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PSP Release Guide

Converting MIDI files into a playable music application on the PlayStation Portable (PSP) involves several steps, including preparing your MIDI files, converting them into a format compatible with the PSP’s audio system, developing a homebrew application to play the music, and running it on the PSP console. Below is a detailed, step-by-step guide to help you through the process.

Prerequisites

Before you begin, ensure you have the following:

Step 1: Prepare Your MIDI File

1. Simplify the MIDI File

Recommended MIDI Editors:

Step 2: Convert MIDI Files to Audio Format

1. Understand PSP Audio Formats

2. Convert MIDI to WAV or MP3 Format

Recommended Tools:

Steps to Convert:

3. Optimize the Audio File

Step 3: Set Up the PSP Development Environment

1. Install PSP SDK

2. Install Toolchain and Build PSPSDK

Note: Building the toolchain may take some time.

3. Set Environment Variables

Step 4: Set Up Your PSP Homebrew Project

1. Create a New Project Directory

2. Set Up the Directory Structure

Step 5: Write the Homebrew Application

1. Create main.c in the src Directory

#include <pspkernel.h>
#include <pspdisplay.h>
#include <pspdebug.h>
#include <pspaudio.h>
#include <pspaudiolib.h>
#include <pspctrl.h>
#include <stdio.h>
#include <stdlib.h>

PSP_MODULE_INFO("PSP Music Player", 0, 1, 0);
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER);

int exitCallback(int arg1, int arg2, void *common) {
    sceKernelExitGame();
    return 0;
}

int callbackThread(SceSize args, void *argp) {
    int cbid;
    cbid = sceKernelCreateCallback("Exit Callback", exitCallback, NULL);
    sceKernelRegisterExitCallback(cbid);
    sceKernelSleepThreadCB();
    return 0;
}

int setupCallbacks(void) {
    int thid = 0;
    thid = sceKernelCreateThread("Update Thread", callbackThread, 0x11, 0xFA0, THREAD_ATTR_USER, 0);
    if (thid >= 0) {
        sceKernelStartThread(thid, 0, 0);
    }
    return thid;
}

int main(int argc, char *argv[]) {
    pspDebugScreenInit();
    setupCallbacks();

    pspDebugScreenPrintf("PSP Music Player\n");

    // Initialize audio
    int audioChannel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, PSP_AUDIO_SAMPLE_ALIGN(512), PSP_AUDIO_FORMAT_STEREO);
    if (audioChannel < 0) {
        pspDebugScreenPrintf("Failed to reserve audio channel.\n");
        sceKernelSleepThread();
    }

    // Load audio file
    FILE *file = fopen("ms0:/PSP/GAME/psp_music_player/assets/your_song.wav", "rb");
    if (!file) {
        pspDebugScreenPrintf("Failed to open audio file.\n");
        sceKernelSleepThread();
    }

    // Skip WAV header (44 bytes)
    fseek(file, 44, SEEK_SET);

    // Buffer to hold audio data
    short audioBuffer[512 * 2];

    // Main loop
    SceCtrlData ctrlData;
    while (1) {
        sceCtrlReadBufferPositive(&ctrlData, 1);
        if (ctrlData.Buttons & PSP_CTRL_START) {
            break;
        }

        // Read audio data
        size_t read = fread(audioBuffer, sizeof(short), 512 * 2, file);
        if (read == 0) {
            // Restart playback
            fseek(file, 44, SEEK_SET);
            continue;
        }

        // Play audio
        sceAudioOutputPannedBlocking(audioChannel, PSP_AUDIO_VOLUME_MAX, PSP_AUDIO_VOLUME_MAX, audioBuffer);

        // Small delay
        sceKernelDelayThread(1000);
    }

    // Clean up
    fclose(file);
    sceAudioChRelease(audioChannel);
    sceKernelExitGame();
    return 0;
}

2. Update the Makefile

3. Update File Paths

Step 6: Build the Homebrew Application

1. Open a Terminal or Command Prompt

2. Run the Build Command

make

3. Troubleshooting

Step 7: Transfer the Application to the PSP

1. Connect Your PSP to the Computer

2. Copy the Application to the PSP

3. Verify the File Structure

Step 8: Run the Homebrew Application on Your PSP

1. Disconnect the PSP

2. Launch the Application

3. Control the Application

Additional Tips

Summary

By following these steps, you can successfully convert MIDI files into a playable music application on the PlayStation Portable:

  1. Prepare and convert your MIDI file into an audio format compatible with the PSP.

  2. Install PSP development tools, including PSPSDK and necessary compilers.

  3. Set up your project structure with appropriate directories and files.

  4. Write a homebrew application that plays your audio file on the PSP.

  5. Configure the Makefile to compile your application.

  6. Build your application to create an EBOOT.PBP file.

  7. Transfer the application to your PSP via USB or Memory Stick.

  8. Run the homebrew application on your PSP using the Game menu.

This process allows you to experience custom music on your PSP console and provides valuable experience in homebrew development.

Disclaimer: Modifying your PlayStation Portable console and running homebrew applications can void your warranty and may be illegal in some jurisdictions. Always ensure you are complying with local laws and do not engage in piracy or distribute copyrighted material.

Appendix: Additional Resources