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