[picodrive.git] / platform / psp / mp3.c

// (c) Copyright 2007 notaz, All rights reserved.
// Free for non-commercial use.

// For commercial use, separate licencing terms must be obtained.

#include <stdio.h>
#include <string.h>

#include <pspkernel.h>
#include <pspsdk.h>
#include <pspaudiocodec.h>
#include <kubridge.h>

#include "../../Pico/PicoInt.h"
#include "../../Pico/sound/mix.h"
#include "../common/lprintf.h"

int mp3_last_error = 0;

static int initialized = 0;
static SceUID thread_job_sem = -1;
static SceUID thread_busy_sem = -1;
static int thread_exit = 0;

// MPEG-1, layer 3
static int bitrates[] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 };
//static int samplerates[] = { 44100, 48000, 32000, 0 };

#define MIN_INFRAME_SIZE 96
#define IN_BUFFER_SIZE (2*1024)

static unsigned long mp3_codec_struct[65] __attribute__((aligned(64)));

static unsigned char mp3_src_buffer[2][IN_BUFFER_SIZE] __attribute__((aligned(64)));
static short mp3_mix_buffer[2][1152*2] __attribute__((aligned(64)));
static int working_buf = 0;

static const char *mp3_fname = NULL;
static SceUID mp3_handle = -1;
static int mp3_src_pos = 0, mp3_src_size = 0;

static int decode_thread(SceSize args, void *argp);


static void psp_sem_lock(SceUID sem)
{
	int ret = sceKernelWaitSema(sem, 1, 0);
	if (ret < 0) lprintf("sceKernelWaitSema(%08x) failed with %08x\n", sem, ret);
}

static void psp_sem_unlock(SceUID sem)
{
	int ret = sceKernelSignalSema(sem, 1);
	if (ret < 0) lprintf("sceKernelSignalSema(%08x) failed with %08x\n", sem, ret);
}

// only accepts MPEG-1, layer3
static int find_sync_word(unsigned char *data, int len)
{
	int i;
	for (i = 0; i < len-1; i++)
	{
		if ( data[i+0] != 0xff) continue;
		if ((data[i+1] & 0xfe) == 0xfa) return i;
		i++;
	}
	return -1;
}

static int read_next_frame(int which_buffer)
{
	int i, bytes_read, frame_offset;
	int bitrate, padding, frame_size = 0;

	for (i = 0; i < 32; i++)
	{
		bytes_read = sceIoRead(mp3_handle, mp3_src_buffer[which_buffer], sizeof(mp3_src_buffer[which_buffer]));
		mp3_src_pos += bytes_read;
		if (bytes_read < MIN_INFRAME_SIZE) {
			mp3_src_pos = mp3_src_size;
			return 0; // EOF/IO failure
		}
		frame_offset = find_sync_word(mp3_src_buffer[which_buffer], bytes_read);
		if (frame_offset < 0) {
			lprintf("missing syncword, foffs=%i\n", mp3_src_pos - bytes_read);
			mp3_src_pos--;
			sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
			continue;
		}
		if (bytes_read - frame_offset < 4) {
			lprintf("syncword @ EOB, foffs=%i\n", mp3_src_pos - bytes_read);
			mp3_src_pos--;
			sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
			continue;
		}

		bitrate =  mp3_src_buffer[which_buffer][frame_offset+2] >> 4;
		padding = (mp3_src_buffer[which_buffer][frame_offset+2] & 2) >> 1;

		frame_size = 144000*bitrates[bitrate]/44100 + padding;
		if (frame_size <= 0) {
			lprintf("bad frame, foffs=%i\n", mp3_src_pos - bytes_read);
			continue; // bad frame
		}

		if (bytes_read - frame_offset < frame_size)
		{
			lprintf("unfit, foffs=%i\n", mp3_src_pos - bytes_read);
			mp3_src_pos -= bytes_read - frame_offset;
			if (mp3_src_size - mp3_src_pos < frame_size) {
				mp3_src_pos = mp3_src_size;
				return 0; // EOF
			}
			sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
			continue; // didn't fit, re-read..
		}

		if (frame_offset) {
			//lprintf("unaligned, foffs=%i, offs=%i\n", mp3_src_pos - bytes_read, frame_offset);
			memmove(mp3_src_buffer[which_buffer], mp3_src_buffer[which_buffer] + frame_offset, frame_size);
		}

		// align for next frame read
		mp3_src_pos -= bytes_read - (frame_offset + frame_size);
		sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);

		break;
	}

	return frame_size > 0 ? frame_size : -1;
}


static SceUID load_start_module(const char *prxname)
{
	SceUID mod, mod1;
	int status, ret;

	mod = pspSdkLoadStartModule(prxname, PSP_MEMORY_PARTITION_KERNEL);
	if (mod < 0) {
		lprintf("failed to load %s (%08x), trying kuKernelLoadModule\n", prxname, mod);
		mod1 = kuKernelLoadModule(prxname, 0, NULL);
		if (mod1 < 0) lprintf("kuKernelLoadModule failed with %08x\n", mod1);
		else {
			ret = sceKernelStartModule(mod1, 0, NULL, &status, 0);
			if (ret < 0) lprintf("sceKernelStartModule failed with %08x\n", ret);
			else mod = mod1;
		}
	}
	return mod;
}


int mp3_init(void)
{
	SceUID thid, mod;
	int ret;

	/* load modules */
	/* <= 1.5 (and probably some other, not sure which) fw need this to for audiocodec to work,
	 * so if it fails, assume we are just on new enough firmware and continue.. */
	load_start_module("flash0:/kd/me_for_vsh.prx");

	if (sceKernelDevkitVersion() < 0x02070010)
	     mod = load_start_module("flash0:/kd/audiocodec.prx");
	else mod = load_start_module("flash0:/kd/avcodec.prx");
	if (mod < 0) {
		ret = mod;
		mod = load_start_module("flash0:/kd/audiocodec_260.prx"); // last chance..
		if (mod < 0) goto fail;
	}

	/* audiocodec init */
	memset(mp3_codec_struct, 0, sizeof(mp3_codec_struct));
	ret = sceAudiocodecCheckNeedMem(mp3_codec_struct, 0x1002);
	if (ret < 0) {
		lprintf("sceAudiocodecCheckNeedMem failed with %08x\n", ret);
		goto fail;
	}

	ret = sceAudiocodecGetEDRAM(mp3_codec_struct, 0x1002);
	if (ret < 0) {
		lprintf("sceAudiocodecGetEDRAM failed with %08x\n", ret);
		goto fail;
	}

	ret = sceAudiocodecInit(mp3_codec_struct, 0x1002);
	if (ret < 0) {
		lprintf("sceAudiocodecInit failed with %08x\n", ret);
		goto fail1;
	}

	/* thread and stuff */
	thread_job_sem = sceKernelCreateSema("p_mp3job_sem", 0, 0, 1, NULL);
	if (thread_job_sem < 0) {
		lprintf("sceKernelCreateSema() failed: %08x\n", thread_job_sem);
		ret = thread_job_sem;
		goto fail1;
	}

	thread_busy_sem = sceKernelCreateSema("p_mp3busy_sem", 0, 1, 1, NULL);
	if (thread_busy_sem < 0) {
		lprintf("sceKernelCreateSema() failed: %08x\n", thread_busy_sem);
		ret = thread_busy_sem;
		goto fail2;
	}

	/* use slightly higher prio then main */
	thread_exit = 0;
	thid = sceKernelCreateThread("mp3decode_thread", decode_thread, 30, 0x2000, 0, NULL);
	if (thid < 0) {
		lprintf("failed to create decode thread: %08x\n", thid);
		ret = thid;
		goto fail3;
	}
	ret = sceKernelStartThread(thid, 0, 0);
	if (ret < 0) {
		lprintf("failed to start decode thread: %08x\n", ret);
		goto fail3;
	}

	mp3_last_error = 0;
	initialized = 1;
	return 0;

fail3:
	sceKernelDeleteSema(thread_busy_sem);
	thread_busy_sem = -1;
fail2:
	sceKernelDeleteSema(thread_job_sem);
	thread_job_sem = -1;
fail1:
	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
fail:
	mp3_last_error = ret;
	initialized = 0;
	return 1;
}

void mp3_deinit(void)
{
	lprintf("mp3_deinit, initialized=%i\n", initialized);

	if (!initialized) return;
	thread_exit = 1;
	psp_sem_lock(thread_busy_sem);
	psp_sem_unlock(thread_busy_sem);

	sceKernelSignalSema(thread_job_sem, 1);
	sceKernelDelayThread(100*1000);

	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	mp3_handle = -1;
	mp3_fname = NULL;

	sceKernelDeleteSema(thread_busy_sem);
	thread_busy_sem = -1;
	sceKernelDeleteSema(thread_job_sem);
	thread_job_sem = -1;
	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
	initialized = 0;
}

// may overflow stack?
static int decode_thread(SceSize args, void *argp)
{
	int ret, frame_size;

	lprintf("decode_thread started with id %08x, priority %i\n",
                sceKernelGetThreadId(), sceKernelGetThreadCurrentPriority());

	while (!thread_exit)
	{
		psp_sem_lock(thread_job_sem);
		if (thread_exit) break;

		psp_sem_lock(thread_busy_sem);
		//lprintf("{ job\n");

		frame_size = read_next_frame(working_buf);
		if (frame_size > 0)
		{
			mp3_codec_struct[6] = (unsigned long)mp3_src_buffer[working_buf];
			mp3_codec_struct[8] = (unsigned long)mp3_mix_buffer[working_buf];
			mp3_codec_struct[7] = mp3_codec_struct[10] = frame_size;
			mp3_codec_struct[9] = 1152 * 4;

			ret = sceAudiocodecDecode(mp3_codec_struct, 0x1002);
			if (ret < 0) lprintf("sceAudiocodecDecode failed with %08x\n", ret);
		}

		//lprintf("} job\n");
		psp_sem_unlock(thread_busy_sem);
	}

	lprintf("leaving decode thread\n");
	sceKernelExitDeleteThread(0);
	return 0;
}


// might be called before initialization
int mp3_get_bitrate(FILE *f, int size)
{
	int ret, retval = -1, sample_rate, bitrate;
	// filenames are stored instead handles in PSP, due to stupid max open file limit
	char *fname = (char *)f;

	/* make sure thread is not busy.. */
	if (thread_busy_sem >= 0)
		psp_sem_lock(thread_busy_sem);

	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	if (mp3_handle < 0) {
		lprintf("sceIoOpen(%s) failed\n", fname);
		goto end;
	}

	mp3_src_pos = 0;
	ret = read_next_frame(0);
	if (ret <= 0) {
		lprintf("read_next_frame() failed (%s)\n", fname);
		goto end;
	}
	sample_rate = (mp3_src_buffer[0][2] & 0x0c) >> 2;
	bitrate = mp3_src_buffer[0][2] >> 4;

	if (sample_rate != 0) {
		lprintf("unsupported samplerate (%s)\n", fname);
		goto end; // only 44kHz supported..
	}
	bitrate = bitrates[bitrate];
	if (bitrate == 0) {
		lprintf("unsupported bitrate (%s)\n", fname);
		goto end;
	}

	/* looking good.. */
	retval = bitrate;
end:
	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	mp3_handle = -1;
	mp3_fname = NULL;
	if (thread_busy_sem >= 0)
		psp_sem_unlock(thread_busy_sem);
	if (retval < 0) mp3_last_error = -1; // remember we had a problem..
	return retval;
}


static int mp3_job_started = 0, mp3_samples_ready = 0, mp3_buffer_offs = 0, mp3_play_bufsel = 0;

void mp3_start_play(FILE *f, int pos)
{
	char *fname = (char *)f;

	if (!initialized) return;

	lprintf("mp3_start_play(%s) @ %i\n", fname, pos);
	psp_sem_lock(thread_busy_sem);

	if (mp3_fname != fname || mp3_handle < 0)
	{
		if (mp3_handle >= 0) sceIoClose(mp3_handle);
		mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
		if (mp3_handle < 0) {
			lprintf("sceIoOpen(%s) failed\n", fname);
			psp_sem_unlock(thread_busy_sem);
			return;
		}
		mp3_src_size = sceIoLseek32(mp3_handle, 0, PSP_SEEK_END);
		mp3_fname = fname;
	}

	// seek..
	mp3_src_pos = (int) (((float)pos / 1023.0f) * (float)mp3_src_size);
	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	lprintf("seek %i: %i/%i\n", pos, mp3_src_pos, mp3_src_size);

	mp3_job_started = 1;
	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;
	working_buf = 0;

	/* send a request to decode first frame */
	psp_sem_unlock(thread_busy_sem);
	psp_sem_unlock(thread_job_sem);
	sceKernelDelayThread(1); // reschedule
}


void mp3_update(int *buffer, int length, int stereo)
{
	int length_mp3;

	// playback was started, track not ended
	if (mp3_handle < 0 || mp3_src_pos >= mp3_src_size) return;

	length_mp3 = length;
	if (PsndRate == 22050) length_mp3 <<= 1;	// mp3s are locked to 44100Hz stereo
	else if (PsndRate == 11025) length_mp3 <<= 2;	// so make length 44100ish

	/* do we have to wait? */
	if (mp3_job_started && mp3_samples_ready < length_mp3)
	{
		psp_sem_lock(thread_busy_sem);
		psp_sem_unlock(thread_busy_sem);
		mp3_job_started = 0;
		mp3_samples_ready += 1152;
	}

	/* mix mp3 data, only stereo */
	if (mp3_samples_ready >= length_mp3)
	{
		int shr = 0;
		void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32;
		if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }
		else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }

		if (1152 - mp3_buffer_offs >= length_mp3) {
			mix_samples(buffer, mp3_mix_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);

			mp3_buffer_offs += length_mp3;
		} else {
			// collect samples from both buffers..
			int left = 1152 - mp3_buffer_offs;
			if (mp3_play_bufsel == 0)
			{
				mix_samples(buffer, mp3_mix_buffer[0] + mp3_buffer_offs*2, length<<1);
				mp3_buffer_offs = length_mp3 - left;
				mp3_play_bufsel = 1;
			} else {
				mix_samples(buffer, mp3_mix_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);
				mp3_buffer_offs = length_mp3 - left;
				mix_samples(buffer + ((left>>shr)<<1),
					mp3_mix_buffer[0], (mp3_buffer_offs>>shr)<<1);
				mp3_play_bufsel = 0;
			}
		}
		mp3_samples_ready -= length_mp3;
	}

	// ask to decode more if we already can
	if (!mp3_job_started)
	{
		mp3_job_started = 1;
		working_buf ^= 1;

		/* next job.. */
		psp_sem_lock(thread_busy_sem);   // just in case
		psp_sem_unlock(thread_busy_sem);
		psp_sem_unlock(thread_job_sem);
		sceKernelDelayThread(1);
	}
}


int mp3_get_offset(void) // 0-1023
{
	unsigned int offs1024 = 0;
	int cdda_on;

	cdda_on = (PicoAHW & PAHW_MCD) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&
			(Pico_mcd->scd.Status_CDC & 1) && mp3_handle >= 0;

	if (cdda_on) {
		offs1024  = mp3_src_pos << 7;
		offs1024 /= mp3_src_size >> 3;
	}
	lprintf("offs1024=%u (%i/%i)\n", offs1024, mp3_src_pos, mp3_src_size);

	return offs1024;
}


void mp3_reopen_file(void)
{
	if (mp3_fname == NULL) return;
	lprintf("mp3_reopen_file(%s)\n", mp3_fname);

	// try closing, just in case
	if (mp3_handle >= 0) sceIoClose(mp3_handle);

	mp3_handle = sceIoOpen(mp3_fname, PSP_O_RDONLY, 0777);
	if (mp3_handle >= 0)
		sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	lprintf("mp3_reopen_file %s\n", mp3_handle >= 0 ? "ok" : "failed");
}
Commit	Line	Data
	1	// (c) Copyright 2007 notaz, All rights reserved.
	2	// Free for non-commercial use.
	3
	4	// For commercial use, separate licencing terms must be obtained.
	5
	6	#include <stdio.h>
	7	#include <string.h>
	8
	9	#include <pspkernel.h>
	10	#include <pspsdk.h>
	11	#include <pspaudiocodec.h>
	12	#include <kubridge.h>
	13
	14	#include "../../Pico/PicoInt.h"
	15	#include "../../Pico/sound/mix.h"
	16	#include "../common/lprintf.h"
	17
	18	int mp3_last_error = 0;
	19
	20	static int initialized = 0;
	21	static SceUID thread_job_sem = -1;
	22	static SceUID thread_busy_sem = -1;
	23	static int thread_exit = 0;
	24
	25	// MPEG-1, layer 3
	26	static int bitrates[] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 };
	27	//static int samplerates[] = { 44100, 48000, 32000, 0 };
	28
	29	#define MIN_INFRAME_SIZE 96
	30	#define IN_BUFFER_SIZE (2*1024)
	31
	32	static unsigned long mp3_codec_struct[65] __attribute__((aligned(64)));
	33
	34	static unsigned char mp3_src_buffer[2][IN_BUFFER_SIZE] __attribute__((aligned(64)));
	35	static short mp3_mix_buffer[2][1152*2] __attribute__((aligned(64)));
	36	static int working_buf = 0;
	37
	38	static const char *mp3_fname = NULL;
	39	static SceUID mp3_handle = -1;
	40	static int mp3_src_pos = 0, mp3_src_size = 0;
	41
	42	static int decode_thread(SceSize args, void *argp);
	43
	44
	45	static void psp_sem_lock(SceUID sem)
	46	{
	47	int ret = sceKernelWaitSema(sem, 1, 0);
	48	if (ret < 0) lprintf("sceKernelWaitSema(%08x) failed with %08x\n", sem, ret);
	49	}
	50
	51	static void psp_sem_unlock(SceUID sem)
	52	{
	53	int ret = sceKernelSignalSema(sem, 1);
	54	if (ret < 0) lprintf("sceKernelSignalSema(%08x) failed with %08x\n", sem, ret);
	55	}
	56
	57	// only accepts MPEG-1, layer3
	58	static int find_sync_word(unsigned char *data, int len)
	59	{
	60	int i;
	61	for (i = 0; i < len-1; i++)
	62	{
	63	if ( data[i+0] != 0xff) continue;
	64	if ((data[i+1] & 0xfe) == 0xfa) return i;
	65	i++;
	66	}
	67	return -1;
	68	}
	69
	70	static int read_next_frame(int which_buffer)
	71	{
	72	int i, bytes_read, frame_offset;
	73	int bitrate, padding, frame_size = 0;
	74
	75	for (i = 0; i < 32; i++)
	76	{
	77	bytes_read = sceIoRead(mp3_handle, mp3_src_buffer[which_buffer], sizeof(mp3_src_buffer[which_buffer]));
	78	mp3_src_pos += bytes_read;
	79	if (bytes_read < MIN_INFRAME_SIZE) {
	80	mp3_src_pos = mp3_src_size;
	81	return 0; // EOF/IO failure
	82	}
	83	frame_offset = find_sync_word(mp3_src_buffer[which_buffer], bytes_read);
	84	if (frame_offset < 0) {
	85	lprintf("missing syncword, foffs=%i\n", mp3_src_pos - bytes_read);
	86	mp3_src_pos--;
	87	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	88	continue;
	89	}
	90	if (bytes_read - frame_offset < 4) {
	91	lprintf("syncword @ EOB, foffs=%i\n", mp3_src_pos - bytes_read);
	92	mp3_src_pos--;
	93	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	94	continue;
	95	}
	96
	97	bitrate = mp3_src_buffer[which_buffer][frame_offset+2] >> 4;
	98	padding = (mp3_src_buffer[which_buffer][frame_offset+2] & 2) >> 1;
	99
	100	frame_size = 144000*bitrates[bitrate]/44100 + padding;
	101	if (frame_size <= 0) {
	102	lprintf("bad frame, foffs=%i\n", mp3_src_pos - bytes_read);
	103	continue; // bad frame
	104	}
	105
	106	if (bytes_read - frame_offset < frame_size)
	107	{
	108	lprintf("unfit, foffs=%i\n", mp3_src_pos - bytes_read);
	109	mp3_src_pos -= bytes_read - frame_offset;
	110	if (mp3_src_size - mp3_src_pos < frame_size) {
	111	mp3_src_pos = mp3_src_size;
	112	return 0; // EOF
	113	}
	114	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	115	continue; // didn't fit, re-read..
	116	}
	117
	118	if (frame_offset) {
	119	//lprintf("unaligned, foffs=%i, offs=%i\n", mp3_src_pos - bytes_read, frame_offset);
	120	memmove(mp3_src_buffer[which_buffer], mp3_src_buffer[which_buffer] + frame_offset, frame_size);
	121	}
	122
	123	// align for next frame read
	124	mp3_src_pos -= bytes_read - (frame_offset + frame_size);
	125	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	126
	127	break;
	128	}
	129
	130	return frame_size > 0 ? frame_size : -1;
	131	}
	132
	133
	134	static SceUID load_start_module(const char *prxname)
	135	{
	136	SceUID mod, mod1;
	137	int status, ret;
	138
	139	mod = pspSdkLoadStartModule(prxname, PSP_MEMORY_PARTITION_KERNEL);
	140	if (mod < 0) {
	141	lprintf("failed to load %s (%08x), trying kuKernelLoadModule\n", prxname, mod);
	142	mod1 = kuKernelLoadModule(prxname, 0, NULL);
	143	if (mod1 < 0) lprintf("kuKernelLoadModule failed with %08x\n", mod1);
	144	else {
	145	ret = sceKernelStartModule(mod1, 0, NULL, &status, 0);
	146	if (ret < 0) lprintf("sceKernelStartModule failed with %08x\n", ret);
	147	else mod = mod1;
	148	}
	149	}
	150	return mod;
	151	}
	152
	153
	154	int mp3_init(void)
	155	{
	156	SceUID thid, mod;
	157	int ret;
	158
	159	/* load modules */
	160	/* <= 1.5 (and probably some other, not sure which) fw need this to for audiocodec to work,
	161	* so if it fails, assume we are just on new enough firmware and continue.. */
	162	load_start_module("flash0:/kd/me_for_vsh.prx");
	163
	164	if (sceKernelDevkitVersion() < 0x02070010)
	165	mod = load_start_module("flash0:/kd/audiocodec.prx");
	166	else mod = load_start_module("flash0:/kd/avcodec.prx");
	167	if (mod < 0) {
	168	ret = mod;
	169	mod = load_start_module("flash0:/kd/audiocodec_260.prx"); // last chance..
	170	if (mod < 0) goto fail;
	171	}
	172
	173	/* audiocodec init */
	174	memset(mp3_codec_struct, 0, sizeof(mp3_codec_struct));
	175	ret = sceAudiocodecCheckNeedMem(mp3_codec_struct, 0x1002);
	176	if (ret < 0) {
	177	lprintf("sceAudiocodecCheckNeedMem failed with %08x\n", ret);
	178	goto fail;
	179	}
	180
	181	ret = sceAudiocodecGetEDRAM(mp3_codec_struct, 0x1002);
	182	if (ret < 0) {
	183	lprintf("sceAudiocodecGetEDRAM failed with %08x\n", ret);
	184	goto fail;
	185	}
	186
	187	ret = sceAudiocodecInit(mp3_codec_struct, 0x1002);
	188	if (ret < 0) {
	189	lprintf("sceAudiocodecInit failed with %08x\n", ret);
	190	goto fail1;
	191	}
	192
	193	/* thread and stuff */
	194	thread_job_sem = sceKernelCreateSema("p_mp3job_sem", 0, 0, 1, NULL);
	195	if (thread_job_sem < 0) {
	196	lprintf("sceKernelCreateSema() failed: %08x\n", thread_job_sem);
	197	ret = thread_job_sem;
	198	goto fail1;
	199	}
	200
	201	thread_busy_sem = sceKernelCreateSema("p_mp3busy_sem", 0, 1, 1, NULL);
	202	if (thread_busy_sem < 0) {
	203	lprintf("sceKernelCreateSema() failed: %08x\n", thread_busy_sem);
	204	ret = thread_busy_sem;
	205	goto fail2;
	206	}
	207
	208	/* use slightly higher prio then main */
	209	thread_exit = 0;
	210	thid = sceKernelCreateThread("mp3decode_thread", decode_thread, 30, 0x2000, 0, NULL);
	211	if (thid < 0) {
	212	lprintf("failed to create decode thread: %08x\n", thid);
	213	ret = thid;
	214	goto fail3;
	215	}
	216	ret = sceKernelStartThread(thid, 0, 0);
	217	if (ret < 0) {
	218	lprintf("failed to start decode thread: %08x\n", ret);
	219	goto fail3;
	220	}
	221
	222	mp3_last_error = 0;
	223	initialized = 1;
	224	return 0;
	225
	226	fail3:
	227	sceKernelDeleteSema(thread_busy_sem);
	228	thread_busy_sem = -1;
	229	fail2:
	230	sceKernelDeleteSema(thread_job_sem);
	231	thread_job_sem = -1;
	232	fail1:
	233	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
	234	fail:
	235	mp3_last_error = ret;
	236	initialized = 0;
	237	return 1;
	238	}
	239
	240	void mp3_deinit(void)
	241	{
	242	lprintf("mp3_deinit, initialized=%i\n", initialized);
	243
	244	if (!initialized) return;
	245	thread_exit = 1;
	246	psp_sem_lock(thread_busy_sem);
	247	psp_sem_unlock(thread_busy_sem);
	248
	249	sceKernelSignalSema(thread_job_sem, 1);
	250	sceKernelDelayThread(100*1000);
	251
	252	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	253	mp3_handle = -1;
	254	mp3_fname = NULL;
	255
	256	sceKernelDeleteSema(thread_busy_sem);
	257	thread_busy_sem = -1;
	258	sceKernelDeleteSema(thread_job_sem);
	259	thread_job_sem = -1;
	260	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
	261	initialized = 0;
	262	}
	263
	264	// may overflow stack?
	265	static int decode_thread(SceSize args, void *argp)
	266	{
	267	int ret, frame_size;
	268
	269	lprintf("decode_thread started with id %08x, priority %i\n",
	270	sceKernelGetThreadId(), sceKernelGetThreadCurrentPriority());
	271
	272	while (!thread_exit)
	273	{
	274	psp_sem_lock(thread_job_sem);
	275	if (thread_exit) break;
	276
	277	psp_sem_lock(thread_busy_sem);
	278	//lprintf("{ job\n");
	279
	280	frame_size = read_next_frame(working_buf);
	281	if (frame_size > 0)
	282	{
	283	mp3_codec_struct[6] = (unsigned long)mp3_src_buffer[working_buf];
	284	mp3_codec_struct[8] = (unsigned long)mp3_mix_buffer[working_buf];
	285	mp3_codec_struct[7] = mp3_codec_struct[10] = frame_size;
	286	mp3_codec_struct[9] = 1152 * 4;
	287
	288	ret = sceAudiocodecDecode(mp3_codec_struct, 0x1002);
	289	if (ret < 0) lprintf("sceAudiocodecDecode failed with %08x\n", ret);
	290	}
	291
	292	//lprintf("} job\n");
	293	psp_sem_unlock(thread_busy_sem);
	294	}
	295
	296	lprintf("leaving decode thread\n");
	297	sceKernelExitDeleteThread(0);
	298	return 0;
	299	}
	300
	301
	302	// might be called before initialization
	303	int mp3_get_bitrate(FILE *f, int size)
	304	{
	305	int ret, retval = -1, sample_rate, bitrate;
	306	// filenames are stored instead handles in PSP, due to stupid max open file limit
	307	char fname = (char )f;
	308
	309	/* make sure thread is not busy.. */
	310	if (thread_busy_sem >= 0)
	311	psp_sem_lock(thread_busy_sem);
	312
	313	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	314	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	315	if (mp3_handle < 0) {
	316	lprintf("sceIoOpen(%s) failed\n", fname);
	317	goto end;
	318	}
	319
	320	mp3_src_pos = 0;
	321	ret = read_next_frame(0);
	322	if (ret <= 0) {
	323	lprintf("read_next_frame() failed (%s)\n", fname);
	324	goto end;
	325	}
	326	sample_rate = (mp3_src_buffer[0][2] & 0x0c) >> 2;
	327	bitrate = mp3_src_buffer[0][2] >> 4;
	328
	329	if (sample_rate != 0) {
	330	lprintf("unsupported samplerate (%s)\n", fname);
	331	goto end; // only 44kHz supported..
	332	}
	333	bitrate = bitrates[bitrate];
	334	if (bitrate == 0) {
	335	lprintf("unsupported bitrate (%s)\n", fname);
	336	goto end;
	337	}
	338
	339	/* looking good.. */
	340	retval = bitrate;
	341	end:
	342	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	343	mp3_handle = -1;
	344	mp3_fname = NULL;
	345	if (thread_busy_sem >= 0)
	346	psp_sem_unlock(thread_busy_sem);
	347	if (retval < 0) mp3_last_error = -1; // remember we had a problem..
	348	return retval;
	349	}
	350
	351
	352	static int mp3_job_started = 0, mp3_samples_ready = 0, mp3_buffer_offs = 0, mp3_play_bufsel = 0;
	353
	354	void mp3_start_play(FILE *f, int pos)
	355	{
	356	char fname = (char )f;
	357
	358	if (!initialized) return;
	359
	360	lprintf("mp3_start_play(%s) @ %i\n", fname, pos);
	361	psp_sem_lock(thread_busy_sem);
	362
	363	if (mp3_fname != fname \|\| mp3_handle < 0)
	364	{
	365	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	366	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	367	if (mp3_handle < 0) {
	368	lprintf("sceIoOpen(%s) failed\n", fname);
	369	psp_sem_unlock(thread_busy_sem);
	370	return;
	371	}
	372	mp3_src_size = sceIoLseek32(mp3_handle, 0, PSP_SEEK_END);
	373	mp3_fname = fname;
	374	}
	375
	376	// seek..
	377	mp3_src_pos = (int) (((float)pos / 1023.0f) * (float)mp3_src_size);
	378	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	379	lprintf("seek %i: %i/%i\n", pos, mp3_src_pos, mp3_src_size);
	380
	381	mp3_job_started = 1;
	382	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;
	383	working_buf = 0;
	384
	385	/* send a request to decode first frame */
	386	psp_sem_unlock(thread_busy_sem);
	387	psp_sem_unlock(thread_job_sem);
	388	sceKernelDelayThread(1); // reschedule
	389	}
	390
	391
	392	void mp3_update(int *buffer, int length, int stereo)
	393	{
	394	int length_mp3;
	395
	396	// playback was started, track not ended
	397	if (mp3_handle < 0 \|\| mp3_src_pos >= mp3_src_size) return;
	398
	399	length_mp3 = length;
	400	if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo
	401	else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish
	402
	403	/* do we have to wait? */
	404	if (mp3_job_started && mp3_samples_ready < length_mp3)
	405	{
	406	psp_sem_lock(thread_busy_sem);
	407	psp_sem_unlock(thread_busy_sem);
	408	mp3_job_started = 0;
	409	mp3_samples_ready += 1152;
	410	}
	411
	412	/* mix mp3 data, only stereo */
	413	if (mp3_samples_ready >= length_mp3)
	414	{
	415	int shr = 0;
	416	void (mix_samples)(int dest_buf, short *mp3_buf, int count) = mix_16h_to_32;
	417	if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }
	418	else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }
	419
	420	if (1152 - mp3_buffer_offs >= length_mp3) {
	421	mix_samples(buffer, mp3_mix_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);
	422
	423	mp3_buffer_offs += length_mp3;
	424	} else {
	425	// collect samples from both buffers..
	426	int left = 1152 - mp3_buffer_offs;
	427	if (mp3_play_bufsel == 0)
	428	{
	429	mix_samples(buffer, mp3_mix_buffer[0] + mp3_buffer_offs*2, length<<1);
	430	mp3_buffer_offs = length_mp3 - left;
	431	mp3_play_bufsel = 1;
	432	} else {
	433	mix_samples(buffer, mp3_mix_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);
	434	mp3_buffer_offs = length_mp3 - left;
	435	mix_samples(buffer + ((left>>shr)<<1),
	436	mp3_mix_buffer[0], (mp3_buffer_offs>>shr)<<1);
	437	mp3_play_bufsel = 0;
	438	}
	439	}
	440	mp3_samples_ready -= length_mp3;
	441	}
	442
	443	// ask to decode more if we already can
	444	if (!mp3_job_started)
	445	{
	446	mp3_job_started = 1;
	447	working_buf ^= 1;
	448
	449	/* next job.. */
	450	psp_sem_lock(thread_busy_sem); // just in case
	451	psp_sem_unlock(thread_busy_sem);
	452	psp_sem_unlock(thread_job_sem);
	453	sceKernelDelayThread(1);
	454	}
	455	}
	456
	457
	458	int mp3_get_offset(void) // 0-1023
	459	{
	460	unsigned int offs1024 = 0;
	461	int cdda_on;
	462
	463	cdda_on = (PicoAHW & PAHW_MCD) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&
	464	(Pico_mcd->scd.Status_CDC & 1) && mp3_handle >= 0;
	465
	466	if (cdda_on) {
	467	offs1024 = mp3_src_pos << 7;
	468	offs1024 /= mp3_src_size >> 3;
	469	}
	470	lprintf("offs1024=%u (%i/%i)\n", offs1024, mp3_src_pos, mp3_src_size);
	471
	472	return offs1024;
	473	}
	474
	475
	476	void mp3_reopen_file(void)
	477	{
	478	if (mp3_fname == NULL) return;
	479	lprintf("mp3_reopen_file(%s)\n", mp3_fname);
	480
	481	// try closing, just in case
	482	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	483
	484	mp3_handle = sceIoOpen(mp3_fname, PSP_O_RDONLY, 0777);
	485	if (mp3_handle >= 0)
	486	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	487	lprintf("mp3_reopen_file %s\n", mp3_handle >= 0 ? "ok" : "failed");
	488	}
	489