static void start_tracking_thread(void)
{
if (s_tracking_enabled)
return;
s_tracking_enabled = true;
sys_start_thread(&s_tracking_thread, device_tracking_thread);
}
/**
* start_channel: Allocate a new channel and starts playback.
*
* [Parameters]
* buffer_desc: Playback buffer descriptor
* [Return value]
* Nonzero on success, zero on error
*/
static int start_channel(PSPSoundBufferDesc *buffer_desc)
{
if (!buffer_desc) {
DMSG("buffer_desc == NULL");
return 0;
}
if (buffer_desc->started) {
DMSG("Buffer is already started!");
return 0;
}
/* Allocate a hardware channel */
buffer_desc->channel = sceAudioChReserve(
PSP_AUDIO_NEXT_CHANNEL, BUFFER_SIZE, PSP_AUDIO_FORMAT_STEREO
);
if (buffer_desc->channel < 0) {
DMSG("Failed to allocate channel: %s",
psp_strerror(buffer_desc->channel));
return 0;
}
/* Initialize the ring buffer */
buffer_desc->cur_play = NUM_BUFFERS - 1;
buffer_desc->next_play = 0;
buffer_desc->next_write = 0;
int i;
for (i = 0; i < NUM_BUFFERS; i++) {
buffer_desc->write_ready[i] = 1;
}
buffer_desc->stop = 0;
/* Also write everything out of the cache so it's ready for the ME */
sceKernelDcacheWritebackAll();
/* Start the playback thread */
char thname[100];
snprintf(thname, sizeof(thname), "YabauseSoundCh%d", buffer_desc->channel);
SceUID handle = sys_start_thread(thname, playback_thread,
THREADPRI_SOUND, 0x1000,
sizeof(buffer_desc), &buffer_desc);
if (handle < 0) {
DMSG("Failed to create thread: %s", psp_strerror(handle));
sceAudioChRelease(buffer_desc->channel);
return 0;
}
buffer_desc->thread = handle;
/* Success */
buffer_desc->started = 1;
return 1;
}
/**
* display_end_frame: End processing for the current frame, then swap the
* displayed buffer and work buffer. The current frame will not actually
* be shown until the next vertical blank.
*
* [Parameters]
* None
* [Return value]
* None
*/
void display_end_frame(void)
{
guFinish();
swap_pending = 1;
/* Give the new thread a slightly higher priority than us, or else it
* won't actually get a chance to run. */
if (sys_start_thread("YabauseBufferSwapThread", buffer_swap_thread,
sceKernelGetThreadCurrentPriority() - 1,
0x1000, 0, NULL) < 0) {
DMSG("Failed to start buffer swap thread");
swap_pending = 0;
do_buffer_swap(); // Do it ourselves
}
}
