audsrv.c

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/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright 2005, ps2dev - http://www.ps2dev.org
# Licenced under GNU Library General Public License version 2
*/
 
#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"
 
#define MODNAME "audsrv"
#define VERSION "0.93"
IRX_ID(MODNAME, 1, 4);
 
/* globals */
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;
 
/* status */
static int initialized = 0;
static int playing = 0;
 
 
/* ring buffer properties */
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 u8 core1_buf[0x1000] __attribute__((aligned (16)));
 
static short rendered_left [ 512 ];
static short rendered_right[ 512 ];
 
extern struct irx_export_table _exp_audsrv;
 
/* forward declarations */
static void play_thread(void *arg);
 
static int transfer_complete(void *arg)
{
    (void)arg;
 
    iSignalSema(transfer_sema);
    return 1;
}
 
static void update_volume()
{
    int vol;
 
    /* external input */
    sceSdSetParam(SD_CORE_1 | SD_PARAM_AVOLL, 0x7fff);
    sceSdSetParam(SD_CORE_1 | SD_PARAM_AVOLR, 0x7fff);
 
    /* core0 input */
    sceSdSetParam(SD_CORE_0 | SD_PARAM_BVOLL, 0);
    sceSdSetParam(SD_CORE_0 | SD_PARAM_BVOLR, 0);
 
    /* core1 input */
    vol = playing ? core1_volume : 0;
    sceSdSetParam(SD_CORE_1 | SD_PARAM_BVOLL, vol);
    sceSdSetParam(SD_CORE_1 | SD_PARAM_BVOLR, vol);
 
    /* set master volume for core 0 */
    sceSdSetParam(SD_CORE_0 | SD_PARAM_MVOLL, 0);
    sceSdSetParam(SD_CORE_0 | SD_PARAM_MVOLR, 0);
 
    /* set master volume for core 1 */
    sceSdSetParam(SD_CORE_1 | SD_PARAM_MVOLL, MAX_VOLUME);
    sceSdSetParam(SD_CORE_1 | SD_PARAM_MVOLR, MAX_VOLUME);
}
 
int audsrv_stop_audio()
{
    /* audio is still playing, just mute */
    playing = 0;
    update_volume();
    fillbuf_threshold = 0;
 
    return AUDSRV_ERR_NOERROR;
}
 
int audsrv_format_ok(int freq, int bits, int channels)
{
    if (find_upsampler(freq, bits, channels) != NULL)
    {
        return 1;
    }
 
    /* unsupported format */
    return 0;
}
 
int audsrv_set_format(int freq, int bits, int channels)
{
    int feed_size;
 
    if (audsrv_format_ok(freq, bits, channels) == 0)
    {
        return -AUDSRV_ERR_FORMAT_NOT_SUPPORTED;
    }
 
    /* update shift-right count */
    core1_sample_shift = 0;
    if (bits == 16)
    {
        core1_sample_shift++;
    }
 
    if (channels == 2)
    {
        core1_sample_shift++;
    }
 
    core1_freq = freq;
    core1_bits = bits;
    core1_channels = channels;
 
    /* set ring buffer size to 10 iterations worth of data (~50 ms) */
    feed_size = ((512 * core1_freq) / 48000) << core1_sample_shift;
    ringbuf_size = feed_size * 10;
 
    writepos = 0;
    readpos = (feed_size * 5) & ~3;
 
    DPRINTF("freq %d bits %d channels %d ringbuf_sz %d feed_size %d shift %d\n", freq, bits, channels, ringbuf_size, feed_size, core1_sample_shift);
 
    format_changed = 1;
    return AUDSRV_ERR_NOERROR;
}
 
int audsrv_init()
{
    if (initialized)
    {
        return 0;
    }
 
    /* initialize libsd */
    if (sceSdInit(SD_INIT_COLD) < 0)
    {
        DPRINTF("failed to initialize libsd\n");
        return -1;
    }
 
    readpos = 0;
    writepos = 0;
 
    /* initialize transfer_complete's semaphore */
    transfer_sema = CreateMutex(0);
    if (transfer_sema < 0)
    {
        return AUDSRV_ERR_OUT_OF_MEMORY;
    }
 
    queue_sema = CreateMutex(0);
    if (queue_sema < 0)
    {
        DeleteSema(transfer_sema);
        return AUDSRV_ERR_OUT_OF_MEMORY;
    }
 
    /* audio is always playing in the background. trick is to
     * set the data input volume to zero
     */
    audsrv_stop_audio();
 
    /* initialize transfer-complete callback */
    sceSdSetTransCallback(AUDSRV_BLOCK_DMA_CH, (void *)transfer_complete);
    sceSdBlockTrans(AUDSRV_BLOCK_DMA_CH, SD_TRANS_LOOP, core1_buf, sizeof(core1_buf), 0);
 
    /* default to SPU's native */
    audsrv_set_format(48000, 16, 2);
 
    play_tid = create_thread(play_thread, 39, 0);
    DPRINTF("playing thread 0x%x started\n", play_tid);
 
    DPRINTF("kickstarted\n");
 
    initialized = 1;
    return AUDSRV_ERR_NOERROR;
}
 
int audsrv_available()
{
    if (writepos <= readpos)
    {
        return readpos - writepos;
    }
    else
    {
        return (ringbuf_size - (writepos - readpos));
    }
}
 
int audsrv_queued()
{
    if (writepos < readpos)
    {
        return (ringbuf_size - (readpos - writepos));
    }
    else
    {
        return writepos - readpos;
    }
}
 
int audsrv_wait_audio(int buflen)
{
    if (ringbuf_size < buflen)
    {
        /* this will never happen */
        return AUDSRV_ERR_ARGS;
    }
 
    while (1)
    {
        if (audsrv_available() >= buflen)
        {
            /* enough space! */
            return AUDSRV_ERR_NOERROR;
        }
 
        WaitSema(queue_sema);
    }
}
 
int audsrv_play_audio(const char *buf, int buflen)
{
    int sent = 0;
 
    if (initialized == 0)
    {
        return -AUDSRV_ERR_NOT_INITIALIZED;
    }
 
    if (playing == 0)
    {
        /* audio is always playing, just change the volume */
        playing = 1;
        update_volume();
    }
 
    //DPRINTF("play audio %d bytes, readpos %d, writepos %d avail %d\n", buflen, readpos, writepos, audsrv_available());
 
    /* limit to what's available, no crossing possible */
    buflen = MIN(buflen, audsrv_available());
 
    while (buflen > 0)
    {
        int copy = buflen;
        if (writepos >= readpos)
        {
            copy = MIN(ringbuf_size - writepos, buflen);
        }
 
        memcpy(ringbuf + writepos, buf, copy);
        buf = buf + copy;
        buflen = buflen - copy;
        sent = sent + copy;
 
        writepos = writepos + copy;
        if (writepos >= ringbuf_size)
        {
            /* rewind */
            writepos = 0;
        }
    }
 
    return sent;
}
 
int audsrv_set_volume(int vol)
{
    if (vol < 0 || vol > MAX_VOLUME)
    {
        /* bad joke */
        return AUDSRV_ERR_ARGS;
    }
 
    core1_volume = vol;
    update_volume();
    return AUDSRV_ERR_NOERROR;
}
 
int audsrv_set_threshold(int amount)
{
    if (amount > (ringbuf_size / 2))
    {
        /* amount is greater than what we'd recommend */
        return AUDSRV_ERR_ARGS;
    }
 
    DPRINTF("callback threshold: %d\n", amount);
    fillbuf_threshold = amount;
    return 0;
}
 
static void play_thread(void *arg)
{
    int intr_state;
    int step;
    struct upsample_t up;
    upsampler_t upsampler = NULL;
 
    (void)arg;
 
    DPRINTF("starting play thread\n");
    while (1)
    {
        int block;
        u8 *bufptr;
        int available;
 
        if (format_changed)
        {
            upsampler = find_upsampler(core1_freq, core1_bits, core1_channels);
            format_changed = 0;
        }
 
        if (playing && upsampler != NULL)
        {
            up.src = (const unsigned char *)ringbuf + readpos;
            up.left = rendered_left;
            up.right = rendered_right;
            step = upsampler(&up);
 
            readpos = readpos + step;
            if (readpos >= ringbuf_size)
            {
                /* wrap around */
                readpos = 0;
            }
        }
        else
        {
            /* not playing */
            memset(rendered_left, '\0', sizeof(rendered_left));
            memset(rendered_right, '\0', sizeof(rendered_right));
        }
 
        /* wait until it's safe to transmit another block */
        WaitSema(transfer_sema);
 
        /* suspend all interrupts */
        CpuSuspendIntr(&intr_state);
 
        /* one block is playing currently, other is idle */
        block = 1 - (sceSdBlockTransStatus(AUDSRV_BLOCK_DMA_CH, 0) >> 24);
 
        /* copy 1024 bytes from left and right buffers, into core1_buf */
        bufptr = core1_buf + (block << 11);
        wmemcpy(bufptr +    0, rendered_left + 0, 512);
        wmemcpy(bufptr +  512, rendered_right + 0, 512);
        wmemcpy(bufptr + 1024, rendered_left + 256, 512);
        wmemcpy(bufptr + 1536, rendered_right + 256, 512);
 
        CpuResumeIntr(intr_state);
 
        available = audsrv_available();
        if (available >= (ringbuf_size / 10))
        {
            /* arbitrarily selected ringbuf_size / 10, to reduce
             * number of semaphores signalled.
             */
            SignalSema(queue_sema);
        }
 
        if (fillbuf_threshold > 0 && available >= fillbuf_threshold)
        {
            /* EE client requested a callback */
            call_client_callback(AUDSRV_FILLBUF_CALLBACK);
        }
 
        //DPRINTF("avaiable: %d, queued: %d\n", available, ringbuf_size - available);
    }
}
 
int audsrv_quit()
{
    /* silence! */
    audsrv_stop_audio();
    audsrv_stop_cd();
    audsrv_adpcm_init();
 
    /* stop transmission */
    sceSdSetTransCallback(AUDSRV_BLOCK_DMA_CH, NULL);
    sceSdBlockTrans(AUDSRV_BLOCK_DMA_CH, SD_TRANS_STOP, 0, 0, 0);
 
    /* stop playing thread */
    if (play_tid > 0)
    {
        TerminateThread(play_tid);
        DeleteThread(play_tid);
        play_tid = 0;
    }
 
#ifndef NO_RPC_THREAD
    /* Deinitialize RPC client, only once the playback thread is stopped. */
    deinitialize_rpc_client();
#endif
 
    if (transfer_sema > 0)
    {
        DeleteSema(transfer_sema);
        transfer_sema = 0;
    }
 
    if (queue_sema > 0)
    {
        DeleteSema(queue_sema);
        queue_sema = 0;
    }
 
    return 0;
}
 
int _start(int argc, char *argv[])
{
    int err;
 
    (void)argc;
    (void)argv;
 
    FlushDcache();
    CpuEnableIntr();
 
    printf("greetings from version " VERSION " !\n");
 
    err = RegisterLibraryEntries(&_exp_audsrv);
    if (err != 0)
    {
        DPRINTF("couldn't register library entries. Error %d\n", err);
        return MODULE_NO_RESIDENT_END;
    }
 
    audsrv_adpcm_init();
 
    /* create RPC listener thread */
    initialize_rpc_thread();
 
    return MODULE_RESIDENT_END;
}