudioDev: probe audio for capabilities
*****************************************************************************/
static bool ProbeAudioDevOss( demux_t *p_demux, const char *psz_device )
{
int i_caps;
int i_fd = vlc_open( psz_device, O_RDONLY | O_NONBLOCK );
if( i_fd < 0 )
{
msg_Err( p_demux, "cannot open device %s for OSS audio (%s)",
psz_device, vlc_strerror_c(errno) );
goto open_failed;
}
/* this will fail if the device is video */
if( ioctl( i_fd, SNDCTL_DSP_GETCAPS, &i_caps ) < 0 )
{
msg_Err( p_demux, "cannot get audio caps (%s)",
vlc_strerror_c(errno) );
goto open_failed;
}
if( i_fd >= 0 )
vlc_close( i_fd );
return true;
open_failed:
if( i_fd >= 0 )
vlc_close( i_fd );
return false;
}
Reference in New Issue View Git Blame Copy Permalink