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rockbox/apps/codecs/spc.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007-2008 Michael Sevakis (jhMikeS)
* Copyright (C) 2006-2007 Adam Gashlin (hcs)
* Copyright (C) 2004-2007 Shay Green (blargg)
* Copyright (C) 2002 Brad Martin
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/* lovingly ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
/* DSP Based on Brad Martin's OpenSPC DSP emulator */
/* tag reading from sexyspc by John Brawn (John_Brawn@yahoo.com) and others */
#include "codeclib.h"
#include "libspc/spc_codec.h"
#include "libspc/spc_profiler.h"
CODEC_HEADER
/**************** ID666 parsing ****************/
struct {
unsigned char isBinary;
char song[32];
char game[32];
char dumper[16];
char comments[32];
int day,month,year;
unsigned long length;
unsigned long fade;
char artist[32];
unsigned char muted;
unsigned char emulator;
} ID666;
static int LoadID666(unsigned char *buf) {
unsigned char *ib=buf;
int isbinary = 1;
int i;
memcpy(ID666.song,ib,32);
ID666.song[31]=0;
ib+=32;
memcpy(ID666.game,ib,32);
ID666.game[31]=0;
ib+=32;
memcpy(ID666.dumper,ib,16);
ID666.dumper[15]=0;
ib+=16;
memcpy(ID666.comments,ib,32);
ID666.comments[31]=0;
ib+=32;
/* Ok, now comes the fun part. */
/* Date check */
if(ib[2] == '/' && ib[5] == '/' )
isbinary = 0;
/* Reserved bytes check */
if(ib[0xD2 - 0x2E - 112] >= '0' &&
ib[0xD2 - 0x2E - 112] <= '9' &&
ib[0xD3 - 0x2E - 112] == 0x00)
isbinary = 0;
/* is length & fade only digits? */
for (i=0;i<8 && (
(ib[0xA9 - 0x2E - 112+i]>='0'&&ib[0xA9 - 0x2E - 112+i]<='9') ||
ib[0xA9 - 0x2E - 112+i]=='\0');
i++);
if (i==8) isbinary=0;
ID666.isBinary = isbinary;
if(isbinary) {
DEBUGF("binary tag detected\n");
ID666.year=*ib;
ib++;
ID666.year|=*ib<<8;
ib++;
ID666.month=*ib;
ib++;
ID666.day=*ib;
ib++;
ib+=7;
ID666.length=*ib;
ib++;
ID666.length|=*ib<<8;
ib++;
ID666.length|=*ib<<16;
ID666.length*=1000;
ib++;
ID666.fade=*ib;
ib++;
ID666.fade|=*ib<<8;
ib++;
ID666.fade|=*ib<<16;
ib++;
ID666.fade|=*ib<<24;
ib++;
memcpy(ID666.artist,ib,32);
ID666.artist[31]=0;
ib+=32;
ID666.muted=*ib;
ib++;
ID666.emulator=*ib;
ib++;
} else {
unsigned long tmp;
char buf[64];
DEBUGF("text tag detected\n");
memcpy(buf, ib, 2);
buf[2] = 0;
tmp = 0;
for (i=0;i<2 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
ID666.month = tmp;
ib+=3;
memcpy(buf, ib, 2);
buf[2] = 0;
tmp = 0;
for (i=0;i<2 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
ID666.day = tmp;
ib+=3;
memcpy(buf, ib, 4);
buf[4] = 0;
tmp = 0;
for (i=0;i<4 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
ID666.year = tmp;
ib+=5;
memcpy(buf, ib, 3);
buf[3] = 0;
tmp = 0;
for (i=0;i<3 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
ID666.length = tmp * 1000;
ib+=3;
memcpy(buf, ib, 5);
buf[5] = 0;
tmp = 0;
for (i=0;i<5 && buf[i]>='0' && buf[i]<='9';i++) tmp=tmp*10+buf[i]-'0';
ID666.fade = tmp;
ib+=5;
memcpy(ID666.artist,ib,32);
ID666.artist[31]=0;
ib+=32;
/*I have no idea if this is right or not.*/
ID666.muted=*ib;
ib++;
memcpy(buf, ib, 1);
buf[1] = 0;
tmp = 0;
ib++;
}
return 1;
}
/**************** Codec ****************/
enum {SAMPLE_RATE = 32000};
static struct Spc_Emu spc_emu IDATA_ATTR CACHEALIGN_ATTR;
#if SPC_DUAL_CORE
/** Implementations for pipelined dual-core operation **/
static int spc_emu_thread_stack[DEFAULT_STACK_SIZE/sizeof(int)]
CACHEALIGN_ATTR;
static const unsigned char * const spc_emu_thread_name = "spc emu";
static unsigned int emu_thread_id = 0;
enum
{
SPC_EMU_AUDIO = 0,
SPC_EMU_LOAD,
SPC_EMU_QUIT,
};
struct spc_load
{
uint8_t *buf;
size_t size;
};
/* sample queue */
#define WAV_NUM_CHUNKS 2
#define WAV_CHUNK_MASK (WAV_NUM_CHUNKS-1)
struct sample_queue_chunk
{
long id;
union
{
intptr_t data;
int32_t audio[WAV_CHUNK_SIZE*2];
};
};
static struct
{
int head, tail;
struct semaphore emu_sem_head;
struct semaphore emu_sem_tail;
struct semaphore emu_evt_reply;
intptr_t retval;
struct sample_queue_chunk wav_chunk[WAV_NUM_CHUNKS];
} sample_queue SHAREDBSS_ATTR;
static inline void samples_release_wrbuf(void)
{
sample_queue.tail++;
ci->semaphore_release(&sample_queue.emu_sem_head);
}
static inline struct sample_queue_chunk * samples_get_wrbuf(void)
{
ci->semaphore_wait(&sample_queue.emu_sem_tail);
return &sample_queue.wav_chunk[sample_queue.tail & WAV_CHUNK_MASK];
}
static inline void samples_release_rdbuf(void)
{
if (sample_queue.head != sample_queue.tail) {
sample_queue.head++;
}
ci->semaphore_release(&sample_queue.emu_sem_tail);
}
static inline int32_t * samples_get_rdbuf(void)
{
ci->semaphore_wait(&sample_queue.emu_sem_head);
if (ci->stop_codec || ci->new_track)
{
/* Told to stop. Buffer must be released. */
samples_release_rdbuf();
return NULL;
}
return sample_queue.wav_chunk[sample_queue.head & WAV_CHUNK_MASK].audio;
}
static intptr_t emu_thread_send_msg(long id, intptr_t data)
{
struct sample_queue_chunk *chunk;
/* Grab an audio output buffer */
ci->semaphore_wait(&sample_queue.emu_sem_head);
chunk = &sample_queue.wav_chunk[sample_queue.head & WAV_CHUNK_MASK];
/* Place a message in it instead of audio */
chunk->id = id;
chunk->data = data;
/* Release it to the emu thread */
samples_release_rdbuf();
if (id != SPC_EMU_QUIT) {
/* Wait for a response */
ci->semaphore_wait(&sample_queue.emu_evt_reply);
}
return sample_queue.retval;
}
/* thread function */
static bool emu_thread_process_msg(struct sample_queue_chunk *chunk)
{
long id = chunk->id;
bool ret = id != SPC_EMU_QUIT;
chunk->id = SPC_EMU_AUDIO; /* Reset chunk type to audio */
sample_queue.retval = 0;
if (id == SPC_EMU_LOAD)
{
struct spc_load *ld = (struct spc_load *)chunk->data;
invalidate_icache();
SPC_Init(&spc_emu);
sample_queue.retval = SPC_load_spc(&spc_emu, ld->buf, ld->size);
/* Empty the audio queue */
/* This is a dirty hack a timeout based wait would make unnescessary but
still safe because the other thread is known to be waiting for a reply
and is not using the objects. */
ci->semaphore_init(&sample_queue.emu_sem_tail, 2, 2);
ci->semaphore_init(&sample_queue.emu_sem_head, 2, 0);
sample_queue.head = sample_queue.tail = 0;
}
if (id != SPC_EMU_QUIT) {
ci->semaphore_release(&sample_queue.emu_evt_reply);
}
return ret;
}
static void spc_emu_thread(void)
{
CPU_Init(&spc_emu);
while (1) {
/* get a buffer for output */
struct sample_queue_chunk *chunk = samples_get_wrbuf();
if (chunk->id != SPC_EMU_AUDIO) {
/* This chunk doesn't contain audio but a command */
if (!emu_thread_process_msg(chunk))
break;
/* Have to re-get this pointer to keep semaphore counts correct */
continue;
}
ENTER_TIMER(render);
/* fill samples buffer */
if ( SPC_play(&spc_emu, WAV_CHUNK_SIZE*2, chunk->audio) )
assert( false );
EXIT_TIMER(render);
/* done so release it to output */
samples_release_wrbuf();
ci->yield();
}
}
static bool spc_emu_start(void)
{
emu_thread_id = ci->create_thread(spc_emu_thread, spc_emu_thread_stack,
sizeof(spc_emu_thread_stack), CREATE_THREAD_FROZEN,
spc_emu_thread_name IF_PRIO(, PRIORITY_PLAYBACK), COP);
if (emu_thread_id == 0)
return false;
/* Initialize audio queue as full to prevent emu thread from trying to run the
emulator before loading something */
ci->semaphore_init(&sample_queue.emu_evt_reply, 1, 0);
ci->semaphore_init(&sample_queue.emu_sem_tail, 2, 0);
ci->semaphore_init(&sample_queue.emu_sem_head, 2, 2);
sample_queue.head = 0;
sample_queue.tail = 2;
/* Start it running */
ci->thread_thaw(emu_thread_id);
return true;
}
/* load a new program on the emu thread */
static inline int load_spc_buffer(uint8_t *buf, size_t size)
{
struct spc_load ld = { buf, size };
flush_icache();
return emu_thread_send_msg(SPC_EMU_LOAD, (intptr_t)&ld);
}
static inline void spc_emu_quit(void)
{
if (emu_thread_id != 0) {
emu_thread_send_msg(SPC_EMU_QUIT, 0);
/* Wait for emu thread to be killed */
ci->thread_wait(emu_thread_id);
invalidate_icache();
}
}
static inline bool spc_play_get_samples(int32_t **samples)
{
/* obtain filled samples buffer */
*samples = samples_get_rdbuf();
return *samples != NULL;
}
static inline void spc_play_send_samples(int32_t *samples)
{
ci->pcmbuf_insert(samples, samples+WAV_CHUNK_SIZE, WAV_CHUNK_SIZE);
/* done with chunk so release it to emu thread */
samples_release_rdbuf();
}
#else /* !SPC_DUAL_CORE */
/** Implementations for single-core operation **/
int32_t wav_chunk[WAV_CHUNK_SIZE*2] IBSS_ATTR;
/* load a new program into emu */
static inline int load_spc_buffer(uint8_t *buf, size_t size)
{
SPC_Init(&spc_emu);
return SPC_load_spc(&spc_emu, buf, size);
}
static inline bool spc_emu_start(void)
{
#ifdef CPU_COLDFIRE
/* signed integer mode with saturation */
coldfire_set_macsr(EMAC_SATURATE);
#endif
CPU_Init(&spc_emu);
return true;
}
static inline void spc_play_send_samples(int32_t *samples)
{
ci->pcmbuf_insert(samples, samples+WAV_CHUNK_SIZE, WAV_CHUNK_SIZE);
}
#define spc_emu_quit()
#define samples_release_rdbuf()
static inline bool spc_play_get_samples(int32_t **samples)
{
ENTER_TIMER(render);
/* fill samples buffer */
if ( SPC_play(&spc_emu,WAV_CHUNK_SIZE*2,wav_chunk) )
assert( false );
EXIT_TIMER(render);
*samples = wav_chunk;
return true;
}
#endif /* SPC_DUAL_CORE */
/* The main decoder loop */
static int play_track( void )
{
int sampleswritten=0;
unsigned long fadestartsample = ID666.length*(long long) SAMPLE_RATE/1000;
unsigned long fadeendsample = (ID666.length+ID666.fade)*(long long) SAMPLE_RATE/1000;
int fadedec = 0;
int fadevol = 0x7fffffffl;
if (fadeendsample>fadestartsample)
fadedec=0x7fffffffl/(fadeendsample-fadestartsample)+1;
ENTER_TIMER(total);
while ( 1 )
{
ci->yield();
if (ci->stop_codec || ci->new_track) {
break;
}
if (ci->seek_time) {
int curtime = sampleswritten*1000LL/SAMPLE_RATE;
DEBUGF("seek to %ld\ncurrently at %d\n",ci->seek_time,curtime);
if (ci->seek_time < curtime) {
DEBUGF("seek backwards = reset\n");
ci->seek_complete();
return 1;
}
ci->seek_complete();
}
int32_t *samples;
if (!spc_play_get_samples(&samples))
break;
sampleswritten += WAV_CHUNK_SIZE;
/* is track timed? */
if (ci->global_settings->repeat_mode!=REPEAT_ONE && ci->id3->length) {
unsigned long curtime = sampleswritten*1000LL/SAMPLE_RATE;
unsigned long lasttimesample = (sampleswritten-WAV_CHUNK_SIZE);
/* fade? */
if (curtime>ID666.length)
{
#ifdef CPU_COLDFIRE
/* Have to switch modes to do this */
long macsr = coldfire_get_macsr();
coldfire_set_macsr(EMAC_SATURATE | EMAC_FRACTIONAL | EMAC_ROUND);
#endif
int i;
for (i=0;i<WAV_CHUNK_SIZE;i++) {
if (lasttimesample+i>fadestartsample) {
if (fadevol>0) {
samples[i] = FRACMUL(samples[i], fadevol);
samples[i+WAV_CHUNK_SIZE] = FRACMUL(samples[i+WAV_CHUNK_SIZE], fadevol);
} else samples[i]=samples[i+WAV_CHUNK_SIZE]=0;
fadevol-=fadedec;
}
}
#ifdef CPU_COLDFIRE
coldfire_set_macsr(macsr);
#endif
}
/* end? */
if (lasttimesample>=fadeendsample)
{
samples_release_rdbuf();
break;
}
}
spc_play_send_samples(samples);
if (ci->global_settings->repeat_mode!=REPEAT_ONE)
ci->set_elapsed(sampleswritten*1000LL/SAMPLE_RATE);
else
ci->set_elapsed(0);
}
EXIT_TIMER(total);
return 0;
}
/* this is the codec entry point */
enum codec_status codec_main(void)
{
enum codec_status stat = CODEC_ERROR;
if (!spc_emu_start())
goto codec_quit;
do
{
DEBUGF("SPC: next_track\n");
if (codec_init()) {
goto codec_quit;
}
DEBUGF("SPC: after init\n");
ci->configure(DSP_SET_SAMPLE_DEPTH, 24);
ci->configure(DSP_SET_FREQUENCY, SAMPLE_RATE);
ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
/* wait for track info to load */
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->yield();
codec_set_replaygain(ci->id3);
/* Read the entire file */
DEBUGF("SPC: request initial buffer\n");
ci->configure(CODEC_SET_FILEBUF_WATERMARK, ci->filesize);
ci->seek_buffer(0);
size_t buffersize;
uint8_t* buffer = ci->request_buffer(&buffersize, ci->filesize);
if (!buffer) {
goto codec_quit;
}
DEBUGF("SPC: read size = 0x%lx\n",(unsigned long)buffersize);
do
{
if (load_spc_buffer(buffer, buffersize)) {
DEBUGF("SPC load failure\n");
goto codec_quit;
}
LoadID666(buffer+0x2e);
if (ci->global_settings->repeat_mode!=REPEAT_ONE && ID666.length==0) {
ID666.length=3*60*1000; /* 3 minutes */
ID666.fade=5*1000; /* 5 seconds */
}
reset_profile_timers();
}
while ( play_track() );
print_timers(ci->id3->path);
}
while ( ci->request_next_track() );
stat = CODEC_OK;
codec_quit:
spc_emu_quit();
return stat;
}
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