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Isaac Burns added support for loading MP3 files as sound chunks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| /* | ||
| SDL_mixer: An audio mixer library based on the SDL library | ||
| Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org> | ||
| This software is provided 'as-is', without any express or implied | ||
| warranty. In no event will the authors be held liable for any damages | ||
| arising from the use of this software. | ||
| Permission is granted to anyone to use this software for any purpose, | ||
| including commercial applications, and to alter it and redistribute it | ||
| freely, subject to the following restrictions: | ||
| 1. The origin of this software must not be misrepresented; you must not | ||
| claim that you wrote the original software. If you use this software | ||
| in a product, an acknowledgment in the product documentation would be | ||
| appreciated but is not required. | ||
| 2. Altered source versions must be plainly marked as such, and must not be | ||
| misrepresented as being the original software. | ||
| 3. This notice may not be removed or altered from any source distribution. | ||
| This is the source needed to decode an MP3 into a waveform. | ||
| */ | ||
|
|
||
| /* $Id$ */ | ||
|
|
||
| #if defined(MP3_MUSIC) || defined(MP3_MAD_MUSIC) | ||
|
|
||
| #include "SDL_mixer.h" | ||
|
|
||
| #include "load_mp3.h" | ||
|
|
||
| #if defined(MP3_MUSIC) | ||
| #include "dynamic_mp3.h" | ||
| #elif defined(MP3_MAD_MUSIC) | ||
| #include "music_mad.h" | ||
| #endif | ||
|
|
||
| SDL_AudioSpec *Mix_LoadMP3_RW(SDL_RWops *src, int freesrc, SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len) | ||
| { | ||
| /* note: spec is initialized to mixer spec */ | ||
|
|
||
| #if defined(MP3_MUSIC) | ||
| SMPEG* mp3; | ||
| SMPEG_Info info; | ||
| #elif defined(MP3_MAD_MUSIC) | ||
| mad_data *mp3_mad; | ||
| #endif | ||
| long samplesize; | ||
| int read_len; | ||
| const Uint32 chunk_len = 4096; | ||
| int err = 0; | ||
|
|
||
| if ((!src) || (!spec) || (!audio_buf) || (!audio_len)) | ||
| { | ||
| return NULL; | ||
| } | ||
|
|
||
| if (!err) | ||
| { | ||
| *audio_len = 0; | ||
| *audio_buf = (Uint8*) SDL_malloc(chunk_len); | ||
| err = (*audio_buf == NULL); | ||
| } | ||
|
|
||
| if (!err) | ||
| { | ||
| err = ((Mix_Init(MIX_INIT_MP3) & MIX_INIT_MP3) == 0); | ||
| } | ||
|
|
||
| if (!err) | ||
| { | ||
| #if defined(MP3_MUSIC) | ||
| mp3 = smpeg.SMPEG_new_rwops(src, &info, freesrc, 0); | ||
| err = (mp3 == NULL); | ||
| #elif defined(MP3_MAD_MUSIC) | ||
| mp3_mad = mad_openFileRW(src, spec, freesrc); | ||
| err = (mp3_mad == NULL); | ||
| #endif | ||
| } | ||
|
|
||
| #if defined(MP3_MUSIC) | ||
| if (!err) | ||
| { | ||
| err = !info.has_audio; | ||
| } | ||
| #endif | ||
|
|
||
| if (!err) | ||
| { | ||
| #if defined(MP3_MUSIC) | ||
|
|
||
| smpeg.SMPEG_actualSpec(mp3, spec); | ||
|
|
||
| smpeg.SMPEG_enableaudio(mp3, 1); | ||
| smpeg.SMPEG_enablevideo(mp3, 0); | ||
|
|
||
| smpeg.SMPEG_play(mp3); | ||
|
|
||
| /* read once for audio length */ | ||
| while ((read_len = smpeg.SMPEG_playAudio(mp3, *audio_buf, chunk_len)) > 0) | ||
| { | ||
| *audio_len += read_len; | ||
| } | ||
|
|
||
| smpeg.SMPEG_stop(mp3); | ||
|
|
||
| #elif defined(MP3_MAD_MUSIC) | ||
|
|
||
| mad_start(mp3_mad); | ||
|
|
||
| /* read once for audio length */ | ||
| while ((read_len = mad_getSamples(mp3_mad, *audio_buf, chunk_len)) > 0) | ||
| { | ||
| *audio_len += read_len; | ||
| } | ||
|
|
||
| mad_stop(mp3_mad); | ||
|
|
||
| #endif | ||
|
|
||
| err = (read_len < 0); | ||
| } | ||
|
|
||
| if (!err) | ||
| { | ||
| /* reallocate, if needed */ | ||
| if ((*audio_len > 0) && (*audio_len != chunk_len)) | ||
| { | ||
| *audio_buf = (Uint8*) SDL_realloc(*audio_buf, *audio_len); | ||
| err = (*audio_buf == NULL); | ||
| } | ||
| } | ||
|
|
||
| if (!err) | ||
| { | ||
| /* read again for audio buffer, if needed */ | ||
| if (*audio_len > chunk_len) | ||
| { | ||
| #if defined(MP3_MUSIC) | ||
| smpeg.SMPEG_rewind(mp3); | ||
| smpeg.SMPEG_play(mp3); | ||
| err = (*audio_len != smpeg.SMPEG_playAudio(mp3, *audio_buf, *audio_len)); | ||
| smpeg.SMPEG_stop(mp3); | ||
| #elif defined(MP3_MAD_MUSIC) | ||
| mad_seek(mp3_mad, 0); | ||
| mad_start(mp3_mad); | ||
| err = (*audio_len != mad_getSamples(mp3_mad, *audio_buf, *audio_len)); | ||
| mad_stop(mp3_mad); | ||
| #endif | ||
| } | ||
| } | ||
|
|
||
| if (!err) | ||
| { | ||
| /* Don't return a buffer that isn't a multiple of samplesize */ | ||
| samplesize = ((spec->format & 0xFF)/8)*spec->channels; | ||
| *audio_len &= ~(samplesize-1); | ||
| } | ||
|
|
||
| #if defined(MP3_MUSIC) | ||
| if (mp3) | ||
| { | ||
| smpeg.SMPEG_delete(mp3); mp3 = NULL; | ||
| /* Deleting the MP3 closed the source if desired */ | ||
| freesrc = SDL_FALSE; | ||
| } | ||
| #elif defined(MP3_MAD_MUSIC) | ||
| if (mp3_mad) | ||
| { | ||
| mad_closeFile(mp3_mad); mp3_mad = NULL; | ||
| /* Deleting the MP3 closed the source if desired */ | ||
| freesrc = SDL_FALSE; | ||
| } | ||
| #endif | ||
|
|
||
| if (freesrc) | ||
| { | ||
| SDL_RWclose(src); src = NULL; | ||
| } | ||
|
|
||
| /* handle error */ | ||
| if (err) | ||
| { | ||
| if (*audio_buf != NULL) | ||
| { | ||
| SDL_free(*audio_buf); *audio_buf = NULL; | ||
| } | ||
| *audio_len = 0; | ||
| spec = NULL; | ||
| } | ||
|
|
||
| return spec; | ||
| } | ||
|
|
||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| SDL_mixer: An audio mixer library based on the SDL library | ||
| Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org> | ||
| This software is provided 'as-is', without any express or implied | ||
| warranty. In no event will the authors be held liable for any damages | ||
| arising from the use of this software. | ||
| Permission is granted to anyone to use this software for any purpose, | ||
| including commercial applications, and to alter it and redistribute it | ||
| freely, subject to the following restrictions: | ||
| 1. The origin of this software must not be misrepresented; you must not | ||
| claim that you wrote the original software. If you use this software | ||
| in a product, an acknowledgment in the product documentation would be | ||
| appreciated but is not required. | ||
| 2. Altered source versions must be plainly marked as such, and must not be | ||
| misrepresented as being the original software. | ||
| 3. This notice may not be removed or altered from any source distribution. | ||
| This is the source needed to decode an MP3 into a waveform. | ||
| */ | ||
|
|
||
| /* $Id$ */ | ||
|
|
||
| #ifdef MP3_MUSIC | ||
| /* Don't call this directly; use Mix_LoadWAV_RW() for now. */ | ||
| SDL_AudioSpec *Mix_LoadMP3_RW (SDL_RWops *src, int freesrc, | ||
| SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len); | ||
| #endif |
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