playtree.c

自己移植的linux下的流媒体播放器原代码,支持mms协议,支持ftp和http协议.

      return NULL;
  }
  iter->root = pt;
  iter->tree = NULL;
  iter->config = config;
 
  if(pt->parent)
    iter->loop = pt->parent->loop;

  return iter;
}

void
play_tree_iter_free(play_tree_iter_t* iter) {

#ifdef MP_DEBUG
  assert(iter != NULL);
#endif

  if(iter->status_stack) {
#ifdef MP_DEBUG
    assert(iter->stack_size > 0);
#endif
    free(iter->status_stack);
  }

  free(iter);
}

static play_tree_t*
play_tree_rnd_step(play_tree_t* pt) {
  int count = 0;
  int r;
  play_tree_t *i,*head;

  // Count how many free choice we have
  for(i = pt ; i->prev ; i = i->prev)
    if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
  head = i;
  if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
  for(i = pt->next ; i ; i = i->next)
    if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;

  if(!count) return NULL;
  
  r = (int)((float)(count) * rand() / (RAND_MAX + 1.0));

  for(i = head ; i  ; i=i->next) {
    if(!(i->flags & PLAY_TREE_RND_PLAYED)) r--;
    if(r < 0) return i;
  }

  mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Random stepping error\n");
  return NULL;
}


int
play_tree_iter_step(play_tree_iter_t* iter, int d,int with_nodes) {
  play_tree_t* pt;

  if ( !iter ) return PLAY_TREE_ITER_ENTRY;
  if ( !iter->root ) return PLAY_TREE_ITER_ENTRY;
  
#ifdef MP_DEBUG
  assert(iter != NULL);
  assert(iter->root != NULL);
  //printf("PT : Stepping = %d\n",d);
#endif

  if(iter->tree == NULL) {
    iter->tree = iter->root;
    return play_tree_iter_step(iter,0,with_nodes);
  }

  if(iter->config && iter->entry_pushed > 0) {
    iter->entry_pushed = 0;
    m_config_pop(iter->config);
  }

  if(iter->tree->parent && (iter->tree->parent->flags & PLAY_TREE_RND))
    iter->mode = PLAY_TREE_ITER_RND;
  else
    iter->mode = PLAY_TREE_ITER_NORMAL;

  iter->file = -1;
  if(iter->mode == PLAY_TREE_ITER_RND)
    pt = play_tree_rnd_step(iter->tree);
  else if( d > 0 ) {
    int i;
    pt = iter->tree;
    for(i = d ; i > 0 && pt ; i--)
      pt = pt->next;
    d = i ? i : 1;
  } else if(d < 0) {
    int i;
    pt = iter->tree;
    for(i = d ; i < 0 && pt ; i++)
      pt = pt->prev;
    d = i ? i : -1;
  } else
    pt = iter->tree;
  
  if(pt == NULL) { // No next
    // Must we loop?
    if (iter->mode == PLAY_TREE_ITER_RND) {
      if (iter->root->loop == 0)
        return PLAY_TREE_ITER_END;
      play_tree_unset_flag(iter->root, PLAY_TREE_RND_PLAYED, -1);
      if (iter->root->loop > 0) iter->root->loop--;
      // try again
      return play_tree_iter_step(iter, 0, with_nodes);
    } else
    if(iter->tree->parent && iter->tree->parent->loop != 0 && ((d > 0 && iter->loop != 0) || ( d < 0 && (iter->loop < 0 || iter->loop < iter->tree->parent->loop) ) ) ) { 
      if(d > 0) { // Go back to the first one
	for(pt = iter->tree ; pt->prev != NULL; pt = pt->prev)
	  /* NOTHNG */;
	if(iter->loop > 0) iter->loop--;
      } else if( d < 0 ) { // Or the last one
	for(pt = iter->tree ; pt->next != NULL; pt = pt->next)
	  /* NOTHNG */;
	if(iter->loop >= 0 && iter->loop < iter->tree->parent->loop) iter->loop++;
      }
      iter->tree = pt;
      return play_tree_iter_step(iter,0,with_nodes);
    }
    // Go up one level
    return play_tree_iter_up_step(iter,d,with_nodes);

  }

  // Is there any valid childs ?
  if(pt->child && play_tree_is_valid(pt->child)) {
    iter->tree = pt;
    if(with_nodes) { // Stop on the node      
      return PLAY_TREE_ITER_NODE;
    } else      // Or follow it
      return play_tree_iter_down_step(iter,d,with_nodes);
  }

  // Is it a valid enty ?
  if(! play_tree_is_valid(pt)) {
    if(d == 0) { // Can this happen ? FF: Yes!
      mp_msg(MSGT_PLAYTREE,MSGL_ERR,"What to do now ???? Infinite loop if we continue\n");
      return PLAY_TREE_ITER_ERROR;
    } // Not a valid entry : go to next one
    return play_tree_iter_step(iter,d,with_nodes);
  }

#ifdef MP_DEBUG
  assert(pt->files != NULL);
#endif

  iter->tree = pt;
    
  for(d = 0 ; iter->tree->files[d] != NULL ; d++)
    /* NOTHING */;
  iter->num_files = d;

  if(iter->config) {
    play_tree_iter_push_params(iter);
    iter->entry_pushed = 1;
    if(iter->mode == PLAY_TREE_ITER_RND)
      pt->flags |= PLAY_TREE_RND_PLAYED;
  }

  return PLAY_TREE_ITER_ENTRY;

}

static int
play_tree_is_valid(play_tree_t* pt) {
  play_tree_t* iter;

#ifdef MP_DEBUG
  assert(pt != NULL);
#endif

  if(pt->entry_type != PLAY_TREE_ENTRY_NODE) {
#ifdef MP_DEBUG
    assert(pt->child == NULL);
#endif
    return 1;
  }
  else if (pt->child != NULL) {
    for(iter = pt->child ; iter != NULL ; iter = iter->next) {
      if(play_tree_is_valid(iter))
	return 1;
    }
  }
  return 0;
}

int
play_tree_iter_up_step(play_tree_iter_t* iter, int d,int with_nodes) {

#ifdef MP_DEBUG
  assert(iter != NULL);
  assert(iter->tree != NULL);
  //printf("PT : Go UP\n");
#endif
  
  iter->file = -1;
  if(iter->tree->parent == iter->root->parent)
    return PLAY_TREE_ITER_END;

#ifdef MP_DEBUG
  assert(iter->tree->parent != NULL);
  assert(iter->stack_size > 0);
  assert(iter->status_stack != NULL);
#endif

  iter->stack_size--;
  iter->loop = iter->status_stack[iter->stack_size];
  if(iter->stack_size > 0)
    iter->status_stack = (int*)realloc(iter->status_stack,iter->stack_size*sizeof(int));
  else {
    free(iter->status_stack);
    iter->status_stack = NULL;
  }
  if(iter->stack_size > 0 && iter->status_stack == NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*sizeof(char*));
    return PLAY_TREE_ITER_ERROR;
  }
  iter->tree = iter->tree->parent;

  // Pop subtree params
  if(iter->config) {
    m_config_pop(iter->config);
    if(iter->mode == PLAY_TREE_ITER_RND)
      iter->tree->flags |= PLAY_TREE_RND_PLAYED;
  }

  return play_tree_iter_step(iter,d,with_nodes);
}
  
int
play_tree_iter_down_step(play_tree_iter_t* iter, int d,int with_nodes) {

#ifdef MP_DEBUG
  assert(iter->tree->files == NULL);
  assert(iter->tree->child != NULL);
  assert(iter->tree->child->parent == iter->tree);
  //printf("PT : Go DOWN\n");
#endif

  iter->file = -1;

  //  Push subtree params
  if(iter->config)
    play_tree_iter_push_params(iter);

  iter->stack_size++;
  iter->status_stack = (int*)realloc(iter->status_stack,iter->stack_size*sizeof(int));
  if(iter->status_stack == NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*sizeof(int));
    return PLAY_TREE_ITER_ERROR;
  }
  iter->status_stack[iter->stack_size-1] = iter->loop;
  // Set new status
  iter->loop = iter->tree->loop-1;
  if(d >= 0)
    iter->tree = iter->tree->child;
  else {
    play_tree_t* pt;
    for(pt = iter->tree->child ; pt->next != NULL ; pt = pt->next)
      /*NOTING*/;
    iter->tree = pt;
  }

  return play_tree_iter_step(iter,0,with_nodes);
}

char*
play_tree_iter_get_file(play_tree_iter_t* iter, int d) {
  char* entry;
#ifdef MP_DEBUG
  assert(iter != NULL);
  assert(iter->tree->child == NULL);
#endif

  if(iter->tree->files == NULL)
    return NULL;

#ifdef MP_DEBUG
  assert(iter->num_files > 0);
#endif

  if(iter->file >= iter->num_files-1 || iter->file < -1)
    return NULL;

  if(d > 0) {
    if(iter->file >= iter->num_files - 1)
      iter->file = 0;
    else
      iter->file++;
  } else if(d < 0) {
    if(iter->file <= 0)
      iter->file = iter->num_files - 1;
    else
      iter->file--;
  }
  return iter->tree->files[iter->file];
}

play_tree_t*
play_tree_cleanup(play_tree_t* pt) {
  play_tree_t* iter, *tmp, *first;

#ifdef MP_DEBUG
  assert(pt != NULL);
#endif

  if( ! play_tree_is_valid(pt)) {
    play_tree_remove(pt,1,1);
    return NULL;
  }

  first = pt->child;

  for(iter = pt->child ; iter != NULL ; ) {
    tmp = iter;
    iter = iter->next;
    if(! play_tree_is_valid(tmp)) {
      play_tree_remove(tmp,1,1);
      if(tmp == first) first = iter;
    }
  }

  for(iter = first ; iter != NULL ; ) {
    tmp = iter;
    iter = iter->next;
    play_tree_cleanup(tmp);
  }
    
  return pt;

}

play_tree_iter_t*
play_tree_iter_new_copy(play_tree_iter_t* old) {
  play_tree_iter_t* iter;

#ifdef MP_DEBUG
  assert(old != NULL);
#endif

  iter = (play_tree_iter_t*)malloc(sizeof(play_tree_iter_t));
  if(iter == NULL) {
    mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",sizeof(play_tree_iter_t));
    return NULL;
  }
;
  memcpy(iter,old,sizeof(play_tree_iter_t));
  if(old->status_stack) {
    iter->status_stack = (int*)malloc(old->stack_size * sizeof(int));
    if(iter->status_stack == NULL) {
      mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",old->stack_size * sizeof(int));
      free(iter);
      return NULL;
    }
    memcpy(iter->status_stack,old->status_stack,iter->stack_size*sizeof(int));
  }
  iter->config = NULL;

  return iter;
}

// HIGH Level API, by Fabian Franz ([e-mail])
//
play_tree_iter_t* pt_iter_create(play_tree_t** ppt, m_config_t* config)
{
  play_tree_iter_t* r=NULL;
#ifdef MP_DEBUG
  assert(*ppt!=NULL);
#endif
  
  *ppt=play_tree_cleanup(*ppt);
  
  if(*ppt) {
    r = play_tree_iter_new(*ppt,config);
    if (r && play_tree_iter_step(r,0,0) != PLAY_TREE_ITER_ENTRY) 
    {
      play_tree_iter_free(r);
      r = NULL;
    }
  }

  return r;
}

void pt_iter_destroy(play_tree_iter_t** iter)
{
  if (iter && *iter)
  {
    free(*iter);
    iter=NULL;
  }
}

char* pt_iter_get_file(play_tree_iter_t* iter, int d)
{
  int i=0;
  char* r;

  if (iter==NULL)
    return NULL;
  
  r = play_tree_iter_get_file(iter,d);
  
  while (!r && d!=0)
  {
    if (play_tree_iter_step(iter,d,0) != PLAY_TREE_ITER_ENTRY)
        break;
    r=play_tree_iter_get_file(iter,d);
    i++;
  }

  return r;
}

void pt_iter_insert_entry(play_tree_iter_t* iter, play_tree_t* entry)
{
  play_tree_t *pt = iter->tree;
#ifdef MP_DEBUG
  assert(pt!=NULL);
  assert(entry!=NULL);
  assert(entry!=pt);
#endif

  play_tree_insert_entry(pt, entry);
  play_tree_set_params_from(entry,pt);
}

void pt_iter_replace_entry(play_tree_iter_t* iter, play_tree_t* entry)
{
  play_tree_t *pt = iter->tree;

  pt_iter_insert_entry(iter, entry);
  play_tree_remove(pt, 1, 1);
  iter->tree=entry;
}

//Add a new file as a new entry
void pt_add_file(play_tree_t** ppt, char* filename)
{
  play_tree_t *pt = *ppt, *entry = play_tree_new();
#ifdef MP_DEBUG
  assert(entry!=NULL);
#endif
 
  play_tree_add_file(entry, filename);
  if (pt)
    play_tree_append_entry(pt, entry);
  else
  {
    pt=entry;
    *ppt=pt;
  }
  play_tree_set_params_from(entry,pt);
}

void pt_add_gui_file(play_tree_t** ppt, char* path, char* file)
{
  char* wholename = malloc(strlen(path)+strlen(file)+2);

  if (wholename)
  {
    strcpy(wholename, path);
    strcat(wholename, "/");
    strcat(wholename, file);
    pt_add_file(ppt, wholename);
    free(wholename); // As pt_add_file strdups it anyway!
  }
}

void pt_iter_goto_head(play_tree_iter_t* iter)
{
  iter->tree=iter->root;
  play_tree_iter_step(iter, 0, 0);
}