Question

I am creating android application that uses libvlc to play a video.
Since vlc/libvlc doesnt have any kind of event/callback for subtitles i have created my own text renderer module in modules/text_rendere/spucallback

Module compiles, but i have two problems.:

I dont see any log messages from this module
How can i use this module from libvlc

callback.h

typedef void (*spu_cb_t)(text_segment_t *p_segment);

struct spu_cb_t {
    spu_cb_t cb;
};

struct spu_cb_t *callback;

callback.c

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdlib.h>
/* VLC core API headers */
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_interface.h>
#include <vlc_filter.h>
#include "callback.h"

static int Open(vlc_object_t *);
static void Close(vlc_object_t *);
static int RenderText(filter_t *,
                  subpicture_region_t *p_region_out,
                  subpicture_region_t *p_region_in,
                  const vlc_fourcc_t *p_chroma_list);

/* Module descriptor */
vlc_module_begin()
    set_shortname(N_("SPU Callback "))
    set_description(N_("SPU Callback module"))
    set_capability("text renderer", 0)
    set_callbacks(Open, Close)
    set_category(CAT_VIDEO)
vlc_module_end ()

static int Open(vlc_object_t *p_this)
{
    filter_t *p_filter = (filter_t *)p_this;
    p_filter->pf_render = RenderText;

    printf("spucallback:Open");

    callback = (spu_cb_t*) malloc(sizeof(spu_cb_t));
    if (!callback)
        goto error;

    return VLC_SUCCESS;  

error:
    free(callback);
    return VLC_EGENERIC; 
}

static void Close(vlc_object_t *p_this)
{
    printf("spucallback:Close");

    free(callback->cb);
    free(callback);
}

static int RenderText(filter_t *p_filter,
    subpicture_region_t *p_region_out,
    subpicture_region_t *p_region_in,
    const vlc_fourcc_t *p_chroma_list)
{
    text_segment_t *p_segment = p_region_in->p_text;
    callback->cb(p_segment);
    printf("spucallback:RenderText");

    return VLC_SUCCESS;
}

Code is not yet finished obviously

This log messages might be related:

[e41bfa2c] core spu text: looking for text renderer module matching "spucallback": 1 candidates
[e41bfa2c] core spu text: no suitable access module for `file:///vendor/etc/fallback_fonts.xml'
[e41bfa2c] core spu text: using text renderer module "freetype"

vlc/libvlc - how to get a reference to a custom vlc module

0 个答案: