Added old abandoned version of k9copy

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/k9copy@1091546 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 347 insertions, 0 deletions

diff --git a/libdvdnav/read_cache.c b/libdvdnav/read_cache.c
new file mode 100644
index 0000000..1941c3c
--- /dev/null
+++ b/libdvdnav/read_cache.c
@@ -0,0 +1,347 @@
+/*
+ * Copyright (C) 2000 Rich Wareham <[email protected]>
+ *               2001-2004 the dvdnav project
+ *
+ * This file is part of libdvdnav, a DVD navigation library.
+ *
+ * libdvdnav 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.
+ *
+ * libdvdnav 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ * $Id: read_cache.c,v 1.12 2004/03/16 11:43:38 mroi Exp $
+ *
+ */
+/*
+ * There was a multithreaded read ahead cache in here for some time, but
+ * it had only been used for a short time. If you want to have a look at it,
+ * search the CVS attic.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "dvdnav.h"
+#include "dvdnav_internal.h"
+#include "read_cache.h"
+#include <sys/time.h>
+#include <time.h>
+#include "dvdread.h"
+#define READ_CACHE_CHUNKS 10
+
+/* all cache chunks must be memory aligned to allow use of raw devices */
+#define ALIGNMENT 2048
+
+#define READ_AHEAD_SIZE_MIN 4
+#define READ_AHEAD_SIZE_MAX 512
+
+typedef struct read_cache_chunk_s {
+  uint8_t     *cache_buffer;
+  uint8_t     *cache_buffer_base;  /* used in malloc and free for alignment */
+  int32_t      cache_start_sector; /* -1 means cache invalid */
+  int32_t      cache_read_count;   /* this many sectors are already read */
+  size_t       cache_block_count;  /* this many sectors will go in this chunk */
+  size_t       cache_malloc_size;
+  int          cache_valid;
+  int          usage_count;  /* counts how many buffers where issued from this chunk */
+} read_cache_chunk_t;
+
+struct read_cache_s {
+  read_cache_chunk_t  chunk[READ_CACHE_CHUNKS];
+  int                 current;
+  int                 freeing;  /* is set to one when we are about to dispose the cache */
+  uint32_t            read_ahead_size;
+  int                 read_ahead_incr;
+  int                 last_sector;
+  pthread_mutex_t     lock;
+
+  /* Bit of strange cross-linking going on here :) -- Gotta love C :) */
+  dvdnav_t           *dvd_self;
+};
+
+/*
+#define READ_CACHE_TRACE 0
+*/
+
+#ifdef __GNUC__
+# if READ_CACHE_TRACE
+#  define dprintf(fmt, args...) fprintf(MSG_OUT, "libdvdnav: %s: "fmt,  __func__ , ## args)
+# else
+#  define dprintf(fmt, args...) /* Nowt */
+# endif
+#else
+# if READ_CACHE_TRACE
+#  define dprintf(fmt, ...) fprintf(MSG_OUT, "libdvdnav: %s: "fmt,  __func__ , __VA_ARGS__)
+# else
+#ifdef _MSC_VER
+#  define dprintf(fmt, str) /* Nowt */
+#else
+#  define dprintf(fmt, ...) /* Nowt */
+#endif /* _MSC_VER */
+# endif
+#endif
+
+
+read_cache_t *dvdnav_read_cache_new(dvdnav_t* dvd_self) {
+  read_cache_t *self;
+  int i;
+
+  self = (read_cache_t *)malloc(sizeof(read_cache_t));
+
+  if(self) {
+    self->current = 0;
+    self->freeing = 0;
+    self->dvd_self = dvd_self;
+    self->last_sector = 0;
+    self->read_ahead_size = READ_AHEAD_SIZE_MIN;
+    self->read_ahead_incr = 0;
+    pthread_mutex_init(&self->lock, NULL);
+    dvdnav_read_cache_clear(self);
+    for (i = 0; i < READ_CACHE_CHUNKS; i++) {
+      self->chunk[i].cache_buffer = NULL;
+      self->chunk[i].usage_count = 0;
+    }
+  }
+
+  return self;
+}
+
+void dvdnav_read_cache_free(read_cache_t* self) {
+  dvdnav_t *tmp;
+  int i;
+
+  pthread_mutex_lock(&self->lock);
+  self->freeing = 1;
+  for (i = 0; i < READ_CACHE_CHUNKS; i++)
+    if (self->chunk[i].cache_buffer && self->chunk[i].usage_count == 0) {
+      free(self->chunk[i].cache_buffer_base);
+      self->chunk[i].cache_buffer = NULL;
+    }
+  pthread_mutex_unlock(&self->lock);
+
+  for (i = 0; i < READ_CACHE_CHUNKS; i++)
+    if (self->chunk[i].cache_buffer) return;
+
+  /* all buffers returned, free everything */
+  tmp = self->dvd_self;
+  pthread_mutex_destroy(&self->lock);
+  free(self);
+  free(tmp);
+}
+
+/* This function MUST be called whenever self->file changes. */
+void dvdnav_read_cache_clear(read_cache_t *self) {
+  int i;
+
+  if(!self)
+   return;
+
+  pthread_mutex_lock(&self->lock);
+  for (i = 0; i < READ_CACHE_CHUNKS; i++)
+    self->chunk[i].cache_valid = 0;
+  pthread_mutex_unlock(&self->lock);
+}
+
+/* This function is called just after reading the NAV packet. */
+void dvdnav_pre_cache_blocks(read_cache_t *self, int sector, size_t block_count) {
+  int i, use;
+
+  if(!self)
+    return;
+
+  if(!self->dvd_self->use_read_ahead)
+    return;
+
+  pthread_mutex_lock(&self->lock);
+
+  /* find a free cache chunk that best fits the required size */
+  use = -1;
+  for (i = 0; i < READ_CACHE_CHUNKS; i++)
+    if (self->chunk[i].usage_count == 0 && self->chunk[i].cache_buffer &&
+        self->chunk[i].cache_malloc_size >= block_count &&
+        (use == -1 || self->chunk[use].cache_malloc_size > self->chunk[i].cache_malloc_size))
+      use = i;
+
+  if (use == -1) {
+    /* we haven't found a cache chunk, so we try to reallocate an existing one */
+    for (i = 0; i < READ_CACHE_CHUNKS; i++)
+      if (self->chunk[i].usage_count == 0 && self->chunk[i].cache_buffer &&
+          (use == -1 || self->chunk[use].cache_malloc_size < self->chunk[i].cache_malloc_size))
+        use = i;
+    if (use >= 0) {
+      self->chunk[use].cache_buffer_base = realloc(self->chunk[use].cache_buffer_base,
+        block_count * DVD_VIDEO_LB_LEN + ALIGNMENT);
+      self->chunk[use].cache_buffer =
+        (uint8_t *)(((uintptr_t)self->chunk[use].cache_buffer_base & ~((uintptr_t)(ALIGNMENT - 1))) + ALIGNMENT);
+      dprintf("pre_cache DVD read realloc happened\n");
+      self->chunk[use].cache_malloc_size = block_count;
+    } else {
+      /* we still haven't found a cache chunk, let's allocate a new one */
+      for (i = 0; i < READ_CACHE_CHUNKS; i++)
+        if (!self->chunk[i].cache_buffer) {
+	  use = i;
+	  break;
+	}
+      if (use >= 0) {
+        /* We start with a sensible figure for the first malloc of 500 blocks.
+         * Some DVDs I have seen venture to 450 blocks.
+         * This is so that fewer realloc's happen if at all.
+         */
+	self->chunk[i].cache_buffer_base =
+	  malloc((block_count > 500 ? block_count : 500) * DVD_VIDEO_LB_LEN + ALIGNMENT);
+	self->chunk[i].cache_buffer =
+	  (uint8_t *)(((uintptr_t)self->chunk[i].cache_buffer_base & ~((uintptr_t)(ALIGNMENT - 1))) + ALIGNMENT);
+	self->chunk[i].cache_malloc_size = block_count > 500 ? block_count : 500;
+	dprintf("pre_cache DVD read malloc %d blocks\n",
+	  (block_count > 500 ? block_count : 500 ));
+      }
+    }
+  }
+
+  if (use >= 0) {
+    self->chunk[use].cache_start_sector = sector;
+    self->chunk[use].cache_block_count = block_count;
+    self->chunk[use].cache_read_count = 0;
+    self->chunk[use].cache_valid = 1;
+    self->current = use;
+  } else {
+    dprintf("pre_caching was impossible, no cache chunk available\n");
+  }
+  pthread_mutex_unlock(&self->lock);
+}
+
+int dvdnav_read_cache_block(read_cache_t *self, int sector, size_t block_count, uint8_t **buf) {
+  int i, use;
+  int start;
+  int size;
+  int incr;
+  uint8_t *read_ahead_buf;
+  int32_t res;
+
+  if(!self)
+    return 0;
+
+  use = -1;
+
+  if(self->dvd_self->use_read_ahead) {
+    /* first check, if sector is in current chunk */
+    read_cache_chunk_t cur = self->chunk[self->current];
+    if (cur.cache_valid && sector >= cur.cache_start_sector &&
+        sector <= (cur.cache_start_sector + cur.cache_read_count) &&
+        sector + block_count <= cur.cache_start_sector + cur.cache_block_count)
+      use = self->current;
+    else
+      for (i = 0; i < READ_CACHE_CHUNKS; i++)
+        if (self->chunk[i].cache_valid &&
+            sector >= self->chunk[i].cache_start_sector &&
+            sector <= (self->chunk[i].cache_start_sector + self->chunk[i].cache_read_count) &&
+            sector + block_count <= self->chunk[i].cache_start_sector + self->chunk[i].cache_block_count)
+            use = i;
+  }
+
+  if (use >= 0) {
+    read_cache_chunk_t *chunk;
+    
+    /* Increment read-ahead size if sector follows the last sector */
+    if (sector == (self->last_sector + 1)) {
+      if (self->read_ahead_incr < READ_AHEAD_SIZE_MAX)
+        self->read_ahead_incr++;
+    } else {
+      self->read_ahead_size = READ_AHEAD_SIZE_MIN;
+      self->read_ahead_incr = 0;
+    }
+    self->last_sector = sector;
+
+    /* The following resources need to be protected by a mutex :
+     *   self->chunk[*].cache_buffer
+     *   self->chunk[*].cache_malloc_size
+     *   self->chunk[*].usage_count
+     */
+    pthread_mutex_lock(&self->lock);
+    chunk = &self->chunk[use];
+    read_ahead_buf = chunk->cache_buffer + chunk->cache_read_count * DVD_VIDEO_LB_LEN;
+    *buf = chunk->cache_buffer + (sector - chunk->cache_start_sector) * DVD_VIDEO_LB_LEN;
+    chunk->usage_count++;
+    pthread_mutex_unlock(&self->lock);
+
+    dprintf("libdvdnav: sector=%d, start_sector=%d, last_sector=%d\n", sector, chunk->cache_start_sector, chunk->cache_start_sector + chunk->cache_block_count);
+
+    /* read_ahead_size */
+    incr = self->read_ahead_incr >> 1;
+    if ((self->read_ahead_size + incr) > READ_AHEAD_SIZE_MAX) {
+      self->read_ahead_size = READ_AHEAD_SIZE_MAX;
+    } else {
+      self->read_ahead_size += incr;
+    }
+
+    /* real read size */
+    start = chunk->cache_start_sector + chunk->cache_read_count;
+    if (chunk->cache_read_count + self->read_ahead_size > chunk->cache_block_count) {
+      size = chunk->cache_block_count - chunk->cache_read_count;
+    } else {
+      size = self->read_ahead_size;
+      /* ensure that the sector we want will be read */
+      if (sector >= chunk->cache_start_sector + chunk->cache_read_count + size)
+        size = sector - chunk->cache_start_sector - chunk->cache_read_count;
+    }
+    dprintf("libdvdnav: read_ahead_size=%d, size=%d\n", self->read_ahead_size, size);
+
+    if (size)
+      chunk->cache_read_count += DVDReadBlocks(self->dvd_self->file,
+                                               start,
+                                               size, 
+                                               read_ahead_buf);
+
+    res = DVD_VIDEO_LB_LEN * block_count;
+
+  } else {
+
+    if (self->dvd_self->use_read_ahead)
+      dprintf("cache miss on sector %d\n", sector);
+
+    res = DVDReadBlocks(self->dvd_self->file,
+                        sector,
+                        block_count,
+                        *buf) * DVD_VIDEO_LB_LEN;
+  }
+
+  return res;
+
+}
+
+dvdnav_status_t dvdnav_free_cache_block(dvdnav_t *self, unsigned char *buf) {
+  read_cache_t *cache;
+  int i;
+
+  if (!self)
+    return DVDNAV_STATUS_ERR;
+
+  cache = self->cache;
+  if (!cache)
+    return DVDNAV_STATUS_ERR;
+
+  pthread_mutex_lock(&cache->lock);
+  for (i = 0; i < READ_CACHE_CHUNKS; i++) {
+    if (cache->chunk[i].cache_buffer && buf >= cache->chunk[i].cache_buffer &&
+        buf < cache->chunk[i].cache_buffer + cache->chunk[i].cache_malloc_size * DVD_VIDEO_LB_LEN) {
+      cache->chunk[i].usage_count--;
+    }
+  }
+  pthread_mutex_unlock(&cache->lock);
+
+  if (cache->freeing)
+    /* when we want to dispose the cache, try freeing it now */
+    dvdnav_read_cache_free(cache);
+
+  return DVDNAV_STATUS_OK;
+}