hd1000a.cpp
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上传日期：2009-03-27
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- /*****************************************************************************
- * hd1000a.cpp : Roku HD1000 audio output
- *****************************************************************************
- * Copyright (C) 2004 VideoLAN
- * $Id: hd1000a.cpp 7107 2004-03-18 16:53:56Z jlj $
- *
- * Author: Jon Lech Johansen <jon-vl@nanocrew.net>
- *
- * 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
- *****************************************************************************/
- extern "C"
- {
- #include <string.h>
- #include <stdlib.h>
- #include <errno.h>
- #include <vlc/vlc.h>
- #include <vlc/aout.h>
- #include "aout_internal.h"
- }
- #include <deschutes/libraries/hdmachinex225/PCMAudioPlayer.h>
- #define FRAME_SIZE 4096
- /*****************************************************************************
- * aout_sys_t: audio output method descriptor
- *****************************************************************************
- * This structure is part of the audio output thread descriptor.
- * It describes the direct sound specific properties of an audio device.
- *****************************************************************************/
- struct aout_sys_t
- {
- u32 nAlignment;
- u32 nSizeMultiple;
- u32 nBuffers;
- u32 nBufferSize;
- void ** ppBuffers;
- u32 nNextBufferIndex;
- PCMAudioPlayer * pPlayer;
- };
- /*****************************************************************************
- * Local prototypes.
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close ( vlc_object_t * );
- static void Play ( aout_instance_t * );
- static int Thread ( aout_instance_t * );
- static void InterleaveS16( int16_t *, int16_t * );
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- vlc_module_begin();
- set_description( N_("HD1000 audio output") );
- set_capability( "audio output", 100 );
- set_callbacks( Open, Close );
- vlc_module_end();
- /*****************************************************************************
- * Open: open a dummy audio device
- *****************************************************************************/
- static int Open( vlc_object_t * p_this )
- {
- aout_instance_t * p_aout = (aout_instance_t *)p_this;
- struct aout_sys_t * p_sys;
- PCMAudioPlayer * pPlayer;
- int i_volume;
- /* Allocate structure */
- p_aout->output.p_sys = p_sys =
- (aout_sys_t *)malloc( sizeof( aout_sys_t ) );
- if( p_aout->output.p_sys == NULL )
- {
- msg_Err( p_aout, "out of memory" );
- return VLC_EGENERIC;
- }
- /* New PCMAudioPlayer */
- p_sys->pPlayer = pPlayer = new PCMAudioPlayer();
- if( p_sys->pPlayer == NULL )
- {
- msg_Err( p_aout, "out of memory" );
- free( p_sys );
- return VLC_EGENERIC;
- }
- /* Get Buffer Requirements */
- if( !pPlayer->GetBufferRequirements( p_sys->nAlignment,
- p_sys->nSizeMultiple,
- p_sys->nBuffers ) )
- {
- msg_Err( p_aout, "GetBufferRequirements failed" );
- delete pPlayer;
- free( p_sys );
- return VLC_EGENERIC;
- }
- p_sys->nBuffers = __MIN( p_sys->nBuffers, 4 );
- p_sys->ppBuffers = (void **)malloc( p_sys->nBuffers * sizeof( void * ) );
- if( p_sys->ppBuffers == NULL )
- {
- msg_Err( p_aout, "out of memory" );
- delete pPlayer;
- free( p_sys );
- return VLC_EGENERIC;
- }
- /* Open PCMAudioPlayer */
- p_sys->nBufferSize = FRAME_SIZE * 4;
- if( !pPlayer->Open( p_sys->nBuffers, p_sys->nBufferSize,
- p_sys->ppBuffers ) )
- {
- msg_Err( p_aout, "Open failed" );
- delete pPlayer;
- free( p_sys->ppBuffers );
- free( p_sys );
- return VLC_EGENERIC;
- }
- p_sys->nNextBufferIndex = 0;
- if( !pPlayer->SetSampleRate( p_aout->output.output.i_rate ) )
- {
- p_aout->output.output.i_rate = 44100;
- if( !pPlayer->SetSampleRate( p_aout->output.output.i_rate ) )
- {
- msg_Err( p_aout, "SetSampleRate failed" );
- pPlayer->Close();
- delete pPlayer;
- free( p_sys->ppBuffers );
- free( p_sys );
- return VLC_EGENERIC;
- }
- }
- p_aout->output.output.i_format = AOUT_FMT_S16_NE;
- p_aout->output.i_nb_samples = FRAME_SIZE;
- p_aout->output.output.i_physical_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- p_aout->output.pf_play = Play;
- aout_VolumeSoftInit( p_aout );
- i_volume = config_GetInt( p_aout->p_vlc, "volume" );
- pPlayer->SetVolume( (u32)__MIN( i_volume * 64, 0xFFFF ) );
- /* Create thread and wait for its readiness. */
- if( vlc_thread_create( p_aout, "aout", Thread,
- VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
- {
- msg_Err( p_aout, "cannot create OSS thread (%s)", strerror(errno) );
- pPlayer->Close();
- delete pPlayer;
- free( p_sys->ppBuffers );
- free( p_sys );
- return VLC_ETHREAD;
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Close: close our file
- *****************************************************************************/
- static void Close( vlc_object_t * p_this )
- {
- u32 i;
- 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 = VLC_TRUE;
- vlc_thread_join( p_aout );
- p_aout->b_die = VLC_FALSE;
- do
- {
- i = p_sys->pPlayer->WaitForBuffer();
- } while( i != 0 && i != p_sys->nBuffers );
- p_sys->pPlayer->Close();
- delete p_sys->pPlayer;
- free( p_sys->ppBuffers );
- free( p_sys );
- }
- /*****************************************************************************
- * Play: do nothing
- *****************************************************************************/
- static void Play( aout_instance_t * p_aout )
- {
- }
- /*****************************************************************************
- * Thread: thread used to DMA the data to the device
- *****************************************************************************/
- static int Thread( aout_instance_t * p_aout )
- {
- aout_buffer_t * p_buffer;
- struct aout_sys_t * p_sys = p_aout->output.p_sys;
- PCMAudioPlayer * pPlayer = p_sys->pPlayer;
- while( !p_aout->b_die )
- {
- pPlayer->WaitForBuffer();
- vlc_mutex_lock( &p_aout->output_fifo_lock );
- p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
- vlc_mutex_unlock( &p_aout->output_fifo_lock );
- #define i p_sys->nNextBufferIndex
- if( p_buffer == NULL )
- {
- p_aout->p_vlc->pf_memset( p_sys->ppBuffers[ i ], 0,
- p_sys->nBufferSize );
- }
- else
- {
- InterleaveS16( (int16_t *)p_buffer->p_buffer,
- (int16_t *)p_sys->ppBuffers[ i ] );
- aout_BufferFree( p_buffer );
- }
- if( !pPlayer->QueueBuffer( (s16 *)p_sys->ppBuffers[ i ],
- p_sys->nBufferSize / 2 ) )
- {
- msg_Err( p_aout, "QueueBuffer failed" );
- }
- i = (i + 1) % p_sys->nBuffers;
- #undef i
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * InterleaveS16: interleave samples
- *****************************************************************************/
- static void InterleaveS16( int16_t * p_in, int16_t * p_out )
- {
- for( int i = 0; i < FRAME_SIZE; i++ )
- {
- p_out[ i * 2 + 0 ] = p_in[ i * 2 + 1 ];
- p_out[ i * 2 + 1 ] = p_in[ i * 2 + 0 ];
- }
- }
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