149 lines
4.3 KiB
C++
149 lines
4.3 KiB
C++
/***************************************************************************
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* Copyright (C) 2010
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* by Dimok
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any
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* damages arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any
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* purpose, including commercial applications, and to alter it and
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* redistribute it freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you
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* must not claim that you wrote the original software. If you use
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* this software in a product, an acknowledgment in the product
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* documentation would be appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and
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* must not be misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*
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* for WiiXplorer 2010
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***************************************************************************/
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#include "fs/CFile.hpp"
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#include "utils/utils.h"
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#include <gui/sounds/WavDecoder.hpp>
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#include <string.h>
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WavDecoder::WavDecoder(const char *filepath)
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: SoundDecoder(filepath) {
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SoundType = SOUND_WAV;
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SampleRate = 48000;
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Format = CHANNELS_STEREO | FORMAT_PCM_16_BIT;
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if (!file_fd) {
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return;
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}
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OpenFile();
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}
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WavDecoder::WavDecoder(const uint8_t *snd, int32_t len)
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: SoundDecoder(snd, len) {
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SoundType = SOUND_WAV;
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SampleRate = 48000;
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Format = CHANNELS_STEREO | FORMAT_PCM_16_BIT;
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if (!file_fd) {
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return;
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}
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OpenFile();
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}
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WavDecoder::~WavDecoder() {
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}
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void WavDecoder::OpenFile() {
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SWaveHdr Header;
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SWaveFmtChunk FmtChunk;
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memset(&Header, 0, sizeof(SWaveHdr));
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memset(&FmtChunk, 0, sizeof(SWaveFmtChunk));
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file_fd->read((uint8_t *) &Header, sizeof(SWaveHdr));
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file_fd->read((uint8_t *) &FmtChunk, sizeof(SWaveFmtChunk));
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if (Header.magicRIFF != 0x52494646) { // 'RIFF'
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CloseFile();
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return;
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} else if (Header.magicWAVE != 0x57415645) { // 'WAVE'
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CloseFile();
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return;
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} else if (FmtChunk.magicFMT != 0x666d7420) { // 'fmt '
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CloseFile();
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return;
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}
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DataOffset = sizeof(SWaveHdr) + le32(FmtChunk.size) + 8;
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file_fd->seek(DataOffset, SEEK_SET);
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SWaveChunk DataChunk;
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file_fd->read((uint8_t *) &DataChunk, sizeof(SWaveChunk));
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while (DataChunk.magicDATA != 0x64617461) { // 'data'
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DataOffset += 8 + le32(DataChunk.size);
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file_fd->seek(DataOffset, SEEK_SET);
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int32_t ret = file_fd->read((uint8_t *) &DataChunk, sizeof(SWaveChunk));
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if (ret <= 0) {
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CloseFile();
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return;
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}
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}
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DataOffset += 8;
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DataSize = le32(DataChunk.size);
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Is16Bit = (le16(FmtChunk.bps) == 16);
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SampleRate = le32(FmtChunk.freq);
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if (le16(FmtChunk.channels) == 1 && le16(FmtChunk.bps) == 8 && le16(FmtChunk.alignment) <= 1) {
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Format = CHANNELS_MONO | FORMAT_PCM_8_BIT;
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} else if (le16(FmtChunk.channels) == 1 && le16(FmtChunk.bps) == 16 && le16(FmtChunk.alignment) <= 2) {
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Format = CHANNELS_MONO | FORMAT_PCM_16_BIT;
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} else if (le16(FmtChunk.channels) == 2 && le16(FmtChunk.bps) == 8 && le16(FmtChunk.alignment) <= 2) {
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Format = CHANNELS_STEREO | FORMAT_PCM_8_BIT;
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} else if (le16(FmtChunk.channels) == 2 && le16(FmtChunk.bps) == 16 && le16(FmtChunk.alignment) <= 4) {
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Format = CHANNELS_STEREO | FORMAT_PCM_16_BIT;
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}
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}
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void WavDecoder::CloseFile() {
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if (file_fd) {
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delete file_fd;
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}
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file_fd = NULL;
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}
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int32_t WavDecoder::Read(uint8_t *buffer, int32_t buffer_size, int32_t pos) {
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if (!file_fd) {
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return -1;
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}
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if (CurPos >= (int32_t) DataSize) {
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return 0;
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}
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file_fd->seek(DataOffset + CurPos, SEEK_SET);
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if (buffer_size > (int32_t) DataSize - CurPos) {
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buffer_size = DataSize - CurPos;
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}
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int32_t read = file_fd->read(buffer, buffer_size);
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if (read > 0) {
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if (Is16Bit) {
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read &= ~0x0001;
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for (uint32_t i = 0; i < (uint32_t) (read / sizeof(uint16_t)); ++i) {
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((uint16_t *) buffer)[i] = le16(((uint16_t *) buffer)[i]);
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}
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}
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CurPos += read;
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}
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return read;
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}
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