modules/audio_output/hd1000a.cpp

   1 /*****************************************************************************
   2  * hd1000a.cpp : Roku HD1000 audio output
   3  *****************************************************************************
   4  * Copyright (C) 2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Jon Lech Johansen <jon-vl@nanocrew.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 extern "C"
  28 {
  29 #include <errno.h>
  30
  31 #ifdef HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #include <vlc/vlc.h>
  36 #include <vlc_aout.h>
  37
  38 #include "aout_internal.h"
  39 }
  40
  41 #include <deschutes/libraries/hdmachinex225/PCMAudioPlayer.h>
  42
  43 #define FRAME_SIZE 4096
  44
  45 /*****************************************************************************
  46  * aout_sys_t: audio output method descriptor
  47  *****************************************************************************
  48  * This structure is part of the audio output thread descriptor.
  49  * It describes the direct sound specific properties of an audio device.
  50  *****************************************************************************/
  51 struct aout_sys_t
  52 {
  53     u32 nAlignment;
  54     u32 nSizeMultiple;
  55     u32 nBuffers;
  56     u32 nBufferSize;
  57     void ** ppBuffers;
  58     u32 nNextBufferIndex;
  59     PCMAudioPlayer * pPlayer;
  60 };
  61
  62 /*****************************************************************************
  63  * Local prototypes.
  64  *****************************************************************************/
  65 static int     Open        ( vlc_object_t * );
  66 static void    Close       ( vlc_object_t * );
  67
  68 static void    Play        ( aout_instance_t * );
  69 static int     Thread      ( aout_instance_t * );
  70
  71 static void    InterleaveS16( int16_t *, int16_t * );
  72
  73 /*****************************************************************************
  74  * Module descriptor
  75  *****************************************************************************/
  76 vlc_module_begin();
  77     set_shortname( "Roku HD1000" );
  78     set_description( _("Roku HD1000 audio output") );
  79     set_capability( "audio output", 100 );
  80     set_category( CAT_AUDIO );
  81     set_subcategory( SUBCAT_AUDIO_AOUT );
  82     set_callbacks( Open, Close );
  83 vlc_module_end();
  84
  85 /*****************************************************************************
  86  * Open: open a dummy audio device
  87  *****************************************************************************/
  88 static int Open( vlc_object_t * p_this )
  89 {
  90     aout_instance_t * p_aout = (aout_instance_t *)p_this;
  91     struct aout_sys_t * p_sys;
  92     PCMAudioPlayer * pPlayer;
  93     int i_volume;
  94
  95     /* Allocate structure */
  96     p_aout->output.p_sys = p_sys =
  97         (aout_sys_t *)malloc( sizeof( aout_sys_t ) );
  98     if( p_aout->output.p_sys == NULL )
  99     {
 100         msg_Err( p_aout, "out of memory" );
 101         return VLC_EGENERIC;
 102     }
 103
 104     /* New PCMAudioPlayer */
 105     p_sys->pPlayer = pPlayer = new PCMAudioPlayer();
 106     if( p_sys->pPlayer == NULL )
 107     {
 108         msg_Err( p_aout, "out of memory" );
 109         free( p_sys );
 110         return VLC_EGENERIC;
 111     }
 112
 113     /* Get Buffer Requirements */
 114     if( !pPlayer->GetBufferRequirements( p_sys->nAlignment,
 115                                          p_sys->nSizeMultiple,
 116                                          p_sys->nBuffers ) )
 117     {
 118         msg_Err( p_aout, "GetBufferRequirements failed" );
 119         delete pPlayer;
 120         free( p_sys );
 121         return VLC_EGENERIC;
 122     }
 123
 124     p_sys->nBuffers = __MIN( p_sys->nBuffers, 4 );
 125
 126     p_sys->ppBuffers = (void **)malloc( p_sys->nBuffers * sizeof( void * ) );
 127     if( p_sys->ppBuffers == NULL )
 128     {
 129         msg_Err( p_aout, "out of memory" );
 130         delete pPlayer;
 131         free( p_sys );
 132         return VLC_EGENERIC;
 133     }
 134
 135     /* Open PCMAudioPlayer */
 136     p_sys->nBufferSize = FRAME_SIZE * 4;
 137     if( !pPlayer->Open( p_sys->nBuffers, p_sys->nBufferSize,
 138                         p_sys->ppBuffers ) )
 139     {
 140         msg_Err( p_aout, "Open failed" );
 141         delete pPlayer;
 142         free( p_sys->ppBuffers );
 143         free( p_sys );
 144         return VLC_EGENERIC;
 145     }
 146
 147     p_sys->nNextBufferIndex = 0;
 148
 149     if( !pPlayer->SetSampleRate( p_aout->output.output.i_rate ) )
 150     {
 151         p_aout->output.output.i_rate = 44100;
 152         if( !pPlayer->SetSampleRate( p_aout->output.output.i_rate ) )
 153         {
 154             msg_Err( p_aout, "SetSampleRate failed" );
 155             pPlayer->Close();
 156             delete pPlayer;
 157             free( p_sys->ppBuffers );
 158             free( p_sys );
 159             return VLC_EGENERIC;
 160         }
 161     }
 162
 163     p_aout->output.output.i_format = AOUT_FMT_S16_NE;
 164     p_aout->output.i_nb_samples = FRAME_SIZE;
 165     p_aout->output.output.i_physical_channels
 166             = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 167     p_aout->output.pf_play = Play;
 168     aout_VolumeSoftInit( p_aout );
 169
 170     i_volume = config_GetInt( p_aout->p_libvlc, "volume" );
 171     pPlayer->SetVolume( (u32)__MIN( i_volume * 64, 0xFFFF ) );
 172
 173     /* Create thread and wait for its readiness. */
 174     if( vlc_thread_create( p_aout, "aout", Thread,
 175                            VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
 176     {
 177         msg_Err( p_aout, "cannot create OSS thread (%m)" );
 178         pPlayer->Close();
 179         delete pPlayer;
 180         free( p_sys->ppBuffers );
 181         free( p_sys );
 182         return VLC_ETHREAD;
 183     }
 184
 185     return VLC_SUCCESS;
 186 }
 187
 188 /*****************************************************************************
 189  * Close: close our file
 190  *****************************************************************************/
 191 static void Close( vlc_object_t * p_this )
 192 {
 193     u32 i;
 194     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 195     struct aout_sys_t * p_sys = p_aout->output.p_sys;
 196
 197     vlc_object_kill( p_aout );
 198     vlc_thread_join( p_aout );
 199     p_aout->b_die = VLC_FALSE;
 200
 201     do
 202     {
 203         i = p_sys->pPlayer->WaitForBuffer();
 204     } while( i != 0 && i != p_sys->nBuffers );
 205
 206     p_sys->pPlayer->Close();
 207     delete p_sys->pPlayer;
 208
 209     free( p_sys->ppBuffers );
 210     free( p_sys );
 211 }
 212
 213 /*****************************************************************************
 214  * Play: do nothing
 215  *****************************************************************************/
 216 static void Play( aout_instance_t * p_aout )
 217 {
 218 }
 219
 220 /*****************************************************************************
 221  * Thread: thread used to DMA the data to the device
 222  *****************************************************************************/
 223 static int Thread( aout_instance_t * p_aout )
 224 {
 225     aout_buffer_t * p_buffer;
 226     struct aout_sys_t * p_sys = p_aout->output.p_sys;
 227     PCMAudioPlayer * pPlayer = p_sys->pPlayer;
 228
 229     while( !p_aout->b_die )
 230     {
 231         pPlayer->WaitForBuffer();
 232
 233         vlc_mutex_lock( &p_aout->output_fifo_lock );
 234         p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 235         vlc_mutex_unlock( &p_aout->output_fifo_lock );
 236
 237 #define i p_sys->nNextBufferIndex
 238         if( p_buffer == NULL )
 239         {
 240             p_aout->p_libvlc->pf_memset( p_sys->ppBuffers[ i ], 0,
 241                                       p_sys->nBufferSize );
 242         }
 243         else
 244         {
 245             InterleaveS16( (int16_t *)p_buffer->p_buffer,
 246                            (int16_t *)p_sys->ppBuffers[ i ] );
 247             aout_BufferFree( p_buffer );
 248         }
 249
 250         if( !pPlayer->QueueBuffer( (s16 *)p_sys->ppBuffers[ i ],
 251                                    p_sys->nBufferSize / 2 ) )
 252         {
 253             msg_Err( p_aout, "QueueBuffer failed" );
 254         }
 255
 256         i = (i + 1) % p_sys->nBuffers;
 257 #undef i
 258     }
 259
 260     return VLC_SUCCESS;
 261 }
 262
 263 /*****************************************************************************
 264  * InterleaveS16: interleave samples
 265  *****************************************************************************/
 266 static void InterleaveS16( int16_t * p_in, int16_t * p_out )
 267 {
 268     for( int i = 0; i < FRAME_SIZE; i++ )
 269     {
 270         p_out[ i * 2 + 0 ] = p_in[ i * 2 + 1 ];
 271         p_out[ i * 2 + 1 ] = p_in[ i * 2 + 0 ];
 272     }
 273 }