static int sleep_until_start_request_or_inactivity()
{
SHOW_TIME("fifo > sleep_until_start_request_or_inactivity > ENTER");
int a_start_is_required=0;
// Wait for the start request (my_sem_start_is_required).
// Besides this, if the audio stream is still busy,
// check from time to time its end.
// The end of the stream is confirmed by several checks
// for filtering underflow.
//
int i=0;
while((i<= MAX_INACTIVITY_CHECK) && !a_start_is_required)
{
if (wave_is_busy( NULL) )
{
i = 0;
}
else
{
i++;
}
int err=0;
struct timespec ts;
struct timeval tv;
clock_gettime2( &ts);
#ifdef DEBUG_ENABLED
struct timespec to;
to.tv_sec = ts.tv_sec;
to.tv_nsec = ts.tv_nsec;
#endif
add_time_in_ms( &ts, INACTIVITY_TIMEOUT);
SHOW("fifo > sleep_until_start_request_or_inactivity > start sem_timedwait (start_is_required) from %d.%09lu to %d.%09lu \n",
to.tv_sec, to.tv_nsec,
ts.tv_sec, ts.tv_nsec);
while ((err = sem_timedwait(&my_sem_start_is_required, &ts)) == -1
&& errno == EINTR)
{
continue;
}
assert (gettimeofday(&tv, NULL) != -1);
SHOW("fifo > sleep_until_start_request_or_inactivity > stop sem_timedwait (start_is_required, err=%d) %d.%09lu \n", err,
tv.tv_sec, tv.tv_usec*1000);
if (err==0)
{
a_start_is_required = 1;
}
}
SHOW_TIME("fifo > sleep_until_start_request_or_inactivity > LEAVE");
return a_start_is_required;
}
ESPEAK_API int espeak_IsPlaying(void)
{//==================================
// ENTER("espeak_IsPlaying");
#ifdef USE_ASYNC
if((my_mode == AUDIO_OUTPUT_PLAYBACK) && wave_is_busy(my_audio))
return(1);
return(fifo_is_busy());
#else
return(0);
#endif
} // end of espeak_IsPlaying
static int get_remaining_time(uint32_t sample, uint32_t* time_in_ms, int* stop_is_required)
{
ENTER("get_remaining_time");
int err = 0;
*stop_is_required = 0;
int i=0;
for (i=0; i < MAX_ACTIVITY_CHECK && (*stop_is_required == 0); i++)
{
err = wave_get_remaining_time( sample, time_in_ms);
if (err || wave_is_busy(NULL) || (*time_in_ms == 0))
{ // if err, stream not available: quit
// if wave is busy, time_in_ms is known: quit
// if wave is not busy but remaining time == 0, event is reached: quit
break;
}
// stream opened but not active
//
// Several possible states:
// * the stream is opened but not yet started:
//
// wait for the start of stream
//
// * some samples have already been played,
// ** the end of stream is reached
// ** or there is an underrun
//
// wait for the close of stream
*stop_is_required = sleep_until_timeout_or_stop_request( ACTIVITY_TIMEOUT);
}
return err;
}
size_t wave_write(void* theHandler, char* theMono16BitsWaveBuffer, size_t theSize)
{
ENTER("wave_write");
size_t bytes_written = 0;
// space in ringbuffer for the sample needed: 1x mono channel but 2x for 1 stereo channel
size_t bytes_to_write = (out_channels==1) ? theSize : theSize*2;
my_stream_could_start = 0;
if(pa_stream == NULL)
{
SHOW_TIME("wave_write > wave_open_sound\n");
if (0 != wave_open_sound())
{
SHOW_TIME("wave_write > wave_open_sound fails!");
return 0;
}
my_stream_could_start=1;
}
else if (!wave_is_busy(NULL))
{
my_stream_could_start = 1;
}
assert(BUFFER_LENGTH >= bytes_to_write);
if (myWrite >= myBuffer + BUFFER_LENGTH)
{
myWrite = myBuffer;
} // end if (myWrite >= myBuffer + BUFFER_LENGTH)
size_t aTotalFreeMem=0;
char* aRead = myRead;
SHOW("wave_write > aRead=%x, myWrite=%x\n", (int)aRead, (int)myWrite);
while (1)
{
if (my_callback_is_output_enabled && (0==my_callback_is_output_enabled()))
{
SHOW_TIME("wave_write > my_callback_is_output_enabled: no!");
return 0;
}
aRead = myRead;
// write pointer is before read pointer?
if (myWrite >= aRead)
{
aTotalFreeMem = aRead + BUFFER_LENGTH - myWrite;
}
else // read pointer is before write pointer!
{
aTotalFreeMem = aRead - myWrite;
} // end if (myWrite >= aRead)
if (aTotalFreeMem>1)
{
// -1 because myWrite must be different of aRead
// otherwise buffer would be considered as empty
aTotalFreeMem -= 1;
} // end if (aTotalFreeMem>1)
if (aTotalFreeMem >= bytes_to_write)
{
break;
} // end if (aTotalFreeMem >= bytes_to_write)
//SHOW_TIME("wave_write > wait");
SHOW("wave_write > wait: aTotalFreeMem=%d\n", aTotalFreeMem);
SHOW("wave_write > aRead=%x, myWrite=%x\n", (int)aRead, (int)myWrite);
usleep(10000);
} // end while (1)
aRead = myRead;
// write pointer is ahead the read pointer?
if (myWrite >= aRead)
{
SHOW_TIME("wave_write > myWrite >= aRead");
// determine remaining free memory to the end of the ringbuffer
size_t aFreeMem = myBuffer + BUFFER_LENGTH - myWrite;
// is enough linear space available (regardless 1 or 2 channels)?
if (aFreeMem >= bytes_to_write)
{
// copy direct - no wrap around at end of ringbuffer needed
myWrite += copyBuffer(myWrite, theMono16BitsWaveBuffer, theSize);
}
else // not enough linear space available
{
// 2 channels (stereo)?
if (out_channels == 2)
{
// copy with wrap around at the end of ringbuffer
copyBuffer(myWrite, theMono16BitsWaveBuffer, aFreeMem/2);
myWrite = myBuffer;
myWrite += copyBuffer(myWrite, theMono16BitsWaveBuffer+aFreeMem/2, theSize - aFreeMem/2);
}
else // 1 channel (mono)
{
// copy with wrap around at the end of ringbuffer
copyBuffer(myWrite, theMono16BitsWaveBuffer, aFreeMem);
myWrite = myBuffer;
myWrite += copyBuffer(myWrite, theMono16BitsWaveBuffer+aFreeMem, theSize - aFreeMem);
} // end if (out_channels == 2)
} // end if (aFreeMem >= bytes_to_write)
} // if (myWrite >= aRead)
else // read pointer is ahead the write pointer
{
SHOW_TIME("wave_write > myWrite <= aRead");
myWrite += copyBuffer(myWrite, theMono16BitsWaveBuffer, theSize);
} // end if (myWrite >= aRead)
bytes_written = bytes_to_write;
myWritePosition += theSize/sizeof(uint16_t); // add number of samples
if (my_stream_could_start && (get_used_mem() >= out_channels * sizeof(uint16_t) * FRAMES_PER_BUFFER))
{
start_stream();
} // end if (my_stream_could_start && (get_used_mem() >= out_channels * sizeof(uint16_t) * FRAMES_PER_BUFFER))
SHOW_TIME("wave_write > LEAVE");
return bytes_written;
}
