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3e3c43c747
buffering.c and buffering.h implement the new buffering API. playback.c is translated to that API. For more information about the whole concept, see http://www.rockbox.org/wiki/MetadataOnBuffer. There should be no major visible changes, but most existing bugs remain (though fixing them should be easier now that playback.c is a bit less complex) and there probably will be new ones. Please report any problem! Next step is to adapt cuesheet support, which is partly disabled here, and of course fix as much bugs as possible. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15306 a1c6a512-1295-4272-9138-f99709370657
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 Nicolas Pennequin
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _BUFFERING_H_
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#define _BUFFERING_H_
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#include <sys/types.h>
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#include <stdbool.h>
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enum data_type {
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TYPE_CODEC,
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TYPE_AUDIO,
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TYPE_STREAM,
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TYPE_ID3,
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TYPE_CUESHEET,
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TYPE_IMAGE,
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TYPE_BUFFER,
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TYPE_UNKNOWN,
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};
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/* Initialise the buffering subsystem */
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bool buffering_init(char *buf, size_t buflen);
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/***************************************************************************
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* MAIN BUFFERING API CALLS
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* ========================
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*
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* bufopen : Reserve space in the buffer for a given file
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* bufalloc : Open a new handle from data that needs to be copied from memory
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* bufclose : Close an open handle
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* bufseek : Set handle reading index, relatively to the start of the file
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* bufadvance: Move handle reading index, relatively to current position
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* bufread : Copy data from a handle to a buffer
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* bufgetdata: Obtain a pointer for linear access to a "size" amount of data
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****************************************************************************/
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int bufopen(const char *file, size_t offset, enum data_type type);
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int bufalloc(const void *src, size_t size, enum data_type type);
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bool bufclose(int handle_id);
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int bufseek(int handle_id, size_t newpos);
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int bufadvance(int handle_id, off_t offset);
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ssize_t bufread(int handle_id, size_t size, void *dest);
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ssize_t bufgetdata(int handle_id, size_t size, void **data);
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/***************************************************************************
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* SECONDARY FUNCTIONS
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* ===================
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*
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* buf_get_offset: Get a handle offset from a pointer
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* buf_handle_offset: Get the offset of the first buffered byte from the file
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* buf_request_buffer_handle: Request buffering of a handle
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* buf_set_base_handle: Tell the buffering thread which handle is currently read
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* buf_used: Total amount of buffer space used (including allocated space)
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****************************************************************************/
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ssize_t buf_get_offset(int handle_id, void *ptr);
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ssize_t buf_handle_offset(int handle_id);
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void buf_request_buffer_handle(int handle_id);
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void buf_set_base_handle(int handle_id);
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size_t buf_used(void);
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/***************************************************************************
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* CALLBACK UTILITIES
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* ==================
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*
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* register_buffer_low_callback, unregister_buffer_low_callback:
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*
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* Register/Unregister callback functions that will get executed when the buffer
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* goes below the low watermark. They are executed once, then forgotten.
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*
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* NOTE: The callbacks are called from the buffering thread, so don't make them
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* do too much. Ideally they should just post an event to a queue and return.
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****************************************************************************/
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#define MAX_BUF_CALLBACKS 4
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typedef void (*buffer_low_callback)(void);
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bool register_buffer_low_callback(buffer_low_callback func);
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void unregister_buffer_low_callback(buffer_low_callback func);
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/* Settings */
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enum {
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BUFFERING_SET_WATERMARK = 1,
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BUFFERING_SET_CHUNKSIZE,
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BUFFERING_SET_PRESEEK,
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};
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void buf_set_conf(int setting, size_t value);
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/* Debugging */
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struct buffering_debug {
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int num_handles;
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size_t buffered_data;
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size_t wasted_space;
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size_t data_rem;
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size_t useful_data;
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};
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void buffering_get_debugdata(struct buffering_debug *dbgdata);
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#endif
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