common.h 3.93 KB
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/*****************************************************************************
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 * common.h: common definitions
 * (c)1998 VideoLAN
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 *****************************************************************************
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 * Collection of usefull common types and macros definitions
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 *****************************************************************************
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 * required headers:
 *  config.h
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 *****************************************************************************/
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/*****************************************************************************
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 * Basic types definitions
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 *****************************************************************************/
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#include "int_types.h"
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typedef u8                  byte_t;
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/* Boolean type */
typedef int                 boolean_t;

/* Counter for statistics and profiling */
typedef unsigned long       count_t;

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/*****************************************************************************
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 * Classes declaration
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 *****************************************************************************/
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/* Interface */
struct intf_thread_s;
struct intf_sys_s;
struct intf_console_s;
struct intf_msg_s;
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struct intf_channel_s;
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typedef struct intf_thread_s *          p_intf_thread_t;
typedef struct intf_sys_s *             p_intf_sys_t;
typedef struct intf_console_s *         p_intf_console_t;
typedef struct intf_msg_s *             p_intf_msg_t;
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typedef struct intf_channel_s *         p_intf_channel_t;
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/* Input */
struct input_thread_s;
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struct input_vlan_s;
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struct input_cfg_s;

typedef struct input_thread_s *         p_input_thread_t;
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typedef struct input_vlan_s *           p_input_vlan_t;
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typedef struct input_cfg_s *            p_input_cfg_t;

/* Audio */
struct aout_thread_s;
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struct aout_sys_s;
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typedef struct aout_thread_s *          p_aout_thread_t;
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typedef struct aout_sys_s *             p_aout_sys_t;
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/* Video */
struct vout_thread_s;
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struct vout_font_s;
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struct vout_sys_s;
struct vdec_thread_s;
struct vpar_thread_s;
struct video_parser_s;

typedef struct vout_thread_s *          p_vout_thread_t;
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typedef struct vout_font_s *            p_vout_font_t;
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typedef struct vout_sys_s *             p_vout_sys_t;
typedef struct vdec_thread_s *          p_vdec_thread_t;
typedef struct vpar_thread_s *          p_vpar_thread_t;
typedef struct video_parser_s *         p_video_parser_t;

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/*****************************************************************************
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 * Macros and inline functions
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 *****************************************************************************/
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/* CEIL: division with round to nearest greater integer */
#define CEIL(n, d)  ( ((n) / (d)) + ( ((n) % (d)) ? 1 : 0) )

/* PAD: PAD(n, d) = CEIL(n ,d) * d */
#define PAD(n, d)   ( ((n) % (d)) ? ((((n) / (d)) + 1) * (d)) : (n) )

/* MAX and MIN: self explanatory */
#define MAX(a, b)   ( ((a) > (b)) ? (a) : (b) )
#define MIN(a, b)   ( ((a) < (b)) ? (a) : (b) )

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/* MSB (big endian)/LSB (little endian) convertions - network order is always
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 * MSB, and should be used for both network communications and files. Note that
 * byte orders other than little and big endians are not supported, but only
 * the VAX seems to have such exotic properties - note that these 'functions'
 * needs <netinet/in.h> or the local equivalent. */
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/* FIXME??: hton64 should be declared as an extern inline function to avoid border
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 * effects (see byteorder.h) */
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define hton16      htons
#define hton32      htonl
#define hton64(i)   ( ((u64)(htonl((i) & 0xffffffff)) << 32) | htonl(((i) >> 32) & 0xffffffff ) )
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#define ntoh16      ntohs
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#define ntoh32      ntohl
#define ntoh64      hton64
#elif __BYTE_ORDER == __BIG_ENDIAN
#define hton16      htons
#define hton32      htonl
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#define hton64(i)   ( i )
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#define ntoh16      ntohs
#define ntoh32      ntohl
#define ntoh64(i)   ( i )
#else
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/* XXX??: cause a compilation error */
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#endif

/* Macros used by input to access the TS buffer */
#define U32_AT(p)   ( ntohl ( *( (u32 *)(p) ) ) )
#define U16_AT(p)   ( ntohs ( *( (u16 *)(p) ) ) )