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/*
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SDL_mixer: An audio mixer library based on the SDL library
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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/* $Id$ */
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/* This file supports streaming WAV files, without volume adjustment */
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27 |
#include <stdlib.h>
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#include <string.h>
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29 |
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#include "SDL_audio.h"
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#include "SDL_mutex.h"
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#include "SDL_rwops.h"
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#include "SDL_endian.h"
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#include "SDL_mixer.h"
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#include "wavestream.h"
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/*
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Taken with permission from SDL_wave.h, part of the SDL library,
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available at: http://www.libsdl.org/
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and placed under the same license as this mixer library.
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*/
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/* WAVE files are little-endian */
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45 |
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/*******************************************/
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/* Define values for Microsoft WAVE format */
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/*******************************************/
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#define RIFF 0x46464952 /* "RIFF" */
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#define WAVE 0x45564157 /* "WAVE" */
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#define FACT 0x74636166 /* "fact" */
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#define LIST 0x5453494c /* "LIST" */
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#define FMT 0x20746D66 /* "fmt " */
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#define DATA 0x61746164 /* "data" */
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#define PCM_CODE 1
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#define ADPCM_CODE 2
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#define WAVE_MONO 1
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#define WAVE_STEREO 2
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/* Normally, these three chunks come consecutively in a WAVE file */
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typedef struct WaveFMT {
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/* Not saved in the chunk we read:
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Uint32 FMTchunk;
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Uint32 fmtlen;
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*/
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Uint16 encoding;
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Uint16 channels; /* 1 = mono, 2 = stereo */
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Uint32 frequency; /* One of 11025, 22050, or 44100 Hz */
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Uint32 byterate; /* Average bytes per second */
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Uint16 blockalign; /* Bytes per sample block */
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Uint16 bitspersample; /* One of 8, 12, 16, or 4 for ADPCM */
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} WaveFMT;
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/* The general chunk found in the WAVE file */
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typedef struct Chunk {
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Uint32 magic;
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Uint32 length;
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Uint8 *data; /* Data includes magic and length */
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} Chunk;
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/*********************************************/
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/* Define values for AIFF (IFF audio) format */
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/*********************************************/
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#define FORM 0x4d524f46 /* "FORM" */
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#define AIFF 0x46464941 /* "AIFF" */
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#define SSND 0x444e5353 /* "SSND" */
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#define COMM 0x4d4d4f43 /* "COMM" */
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/* Currently we only support a single stream at a time */
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static WAVStream *music = NULL;
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/* This is the format of the audio mixer data */
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static SDL_AudioSpec mixer;
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slouken@214
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static int wavestream_volume = MIX_MAX_VOLUME;
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slouken@0
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slouken@0
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/* Function to load the WAV/AIFF stream */
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static SDL_RWops *LoadWAVStream (SDL_RWops *rw, SDL_AudioSpec *spec,
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slouken@0
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long *start, long *stop);
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slouken@381
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static SDL_RWops *LoadAIFFStream (SDL_RWops *rw, SDL_AudioSpec *spec,
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long *start, long *stop);
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slouken@0
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/* Initialize the WAVStream player, with the given mixer settings
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This function returns 0, or -1 if there was an error.
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105 |
*/
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slouken@0
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int WAVStream_Init(SDL_AudioSpec *mixerfmt)
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slouken@0
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107 |
{
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slouken@0
|
108 |
mixer = *mixerfmt;
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slouken@0
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109 |
return(0);
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110 |
}
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slouken@0
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111 |
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slouken@214
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112 |
void WAVStream_SetVolume(int volume)
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slouken@0
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113 |
{
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slouken@214
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114 |
wavestream_volume = volume;
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slouken@0
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115 |
}
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slouken@0
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116 |
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slouken@381
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117 |
WAVStream *WAVStream_LoadSong(const char *file, const char *magic)
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slouken@381
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118 |
{
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slouken@381
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119 |
SDL_RWops *rw;
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slouken@381
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120 |
WAVStream *wave;
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slouken@381
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121 |
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slouken@381
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122 |
rw = SDL_RWFromFile(file, "rb");
|
slouken@381
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123 |
if ( rw == NULL ) {
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slouken@381
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124 |
SDL_SetError("Couldn't open %s", file);
|
slouken@381
|
125 |
return NULL;
|
slouken@381
|
126 |
}
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slouken@381
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127 |
wave = WAVStream_LoadSong_RW(rw, magic);
|
slouken@381
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128 |
if ( wave == NULL ) {
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slouken@381
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129 |
SDL_FreeRW(rw);
|
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130 |
return NULL;
|
slouken@381
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131 |
}
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slouken@381
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132 |
return wave;
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slouken@381
|
133 |
}
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slouken@381
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134 |
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slouken@0
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135 |
/* Load a WAV stream from the given file */
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slouken@381
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136 |
WAVStream *WAVStream_LoadSong_RW(SDL_RWops *rw, const char *magic)
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slouken@0
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137 |
{
|
slouken@0
|
138 |
WAVStream *wave;
|
slouken@0
|
139 |
SDL_AudioSpec wavespec;
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slouken@0
|
140 |
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slouken@0
|
141 |
if ( ! mixer.format ) {
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142 |
Mix_SetError("WAV music output not started");
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|
143 |
return(NULL);
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|
144 |
}
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slouken@0
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145 |
wave = (WAVStream *)malloc(sizeof *wave);
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|
146 |
if ( wave ) {
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slouken@0
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147 |
memset(wave, 0, (sizeof *wave));
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slouken@0
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148 |
if ( strcmp(magic, "RIFF") == 0 ) {
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slouken@381
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149 |
wave->rw = LoadWAVStream(rw, &wavespec,
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slouken@0
|
150 |
&wave->start, &wave->stop);
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slouken@0
|
151 |
} else
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|
152 |
if ( strcmp(magic, "FORM") == 0 ) {
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slouken@381
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153 |
wave->rw = LoadAIFFStream(rw, &wavespec,
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slouken@0
|
154 |
&wave->start, &wave->stop);
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155 |
} else {
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|
156 |
Mix_SetError("Unknown WAVE format");
|
slouken@0
|
157 |
}
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slouken@381
|
158 |
if ( wave->rw == NULL ) {
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slouken@0
|
159 |
free(wave);
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slouken@0
|
160 |
return(NULL);
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slouken@0
|
161 |
}
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slouken@0
|
162 |
SDL_BuildAudioCVT(&wave->cvt,
|
slouken@0
|
163 |
wavespec.format, wavespec.channels, wavespec.freq,
|
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|
164 |
mixer.format, mixer.channels, mixer.freq);
|
slouken@0
|
165 |
}
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slouken@0
|
166 |
return(wave);
|
slouken@0
|
167 |
}
|
slouken@0
|
168 |
|
slouken@0
|
169 |
/* Start playback of a given WAV stream */
|
slouken@214
|
170 |
void WAVStream_Start(WAVStream *wave)
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slouken@0
|
171 |
{
|
slouken@381
|
172 |
SDL_RWseek (wave->rw, wave->start, SEEK_SET);
|
slouken@173
|
173 |
music = wave;
|
slouken@0
|
174 |
}
|
slouken@0
|
175 |
|
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|
176 |
/* Play some of a stream previously started with WAVStream_Start() */
|
slouken@214
|
177 |
void WAVStream_PlaySome(Uint8 *stream, int len)
|
slouken@0
|
178 |
{
|
slouken@0
|
179 |
long pos;
|
slouken@0
|
180 |
|
slouken@381
|
181 |
if ( music && ((pos=SDL_RWtell(music->rw)) < music->stop) ) {
|
slouken@173
|
182 |
if ( music->cvt.needed ) {
|
slouken@0
|
183 |
int original_len;
|
slouken@0
|
184 |
|
slouken@173
|
185 |
original_len=(int)((double)len/music->cvt.len_ratio);
|
slouken@173
|
186 |
if ( music->cvt.len != original_len ) {
|
slouken@0
|
187 |
int worksize;
|
slouken@173
|
188 |
if ( music->cvt.buf != NULL ) {
|
slouken@173
|
189 |
free(music->cvt.buf);
|
slouken@0
|
190 |
}
|
slouken@173
|
191 |
worksize = original_len*music->cvt.len_mult;
|
slouken@173
|
192 |
music->cvt.buf=(Uint8 *)malloc(worksize);
|
slouken@173
|
193 |
if ( music->cvt.buf == NULL ) {
|
slouken@0
|
194 |
return;
|
slouken@0
|
195 |
}
|
slouken@173
|
196 |
music->cvt.len = original_len;
|
slouken@0
|
197 |
}
|
slouken@173
|
198 |
if ( (music->stop - pos) < original_len ) {
|
slouken@173
|
199 |
original_len = (music->stop - pos);
|
slouken@0
|
200 |
}
|
slouken@381
|
201 |
original_len = SDL_RWread(music->rw, music->cvt.buf,1,original_len);
|
slouken@109
|
202 |
/* At least at the time of writing, SDL_ConvertAudio()
|
slouken@109
|
203 |
does byte-order swapping starting at the end of the
|
slouken@109
|
204 |
buffer. Thus, if we are reading 16-bit samples, we
|
slouken@109
|
205 |
had better make damn sure that we get an even
|
slouken@109
|
206 |
number of bytes, or we'll get garbage.
|
slouken@109
|
207 |
*/
|
slouken@173
|
208 |
if ( (music->cvt.src_format & 0x0010) && (original_len & 1) ) {
|
slouken@109
|
209 |
original_len--;
|
slouken@109
|
210 |
}
|
slouken@173
|
211 |
music->cvt.len = original_len;
|
slouken@173
|
212 |
SDL_ConvertAudio(&music->cvt);
|
slouken@214
|
213 |
SDL_MixAudio(stream, music->cvt.buf, music->cvt.len_cvt, wavestream_volume);
|
slouken@0
|
214 |
} else {
|
slouken@308
|
215 |
Uint8 *data;
|
slouken@173
|
216 |
if ( (music->stop - pos) < len ) {
|
slouken@173
|
217 |
len = (music->stop - pos);
|
slouken@0
|
218 |
}
|
slouken@308
|
219 |
data = SDL_stack_alloc(Uint8, len);
|
slouken@308
|
220 |
if (data)
|
slouken@308
|
221 |
{
|
slouken@381
|
222 |
SDL_RWread(music->rw, data, len, 1);
|
slouken@308
|
223 |
SDL_MixAudio(stream, data, len, wavestream_volume);
|
slouken@308
|
224 |
SDL_stack_free(data);
|
slouken@308
|
225 |
}
|
slouken@0
|
226 |
}
|
slouken@0
|
227 |
}
|
slouken@0
|
228 |
}
|
slouken@0
|
229 |
|
slouken@0
|
230 |
/* Stop playback of a stream previously started with WAVStream_Start() */
|
slouken@214
|
231 |
void WAVStream_Stop(void)
|
slouken@0
|
232 |
{
|
slouken@173
|
233 |
music = NULL;
|
slouken@0
|
234 |
}
|
slouken@0
|
235 |
|
slouken@0
|
236 |
/* Close the given WAV stream */
|
slouken@214
|
237 |
void WAVStream_FreeSong(WAVStream *wave)
|
slouken@0
|
238 |
{
|
slouken@0
|
239 |
if ( wave ) {
|
slouken@0
|
240 |
/* Clean up associated data */
|
slouken@381
|
241 |
if ( wave->freerw ) {
|
slouken@381
|
242 |
SDL_FreeRW(wave->rw);
|
slouken@0
|
243 |
}
|
slouken@0
|
244 |
if ( wave->cvt.buf ) {
|
slouken@0
|
245 |
free(wave->cvt.buf);
|
slouken@0
|
246 |
}
|
slouken@0
|
247 |
free(wave);
|
slouken@0
|
248 |
}
|
slouken@0
|
249 |
}
|
slouken@0
|
250 |
|
slouken@0
|
251 |
/* Return non-zero if a stream is currently playing */
|
slouken@214
|
252 |
int WAVStream_Active(void)
|
slouken@0
|
253 |
{
|
slouken@0
|
254 |
int active;
|
slouken@0
|
255 |
|
slouken@0
|
256 |
active = 0;
|
slouken@381
|
257 |
if ( music && (SDL_RWtell(music->rw) < music->stop) ) {
|
slouken@0
|
258 |
active = 1;
|
slouken@0
|
259 |
}
|
slouken@0
|
260 |
return(active);
|
slouken@0
|
261 |
}
|
slouken@0
|
262 |
|
slouken@0
|
263 |
static int ReadChunk(SDL_RWops *src, Chunk *chunk, int read_data)
|
slouken@0
|
264 |
{
|
slouken@0
|
265 |
chunk->magic = SDL_ReadLE32(src);
|
slouken@0
|
266 |
chunk->length = SDL_ReadLE32(src);
|
slouken@0
|
267 |
if ( read_data ) {
|
slouken@0
|
268 |
chunk->data = (Uint8 *)malloc(chunk->length);
|
slouken@0
|
269 |
if ( chunk->data == NULL ) {
|
slouken@134
|
270 |
Mix_SetError("Out of memory");
|
slouken@0
|
271 |
return(-1);
|
slouken@0
|
272 |
}
|
slouken@0
|
273 |
if ( SDL_RWread(src, chunk->data, chunk->length, 1) != 1 ) {
|
slouken@134
|
274 |
Mix_SetError("Couldn't read chunk");
|
slouken@0
|
275 |
free(chunk->data);
|
slouken@0
|
276 |
return(-1);
|
slouken@0
|
277 |
}
|
slouken@0
|
278 |
} else {
|
slouken@0
|
279 |
SDL_RWseek(src, chunk->length, SEEK_CUR);
|
slouken@0
|
280 |
}
|
slouken@0
|
281 |
return(chunk->length);
|
slouken@0
|
282 |
}
|
slouken@0
|
283 |
|
slouken@381
|
284 |
static SDL_RWops *LoadWAVStream (SDL_RWops *src, SDL_AudioSpec *spec,
|
slouken@0
|
285 |
long *start, long *stop)
|
slouken@0
|
286 |
{
|
slouken@0
|
287 |
int was_error;
|
slouken@0
|
288 |
Chunk chunk;
|
slouken@0
|
289 |
int lenread;
|
slouken@0
|
290 |
|
slouken@0
|
291 |
/* WAV magic header */
|
slouken@0
|
292 |
Uint32 RIFFchunk;
|
slouken@0
|
293 |
Uint32 wavelen;
|
slouken@0
|
294 |
Uint32 WAVEmagic;
|
slouken@0
|
295 |
|
slouken@0
|
296 |
/* FMT chunk */
|
slouken@0
|
297 |
WaveFMT *format = NULL;
|
slouken@0
|
298 |
|
slouken@0
|
299 |
was_error = 0;
|
slouken@29
|
300 |
|
slouken@0
|
301 |
/* Check the magic header */
|
slouken@0
|
302 |
RIFFchunk = SDL_ReadLE32(src);
|
slouken@0
|
303 |
wavelen = SDL_ReadLE32(src);
|
slouken@0
|
304 |
WAVEmagic = SDL_ReadLE32(src);
|
slouken@0
|
305 |
if ( (RIFFchunk != RIFF) || (WAVEmagic != WAVE) ) {
|
slouken@134
|
306 |
Mix_SetError("Unrecognized file type (not WAVE)");
|
slouken@0
|
307 |
was_error = 1;
|
slouken@0
|
308 |
goto done;
|
slouken@0
|
309 |
}
|
slouken@0
|
310 |
|
slouken@0
|
311 |
/* Read the audio data format chunk */
|
slouken@0
|
312 |
chunk.data = NULL;
|
slouken@0
|
313 |
do {
|
slouken@0
|
314 |
/* FIXME! Add this logic to SDL_LoadWAV_RW() */
|
slouken@0
|
315 |
if ( chunk.data ) {
|
slouken@0
|
316 |
free(chunk.data);
|
slouken@0
|
317 |
}
|
slouken@0
|
318 |
lenread = ReadChunk(src, &chunk, 1);
|
slouken@0
|
319 |
if ( lenread < 0 ) {
|
slouken@0
|
320 |
was_error = 1;
|
slouken@0
|
321 |
goto done;
|
slouken@0
|
322 |
}
|
slouken@0
|
323 |
} while ( (chunk.magic == FACT) || (chunk.magic == LIST) );
|
slouken@0
|
324 |
|
slouken@0
|
325 |
/* Decode the audio data format */
|
slouken@0
|
326 |
format = (WaveFMT *)chunk.data;
|
slouken@0
|
327 |
if ( chunk.magic != FMT ) {
|
slouken@0
|
328 |
free(chunk.data);
|
slouken@134
|
329 |
Mix_SetError("Complex WAVE files not supported");
|
slouken@0
|
330 |
was_error = 1;
|
slouken@0
|
331 |
goto done;
|
slouken@0
|
332 |
}
|
slouken@0
|
333 |
switch (SDL_SwapLE16(format->encoding)) {
|
slouken@0
|
334 |
case PCM_CODE:
|
slouken@0
|
335 |
/* We can understand this */
|
slouken@0
|
336 |
break;
|
slouken@0
|
337 |
default:
|
slouken@134
|
338 |
Mix_SetError("Unknown WAVE data format");
|
slouken@0
|
339 |
was_error = 1;
|
slouken@0
|
340 |
goto done;
|
slouken@0
|
341 |
}
|
slouken@0
|
342 |
memset(spec, 0, (sizeof *spec));
|
slouken@0
|
343 |
spec->freq = SDL_SwapLE32(format->frequency);
|
slouken@0
|
344 |
switch (SDL_SwapLE16(format->bitspersample)) {
|
slouken@0
|
345 |
case 8:
|
slouken@0
|
346 |
spec->format = AUDIO_U8;
|
slouken@0
|
347 |
break;
|
slouken@0
|
348 |
case 16:
|
slouken@0
|
349 |
spec->format = AUDIO_S16;
|
slouken@0
|
350 |
break;
|
slouken@0
|
351 |
default:
|
slouken@134
|
352 |
Mix_SetError("Unknown PCM data format");
|
slouken@0
|
353 |
was_error = 1;
|
slouken@0
|
354 |
goto done;
|
slouken@0
|
355 |
}
|
slouken@42
|
356 |
spec->channels = (Uint8) SDL_SwapLE16(format->channels);
|
slouken@0
|
357 |
spec->samples = 4096; /* Good default buffer size */
|
slouken@0
|
358 |
|
slouken@0
|
359 |
/* Set the file offset to the DATA chunk data */
|
slouken@0
|
360 |
chunk.data = NULL;
|
slouken@0
|
361 |
do {
|
slouken@0
|
362 |
*start = SDL_RWtell(src) + 2*sizeof(Uint32);
|
slouken@0
|
363 |
lenread = ReadChunk(src, &chunk, 0);
|
slouken@0
|
364 |
if ( lenread < 0 ) {
|
slouken@0
|
365 |
was_error = 1;
|
slouken@0
|
366 |
goto done;
|
slouken@0
|
367 |
}
|
slouken@0
|
368 |
} while ( chunk.magic != DATA );
|
slouken@0
|
369 |
*stop = SDL_RWtell(src);
|
slouken@0
|
370 |
|
slouken@0
|
371 |
done:
|
slouken@0
|
372 |
if ( format != NULL ) {
|
slouken@0
|
373 |
free(format);
|
slouken@0
|
374 |
}
|
slouken@381
|
375 |
if ( was_error ) {
|
slouken@381
|
376 |
return NULL;
|
slouken@0
|
377 |
}
|
slouken@381
|
378 |
return(src);
|
slouken@0
|
379 |
}
|
slouken@0
|
380 |
|
slouken@95
|
381 |
/* I couldn't get SANE_to_double() to work, so I stole this from libsndfile.
|
slouken@95
|
382 |
* I don't pretend to fully understand it.
|
slouken@95
|
383 |
*/
|
slouken@95
|
384 |
|
slouken@95
|
385 |
static Uint32 SANE_to_Uint32 (Uint8 *sanebuf)
|
slouken@0
|
386 |
{
|
slouken@95
|
387 |
/* Negative number? */
|
slouken@95
|
388 |
if (sanebuf[0] & 0x80)
|
slouken@95
|
389 |
return 0;
|
slouken@0
|
390 |
|
slouken@95
|
391 |
/* Less than 1? */
|
slouken@95
|
392 |
if (sanebuf[0] <= 0x3F)
|
slouken@95
|
393 |
return 1;
|
slouken@95
|
394 |
|
slouken@95
|
395 |
/* Way too big? */
|
slouken@95
|
396 |
if (sanebuf[0] > 0x40)
|
slouken@95
|
397 |
return 0x4000000;
|
slouken@95
|
398 |
|
slouken@95
|
399 |
/* Still too big? */
|
slouken@95
|
400 |
if (sanebuf[0] == 0x40 && sanebuf[1] > 0x1C)
|
slouken@95
|
401 |
return 800000000;
|
slouken@95
|
402 |
|
slouken@95
|
403 |
return ((sanebuf[2] << 23) | (sanebuf[3] << 15) | (sanebuf[4] << 7)
|
slouken@95
|
404 |
| (sanebuf[5] >> 1)) >> (29 - sanebuf[1]);
|
slouken@0
|
405 |
}
|
slouken@0
|
406 |
|
slouken@381
|
407 |
static SDL_RWops *LoadAIFFStream (SDL_RWops *src, SDL_AudioSpec *spec,
|
slouken@0
|
408 |
long *start, long *stop)
|
slouken@0
|
409 |
{
|
slouken@0
|
410 |
int was_error;
|
slouken@95
|
411 |
int found_SSND;
|
slouken@95
|
412 |
int found_COMM;
|
slouken@0
|
413 |
|
slouken@95
|
414 |
Uint32 chunk_type;
|
slouken@95
|
415 |
Uint32 chunk_length;
|
slouken@95
|
416 |
long next_chunk;
|
slouken@95
|
417 |
|
slouken@0
|
418 |
/* AIFF magic header */
|
slouken@0
|
419 |
Uint32 FORMchunk;
|
slouken@0
|
420 |
Uint32 AIFFmagic;
|
slouken@0
|
421 |
/* SSND chunk */
|
slouken@0
|
422 |
Uint32 offset;
|
slouken@0
|
423 |
Uint32 blocksize;
|
slouken@0
|
424 |
/* COMM format chunk */
|
slouken@142
|
425 |
Uint16 channels = 0;
|
slouken@142
|
426 |
Uint32 numsamples = 0;
|
slouken@142
|
427 |
Uint16 samplesize = 0;
|
slouken@95
|
428 |
Uint8 sane_freq[10];
|
slouken@142
|
429 |
Uint32 frequency = 0;
|
slouken@0
|
430 |
|
slouken@0
|
431 |
was_error = 0;
|
slouken@29
|
432 |
|
slouken@0
|
433 |
/* Check the magic header */
|
slouken@0
|
434 |
FORMchunk = SDL_ReadLE32(src);
|
slouken@95
|
435 |
chunk_length = SDL_ReadBE32(src);
|
slouken@0
|
436 |
AIFFmagic = SDL_ReadLE32(src);
|
slouken@0
|
437 |
if ( (FORMchunk != FORM) || (AIFFmagic != AIFF) ) {
|
slouken@134
|
438 |
Mix_SetError("Unrecognized file type (not AIFF)");
|
slouken@0
|
439 |
was_error = 1;
|
slouken@0
|
440 |
goto done;
|
slouken@0
|
441 |
}
|
slouken@0
|
442 |
|
slouken@95
|
443 |
/* From what I understand of the specification, chunks may appear in
|
slouken@95
|
444 |
* any order, and we should just ignore unknown ones.
|
slouken@109
|
445 |
*
|
slouken@109
|
446 |
* TODO: Better sanity-checking. E.g. what happens if the AIFF file
|
slouken@109
|
447 |
* contains compressed sound data?
|
slouken@95
|
448 |
*/
|
slouken@95
|
449 |
|
slouken@95
|
450 |
found_SSND = 0;
|
slouken@95
|
451 |
found_COMM = 0;
|
slouken@95
|
452 |
|
slouken@95
|
453 |
do {
|
slouken@95
|
454 |
chunk_type = SDL_ReadLE32(src);
|
slouken@95
|
455 |
chunk_length = SDL_ReadBE32(src);
|
slouken@95
|
456 |
next_chunk = SDL_RWtell(src) + chunk_length;
|
slouken@0
|
457 |
|
slouken@95
|
458 |
/* Paranoia to avoid infinite loops */
|
slouken@95
|
459 |
if (chunk_length == 0)
|
slouken@95
|
460 |
break;
|
slouken@95
|
461 |
|
slouken@95
|
462 |
switch (chunk_type) {
|
slouken@95
|
463 |
case SSND:
|
slouken@95
|
464 |
found_SSND = 1;
|
slouken@95
|
465 |
offset = SDL_ReadBE32(src);
|
slouken@95
|
466 |
blocksize = SDL_ReadBE32(src);
|
slouken@95
|
467 |
*start = SDL_RWtell(src) + offset;
|
slouken@95
|
468 |
break;
|
slouken@95
|
469 |
|
slouken@95
|
470 |
case COMM:
|
slouken@95
|
471 |
found_COMM = 1;
|
slouken@0
|
472 |
|
slouken@95
|
473 |
/* Read the audio data format chunk */
|
slouken@95
|
474 |
channels = SDL_ReadBE16(src);
|
slouken@95
|
475 |
numsamples = SDL_ReadBE32(src);
|
slouken@95
|
476 |
samplesize = SDL_ReadBE16(src);
|
slouken@95
|
477 |
SDL_RWread(src, sane_freq, sizeof(sane_freq), 1);
|
slouken@95
|
478 |
frequency = SANE_to_Uint32(sane_freq);
|
slouken@95
|
479 |
break;
|
slouken@95
|
480 |
|
slouken@95
|
481 |
default:
|
slouken@95
|
482 |
break;
|
slouken@95
|
483 |
}
|
slouken@95
|
484 |
} while ((!found_SSND || !found_COMM)
|
slouken@95
|
485 |
&& SDL_RWseek(src, next_chunk, SEEK_SET) != -1);
|
slouken@95
|
486 |
|
slouken@95
|
487 |
if (!found_SSND) {
|
slouken@134
|
488 |
Mix_SetError("Bad AIFF file (no SSND chunk)");
|
slouken@95
|
489 |
was_error = 1;
|
slouken@95
|
490 |
goto done;
|
slouken@0
|
491 |
}
|
slouken@95
|
492 |
|
slouken@95
|
493 |
if (!found_COMM) {
|
slouken@134
|
494 |
Mix_SetError("Bad AIFF file (no COMM chunk)");
|
slouken@95
|
495 |
was_error = 1;
|
slouken@95
|
496 |
goto done;
|
slouken@95
|
497 |
}
|
slouken@95
|
498 |
|
slouken@109
|
499 |
*stop = *start + channels * numsamples * (samplesize / 8);
|
slouken@0
|
500 |
|
slouken@0
|
501 |
/* Decode the audio data format */
|
slouken@0
|
502 |
memset(spec, 0, (sizeof *spec));
|
slouken@0
|
503 |
spec->freq = frequency;
|
slouken@0
|
504 |
switch (samplesize) {
|
slouken@0
|
505 |
case 8:
|
slouken@109
|
506 |
spec->format = AUDIO_S8;
|
slouken@0
|
507 |
break;
|
slouken@0
|
508 |
case 16:
|
slouken@95
|
509 |
spec->format = AUDIO_S16MSB;
|
slouken@0
|
510 |
break;
|
slouken@0
|
511 |
default:
|
slouken@134
|
512 |
Mix_SetError("Unknown samplesize in data format");
|
slouken@0
|
513 |
was_error = 1;
|
slouken@0
|
514 |
goto done;
|
slouken@0
|
515 |
}
|
slouken@42
|
516 |
spec->channels = (Uint8) channels;
|
slouken@0
|
517 |
spec->samples = 4096; /* Good default buffer size */
|
slouken@0
|
518 |
|
slouken@0
|
519 |
done:
|
slouken@381
|
520 |
if ( was_error ) {
|
slouken@381
|
521 |
return NULL;
|
slouken@0
|
522 |
}
|
slouken@381
|
523 |
return(src);
|
slouken@0
|
524 |
}
|
slouken@308
|
525 |
|