Hi,
august wrote
>
> I'm now trying to use gmerlin/encoder.h but am having some trouble.
>
>
> I do------------------------:
>
> int astream, vstream;
> bg_cfg_registry_t* config_reg;
> bg_plugin_registry_t* plugin_reg;
> char * tmp_path;
> bg_cfg_section_t * section;
> gavl_video_format_t vformat;
> gavl_audio_format_t aformat;
>
> bg_encoder_t * encoder;
>
>
> config_reg = bg_cfg_registry_create();
> tmp_path = bg_search_file_read("generic", "config.xml");
> bg_cfg_registry_load(config_reg, tmp_path);
>
> // How do I know what to load or look for here?
> section = bg_cfg_registry_find_section(config_reg, "plugins");
> plugin_reg = bg_plugin_registry_create(section);
> // I then create the encoder but don't know why I pass it plugin_reg or
> // section. What's the deal here?
You pass the plugin registry because the encoder needs to load plugins.
The section however will be *not* the same section you pass to the
plugin registry in bg_plugin_registry_create(). See below.
> encoder = bg_encoder_create( plugin_reg, section, NULL, 0, 0);
>
> // open it up
> if ( bg_encoder_open( encoder, "testvideo", NULL, NULL)) {
>
> // I then set up my aformat and vformat
>
> aformat.samples_per_frame = 256;
> aformat.samplerate = 48000;
> aformat.num_channels =2;
> aformat.sample_format = GAVL_SAMPLE_FLOAT ;
> aformat.interleave_mode= GAVL_INTERLEAVE_NONE;
> aformat.channel_locations[0] = GAVL_CHID_FRONT_LEFT;
> aformat.channel_locations[1] = GAVL_CHID_FRONT_RIGHT ;
>
> vformat.frame_width = 360;
> vformat.frame_height = 240;
> vformat.image_width = 360;
> vformat.image_height = 240;
> vformat.pixel_width = 1;
> vformat.pixel_height = 1;
> vformat.pixelformat = GAVL_RGB_24;
> vformat.frame_duration = 1001;
> vformat.timescale = 30000;
> vformat.framerate_mode = GAVL_FRAMERATE_CONSTANT;
> vformat.chroma_placement = GAVL_CHROMA_PLACEMENT_DEFAULT;
> vformat.interlace_mode=GAVL_INTERLACE_NONE;
> vformat.timecode_format.int_framerate=30;
>
> // then I add an audio stream, this seems to work
> printf("got here\n");
> astream = bg_encoder_add_audio_stream(encoder, NULL,
> &aformat, 0);
> printf("added astream %d\n", astream);
>
> // !!!!!!!!!!!!!!!!!!!!!!!!!!
> // IT CRASHES HERE BELOW. WHY?
> vstream = bg_encoder_add_video_stream(encoder, &vformat, 1);
> printf("added vstream %d\n", vstream);
>
> // Assuming I can get past this, what do I do next?
> // do I need to check the formats to see if they are the
> // same as what I passed to the encoder?
>
> bg_encoder_get_audio_format(encoder, astream, &checkaformat);
> bg_encoder_get_video_format(encoder, vstream, &checkvformat);
>
> // I assume I then start the encoder
> bg_encoder_start(encoder);
>
> // create frames and set up a while loop
> // to generate content for the audio-video frames
> // and then write them
> //int bg_encoder_write_audio_frame(bg_encoder_t *, gavl_audio_frame_t *
> frame, int stream);
> //int bg_encoder_write_video_frame(bg_encoder_t *, gavl_video_frame_t *
> frame, int stream);
>
> // What am I missing?
>
> }
>
> // destroy what I created
> bg_plugin_registry_destroy (plugin_reg);
> bg_cfg_registry_destroy( config_reg );
The creation of the encoder must be done differently:
First of all, you need to define, which streams and which encoder types
you want to support:
const int stream_mask = BG_STREAM_AUDIO | BG_STREAM_VIDEO;
const int plugin_mask = BG_PLUGIN_FILE /* | BG_PLUGIN_BROADCAST */;
Then you need to build the parameters, which describe this encoder setup:
bg_parameter_info_t * enc_parameters =
bg_plugin_registry_create_encoder_parameters(plugin_reg,
stream_mask,
plugin_mask);
Then you need a section, which contains the parameter values. The
parameter values are taken from what is saved in the config registry:
bg_cfg_section_t * encoder_section =
bg_encoder_section_get_from_registry(plugin_reg,
enc_parameters,
stream_mask,
plugin_mask);
Then you can create the encoder:
encoder = bg_encoder_create(plugin_reg,
encoder_section,
NULL,
stream_mask,
plugin_mask);
In theory you should then be able to set up the encoders with
gmerlin_plugincfg and your application will encode with these settings.
If you want to configure things from your application, you should
change the values in the encoder_section *before* you create the encoder.
Burkhard
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