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Torbj?rn Andersson - Tue Sep 11 11:22:29 PDT 2001
* Added support for loading AIFF audio chunks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,203 @@ | ||
| /* | ||
| SDL_mixer: An audio mixer library based on the SDL library | ||
| Copyright (C) 1997-2001 Sam Lantinga | ||
| This library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Library General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2 of the License, or (at your option) any later version. | ||
| This library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Library General Public License for more details. | ||
| You should have received a copy of the GNU Library General Public | ||
| License along with this library; if not, write to the Free | ||
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| This is the source needed to decode an AIFF file into a waveform. | ||
| It's pretty straightforward once you get going. The only | ||
| externally-callable function is Mix_LoadAIFF_RW(), which is meant to | ||
| act as identically to SDL_LoadWAV_RW() as possible. | ||
| This file by Torbjörn Andersson (torbjorn.andersson@eurotime.se) | ||
| */ | ||
|
|
||
| #include "SDL_mutex.h" | ||
| #include "SDL_endian.h" | ||
| #include "SDL_timer.h" | ||
|
|
||
| #include "SDL_mixer.h" | ||
| #include "load_aiff.h" | ||
|
|
||
| /*********************************************/ | ||
| /* Define values for AIFF (IFF audio) format */ | ||
| /*********************************************/ | ||
| #define FORM 0x4d524f46 /* "FORM" */ | ||
| #define AIFF 0x46464941 /* "AIFF" */ | ||
| #define SSND 0x444e5353 /* "SSND" */ | ||
| #define COMM 0x4d4d4f43 /* "COMM" */ | ||
|
|
||
| /* This function was taken from libsndfile. I don't pretend to fully | ||
| * understand it. | ||
| */ | ||
|
|
||
| static Uint32 SANE_to_Uint32 (Uint8 *sanebuf) | ||
| { | ||
| /* Is the frequency outside of what we can represent with Uint32? */ | ||
| if ( (sanebuf[0] & 0x80) || (sanebuf[0] <= 0x3F) || (sanebuf[0] > 0x40) | ||
| || (sanebuf[0] == 0x40 && sanebuf[1] > 0x1C) ) | ||
| return 0; | ||
|
|
||
| return ((sanebuf[2] << 23) | (sanebuf[3] << 15) | (sanebuf[4] << 7) | ||
| | (sanebuf[5] >> 1)) >> (29 - sanebuf[1]); | ||
| } | ||
|
|
||
| /* This function is based on SDL_LoadWAV_RW(). */ | ||
|
|
||
| SDL_AudioSpec *Mix_LoadAIFF_RW (SDL_RWops *src, int freesrc, | ||
| SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len) | ||
| { | ||
| int was_error; | ||
| int found_SSND; | ||
| int found_COMM; | ||
| long start; | ||
|
|
||
| Uint32 chunk_type; | ||
| Uint32 chunk_length; | ||
| long next_chunk; | ||
|
|
||
| /* AIFF magic header */ | ||
| Uint32 FORMchunk; | ||
| Uint32 AIFFmagic; | ||
|
|
||
| /* SSND chunk */ | ||
| Uint32 offset; | ||
| Uint32 blocksize; | ||
|
|
||
| /* COMM format chunk */ | ||
| Uint16 channels; | ||
| Uint32 numsamples; | ||
| Uint16 samplesize; | ||
| Uint8 sane_freq[10]; | ||
| Uint32 frequency; | ||
|
|
||
| /* Make sure we are passed a valid data source */ | ||
| was_error = 0; | ||
| if ( src == NULL ) { | ||
| was_error = 1; | ||
| goto done; | ||
| } | ||
|
|
||
| FORMchunk = SDL_ReadLE32(src); | ||
| chunk_length = SDL_ReadBE32(src); | ||
| if ( chunk_length == AIFF ) { /* The FORMchunk has already been read */ | ||
| AIFFmagic = chunk_length; | ||
| chunk_length = FORMchunk; | ||
| FORMchunk = FORM; | ||
| } else { | ||
| AIFFmagic = SDL_ReadLE32(src); | ||
| } | ||
| if ( (FORMchunk != FORM) || (AIFFmagic != AIFF) ) { | ||
| SDL_SetError("Unrecognized file type (not AIFF)"); | ||
| was_error = 1; | ||
| goto done; | ||
| } | ||
|
|
||
| /* TODO: Better santity-checking. */ | ||
|
|
||
| found_SSND = 0; | ||
| found_COMM = 0; | ||
|
|
||
| do { | ||
| chunk_type = SDL_ReadLE32(src); | ||
| chunk_length = SDL_ReadBE32(src); | ||
| next_chunk = SDL_RWtell(src) + chunk_length; | ||
|
|
||
| /* Paranoia to avoid infinite loops */ | ||
| if (chunk_length == 0) | ||
| break; | ||
|
|
||
| switch (chunk_type) { | ||
| case SSND: | ||
| found_SSND = 1; | ||
| offset = SDL_ReadBE32(src); | ||
| blocksize = SDL_ReadBE32(src); | ||
| start = SDL_RWtell(src) + offset; | ||
| break; | ||
|
|
||
| case COMM: | ||
| found_COMM = 1; | ||
| channels = SDL_ReadBE16(src); | ||
| numsamples = SDL_ReadBE32(src); | ||
| samplesize = SDL_ReadBE16(src); | ||
| SDL_RWread(src, sane_freq, sizeof(sane_freq), 1); | ||
| frequency = SANE_to_Uint32(sane_freq); | ||
| if (frequency == 0) { | ||
| SDL_SetError("Bad AIFF sample frequency"); | ||
| was_error = 1; | ||
| goto done; | ||
| } | ||
| break; | ||
|
|
||
| default: | ||
| break; | ||
| } | ||
| } while ( ( !found_SSND || !found_COMM ) | ||
| && SDL_RWseek(src, next_chunk, SEEK_SET) != 1 ); | ||
|
|
||
| if ( !found_SSND ) { | ||
| SDL_SetError("Bad AIFF (no SSND chunk)"); | ||
| was_error = 1; | ||
| goto done; | ||
| } | ||
|
|
||
| if ( !found_COMM ) { | ||
| SDL_SetError("Bad AIFF (no COMM chunk)"); | ||
| was_error = 1; | ||
| goto done; | ||
| } | ||
|
|
||
| /* Decode the audio data format */ | ||
| memset(spec, 0, sizeof(*spec)); | ||
| spec->freq = frequency; | ||
| switch (samplesize) { | ||
| case 8: | ||
| spec->format = AUDIO_S8; | ||
| break; | ||
| case 16: | ||
| spec->format = AUDIO_S16MSB; | ||
| break; | ||
| default: | ||
| SDL_SetError("Unsupported AIFF samplesize"); | ||
| was_error = 1; | ||
| goto done; | ||
| } | ||
| spec->channels = (Uint8) channels; | ||
| spec->samples = 4096; /* Good default buffer size */ | ||
|
|
||
| *audio_len = channels * numsamples * (samplesize / 8); | ||
| *audio_buf = (Uint8 *)malloc(*audio_len); | ||
| if ( *audio_buf == NULL ) { | ||
| SDL_SetError("Out of memory"); | ||
| return(NULL); | ||
| } | ||
| SDL_RWseek(src, start, SEEK_SET); | ||
| if ( SDL_RWread(src, *audio_buf, *audio_len, 1) != 1 ) { | ||
| SDL_SetError("Unable to read audio data"); | ||
| return(NULL); | ||
| } | ||
|
|
||
| /* Don't return a buffer that isn't a multiple of samplesize */ | ||
| *audio_len &= ~((samplesize / 8) - 1); | ||
|
|
||
| done: | ||
| if ( freesrc && src ) { | ||
| SDL_RWclose(src); | ||
| } | ||
| if ( was_error ) { | ||
| spec = NULL; | ||
| } | ||
| return(spec); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /* | ||
| SDL_mixer: An audio mixer library based on the SDL library | ||
| Copyright (C) 1997-2001 Sam Lantinga | ||
| This library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Library General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2 of the License, or (at your option) any later version. | ||
| This library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Library General Public License for more details. | ||
| You should have received a copy of the GNU Library General Public | ||
| License along with this library; if not, write to the Free | ||
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| This is the source needed to decode an AIFF file into a waveform. | ||
| It's pretty straightforward once you get going. The only | ||
| externally-callable function is Mix_LoadAIFF_RW(), which is meant to | ||
| act as identically to SDL_LoadWAV_RW() as possible. | ||
| This file by Torbjörn Andersson (torbjorn.andersson@eurotime.se) | ||
| */ | ||
|
|
||
| /* $Id$ */ | ||
|
|
||
| /* Don't call this directly; use Mix_LoadWAV_RW() for now. */ | ||
| SDL_AudioSpec *Mix_LoadAIFF_RW (SDL_RWops *src, int freesrc, | ||
| SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| /* | ||
| SDL_mixer: An audio mixer library based on the SDL library | ||
| Copyright (C) 1997-2001 Sam Lantinga | ||
| This library is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU Library General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2 of the License, or (at your option) any later version. | ||
| This library is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Library General Public License for more details. | ||
| You should have received a copy of the GNU Library General Public | ||
| License along with this library; if not, write to the Free | ||
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| This is the source needed to decode a Creative Labs VOC file into a | ||
| waveform. It's pretty straightforward once you get going. The only | ||
| externally-callable function is Mix_LoadVOC_RW(), which is meant to | ||
| act as identically to SDL_LoadWAV_RW() as possible. | ||
| This file by Ryan C. Gordon (icculus@linuxgames.com). | ||
| Heavily borrowed from sox v12.17.1's voc.c. | ||
| (http://www.freshmeat.net/projects/sox/) | ||
| */ | ||
|
|
||
| /* $Id$ */ | ||
|
|
||
| /* Don't call this directly; use Mix_LoadWAV_RW() for now. */ | ||
| SDL_AudioSpec *Mix_LoadVOC_RW (SDL_RWops *src, int freesrc, | ||
| SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len); |
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