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WinterMuteWinterMute
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rework modplug example for streaming audio
1 parent 65661df commit ea51918

1 file changed

Lines changed: 141 additions & 181 deletions

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  • audio/modplug-decoding/source

‎audio/modplug-decoding/source/main.c‎

Lines changed: 141 additions & 181 deletions
Original file line numberDiff line numberDiff line change
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#include <3ds.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <malloc.h>
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#include <string.h>
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#include <libmodplug/modplug.h>
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typedef struct
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{
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ModPlugFile *plug;
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ModPlug_Settings settings;
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} ModplugDecoder;
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typedef struct
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{
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void* data;
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size_t size;
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} StaticDataBuffer;
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void staticDataBufferInit(StaticDataBuffer* buffer, void* data, size_t size)
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{
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buffer->data = (int16_t*)linearAlloc(size);
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buffer->size = size;
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memcpy(buffer->data, data, size);
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}
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void staticDataBufferDestroy(StaticDataBuffer* buffer)
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{
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if (buffer)
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linearFree(buffer->data);
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}
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void audioCallback(void *const data) {
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ndspWaveBuf *wbuf = data;
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if(wbuf->status == NDSP_WBUF_DONE) {
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printf("Playback complete, press Start to exit\n");
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wbuf->status = NDSP_WBUF_FREE;
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return;
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}
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}
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int main(int argc, char **argv)
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{
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gfxInitDefault();
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consoleInit(GFX_TOP, NULL);
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ndspInit();
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romfsInit();
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ModplugDecoder decoder;
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/* set up ModPlug settings */
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decoder.settings.mFlags = MODPLUG_ENABLE_OVERSAMPLING | MODPLUG_ENABLE_NOISE_REDUCTION;
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decoder.settings.mChannels = 2;
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decoder.settings.mBits = 16;
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decoder.settings.mFrequency = 44100;
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decoder.settings.mResamplingMode = MODPLUG_RESAMPLE_LINEAR;
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/* Fill with modplug defaults */
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decoder.settings.mStereoSeparation = 128;
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decoder.settings.mMaxMixChannels = 32;
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decoder.settings.mReverbDepth = 0;
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decoder.settings.mReverbDelay = 0;
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decoder.settings.mBassAmount = 0;
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decoder.settings.mBassRange = 0;
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decoder.settings.mSurroundDepth = 0;
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decoder.settings.mSurroundDelay = 0;
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decoder.settings.mLoopCount = -1;
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ModPlug_SetSettings(&decoder.settings);
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/* Get the file size via stat */
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struct stat fileStat;
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stat("romfs:/space_debris.mod", &fileStat);
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size_t bufferSize = fileStat.st_size;
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/* Open the file for reading */
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FILE* file = fopen("romfs:/space_debris.mod", "rb");
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/* Read the file into a buffer */
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void* buffer = (void*)malloc(bufferSize);
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fread(buffer, bufferSize, 1, file);
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/* Load the ModPlug file from the buffer */
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decoder.plug = ModPlug_Load(buffer, bufferSize);
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/* Free the useless buffer now and close the file handle */
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free(buffer);
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fclose(file);
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if (decoder.plug == 0)
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printf("Well shit, could not load file!\n");
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else
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ModPlug_SetMasterVolume(decoder.plug, 128);
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/* Create a new ndspWaveBuf */
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ndspWaveBuf waveBuf;
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/*
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** Create static buffer data and use
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** a redundant size for the test.
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**
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** == WARNING ==
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** Do not actually do this.
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**
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** The decoder size should be looping
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** through calls to ModPlug_Read until nothing
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** can be read anymore.
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**
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** Memory *may* get exhausted if too much is allocated.
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** Implement a way to check that, realloc, etc until a limit
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** of streaming data is hit.
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*/
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size_t decoderSize = 524288 * 50;
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void* decodedBuffer = (void*)malloc(decoderSize);
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size_t decoded = ModPlug_Read(decoder.plug, decodedBuffer, decoderSize);
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StaticDataBuffer staticDataBuffer = {0};
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staticDataBufferInit(&staticDataBuffer, decodedBuffer, decoded);
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printf("Decoded Size: %zu\n", decoded);
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waveBuf.nsamples = ((decoded / 2) / sizeof(int16_t));
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waveBuf.looping = false;
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waveBuf.data_pcm16 = (int16_t*)staticDataBuffer.data;
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DSP_FlushDataCache(waveBuf.data_pcm16, decoded);
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ndspChnReset(0);
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ndspChnSetFormat(0, NDSP_FORMAT_STEREO_PCM16);
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ndspChnSetRate(0, 44100);
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ndspChnSetInterp(0, NDSP_INTERP_POLYPHASE);
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printf("Playing modplug file!\n");
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ndspChnWaveBufAdd(0, &waveBuf);
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ndspSetCallback(audioCallback, &waveBuf);
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// Main loop
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while (aptMainLoop())
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{
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hidScanInput();
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u32 kDown = hidKeysDown();
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if (kDown & KEY_START)
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break; // break in order to return to hbmenu
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// Flush and swap framebuffers
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gfxFlushBuffers();
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gfxSwapBuffers();
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//Wait for VBlank
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gspWaitForVBlank();
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}
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if (decoder.plug != 0)
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ModPlug_Unload(decoder.plug);
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staticDataBufferDestroy(&staticDataBuffer);
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romfsExit();
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ndspExit();
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gfxExit();
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return 0;
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}
1+
#include <3ds.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <malloc.h>
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#include <string.h>
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#include <libmodplug/modplug.h>
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typedef struct
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{
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ModPlugFile *plug;
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ModPlug_Settings settings;
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} ModplugDecoder;
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// roughly a video frame's worth of audio
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static const size_t decoderBufSize = 800 * 2 * 2;
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static ModplugDecoder decoder;
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static ndspWaveBuf wavebufs[2];
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static int nextBuf = 0;
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void audioCallback(void *const data) {
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if(wavebufs[nextBuf].status == NDSP_WBUF_DONE) {
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size_t decoded = ModPlug_Read(decoder.plug, wavebufs[nextBuf].data_pcm16, decoderBufSize);
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if (decoded!=0) {
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wavebufs[nextBuf].nsamples = ((decoded / 2) / sizeof(int16_t));
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DSP_FlushDataCache(wavebufs[nextBuf].data_pcm16, decoded);
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ndspChnWaveBufAdd(0, &wavebufs[nextBuf]);
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nextBuf ^= 1;
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}
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}
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}
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int main(int argc, char **argv)
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{
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gfxInitDefault();
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consoleInit(GFX_TOP, NULL);
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ndspInit();
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romfsInit();
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decoder.settings.mFlags = MODPLUG_ENABLE_OVERSAMPLING | MODPLUG_ENABLE_NOISE_REDUCTION;
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decoder.settings.mChannels = 2;
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decoder.settings.mBits = 16;
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decoder.settings.mFrequency = 44100;
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decoder.settings.mResamplingMode = MODPLUG_RESAMPLE_LINEAR;
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/* Fill with modplug defaults */
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decoder.settings.mStereoSeparation = 128;
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decoder.settings.mMaxMixChannels = 32;
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decoder.settings.mReverbDepth = 0;
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decoder.settings.mReverbDelay = 0;
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decoder.settings.mBassAmount = 0;
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decoder.settings.mBassRange = 0;
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decoder.settings.mSurroundDepth = 0;
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decoder.settings.mSurroundDelay = 0;
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decoder.settings.mLoopCount = -1;
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ModPlug_SetSettings(&decoder.settings);
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struct stat fileStat;
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stat("romfs:/space_debris.mod", &fileStat);
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size_t bufferSize = fileStat.st_size;
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FILE* file = fopen("romfs:/space_debris.mod", "rb");
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void* buffer = (void*)malloc(bufferSize);
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fread(buffer, bufferSize, 1, file);
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decoder.plug = ModPlug_Load(buffer, bufferSize);
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free(buffer);
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fclose(file);
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if (decoder.plug == 0) {
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printf("Couldn't load mod file!\n");
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} else {
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ModPlug_SetMasterVolume(decoder.plug, 128);
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ndspChnReset(0);
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ndspChnSetFormat(0, NDSP_FORMAT_STEREO_PCM16);
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ndspChnSetRate(0, 44100);
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ndspChnSetInterp(0, NDSP_INTERP_POLYPHASE);
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// Set up audiobuffers using linearAlloc
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// This ensures audio data is in contiguous physical ram
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wavebufs[0].data_pcm16 = (int16_t*)linearAlloc(decoderBufSize);
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wavebufs[0].looping = false;
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wavebufs[0].status = NDSP_WBUF_DONE;
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wavebufs[1].data_pcm16 = (int16_t*)linearAlloc(decoderBufSize);
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wavebufs[1].looping = false;
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wavebufs[1].status = NDSP_WBUF_DONE;
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printf("Playing modplug file!\n");
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// Fill the two audio buffers
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audioCallback(NULL);
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audioCallback(NULL);
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// and chain the rest of the audio using the callback
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ndspSetCallback(audioCallback, NULL);
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}
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// Main loop
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while (aptMainLoop())
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{
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hidScanInput();
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u32 kDown = hidKeysDown();
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if (kDown & KEY_START)
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break; // break in order to return to hbmenu
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// Flush and swap framebuffers
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gfxFlushBuffers();
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gfxSwapBuffers();
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//Wait for VBlank
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gspWaitForVBlank();
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}
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if (decoder.plug != 0) {
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ModPlug_Unload(decoder.plug);
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linearFree(wavebufs[0].data_pcm16);
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linearFree(wavebufs[1].data_pcm16);
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}
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romfsExit();
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ndspExit();
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gfxExit();
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return 0;
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}

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