[Libva] Problem with HWDecode examples

[Varun Dua]

Hi All

I am using the hwdecode examples, they are building and running fine.

I changed the file ffmpeg_video.c to make it decode a video. Below is the
changed function that I am posting. The commented out portion is the
original code. I changed that to make it work for decoding a video but it is
giving a lot of artifacts.

Please tell me what needs to done. I am not changing the surface_id or the
context_id anywhere.

***********************************************
***********************************************
int decode(void)
{
    AVProbeData pd;
    ByteIOContext ioctx;
    AVInputFormat *format = NULL;
    AVFormatContext *ic = NULL;
    AVCodec *codec;
    AVCodecContext *avctx = NULL;
    AVPacket packet;
    AVStream *video_stream;
    int i, got_picture, error = -1;

    const uint8_t *video_data;
    unsigned int video_data_size;

    av_register_all();
    av_init_packet(&packet);

   /*codec_get_video_data(&video_data, &video_data_size);
    pd.filename = "";
    pd.buf      = (uint8_t *)video_data;
    pd.buf_size = MIN(video_data_size, 32*1024);
    if (FORCE_VIDEO_FORMAT)
        format = av_find_input_format(FORCE_VIDEO_FORMAT);
    if (format == NULL && (format = av_probe_input_format(&pd, 1)) == NULL)
        goto end;
    format->flags |= AVFMT_NOFILE;

    if (init_put_byte(&ioctx, (uint8_t *)video_data, video_data_size, 0,
NULL, NULL, NULL, NULL) < 0)
        goto end;

    if (av_open_input_stream(&ic, &ioctx, "", format, NULL) < 0)
        goto end;
*/
    av_open_input_file(&ic,"movies/high.mp4",NULL,0,NULL);
    if (av_find_stream_info(ic) < 0)
        goto end;
    dump_format(ic, 0, "", 0);

    video_stream = NULL;
    for (i = 0; i < ic->nb_streams; i++) {
        if (ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO &&
!video_stream)
            video_stream = ic->streams[i];
        else
            ic->streams[i]->discard = AVDISCARD_ALL;
    }
    if (video_stream == NULL)
        goto end;
    avctx = video_stream->codec;
    if (ffmpeg_init_context(avctx) < 0)
        goto end;

    if ((codec = avcodec_find_decoder(avctx->codec_id)) == NULL)
        goto end;
    if (avcodec_open(avctx, codec) < 0)
        goto end;

    got_picture = 0;
    while (av_read_frame(ic, &packet) == 0) {
        if (packet.stream_index != video_stream->index)
            continue;
        if ((got_picture = ffmpeg_decode(avctx, packet.data, packet.size)) <
0)
            goto end;
        /* read only one frame */
        if (got_picture) {
            error = 0;
        display();
            //break;
        }
    //av_free_packet()
    }
    /*if (!got_picture) {
        if ((got_picture = ffmpeg_decode(avctx, NULL, 0)) < 0)
            goto end;
        error = 0;
    }*/

end:
    av_free_packet(&packet);
    if (avctx)
        avcodec_close(avctx);
    if (ic)
        av_close_input_stream(ic);
    return error;
}
************************************************
************************************************

Thanks for your help
Regards
Varun Dua
Integ. M.Tech in Mathematics and Computing
Mathematics Department
IIT Delhi
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