src/buffer.cpp

   1 /*
   2  * ALURE  OpenAL utility library
   3  * Copyright (c) 2009 by Chris Robinson.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to
   7  * deal in the Software without restriction, including without limitation the
   8  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   9  * sell copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /* Title: File Loading */
  25
  26 #include "config.h"
  27
  28 #include "main.h"
  29
  30 #include <string.h>
  31
  32 #include <vector>
  33 #include <memory>
  34
  35
  36 bool load_stream(alureStream *_stream, ALuint buffer)
  37 {
  38     if(!_stream)
  39         return false;
  40
  41     std::auto_ptr<std::istream> fstream(_stream->fstream);
  42     std::auto_ptr<alureStream> stream(_stream);
  43
  44     ALenum format;
  45     ALuint freq, blockAlign;
  46
  47     if(!stream->GetFormat(&format, &freq, &blockAlign))
  48     {
  49         SetError("Could not get sample format");
  50         return false;
  51     }
  52
  53     if(format == AL_NONE)
  54     {
  55         SetError("No valid format");
  56         return false;
  57     }
  58     if(blockAlign == 0)
  59     {
  60         SetError("Invalid block size");
  61         return false;
  62     }
  63     if(freq == 0)
  64     {
  65         SetError("Invalid sample rate");
  66         return false;
  67     }
  68
  69     ALuint writePos = 0, got;
  70     std::vector<ALubyte> data(freq*blockAlign);
  71     while((got=stream->GetData(&data[writePos], data.size()-writePos)) > 0)
  72     {
  73         writePos += got;
  74         data.resize(writePos + freq*blockAlign);
  75     }
  76     data.resize(writePos - (writePos%blockAlign));
  77     stream.reset(NULL);
  78
  79     alBufferData(buffer, format, &data[0], data.size(), freq);
  80     if(alGetError() != AL_NO_ERROR)
  81     {
  82         SetError("Buffer load failed");
  83         return false;
  84     }
  85
  86     return true;
  87 }
  88
  89 extern "C" {
  90
  91 /* Function: alureCreateBufferFromFile
  92  *
  93  * Loads the given file into a new OpenAL buffer object. The formats supported
  94  * depend on the options the library was compiled with, what libraries are
  95  * available at runtime, and the installed decode callbacks. Requires an active
  96  * context.
  97  *
  98  * Returns:
  99  * A new buffer ID with the loaded sound, or AL_NONE on error.
 100  *
 101  * See Also:
 102  * <alureBufferDataFromFile>
 103  */
 104 ALURE_API ALuint ALURE_APIENTRY alureCreateBufferFromFile(const ALchar *fname)
 105 {
 106     if(alGetError() != AL_NO_ERROR)
 107     {
 108         SetError("Existing OpenAL error");
 109         return AL_NONE;
 110     }
 111
 112     ALuint buf;
 113     alGenBuffers(1, &buf);
 114     if(alGetError() != AL_NO_ERROR)
 115     {
 116         SetError("Buffer creation failed");
 117         return AL_NONE;
 118     }
 119
 120     if(alureBufferDataFromFile(fname, buf) == AL_FALSE)
 121     {
 122         alDeleteBuffers(1, &buf);
 123         alGetError();
 124         buf = AL_NONE;
 125     }
 126
 127     return buf;
 128 }
 129
 130 /* Function: alureCreateBufferFromMemory
 131  *
 132  * Loads a file image from memory into a new OpenAL buffer object, similar to
 133  * alureCreateBufferFromFile. Requires an active context.
 134  *
 135  * Returns:
 136  * A new buffer ID with the loaded sound, or AL_NONE on error.
 137  *
 138  * See Also:
 139  * <alureBufferDataFromMemory>
 140  */
 141 ALURE_API ALuint ALURE_APIENTRY alureCreateBufferFromMemory(const ALubyte *fdata, ALsizei length)
 142 {
 143     if(alGetError() != AL_NO_ERROR)
 144     {
 145         SetError("Existing OpenAL error");
 146         return AL_NONE;
 147     }
 148
 149     ALuint buf;
 150     alGenBuffers(1, &buf);
 151     if(alGetError() != AL_NO_ERROR)
 152     {
 153         SetError("Buffer creation failed");
 154         return AL_NONE;
 155     }
 156
 157     if(alureBufferDataFromMemory(fdata, length, buf) == AL_FALSE)
 158     {
 159         alDeleteBuffers(1, &buf);
 160         alGetError();
 161         buf = AL_NONE;
 162     }
 163
 164     return buf;
 165 }
 166
 167 /* Function: alureBufferDataFromFile
 168  *
 169  * Loads the given file into an existing OpenAL buffer object. The previous
 170  * contents of the buffer are replaced. Requires an active context.
 171  *
 172  * Returns:
 173  * AL_FALSE on error.
 174  *
 175  * See Also:
 176  * <alureCreateBufferFromFile>
 177  */
 178 ALURE_API ALboolean ALURE_APIENTRY alureBufferDataFromFile(const ALchar *fname, ALuint buffer)
 179 {
 180     if(alGetError() != AL_NO_ERROR)
 181     {
 182         SetError("Existing OpenAL error");
 183         return AL_FALSE;
 184     }
 185
 186     if(load_stream(create_stream(fname), buffer) == false)
 187         return AL_FALSE;
 188     return AL_TRUE;
 189 }
 190
 191 /* Function: alureBufferDataFromMemory
 192  *
 193  * Loads a file image from memory into an existing OpenAL buffer object,
 194  * similar to alureBufferDataFromFile. Requires an active context.
 195  *
 196  * Returns:
 197  * AL_FALSE on error.
 198  *
 199  * See Also:
 200  * <alureCreateBufferFromMemory>
 201  */
 202 ALURE_API ALboolean ALURE_APIENTRY alureBufferDataFromMemory(const ALubyte *fdata, ALsizei length, ALuint buffer)
 203 {
 204     if(alGetError() != AL_NO_ERROR)
 205     {
 206         SetError("Existing OpenAL error");
 207         return AL_FALSE;
 208     }
 209
 210     if(length < 0)
 211     {
 212         SetError("Invalid data length");
 213         return AL_FALSE;
 214     }
 215
 216     MemDataInfo memData;
 217     memData.Data = fdata;
 218     memData.Length = length;
 219     memData.Pos = 0;
 220
 221     if(load_stream(create_stream(memData), buffer) == false)
 222         return AL_FALSE;
 223     return AL_TRUE;
 224 }
 225
 226 } // extern "C"