Frame API NV12 AVFrame (FFmpeg) camera

I'm trying to use the camera API to stream video, but since it currently only writes to a file I'm trying to use the callback with the video viewfinder.

void vf_callback(camera_handle_t handle, camera_buffer_t* buf, void* arg)

Given that it only becomes a video image in NV12 (close enough to YUV420P? I think?) I'm trying to use FFmpeg to convert. I already wore FFmpeg and it works fine, but I can't seem to get the image to convert on one MPEG frame.

My question is, does anyone know how to code the video image of the reminder using FFmpeg?

What makes a dummy AVFrame which works well when the video file is created:

/* Y */
for(int y=0;yheight;y++) {
    for(int x=0;xwidth;x++) {
        picture->data[0][y * picture->linesize[0] + x] = x + y + a * 3;
    }
}

/* Cb and Cr */
for(int y=0;yheight/2;y++) {
    for(int x=0;xwidth/2;x++) {
        picture->data[1][y * picture->linesize[1] + x] = 128 + y + a * 2;
        picture->data[2][y * picture->linesize[2] + x] = 64 + x + a * 5;
    }
}

I found this in the FFmpeg source, but it does not quite work to convert the image:

int8_t *y, *u, *v;
y = picture->data[0];
u = picture->data[1];
v = picture->data[2];
const uint8_t *src=buf->framebuf;

for (int i = 0; i < (c->height + 1) >> 1; i++)
{
    for (int j = 0; j < (c->width + 1) >> 1; j++)
    {
        u[j] = *src++ ^ 0x80;
        v[j] = *src++ ^ 0x80;
        y[2 * j] = *src++;
        y[2 * j + 1] = *src++;
        y[picture->linesize[0] + 2 * j] = *src++;
        y[picture->linesize[0] + 2 * j + 1] = *src++;
    }

    y += 2 * picture->linesize[0];
    u += picture->linesize[1];
    v += picture->linesize[2];
}

Here is the reminder and any other test code:

void vf_callback(camera_handle_t handle, camera_buffer_t* buf, void* arg)
{
    if (buf->frametype != CAMERA_FRAMETYPE_NV12)
    {
        return;
    }

    printf("got video buffer of size %d x %d, bytes: %d\n",
            buf->framedesc.nv12.width, buf->framedesc.nv12.height,
            (buf->framedesc.nv12.height + (buf->framedesc.nv12.height / 2))
                    * buf->framedesc.nv12.stride);

    av_register_all();

    video_encode_example(buf, "/accounts/1000/shared/camera/VID_TEST.mpg",
            CODEC_ID_MPEG1VIDEO);
}

void video_encode_example(camera_buffer_t* buf, const char *filename,
        enum CodecID codec_id)
{
    AVCodec *codec;
    AVCodecContext *c = NULL;
    int out_size, outbuf_size;
    FILE *f;
    AVFrame *picture;
    uint8_t *outbuf;
    int had_output = 0;

    printf("Encode video file %s\n", filename);

    /* find the mpeg1 video encoder */
    codec = avcodec_find_encoder(codec_id);
    if (!codec)
    {
        fprintf(stderr, "codec not found\n");
        exit(1);
    }

    c = avcodec_alloc_context3(codec);
    picture = avcodec_alloc_frame();

    /* put sample parameters */
    c->bit_rate = 400000;
    /* resolution must be a multiple of two */
//    c->width = buf->framedesc.nv12.width;
//    c->height = buf->framedesc.nv12.height;
    c->width = 352;
    c->height = 288;
    /* frames per second */
    c->time_base = (AVRational)
    {   1,25};
    c->gop_size = 10; /* emit one intra frame every ten frames */
    c->max_b_frames = 1;
    c->pix_fmt = PIX_FMT_YUV420P;

//    if(codec_id == CODEC_ID_H264)
//        av_opt_set(c->priv_data, "preset", "slow", 0);

    /* open it */
    if (avcodec_open2(c, codec, NULL) < 0)
    {
        fprintf(stderr, "could not open codec\n");
        exit(1);
    }

    f = fopen(filename, "wb");
    if (!f)
    {
        fprintf(stderr, "could not open %s\n", filename);
        exit(1);
    }

        /* alloc image and output buffer */
    outbuf_size = 100000 + 12 * c->width * c->height;
    outbuf = (uint8_t *) malloc(outbuf_size);

    /* the image can be allocated by any means and av_image_alloc() is
     * just the most convenient way if av_malloc() is to be used */
    av_image_alloc(picture->data, picture->linesize, c->width, c->height,
            c->pix_fmt, 1);

    /* encode 1 second of video */
    int a = 0;
    for (; a < 15; a++)
    {
//      fflush(stdout);

        /* Y */
        for(int y=0;yheight;y++) {
            for(int x=0;xwidth;x++) {
                picture->data[0][y * picture->linesize[0] + x] = x + y + a * 3;
            }
        }

        /* Cb and Cr */
        for(int y=0;yheight/2;y++) {
            for(int x=0;xwidth/2;x++) {
                picture->data[1][y * picture->linesize[1] + x] = 128 + y + a * 2;
                picture->data[2][y * picture->linesize[2] + x] = 64 + x + a * 5;
            }
        }

//      uint8_t *y, *u, *v;
//      y = picture->data[0];
//      u = picture->data[1];
//      v = picture->data[2];
//      const uint8_t *src=buf->framebuf;
//
//      for (int i = 0; i < (c->height + 1) >> 1; i++)
//      {
//          for (int j = 0; j < (c->width + 1) >> 1; j++)
//          {
//              u[j] = *src++ ^ 0x80;
//              v[j] = *src++ ^ 0x80;
//              y[2 * j] = *src++;
//              y[2 * j + 1] = *src++;
//              y[picture->linesize[0] + 2 * j] = *src++;
//              y[picture->linesize[0] + 2 * j + 1] = *src++;
//          }
//
//          y += 2 * picture->linesize[0];
//          u += picture->linesize[1];
//          v += picture->linesize[2];
//      }

        struct SwsContext* fooContext = sws_getContext(c->width, c->height,
                PIX_FMT_YUV420P, c->width, c->height, PIX_FMT_RGB8,
                SWS_FAST_BILINEAR, NULL, NULL, NULL);

        AVFrame* outpic = avcodec_alloc_frame();
        av_image_alloc(outpic->data, outpic->linesize, c->width, c->height,
                PIX_FMT_RGB8, 1);

        sws_scale(fooContext, picture->data, picture->linesize, 0, c->height,
                outpic->data, outpic->linesize);

        /* encode the image */
        out_size = avcodec_encode_video(c, outbuf, outbuf_size, outpic);
        had_output |= out_size;
        printf("encoding frame %3d (size=%5d)\n", a, out_size);
        fwrite(outbuf, 1, out_size, f);
    }

    /* get the delayed frames */
    for (; out_size || !had_output; a++)
    {
        fflush(stdout);

        out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
        had_output |= out_size;
        printf("write frame %3d (size=%5d)\n", a, out_size);
        fwrite(outbuf, 1, out_size, f);
    }

        /* add sequence end code to have a real mpeg file */
    outbuf[0] = 0x00;
    outbuf[1] = 0x00;
    outbuf[2] = 0x01;
    outbuf[3] = 0xb7;
    fwrite(outbuf, 1, 4, f);
    fclose(f);
    free(outbuf);

    avcodec_close(c);
    av_free(c);
    av_free(picture->data[0]);
    av_free(picture);
    printf("\n");
}

I use this with sample HelloVideoCamera, so if you want to run it, you can plug the recall on that.

So I did a bit of preliminary inquiry and it seems that the following fields of the struct AVFrame interest a NV12-> YUV420P conversion:

uint8_t* data[];
uint8_t linesize[];
int width;
int height;

It seems that in the case of YUV420P, data [0] is a pointer to the pixel plan Y data [1] are a pointer to pixel map U and data [2] is a pointer to the plan V pixel.

You will notice that in the NV12 format, there are only 2 planes: a plan of Y and a plan combined UV. The trick in this conversion process will be out interlacing the you and values V of the UV combined plan separate from you and V aircraft.

The plan should be usable as - is. You shouldn't even need to copy the pixel data.

picture->data[0] = buf->framebuf;
picture->linesize[0] = buf->framedesc.nv12.stride;

The code above should be enough to put the plan in place Y. If you really want, you could malloc air pixel data [0] and then memcpy() the Y data buf-> framebuf (line-by-line!), but it's probably a waste of time. I noticed that you use av_image_alloc(), which you probably want to skip since you probably only want alloc data [1] and [2] data plans and will probably have to do it by hand... you can consider to implement a pool rather than return to malloc() in real-time.

In any case, once you have the data [1] and would have [2] data had malloc (), you should be able to make an of interleave and copy from you and data buffer V of NV12 as follows:

uint8_t* srcuv = &buf->framebuf[buf->framedesc.nv12.uv_offset];
uint8_t* destu = picture->data[1];
uint8_t* destv = picture->data[2];
picture->linesize[1] = buf->framedesc.nv12.width / 2;picture->linesize[2] = picture->linesize[1];

for (i=0; iframedesc.nv12.height/2; i++) {
    uint8_t* curuv = srcuv;
    for (j=0; iframedesc.nv12.width/2; j++) {
        *destu++ = *curuv++;
        *destv++ = *curuv++;
    }
    srcuv += buf->framedesc.nv12.stride; // uv_stride in later API versions
}

Note I guess one of strides you and plan V is desirable. Then, if your allocator data [1] and [2] data plans with long strides, "Stride" pointers of dest as necessary at the end of the loop 'j '.

Now you should have a YUV420P frame that will be compatible with your encoder. Or at least that's how to interpret headers no matter what I was watching

See you soon,.

Sean

Tags: BlackBerry Developers

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< 240="">

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aaOr rrDP
ddFi IPI
7 -low priority
. -SOF will have the value 1 in the LabView by ORing program 0x20000000

.. C2 -194 - PF
Group of settings label: report of Performance Monitor
PGN Desc. :
Specify the legislative requirements of OBD
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I put in place of the test data

| LS MS | LS MS | LSD MSD | LS MS | LS MS |
| F4 01 | 0A 00 | 8 D F8 02 | 14 00 | 0A 00 |

who is for
----------- ------- ----------------------------------------------
SPN
Position
in
PGN SPN SPN Description
----------- ------- ----------------------------------------------
01-02 3048 engine cycles counter
03-04 3049 control of the Conditions encountered
05-06, 7.6 3066 SPN of the Applicable System Monitor
08-09 3067 numerator applicable system monitor
10-11 3068 denominator applicable system monitor
----------- ------- ----------------------------------------------

If you reverse the LSD and the MSD around you get this:
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| LS MS | MS LS | MSD LSD | MS LS | MS LS |
| F4 01 | 0A 00 | F8 02 8 D | 00 14 | 0A 00 |

01 F4 -online 500
Engine ignition cycles counter

0a 00 => 10
Terms of OBD monitoring
Met
F8 8 02
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00028D -online 653
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Applicable system monitor
Numerator
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Denominator

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This load in LabView

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Here is the output of debugging with my comments (CMT :)
-------------------------------------------------------------------
CMT: EC message with 0 x 02000000 ORed SOF in LabVIEW
CMT: and the priority changed shape 05:53 (110)
CMT: do 38
CMT: 0011 1000
CMT: PAPP DETERIORATED
CMT: aaOr rrDP
CMT: ddFi IPI
CMT: 1 priority 10-6

CMT: EC - Transport Protocol - connection Mgmt.
CMT: BB - DA (Destination address)
CMT: AA - SA (Source address)

SAM: 10-16, RTS Message
CMT: 0 b 00-11 my size
CMT: 02 NumPackets
CMT: MaxNumPackets FF-255
CMT:-00C2BB PGN BB C2 00
CMT:
CMT:
CMT:

c 10:32:51.548 38ECBBAA CAN data frame C2 of BB FF 02 00 00 0b 08:10
iMessageDataSize =: 0:
RTS beginning: 10: (10 - RTS)
RTS my size: 000 b: (11)
RTS Num Pack: 02: (2)
RTS Max Num Pack: FF: (255)
RTS PGN: 00C2BB:

CMT: Here's the CTS to send the data that I created to send with ncWrite
CMT: 11 - fixed 17, message EC PGN 60416
CMT: 02 - maximum number of packets that can be sent
CMT: 01 - next to use sequence number
CMT: FF FF - reserved. Filled with FFs
CMT: BB C2 00 - 00C2BB PGN

.... In SendCTS...
iBAMRTSCAMPgn =: 00C2BB:

/Ucdata CTS [0] =: 11:
CTS /ucdata [1] =: 02:
CTS /ucdata [2] =: 01:
CTS /ucdata [3] =: FF:
CTS /ucdata [4] =: FF:
CTS /ucdata [5] =: BB:
CTS /ucdata [6] =: C2:
CTS /ucdata [7] =: 00:

ActualDataSize =: 1:

CMT: I have more a data message "EB00" or "38EBBBAA" but I
CMT: get '38ECBBAA' with 'FF' in the 1 byte of data, which means
CMT: "Connection Abort Message.

iPri =: 6:
iEdpDp =: 0:
iPf =: EC:
iPs =: BB:
iGe =: 00:
Fnpi =: EC00:
iSa =: AA:
c 10:32:52.799 38ECBBAA CAN data frame 8: FF FF FF FF FF BB C2 00
iMessageDataSize =: 0:

I've corrected the program.

It was the following statement:

was as follows:

Status =
() ncWrite
gNetIntfObjhRx,
oCFSend.DataLength,
(void *) & oCFSend
);

should be this:

Status =
() ncWrite
gNetIntfObjhRx,
sizeof (oCFSend),
(void *) & oCFSend
);

Message data CAN be read with more 64-bit

Dear all,

I work with CAN PCI card series 2 with Labview 8.2.1 measurement and automation 5.1.

I do the measures since an ECU.

This one (please see piture) comprises more than 64 bits for one ID.

I cannot find how I can read these data using 'Channel API'. Is this possible?

On MAX, I am not able creat CAN measure with more than 64-bit task...

It is necessary to use only "frame APIs.

Thanks for repply.

Concerning

NI-Channel CAN API is not able to deal with Multi part messages, so you must use the NI-CAN frame API to read the Multi part message and do the conversion to physical quantities on your own.

CAN read data using NI-XNET

I was playing around with the new NI XNET drivers read CAN data and I need some experts advise on this topic. In the frame API, I remember to be able to check that if there is data on the queue of read before reading, with Xnet, I have not found this option. XNET use playback function that will read the entire queue without worrying if the data is present.

This causes me a problem, because I'm constantly calling loop playback function, the data are written to a table of images, then the table will be empty for the next iteration because the reading queue was empty during the second reading.

How can I continually read data from the queue of reading without accidental my output table?

I tried the survey/Deque method, but it works well for me. Is someone can you please tell me what is the best practice for continuously reading the CAN data and treatment using drivers XNET?

Thank you

Sam

Looks like you want to use with your berries shift registers. Discover this Subvi, which is part of the expedition OR XNET examples. You can find examples from the Finder example under help > find examples.

Apart from converting it the image into a string, the additions loop the string to an array and use the shift registers to pass the array in the iterations of the loop.

Is that what you're looking for?

Frame API NV12 AVFrame (FFmpeg) camera

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