Which gstreamer plug-in source code to reffer ?

[ssshukla26]

Hi, 

As you suggested I have done the following things, now it doesn't shows any
error but no output also ! 

1) I override *set_format* function as follows 

static gboolean *gst_myencoder_set_format* (GstVideoEncoder *encoder,
GstVideoCodecState *state)
{
    g_print("%s....................\n",__func__);
   
gst_video_encoder_set_output_state(encoder,gst_caps_new_empty_simple("video/x-raw"),state);
    return TRUE;
}

2) Added finishing of the "encoded" frames in *handle_frame* function as
follows 
static GstFlowReturn gst_myencoder_handle_frame (GstVideoEncoder
*encoder,GstVideoCodecFrame *frame)
{
    GstFlowReturn ret = GST_FLOW_OK;

    GstBuffer *input_buffer =  frame->input_buffer;
    GstMapInfo ip_info;
    g_print("%s....................\n",__func__);
    gst_buffer_map(input_buffer, &ip_info, GST_MAP_READ);
    if(ip_info.size <= 0)
    {   
        ret = GST_FLOW_EOS;
    }   
    else 
    {   
        GstBuffer *output_buffer =  frame->output_buffer;
        output_buffer = gst_buffer_new_allocate (NULL, ip_info.size, NULL);
        GstMapInfo op_info;
        gst_buffer_map(output_buffer, &op_info, GST_MAP_WRITE);
        memcpy(op_info.data,ip_info.data,ip_info.size);
        gst_buffer_unmap(output_buffer, &op_info);
    }   
    gst_buffer_unmap(input_buffer, &ip_info);

    *
    if(ret != GST_FLOW_EOS)
    {   
        ret = gst_video_encoder_finish_frame (encoder,frame);
    }   
    *

    return ret;
}

By executing a pipeline as follows it doesn't show any error but I am not
getting any output on video sink.

*gst-plugin$ gst-launch-1.0 videotestsrc !
video/x-raw,width=640,height=480,framerate=30/1 ! myh264encoder ! videoparse
width=640 height=480 framerate=30/1 !  autovideoconvert  ! autovideosink
*

Setting pipeline to PAUSED ...
libva info: VA-API version 0.35.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
libva info: VA-API version 0.35.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
libva info: VA-API version 0.35.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
gst_myencoder_open....................
gst_myencoder_start....................
Pipeline is PREROLLING ...
gst_myencoder_set_format....................
gst_myencoder_handle_frame....................
gst_myencoder_handle_frame....................
gst_myencoder_handle_frame....................
.
.
.
gst_myencoder_handle_frame....................
^Chandling interrupt.
Interrupt: Stopping pipeline ...
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
gst_myencoder_stop....................
gst_myencoder_close....................
Freeing pipeline ...


Please help me out to identify what am missing and what am doing wrong !



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