--- /dev/null
+/*****************************************************************************
+ * opensles_android.c : audio output for android native code
+ *****************************************************************************
+ * Copyright © 2011 VideoLAN
+ *
+ * Authors: Dominique Martinet <asmadeus@codewreck.org>
+ * Hugo Beauzée-Luyssen <beauze.h@gmail.com>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_aout.h>
+#include <assert.h>
+#include <dlfcn.h>
+
+// For native audio
+#include <SLES/OpenSLES.h>
+#include <SLES/OpenSLES_Android.h>
+
+// Maximum number of buffers to enqueue.
+#define BUFF_QUEUE 42
+
+/*****************************************************************************
+ * 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
+{
+ SLObjectItf engineObject;
+ SLEngineItf engineEngine;
+ SLObjectItf outputMixObject;
+ SLAndroidSimpleBufferQueueItf playerBufferQueue;
+ SLObjectItf playerObject;
+ SLPlayItf playerPlay;
+ aout_buffer_t * p_buffer_array[BUFF_QUEUE];
+ int i_toclean_buffer;
+ int i_toappend_buffer;
+ SLInterfaceID * SL_IID_ENGINE;
+ SLInterfaceID * SL_IID_ANDROIDSIMPLEBUFFERQUEUE;
+ SLInterfaceID * SL_IID_VOLUME;
+ SLInterfaceID * SL_IID_PLAY;
+ void * p_so_handle;
+};
+
+typedef SLresult (*slCreateEngine_t)(
+ SLObjectItf*, SLuint32, const SLEngineOption*, SLuint32,
+ const SLInterfaceID*, const SLboolean* );
+
+/*****************************************************************************
+ * Local prototypes.
+ *****************************************************************************/
+static int Open ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+static void Play ( aout_instance_t * );
+static void PlayedCallback ( SLAndroidSimpleBufferQueueItf caller, void *pContext);
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+
+vlc_module_begin ()
+ set_description( N_("OpenSLES audio output") )
+ set_shortname( N_("OpenSLES") )
+ set_category( CAT_AUDIO )
+ set_subcategory( SUBCAT_AUDIO_AOUT )
+
+ set_capability( "audio output", 170 )
+ add_shortcut( "opensles", "android" )
+ set_callbacks( Open, Close )
+vlc_module_end ()
+
+
+#define CHECK_OPENSL_ERROR( res, msg ) \
+ if( unlikely( res != SL_RESULT_SUCCESS ) ) \
+ { \
+ msg_Err( p_aout, msg" (%lu)", res ); \
+ goto error; \
+ }
+
+#define OPENSL_DLSYM( dest, handle, name ) \
+ dest = (typeof(dest))dlsym( handle, name ); \
+ if( dest == NULL ) \
+ { \
+ msg_Err( p_aout, "Failed to load symbol %s", name ); \
+ goto error; \
+ }
+
+static void Clear( aout_sys_t *p_sys )
+{
+ // Destroy buffer queue audio player object
+ // and invalidate all associated interfaces
+ if( p_sys->playerObject != NULL )
+ (*p_sys->playerObject)->Destroy( p_sys->playerObject );
+
+ // destroy output mix object, and invalidate all associated interfaces
+ if( p_sys->outputMixObject != NULL )
+ (*p_sys->outputMixObject)->Destroy( p_sys->outputMixObject );
+
+ // destroy engine object, and invalidate all associated interfaces
+ if( p_sys->engineObject != NULL )
+ (*p_sys->engineObject)->Destroy( p_sys->engineObject );
+
+ if( p_sys->p_so_handle != NULL )
+ dlclose( p_sys->p_so_handle );
+
+ free( p_sys );
+}
+
+/*****************************************************************************
+ * Open: open a dummy audio device
+ *****************************************************************************/
+static int Open( vlc_object_t * p_this )
+{
+ aout_instance_t *p_aout = (aout_instance_t *)p_this;
+ SLresult result;
+
+ /* Allocate structure */
+ p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
+ if( unlikely( p_aout->output.p_sys == NULL ) )
+ return VLC_ENOMEM;
+
+ aout_sys_t * p_sys = p_aout->output.p_sys;
+
+ p_sys->playerObject = NULL;
+ p_sys->engineObject = NULL;
+ p_sys->outputMixObject = NULL;
+ p_sys->i_toclean_buffer = 0;
+ p_sys->i_toappend_buffer= 0;
+
+ //Acquiring LibOpenSLES symbols :
+ p_sys->p_so_handle = dlopen( "libOpenSLES.so", RTLD_NOW );
+ if( p_sys->p_so_handle == NULL )
+ {
+ msg_Err( p_aout, "Failed to load libOpenSLES" );
+ goto error;
+ }
+
+ slCreateEngine_t slCreateEnginePtr = NULL;
+
+ OPENSL_DLSYM( slCreateEnginePtr, p_sys->p_so_handle, "slCreateEngine" );
+ OPENSL_DLSYM( p_sys->SL_IID_ANDROIDSIMPLEBUFFERQUEUE, p_sys->p_so_handle,
+ "SL_IID_ANDROIDSIMPLEBUFFERQUEUE" );
+ OPENSL_DLSYM( p_sys->SL_IID_ENGINE, p_sys->p_so_handle, "SL_IID_ENGINE" );
+ OPENSL_DLSYM( p_sys->SL_IID_PLAY, p_sys->p_so_handle, "SL_IID_PLAY" );
+ OPENSL_DLSYM( p_sys->SL_IID_VOLUME, p_sys->p_so_handle, "SL_IID_VOLUME" );
+
+ // create engine
+ result = slCreateEnginePtr( &p_sys->engineObject, 0, NULL, 0, NULL, NULL );
+ CHECK_OPENSL_ERROR( result, "Failed to create engine" );
+
+ // realize the engine in synchronous mode
+ result = (*p_sys->engineObject)->Realize( p_sys->engineObject,
+ SL_BOOLEAN_FALSE );
+ CHECK_OPENSL_ERROR( result, "Failed to realize engine" );
+
+ // get the engine interface, needed to create other objects
+ result = (*p_sys->engineObject)->GetInterface( p_sys->engineObject,
+ *p_sys->SL_IID_ENGINE, &p_sys->engineEngine );
+ CHECK_OPENSL_ERROR( result, "Failed to get the engine interface" );
+
+ // create output mix, with environmental reverb specified as a non-required interface
+ const SLInterfaceID ids1[] = { *p_sys->SL_IID_VOLUME };
+ const SLboolean req1[] = { SL_BOOLEAN_FALSE };
+ result = (*p_sys->engineEngine)->CreateOutputMix( p_sys->engineEngine,
+ &p_sys->outputMixObject, 1, ids1, req1 );
+ CHECK_OPENSL_ERROR( result, "Failed to create output mix" );
+
+ // realize the output mix in synchronous mode
+ result = (*p_sys->outputMixObject)->Realize( p_sys->outputMixObject,
+ SL_BOOLEAN_FALSE );
+ CHECK_OPENSL_ERROR( result, "Failed to realize output mix" );
+
+
+ // configure audio source - this defines the number of samples you can enqueue.
+ SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {
+ SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,
+ BUFF_QUEUE
+ };
+
+ SLDataFormat_PCM format_pcm;
+ format_pcm.formatType = SL_DATAFORMAT_PCM;
+ format_pcm.numChannels = 2;
+ format_pcm.samplesPerSec = ((SLuint32) p_aout->output.output.i_rate * 1000) ;
+ format_pcm.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
+ format_pcm.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
+ format_pcm.channelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
+ format_pcm.endianness = SL_BYTEORDER_LITTLEENDIAN;
+
+ SLDataSource audioSrc = {&loc_bufq, &format_pcm};
+
+ // configure audio sink
+ SLDataLocator_OutputMix loc_outmix = {
+ SL_DATALOCATOR_OUTPUTMIX,
+ p_sys->outputMixObject
+ };
+ SLDataSink audioSnk = {&loc_outmix, NULL};
+
+ //create audio player
+ const SLInterfaceID ids2[] = { *p_sys->SL_IID_ANDROIDSIMPLEBUFFERQUEUE };
+ const SLboolean req2[] = { SL_BOOLEAN_TRUE };
+ result = (*p_sys->engineEngine)->CreateAudioPlayer( p_sys->engineEngine,
+ &p_sys->playerObject, &audioSrc,
+ &audioSnk, sizeof( ids2 ) / sizeof( *ids2 ),
+ ids2, req2 );
+ CHECK_OPENSL_ERROR( result, "Failed to create audio player" );
+
+ // realize the player
+ result = (*p_sys->playerObject)->Realize( p_sys->playerObject,
+ SL_BOOLEAN_FALSE );
+ CHECK_OPENSL_ERROR( result, "Failed to realize player object." );
+
+ // get the play interface
+ result = (*p_sys->playerObject)->GetInterface( p_sys->playerObject,
+ *p_sys->SL_IID_PLAY, &p_sys->playerPlay );
+ CHECK_OPENSL_ERROR( result, "Failed to get player interface." );
+
+ // get the buffer queue interface
+ result = (*p_sys->playerObject)->GetInterface( p_sys->playerObject,
+ *p_sys->SL_IID_ANDROIDSIMPLEBUFFERQUEUE,
+ &p_sys->playerBufferQueue );
+ CHECK_OPENSL_ERROR( result, "Failed to get buff queue interface" );
+
+ result = (*p_sys->playerBufferQueue)->RegisterCallback( p_sys->playerBufferQueue,
+ PlayedCallback,
+ (void*)p_sys);
+ CHECK_OPENSL_ERROR( result, "Failed to register buff queue callback." );
+
+
+ // set the player's state to playing
+ result = (*p_sys->playerPlay)->SetPlayState( p_sys->playerPlay,
+ SL_PLAYSTATE_PLAYING );
+ CHECK_OPENSL_ERROR( result, "Failed to switch to playing state" );
+
+ // we want 16bit signed data little endian.
+ p_aout->output.output.i_format = VLC_CODEC_S16L;
+ p_aout->output.i_nb_samples = 2048;
+ p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ p_aout->output.pf_play = Play;
+
+ aout_FormatPrepare( &p_aout->output.output );
+
+ return VLC_SUCCESS;
+error:
+ Clear( p_sys );
+ return VLC_EGENERIC;
+}
+
+/*****************************************************************************
+ * Close: close our file
+ *****************************************************************************/
+static void Close( vlc_object_t * p_this )
+{
+ aout_instance_t *p_aout = (aout_instance_t *)p_this;
+ aout_sys_t *p_sys = p_aout->output.p_sys;
+
+ msg_Dbg( p_aout, "Closing OpenSLES" );
+
+ (*p_sys->playerPlay)->SetPlayState( p_sys->playerPlay, SL_PLAYSTATE_STOPPED );
+ //Flush remaining buffers if any.
+ if( p_sys->playerBufferQueue != NULL )
+ (*p_sys->playerBufferQueue)->Clear( p_sys->playerBufferQueue );
+ Clear( p_sys );
+}
+
+/*****************************************************************************
+ * Play: play a sound
+ *****************************************************************************/
+static void Play( aout_instance_t * p_aout )
+{
+ aout_sys_t * p_sys = p_aout->output.p_sys;
+ aout_buffer_t *p_buffer;
+
+ SLresult result;
+
+ p_buffer = aout_FifoPop(&p_aout->output.fifo);
+ if( p_buffer != NULL )
+ {
+ for (;;)
+ {
+ result = (*p_sys->playerBufferQueue)->Enqueue(
+ p_sys->playerBufferQueue, p_buffer->p_buffer,
+ p_buffer->i_buffer );
+ if( result == SL_RESULT_SUCCESS )
+ break;
+ if ( result != SL_RESULT_BUFFER_INSUFFICIENT )
+ {
+ msg_Warn( p_aout, "Dropping invalid buffer" );
+ aout_BufferFree( p_buffer );
+ return ;
+ }
+
+ msg_Err( p_aout, "write error (%lu)", result );
+
+ // Wait a bit to retry. might miss calls to *cancel
+ // but this is supposed to be rare anyway
+ msleep(CLOCK_FREQ);
+ }
+ p_sys->p_buffer_array[p_sys->i_toappend_buffer] = p_buffer;
+ if( ++p_sys->i_toappend_buffer == BUFF_QUEUE )
+ p_sys->i_toappend_buffer = 0;
+ }
+ else
+ msg_Err( p_aout, "nothing to play?" );
+}
+
+static void PlayedCallback (SLAndroidSimpleBufferQueueItf caller, void *pContext )
+{
+ aout_sys_t *p_sys = (aout_sys_t*)pContext;
+
+ assert (caller == p_sys->playerBufferQueue);
+
+ aout_BufferFree( p_sys->p_buffer_array[p_sys->i_toclean_buffer] );
+ if( ++p_sys->i_toclean_buffer == BUFF_QUEUE )
+ p_sys->i_toclean_buffer = 0;
+}
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