Hi,
august wrote:
> Burkhard,
>
> Thanks for your patience so far. I hope this is helpful for us
> both.
It is.
>
> Instead of getting the plugin like you suggested, I get it by name::
>
> info = bg_plugin_find_by_name(plug_reg, "e_ffmpeg");
>
That's completely ok, if you are prepared for the case, that the e_ffmpeg
plugin is missing....
> I then set up the handle like you say.
>
>> bg_plugin_handle_t * h;
>>
>> bg_encoder_plugin_t * plugin; // Contains function pointers for encoding
>>
>> h = bg_plugin_load(plugin_reg, info);
>>
>> /* h->plugin is of type bg_plugin_common_t, so we must cast it */
>> plugin = (bg_encoder_plugin_t*)(h->plugin);
>>
>> Then you can call the encoding functions with h->priv as first argument.
>
>
> Now, I am wondering how I read and set the parameters for a particular
> codec. I do:
>
> const bg_parameter_info_t * params;
> params = plugin->get_audio_parameters(h->priv);
> printf("param name: %s longname:%s opt:%s help_string:%s \n",
> params->name, params->long_name, params->opt,
> params->help_string);
>
> But, this only prints out: "param name: codec longname:Codec ..."
>
>
> How do I loop through the parameters of a given codec and get/set them?
First of all: Looping through a parameter array happens with
i = 0;
while(params[i].name)
{
/* do something */
i++;
}
In this case, params is of type BG_PARAMETER_MULTI_MENU.
Then, the following additional members are set:
char ** multi_names; /* Short name for each codec (to be passed via
set_parameter())
char ** multi_labels; /* Human readable and translatable name for each
codec */
char ** multi_descriptions; /* Description for each codec */
bg_parameter_info_t ** multi_parameters; /* Parameters for each codec */
Looping through all possible menuitems (i.e. codecs) happens with:
j = 0;
while(params[i].multi_names[j])
{
/* do something */
j++;
}
Note that some codecs might have no parameters. In that case
multi_parameters[k] == NULL.
Getting parameter values from the plugin is not possible, but the val_default
member of
the parameter info contains a sensible default.
Setting the parameters is easy: First set the "codec" parameter (codec name as
string).
Then, set all parameters for that codec.
Also important is the following: plugins or other modules *never* set their
parameters
to defaults automatically. They just tell the defaults they like via
val_default.
For the general plugin parameters, the plugin registry takes care of it. For
the per stream
parameters (set_[audio|video]_parameter()), you have to do it.
I.e. if you don't set the audio codec, it will be NULL and plugin will crash :)
If you don't set the bitrate it will also be 0.
Burkhard
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