From 07a2880dc8afbdbd4235f1fd7ef4df687d8f113a Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sun, 22 Aug 2004 07:55:14 +0000
Subject: [PATCH] Martin_Storsj? -  Sun, 22 Aug 2004 02:21:14 +0300 (EEST)  *
 Added SDL_RWops support for reading Ogg Vorbis files

---
 CHANGES     |  2 ++
 music.c     | 26 +++++++++++++++++++-------
 music_ogg.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 music_ogg.h |  3 +++
 4 files changed, 76 insertions(+), 7 deletions(-)

diff --git a/CHANGES b/CHANGES
index b348c05c..d13ed9d3 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,6 @@
 1.2.6:
+Martin_Storsjö -  Sun, 22 Aug 2004 02:21:14 +0300 (EEST)
+ * Added SDL_RWops support for reading Ogg Vorbis files
 Greg Lee - Wed, 14 Jul 2004 05:13:14 -1000
  * Added 4 and 6 channel surround sound output support
  * Added support for RMID format MIDI files
diff --git a/music.c b/music.c
index fa7f0bb8..dccff920 100644
--- a/music.c
+++ b/music.c
@@ -1203,19 +1203,21 @@ void close_music(void)
 #ifdef USE_RWOPS
 
 Mix_Music *Mix_LoadMUS_RW(SDL_RWops *rw) {
-	/*Uint8     magic[5]; Apparently there is no way to check if the file is really a MOD,*/
-      /*		    or there are too many formats supported by MikMod or MikMod does */
-      /*		    this check by itself. If someone implements other formats (e.g. MP3) */
-      /*		    the check can be uncommented */
+	Uint8 magic[5];	  /*Apparently there is no way to check if the file is really a MOD,*/
+	/*		    or there are too many formats supported by MikMod or MikMod does */
+	/*		    this check by itself. If someone implements other formats (e.g. MP3) */
+	/*		    the check can be uncommented */
 	Mix_Music *music;
+	int start;
 
-      /* Just skip the check */
 	/* Figure out what kind of file this is */
-	/*if (SDL_RWread(rw,magic,1,4)!=4) {
+	start = SDL_RWtell(rw);
+	if (SDL_RWread(rw,magic,1,4)!=4) {
 		Mix_SetError("Couldn't read from RWops");
 		return NULL;
 	}
-	magic[4]='\0';*/
+	SDL_RWseek(rw, start, SEEK_SET);
+	magic[4]='\0';
 
 	/* Allocate memory for the music structure */
 	music=(Mix_Music *)malloc(sizeof(Mix_Music));
@@ -1225,6 +1227,16 @@ Mix_Music *Mix_LoadMUS_RW(SDL_RWops *rw) {
 	}
 	music->error = 0;
 
+#ifdef OGG_MUSIC
+	/* Ogg Vorbis files have the magic four bytes "OggS" */
+	if ( strcmp((char *)magic, "OggS") == 0 ) {
+		music->type = MUS_OGG;
+		music->data.ogg = OGG_new_RW(rw);
+		if ( music->data.ogg == NULL ) {
+			music->error = 1;
+		}
+	} else
+#endif
 #ifdef MOD_MUSIC
 	if (1) {
 		music->type=MUS_MOD;
diff --git a/music_ogg.c b/music_ogg.c
index 7d61e745..40610733 100644
--- a/music_ogg.c
+++ b/music_ogg.c
@@ -83,6 +83,58 @@ OGG_music *OGG_new(const char *file)
 	return(music);
 }
 
+
+static size_t sdl_read_func(void *ptr, size_t size, size_t nmemb, void *datasource)
+{
+    return SDL_RWread((SDL_RWops*)datasource, ptr, size, nmemb);
+}
+
+static int sdl_seek_func(void *datasource, ogg_int64_t offset, int whence)
+{
+    return SDL_RWseek((SDL_RWops*)datasource, (int)offset, whence);
+}
+
+static int sdl_close_func(void *datasource)
+{
+    return SDL_RWclose((SDL_RWops*)datasource);
+}
+
+static long sdl_tell_func(void *datasource)
+{
+    return SDL_RWtell((SDL_RWops*)datasource);
+}
+
+/* Load an OGG stream from an SDL_RWops object */
+OGG_music *OGG_new_RW(SDL_RWops *rw)
+{
+	OGG_music *music;
+	ov_callbacks callbacks;
+
+	callbacks.read_func = sdl_read_func;
+	callbacks.seek_func = sdl_seek_func;
+	callbacks.close_func = sdl_close_func;
+	callbacks.tell_func = sdl_tell_func;
+
+	music = (OGG_music *)malloc(sizeof *music);
+	if ( music ) {
+		/* Initialize the music structure */
+		memset(music, 0, (sizeof *music));
+		OGG_stop(music);
+		OGG_setvolume(music, MIX_MAX_VOLUME);
+		music->section = -1;
+
+		if ( ov_open_callbacks(rw, &music->vf, NULL, 0, callbacks) < 0 ) {
+			SDL_SetError("Not an Ogg Vorbis audio stream");
+			free(music);
+			SDL_RWclose(rw);
+			return(NULL);
+		}
+	} else {
+		SDL_SetError("Out of memory");
+	}
+	return(music);
+}
+
 /* Start playback of a given OGG stream */
 void OGG_play(OGG_music *music)
 {
diff --git a/music_ogg.h b/music_ogg.h
index 69fa819f..988bb08f 100644
--- a/music_ogg.h
+++ b/music_ogg.h
@@ -49,6 +49,9 @@ extern void OGG_setvolume(OGG_music *music, int volume);
 /* Load an OGG stream from the given file */
 extern OGG_music *OGG_new(const char *file);
 
+/* Load an OGG stream from an SDL_RWops object */
+extern OGG_music *OGG_new_RW(SDL_RWops *rw);
+
 /* Start playback of a given OGG stream */
 extern void OGG_play(OGG_music *music);