vlc_input.h

/*****************************************************************************
 * vlc_input.h: Core input structures
 *****************************************************************************
 * Copyright (C) 1999-2015 VLC authors and VideoLAN
 * $Id$
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *          Laurent Aimar <fenrir@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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_INPUT_H
#define VLC_INPUT_H 1

/**
 * \defgroup input Input
 * Input thread
 * @{
 * \file
 * Input thread interface
 */

#include <vlc_es.h>
#include <vlc_meta.h>
#include <vlc_epg.h>
#include <vlc_events.h>
#include <vlc_input_item.h>
#include <vlc_vout_osd.h>

#include <string.h>

/*****************************************************************************
 * Seek point: (generalisation of chapters)
 *****************************************************************************/
struct seekpoint_t
{
    int64_t i_time_offset;
    char    *psz_name;
};

static inline seekpoint_t *vlc_seekpoint_New( void )
{
    seekpoint_t *point = (seekpoint_t*)malloc( sizeof( seekpoint_t ) );
    if( !point )
        return NULL;
    point->i_time_offset = -1;
    point->psz_name = NULL;
    return point;
}

static inline void vlc_seekpoint_Delete( seekpoint_t *point )
{
    if( !point ) return;
    free( point->psz_name );
    free( point );
}

static inline seekpoint_t *vlc_seekpoint_Duplicate( const seekpoint_t *src )
{
    seekpoint_t *point = vlc_seekpoint_New();
    if( likely(point) )
    {
        if( src->psz_name ) point->psz_name = strdup( src->psz_name );
        point->i_time_offset = src->i_time_offset;
    }
    return point;
}

/*****************************************************************************
 * Title:
 *****************************************************************************/

/* input_title_t.i_flags field */
#define INPUT_TITLE_MENU         0x01   /* Menu title */
#define INPUT_TITLE_INTERACTIVE  0x02   /* Interactive title. Playback position has no meaning. */

typedef struct input_title_t
{
    char        *psz_name;

    int64_t     i_length;   /* Length(microsecond) if known, else 0 */

    unsigned    i_flags;    /* Is it a menu or a normal entry */

    /* Title seekpoint */
    int         i_seekpoint;
    seekpoint_t **seekpoint;
} input_title_t;

static inline input_title_t *vlc_input_title_New(void)
{
    input_title_t *t = (input_title_t*)malloc( sizeof( input_title_t ) );
    if( !t )
        return NULL;

    t->psz_name = NULL;
    t->i_flags = 0;
    t->i_length = 0;
    t->i_seekpoint = 0;
    t->seekpoint = NULL;

    return t;
}

static inline void vlc_input_title_Delete( input_title_t *t )
{
    int i;
    if( t == NULL )
        return;

    free( t->psz_name );
    for( i = 0; i < t->i_seekpoint; i++ )
        vlc_seekpoint_Delete( t->seekpoint[i] );
    free( t->seekpoint );
    free( t );
}

static inline input_title_t *vlc_input_title_Duplicate( const input_title_t *t )
{
    input_title_t *dup = vlc_input_title_New( );
    if( dup == NULL) return NULL;

    if( t->psz_name ) dup->psz_name = strdup( t->psz_name );
    dup->i_flags     = t->i_flags;
    dup->i_length    = t->i_length;
    if( t->i_seekpoint > 0 )
    {
        dup->seekpoint = (seekpoint_t**)malloc( t->i_seekpoint * sizeof(seekpoint_t*) );
        if( likely(dup->seekpoint) )
        {
            for( int i = 0; i < t->i_seekpoint; i++ )
                dup->seekpoint[i] = vlc_seekpoint_Duplicate( t->seekpoint[i] );
            dup->i_seekpoint = t->i_seekpoint;
        }
    }

    return dup;
}

/*****************************************************************************
 * Attachments
 *****************************************************************************/
struct input_attachment_t
{
    char *psz_name;
    char *psz_mime;
    char *psz_description;

    size_t i_data;
    void *p_data;
};

static inline void vlc_input_attachment_Delete( input_attachment_t *a )
{
    if( !a )
        return;

    free( a->p_data );
    free( a->psz_description );
    free( a->psz_mime );
    free( a->psz_name );
    free( a );
}

static inline input_attachment_t *vlc_input_attachment_New( const char *psz_name,
                                                            const char *psz_mime,
                                                            const char *psz_description,
                                                            const void *p_data,
                                                            size_t i_data )
{
    input_attachment_t *a = (input_attachment_t *)malloc( sizeof (*a) );
    if( unlikely(a == NULL) )
        return NULL;

    a->psz_name = strdup( psz_name ? psz_name : "" );
    a->psz_mime = strdup( psz_mime ? psz_mime : "" );
    a->psz_description = strdup( psz_description ? psz_description : "" );
    a->i_data = i_data;
    a->p_data = malloc( i_data );
    if( i_data > 0 && likely(a->p_data != NULL) )
        memcpy( a->p_data, p_data, i_data );

    if( unlikely(a->psz_name == NULL || a->psz_mime == NULL
              || a->psz_description == NULL || (i_data > 0 && a->p_data == NULL)) )
    {
        vlc_input_attachment_Delete( a );
        a = NULL;
    }
    return a;
}

static inline input_attachment_t *vlc_input_attachment_Duplicate( const input_attachment_t *a )
{
    return vlc_input_attachment_New( a->psz_name, a->psz_mime, a->psz_description,
                                     a->p_data, a->i_data );
}

/*****************************************************************************
 * input defines/constants.
 *****************************************************************************/

/**
 * This defines an opaque input resource handler.
 */
typedef struct input_resource_t input_resource_t;

/**
 * Main structure representing an input thread. This structure is mostly
 * private. The only public fields are read-only and constant.
 */
struct input_thread_t
{
    VLC_COMMON_MEMBERS
};

/**
 * Record prefix string.
 * TODO make it configurable.
 */
#define INPUT_RECORD_PREFIX "vlc-record-%Y-%m-%d-%Hh%Mm%Ss-$ N-$ p"

/*****************************************************************************
 * Input events and variables
 *****************************************************************************/

/**
 * \defgroup inputvariable Input variables
 *
 * The input provides multiples variable you can write to and/or read from.
 *
 * TODO complete the documentation.
 * The read only variables are:
 *  - "length"
 *  - "can-seek" (if you can seek, it doesn't say if 'bar display' has be shown
 *    or not, for that check position != 0.0)
 *  - "can-pause"
 *  - "can-rate"
 *  - "can-rewind"
 *  - "can-record" (if a stream can be recorded while playing)
 *  - "teletext-es" (list of id from the spu tracks (spu-es) that are teletext, the
 *                   variable value being the one currently selected, -1 if no teletext)
 *  - "signal-quality"
 *  - "signal-strength"
 *  - "program-scrambled" (if the current program is scrambled)
 *  - "cache" (level of data cached [0 .. 1])
 *
 * The read-write variables are:
 *  - state (\see input_state_e)
 *  - rate
 *  - position
 *  - time, time-offset
 *  - title, next-title, prev-title
 *  - chapter, next-chapter, next-chapter-prev
 *  - program, audio-es, video-es, spu-es
 *  - audio-delay, spu-delay
 *  - bookmark (bookmark list)
 *  - record
 *  - frame-next
 *  - navigation (list of "title %2i")
 *  - "title %2i"
 *
 * The variable used for event is
 *  - intf-event (\see input_event_type_e)
 */

/**
 * Input state
 *
 * This enum is used by the variable "state"
 */
typedef enum input_state_e
{
    INIT_S = 0,
    OPENING_S,
    PLAYING_S,
    PAUSE_S,
    END_S,
    ERROR_S,
} input_state_e;

/**
 * Input rate.
 *
 * It is an float used by the variable "rate" in the
 * range [INPUT_RATE_DEFAULT/INPUT_RATE_MAX, INPUT_RATE_DEFAULT/INPUT_RATE_MIN]
 * the default value being 1. It represents the ratio of playback speed to
 * nominal speed (bigger is faster).
 *
 * Internally, the rate is stored as a value in the range
 * [INPUT_RATE_MIN, INPUT_RATE_MAX].
 * internal rate = INPUT_RATE_DEFAULT / rate variable
 */

/**
 * Default rate value
 */
#define INPUT_RATE_DEFAULT  1000
/**
 * Minimal rate value
 */
#define INPUT_RATE_MIN        32            /* Up to 32/1 */
/**
 * Maximal rate value
 */
#define INPUT_RATE_MAX     32000            /* Up to 1/32 */

/**
 * Input events
 *
 * You can catch input event by adding a callback on the variable "intf-event".
 * This variable is an integer that will hold a input_event_type_e value.
 */
typedef enum input_event_type_e
{
    /* "state" has changed */
    INPUT_EVENT_STATE,
    /* b_dead is true */
    INPUT_EVENT_DEAD,

    /* "rate" has changed */
    INPUT_EVENT_RATE,

    /* At least one of "position" or "time" */
    INPUT_EVENT_POSITION,

    /* "length" has changed */
    INPUT_EVENT_LENGTH,

    /* A title has been added or removed or selected.
     * It implies that the chapter has changed (no chapter event is sent) */
    INPUT_EVENT_TITLE,
    /* A chapter has been added or removed or selected. */
    INPUT_EVENT_CHAPTER,

    /* A program ("program") has been added or removed or selected,
     * or "program-scrambled" has changed.*/
    INPUT_EVENT_PROGRAM,
    /* A ES has been added or removed or selected */
    INPUT_EVENT_ES,
    /* "teletext-es" has changed */
    INPUT_EVENT_TELETEXT,

    /* "record" has changed */
    INPUT_EVENT_RECORD,

    /* input_item_t media has changed */
    INPUT_EVENT_ITEM_META,
    /* input_item_t info has changed */
    INPUT_EVENT_ITEM_INFO,
    /* input_item_t name has changed */
    INPUT_EVENT_ITEM_NAME,
    /* input_item_t epg has changed */
    INPUT_EVENT_ITEM_EPG,

    /* Input statistics have been updated */
    INPUT_EVENT_STATISTICS,
    /* At least one of "signal-quality" or "signal-strength" has changed */
    INPUT_EVENT_SIGNAL,

    /* "audio-delay" has changed */
    INPUT_EVENT_AUDIO_DELAY,
    /* "spu-delay" has changed */
    INPUT_EVENT_SUBTITLE_DELAY,

    /* "bookmark" has changed */
    INPUT_EVENT_BOOKMARK,

    /* cache" has changed */
    INPUT_EVENT_CACHE,

    /* A audio_output_t object has been created/deleted by *the input* */
    INPUT_EVENT_AOUT,
    /* A vout_thread_t object has been created/deleted by *the input* */
    INPUT_EVENT_VOUT,

} input_event_type_e;

/**
 * Input queries
 */
enum input_query_e
{
    /* input variable "position" */
    INPUT_GET_POSITION,         /* arg1= double *       res=    */
    INPUT_SET_POSITION,         /* arg1= double         res=can fail    */

    /* input variable "length" */
    INPUT_GET_LENGTH,           /* arg1= int64_t *      res=can fail    */

    /* input variable "time" */
    INPUT_GET_TIME,             /* arg1= int64_t *      res=    */
    INPUT_SET_TIME,             /* arg1= int64_t        res=can fail    */

    /* input variable "rate" (nominal is INPUT_RATE_DEFAULT) */
    INPUT_GET_RATE,             /* arg1= int *          res=    */
    INPUT_SET_RATE,             /* arg1= int            res=can fail    */

    /* input variable "state" */
    INPUT_GET_STATE,            /* arg1= int *          res=    */
    INPUT_SET_STATE,            /* arg1= int            res=can fail    */

    /* input variable "audio-delay" and "sub-delay" */
    INPUT_GET_AUDIO_DELAY,      /* arg1 = int* res=can fail */
    INPUT_SET_AUDIO_DELAY,      /* arg1 = int  res=can fail */
    INPUT_GET_SPU_DELAY,        /* arg1 = int* res=can fail */
    INPUT_SET_SPU_DELAY,        /* arg1 = int  res=can fail */

    /* Menu (VCD/DVD/BD) Navigation */
    /** Activate the navigation item selected. res=can fail */
    INPUT_NAV_ACTIVATE,
    /** Use the up arrow to select a navigation item above. res=can fail */
    INPUT_NAV_UP,
    /** Use the down arrow to select a navigation item under. res=can fail */
    INPUT_NAV_DOWN,
    /** Use the left arrow to select a navigation item on the left. res=can fail */
    INPUT_NAV_LEFT,
    /** Use the right arrow to select a navigation item on the right. res=can fail */
    INPUT_NAV_RIGHT,
    /** Activate the popup Menu (for BD). res=can fail */
    INPUT_NAV_POPUP,
    /** Activate disc Root Menu. res=can fail */
    INPUT_NAV_MENU,

    /* Meta datas */
    INPUT_ADD_INFO,   /* arg1= char* arg2= char* arg3=...     res=can fail */
    INPUT_REPLACE_INFOS,/* arg1= info_category_t *            res=cannot fail */
    INPUT_MERGE_INFOS,/* arg1= info_category_t *              res=cannot fail */
    INPUT_GET_INFO,   /* arg1= char* arg2= char* arg3= char** res=can fail */
    INPUT_DEL_INFO,   /* arg1= char* arg2= char*              res=can fail */
    INPUT_SET_NAME,   /* arg1= char* res=can fail    */

    /* bookmarks */
    INPUT_GET_BOOKMARK,    /* arg1= seekpoint_t *               res=can fail */
    INPUT_GET_BOOKMARKS,   /* arg1= seekpoint_t *** arg2= int * res=can fail */
    INPUT_CLEAR_BOOKMARKS, /* res=can fail */
    INPUT_ADD_BOOKMARK,    /* arg1= seekpoint_t *  res=can fail   */
    INPUT_CHANGE_BOOKMARK, /* arg1= seekpoint_t * arg2= int * res=can fail   */
    INPUT_DEL_BOOKMARK,    /* arg1= seekpoint_t *  res=can fail   */
    INPUT_SET_BOOKMARK,    /* arg1= int  res=can fail    */

    /* titles */
    INPUT_GET_TITLE_INFO,     /* arg1=input_title_t** arg2= int * res=can fail */
    INPUT_GET_FULL_TITLE_INFO,     /* arg1=input_title_t*** arg2= int * res=can fail */

    /* seekpoints */
    INPUT_GET_SEEKPOINTS,  /* arg1=seekpoint_t*** arg2= int * res=can fail */

    /* Attachments */
    INPUT_GET_ATTACHMENTS, /* arg1=input_attachment_t***, arg2=int*  res=can fail */
    INPUT_GET_ATTACHMENT,  /* arg1=input_attachment_t**, arg2=char*  res=can fail */

    /* On the fly input slave */
    INPUT_ADD_SLAVE,       /* arg1= enum slave_type, arg2= const char *, arg3= bool */
    INPUT_ADD_SUBTITLE,    /* arg1= const char *, arg2=bool b_check_extension */

    /* On the fly record while playing */
    INPUT_SET_RECORD_STATE, /* arg1=bool    res=can fail */
    INPUT_GET_RECORD_STATE, /* arg1=bool*   res=can fail */

    /* ES */
    INPUT_RESTART_ES,       /* arg1=int (-AUDIO/VIDEO/SPU_ES for the whole category) */

    /* Viewpoint */
    INPUT_UPDATE_VIEWPOINT, /* arg1=(const vlc_viewpoint_t*), arg2=bool b_absolute */

    /* Input ressources
     * XXX You must call vlc_object_release as soon as possible */
    INPUT_GET_AOUT,         /* arg1=audio_output_t **              res=can fail */
    INPUT_GET_VOUTS,        /* arg1=vout_thread_t ***, size_t *        res=can fail */
    INPUT_GET_ES_OBJECTS,   /* arg1=int id, vlc_object_t **dec, vout_thread_t **, audio_output_t ** */

    /* External clock managments */
    INPUT_GET_PCR_SYSTEM,   /* arg1=mtime_t *, arg2=mtime_t *       res=can fail */
    INPUT_MODIFY_PCR_SYSTEM,/* arg1=int absolute, arg2=mtime_t      res=can fail */
};

/** @}*/

/*****************************************************************************
 * Prototypes
 *****************************************************************************/

VLC_API input_thread_t * input_Create( vlc_object_t *p_parent, input_item_t *, const char *psz_log, input_resource_t * ) VLC_USED;
#define input_Create(a,b,c,d) input_Create(VLC_OBJECT(a),b,c,d)

VLC_API int input_Start( input_thread_t * );

VLC_API void input_Stop( input_thread_t * );

VLC_API int input_Read( vlc_object_t *, input_item_t * );
#define input_Read(a,b) input_Read(VLC_OBJECT(a),b)

VLC_API int input_vaControl( input_thread_t *, int i_query, va_list  );

VLC_API int input_Control( input_thread_t *, int i_query, ...  );

VLC_API void input_Close( input_thread_t * );

/**
 * Create a new input_thread_t and start it.
 *
 * Provided for convenience.
 *
 * \see input_Create
 */
static inline
input_thread_t *input_CreateAndStart( vlc_object_t *parent,
                                      input_item_t *item, const char *log )
{
    input_thread_t *input = input_Create( parent, item, log, NULL );
    if( input != NULL && input_Start( input ) )
    {
        vlc_object_release( input );
        input = NULL;
    }
    return input;
}
#define input_CreateAndStart(a,b,c) input_CreateAndStart(VLC_OBJECT(a),b,c)

/**
 * Get the input item for an input thread
 *
 * You have to keep a reference to the input or to the input_item_t until
 * you do not need it anymore.
 */
VLC_API input_item_t* input_GetItem( input_thread_t * ) VLC_USED;

/**
 * It will return the current state of the input.
 * Provided for convenience.
 */
static inline input_state_e input_GetState( input_thread_t * p_input )
{
    input_state_e state = INIT_S;
    input_Control( p_input, INPUT_GET_STATE, &state );
    return state;
}

/**
 * Return one of the video output (if any). If possible, you should use
 * INPUT_GET_VOUTS directly and process _all_ video outputs instead.
 * @param p_input an input thread from which to get a video output
 * @return NULL on error, or a video output thread pointer (which needs to be
 * released with vlc_object_release()).
 */
static inline vout_thread_t *input_GetVout( input_thread_t *p_input )
{
     vout_thread_t **pp_vout, *p_vout;
     size_t i_vout;

     if( input_Control( p_input, INPUT_GET_VOUTS, &pp_vout, &i_vout ) )
         return NULL;

     for( size_t i = 1; i < i_vout; i++ )
         vlc_object_release( (vlc_object_t *)(pp_vout[i]) );

     p_vout = (i_vout >= 1) ? pp_vout[0] : NULL;
     free( pp_vout );
     return p_vout;
}

/**
 * It will add a new subtitle source to the input.
 * Provided for convenience.
 */
static inline int input_AddSubtitleOSD( input_thread_t *p_input, const char *psz_url,
        bool b_check_extension, bool b_osd )
{
    int i_result = input_Control( p_input, INPUT_ADD_SUBTITLE, psz_url, b_check_extension );
    if( i_result != VLC_SUCCESS || !b_osd )
        return i_result;

    vout_thread_t *p_vout = input_GetVout( p_input );
    if( p_vout )
    {
        vout_OSDMessage(p_vout, SPU_DEFAULT_CHANNEL, "%s",
                        vlc_gettext("Subtitle track added") );
        vlc_object_release( (vlc_object_t *)p_vout );
    }
    return i_result;
}
#define input_AddSubtitle(a, b, c) input_AddSubtitleOSD(a, b, c, false)

static inline int input_AddSlave( input_thread_t *p_input, enum slave_type type,
                                  const char *psz_uri, bool b_forced )
{
    return input_Control( p_input, INPUT_ADD_SLAVE, type, psz_uri, b_forced );
}

/**
 * Update the viewpoint of the input thread. The viewpoint will be applied to
 * all vouts and aouts.
 *
 * @param p_input an input thread 
 * @param p_viewpoint the viewpoint value
 * @param b_absolute if true replace the old viewpoint with the new one. If
 * false, increase/decrease it.
 * @return VLC_SUCCESS or a VLC error code
 */
static inline int input_UpdateViewpoint( input_thread_t *p_input,
                                         const vlc_viewpoint_t *p_viewpoint,
                                         bool b_absolute )
{
    return input_Control( p_input, INPUT_UPDATE_VIEWPOINT, p_viewpoint,
                          b_absolute );
}

/**
 * Return the audio output (if any) associated with an input.
 * @param p_input an input thread
 * @return NULL on error, or the audio output (which needs to be
 * released with vlc_object_release()).
 */
static inline audio_output_t *input_GetAout( input_thread_t *p_input )
{
     audio_output_t *p_aout;
     return input_Control( p_input, INPUT_GET_AOUT, &p_aout ) ? NULL : p_aout;
}

/**
 * Returns the objects associated to an ES.
 *
 * You must release all non NULL object using vlc_object_release.
 * You may set pointer of pointer to NULL to avoid retreiving it.
 */
static inline int input_GetEsObjects( input_thread_t *p_input, int i_id,
                                      vlc_object_t **pp_decoder,
                                      vout_thread_t **pp_vout, audio_output_t **pp_aout )
{
    return input_Control( p_input, INPUT_GET_ES_OBJECTS, i_id,
                          pp_decoder, pp_vout, pp_aout );
}

/**
 * \see input_clock_GetSystemOrigin
 */
static inline int input_GetPcrSystem( input_thread_t *p_input, mtime_t *pi_system, mtime_t *pi_delay )
{
    return input_Control( p_input, INPUT_GET_PCR_SYSTEM, pi_system, pi_delay );
}
/**
 * \see input_clock_ChangeSystemOrigin
 */
static inline int input_ModifyPcrSystem( input_thread_t *p_input, bool b_absolute, mtime_t i_system )
{
    return input_Control( p_input, INPUT_MODIFY_PCR_SYSTEM, b_absolute, i_system );
}

/* */
VLC_API decoder_t * input_DecoderCreate( vlc_object_t *, const es_format_t *, input_resource_t * ) VLC_USED;
VLC_API void input_DecoderDelete( decoder_t * );
VLC_API void input_DecoderDecode( decoder_t *, block_t *, bool b_do_pace );
VLC_API void input_DecoderDrain( decoder_t * );
VLC_API void input_DecoderFlush( decoder_t * );

/**
 * This function creates a sane filename path.
 */
VLC_API char * input_CreateFilename( input_thread_t *, const char *psz_path, const char *psz_prefix, const char *psz_extension ) VLC_USED;

/**
 * It creates an empty input resource handler.
 *
 * The given object MUST stay alive as long as the input_resource_t is
 * not deleted.
 */
VLC_API input_resource_t * input_resource_New( vlc_object_t * ) VLC_USED;

/**
 * It releases an input resource.
 */
VLC_API void input_resource_Release( input_resource_t * );

/**
 * Forcefully destroys the video output (e.g. when the playlist is stopped).
 */
VLC_API void input_resource_TerminateVout( input_resource_t * );

/**
 * This function releases all resources (object).
 */
VLC_API void input_resource_Terminate( input_resource_t * );

/**
 * \return the current audio output if any.
 * Use vlc_object_release() to drop the reference.
 */
VLC_API audio_output_t *input_resource_HoldAout( input_resource_t * );

/**
 * This function creates or recycles an audio output.
 */
VLC_API audio_output_t *input_resource_GetAout( input_resource_t * );

/**
 * This function retains or destroys an audio output.
 */
VLC_API void input_resource_PutAout( input_resource_t *, audio_output_t * );

/**
 * Prevents the existing audio output (if any) from being recycled.
 */
VLC_API void input_resource_ResetAout( input_resource_t * );

/** @} */
#endif