[libpicofe.git] / psp / mp3.c

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

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

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

int mp3_last_error = 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;
			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 = pspSdkLoadStartModule(prxname, PSP_MEMORY_PARTITION_KERNEL);
	if (mod < 0)
		lprintf("failed to load %s: %08x\n", prxname, mod);
	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 = 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;
	}

	thread_exit = 0;
	thid = sceKernelCreateThread("mp3decode_thread", decode_thread, 30, 0x2000, 0, 0); /* use slightly higher prio then main */
	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;
	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;
	return 1;
}

void mp3_deinit(void)
{
	lprintf("deinit\n");
	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);
}

// 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;
}


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.. */
	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\n");
		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\n");
		goto end; // only 44kHz supported..
	}
	bitrate = bitrates[bitrate];
	if (bitrate == 0) {
		lprintf("unsupported bitrate\n");
		goto end;
	}

	/* looking good.. */
	retval = bitrate;
end:
	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	mp3_handle = -1;
	mp3_fname = NULL;
	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;

	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 = (PicoMCD & 1) && (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;
}
Commit	Line	Data
2951214e	1	#include <stdio.h>
a6df06b7	2	#include <string.h>
2951214e	3
a6df06b7	4	#include <pspkernel.h>
	5	#include <pspsdk.h>
	6	#include <pspaudiocodec.h>
	7
	8	#include "../../Pico/PicoInt.h"
	9	#include "../../Pico/sound/mix.h"
	10	#include "../common/lprintf.h"
	11
	12	int mp3_last_error = 0;
	13
	14	static SceUID thread_job_sem = -1;
	15	static SceUID thread_busy_sem = -1;
	16	static int thread_exit = 0;
	17
	18	// MPEG-1, layer 3
	19	static int bitrates[] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 };
	20	//static int samplerates[] = { 44100, 48000, 32000, 0 };
	21
	22	#define MIN_INFRAME_SIZE 96
	23	#define IN_BUFFER_SIZE (2*1024)
	24
	25	static unsigned long mp3_codec_struct[65] __attribute__((aligned(64)));
	26
	27	static unsigned char mp3_src_buffer[2][IN_BUFFER_SIZE] __attribute__((aligned(64)));
	28	static short mp3_mix_buffer[2][1152*2] __attribute__((aligned(64)));
	29	static int working_buf = 0;
	30
	31	static const char *mp3_fname = NULL;
	32	static SceUID mp3_handle = -1;
	33	static int mp3_src_pos = 0, mp3_src_size = 0;
	34
	35	static int decode_thread(SceSize args, void *argp);
	36
	37
	38	static void psp_sem_lock(SceUID sem)
2951214e	39	{
a6df06b7	40	int ret = sceKernelWaitSema(sem, 1, 0);
	41	if (ret < 0) lprintf("sceKernelWaitSema(%08x) failed with %08x\n", sem, ret);
	42	}
	43
	44	static void psp_sem_unlock(SceUID sem)
	45	{
	46	int ret = sceKernelSignalSema(sem, 1);
	47	if (ret < 0) lprintf("sceKernelSignalSema(%08x) failed with %08x\n", sem, ret);
	48	}
	49
	50	// only accepts MPEG-1, layer3
	51	static int find_sync_word(unsigned char *data, int len)
	52	{
	53	int i;
	54	for (i = 0; i < len-1; i++)
	55	{
	56	if ( data[i+0] != 0xff) continue;
	57	if ((data[i+1] & 0xfe) == 0xfa) return i;
	58	i++;
	59	}
	60	return -1;
	61	}
	62
	63	static int read_next_frame(int which_buffer)
	64	{
	65	int i, bytes_read, frame_offset;
	66	int bitrate, padding, frame_size = 0;
	67
	68	for (i = 0; i < 32; i++)
	69	{
	70	bytes_read = sceIoRead(mp3_handle, mp3_src_buffer[which_buffer], sizeof(mp3_src_buffer[which_buffer]));
	71	mp3_src_pos += bytes_read;
	72	if (bytes_read < MIN_INFRAME_SIZE) {
	73	mp3_src_pos = mp3_src_size;
	74	return 0; // EOF/IO failure
	75	}
	76	frame_offset = find_sync_word(mp3_src_buffer[which_buffer], bytes_read);
	77	if (frame_offset < 0) {
	78	lprintf("missing syncword, foffs=%i\n", mp3_src_pos - bytes_read);
	79	mp3_src_pos--;
	80	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	81	continue;
	82	}
	83	if (bytes_read - frame_offset < 4) {
	84	lprintf("syncword @ EOB, foffs=%i\n", mp3_src_pos - bytes_read);
	85	mp3_src_pos--;
	86	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	87	continue;
	88	}
	89
	90	bitrate = mp3_src_buffer[which_buffer][frame_offset+2] >> 4;
	91	padding = (mp3_src_buffer[which_buffer][frame_offset+2] & 2) >> 1;
	92
	93	frame_size = 144000*bitrates[bitrate]/44100 + padding;
	94	if (frame_size <= 0) {
	95	lprintf("bad frame, foffs=%i\n", mp3_src_pos - bytes_read);
	96	continue; // bad frame
	97	}
	98
	99	if (bytes_read - frame_offset < frame_size) {
	100	lprintf("unfit, foffs=%i\n", mp3_src_pos - bytes_read);
	101	mp3_src_pos -= bytes_read - frame_offset;
	102	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	103	continue; // didn't fit, re-read..
104	}
105
106	if (frame_offset) {
60a10527	107	//lprintf("unaligned, foffs=%i, offs=%i\n", mp3_src_pos - bytes_read, frame_offset);
a6df06b7	108	memmove(mp3_src_buffer[which_buffer], mp3_src_buffer[which_buffer] + frame_offset, frame_size);
	109	}
	110
	111	// align for next frame read
	112	mp3_src_pos -= bytes_read - (frame_offset + frame_size);
	113	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	114
	115	break;
	116	}
	117
	118	return frame_size > 0 ? frame_size : -1;
	119	}
	120
	121
	122	static SceUID load_start_module(const char *prxname)
	123	{
	124	SceUID mod = pspSdkLoadStartModule(prxname, PSP_MEMORY_PARTITION_KERNEL);
	125	if (mod < 0)
	126	lprintf("failed to load %s: %08x\n", prxname, mod);
	127	return mod;
	128	}
	129
	130
	131	int mp3_init(void)
	132	{
	133	SceUID thid, mod;
	134	int ret;
	135
	136	/* load modules */
	137	/* <= 1.5 (and probably some other, not sure which) fw need this to for audiocodec to work,
	138	* so if it fails, assume we are just on new enough firmware and continue.. */
	139	load_start_module("flash0:/kd/me_for_vsh.prx");
	140
	141	if (sceKernelDevkitVersion() < 0x02070010)
	142	mod = load_start_module("flash0:/kd/audiocodec.prx");
	143	else mod = load_start_module("flash0:/kd/avcodec.prx");
	144	if (mod < 0) {
	145	ret = mod = load_start_module("flash0:/kd/audiocodec_260.prx"); // last chance..
	146	if (mod < 0) goto fail;
	147	}
	148
	149	/* audiocodec init */
	150	memset(mp3_codec_struct, 0, sizeof(mp3_codec_struct));
	151	ret = sceAudiocodecCheckNeedMem(mp3_codec_struct, 0x1002);
	152	if (ret < 0) {
	153	lprintf("sceAudiocodecCheckNeedMem failed with %08x\n", ret);
	154	goto fail;
	155	}
	156
	157	ret = sceAudiocodecGetEDRAM(mp3_codec_struct, 0x1002);
	158	if (ret < 0) {
	159	lprintf("sceAudiocodecGetEDRAM failed with %08x\n", ret);
	160	goto fail;
	161	}
	162
	163	ret = sceAudiocodecInit(mp3_codec_struct, 0x1002);
	164	if (ret < 0) {
	165	lprintf("sceAudiocodecInit failed with %08x\n", ret);
	166	goto fail1;
	167	}
	168
	169	/* thread and stuff */
	170	thread_job_sem = sceKernelCreateSema("p_mp3job_sem", 0, 0, 1, NULL);
	171	if (thread_job_sem < 0) {
172	lprintf("sceKernelCreateSema() failed: %08x\n", thread_job_sem);
173	ret = thread_job_sem;
174	goto fail1;
175	}
176
177	thread_busy_sem = sceKernelCreateSema("p_mp3busy_sem", 0, 1, 1, NULL);
178	if (thread_busy_sem < 0) {
179	lprintf("sceKernelCreateSema() failed: %08x\n", thread_busy_sem);
180	ret = thread_busy_sem;
181	goto fail2;
182	}
183
a6df06b7	184	thread_exit = 0;
	185	thid = sceKernelCreateThread("mp3decode_thread", decode_thread, 30, 0x2000, 0, 0); /* use slightly higher prio then main */
	186	if (thid < 0) {
	187	lprintf("failed to create decode thread: %08x\n", thid);
	188	ret = thid;
	189	goto fail3;
	190	}
	191	ret = sceKernelStartThread(thid, 0, 0);
	192	if (ret < 0) {
	193	lprintf("failed to start decode thread: %08x\n", ret);
	194	goto fail3;
	195	}
	196
	197	mp3_last_error = 0;
2951214e	198	return 0;
a6df06b7	199
	200	fail3:
	201	sceKernelDeleteSema(thread_busy_sem);
	202	thread_busy_sem = -1;
	203	fail2:
	204	sceKernelDeleteSema(thread_job_sem);
	205	thread_job_sem = -1;
	206	fail1:
	207	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
	208	fail:
	209	mp3_last_error = ret;
	210	return 1;
2951214e	211	}
2951214e	212
a6df06b7	213	void mp3_deinit(void)
2951214e	214	{
a6df06b7	215	lprintf("deinit\n");
	216	thread_exit = 1;
	217	psp_sem_lock(thread_busy_sem);
	218	psp_sem_unlock(thread_busy_sem);
	219
	220	sceKernelSignalSema(thread_job_sem, 1);
	221	sceKernelDelayThread(100*1000);
	222
	223	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	224	mp3_handle = -1;
	225	mp3_fname = NULL;
	226
	227	sceKernelDeleteSema(thread_busy_sem);
	228	thread_busy_sem = -1;
	229	sceKernelDeleteSema(thread_job_sem);
	230	thread_job_sem = -1;
	231	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
2951214e	232	}
2951214e	233
a6df06b7	234	// may overflow stack?
a6df06b7	235	static int decode_thread(SceSize args, void *argp)
2951214e	236	{
a6df06b7	237	int ret, frame_size;
	238
	239	lprintf("decode_thread started with id %08x, priority %i\n",
	240	sceKernelGetThreadId(), sceKernelGetThreadCurrentPriority());
	241
	242	while (!thread_exit)
	243	{
	244	psp_sem_lock(thread_job_sem);
	245	if (thread_exit) break;
	246
	247	psp_sem_lock(thread_busy_sem);
	248	//lprintf("{ job\n");
	249
	250	frame_size = read_next_frame(working_buf);
	251	if (frame_size > 0)
	252	{
	253	mp3_codec_struct[6] = (unsigned long)mp3_src_buffer[working_buf];
	254	mp3_codec_struct[8] = (unsigned long)mp3_mix_buffer[working_buf];
	255	mp3_codec_struct[7] = mp3_codec_struct[10] = frame_size;
	256	mp3_codec_struct[9] = 1152 * 4;
	257
	258	ret = sceAudiocodecDecode(mp3_codec_struct, 0x1002);
	259	if (ret < 0) lprintf("sceAudiocodecDecode failed with %08x\n", ret);
	260	}
	261
	262	//lprintf("} job\n");
	263	psp_sem_unlock(thread_busy_sem);
	264	}
	265
	266	lprintf("leaving decode thread\n");
	267	sceKernelExitDeleteThread(0);
2951214e	268	return 0;
	269	}
	270
a6df06b7	271
	272	int mp3_get_bitrate(FILE *f, int size)
	273	{
5ecedd0c	274	int ret, retval = -1, sample_rate, bitrate;
a6df06b7	275	// filenames are stored instead handles in PSP, due to stupid max open file limit
	276	char fname = (char )f;
	277
	278	/* make sure thread is not busy.. */
	279	psp_sem_lock(thread_busy_sem);
	280
	281	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	282	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	283	if (mp3_handle < 0) {
	284	lprintf("sceIoOpen(%s) failed\n", fname);
	285	goto end;
	286	}
	287
	288	mp3_src_pos = 0;
	289	ret = read_next_frame(0);
	290	if (ret <= 0) {
	291	lprintf("read_next_frame() failed\n");
	292	goto end;
	293	}
	294	sample_rate = (mp3_src_buffer[0][2] & 0x0c) >> 2;
	295	bitrate = mp3_src_buffer[0][2] >> 4;
	296
	297	if (sample_rate != 0) {
	298	lprintf("unsupported samplerate\n");
	299	goto end; // only 44kHz supported..
	300	}
	301	bitrate = bitrates[bitrate];
	302	if (bitrate == 0) {
	303	lprintf("unsupported bitrate\n");
	304	goto end;
	305	}
	306
	307	/* looking good.. */
5ecedd0c	308	retval = bitrate;
a6df06b7	309	end:
	310	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	311	mp3_handle = -1;
	312	mp3_fname = NULL;
	313	psp_sem_unlock(thread_busy_sem);
5ecedd0c	314	if (retval < 0) mp3_last_error = -1; // remember we had a problem..
5ecedd0c	315	return retval;
a6df06b7	316	}
	317
	318
	319	static int mp3_job_started = 0, mp3_samples_ready = 0, mp3_buffer_offs = 0, mp3_play_bufsel = 0;
	320
	321	void mp3_start_play(FILE *f, int pos)
	322	{
	323	char fname = (char )f;
	324
	325	lprintf("mp3_start_play(%s) @ %i\n", fname, pos);
	326	psp_sem_lock(thread_busy_sem);
	327
60a10527	328	if (mp3_fname != fname \|\| mp3_handle < 0)
a6df06b7	329	{
	330	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	331	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	332	if (mp3_handle < 0) {
	333	lprintf("sceIoOpen(%s) failed\n", fname);
	334	psp_sem_unlock(thread_busy_sem);
	335	return;
	336	}
	337	mp3_src_size = sceIoLseek32(mp3_handle, 0, PSP_SEEK_END);
	338	mp3_fname = fname;
	339	}
	340
	341	// seek..
	342	mp3_src_pos = (int) (((float)pos / 1023.0f) * (float)mp3_src_size);
	343	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	344	lprintf("seek %i: %i/%i\n", pos, mp3_src_pos, mp3_src_size);
	345
	346	mp3_job_started = 1;
	347	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;
	348	working_buf = 0;
	349
	350	/* send a request to decode first frame */
	351	psp_sem_unlock(thread_busy_sem);
	352	psp_sem_unlock(thread_job_sem);
	353	sceKernelDelayThread(1); // reschedule
	354	}
	355
	356
2951214e	357	void mp3_update(int *buffer, int length, int stereo)
2951214e	358	{
a6df06b7	359	int length_mp3;
	360
	361	// playback was started, track not ended
	362	if (mp3_handle < 0 \|\| mp3_src_pos >= mp3_src_size) return;
	363
	364	length_mp3 = length;
	365	if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo
	366	else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish
	367
	368	/* do we have to wait? */
	369	if (mp3_job_started && mp3_samples_ready < length_mp3)
	370	{
	371	psp_sem_lock(thread_busy_sem);
	372	psp_sem_unlock(thread_busy_sem);
	373	mp3_job_started = 0;
	374	mp3_samples_ready += 1152;
	375	}
	376
	377	/* mix mp3 data, only stereo */
	378	if (mp3_samples_ready >= length_mp3)
	379	{
	380	int shr = 0;
	381	void (mix_samples)(int dest_buf, short *mp3_buf, int count) = mix_16h_to_32;
	382	if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }
	383	else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }
	384
	385	if (1152 - mp3_buffer_offs >= length_mp3) {
	386	mix_samples(buffer, mp3_mix_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);
	387
	388	mp3_buffer_offs += length_mp3;
	389	} else {
	390	// collect samples from both buffers..
	391	int left = 1152 - mp3_buffer_offs;
	392	if (mp3_play_bufsel == 0)
	393	{
	394	mix_samples(buffer, mp3_mix_buffer[0] + mp3_buffer_offs*2, length<<1);
	395	mp3_buffer_offs = length_mp3 - left;
	396	mp3_play_bufsel = 1;
	397	} else {
	398	mix_samples(buffer, mp3_mix_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);
	399	mp3_buffer_offs = length_mp3 - left;
	400	mix_samples(buffer + ((left>>shr)<<1),
	401	mp3_mix_buffer[0], (mp3_buffer_offs>>shr)<<1);
	402	mp3_play_bufsel = 0;
	403	}
	404	}
	405	mp3_samples_ready -= length_mp3;
	406	}
	407
	408	// ask to decode more if we already can
	409	if (!mp3_job_started)
	410	{
	411	mp3_job_started = 1;
	412	working_buf ^= 1;
	413
	414	/* next job.. */
	415	psp_sem_lock(thread_busy_sem); // just in case
	416	psp_sem_unlock(thread_busy_sem);
	417	psp_sem_unlock(thread_job_sem);
	418	sceKernelDelayThread(1);
	419	}
	420	}
	421
	422
423	int mp3_get_offset(void) // 0-1023
424	{
425	unsigned int offs1024 = 0;
426	int cdda_on;
427
428	cdda_on = (PicoMCD & 1) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&
429	(Pico_mcd->scd.Status_CDC & 1) && mp3_handle >= 0;
430
431	if (cdda_on) {
432	offs1024 = mp3_src_pos << 7;
433	offs1024 /= mp3_src_size >> 3;
434	}
435	lprintf("offs1024=%u (%i/%i)\n", offs1024, mp3_src_pos, mp3_src_size);
436
437	return offs1024;
2951214e	438	}
2951214e	439
a6df06b7	440