/***************************************************************************** * vlc_block.h: Data blocks management functions ***************************************************************************** * Copyright (C) 2003 the VideoLAN team * $Id: 887cd2dc57cfbfd00d1feffa84749d82048e18b6 $ * * Authors: Laurent Aimar * * This program 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. * * This program 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. *****************************************************************************/ #ifndef VLC_BLOCK_H #define VLC_BLOCK_H 1 /** * \file * This file implements functions and structures to handle blocks of data in vlc * */ /**************************************************************************** * block: **************************************************************************** * - block_sys_t is opaque and thus block_t->p_sys is PRIVATE * - i_flags may not always be set (ie could be 0, even for a key frame * it depends where you receive the buffer (before/after a packetizer * and the demux/packetizer implementations. * - i_dts/i_pts could be VLC_TS_INVALID, it means no pts/dts * - i_length: length in microseond of the packet, can be null except in the * sout where it is mandatory. * - i_rate 0 or a valid input rate, look at vlc_input.h * * - i_buffer number of valid data pointed by p_buffer * you can freely decrease it but never increase it yourself * (use block_Realloc) * - p_buffer: pointer over datas. You should never overwrite it, you can * only incremment it to skip datas, in others cases use block_Realloc * (don't duplicate yourself in a bigger buffer, block_Realloc is * optimised for prehader/postdatas increase) ****************************************************************************/ typedef struct block_sys_t block_sys_t; /** The content doesn't follow the last block, or is probably broken */ #define BLOCK_FLAG_DISCONTINUITY 0x0001 /** Intra frame */ #define BLOCK_FLAG_TYPE_I 0x0002 /** Inter frame with backward reference only */ #define BLOCK_FLAG_TYPE_P 0x0004 /** Inter frame with backward and forward reference */ #define BLOCK_FLAG_TYPE_B 0x0008 /** For inter frame when you don't know the real type */ #define BLOCK_FLAG_TYPE_PB 0x0010 /** Warn that this block is a header one */ #define BLOCK_FLAG_HEADER 0x0020 /** This is the last block of the frame */ #define BLOCK_FLAG_END_OF_FRAME 0x0040 /** This is not a key frame for bitrate shaping */ #define BLOCK_FLAG_NO_KEYFRAME 0x0080 /** This block contains the last part of a sequence */ #define BLOCK_FLAG_END_OF_SEQUENCE 0x0100 /** This block contains a clock reference */ #define BLOCK_FLAG_CLOCK 0x0200 /** This block is scrambled */ #define BLOCK_FLAG_SCRAMBLED 0x0400 /** This block has to be decoded but not be displayed */ #define BLOCK_FLAG_PREROLL 0x0800 /** This block is corrupted and/or there is data loss */ #define BLOCK_FLAG_CORRUPTED 0x1000 /** This block contains an interlaced picture with top field first */ #define BLOCK_FLAG_TOP_FIELD_FIRST 0x2000 /** This block contains an interlaced picture with bottom field first */ #define BLOCK_FLAG_BOTTOM_FIELD_FIRST 0x4000 /** This block contains an interlaced picture */ #define BLOCK_FLAG_INTERLACED_MASK \ (BLOCK_FLAG_TOP_FIELD_FIRST|BLOCK_FLAG_BOTTOM_FIELD_FIRST) #define BLOCK_FLAG_TYPE_MASK \ (BLOCK_FLAG_TYPE_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B|BLOCK_FLAG_TYPE_PB) /* These are for input core private usage only */ #define BLOCK_FLAG_CORE_PRIVATE_MASK 0x00ff0000 #define BLOCK_FLAG_CORE_PRIVATE_SHIFT 16 /* These are for module private usage only */ #define BLOCK_FLAG_PRIVATE_MASK 0xff000000 #define BLOCK_FLAG_PRIVATE_SHIFT 24 typedef void (*block_free_t) (block_t *); struct block_t { block_t *p_next; uint32_t i_flags; mtime_t i_pts; mtime_t i_dts; mtime_t i_length; unsigned i_nb_samples; /* Used for audio */ int i_rate; size_t i_buffer; uint8_t *p_buffer; /* Rudimentary support for overloading block (de)allocation. */ block_free_t pf_release; }; /**************************************************************************** * Blocks functions: **************************************************************************** * - block_Alloc : create a new block with the requested size ( >= 0 ), return * NULL for failure. * - block_Release : release a block allocated with block_Alloc. * - block_Realloc : realloc a block, * i_pre: how many bytes to insert before body if > 0, else how many * bytes of body to skip (the latter can be done without using * block_Realloc i_buffer -= -i_pre, p_buffer += -i_pre as i_pre < 0) * i_body (>= 0): the final size of the body (decreasing it can directly * be done with i_buffer = i_body). * with preheader and or body (increase * and decrease are supported). Use it as it is optimised. * - block_Duplicate : create a copy of a block. ****************************************************************************/ VLC_EXPORT( void, block_Init, ( block_t *, void *, size_t ) ); VLC_EXPORT( block_t *, block_Alloc, ( size_t ) LIBVLC_USED ); VLC_EXPORT( block_t *, block_Realloc, ( block_t *, ssize_t i_pre, size_t i_body ) LIBVLC_USED ); #define block_New( dummy, size ) block_Alloc(size) LIBVLC_USED static inline block_t *block_Duplicate( block_t *p_block ) { block_t *p_dup = block_Alloc( p_block->i_buffer ); if( p_dup == NULL ) return NULL; p_dup->i_dts = p_block->i_dts; p_dup->i_pts = p_block->i_pts; p_dup->i_flags = p_block->i_flags; p_dup->i_length = p_block->i_length; p_dup->i_rate = p_block->i_rate; p_dup->i_nb_samples = p_block->i_nb_samples; memcpy( p_dup->p_buffer, p_block->p_buffer, p_block->i_buffer ); return p_dup; } static inline void block_Release( block_t *p_block ) { p_block->pf_release( p_block ); } VLC_EXPORT( block_t *, block_heap_Alloc, (void *, void *, size_t) LIBVLC_USED ); VLC_EXPORT( block_t *, block_mmap_Alloc, (void *addr, size_t length) LIBVLC_USED ); VLC_EXPORT( block_t *, block_File, (int fd) LIBVLC_USED ); static inline void block_Cleanup (void *block) { block_Release ((block_t *)block); } #define block_cleanup_push( block ) vlc_cleanup_push (block_Cleanup, block) /**************************************************************************** * Chains of blocks functions helper **************************************************************************** * - block_ChainAppend : append a block to the last block of a chain. Try to * avoid using with a lot of data as it's really slow, prefer * block_ChainLastAppend * - block_ChainLastAppend : use a pointer over a pointer to the next blocks, * and update it. * - block_ChainRelease : release a chain of block * - block_ChainExtract : extract data from a chain, return real bytes counts * - block_ChainGather : gather a chain, free it and return one block. ****************************************************************************/ static inline void block_ChainAppend( block_t **pp_list, block_t *p_block ) { if( *pp_list == NULL ) { *pp_list = p_block; } else { block_t *p = *pp_list; while( p->p_next ) p = p->p_next; p->p_next = p_block; } } static inline void block_ChainLastAppend( block_t ***ppp_last, block_t *p_block ) { block_t *p_last = p_block; **ppp_last = p_block; while( p_last->p_next ) p_last = p_last->p_next; *ppp_last = &p_last->p_next; } static inline void block_ChainRelease( block_t *p_block ) { while( p_block ) { block_t *p_next = p_block->p_next; block_Release( p_block ); p_block = p_next; } } static size_t block_ChainExtract( block_t *p_list, void *p_data, size_t i_max ) { size_t i_total = 0; uint8_t *p = (uint8_t*)p_data; while( p_list && i_max ) { size_t i_copy = __MIN( i_max, p_list->i_buffer ); memcpy( p, p_list->p_buffer, i_copy ); i_max -= i_copy; i_total += i_copy; p += i_copy; p_list = p_list->p_next; } return i_total; } static inline void block_ChainProperties( block_t *p_list, int *pi_count, size_t *pi_size, mtime_t *pi_length ) { size_t i_size = 0; mtime_t i_length = 0; int i_count = 0; while( p_list ) { i_size += p_list->i_buffer; i_length += p_list->i_length; i_count++; p_list = p_list->p_next; } if( pi_size ) *pi_size = i_size; if( pi_length ) *pi_length = i_length; if( pi_count ) *pi_count = i_count; } static inline block_t *block_ChainGather( block_t *p_list ) { size_t i_total = 0; mtime_t i_length = 0; block_t *g; if( p_list->p_next == NULL ) return p_list; /* Already gathered */ block_ChainProperties( p_list, NULL, &i_total, &i_length ); g = block_Alloc( i_total ); block_ChainExtract( p_list, g->p_buffer, g->i_buffer ); g->i_flags = p_list->i_flags; g->i_pts = p_list->i_pts; g->i_dts = p_list->i_dts; g->i_length = i_length; /* free p_list */ block_ChainRelease( p_list ); return g; } /**************************************************************************** * Fifos of blocks. **************************************************************************** * - block_FifoNew : create and init a new fifo * - block_FifoRelease : destroy a fifo and free all blocks in it. * - block_FifoPace : wait for a fifo to drain to a specified number of packets or total data size * - block_FifoEmpty : free all blocks in a fifo * - block_FifoPut : put a block * - block_FifoGet : get a packet from the fifo (and wait if it is empty) * - block_FifoShow : show the first packet of the fifo (and wait if * needed), be carefull, you can use it ONLY if you are sure to be the * only one getting data from the fifo. * - block_FifoCount : how many packets are waiting in the fifo * - block_FifoWake : wake ups a thread with block_FifoGet() = NULL * (this is used to wakeup a thread when there is no data to queue) * * block_FifoGet and block_FifoShow are cancellation points. ****************************************************************************/ VLC_EXPORT( block_fifo_t *, block_FifoNew, ( void ) LIBVLC_USED ); VLC_EXPORT( void, block_FifoRelease, ( block_fifo_t * ) ); VLC_EXPORT( void, block_FifoPace, ( block_fifo_t *fifo, size_t max_depth, size_t max_size ) ); VLC_EXPORT( void, block_FifoEmpty, ( block_fifo_t * ) ); VLC_EXPORT( size_t, block_FifoPut, ( block_fifo_t *, block_t * ) ); VLC_EXPORT( void, block_FifoWake, ( block_fifo_t * ) ); VLC_EXPORT( block_t *, block_FifoGet, ( block_fifo_t * ) LIBVLC_USED ); VLC_EXPORT( block_t *, block_FifoShow, ( block_fifo_t * ) ); size_t block_FifoSize( const block_fifo_t *p_fifo ) LIBVLC_USED; VLC_EXPORT( size_t, block_FifoCount, ( const block_fifo_t *p_fifo ) LIBVLC_USED ); #endif /* VLC_BLOCK_H */