--- /dev/null
+/*****************************************************************************
+ * oss.c : OSS input module for vlc
+ *****************************************************************************
+ * Copyright (C) 2002-2009 the VideoLAN team
+ * $Id$
+ *
+ * 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 General Public License as published by
+ * the Free Software Foundation; either version 2 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, 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_input.h>
+#include <vlc_vout.h>
+
+#include <ctype.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include <sys/soundcard.h>
+
+#include <poll.h>
+
+/*****************************************************************************
+ * Module descriptior
+ *****************************************************************************/
+
+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 CACHING_TEXT N_("Caching value in ms")
+#define CACHING_LONGTEXT N_( \
+ "Caching value for OSS captures. This " \
+ "value should be set in milliseconds." )
+
+#define OSS_DEFAULT "/dev/dsp"
+
+#define CFG_PREFIX "oss-"
+
+vlc_module_begin ()
+ set_shortname( N_("OSS") )
+ set_description( N_("OSS input") )
+ set_category( CAT_INPUT )
+ set_subcategory( SUBCAT_INPUT_ACCESS )
+
+ add_shortcut( "oss" )
+ set_capability( "access_demux", 10 )
+ set_callbacks( DemuxOpen, DemuxClose )
+
+ add_bool( CFG_PREFIX "stereo", true, NULL, STEREO_TEXT, STEREO_LONGTEXT,
+ true );
+ add_integer( CFG_PREFIX "samplerate", 48000, NULL, SAMPLERATE_TEXT,
+ SAMPLERATE_LONGTEXT, true );
+ add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
+ CACHING_TEXT, CACHING_LONGTEXT, true );
+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;
+};
+
+struct demux_sys_t
+{
+ const char *psz_device; /* OSS device from MRL */
+
+ int i_fd_audio;
+
+ /* Audio */
+ int i_pts;
+ unsigned int i_sample_rate;
+ bool b_stereo;
+ size_t i_audio_max_frame_size;
+ block_t *p_block_audio;
+ es_out_id_t *p_es_audio;
+};
+
+static int FindMainDevice( demux_t *p_demux )
+{
+ msg_Dbg( p_demux, "opening device '%s'", p_demux->p_sys->psz_device );
+ if( ProbeAudioDevOss( p_demux, p_demux->p_sys->psz_device ) )
+ {
+ msg_Dbg( p_demux, "'%s' is an audio device", p_demux->p_sys->psz_device );
+ p_demux->p_sys->i_fd_audio = OpenAudioDev( p_demux );
+ }
+
+ if( p_demux->p_sys->i_fd_audio < 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;
+
+ /* Only when selected */
+ if( *p_demux->psz_access == '\0' ) return VLC_EGENERIC;
+
+ /* Set up p_demux */
+ p_demux->pf_control = DemuxControl;
+ p_demux->pf_demux = Demux;
+ p_demux->info.i_update = 0;
+ p_demux->info.i_title = 0;
+ p_demux->info.i_seekpoint = 0;
+
+ p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
+ if( p_sys == NULL ) return VLC_ENOMEM;
+
+ p_sys->i_sample_rate = var_CreateGetInteger( p_demux, CFG_PREFIX "samplerate" );
+ p_sys->b_stereo = var_CreateGetBool( p_demux, CFG_PREFIX "stereo" );
+ p_sys->i_pts = var_CreateGetInteger( p_demux, CFG_PREFIX "caching" );
+ p_sys->psz_device = NULL;
+ p_sys->i_fd_audio = -1;
+ p_sys->p_es_audio = 0;
+ p_sys->p_block_audio = 0;
+
+ if( p_demux->psz_path && *p_demux->psz_path )
+ p_sys->psz_device = p_demux->psz_path;
+ else
+ p_sys->psz_device = OSS_DEFAULT;
+ msg_Err( p_this, "Device is %s", p_sys->psz_device );
+
+ 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_audio >= 0 ) close( p_sys->i_fd_audio );
+
+ if( p_sys->p_block_audio ) block_Release( p_sys->p_block_audio );
+ free( p_sys );
+}
+
+/*****************************************************************************
+ * 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;
+ int64_t *pi64;
+
+ switch( i_query )
+ {
+ /* Special for access_demux */
+ case DEMUX_CAN_PAUSE:
+ case DEMUX_CAN_SEEK:
+ case DEMUX_SET_PAUSE_STATE:
+ case DEMUX_CAN_CONTROL_PACE:
+ pb = (bool*)va_arg( args, bool * );
+ *pb = false;
+ return VLC_SUCCESS;
+
+ case DEMUX_GET_PTS_DELAY:
+ pi64 = (int64_t*)va_arg( args, int64_t * );
+ *pi64 = (int64_t)p_sys->i_pts * 1000;
+ return VLC_SUCCESS;
+
+ case DEMUX_GET_TIME:
+ pi64 = (int64_t*)va_arg( args, int64_t * );
+ *pi64 = mdate();
+ 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_audio;
+ fd.events = POLLIN|POLLPRI;
+ fd.revents = 0;
+
+ /* Wait for data */
+ if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
+ {
+ if( fd.revents & (POLLIN|POLLPRI) )
+ {
+ block_t *p_block = GrabAudio( p_demux );
+ if( p_block )
+ {
+ es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
+ es_out_Send( p_demux->out, p_sys->p_es_audio, 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_audio ) p_block = p_sys->p_block_audio;
+ else p_block = block_New( p_demux, p_sys->i_audio_max_frame_size );
+
+ if( !p_block )
+ {
+ msg_Warn( p_demux, "cannot get block" );
+ return 0;
+ }
+
+ p_sys->p_block_audio = p_block;
+
+ i_read = read( p_sys->i_fd_audio, p_block->p_buffer,
+ p_sys->i_audio_max_frame_size );
+
+ if( i_read <= 0 ) return 0;
+
+ p_block->i_buffer = i_read;
+ p_sys->p_block_audio = 0;
+
+ /* Correct the date because of kernel buffering */
+ i_correct = i_read;
+ if( ioctl( p_sys->i_fd_audio, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
+ {
+ i_correct += buf_info.bytes;
+ }
+
+ /* Timestamp */
+ p_block->i_pts = p_block->i_dts =
+ mdate() - INT64_C(1000000) * (mtime_t)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 )
+{
+ int i_fd;
+ int i_format;
+
+ i_fd = open( p_demux->p_sys->psz_device, O_RDONLY | O_NONBLOCK );
+
+ if( i_fd < 0 )
+ {
+ msg_Err( p_demux, "cannot open OSS audio device (%m)" );
+ 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) (%m)" );
+ goto adev_fail;
+ }
+
+ if( ioctl( i_fd, SNDCTL_DSP_STEREO,
+ &p_demux->p_sys->b_stereo ) < 0 )
+ {
+ msg_Err( p_demux, "cannot set audio channels count (%m)" );
+ goto adev_fail;
+ }
+
+ if( ioctl( i_fd, SNDCTL_DSP_SPEED,
+ &p_demux->p_sys->i_sample_rate ) < 0 )
+ {
+ msg_Err( p_demux, "cannot set audio sample rate (%m)" );
+ goto adev_fail;
+ }
+
+ p_demux->p_sys->i_audio_max_frame_size = 6 * 1024;
+
+ return i_fd;
+
+ adev_fail:
+
+ if( i_fd >= 0 ) 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_FOURCC('a','r','a','w') );
+
+ 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_audio = 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 = open( psz_device, O_RDONLY | O_NONBLOCK );
+
+ if( i_fd < 0 )
+ {
+ msg_Err( p_demux, "cannot open device %s for OSS audio (%m)", psz_device );
+ 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 (%m)" );
+ goto open_failed;
+ }
+
+ if( i_fd >= 0 ) close( i_fd );
+
+ return true;
+
+open_failed:
+ if( i_fd >= 0 ) close( i_fd );
+ return false;
+}
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