/*****************************************************************************
* kai.c : KAI audio output plugin for vlc
*****************************************************************************
- * Copyright (C) 2010 VLC authors and VideoLAN
+ * Copyright (C) 2010-2013 VLC authors and VideoLAN
*
* Authors: KO Myung-Hun <komh@chollian.net>
*
#define FRAME_SIZE 2048
+#define AUDIO_BUFFER_SIZE_IN_SECONDS ( AOUT_MAX_ADVANCE_TIME / CLOCK_FREQ )
+
+struct audio_buffer_t
+{
+ uint8_t *data;
+ int read_pos;
+ int write_pos;
+ int length;
+ int size;
+ vlc_mutex_t mutex;
+ vlc_cond_t cond;
+};
+
+typedef struct audio_buffer_t audio_buffer_t;
+
/*****************************************************************************
* aout_sys_t: KAI audio output method descriptor
*****************************************************************************
*****************************************************************************/
struct aout_sys_t
{
- aout_packet_t packet;
+ audio_buffer_t *buffer;
HKAI hkai;
float soft_gain;
bool soft_mute;
/*****************************************************************************
* Local prototypes
*****************************************************************************/
-static int Open ( vlc_object_t * );
-static void Close ( vlc_object_t * );
-static void Play ( audio_output_t *_p_aout, block_t *block );
+static int Open ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+static void Play ( audio_output_t *_p_aout, block_t *block );
+static void Pause ( audio_output_t *, bool, mtime_t );
+static void Flush ( audio_output_t *, bool );
+static int TimeGet ( audio_output_t *, mtime_t *restrict );
static ULONG APIENTRY KaiCallback ( PVOID, PVOID, ULONG );
-#include "volume.h"
+static int CreateBuffer ( audio_output_t *, int );
+static void DestroyBuffer( audio_output_t * );
+static int ReadBuffer ( audio_output_t *, uint8_t *, int );
+static int WriteBuffer ( audio_output_t *, uint8_t *, int );
+
+#include "audio_output/volume.h"
/*****************************************************************************
* Module descriptor
vlc_value_t val, text;
audio_sample_format_t format = *fmt;
- if( var_Get( p_aout, "audio-device", &val ) != VLC_ENOVAR )
- {
- /* The user has selected an audio device. */
- if ( val.i_int == AOUT_VAR_STEREO )
- {
- format.i_physical_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- }
- else if ( val.i_int == AOUT_VAR_MONO )
- {
- format.i_physical_channels = AOUT_CHAN_CENTER;
- }
- }
-
psz_mode = var_InheritString( p_aout, "kai-audio-device" );
if( !psz_mode )
psz_mode = ( char * )ppsz_kai_audio_device[ 0 ]; // "auto"
free( psz_mode );
i_nb_channels = aout_FormatNbChannels( &format );
- if ( i_nb_channels > 2 )
+ if ( i_nb_channels >= 2 )
{
/* KAI doesn't support more than two channels. */
i_nb_channels = 2;
- format.i_physical_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ format.i_physical_channels = AOUT_CHANS_STEREO;
}
+ else
+ format.i_physical_channels = AOUT_CHAN_CENTER;
- /* Support s16l only */
- format.i_format = VLC_CODEC_S16L;
+ /* Support S16 only */
+ format.i_format = VLC_CODEC_S16N;
aout_FormatPrepare( &format );
p_sys->format = *fmt = format;
- p_aout->time_get = aout_PacketTimeGet;
- p_aout->play = Play;
- p_aout->pause = NULL;
- p_aout->flush = aout_PacketFlush;
+ p_aout->time_get = TimeGet;
+ p_aout->play = Play;
+ p_aout->pause = Pause;
+ p_aout->flush = Flush;
aout_SoftVolumeStart( p_aout );
- aout_PacketInit( p_aout, &p_sys->packet,
- ks_obtained.ulBufferSize / i_bytes_per_frame, &format );
-
- if ( var_Type( p_aout, "audio-device" ) == 0 )
- {
- /* First launch. */
- var_Create( p_aout, "audio-device",
- VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
- text.psz_string = _("Audio Device");
- var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
-
- val.i_int = AOUT_VAR_STEREO;
- text.psz_string = _("Stereo");
- var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
- val.i_int = AOUT_VAR_MONO;
- text.psz_string = _("Mono");
- var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
- if ( i_nb_channels == 2 )
- {
- val.i_int = AOUT_VAR_STEREO;
- }
- else
- {
- val.i_int = AOUT_VAR_MONO;
- }
- var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
- var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
- }
+ CreateBuffer( p_aout, AUDIO_BUFFER_SIZE_IN_SECONDS *
+ format.i_rate * format.i_bytes_per_frame );
/* Prevent SIG_FPE */
_control87(MCW_EM, MCW_EM);
kaiPlay( p_sys->hkai );
- aout_PacketPlay( p_aout, block );
+ WriteBuffer( p_aout, block->p_buffer, block->i_buffer );
+
+ block_Release( block );
}
/*****************************************************************************
kaiClose( p_sys->hkai );
kaiDone();
- aout_PacketDestroy( p_aout );
+ DestroyBuffer( p_aout );
}
/*****************************************************************************
ULONG i_buf_size )
{
audio_output_t *p_aout = (audio_output_t *)p_cb_data;
- aout_sys_t *sys = p_aout->sys;
- block_t *p_aout_buffer;
- mtime_t current_date, next_date;
- ULONG i_len;
-
- /* We have 2 buffers, and a callback function is called right after KAI
- * runs out of a buffer. So we should get a packet to be played after the
- * remaining buffer.
- */
- next_date = mdate() + ( i_buf_size * 1000000LL
- / sys->format.i_bytes_per_frame
- / sys->format.i_rate
- * sys->format.i_frame_length );
+ int i_len;
- for (i_len = 0; i_len < i_buf_size;)
- {
- current_date = mdate();
- if( next_date < current_date )
- next_date = current_date;
-
- /* Get the next audio data buffer */
- p_aout_buffer = aout_PacketNext( p_aout, next_date );
-
- if( p_aout_buffer == NULL )
- {
- /* Means we are too early to request a new buffer ?
- * Try once again.
- */
- msleep( AOUT_MIN_PREPARE_TIME );
- next_date = mdate();
- p_aout_buffer = aout_PacketNext( p_aout, next_date );
- }
-
- if ( p_aout_buffer != NULL )
- {
- memcpy( ( uint8_t * ) p_buffer + i_len,
- p_aout_buffer->p_buffer,
- p_aout_buffer->i_buffer );
-
- i_len += p_aout_buffer->i_buffer;
-
- next_date += p_aout_buffer->i_length;
-
- block_Release( p_aout_buffer );
- }
- else
- {
- memset( ( uint8_t * ) p_buffer + i_len, 0, i_buf_size - i_len );
-
- i_len = i_buf_size;
- }
- }
+ i_len = ReadBuffer( p_aout, p_buffer, i_buf_size );
+ if(( ULONG )i_len < i_buf_size )
+ memset(( uint8_t * )p_buffer + i_len, 0, i_buf_size - i_len );
return i_buf_size;
}
free(sys);
}
+
+static void Pause( audio_output_t *aout, bool pause, mtime_t date )
+{
+ VLC_UNUSED( date );
+
+ aout_sys_t *sys = aout->sys;
+
+ if( pause )
+ kaiPause( sys->hkai );
+ else
+ kaiResume( sys->hkai );
+}
+
+static void Flush( audio_output_t *aout, bool drain )
+{
+ audio_buffer_t *buffer = aout->sys->buffer;
+
+ vlc_mutex_lock( &buffer->mutex );
+
+ if( drain )
+ {
+ while( buffer->length > 0 )
+ vlc_cond_wait( &buffer->cond, &buffer->mutex );
+ }
+ else
+ {
+ buffer->read_pos = buffer->write_pos;
+ buffer->length = 0;
+ }
+
+ vlc_mutex_unlock( &buffer->mutex );
+}
+
+static int TimeGet( audio_output_t *aout, mtime_t *restrict delay )
+{
+ aout_sys_t *sys = aout->sys;
+ audio_sample_format_t *format = &sys->format;
+ audio_buffer_t *buffer = sys->buffer;
+
+ vlc_mutex_lock( &buffer->mutex );
+
+ *delay = ( buffer->length / format->i_bytes_per_frame ) * CLOCK_FREQ /
+ format->i_rate;
+
+ vlc_mutex_unlock( &buffer->mutex );
+
+ return 0;
+}
+
+static int CreateBuffer( audio_output_t *aout, int size )
+{
+ audio_buffer_t *buffer;
+
+ buffer = calloc( 1, sizeof( *buffer ));
+ if( !buffer )
+ return -1;
+
+ buffer->data = malloc( size );
+ if( !buffer->data )
+ {
+ free( buffer );
+
+ return -1;
+ }
+
+ buffer->size = size;
+
+ vlc_mutex_init( &buffer->mutex );
+ vlc_cond_init( &buffer->cond );
+
+ aout->sys->buffer = buffer;
+
+ return 0;
+}
+
+static void DestroyBuffer( audio_output_t *aout )
+{
+ audio_buffer_t *buffer = aout->sys->buffer;
+
+ vlc_mutex_destroy( &buffer->mutex );
+ vlc_cond_destroy( &buffer->cond );
+
+ free( buffer->data );
+ free( buffer );
+}
+
+static int ReadBuffer( audio_output_t *aout, uint8_t *data, int size )
+{
+ audio_buffer_t *buffer = aout->sys->buffer;
+ int len;
+ int remain_len = 0;
+
+ vlc_mutex_lock( &buffer->mutex );
+
+ len = MIN( buffer->length, size );
+ if( buffer->read_pos + len > buffer->size )
+ {
+ remain_len = len;
+ len = buffer->size - buffer->read_pos;
+ remain_len -= len;
+ }
+
+ memcpy( data, buffer->data + buffer->read_pos, len );
+ if( remain_len )
+ memcpy( data + len, buffer->data, remain_len );
+
+ len += remain_len;
+
+ buffer->read_pos += len;
+ buffer->read_pos %= buffer->size;
+
+ buffer->length -= len;
+
+ vlc_cond_signal( &buffer->cond );
+
+ vlc_mutex_unlock( &buffer->mutex );
+
+ return len;
+}
+
+static int WriteBuffer( audio_output_t *aout, uint8_t *data, int size )
+{
+ audio_buffer_t *buffer = aout->sys->buffer;
+ int len;
+ int remain_len = 0;
+
+ vlc_mutex_lock( &buffer->mutex );
+
+ /* FIXME :
+ * If size is larger than buffer->size, this is locked indefinitely.
+ */
+ while( buffer->length + size > buffer->size )
+ vlc_cond_wait( &buffer->cond, &buffer->mutex );
+
+ len = size;
+ if( buffer->write_pos + len > buffer->size )
+ {
+ remain_len = len;
+ len = buffer->size - buffer->write_pos;
+ remain_len -= len;
+ }
+
+ memcpy( buffer->data + buffer->write_pos, data, len );
+ if( remain_len )
+ memcpy( buffer->data, data + len, remain_len );
+
+ buffer->write_pos += size;
+ buffer->write_pos %= buffer->size;
+
+ buffer->length += size;
+
+ vlc_mutex_unlock( &buffer->mutex );
+
+ return size;
+}
projects / vlc / blobdiff