1 files changed, 160 insertions, 0 deletions
diff --git a/include/xine/spu_decoder.h b/include/xine/spu_decoder.h
new file mode 100644
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+++ b/include/xine/spu_decoder.h
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+/*
+ * spu_decoder_api.h
+ *
+ * Copyright (C) James Courtier-Dutton James@superbug.demon.co.uk - July 2001
+ *
+ * This file is part of xine, a unix video player.
+ * 
+ * xine is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * xine 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Make; see the file COPYING. If not, write to
+ * the Free Software Foundation, 
+ *
+ */
+
+#ifndef HAVE_SPU_API_H
+#define HAVE_SPU_API_H
+
+#include <xine/os_types.h>
+#include <xine/buffer.h>
+
+#ifdef XINE_COMPILE
+#  include <xine/plugin_catalog.h>
+#endif
+
+#define SPU_DECODER_IFACE_VERSION 17
+
+/*
+ * generic xine spu decoder plugin interface
+ */
+
+typedef struct spu_decoder_class_s spu_decoder_class_t;
+typedef struct spu_decoder_s spu_decoder_t;
+
+struct spu_decoder_class_s {
+
+  /*
+   * open a new instance of this plugin class
+   */
+  spu_decoder_t* (*open_plugin) (spu_decoder_class_t *this, xine_stream_t *stream);
+  
+  /**
+   * @brief short human readable identifier for this plugin class
+   */
+  const char *identifier;
+
+  /**
+   * @brief human readable (verbose = 1 line) description for this plugin class
+   *
+   * The description is passed to gettext() to internationalise.
+   */
+  const char *description;
+
+  /**
+   * @brief Optional non-standard catalog to use with dgettext() for description.
+   */
+  const char *text_domain;
+  
+  /*
+   * free all class-related resources
+   */
+  void (*dispose) (spu_decoder_class_t *this);
+};
+
+#define default_spu_decoder_class_dispose (void (*) (spu_decoder_class_t *this))free
+ 
+struct spu_decoder_s {
+
+  /*
+   * decode data from buf and feed the overlay to overlay manager
+   */  
+  void (*decode_data) (spu_decoder_t *this, buf_element_t *buf);
+
+  /*
+   * reset decoder after engine flush (prepare for new
+   * SPU data not related to recently decoded data)
+   */
+  void (*reset) (spu_decoder_t *this);
+    
+  /*
+   * inform decoder that a time reference discontinuity has happened.
+   * that is, it must forget any currently held pts value
+   */
+  void (*discontinuity) (spu_decoder_t *this);
+
+  /*
+   * close down, free all resources
+   */
+  void (*dispose) (spu_decoder_t *this);
+
+  /*
+   * When the SPU decoder also handles data used in user interaction,
+   * you can query the related information here. The typical example
+   * for this is DVD NAV packets which are handled by the SPU decoder
+   * and can be received readily parsed from here.
+   * The caller and the decoder must agree on the structure which is
+   * passed here.
+   * This function pointer may be NULL, if the plugin does not have
+   * such functionality.
+   */
+  int  (*get_interact_info) (spu_decoder_t *this, void *data);
+
+  /*
+   * When the SPU decoder also handles menu overlays for user inter-
+   * action, you can set a menu button here. The typical example for
+   * this is DVD menus.
+   * This function pointer may be NULL, if the plugin does not have
+   * such functionality.
+   */
+  void (*set_button) (spu_decoder_t *this_gen, int32_t button, int32_t mode);
+
+  /**
+   * @brief Pointer to the loaded plugin node.
+   *
+   * Used by the plugins loader. It's an opaque type when using the
+   * structure outside of xine's build.
+   */
+#ifdef XINE_COMPILE
+  plugin_node_t *node;
+#else
+  void *node;
+#endif
+};
+
+
+/* SPU decoders differ from video and audio decoders in one significant
+ * way: unlike audio and video, SPU streams are not continuous;
+ * this results in another difference, programmers have to consider:
+ * while both audio and video decoders are automatically blocked in
+ * their get_buffer()/get_frame() methods when the output cannot take
+ * any more data, this does not work for SPU, because it could take
+ * minutes before the next free slot becomes available and we must not
+ * block the decoder thread for that long;
+ * therefore, we provide a convenience function for SPU decoders which
+ * implements a wait until a timestamp sufficiently close to the VPTS
+ * of the next SPU is reached, but the waiting will end before that,
+ * if some outside condition requires us to release the decoder thread
+ * to other tasks;
+ * if this functions returns with 1, noone needs the decoder thread and
+ * you may continue waiting; if it returns 0, finish whatever you are
+ * doing and return;
+ * the usual pattern for SPU decoders is this:
+ *
+ * do {
+ *   spu = prepare_spu();
+ *   int thread_vacant = _x_spu_decoder_sleep(this->stream, spu->vpts);
+ *   int success = process_spu(spu);
+ * } while (!success && thread_vacant);
+ */
+int _x_spu_decoder_sleep(xine_stream_t *, int64_t next_spu_vpts) XINE_PROTECTED;
+
+#endif /* HAVE_SPUDEC_H */