Gstreamer-1.0 Buffer Injection problem

Shylesh S

Hi,

I previously used Gstreamer-0.10, in which I read a video file using fread() system call. The read file is buffer injected in the following method, where u8TxBuf has the file read output. This method of using fread() is because of the need to transport the video packets through the socket from one node to the other.

Code in GStreamer-0.10:

            VideoOutputPointer = g_malloc(1316);
           memcpy(VideoOutputPointer,&u8TxBuf,1316);
           sample_cnt=0;
           InjectionBuffer = gst_buffer_new();
           GST_BUFFER_MALLOCDATA(InjectionBuffer) = VideoOutputPointer;
           GST_BUFFER_SIZE(InjectionBuffer)       = 1316;
           GST_BUFFER_DATA(InjectionBuffer)       = VideoOutputPointer;
           ret = gst_app_src_push_buffer(Access2Player->StreamSource, InjectionBuffer);

The Red Highlighted lines are some changes when we shift to Gstreamer-1.0. Errors were thrown at the time of compiling. Now, I changed this portion of code in the following manner.

Code in Gstreamer-1.0:

VideoOutputPointer = g_malloc(1316);
                        memcpy(VideoOutputPointer,&u8TxBuf,1316);
                        sample_cnt=0;
                        InjectionBuffer = gst_buffer_new();

                        mem = gst_allocator_alloc (NULL, 1316, NULL);
                        gst_buffer_insert_memory (InjectionBuffer, -1, mem);
                        gst_memory_map (mem, &info, GST_MAP_WRITE);
                        for(i=0;i<info.size; i++)
                             {
                                info.data= ptr[i];
                             }
                        ret = gst_app_src_push_buffer(Access2Player->StreamSource, InjectionBuffer);

I have modified my code in this way. I see that info.size returns my desired 1316 bytes and the gst_app_src_push_buffer() succeeds. But the Dynamic padding process next to buffer injection doesn't happen because of some reasons like unavailability of data or wrong data.

Kindly someone help me in solving this issue.

Thanks & Regards,

Shylesh S.

over 9 years ago

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,

Could you share which device is this? Also which linux distro are you using?

Best Regards,
Yordan

0 Margarita Gashova over 9 years ago

TI__Guru* 80190 points

Hello,

In the guide for 1.0 this is how to create a buffer:
GstBuffer *buffer;
GstMemory *memory;
gint size, width, height, bpp;
...
size = width * height * bpp;
buffer = gst_buffer_new ();
memory = gst_allocator_alloc (NULL, size, NULL);
gst_buffer_insert_memory (buffer, -1, memory);
...
developer.gnome.org/.../gstreamer-GstBuffer.html
developer.gnome.org/.../gstreamer-GstMemory.html

I would recommend you to read the Description below example 3.

Hope this helps.
BR
Margarita

0 Shylesh S over 9 years ago in reply to Yordan Kovachev

Intellectual 755 points

Hello Yordan,
I use Vayu EVM J6 and Ubuntu 12.04. Even when I compile the code using gcc, I get this problem. This is because of the changes that has been caused because of the Gstreamer-1.0 up gradation.

Thanks,
Shylesh S.

0 Shylesh S over 9 years ago in reply to Margarita Gashova

Intellectual 755 points

Hello Margarita,

I could find only the details about how to create a buffer. But, I am looking for an answer that helps me to copy the file read data into the GstBuffer. The old APIs directly does the copying of the file read buffer to the GstBuffer. I couldn't find an alternate solution in Gstreamer-1.0 version, to copy the video data from the buffer in which the file reading is performed using fread().

Kindly help me out.
Warm Regards,
Shylesh S.

0 Margarita Gashova over 9 years ago in reply to Shylesh S

TI__Guru* 80190 points

Hello,

If I understand you right you are searching for something like:

#define BUF_SIZE (xx*xxxx)

do {
GstMapInfo map;
GstBuffer *buf;
size_t ret;

buf = gst_buffer_new_allocate (NULL, BUF_SIZE, NULL);
gst_buffer_map (buf, &map, GST_MAP_WRITE);
ret = fread (map.data, 1, map.size, data1.file);
gst_buffer_unmap (buf, &map);
if (ret > 0) {
gst_buffer_resize (buf, ret);
... push buffer into appsrc...
} else {
gst_buffer_unref (buf);
}
} while (!feof (data1.file) && !ferror (data1.file));

BR
Margarita

0 Prabhakar Lad over 9 years ago

Guru 11260 points

Hello,

Not sure why are you re-inventing the wheel when you already have filesrc[1]/fdsrc [2]/multifilesrc[3] element in gstreamer.

[1] gstreamer.freedesktop.org/.../gstreamer-plugins-filesrc.html
[2] gstreamer.freedesktop.org/.../gstreamer-plugins-fdsrc.html
[3] gstreamer.freedesktop.org/.../gst-plugins-good-plugins-multifilesrc.html

Cheers,
--Prabhakar Lad

0 Shylesh S over 9 years ago in reply to Margarita Gashova

Intellectual 755 points

Hello Margarita,

Thanks a lot. The Issue is fixed now.
I just implemented this way of buffer injection in my code.
Though I faced some issues, I managed to solve them all.

Thank you very much for your support.
Best Regards,
Shylesh S.

0 Shylesh S over 9 years ago in reply to Prabhakar Lad

Intellectual 755 points

Hello Prabhakar,

Thank you for the reply.
I will look into it.

Warm Regards,
Shylesh S.

0 Margarita Gashova over 9 years ago in reply to Shylesh S

TI__Guru* 80190 points

Hello Shylesh,

I am glad that this issue is resolved.
Let us know for further questions.

BR
Margarita

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Gstreamer-1.0 Buffer Injection problem