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239 lines
8.1 KiB
239 lines
8.1 KiB
/*****************************************************************************
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* arts.c : aRts module
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*****************************************************************************
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* Copyright (C) 2001-2002 VideoLAN
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* $Id: arts.c,v 1.12 2002/09/30 11:05:35 sam Exp $
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*
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* Authors: Emmanuel Blindauer <manu@agat.net>
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* Samuel Hocevar <sam@zoy.org>
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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., 59 Temple Place - Suite 330, Boston, MA 02111, 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 <string.h> /* strerror() */
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#include <unistd.h> /* write(), close() */
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#include <stdlib.h> /* calloc(), malloc(), free() */
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#include <vlc/vlc.h>
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#include <vlc/aout.h>
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#include "aout_internal.h"
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#include <artsc.h>
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/*****************************************************************************
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* aout_sys_t: arts 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 some arts specific variables.
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*****************************************************************************/
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struct aout_sys_t
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{
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arts_stream_t stream;
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mtime_t latency;
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int i_size;
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};
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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 aRtsThread ( aout_instance_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("aRts audio module") );
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set_capability( "audio output", 50 );
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set_callbacks( Open, Close );
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vlc_module_end();
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/*****************************************************************************
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* Open: open an aRts socket
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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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int i_err;
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/* Allocate structure */
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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 -1;
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}
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p_aout->output.p_sys = p_sys;
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i_err = arts_init();
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if (i_err < 0)
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{
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msg_Err( p_aout, "arts_init failed (%s)", arts_error_text(i_err) );
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free( p_sys );
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return -1;
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}
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p_aout->output.pf_play = Play;
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aout_VolumeSoftInit( p_aout );
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p_sys->stream = NULL;
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if( p_sys->stream )
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{
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arts_close_stream( p_sys->stream );
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}
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/* Open a socket for playing a stream, set format to 16 bits */
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p_sys->stream = arts_play_stream( p_aout->output.output.i_rate, 16,
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p_aout->output.output.i_channels, "vlc" );
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if( p_sys->stream == NULL )
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{
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msg_Err( p_aout, "cannot open aRts socket" );
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return -1;
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}
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/* Try not to bufferize more than 200 ms */
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arts_stream_set( p_sys->stream, ARTS_P_BUFFER_TIME, 50 );
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/* Estimate latency with a half full buffer */
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p_sys->latency = (mtime_t)1000
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* (mtime_t)arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY );
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p_sys->i_size = arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE );
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msg_Dbg( p_aout, "aRts initialized, latency %i000, %i packets of size %i\n",
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arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY ),
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arts_stream_get( p_sys->stream, ARTS_P_PACKET_COUNT ),
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arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE ) );
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p_aout->output.output.i_format = AOUT_FMT_S16_NE;
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p_aout->output.i_nb_samples = p_sys->i_size
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/ sizeof(u16)
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/ p_aout->output.output.i_channels;
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/* Create aRts thread and wait for its readiness. */
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if( vlc_thread_create( p_aout, "aout", aRtsThread,
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VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
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{
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msg_Err( p_aout, "cannot create aRts thread (%s)", strerror(errno) );
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free( p_sys );
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return -1;
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}
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return 0;
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}
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/*****************************************************************************
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* Play: nothing to do
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*****************************************************************************/
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static void Play( aout_instance_t *p_aout )
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{
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;
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}
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/*****************************************************************************
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* Close: close the aRts socket
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*****************************************************************************/
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static void Close( 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 = p_aout->output.p_sys;
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p_aout->b_die = 1;
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vlc_thread_join( p_aout );
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if( p_sys->stream )
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{
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arts_close_stream( p_sys->stream );
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}
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arts_free();
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free( p_sys );
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}
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/*****************************************************************************
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* aRtsThread: asynchronous thread used to DMA the data to the device
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*****************************************************************************/
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static int aRtsThread( 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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mtime_t calldate = mdate();
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while ( !p_aout->b_die )
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{
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aout_buffer_t * p_buffer;
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int i_tmp, i_size;
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byte_t * p_bytes;
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fprintf(stderr, "can write %i\n", arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) );
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while( arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) < 16384*3/2 )
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{
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fprintf(stderr, "sleep\n");
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msleep( 10000 );
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}
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fprintf(stderr, "after sleep: can write %i\n", arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) );
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/* Get the presentation date of the next write() operation. It
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* is equal to the current date + latency */
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p_buffer = aout_OutputNextBuffer( p_aout, mdate() + p_sys->latency / 4,
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VLC_TRUE );
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if ( p_buffer != NULL )
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{
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fprintf(stderr, "buffer duration %lld, bytes %i\n", p_buffer->end_date - p_buffer->start_date, p_buffer->i_nb_bytes);
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p_bytes = p_buffer->p_buffer;
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i_size = p_buffer->i_nb_bytes;
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}
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else
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{
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i_size = p_sys->i_size;
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p_bytes = malloc( i_size );
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memset( p_bytes, 0, i_size );
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}
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fprintf(stderr, "WRITING %i bytes\n", i_size);
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i_tmp = arts_write( p_sys->stream, p_bytes, i_size );
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fprintf(stderr, "mdate: %lld\n", mdate() - calldate);
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calldate = mdate();
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fprintf(stderr, "can write %i\n", arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) );
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if( i_tmp < 0 )
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{
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msg_Err( p_aout, "write failed (%s)", arts_error_text(i_tmp) );
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}
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if ( p_buffer != NULL )
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{
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aout_BufferFree( p_buffer );
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}
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else
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{
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free( p_bytes );
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}
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}
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return 0;
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}
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