jpg decode using vpudec ?

[alokkumar]

Dear all,

I searched the forum and found this question was asked earlier but no clear answer mentioned. Could someone from freescale tell how to decode jpeg using vpudec commandline or C code. I am it will be extremely useful for me and many more.

https://community.freescale.com/thread/304879

gst-launch filesrc location=./jeep.jpg ! vpudec ! imagefreeze ! mfw_isink axis

-top=540 axis-left=960 disp-width=960 disp-height=540

MFW_GST_ISINK_PLUGIN 3.0.5 build on Apr 17 2013 12:11:46.

Setting pipeline to PAUSED ...

[INFO]  Product Info: i.MX6Q/D/S

vpudec versions

        plugin: 3.0.5

        wrapper: 1.0.28(VPUWRAPPER_ARM_LINUX Build on Apr 17 2013 12:09:59)

        vpulib: 5.4.10

        firmware: 2.1.8.34588

Pipeline is PREROLLING ...

** (gst-launch-0.10:1255): CRITICAL **: gst_vpudec_chain: assertion `vpudec->context.handle' failed

When I tried same with jpgdec, CPU went upto 100% on one core. It does display image.

[jack_mao]

Hi Alok,

    There is some sample code I have done before for alsa sound , you could refer some part, by the way after use the gstreamer cmd , then use top command, after the picture displayed, the CPU load is very small, so I don't know how you test this, how and when?

	GstBus *bus;
	GstElement *pipeline;

	GstElement *alsasrc,*appsink;
	GstCaps *caps;
	buffer_in = (char*) malloc( BUF_SIZE1);
	buffer_out = (char*) malloc( BUF_SIZE2);

loop = g_main_loop_new(NULL,FALSE);

gst_init(NULL,NULL);

pipeline = gst_pipeline_new("test");

	alsasrc = gst_element_factory_make("alsasrc","alsasrc");
	appsink = gst_element_factory_make("appsink","appsink");

	bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
	gst_bus_add_watch (bus, bus_call, loop);

        gst_object_unref (bus);

//	g_object_set(G_OBJECT(alsasrc),"device","hw:0,0,0",NULL);

	caps = gst_caps_new_simple("audio/x-raw-int",
				"endianness",G_TYPE_INT,1234,
				"signed",G_TYPE_BOOLEAN,TRUE,
				"width",G_TYPE_INT,16,
				"depth",G_TYPE_INT,16,
				"rate",G_TYPE_INT,44100,
				"channels",G_TYPE_INT,2,
				NULL);
	gst_app_sink_set_caps((GstAppSink *)appsink,caps);

	g_object_set(G_OBJECT(appsink),"emit-signals",TRUE,NULL);
	g_signal_connect(appsink,"new-buffer",G_CALLBACK(on_new_buffer_from_source),NULL);

gst_bin_add_many(GST_BIN(pipeline),alsasrc,appsink,NULL);

	gst_element_link_many(alsasrc,appsink,NULL);
	asrc_fd = asrc_init_config();
	src = create_appsrc_pipeline();
	gst_element_set_state(pipeline,GST_STATE_PLAYING);
	g_main_loop_run(loop);

gst_element_set_state(pipeline,GST_STATE_NULL);

gst_object_unref(GST_OBJECT(pipeline));

[alokkumar]

Thanks Junping for sharing the code.

I am not sure if this code is any different than what I put earlier.

Actually so far I have been unsuccessful in using jpegdec without imagefreeze for jpeg display even using gst-launch.

any inputs will be helpful.

[LeonardoSandova · Accepted solution]

Hi Alok,

This pipeline works on my side and it is not using imagefreeze, the only problem is that display lasts for some milliseconds :smileyhappy:

VSALPHA=1 gst-launch filesrc location=sample.jpeg ! jpegdec ! mfw_isink

Leo

[joanxie]

it seems vpudec just can support mjpeg video, if one picture, need to use jpegdec.

[alokkumar]

With some reason I have been getting three issues with jpegdec

1. CPU utilization is very high, with 2 jpeg display it goes up to 100% on one core.

2. most of the jpeg files end up in source format error . Any suggestions how to play all jpeg files.

3. When I playing a picture I took from nokia lumia 920, it was split on the display. I was surprise to see that.

Any helping pointers are highly appreciated.

[LeonardoSandova]

Hi Alok.

Regarding 1, do you see the same behavior using gst-launch? It would be interesting to check which gst element is causing this high CPU usage, it may be the freeze element.

Regarding 2, It could be that those non-working jpegs have non-standard headers. Could you please post one of this to see the error/header?

Regarding 3, yes, This is a known issue. We are working on this.

Leo

[alokkumar]

Hi Leo,

1. I noticed that with gst-launch cpu load was almost 50% compare to C code(above). I was not sure why.

This was the original pipeline and after removing "imagefreeze" pipeline fails

gst-launch filesrc location=./jeep.jpg ! vpudec ! imagefreeze ! mfw_isink axis

-top=540 axis-left=960 disp-width=960 disp-height=540

I would be very interested to know if there is a way to do it without imagefreeze.

2. I am attaching jpeg file, which I could not play without aligning to 8 pixel boundary.

Thanks a lot

-Alok

[jack_mao]

1. CPU utilization is very high, with 2 jpeg display it goes up to 100% on one core.

the CPU usage should be high during a short period, because it's decode by software

2. most of the jpeg files end up in source format error . Any suggestions how to play all jpeg files.

didn't see that, could you check the your code according to the guide in this community

3. When I playing a picture I took from nokia lumia 920, it was split on the display. I was surprise to see that.

How large size is this picture?

[alokkumar]

Thanks Junping Mao.

1. cpu utilization remains high through out.

Please see the code and suggest if something is incorrect.

     GstBin *Bin;

      GstBus *bus;

      GMainLoop *Mainloop;

      gst_init (&argc,&argv);

      Mainloop = g_main_loop_new(NULL,FALSE);//NULL to use the current context and False to tell its not in running state

      GstElement *pipeline = gst_pipeline_new("PIPELINE");

      Bin = GST_BIN(pipeline);

      bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));

      source = gst_element_factory_make("filesrc","file-source");

      g_object_set(G_OBJECT(source),"location",argv[1],NULL);

      imagedecoder = gst_element_factory_make("jpegdec","decoder");

      imagefreeze = gst_element_factory_make("imagefreeze","imagefreeze");//"Vorbis audio decoder","vorbis");

      video_sink = gst_element_factory_make("mfw_isink","XV video sink ");

      int axis_top=0;

      int axis_left=0;

      int disp_width=1920;

      int disp_height=1080;

      g_object_set(G_OBJECT(video_sink),"axis-top",axis_top,"axis-left",axis_left,"disp-width",disp_width,"disp-height",disp_height,NULL);

      gst_bin_add(Bin,source);

      gst_bin_add_many(Bin,imagedecoder,imagefreeze,video_sink,NULL);

      gst_element_link(source,imagedecoder);

      gst_element_link(imagedecoder,imagefreeze);

      gst_element_link(imagefreeze,video_sink);

      gst_bus_add_watch(bus,process_message,Mainloop); //Mainloop is passed as user data as in the process_message actions are taken on the loop

      g_object_unref(bus);

      g_print("In playing state\n");

      gst_element_set_state(pipeline,GST_STATE_PLAYING);//Pipeline is also a bin and bin is also an element at abstract level and hence gst_element_set_state call is used to set state of pipeline.

      g_main_loop_run(Mainloop);

      g_print("In playing state2\n");

      gst_element_set_state(pipeline,GST_STATE_NULL);

      g_object_unref(G_OBJECT(pipeline));

    }

2. This problem was solved after making sure files are 8*8 pixel format.

3. I thing there is some issue with playing files bigger than 1080P.

Thanks

Alok

[jack_mao]

No, the vpudec doesn't support jpeg decode, you should use open source jpeg plugin, also in community has article to introduce how to enable the jpeg decode