#include <stdio.h>
#include <thbase.h>
#include <thsemap.h>
#include <loadcore.h>
#include <sysmem.h>
#include <intrman.h>
#include <sifcmd.h>
#include <libsd.h>
#include <sysclib.h>
#include <audsrv.h>
#include "audsrv_internal.h"
#include "common.h"
#include "rpc_server.h"
#include "rpc_client.h"
#include "upsamplers.h"
#include "hw.h"
#include "spu.h"
#include "debug_printf.h"

Include dependency graph for audsrv.c:

Macros
#define	MODNAME "audsrv"

#define	VERSION "0.93"

Functions
	IRX_ID (MODNAME, 1, 4)

static u8 core1_buf[0x1000]	__attribute__ ((aligned(16)))

static void	play_thread (void *arg)

static int	transfer_complete (void *arg)

static void	update_volume ()

int	audsrv_stop_audio ()

int	audsrv_format_ok (int freq, int bits, int channels)

int	audsrv_set_format (int freq, int bits, int channels)

int	audsrv_init ()

int	audsrv_available ()

int	audsrv_queued ()

int	audsrv_wait_audio (int buflen)

int	audsrv_play_audio (const char *buf, int buflen)

int	audsrv_set_volume (int vol)

int	audsrv_set_threshold (int amount)

int	audsrv_quit ()

int	_start (int argc, char *argv[])

Variables
static int	core1_volume = MAX_VOLUME

static int	core1_freq = 0

static int	core1_bits = 0

static int	core1_channels = 0

static int	core1_sample_shift = 0

static int	initialized = 0

static int	playing = 0

static char	ringbuf [20480]

static int	ringbuf_size = sizeof(ringbuf)

static int	readpos

static int	writepos

static int	play_tid = 0

static int	queue_sema = 0

static int	transfer_sema = 0

static int	fillbuf_threshold = 0

static int	format_changed = 0

static short	rendered_left [512]

static short	rendered_right [512]

struct irx_export_table	_exp_audsrv

Detailed Description

audsrv IOP server

Definition in file audsrv.c.

Function Documentation

◆ attribute()

static u8 core1_buf [0x1000] __attribute__ ( (aligned(16)) )

static

double buffer for streaming

SOURCE CHAIN TAG for DMA CHAIN MODE

Definition at line 19 of file netcnfif.c.

◆ play_thread()

static void play_thread ( void * arg )

static

Main playing thread

Parameters

arg not used

This is the main playing thread. It feeds the SPU with upsampled, demux'd audio data, from what has been queued beforehand. The stream is constructed as a ring buffer. This thread only ends with TerminateThread, and is usually asleep, waiting for SPU to complete playing the current wave. SPU plays 2048 bytes blocks, which yields that this thread wakes and sleeps 93.75 times a second

Definition at line 429 of file audsrv.c.

◆ transfer_complete()

static int transfer_complete ( void * arg )

static

Transfer complete callback.

Parameters

arg not used

Returns: true, always

Generated by SPU2, when a block was transmitted and now putting to upload a second block to the other buffer.

Definition at line 99 of file audsrv.c.

◆ update_volume()

static void update_volume ( )

static

Apply volume changes, or keep mute if not playing

Definition at line 108 of file audsrv.c.

Referenced by audsrv_stop_audio().

◆ audsrv_stop_audio()

int audsrv_stop_audio ( )

Stops all audio playing

Returns: 0, always

Mutes output and stops accepting audio blocks; also, clears callbacks.

Definition at line 139 of file audsrv.c.

References AUDSRV_ERR_NOERROR, call_rpc_1(), fillbuf_threshold, playing, and update_volume().

Referenced by audsrv_quit().

◆ audsrv_format_ok()

int audsrv_format_ok	(	int	freq,
		int	bits,
		int	channels
	)

Checks if the format noted by frequency and depth is supported

Parameters

freq	frequency in hz
bits	bits per sample (8, 16)
channels	channels

Returns: positive on success, zero value on failure

Definition at line 156 of file audsrv.c.

References find_upsampler().

Referenced by audsrv_set_format().

◆ audsrv_set_format()

int audsrv_set_format	(	int	freq,
		int	bits,
		int	channels
	)

Configures audio stream

Parameters

freq	frequency in hz
bits	bits per sample (8, 16)
channels	number of channels

Returns: 0 on success, negative if configuration is not supported

This sets up audsrv to accept stream in this format and convert it to SPU2's native format if required. Note: it is possible to change the format at any point. You might want to stop audio prior to that, to prevent mismatched audio output.

Definition at line 178 of file audsrv.c.

References audsrv_format_ok().

◆ audsrv_init()

int audsrv_init ( )

Initializes audsrv library

Returns: 0 on success

Definition at line 219 of file audsrv.c.

References initialized.

◆ audsrv_available()

int audsrv_available ( )

Returns the number of bytes that can be queued

Returns: byte count

Returns the number of bytes that are available in the ring buffer. This is the total bytes that can be queued, without collision of the reading head with the writing head.

Definition at line 278 of file audsrv.c.

References call_rpc_1(), readpos, ringbuf_size, and writepos.

◆ audsrv_queued()

int audsrv_queued ( )

Returns the number of bytes already in queue

Returns: byte count

Returns the number of bytes that are already in the ring buffer.

Definition at line 295 of file audsrv.c.

References call_rpc_1(), readpos, ringbuf_size, and writepos.

◆ audsrv_wait_audio()

int audsrv_wait_audio ( int buflen )

Blocks until there is enough space to enqueue chunk

Parameters

buflen size of chunk requested to be enqueued (in bytes)

Returns: error status code

Blocks until there are enough space to store the upcoming chunk in audsrv's internal ring buffer.

Definition at line 314 of file audsrv.c.

References call_rpc_1(), and ringbuf_size.

◆ audsrv_play_audio()

int audsrv_play_audio	(	const char *	buf,
		int	buflen
	)

Uploads audio buffer to SPU

Parameters

buf	audio chunk
buflen	size of chunk in bytes

Returns: positive number of bytes sent to processor or negative error status

Plays an audio buffer; It will not interrupt a playing buffer, rather queue it up and play it as soon as possible without interfering with fluent streaming. The buffer and buflen are given in host format (i.e, 11025hz 8bit stereo.)

Definition at line 344 of file audsrv.c.

References AUDSRV_ERR_NOERROR, and set_error().

◆ audsrv_set_volume()

int audsrv_set_volume ( int vol )

Sets output volume

Parameters

vol	volume in SPU2 units [0 .. 0x3fff]

Returns: 0 on success, negative otherwise

Definition at line 393 of file audsrv.c.

References call_rpc_1(), MAX_VOLUME, and MIN_VOLUME.

◆ audsrv_quit()

int audsrv_quit ( )

Shutdowns audsrv

Returns: AUDSRV_ERR_NOERROR

Definition at line 512 of file audsrv.c.

References audsrv_adpcm_init(), audsrv_stop_audio(), and audsrv_stop_cd().

◆ _start()

int _start	(	int	argc,
		char *	argv[]
	)

IRX _start function

Returns: zero on success

Initializes interrupts and the RPC thread. Oh, and greets the user.

Definition at line 556 of file audsrv.c.

Variable Documentation

◆ core1_volume

int core1_volume = MAX_VOLUME

static

core1 (sfx) volume

Definition at line 41 of file audsrv.c.

◆ core1_freq

int core1_freq = 0

static

frequency set by user

Definition at line 43 of file audsrv.c.

◆ core1_bits

int core1_bits = 0

static

bits per sample, set by user

Definition at line 45 of file audsrv.c.

◆ core1_channels

int core1_channels = 0

static

number of audio channels

Definition at line 47 of file audsrv.c.

◆ core1_sample_shift

int core1_sample_shift = 0

static

shift count from bytes to samples

Definition at line 49 of file audsrv.c.

◆ initialized

int initialized = 0

static

initialization status

Definition at line 53 of file audsrv.c.

Referenced by audsrv_init().

◆ playing

int playing = 0

static

playing (not mute) status

Definition at line 55 of file audsrv.c.

Referenced by audsrv_stop_audio().

◆ ringbuf

char ringbuf[20480]

static

ring buffer itself

Definition at line 60 of file audsrv.c.

◆ ringbuf_size

int ringbuf_size = sizeof(ringbuf)

static

size of ring buffer in bytes

Definition at line 62 of file audsrv.c.

Referenced by audsrv_available(), audsrv_queued(), and audsrv_wait_audio().

◆ readpos

int readpos

static

reading head pointer

Definition at line 64 of file audsrv.c.

Referenced by audsrv_available(), and audsrv_queued().

◆ writepos

int writepos

static

writing head pointer

Definition at line 66 of file audsrv.c.

Referenced by audsrv_available(), and audsrv_queued().

◆ play_tid

int play_tid = 0

static

playing thread id

Definition at line 69 of file audsrv.c.

◆ queue_sema

int queue_sema = 0

static

semaphore for wait_audio()

Definition at line 71 of file audsrv.c.

◆ transfer_sema

int transfer_sema = 0

static

SPU2 transfer complete semaphore

Definition at line 73 of file audsrv.c.

◆ fillbuf_threshold

int fillbuf_threshold = 0

static

threshold to initiate a callback

Definition at line 75 of file audsrv.c.

Referenced by audsrv_stop_audio().

◆ format_changed

int format_changed = 0

static

boolean to notify when format has changed

Definition at line 78 of file audsrv.c.

◆ _exp_audsrv

struct irx_export_table _exp_audsrv

exports table

Macros

Functions

Variables

Detailed Description

Function Documentation

◆ __attribute__()

◆ play_thread()

◆ transfer_complete()

◆ update_volume()

◆ audsrv_stop_audio()

◆ audsrv_format_ok()

◆ audsrv_set_format()

◆ audsrv_init()

◆ audsrv_available()

◆ audsrv_queued()

◆ audsrv_wait_audio()

◆ audsrv_play_audio()

◆ audsrv_set_volume()

◆ audsrv_quit()

◆ _start()

Variable Documentation

◆ core1_volume

◆ core1_freq

◆ core1_bits

◆ core1_channels

◆ core1_sample_shift

◆ initialized

◆ playing

◆ ringbuf

◆ ringbuf_size

◆ readpos

◆ writepos

◆ play_tid

◆ queue_sema

◆ transfer_sema

◆ fillbuf_threshold

◆ format_changed

◆ _exp_audsrv

◆ attribute()