mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
689 lines
23 KiB
C
689 lines
23 KiB
C
/*****************************************************************************
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* oss.c : OSS /dev/dsp module for vlc
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*****************************************************************************
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* Copyright (C) 2000-2002 the VideoLAN team
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* $Id$
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*
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* Authors: Michel Kaempf <maxx@via.ecp.fr>
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* Sam Hocevar <sam@zoy.org>
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* Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <errno.h> /* ENOMEM */
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#include <fcntl.h> /* open(), O_WRONLY */
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#include <sys/ioctl.h> /* ioctl() */
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#include <unistd.h> /* write(), close() */
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#include <vlc/vlc.h>
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#ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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#endif
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#include <vlc_aout.h>
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/* SNDCTL_DSP_RESET, SNDCTL_DSP_SETFMT, SNDCTL_DSP_STEREO, SNDCTL_DSP_SPEED,
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* SNDCTL_DSP_GETOSPACE */
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#ifdef HAVE_SOUNDCARD_H
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# include <soundcard.h>
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#elif defined( HAVE_SYS_SOUNDCARD_H )
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# include <sys/soundcard.h>
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#elif defined( HAVE_MACHINE_SOUNDCARD_H )
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# include <machine/soundcard.h>
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#endif
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/* Patches for ignorant OSS versions */
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#ifndef AFMT_AC3
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# define AFMT_AC3 0x00000400 /* Dolby Digital AC3 */
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#endif
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#ifndef AFMT_S16_NE
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# ifdef WORDS_BIGENDIAN
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# define AFMT_S16_NE AFMT_S16_BE
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# else
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# define AFMT_S16_NE AFMT_S16_LE
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# endif
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#endif
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/*****************************************************************************
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* aout_sys_t: OSS audio output method descriptor
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*****************************************************************************
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* This structure is part of the audio output thread descriptor.
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* It describes the DSP specific properties of an audio device.
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*****************************************************************************/
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struct aout_sys_t
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{
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int i_fd;
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int b_workaround_buggy_driver;
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int i_fragstotal;
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mtime_t max_buffer_duration;
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};
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/* This must be a power of 2. */
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#define FRAME_SIZE 1024
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#define FRAME_COUNT 32
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close ( vlc_object_t * );
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static void Play ( aout_instance_t * );
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static int OSSThread ( aout_instance_t * );
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static mtime_t BufferDuration( aout_instance_t * p_aout );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define BUGGY_TEXT N_("Try to work around buggy OSS drivers")
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#define BUGGY_LONGTEXT N_( \
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"Some buggy OSS drivers just don't like when their internal buffers " \
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"are completely filled (the sound gets heavily hashed). If you have one " \
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"of these drivers, then you need to enable this option." )
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vlc_module_begin();
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set_shortname( "OSS" );
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set_description( _("UNIX OSS audio output") );
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set_category( CAT_AUDIO );
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set_subcategory( SUBCAT_AUDIO_AOUT );
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add_file( "dspdev", "/dev/dsp", aout_FindAndRestart,
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N_("OSS DSP device"), NULL, VLC_FALSE );
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add_bool( "oss-buggy", 0, NULL, BUGGY_TEXT, BUGGY_LONGTEXT, VLC_TRUE );
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set_capability( "audio output", 100 );
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add_shortcut( "oss" );
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set_callbacks( Open, Close );
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vlc_module_end();
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/*****************************************************************************
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* Probe: probe the audio device for available formats and channels
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*****************************************************************************/
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static void Probe( aout_instance_t * p_aout )
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{
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struct aout_sys_t * p_sys = p_aout->output.p_sys;
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vlc_value_t val, text;
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int i_format, i_nb_channels;
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var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
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text.psz_string = _("Audio Device");
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var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
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/* Test for multi-channel. */
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#ifdef SNDCTL_DSP_GETCHANNELMASK
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if ( aout_FormatNbChannels( &p_aout->output.output ) > 2 )
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{
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/* Check that the device supports this. */
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int i_chanmask;
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/* Reset all. */
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i_format = AFMT_S16_NE;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_RESET, NULL ) < 0 ||
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ioctl( p_sys->i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0 )
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{
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msg_Err( p_aout, "cannot reset OSS audio device" );
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var_Destroy( p_aout, "audio-device" );
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return;
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}
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if ( ioctl( p_sys->i_fd, SNDCTL_DSP_GETCHANNELMASK,
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&i_chanmask ) == 0 )
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{
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if ( !(i_chanmask & DSP_BIND_FRONT) )
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{
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msg_Err( p_aout, "no front channels! (%x)",
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i_chanmask );
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return;
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}
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if ( (i_chanmask & (DSP_BIND_SURR | DSP_BIND_CENTER_LFE))
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&& (p_aout->output.output.i_physical_channels ==
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(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
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| AOUT_CHAN_LFE)) )
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{
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val.i_int = AOUT_VAR_5_1;
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text.psz_string = "5.1";
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var_Change( p_aout, "audio-device",
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VLC_VAR_ADDCHOICE, &val, &text );
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}
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if ( (i_chanmask & DSP_BIND_SURR)
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&& (p_aout->output.output.i_physical_channels &
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(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT)) )
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{
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val.i_int = AOUT_VAR_2F2R;
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text.psz_string = N_("2 Front 2 Rear");
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var_Change( p_aout, "audio-device",
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VLC_VAR_ADDCHOICE, &val, &text );
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}
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}
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}
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#endif
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/* Reset all. */
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i_format = AFMT_S16_NE;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_RESET, NULL ) < 0 ||
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ioctl( p_sys->i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0 )
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{
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msg_Err( p_aout, "cannot reset OSS audio device" );
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var_Destroy( p_aout, "audio-device" );
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return;
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}
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/* Test for stereo. */
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i_nb_channels = 2;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_CHANNELS, &i_nb_channels ) >= 0
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&& i_nb_channels == 2 )
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{
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val.i_int = AOUT_VAR_STEREO;
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text.psz_string = N_("Stereo");
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var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
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}
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/* Reset all. */
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i_format = AFMT_S16_NE;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_RESET, NULL ) < 0 ||
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ioctl( p_sys->i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0 )
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{
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msg_Err( p_aout, "cannot reset OSS audio device" );
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var_Destroy( p_aout, "audio-device" );
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return;
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}
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/* Test for mono. */
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i_nb_channels = 1;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_CHANNELS, &i_nb_channels ) >= 0
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&& i_nb_channels == 1 )
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{
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val.i_int = AOUT_VAR_MONO;
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text.psz_string = N_("Mono");
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var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
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if ( p_aout->output.output.i_physical_channels == AOUT_CHAN_CENTER )
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{
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var_Set( p_aout, "audio-device", val );
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}
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}
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_RESET, NULL ) < 0 )
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{
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msg_Err( p_aout, "cannot reset OSS audio device" );
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var_Destroy( p_aout, "audio-device" );
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return;
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}
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/* Test for spdif. */
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if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
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{
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i_format = AFMT_AC3;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_SETFMT, &i_format ) >= 0
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&& i_format == AFMT_AC3 )
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{
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val.i_int = AOUT_VAR_SPDIF;
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text.psz_string = N_("A/52 over S/PDIF");
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var_Change( p_aout, "audio-device",
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VLC_VAR_ADDCHOICE, &val, &text );
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if( config_GetInt( p_aout, "spdif" ) )
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var_Set( p_aout, "audio-device", val );
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}
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else if( config_GetInt( p_aout, "spdif" ) )
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{
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msg_Warn( p_aout, "S/PDIF not supported by card" );
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}
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}
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var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart,
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NULL );
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}
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/*****************************************************************************
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* Open: open the audio device (the digital sound processor)
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*****************************************************************************
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* This function opens the DSP as a usual non-blocking write-only file, and
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* modifies the p_aout->p_sys->i_fd with the file's descriptor.
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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aout_instance_t * p_aout = (aout_instance_t *)p_this;
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struct aout_sys_t * p_sys;
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char * psz_device;
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vlc_value_t val;
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/* Allocate structure */
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p_aout->output.p_sys = p_sys = malloc( sizeof( aout_sys_t ) );
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if( p_sys == NULL )
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{
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msg_Err( p_aout, "out of memory" );
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return VLC_ENOMEM;
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}
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/* Get device name */
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if( (psz_device = config_GetPsz( p_aout, "dspdev" )) == NULL )
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{
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msg_Err( p_aout, "no audio device specified (maybe /dev/dsp?)" );
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free( p_sys );
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return VLC_EGENERIC;
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}
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/* Open the sound device in non-blocking mode, because ALSA's OSS
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* emulation and some broken OSS drivers would make a blocking call
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* wait forever until the device is available. Since this breaks the
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* OSS spec, we immediately put it back to blocking mode if the
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* operation was successful. */
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p_sys->i_fd = open( psz_device, O_WRONLY | O_NDELAY );
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if( p_sys->i_fd < 0 )
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{
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msg_Err( p_aout, "cannot open audio device (%s)", psz_device );
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free( p_sys );
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return VLC_EGENERIC;
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}
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/* if the opening was ok, put the device back in blocking mode */
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fcntl( p_sys->i_fd, F_SETFL,
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fcntl( p_sys->i_fd, F_GETFL ) &~ FNDELAY );
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free( psz_device );
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p_aout->output.pf_play = Play;
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if ( var_Type( p_aout, "audio-device" ) == 0 )
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{
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Probe( p_aout );
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}
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if ( var_Get( p_aout, "audio-device", &val ) < 0 )
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{
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/* Probe() has failed. */
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free( p_sys );
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return VLC_EGENERIC;
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}
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if ( val.i_int == AOUT_VAR_SPDIF )
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{
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p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
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}
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else if ( val.i_int == AOUT_VAR_5_1 )
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{
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p_aout->output.output.i_format = AOUT_FMT_S16_NE;
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p_aout->output.output.i_physical_channels
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= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
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| AOUT_CHAN_LFE;
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}
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else if ( val.i_int == AOUT_VAR_2F2R )
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{
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p_aout->output.output.i_format = AOUT_FMT_S16_NE;
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p_aout->output.output.i_physical_channels
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= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
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}
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else if ( val.i_int == AOUT_VAR_STEREO )
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{
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p_aout->output.output.i_format = AOUT_FMT_S16_NE;
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p_aout->output.output.i_physical_channels
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= AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
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}
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else if ( val.i_int == AOUT_VAR_MONO )
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{
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p_aout->output.output.i_format = AOUT_FMT_S16_NE;
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p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
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}
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else
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{
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/* This should not happen ! */
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msg_Err( p_aout, "internal: can't find audio-device (%i)", val.i_int );
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free( p_sys );
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return VLC_EGENERIC;
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}
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val.b_bool = VLC_TRUE;
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var_Set( p_aout, "intf-change", val );
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/* Reset the DSP device */
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_RESET, NULL ) < 0 )
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{
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msg_Err( p_aout, "cannot reset OSS audio device" );
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close( p_sys->i_fd );
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free( p_sys );
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return VLC_EGENERIC;
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}
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/* Set the output format */
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if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
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{
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int i_format = AFMT_AC3;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
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|| i_format != AFMT_AC3 )
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{
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msg_Err( p_aout, "cannot reset OSS audio device" );
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close( p_sys->i_fd );
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free( p_sys );
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return VLC_EGENERIC;
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}
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p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
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p_aout->output.i_nb_samples = A52_FRAME_NB;
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p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
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p_aout->output.output.i_frame_length = A52_FRAME_NB;
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aout_VolumeNoneInit( p_aout );
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}
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if ( !AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
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{
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unsigned int i_format = AFMT_S16_NE;
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unsigned int i_frame_size, i_fragments;
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unsigned int i_rate;
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unsigned int i_nb_channels;
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audio_buf_info audio_buf;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0 )
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{
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msg_Err( p_aout, "cannot set audio output format" );
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close( p_sys->i_fd );
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free( p_sys );
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return VLC_EGENERIC;
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}
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switch ( i_format )
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{
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case AFMT_U8:
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p_aout->output.output.i_format = VLC_FOURCC('u','8',' ',' ');
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break;
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case AFMT_S8:
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p_aout->output.output.i_format = VLC_FOURCC('s','8',' ',' ');
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break;
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case AFMT_U16_LE:
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p_aout->output.output.i_format = VLC_FOURCC('u','1','6','l');
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break;
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case AFMT_S16_LE:
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p_aout->output.output.i_format = VLC_FOURCC('s','1','6','l');
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break;
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case AFMT_U16_BE:
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p_aout->output.output.i_format = VLC_FOURCC('u','1','6','b');
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break;
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case AFMT_S16_BE:
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p_aout->output.output.i_format = VLC_FOURCC('s','1','6','b');
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break;
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default:
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msg_Err( p_aout, "OSS fell back to an unknown format (%d)",
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i_format );
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close( p_sys->i_fd );
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free( p_sys );
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return VLC_EGENERIC;
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}
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i_nb_channels = aout_FormatNbChannels( &p_aout->output.output );
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/* Set the number of channels */
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_CHANNELS, &i_nb_channels ) < 0 ||
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i_nb_channels != aout_FormatNbChannels( &p_aout->output.output ) )
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{
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msg_Err( p_aout, "cannot set number of audio channels (%s)",
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aout_FormatPrintChannels( &p_aout->output.output) );
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close( p_sys->i_fd );
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free( p_sys );
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return VLC_EGENERIC;
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}
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/* Set the output rate */
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i_rate = p_aout->output.output.i_rate;
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if( ioctl( p_sys->i_fd, SNDCTL_DSP_SPEED, &i_rate ) < 0 )
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{
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msg_Err( p_aout, "cannot set audio output rate (%i)",
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p_aout->output.output.i_rate );
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close( p_sys->i_fd );
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|
free( p_sys );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
if( i_rate != p_aout->output.output.i_rate )
|
|
{
|
|
p_aout->output.output.i_rate = i_rate;
|
|
}
|
|
|
|
/* Set the fragment size */
|
|
aout_FormatPrepare( &p_aout->output.output );
|
|
|
|
/* i_fragment = xxxxyyyy where: xxxx is fragtotal
|
|
* 1 << yyyy is fragsize */
|
|
i_frame_size = ((uint64_t)p_aout->output.output.i_bytes_per_frame * p_aout->output.output.i_rate * 65536) / (48000 * 2 * 2) / FRAME_COUNT;
|
|
i_fragments = 4;
|
|
while( i_fragments < 12 && (1U << i_fragments) < i_frame_size )
|
|
{
|
|
++i_fragments;
|
|
}
|
|
i_fragments |= FRAME_COUNT << 16;
|
|
if( ioctl( p_sys->i_fd, SNDCTL_DSP_SETFRAGMENT, &i_fragments ) < 0 )
|
|
{
|
|
msg_Warn( p_aout, "cannot set fragment size (%.8x)", i_fragments );
|
|
}
|
|
|
|
if( ioctl( p_sys->i_fd, SNDCTL_DSP_GETOSPACE, &audio_buf ) < 0 )
|
|
{
|
|
msg_Err( p_aout, "cannot get fragment size" );
|
|
close( p_sys->i_fd );
|
|
free( p_sys );
|
|
return VLC_EGENERIC;
|
|
}
|
|
else
|
|
{
|
|
/* Number of fragments actually allocated */
|
|
p_aout->output.p_sys->i_fragstotal = audio_buf.fragstotal;
|
|
|
|
/* Maximum duration the soundcard's buffer can hold */
|
|
p_aout->output.p_sys->max_buffer_duration =
|
|
(mtime_t)audio_buf.fragstotal * audio_buf.fragsize * 1000000
|
|
/ p_aout->output.output.i_bytes_per_frame
|
|
/ p_aout->output.output.i_rate
|
|
* p_aout->output.output.i_frame_length;
|
|
|
|
p_aout->output.i_nb_samples = audio_buf.fragsize /
|
|
p_aout->output.output.i_bytes_per_frame;
|
|
}
|
|
|
|
aout_VolumeSoftInit( p_aout );
|
|
}
|
|
|
|
p_aout->output.p_sys->b_workaround_buggy_driver =
|
|
config_GetInt( p_aout, "oss-buggy" );
|
|
|
|
/* Create OSS thread and wait for its readiness. */
|
|
if( vlc_thread_create( p_aout, "aout", OSSThread,
|
|
VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
|
|
{
|
|
msg_Err( p_aout, "cannot create OSS thread (%m)" );
|
|
close( p_sys->i_fd );
|
|
free( p_sys );
|
|
return VLC_ETHREAD;
|
|
}
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Play: nothing to do
|
|
*****************************************************************************/
|
|
static void Play( aout_instance_t *p_aout )
|
|
{
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Close: close the DSP audio device
|
|
*****************************************************************************/
|
|
static void Close( vlc_object_t * p_this )
|
|
{
|
|
aout_instance_t *p_aout = (aout_instance_t *)p_this;
|
|
struct aout_sys_t * p_sys = p_aout->output.p_sys;
|
|
|
|
vlc_object_kill( p_aout );
|
|
vlc_thread_join( p_aout );
|
|
p_aout->b_die = VLC_FALSE;
|
|
|
|
ioctl( p_sys->i_fd, SNDCTL_DSP_RESET, NULL );
|
|
close( p_sys->i_fd );
|
|
|
|
free( p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* BufferDuration: buffer status query
|
|
*****************************************************************************
|
|
* This function returns the duration in microseconds of the current buffer.
|
|
*****************************************************************************/
|
|
static mtime_t BufferDuration( aout_instance_t * p_aout )
|
|
{
|
|
struct aout_sys_t * p_sys = p_aout->output.p_sys;
|
|
audio_buf_info audio_buf;
|
|
int i_bytes;
|
|
|
|
/* Fill the audio_buf_info structure:
|
|
* - fragstotal: total number of fragments allocated
|
|
* - fragsize: size of a fragment in bytes
|
|
* - bytes: available space in bytes (includes partially used fragments)
|
|
* Note! 'bytes' could be more than fragments*fragsize */
|
|
ioctl( p_sys->i_fd, SNDCTL_DSP_GETOSPACE, &audio_buf );
|
|
|
|
/* calculate number of available fragments (not partially used ones) */
|
|
i_bytes = (audio_buf.fragstotal * audio_buf.fragsize) - audio_buf.bytes;
|
|
|
|
/* Return the fragment duration */
|
|
return (mtime_t)i_bytes * 1000000
|
|
/ p_aout->output.output.i_bytes_per_frame
|
|
/ p_aout->output.output.i_rate
|
|
* p_aout->output.output.i_frame_length;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* OSSThread: asynchronous thread used to DMA the data to the device
|
|
*****************************************************************************/
|
|
static int OSSThread( aout_instance_t * p_aout )
|
|
{
|
|
struct aout_sys_t * p_sys = p_aout->output.p_sys;
|
|
mtime_t next_date = 0;
|
|
|
|
while ( !p_aout->b_die )
|
|
{
|
|
aout_buffer_t * p_buffer = NULL;
|
|
int i_tmp, i_size;
|
|
byte_t * p_bytes;
|
|
|
|
if ( p_aout->output.output.i_format != VLC_FOURCC('s','p','d','i') )
|
|
{
|
|
mtime_t buffered = BufferDuration( p_aout );
|
|
|
|
if( p_aout->output.p_sys->b_workaround_buggy_driver )
|
|
{
|
|
#define i_fragstotal p_aout->output.p_sys->i_fragstotal
|
|
/* Wait a bit - we don't want our buffer to be full */
|
|
if( buffered > (p_aout->output.p_sys->max_buffer_duration
|
|
/ i_fragstotal * (i_fragstotal - 1)) )
|
|
{
|
|
msleep((p_aout->output.p_sys->max_buffer_duration
|
|
/ i_fragstotal ));
|
|
buffered = BufferDuration( p_aout );
|
|
}
|
|
#undef i_fragstotal
|
|
}
|
|
|
|
/* Next buffer will be played at mdate() + buffered */
|
|
p_buffer = aout_OutputNextBuffer( p_aout, mdate() + buffered,
|
|
VLC_FALSE );
|
|
|
|
if( p_buffer == NULL &&
|
|
buffered > ( p_aout->output.p_sys->max_buffer_duration
|
|
/ p_aout->output.p_sys->i_fragstotal ) )
|
|
{
|
|
/* If we have at least a fragment full, then we can wait a
|
|
* little and retry to get a new audio buffer instead of
|
|
* playing a blank sample */
|
|
msleep( ( p_aout->output.p_sys->max_buffer_duration
|
|
/ p_aout->output.p_sys->i_fragstotal / 2 ) );
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* emu10k1 driver does not report Buffer Duration correctly in
|
|
* passthrough mode so we have to cheat */
|
|
if( !next_date )
|
|
{
|
|
next_date = mdate();
|
|
}
|
|
else
|
|
{
|
|
mtime_t delay = next_date - mdate();
|
|
if( delay > AOUT_PTS_TOLERANCE )
|
|
{
|
|
msleep( delay / 2 );
|
|
}
|
|
}
|
|
|
|
while( !p_aout->b_die && ! ( p_buffer =
|
|
aout_OutputNextBuffer( p_aout, next_date, VLC_TRUE ) ) )
|
|
{
|
|
msleep( 1000 );
|
|
next_date = mdate();
|
|
}
|
|
}
|
|
|
|
if ( p_buffer != NULL )
|
|
{
|
|
p_bytes = p_buffer->p_buffer;
|
|
i_size = p_buffer->i_nb_bytes;
|
|
/* This is theoretical ... we'll see next iteration whether
|
|
* we're drifting */
|
|
next_date += p_buffer->end_date - p_buffer->start_date;
|
|
}
|
|
else
|
|
{
|
|
i_size = FRAME_SIZE / p_aout->output.output.i_frame_length
|
|
* p_aout->output.output.i_bytes_per_frame;
|
|
p_bytes = malloc( i_size );
|
|
memset( p_bytes, 0, i_size );
|
|
next_date = 0;
|
|
}
|
|
|
|
i_tmp = write( p_sys->i_fd, p_bytes, i_size );
|
|
|
|
if( i_tmp < 0 )
|
|
{
|
|
msg_Err( p_aout, "write failed (%m)" );
|
|
}
|
|
|
|
if ( p_buffer != NULL )
|
|
{
|
|
aout_BufferFree( p_buffer );
|
|
}
|
|
else
|
|
{
|
|
free( p_bytes );
|
|
}
|
|
}
|
|
|
|
return VLC_SUCCESS;
|
|
}
|