diff options
Diffstat (limited to 'examples/common')
| -rw-r--r-- | examples/common/alhelpers.h | 4 | ||||
| -rw-r--r-- | examples/common/sdl_sound.c | 149 | ||||
| -rw-r--r-- | examples/common/sdl_sound.h | 43 |
3 files changed, 196 insertions, 0 deletions
diff --git a/examples/common/alhelpers.h b/examples/common/alhelpers.h index eda8925e..62ed5be2 100644 --- a/examples/common/alhelpers.h +++ b/examples/common/alhelpers.h @@ -9,6 +9,10 @@ #include <windows.h> #endif +#include "AL/alc.h" +#include "AL/al.h" +#include "AL/alext.h" + #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ diff --git a/examples/common/sdl_sound.c b/examples/common/sdl_sound.c new file mode 100644 index 00000000..9e9f1d62 --- /dev/null +++ b/examples/common/sdl_sound.c @@ -0,0 +1,149 @@ +/* + * SDL_sound Decoder Helpers + * + * Copyright (c) 2013 by Chris Robinson <[email protected]> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/* This file contains routines for helping to decode audio using SDL_sound. + * There's very little OpenAL-specific code here. + */ +#include "sdl_sound.h" + +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <signal.h> +#include <assert.h> + +#include <SDL_sound.h> + +#include "AL/al.h" +#include "AL/alc.h" +#include "AL/alext.h" + +#include "alhelpers.h" + + +static int done_init = 0; + +FilePtr openAudioFile(const char *fname, size_t buftime_ms) +{ + FilePtr file; + ALuint rate; + Uint32 bufsize; + ALenum chans, type; + + /* We need to make sure SDL_sound is initialized. */ + if(!done_init) + { + Sound_Init(); + done_init = 1; + } + + file = Sound_NewSampleFromFile(fname, NULL, 0); + if(!file) + { + fprintf(stderr, "Failed to open %s: %s\n", fname, Sound_GetError()); + return NULL; + } + + if(getAudioInfo(file, &rate, &chans, &type) != 0) + { + Sound_FreeSample(file); + return NULL; + } + + bufsize = FramesToBytes((ALsizei)(buftime_ms/1000.0*rate), chans, type); + if(Sound_SetBufferSize(file, bufsize) == 0) + { + fprintf(stderr, "Failed to set buffer size to %u bytes: %s\n", bufsize, Sound_GetError()); + Sound_FreeSample(file); + return NULL; + } + + return file; +} + +void closeAudioFile(FilePtr file) +{ + if(file) + Sound_FreeSample(file); +} + + +int getAudioInfo(FilePtr file, ALuint *rate, ALenum *channels, ALenum *type) +{ + if(file->actual.channels == 1) + *channels = AL_MONO_SOFT; + else if(file->actual.channels == 2) + *channels = AL_STEREO_SOFT; + else + { + fprintf(stderr, "Unsupported channel count: %d\n", file->actual.channels); + return 1; + } + + if(file->actual.format == AUDIO_U8) + *type = AL_UNSIGNED_BYTE_SOFT; + else if(file->actual.format == AUDIO_S8) + *type = AL_BYTE_SOFT; + else if(file->actual.format == AUDIO_U16SYS) + *type = AL_UNSIGNED_SHORT_SOFT; + else if(file->actual.format == AUDIO_S16SYS) + *type = AL_SHORT_SOFT; + else + { + fprintf(stderr, "Unsupported sample format: 0x%04x\n", file->actual.format); + return 1; + } + + *rate = file->actual.rate; + + return 0; +} + + +uint8_t *getAudioData(FilePtr file, size_t *length) +{ + *length = Sound_Decode(file); + if(*length == 0) + return NULL; + return file->buffer; +} + +void *decodeAudioStream(FilePtr file, size_t *length) +{ + Uint32 got; + char *mem; + + got = Sound_DecodeAll(file); + if(got == 0) + { + *length = 0; + return NULL; + } + + mem = malloc(got); + memcpy(mem, file->buffer, got); + + *length = got; + return mem; +} diff --git a/examples/common/sdl_sound.h b/examples/common/sdl_sound.h new file mode 100644 index 00000000..e93ab92b --- /dev/null +++ b/examples/common/sdl_sound.h @@ -0,0 +1,43 @@ +#ifndef EXAMPLES_SDL_SOUND_H +#define EXAMPLES_SDL_SOUND_H + +#include "AL/al.h" + +#include <SDL_sound.h> + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/* Opaque handles to files and streams. Apps don't need to concern themselves + * with the internals */ +typedef Sound_Sample *FilePtr; + +/* Opens a file with SDL_sound, and specifies the size of the sample buffer in + * milliseconds. */ +FilePtr openAudioFile(const char *fname, size_t buftime_ms); + +/* Closes/frees an opened file */ +void closeAudioFile(FilePtr file); + +/* Returns information about the given audio stream. Returns 0 on success. */ +int getAudioInfo(FilePtr file, ALuint *rate, ALenum *channels, ALenum *type); + +/* Returns a pointer to the next available chunk of decoded audio. The size (in + * bytes) of the returned data buffer is stored in 'length', and the returned + * pointer is only valid until the next call to getAudioData. */ +uint8_t *getAudioData(FilePtr file, size_t *length); + +/* Decodes all remaining data from the stream and returns a buffer containing + * the audio data, with the size stored in 'length'. The returned pointer must + * be freed with a call to free(). Note that since this decodes the whole + * stream, using it on lengthy streams (eg, music) will use a lot of memory. + * Such streams are better handled using getAudioData to keep smaller chunks in + * memory at any given time. */ +void *decodeAudioStream(FilePtr, size_t *length); + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* EXAMPLES_SDL_SOUND_H */ |