Audio Handler callbacks not called while using capi

[aleitner]

I am currently working with the CEF capi and I am struggling with setting up the Audio Handler. Despite everything seeming correctly configured in my client, none of my Audio Handler callbacks are being called, so I'm unsure how to resolve this issue.

Here's a reduced version of my client implementation:

Code: Select all

//... Other code and includes here...

static cef_audio_handler_t* get_audio_handler(cef_client_t* self) {
    custom_client_t* custom_client = (custom_client_t*)self;
    return &custom_client->audio_handler->base;
}

custom_client_t *create_client() {
    custom_client_t *custom_client = (custom_client_t *)calloc(1, sizeof(custom_client_t));

    //... Assignments to other handlers here.

    custom_audio_handler_t* audio_handler = create_custom_audio_handler();
    custom_client->audio_handler = audio_handler;
    client->get_audio_handler = get_audio_handler;   

    return custom_client;
}


And here is the custom audio handler code

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void on_audio_stream_packet(struct _cef_audio_handler_t* self,
        struct _cef_browser_t* browser,
        const float** data,
        int frames,
        int64 pts) {
    fprintf(stderr, "Mmm\n");

void on_audio_stream_started(struct _cef_audio_handler_t* self,
        struct _cef_browser_t* browser,
        const cef_audio_parameters_t* params,
        int channels) {
    fprintf(stderr, "Hi\n");
}

void on_audio_stream_stopped(struct _cef_audio_handler_t* self,
        struct _cef_browser_t* browser) {
    fprintf(stderr, "Bye\n");
}

void on_audio_stream_error(struct _cef_audio_handler_t* self,
        struct _cef_browser_t* browser,
        const cef_string_t* message) {
    fprintf(stderr, "oops\n");
}

custom_audio_handler_t* create_custom_audio_handler() {
    custom_audio_handler_t* handler =
        (custom_audio_handler_t*)calloc(1, sizeof(custom_audio_handler_t));
   
    // Set the size of the base struct and setup the method handlers
    handler->base.base.size = sizeof(cef_audio_handler_t);
    handler->base.on_audio_stream_packet = on_audio_stream_packet;
    handler->base.on_audio_stream_started = on_audio_stream_started;
    handler->base.on_audio_stream_stopped = on_audio_stream_stopped;
    handler->base.on_audio_stream_error = on_audio_stream_error;
   
    fprintf(stderr, "Audio Handler created...\n");

    return handler;
}


I have ensured that the create_custom_audio_handler function is called and the custom_audio_handler_t is appropriately initialized. Despite this, when I play an audio source in the handled CEF browser, none of my callback functions (on_audio_stream_packet, on_audio_stream_started, on_audio_stream_stopped, or on_audio_stream_error) are being called.

Does anyone have any ideas why these callbacks are not being called, or how I can debug them effectively? Any help would be greatly appreciated.

[aleitner]

I found the solution. I needed to also set up an additional audio handler

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int get_audio_parameters(struct _cef_audio_handler_t* self,
                         struct _cef_browser_t* browser,
                         cef_audio_parameters_t* params) {
    /* Return value is expected to be a boolean (1 for success and 0 for failure) */
    return 1;
}


And then set this when initializing my handlers

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handler->base.get_audio_parameters = get_audio_parameters;