[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 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 = 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;
	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 = (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
fe9e3b25	14	static int initialized = 0;
a6df06b7	15	static SceUID thread_job_sem = -1;
	16	static SceUID thread_busy_sem = -1;
	17	static int thread_exit = 0;
	18
	19	// MPEG-1, layer 3
	20	static int bitrates[] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 };
	21	//static int samplerates[] = { 44100, 48000, 32000, 0 };
	22
	23	#define MIN_INFRAME_SIZE 96
	24	#define IN_BUFFER_SIZE (2*1024)
	25
	26	static unsigned long mp3_codec_struct[65] __attribute__((aligned(64)));
	27
	28	static unsigned char mp3_src_buffer[2][IN_BUFFER_SIZE] __attribute__((aligned(64)));
	29	static short mp3_mix_buffer[2][1152*2] __attribute__((aligned(64)));
	30	static int working_buf = 0;
	31
	32	static const char *mp3_fname = NULL;
	33	static SceUID mp3_handle = -1;
	34	static int mp3_src_pos = 0, mp3_src_size = 0;
	35
	36	static int decode_thread(SceSize args, void *argp);
	37
	38
	39	static void psp_sem_lock(SceUID sem)
2951214e	40	{
a6df06b7	41	int ret = sceKernelWaitSema(sem, 1, 0);
	42	if (ret < 0) lprintf("sceKernelWaitSema(%08x) failed with %08x\n", sem, ret);
	43	}
	44
	45	static void psp_sem_unlock(SceUID sem)
	46	{
	47	int ret = sceKernelSignalSema(sem, 1);
	48	if (ret < 0) lprintf("sceKernelSignalSema(%08x) failed with %08x\n", sem, ret);
	49	}
	50
	51	// only accepts MPEG-1, layer3
	52	static int find_sync_word(unsigned char *data, int len)
	53	{
	54	int i;
	55	for (i = 0; i < len-1; i++)
	56	{
	57	if ( data[i+0] != 0xff) continue;
	58	if ((data[i+1] & 0xfe) == 0xfa) return i;
	59	i++;
	60	}
	61	return -1;
	62	}
	63
	64	static int read_next_frame(int which_buffer)
	65	{
	66	int i, bytes_read, frame_offset;
	67	int bitrate, padding, frame_size = 0;
	68
	69	for (i = 0; i < 32; i++)
	70	{
	71	bytes_read = sceIoRead(mp3_handle, mp3_src_buffer[which_buffer], sizeof(mp3_src_buffer[which_buffer]));
	72	mp3_src_pos += bytes_read;
	73	if (bytes_read < MIN_INFRAME_SIZE) {
	74	mp3_src_pos = mp3_src_size;
	75	return 0; // EOF/IO failure
	76	}
	77	frame_offset = find_sync_word(mp3_src_buffer[which_buffer], bytes_read);
	78	if (frame_offset < 0) {
	79	lprintf("missing syncword, foffs=%i\n", mp3_src_pos - bytes_read);
	80	mp3_src_pos--;
	81	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	82	continue;
	83	}
	84	if (bytes_read - frame_offset < 4) {
	85	lprintf("syncword @ EOB, 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
	91	bitrate = mp3_src_buffer[which_buffer][frame_offset+2] >> 4;
	92	padding = (mp3_src_buffer[which_buffer][frame_offset+2] & 2) >> 1;
	93
	94	frame_size = 144000*bitrates[bitrate]/44100 + padding;
	95	if (frame_size <= 0) {
	96	lprintf("bad frame, foffs=%i\n", mp3_src_pos - bytes_read);
	97	continue; // bad frame
	98	}
	99
fe9e3b25	100	if (bytes_read - frame_offset < frame_size)
fe9e3b25	101	{
a6df06b7	102	lprintf("unfit, foffs=%i\n", mp3_src_pos - bytes_read);
a6df06b7	103	mp3_src_pos -= bytes_read - frame_offset;
fe9e3b25	104	if (mp3_src_size - mp3_src_pos < frame_size) {
	105	mp3_src_pos = mp3_src_size;
	106	return 0; // EOF
	107	}
a6df06b7	108	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	109	continue; // didn't fit, re-read..
	110	}
	111
	112	if (frame_offset) {
60a10527	113	//lprintf("unaligned, foffs=%i, offs=%i\n", mp3_src_pos - bytes_read, frame_offset);
a6df06b7	114	memmove(mp3_src_buffer[which_buffer], mp3_src_buffer[which_buffer] + frame_offset, frame_size);
	115	}
	116
	117	// align for next frame read
	118	mp3_src_pos -= bytes_read - (frame_offset + frame_size);
	119	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	120
	121	break;
	122	}
	123
	124	return frame_size > 0 ? frame_size : -1;
	125	}
	126
	127
	128	static SceUID load_start_module(const char *prxname)
	129	{
	130	SceUID mod = pspSdkLoadStartModule(prxname, PSP_MEMORY_PARTITION_KERNEL);
	131	if (mod < 0)
	132	lprintf("failed to load %s: %08x\n", prxname, mod);
	133	return mod;
	134	}
	135
	136
	137	int mp3_init(void)
	138	{
	139	SceUID thid, mod;
	140	int ret;
	141
	142	/* load modules */
	143	/* <= 1.5 (and probably some other, not sure which) fw need this to for audiocodec to work,
	144	* so if it fails, assume we are just on new enough firmware and continue.. */
	145	load_start_module("flash0:/kd/me_for_vsh.prx");
	146
	147	if (sceKernelDevkitVersion() < 0x02070010)
	148	mod = load_start_module("flash0:/kd/audiocodec.prx");
	149	else mod = load_start_module("flash0:/kd/avcodec.prx");
	150	if (mod < 0) {
	151	ret = mod = load_start_module("flash0:/kd/audiocodec_260.prx"); // last chance..
	152	if (mod < 0) goto fail;
	153	}
	154
	155	/* audiocodec init */
	156	memset(mp3_codec_struct, 0, sizeof(mp3_codec_struct));
	157	ret = sceAudiocodecCheckNeedMem(mp3_codec_struct, 0x1002);
	158	if (ret < 0) {
	159	lprintf("sceAudiocodecCheckNeedMem failed with %08x\n", ret);
	160	goto fail;
	161	}
	162
	163	ret = sceAudiocodecGetEDRAM(mp3_codec_struct, 0x1002);
	164	if (ret < 0) {
	165	lprintf("sceAudiocodecGetEDRAM failed with %08x\n", ret);
	166	goto fail;
	167	}
	168
	169	ret = sceAudiocodecInit(mp3_codec_struct, 0x1002);
	170	if (ret < 0) {
	171	lprintf("sceAudiocodecInit failed with %08x\n", ret);
	172	goto fail1;
	173	}
	174
	175	/* thread and stuff */
	176	thread_job_sem = sceKernelCreateSema("p_mp3job_sem", 0, 0, 1, NULL);
	177	if (thread_job_sem < 0) {
178	lprintf("sceKernelCreateSema() failed: %08x\n", thread_job_sem);
179	ret = thread_job_sem;
180	goto fail1;
181	}
182
183	thread_busy_sem = sceKernelCreateSema("p_mp3busy_sem", 0, 1, 1, NULL);
184	if (thread_busy_sem < 0) {
185	lprintf("sceKernelCreateSema() failed: %08x\n", thread_busy_sem);
186	ret = thread_busy_sem;
187	goto fail2;
188	}
189
a6df06b7	190	thread_exit = 0;
	191	thid = sceKernelCreateThread("mp3decode_thread", decode_thread, 30, 0x2000, 0, 0); /* use slightly higher prio then main */
	192	if (thid < 0) {
	193	lprintf("failed to create decode thread: %08x\n", thid);
	194	ret = thid;
	195	goto fail3;
	196	}
	197	ret = sceKernelStartThread(thid, 0, 0);
	198	if (ret < 0) {
	199	lprintf("failed to start decode thread: %08x\n", ret);
	200	goto fail3;
	201	}
	202
	203	mp3_last_error = 0;
fe9e3b25	204	initialized = 1;
2951214e	205	return 0;
a6df06b7	206
	207	fail3:
	208	sceKernelDeleteSema(thread_busy_sem);
	209	thread_busy_sem = -1;
	210	fail2:
	211	sceKernelDeleteSema(thread_job_sem);
	212	thread_job_sem = -1;
	213	fail1:
	214	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
	215	fail:
	216	mp3_last_error = ret;
fe9e3b25	217	initialized = 0;
a6df06b7	218	return 1;
2951214e	219	}
2951214e	220
a6df06b7	221	void mp3_deinit(void)
2951214e	222	{
fe9e3b25	223	lprintf("mp3_deinit, initialized=%i\n", initialized);
	224
	225	if (!initialized) return;
a6df06b7	226	thread_exit = 1;
	227	psp_sem_lock(thread_busy_sem);
	228	psp_sem_unlock(thread_busy_sem);
	229
	230	sceKernelSignalSema(thread_job_sem, 1);
	231	sceKernelDelayThread(100*1000);
	232
	233	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	234	mp3_handle = -1;
	235	mp3_fname = NULL;
	236
	237	sceKernelDeleteSema(thread_busy_sem);
	238	thread_busy_sem = -1;
	239	sceKernelDeleteSema(thread_job_sem);
	240	thread_job_sem = -1;
	241	sceAudiocodecReleaseEDRAM(mp3_codec_struct);
fe9e3b25	242	initialized = 0;
2951214e	243	}
2951214e	244
a6df06b7	245	// may overflow stack?
a6df06b7	246	static int decode_thread(SceSize args, void *argp)
2951214e	247	{
a6df06b7	248	int ret, frame_size;
	249
	250	lprintf("decode_thread started with id %08x, priority %i\n",
	251	sceKernelGetThreadId(), sceKernelGetThreadCurrentPriority());
	252
	253	while (!thread_exit)
	254	{
	255	psp_sem_lock(thread_job_sem);
	256	if (thread_exit) break;
	257
	258	psp_sem_lock(thread_busy_sem);
	259	//lprintf("{ job\n");
	260
	261	frame_size = read_next_frame(working_buf);
	262	if (frame_size > 0)
	263	{
	264	mp3_codec_struct[6] = (unsigned long)mp3_src_buffer[working_buf];
	265	mp3_codec_struct[8] = (unsigned long)mp3_mix_buffer[working_buf];
	266	mp3_codec_struct[7] = mp3_codec_struct[10] = frame_size;
	267	mp3_codec_struct[9] = 1152 * 4;
	268
	269	ret = sceAudiocodecDecode(mp3_codec_struct, 0x1002);
	270	if (ret < 0) lprintf("sceAudiocodecDecode failed with %08x\n", ret);
	271	}
	272
	273	//lprintf("} job\n");
	274	psp_sem_unlock(thread_busy_sem);
	275	}
	276
	277	lprintf("leaving decode thread\n");
	278	sceKernelExitDeleteThread(0);
2951214e	279	return 0;
	280	}
	281
a6df06b7	282
fe9e3b25	283	// might be called before initialization
a6df06b7	284	int mp3_get_bitrate(FILE *f, int size)
a6df06b7	285	{
5ecedd0c	286	int ret, retval = -1, sample_rate, bitrate;
a6df06b7	287	// filenames are stored instead handles in PSP, due to stupid max open file limit
	288	char fname = (char )f;
	289
	290	/* make sure thread is not busy.. */
fe9e3b25	291	if (thread_busy_sem >= 0)
fe9e3b25	292	psp_sem_lock(thread_busy_sem);
a6df06b7	293
	294	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	295	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	296	if (mp3_handle < 0) {
	297	lprintf("sceIoOpen(%s) failed\n", fname);
	298	goto end;
	299	}
	300
	301	mp3_src_pos = 0;
	302	ret = read_next_frame(0);
	303	if (ret <= 0) {
fe9e3b25	304	lprintf("read_next_frame() failed (%s)\n", fname);
a6df06b7	305	goto end;
	306	}
	307	sample_rate = (mp3_src_buffer[0][2] & 0x0c) >> 2;
	308	bitrate = mp3_src_buffer[0][2] >> 4;
	309
	310	if (sample_rate != 0) {
fe9e3b25	311	lprintf("unsupported samplerate (%s)\n", fname);
a6df06b7	312	goto end; // only 44kHz supported..
	313	}
	314	bitrate = bitrates[bitrate];
	315	if (bitrate == 0) {
fe9e3b25	316	lprintf("unsupported bitrate (%s)\n", fname);
a6df06b7	317	goto end;
	318	}
	319
	320	/* looking good.. */
5ecedd0c	321	retval = bitrate;
a6df06b7	322	end:
	323	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	324	mp3_handle = -1;
	325	mp3_fname = NULL;
fe9e3b25	326	if (thread_busy_sem >= 0)
fe9e3b25	327	psp_sem_unlock(thread_busy_sem);
5ecedd0c	328	if (retval < 0) mp3_last_error = -1; // remember we had a problem..
5ecedd0c	329	return retval;
a6df06b7	330	}
	331
	332
	333	static int mp3_job_started = 0, mp3_samples_ready = 0, mp3_buffer_offs = 0, mp3_play_bufsel = 0;
	334
	335	void mp3_start_play(FILE *f, int pos)
	336	{
	337	char fname = (char )f;
	338
fe9e3b25	339	if (!initialized) return;
fe9e3b25	340
a6df06b7	341	lprintf("mp3_start_play(%s) @ %i\n", fname, pos);
	342	psp_sem_lock(thread_busy_sem);
	343
60a10527	344	if (mp3_fname != fname \|\| mp3_handle < 0)
a6df06b7	345	{
	346	if (mp3_handle >= 0) sceIoClose(mp3_handle);
	347	mp3_handle = sceIoOpen(fname, PSP_O_RDONLY, 0777);
	348	if (mp3_handle < 0) {
	349	lprintf("sceIoOpen(%s) failed\n", fname);
	350	psp_sem_unlock(thread_busy_sem);
	351	return;
	352	}
	353	mp3_src_size = sceIoLseek32(mp3_handle, 0, PSP_SEEK_END);
	354	mp3_fname = fname;
	355	}
	356
	357	// seek..
	358	mp3_src_pos = (int) (((float)pos / 1023.0f) * (float)mp3_src_size);
	359	sceIoLseek32(mp3_handle, mp3_src_pos, PSP_SEEK_SET);
	360	lprintf("seek %i: %i/%i\n", pos, mp3_src_pos, mp3_src_size);
	361
	362	mp3_job_started = 1;
	363	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;
	364	working_buf = 0;
	365
	366	/* send a request to decode first frame */
	367	psp_sem_unlock(thread_busy_sem);
	368	psp_sem_unlock(thread_job_sem);
	369	sceKernelDelayThread(1); // reschedule
	370	}
	371
	372
2951214e	373	void mp3_update(int *buffer, int length, int stereo)
2951214e	374	{
a6df06b7	375	int length_mp3;
	376
	377	// playback was started, track not ended
	378	if (mp3_handle < 0 \|\| mp3_src_pos >= mp3_src_size) return;
	379
	380	length_mp3 = length;
	381	if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo
	382	else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish
	383
	384	/* do we have to wait? */
	385	if (mp3_job_started && mp3_samples_ready < length_mp3)
	386	{
	387	psp_sem_lock(thread_busy_sem);
	388	psp_sem_unlock(thread_busy_sem);
	389	mp3_job_started = 0;
	390	mp3_samples_ready += 1152;
	391	}
	392
	393	/* mix mp3 data, only stereo */
	394	if (mp3_samples_ready >= length_mp3)
	395	{
	396	int shr = 0;
	397	void (mix_samples)(int dest_buf, short *mp3_buf, int count) = mix_16h_to_32;
	398	if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }
	399	else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }
	400
	401	if (1152 - mp3_buffer_offs >= length_mp3) {
	402	mix_samples(buffer, mp3_mix_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);
	403
	404	mp3_buffer_offs += length_mp3;
	405	} else {
	406	// collect samples from both buffers..
	407	int left = 1152 - mp3_buffer_offs;
	408	if (mp3_play_bufsel == 0)
	409	{
	410	mix_samples(buffer, mp3_mix_buffer[0] + mp3_buffer_offs*2, length<<1);
	411	mp3_buffer_offs = length_mp3 - left;
	412	mp3_play_bufsel = 1;
	413	} else {
	414	mix_samples(buffer, mp3_mix_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);
	415	mp3_buffer_offs = length_mp3 - left;
	416	mix_samples(buffer + ((left>>shr)<<1),
	417	mp3_mix_buffer[0], (mp3_buffer_offs>>shr)<<1);
	418	mp3_play_bufsel = 0;
	419	}
	420	}
	421	mp3_samples_ready -= length_mp3;
	422	}
	423
	424	// ask to decode more if we already can
	425	if (!mp3_job_started)
	426	{
	427	mp3_job_started = 1;
	428	working_buf ^= 1;
	429
	430	/* next job.. */
	431	psp_sem_lock(thread_busy_sem); // just in case
	432	psp_sem_unlock(thread_busy_sem);
	433	psp_sem_unlock(thread_job_sem);
	434	sceKernelDelayThread(1);
	435	}
	436	}
	437
	438
439	int mp3_get_offset(void) // 0-1023
440	{
441	unsigned int offs1024 = 0;
442	int cdda_on;
443
444	cdda_on = (PicoMCD & 1) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&
445	(Pico_mcd->scd.Status_CDC & 1) && mp3_handle >= 0;
446
447	if (cdda_on) {
448	offs1024 = mp3_src_pos << 7;
449	offs1024 /= mp3_src_size >> 3;
450	}
451	lprintf("offs1024=%u (%i/%i)\n", offs1024, mp3_src_pos, mp3_src_size);
452
453	return offs1024;
2951214e	454	}
2951214e	455
a6df06b7	456