diff options
| -rw-r--r-- | src/cachemanager.h | 97 |
1 files changed, 73 insertions, 24 deletions
diff --git a/src/cachemanager.h b/src/cachemanager.h index 6a60880..d2af6bf 100644 --- a/src/cachemanager.h +++ b/src/cachemanager.h @@ -44,42 +44,91 @@ class AudioFile; typedef int cacheid_t; + +//TODO: +// 1: Move nodata initialisation to init method. +// 2: Make semaphore in thread to block init call until thread has been started. + +//// next +// Pre: preloaded contains 2 x framesize. chunk size is framesize. +// allocate 2 chunks and copy initial_samples_needed to first buffer from +// preloaded data and enough to fill up the second buffer from preloaded +// returns the first buffer and its size in &size. +// get id from "free stack" and store pointers to buffers in id vector. +// event: open sndfile handle (if not already open) and increase refcount + +//// next +// Return which ever buffer is the front, swap them and add event to load the +// next chunk. + +//// close +// decrement file handle refcounter and close file if it is 0. +// free the 2 buffers +// (do not erase from the id vector), push index to +// "free stack" for reuse. + class CacheManager : public Thread { public: + /** + * Empty constructor... + */ CacheManager(); + + /** + * Destroy object and stop thread if needed. + */ ~CacheManager(); + /** + * Initialise cache manager and allocate needed resources + * This method starts the cache manager thread. + * This method blocks until the thread has been started. + * @param poolsize The maximum number of parellel events supported. + */ void init(size_t poolsize); - void deinit(); - - void thread_main(); - // Pre: preloaded contains 2 x framesize. chunk size is framesize. - // allocate 2 chunks and copy initial_samples_needed to first buffer from - // preloaded data and enough to fill up the second buffer from preloaded - // returns the first buffer and its size in &size. - // get id from "free stack" and store pointers to buffers in id vector. - // event: open sndfile handle (if not already open) and increase refcount - sample_t *open(AudioFile *file, size_t initial_samples_needed, int channel, cacheid_t &new_id); + /** + * Stop thread and clean up resources. + * This method blocks until the thread has stopped. + */ + void deinit(); - // Return which ever buffer is the front, swap them and add event to load the - // next chunk. + /** + * Register new cache entry. + * Prepares an entry in the cache manager for future disk streaming. + * @param file A pointer to the file which is to be streamed from. + * @param initial_samples_needed The number of samples needed in the first + * read that is not nessecarily of framesize. This is the number of samples + * from the input event offset to the end of the frame in which it resides. + * initial_samples_needed <= framesize. + * @param channel The channel to which the cache id will be bound. + * @param [out] new_id The newly created cache id. + * @return A pointer to the first buffer containing the + * 'initial_samples_needed' number of samples. + */ + sample_t *open(AudioFile *file, size_t initial_samples_needed, int channel, + cacheid_t &new_id); + + /** + * Get next buffer. + * Returns the next buffer for reading based on cache id. + * This function will (if needed) schedule a new disk read to make sure that + * data is available in the next call to this method. + * @param id The cache id to read from. + * @param [out] size The size of the returned buffer. + * @return A pointer to the buffer. + */ sample_t *next(cacheid_t id, size_t &size); - // decrement file handle refcounter and close file if it is 0. - // free the 2 buffers - // (do not erase from the id vector), push index to - // "free stack" for reuse. + /** + * Unregister cache entry. + * Close associated file handles and free associated buffers. + * @param id The cache id to close. + */ void close(cacheid_t id); - // id vector: - // { - // AudioFile* - // channel - // buffer1, buffer2 - // position - // (ready?) - // } + ///! Internal thread main method - needs to be public. + void thread_main(); private: |